move alsa and oss modules into their own subdirectories

4 files changed, 4524 insertions, 0 deletions

diff --git a/src/modules/alsa/alsa-util.c b/src/modules/alsa/alsa-util.c
new file mode 100644
index 00000000..ff3af19d
--- /dev/null
+++ b/src/modules/alsa/alsa-util.c
@@ -0,0 +1,1261 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <limits.h>
+#include <asoundlib.h>
+
+#include <pulse/sample.h>
+#include <pulse/xmalloc.h>
+#include <pulse/timeval.h>
+
+#include <pulsecore/log.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/atomic.h>
+
+#include "alsa-util.h"
+
+struct pa_alsa_fdlist {
+    unsigned num_fds;
+    struct pollfd *fds;
+    /* This is a temporary buffer used to avoid lots of mallocs */
+    struct pollfd *work_fds;
+
+    snd_mixer_t *mixer;
+
+    pa_mainloop_api *m;
+    pa_defer_event *defer;
+    pa_io_event **ios;
+
+    pa_bool_t polled;
+
+    void (*cb)(void *userdata);
+    void *userdata;
+};
+
+static void io_cb(pa_mainloop_api*a, pa_io_event* e, int fd, pa_io_event_flags_t events, void *userdata) {
+
+    struct pa_alsa_fdlist *fdl = userdata;
+    int err;
+    unsigned i;
+    unsigned short revents;
+
+    pa_assert(a);
+    pa_assert(fdl);
+    pa_assert(fdl->mixer);
+    pa_assert(fdl->fds);
+    pa_assert(fdl->work_fds);
+
+    if (fdl->polled)
+        return;
+
+    fdl->polled = TRUE;
+
+    memcpy(fdl->work_fds, fdl->fds, sizeof(struct pollfd) * fdl->num_fds);
+
+    for (i = 0; i < fdl->num_fds; i++) {
+        if (e == fdl->ios[i]) {
+            if (events & PA_IO_EVENT_INPUT)
+                fdl->work_fds[i].revents |= POLLIN;
+            if (events & PA_IO_EVENT_OUTPUT)
+                fdl->work_fds[i].revents |= POLLOUT;
+            if (events & PA_IO_EVENT_ERROR)
+                fdl->work_fds[i].revents |= POLLERR;
+            if (events & PA_IO_EVENT_HANGUP)
+                fdl->work_fds[i].revents |= POLLHUP;
+            break;
+        }
+    }
+
+    pa_assert(i != fdl->num_fds);
+
+    if ((err = snd_mixer_poll_descriptors_revents(fdl->mixer, fdl->work_fds, fdl->num_fds, &revents)) < 0) {
+        pa_log_error("Unable to get poll revent: %s", snd_strerror(err));
+        return;
+    }
+
+    a->defer_enable(fdl->defer, 1);
+
+    if (revents)
+        snd_mixer_handle_events(fdl->mixer);
+}
+
+static void defer_cb(pa_mainloop_api*a, pa_defer_event* e, void *userdata) {
+    struct pa_alsa_fdlist *fdl = userdata;
+    unsigned num_fds, i;
+    int err;
+    struct pollfd *temp;
+
+    pa_assert(a);
+    pa_assert(fdl);
+    pa_assert(fdl->mixer);
+
+    a->defer_enable(fdl->defer, 0);
+
+    num_fds = (unsigned) snd_mixer_poll_descriptors_count(fdl->mixer);
+
+    if (num_fds != fdl->num_fds) {
+        if (fdl->fds)
+            pa_xfree(fdl->fds);
+        if (fdl->work_fds)
+            pa_xfree(fdl->work_fds);
+        fdl->fds = pa_xnew0(struct pollfd, num_fds);
+        fdl->work_fds = pa_xnew(struct pollfd, num_fds);
+    }
+
+    memset(fdl->work_fds, 0, sizeof(struct pollfd) * num_fds);
+
+    if ((err = snd_mixer_poll_descriptors(fdl->mixer, fdl->work_fds, num_fds)) < 0) {
+        pa_log_error("Unable to get poll descriptors: %s", snd_strerror(err));
+        return;
+    }
+
+    fdl->polled = FALSE;
+
+    if (memcmp(fdl->fds, fdl->work_fds, sizeof(struct pollfd) * num_fds) == 0)
+        return;
+
+    if (fdl->ios) {
+        for (i = 0; i < fdl->num_fds; i++)
+            a->io_free(fdl->ios[i]);
+
+        if (num_fds != fdl->num_fds) {
+            pa_xfree(fdl->ios);
+            fdl->ios = NULL;
+        }
+    }
+
+    if (!fdl->ios)
+        fdl->ios = pa_xnew(pa_io_event*, num_fds);
+
+    /* Swap pointers */
+    temp = fdl->work_fds;
+    fdl->work_fds = fdl->fds;
+    fdl->fds = temp;
+
+    fdl->num_fds = num_fds;
+
+    for (i = 0;i < num_fds;i++)
+        fdl->ios[i] = a->io_new(a, fdl->fds[i].fd,
+            ((fdl->fds[i].events & POLLIN) ? PA_IO_EVENT_INPUT : 0) |
+            ((fdl->fds[i].events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0),
+            io_cb, fdl);
+}
+
+struct pa_alsa_fdlist *pa_alsa_fdlist_new(void) {
+    struct pa_alsa_fdlist *fdl;
+
+    fdl = pa_xnew0(struct pa_alsa_fdlist, 1);
+
+    fdl->num_fds = 0;
+    fdl->fds = NULL;
+    fdl->work_fds = NULL;
+    fdl->mixer = NULL;
+    fdl->m = NULL;
+    fdl->defer = NULL;
+    fdl->ios = NULL;
+    fdl->polled = FALSE;
+
+    return fdl;
+}
+
+void pa_alsa_fdlist_free(struct pa_alsa_fdlist *fdl) {
+    pa_assert(fdl);
+
+    if (fdl->defer) {
+        pa_assert(fdl->m);
+        fdl->m->defer_free(fdl->defer);
+    }
+
+    if (fdl->ios) {
+        unsigned i;
+        pa_assert(fdl->m);
+        for (i = 0; i < fdl->num_fds; i++)
+            fdl->m->io_free(fdl->ios[i]);
+        pa_xfree(fdl->ios);
+    }
+
+    if (fdl->fds)
+        pa_xfree(fdl->fds);
+    if (fdl->work_fds)
+        pa_xfree(fdl->work_fds);
+
+    pa_xfree(fdl);
+}
+
+int pa_alsa_fdlist_set_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_handle, pa_mainloop_api* m) {
+    pa_assert(fdl);
+    pa_assert(mixer_handle);
+    pa_assert(m);
+    pa_assert(!fdl->m);
+
+    fdl->mixer = mixer_handle;
+    fdl->m = m;
+    fdl->defer = m->defer_new(m, defer_cb, fdl);
+
+    return 0;
+}
+
+static int set_format(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, pa_sample_format_t *f) {
+
+    static const snd_pcm_format_t format_trans[] = {
+        [PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
+        [PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
+        [PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
+        [PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
+        [PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
+        [PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
+        [PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
+        [PA_SAMPLE_S32LE] = SND_PCM_FORMAT_S32_LE,
+        [PA_SAMPLE_S32BE] = SND_PCM_FORMAT_S32_BE,
+    };
+
+    static const pa_sample_format_t try_order[] = {
+        PA_SAMPLE_FLOAT32NE,
+        PA_SAMPLE_FLOAT32RE,
+        PA_SAMPLE_S32NE,
+        PA_SAMPLE_S32RE,
+        PA_SAMPLE_S16NE,
+        PA_SAMPLE_S16RE,
+        PA_SAMPLE_ALAW,
+        PA_SAMPLE_ULAW,
+        PA_SAMPLE_U8,
+        PA_SAMPLE_INVALID
+    };
+
+    int i, ret;
+
+    pa_assert(pcm_handle);
+    pa_assert(f);
+
+    if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
+        return ret;
+
+    if (*f == PA_SAMPLE_FLOAT32BE)
+        *f = PA_SAMPLE_FLOAT32LE;
+    else if (*f == PA_SAMPLE_FLOAT32LE)
+        *f = PA_SAMPLE_FLOAT32BE;
+    else if (*f == PA_SAMPLE_S16BE)
+        *f = PA_SAMPLE_S16LE;
+    else if (*f == PA_SAMPLE_S16LE)
+        *f = PA_SAMPLE_S16BE;
+    else if (*f == PA_SAMPLE_S32BE)
+        *f = PA_SAMPLE_S32LE;
+    else if (*f == PA_SAMPLE_S32LE)
+        *f = PA_SAMPLE_S32BE;
+    else
+        goto try_auto;
+
+    if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
+        return ret;
+
+try_auto:
+
+    for (i = 0; try_order[i] != PA_SAMPLE_INVALID; i++) {
+        *f = try_order[i];
+
+        if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
+            return ret;
+    }
+
+    return -1;
+}
+
+/* Set the hardware parameters of the given ALSA device. Returns the
+ * selected fragment settings in *period and *period_size */
+int pa_alsa_set_hw_params(
+        snd_pcm_t *pcm_handle,
+        pa_sample_spec *ss,
+        uint32_t *periods,
+        snd_pcm_uframes_t *period_size,
+        snd_pcm_uframes_t tsched_size,
+        pa_bool_t *use_mmap,
+        pa_bool_t *use_tsched,
+        pa_bool_t require_exact_channel_number) {
+
+    int ret = -1;
+    snd_pcm_uframes_t _period_size = *period_size;
+    unsigned int _periods = *periods;
+    snd_pcm_uframes_t buffer_size;
+    unsigned int r = ss->rate;
+    unsigned int c = ss->channels;
+    pa_sample_format_t f = ss->format;
+    snd_pcm_hw_params_t *hwparams;
+    pa_bool_t _use_mmap = use_mmap && *use_mmap;
+    pa_bool_t _use_tsched = use_tsched && *use_tsched;
+    int dir;
+
+    pa_assert(pcm_handle);
+    pa_assert(ss);
+    pa_assert(periods);
+    pa_assert(period_size);
+
+    snd_pcm_hw_params_alloca(&hwparams);
+
+    if ((ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0)
+        goto finish;
+
+    if ((ret = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 0)) < 0)
+        goto finish;
+
+    if (_use_mmap) {
+        if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0) {
+
+            /* mmap() didn't work, fall back to interleaved */
+
+            if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
+                goto finish;
+
+            _use_mmap = FALSE;
+        }
+
+    } else if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
+        goto finish;
+
+    if (!_use_mmap)
+        _use_tsched = FALSE;
+
+    if ((ret = set_format(pcm_handle, hwparams, &f)) < 0)
+        goto finish;
+
+    if ((ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &r, NULL)) < 0)
+        goto finish;
+
+    /* Adjust the buffer sizes, if we didn't get the rate we were asking for */
+    _period_size = (snd_pcm_uframes_t) (((uint64_t) _period_size * r) / ss->rate);
+    tsched_size = (snd_pcm_uframes_t) (((uint64_t) tsched_size * r) / ss->rate);
+
+    if (require_exact_channel_number) {
+        if ((ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, c)) < 0)
+            goto finish;
+    } else {
+        if ((ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0)
+            goto finish;
+    }
+
+    if (_use_tsched) {
+        _period_size = tsched_size;
+        _periods = 1;
+
+        pa_assert_se(snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size) == 0);
+        pa_log_debug("Maximum hw buffer size is %u ms", (unsigned) buffer_size * 1000 / r);
+    }
+
+    buffer_size = _periods * _period_size;
+
+    if ((ret = snd_pcm_hw_params_set_periods_integer(pcm_handle, hwparams)) < 0)
+        goto finish;
+
+    if (_periods > 0) {
+
+        /* First we pass 0 as direction to get exactly what we asked
+         * for. That this is necessary is presumably a bug in ALSA */
+
+        dir = 0;
+        if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) {
+            dir = 1;
+            if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) {
+                dir = -1;
+                if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0)
+                    goto finish;
+            }
+        }
+    }
+
+    if (_period_size > 0)
+        if ((ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0)
+            goto finish;
+
+    if  ((ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0)
+        goto finish;
+
+    if (ss->rate != r)
+        pa_log_warn("Device %s doesn't support %u Hz, changed to %u Hz.", snd_pcm_name(pcm_handle), ss->rate, r);
+
+    if (ss->channels != c)
+        pa_log_warn("Device %s doesn't support %u channels, changed to %u.", snd_pcm_name(pcm_handle), ss->channels, c);
+
+    if (ss->format != f)
+        pa_log_warn("Device %s doesn't support sample format %s, changed to %s.", snd_pcm_name(pcm_handle), pa_sample_format_to_string(ss->format), pa_sample_format_to_string(f));
+
+    if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
+        goto finish;
+
+    if ((ret = snd_pcm_hw_params_get_period_size(hwparams, &_period_size, &dir)) < 0 ||
+        (ret = snd_pcm_hw_params_get_periods(hwparams, &_periods, &dir)) < 0)
+        goto finish;
+
+    /* If the sample rate deviates too much, we need to resample */
+    if (r < ss->rate*.95 || r > ss->rate*1.05)
+        ss->rate = r;
+    ss->channels = (uint8_t) c;
+    ss->format = f;
+
+    pa_assert(_periods > 0);
+    pa_assert(_period_size > 0);
+
+    *periods = _periods;
+    *period_size = _period_size;
+
+    if (use_mmap)
+        *use_mmap = _use_mmap;
+
+    if (use_tsched)
+        *use_tsched = _use_tsched;
+
+    ret = 0;
+
+    snd_pcm_nonblock(pcm_handle, 1);
+
+finish:
+
+    return ret;
+}
+
+int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min) {
+    snd_pcm_sw_params_t *swparams;
+    int err;
+
+    pa_assert(pcm);
+
+    snd_pcm_sw_params_alloca(&swparams);
+
+    if ((err = snd_pcm_sw_params_current(pcm, swparams) < 0)) {
+        pa_log_warn("Unable to determine current swparams: %s\n", snd_strerror(err));
+        return err;
+    }
+
+    if ((err = snd_pcm_sw_params_set_stop_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
+        pa_log_warn("Unable to set stop threshold: %s\n", snd_strerror(err));
+        return err;
+    }
+
+    if ((err = snd_pcm_sw_params_set_start_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
+        pa_log_warn("Unable to set start threshold: %s\n", snd_strerror(err));
+        return err;
+    }
+
+    if ((err = snd_pcm_sw_params_set_avail_min(pcm, swparams, avail_min)) < 0) {
+        pa_log_error("snd_pcm_sw_params_set_avail_min() failed: %s", snd_strerror(err));
+        return err;
+    }
+
+    if ((err = snd_pcm_sw_params(pcm, swparams)) < 0) {
+        pa_log_warn("Unable to set sw params: %s\n", snd_strerror(err));
+        return err;
+    }
+
+    return 0;
+}
+
+struct device_info {
+    pa_channel_map map;
+    const char *name;
+};
+
+static const struct device_info device_table[] = {
+    {{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT } }, "front" },
+
+    {{ 4, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+            PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT }}, "surround40" },
+
+    {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+            PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+            PA_CHANNEL_POSITION_LFE }}, "surround41" },
+
+    {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+            PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+            PA_CHANNEL_POSITION_CENTER }}, "surround50" },
+
+    {{ 6, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+            PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+            PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE }}, "surround51" },
+
+    {{ 8, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+            PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+            PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE,
+            PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT }} , "surround71" },
+
+    {{ 0, { 0 }}, NULL }
+};
+
+static pa_bool_t channel_map_superset(const pa_channel_map *a, const pa_channel_map *b) {
+    pa_bool_t in_a[PA_CHANNEL_POSITION_MAX];
+    unsigned i;
+
+    pa_assert(a);
+    pa_assert(b);
+
+    memset(in_a, 0, sizeof(in_a));
+
+    for (i = 0; i < a->channels; i++)
+        in_a[a->map[i]] = TRUE;
+
+    for (i = 0; i < b->channels; i++)
+        if (!in_a[b->map[i]])
+            return FALSE;
+
+    return TRUE;
+}
+
+snd_pcm_t *pa_alsa_open_by_device_id(
+        const char *dev_id,
+        char **dev,
+        pa_sample_spec *ss,
+        pa_channel_map* map,
+        int mode,
+        uint32_t *nfrags,
+        snd_pcm_uframes_t *period_size,
+        snd_pcm_uframes_t tsched_size,
+        pa_bool_t *use_mmap,
+        pa_bool_t *use_tsched) {
+
+    int i;
+    int direction = 1;
+    int err;
+    char *d;
+    snd_pcm_t *pcm_handle;
+
+    pa_assert(dev_id);
+    pa_assert(dev);
+    pa_assert(ss);
+    pa_assert(map);
+    pa_assert(nfrags);
+    pa_assert(period_size);
+
+    /* First we try to find a device string with a superset of the
+     * requested channel map and open it without the plug: prefix. We
+     * iterate through our device table from top to bottom and take
+     * the first that matches. If we didn't find a working device that
+     * way, we iterate backwards, and check all devices that do not
+     * provide a superset of the requested channel map.*/
+
+    for (i = 0;; i += direction) {
+        pa_sample_spec try_ss;
+        pa_bool_t reformat;
+
+        if (i < 0) {
+            pa_assert(direction == -1);
+
+            /* OK, so we iterated backwards, and now are at the
+             * beginning of our list. */
+
+            break;
+
+        } else if (!device_table[i].name) {
+            pa_assert(direction == 1);
+
+            /* OK, so we are at the end of our list. at iterated
+             * forwards. */
+
+            i--;
+            direction = -1;
+        }
+
+        if ((direction > 0) == !channel_map_superset(&device_table[i].map, map))
+            continue;
+
+        d = pa_sprintf_malloc("%s:%s", device_table[i].name, dev_id);
+
+        reformat = FALSE;
+        for (;;) {
+            pa_log_debug("Trying %s %s SND_PCM_NO_AUTO_FORMAT ...", d, reformat ? "without" : "with");
+
+            /* We don't pass SND_PCM_NONBLOCK here, since alsa-lib <=
+             * 1.0.17a would then ignore the SND_PCM_NO_xxx
+             * flags. Instead we enable nonblock mode afterwards via
+             * snd_pcm_nonblock(). Also see
+             * http://mailman.alsa-project.org/pipermail/alsa-devel/2008-August/010258.html */
+
+            if ((err = snd_pcm_open(&pcm_handle, d, mode,
+                                    /* SND_PCM_NONBLOCK| */
+                                    SND_PCM_NO_AUTO_RESAMPLE|
+                                    SND_PCM_NO_AUTO_CHANNELS|
+                                    (reformat ? 0 : SND_PCM_NO_AUTO_FORMAT))) < 0) {
+                pa_log_info("Couldn't open PCM device %s: %s", d, snd_strerror(err));
+                break;
+            }
+
+            try_ss.channels = device_table[i].map.channels;
+            try_ss.rate = ss->rate;
+            try_ss.format = ss->format;
+
+            if ((err = pa_alsa_set_hw_params(pcm_handle, &try_ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, TRUE)) < 0) {
+
+                if (!reformat) {
+                    reformat = TRUE;
+                    snd_pcm_close(pcm_handle);
+                    continue;
+                }
+
+                if (!pa_startswith(d, "plug:") && !pa_startswith(d, "plughw:")) {
+                    char *t;
+
+                    t = pa_sprintf_malloc("plug:%s", d);
+                    pa_xfree(d);
+                    d = t;
+
+                    reformat = FALSE;
+
+                    snd_pcm_close(pcm_handle);
+                    continue;
+                }
+
+                pa_log_info("PCM device %s refused our hw parameters: %s", d, snd_strerror(err));
+                snd_pcm_close(pcm_handle);
+                break;
+            }
+
+            *ss = try_ss;
+            *map = device_table[i].map;
+            pa_assert(map->channels == ss->channels);
+            *dev = d;
+            return pcm_handle;
+        }
+
+        pa_xfree(d);
+    }
+
+    /* OK, we didn't find any good device, so let's try the raw plughw: stuff */
+
+    d = pa_sprintf_malloc("hw:%s", dev_id);
+    pa_log_debug("Trying %s as last resort...", d);
+    pcm_handle = pa_alsa_open_by_device_string(d, dev, ss, map, mode, nfrags, period_size, tsched_size, use_mmap, use_tsched);
+    pa_xfree(d);
+
+    return pcm_handle;
+}
+
+snd_pcm_t *pa_alsa_open_by_device_string(
+        const char *device,
+        char **dev,
+        pa_sample_spec *ss,
+        pa_channel_map* map,
+        int mode,
+        uint32_t *nfrags,
+        snd_pcm_uframes_t *period_size,
+        snd_pcm_uframes_t tsched_size,
+        pa_bool_t *use_mmap,
+        pa_bool_t *use_tsched) {
+
+    int err;
+    char *d;
+    snd_pcm_t *pcm_handle;
+    pa_bool_t reformat = FALSE;
+
+    pa_assert(device);
+    pa_assert(dev);
+    pa_assert(ss);
+    pa_assert(map);
+    pa_assert(nfrags);
+    pa_assert(period_size);
+
+    d = pa_xstrdup(device);
+
+    for (;;) {
+        pa_log_debug("Trying %s %s SND_PCM_NO_AUTO_FORMAT ...", d, reformat ? "without" : "with");
+
+        /* We don't pass SND_PCM_NONBLOCK here, since alsa-lib <=
+         * 1.0.17a would then ignore the SND_PCM_NO_xxx flags. Instead
+         * we enable nonblock mode afterwards via
+         * snd_pcm_nonblock(). Also see
+         * http://mailman.alsa-project.org/pipermail/alsa-devel/2008-August/010258.html */
+
+        if ((err = snd_pcm_open(&pcm_handle, d, mode,
+                                /*SND_PCM_NONBLOCK|*/
+                                SND_PCM_NO_AUTO_RESAMPLE|
+                                SND_PCM_NO_AUTO_CHANNELS|
+                                (reformat ? 0 : SND_PCM_NO_AUTO_FORMAT))) < 0) {
+            pa_log("Error opening PCM device %s: %s", d, snd_strerror(err));
+            pa_xfree(d);
+            return NULL;
+        }
+
+        if ((err = pa_alsa_set_hw_params(pcm_handle, ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, FALSE)) < 0) {
+
+            if (!reformat) {
+                reformat = TRUE;
+
+                snd_pcm_close(pcm_handle);
+                continue;
+            }
+
+            /* Hmm, some hw is very exotic, so we retry with plug, if without it didn't work */
+
+            if (!pa_startswith(d, "plug:") && !pa_startswith(d, "plughw:")) {
+                char *t;
+
+                t = pa_sprintf_malloc("plug:%s", d);
+                pa_xfree(d);
+                d = t;
+
+                reformat = FALSE;
+
+                snd_pcm_close(pcm_handle);
+                continue;
+            }
+
+            pa_log("Failed to set hardware parameters on %s: %s", d, snd_strerror(err));
+            pa_xfree(d);
+            snd_pcm_close(pcm_handle);
+            return NULL;
+        }
+
+        *dev = d;
+
+        if (ss->channels != map->channels)
+            pa_channel_map_init_extend(map, ss->channels, PA_CHANNEL_MAP_ALSA);
+
+        return pcm_handle;
+    }
+}
+
+int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) {
+    int err;
+
+    pa_assert(mixer);
+    pa_assert(dev);
+
+    if ((err = snd_mixer_attach(mixer, dev)) < 0) {
+        pa_log_info("Unable to attach to mixer %s: %s", dev, snd_strerror(err));
+        return -1;
+    }
+
+    if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
+        pa_log_warn("Unable to register mixer: %s", snd_strerror(err));
+        return -1;
+    }
+
+    if ((err = snd_mixer_load(mixer)) < 0) {
+        pa_log_warn("Unable to load mixer: %s", snd_strerror(err));
+        return -1;
+    }
+
+    pa_log_info("Successfully attached to mixer '%s'", dev);
+
+    return 0;
+}
+
+static pa_bool_t elem_has_volume(snd_mixer_elem_t *elem, pa_bool_t playback) {
+    pa_assert(elem);
+
+    if (playback && snd_mixer_selem_has_playback_volume(elem))
+        return TRUE;
+
+    if (!playback && snd_mixer_selem_has_capture_volume(elem))
+        return TRUE;
+
+    return FALSE;
+}
+
+static pa_bool_t elem_has_switch(snd_mixer_elem_t *elem, pa_bool_t playback) {
+    pa_assert(elem);
+
+    if (playback && snd_mixer_selem_has_playback_switch(elem))
+        return TRUE;
+
+    if (!playback && snd_mixer_selem_has_capture_switch(elem))
+        return TRUE;
+
+    return FALSE;
+}
+
+snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback, pa_bool_t playback) {
+    snd_mixer_elem_t *elem = NULL, *fallback_elem = NULL;
+    snd_mixer_selem_id_t *sid = NULL;
+
+    snd_mixer_selem_id_alloca(&sid);
+
+    pa_assert(mixer);
+    pa_assert(name);
+
+    snd_mixer_selem_id_set_name(sid, name);
+
+    if ((elem = snd_mixer_find_selem(mixer, sid))) {
+
+        if (elem_has_volume(elem, playback) &&
+            elem_has_switch(elem, playback))
+            goto success;
+
+        if (!elem_has_volume(elem, playback) &&
+            !elem_has_switch(elem, playback))
+            elem = NULL;
+    }
+
+    pa_log_info("Cannot find mixer control \"%s\" or mixer control is no combination of switch/volume.", snd_mixer_selem_id_get_name(sid));
+
+    if (fallback) {
+        snd_mixer_selem_id_set_name(sid, fallback);
+
+        if ((fallback_elem = snd_mixer_find_selem(mixer, sid))) {
+
+            if (elem_has_volume(fallback_elem, playback) &&
+                elem_has_switch(fallback_elem, playback)) {
+                elem = fallback_elem;
+                goto success;
+            }
+
+            if (!elem_has_volume(fallback_elem, playback) &&
+                !elem_has_switch(fallback_elem, playback))
+                fallback_elem = NULL;
+        }
+
+        pa_log_warn("Cannot find fallback mixer control \"%s\" or mixer control is no combination of switch/volume.", snd_mixer_selem_id_get_name(sid));
+    }
+
+    if (elem && fallback_elem) {
+
+        /* Hmm, so we have both elements, but neither has both mute
+         * and volume. Let's prefer the one with the volume */
+
+        if (elem_has_volume(elem, playback))
+            goto success;
+
+        if (elem_has_volume(fallback_elem, playback)) {
+            elem = fallback_elem;
+            goto success;
+        }
+    }
+
+    if (!elem && fallback_elem)
+        elem = fallback_elem;
+
+success:
+
+    if (elem)
+        pa_log_info("Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
+
+    return elem;
+}
+
+static const snd_mixer_selem_channel_id_t alsa_channel_ids[PA_CHANNEL_POSITION_MAX] = {
+    [PA_CHANNEL_POSITION_MONO] = SND_MIXER_SCHN_MONO, /* The ALSA name is just an alias! */
+
+    [PA_CHANNEL_POSITION_FRONT_CENTER] = SND_MIXER_SCHN_FRONT_CENTER,
+    [PA_CHANNEL_POSITION_FRONT_LEFT] = SND_MIXER_SCHN_FRONT_LEFT,
+    [PA_CHANNEL_POSITION_FRONT_RIGHT] = SND_MIXER_SCHN_FRONT_RIGHT,
+
+    [PA_CHANNEL_POSITION_REAR_CENTER] = SND_MIXER_SCHN_REAR_CENTER,
+    [PA_CHANNEL_POSITION_REAR_LEFT] = SND_MIXER_SCHN_REAR_LEFT,
+    [PA_CHANNEL_POSITION_REAR_RIGHT] = SND_MIXER_SCHN_REAR_RIGHT,
+
+    [PA_CHANNEL_POSITION_LFE] = SND_MIXER_SCHN_WOOFER,
+
+    [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
+
+    [PA_CHANNEL_POSITION_SIDE_LEFT] = SND_MIXER_SCHN_SIDE_LEFT,
+    [PA_CHANNEL_POSITION_SIDE_RIGHT] = SND_MIXER_SCHN_SIDE_RIGHT,
+
+    [PA_CHANNEL_POSITION_AUX0] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX1] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX2] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX3] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX4] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX5] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX6] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX7] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX8] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX9] =  SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX10] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX11] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX12] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX13] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX14] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX15] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX16] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX17] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX18] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX19] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX20] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX21] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX22] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX23] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX24] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX25] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX26] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX27] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX28] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX29] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX30] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_AUX31] = SND_MIXER_SCHN_UNKNOWN,
+
+    [PA_CHANNEL_POSITION_TOP_CENTER] = SND_MIXER_SCHN_UNKNOWN,
+
+    [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = SND_MIXER_SCHN_UNKNOWN,
+
+    [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = SND_MIXER_SCHN_UNKNOWN,
+    [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = SND_MIXER_SCHN_UNKNOWN
+};
+
+
+int pa_alsa_calc_mixer_map(snd_mixer_elem_t *elem, const pa_channel_map *channel_map, snd_mixer_selem_channel_id_t mixer_map[], pa_bool_t playback) {
+    unsigned i;
+    pa_bool_t alsa_channel_used[SND_MIXER_SCHN_LAST];
+    pa_bool_t mono_used = FALSE;
+
+    pa_assert(elem);
+    pa_assert(channel_map);
+    pa_assert(mixer_map);
+
+    memset(&alsa_channel_used, 0, sizeof(alsa_channel_used));
+
+    if (channel_map->channels > 1 &&
+        ((playback && snd_mixer_selem_has_playback_volume_joined(elem)) ||
+         (!playback && snd_mixer_selem_has_capture_volume_joined(elem)))) {
+        pa_log_info("ALSA device lacks independant volume controls for each channel.");
+        return -1;
+    }
+
+    for (i = 0; i < channel_map->channels; i++) {
+        snd_mixer_selem_channel_id_t id;
+        pa_bool_t is_mono;
+
+        is_mono = channel_map->map[i] == PA_CHANNEL_POSITION_MONO;
+        id = alsa_channel_ids[channel_map->map[i]];
+
+        if (!is_mono && id == SND_MIXER_SCHN_UNKNOWN) {
+            pa_log_info("Configured channel map contains channel '%s' that is unknown to the ALSA mixer.", pa_channel_position_to_string(channel_map->map[i]));
+            return -1;
+        }
+
+        if ((is_mono && mono_used) || (!is_mono && alsa_channel_used[id])) {
+            pa_log_info("Channel map has duplicate channel '%s', falling back to software volume control.", pa_channel_position_to_string(channel_map->map[i]));
+            return -1;
+        }
+
+        if ((playback && (!snd_mixer_selem_has_playback_channel(elem, id) || (is_mono && !snd_mixer_selem_is_playback_mono(elem)))) ||
+            (!playback && (!snd_mixer_selem_has_capture_channel(elem, id) || (is_mono && !snd_mixer_selem_is_capture_mono(elem))))) {
+
+            pa_log_info("ALSA device lacks separate volumes control for channel '%s'", pa_channel_position_to_string(channel_map->map[i]));
+            return -1;
+        }
+
+        if (is_mono) {
+            mixer_map[i] = SND_MIXER_SCHN_MONO;
+            mono_used = TRUE;
+        } else {
+            mixer_map[i] = id;
+            alsa_channel_used[id] = TRUE;
+        }
+    }
+
+    pa_log_info("All %u channels can be mapped to mixer channels.", channel_map->channels);
+
+    return 0;
+}
+
+void pa_alsa_dump(snd_pcm_t *pcm) {
+    int err;
+    snd_output_t *out;
+
+    pa_assert(pcm);
+
+    pa_assert_se(snd_output_buffer_open(&out) == 0);
+
+    if ((err = snd_pcm_dump(pcm, out)) < 0)
+        pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
+    else {
+        char *s = NULL;
+        snd_output_buffer_string(out, &s);
+        pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
+    }
+
+    pa_assert_se(snd_output_close(out) == 0);
+}
+
+void pa_alsa_dump_status(snd_pcm_t *pcm) {
+    int err;
+    snd_output_t *out;
+    snd_pcm_status_t *status;
+
+    pa_assert(pcm);
+
+    snd_pcm_status_alloca(&status);
+
+    pa_assert_se(snd_output_buffer_open(&out) == 0);
+
+    pa_assert_se(snd_pcm_status(pcm, status) == 0);
+
+    if ((err = snd_pcm_status_dump(status, out)) < 0)
+        pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
+    else {
+        char *s = NULL;
+        snd_output_buffer_string(out, &s);
+        pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
+    }
+
+    pa_assert_se(snd_output_close(out) == 0);
+}
+
+static void alsa_error_handler(const char *file, int line, const char *function, int err, const char *fmt,...) {
+    va_list ap;
+    char *alsa_file;
+
+    alsa_file = pa_sprintf_malloc("(alsa-lib)%s", file);
+
+    va_start(ap, fmt);
+
+    pa_log_levelv_meta(PA_LOG_INFO, alsa_file, line, function, fmt, ap);
+
+    va_end(ap);
+
+    pa_xfree(alsa_file);
+}
+
+static pa_atomic_t n_error_handler_installed = PA_ATOMIC_INIT(0);
+
+void pa_alsa_redirect_errors_inc(void) {
+    /* This is not really thread safe, but we do our best */
+
+    if (pa_atomic_inc(&n_error_handler_installed) == 0)
+        snd_lib_error_set_handler(alsa_error_handler);
+}
+
+void pa_alsa_redirect_errors_dec(void) {
+    int r;
+
+    pa_assert_se((r = pa_atomic_dec(&n_error_handler_installed)) >= 1);
+
+    if (r == 1)
+        snd_lib_error_set_handler(NULL);
+}
+
+void pa_alsa_init_proplist(pa_proplist *p, snd_pcm_info_t *pcm_info) {
+
+    static const char * const alsa_class_table[SND_PCM_CLASS_LAST+1] = {
+        [SND_PCM_CLASS_GENERIC] = "generic",
+        [SND_PCM_CLASS_MULTI] = "multi",
+        [SND_PCM_CLASS_MODEM] = "modem",
+        [SND_PCM_CLASS_DIGITIZER] = "digitizer"
+    };
+    static const char * const class_table[SND_PCM_CLASS_LAST+1] = {
+        [SND_PCM_CLASS_GENERIC] = "sound",
+        [SND_PCM_CLASS_MULTI] = NULL,
+        [SND_PCM_CLASS_MODEM] = "modem",
+        [SND_PCM_CLASS_DIGITIZER] = NULL
+    };
+    static const char * const alsa_subclass_table[SND_PCM_SUBCLASS_LAST+1] = {
+        [SND_PCM_SUBCLASS_GENERIC_MIX] = "generic-mix",
+        [SND_PCM_SUBCLASS_MULTI_MIX] = "multi-mix"
+    };
+
+    snd_pcm_class_t class;
+    snd_pcm_subclass_t subclass;
+    const char *n, *id, *sdn;
+    char *cn = NULL, *lcn = NULL;
+    int card;
+
+    pa_assert(p);
+    pa_assert(pcm_info);
+
+    pa_proplist_sets(p, PA_PROP_DEVICE_API, "alsa");
+
+    class = snd_pcm_info_get_class(pcm_info);
+    if (class <= SND_PCM_CLASS_LAST) {
+        if (class_table[class])
+            pa_proplist_sets(p, PA_PROP_DEVICE_CLASS, class_table[class]);
+        if (alsa_class_table[class])
+            pa_proplist_sets(p, "alsa.class", alsa_class_table[class]);
+    }
+    subclass = snd_pcm_info_get_subclass(pcm_info);
+    if (subclass <= SND_PCM_SUBCLASS_LAST)
+        if (alsa_subclass_table[subclass])
+            pa_proplist_sets(p, "alsa.subclass", alsa_subclass_table[subclass]);
+
+    if ((n = snd_pcm_info_get_name(pcm_info)))
+        pa_proplist_sets(p, "alsa.name", n);
+
+    if ((id = snd_pcm_info_get_id(pcm_info)))
+        pa_proplist_sets(p, "alsa.id", id);
+
+    pa_proplist_setf(p, "alsa.subdevice", "%u", snd_pcm_info_get_subdevice(pcm_info));
+    if ((sdn = snd_pcm_info_get_subdevice_name(pcm_info)))
+        pa_proplist_sets(p, "alsa.subdevice_name", sdn);
+
+    pa_proplist_setf(p, "alsa.device", "%u", snd_pcm_info_get_device(pcm_info));
+
+    if ((card = snd_pcm_info_get_card(pcm_info)) >= 0) {
+        pa_proplist_setf(p, "alsa.card", "%i", card);
+
+        if (snd_card_get_name(card, &cn) >= 0)
+            pa_proplist_sets(p, "alsa.card_name", cn);
+
+        if (snd_card_get_longname(card, &lcn) >= 0)
+            pa_proplist_sets(p, "alsa.long_card_name", lcn);
+    }
+
+    if (cn && n)
+        pa_proplist_setf(p, PA_PROP_DEVICE_DESCRIPTION, "%s - %s", cn, n);
+    else if (cn)
+        pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, cn);
+    else if (n)
+        pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, n);
+
+    free(lcn);
+    free(cn);
+}
+
+int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) {
+    snd_pcm_state_t state;
+    int err;
+
+    pa_assert(pcm);
+
+    if (revents & POLLERR)
+        pa_log_debug("Got POLLERR from ALSA");
+    if (revents & POLLNVAL)
+        pa_log_warn("Got POLLNVAL from ALSA");
+    if (revents & POLLHUP)
+        pa_log_warn("Got POLLHUP from ALSA");
+    if (revents & POLLPRI)
+        pa_log_warn("Got POLLPRI from ALSA");
+    if (revents & POLLIN)
+        pa_log_debug("Got POLLIN from ALSA");
+    if (revents & POLLOUT)
+        pa_log_debug("Got POLLOUT from ALSA");
+
+    state = snd_pcm_state(pcm);
+    pa_log_debug("PCM state is %s", snd_pcm_state_name(state));
+
+    /* Try to recover from this error */
+
+    switch (state) {
+
+        case SND_PCM_STATE_XRUN:
+            if ((err = snd_pcm_recover(pcm, -EPIPE, 1)) != 0) {
+                pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: %s", snd_strerror(err));
+                return -1;
+            }
+            break;
+
+        case SND_PCM_STATE_SUSPENDED:
+            if ((err = snd_pcm_recover(pcm, -ESTRPIPE, 1)) != 0) {
+                pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and SUSPENDED: %s", snd_strerror(err));
+                return -1;
+            }
+            break;
+
+        default:
+
+            snd_pcm_drop(pcm);
+
+            if ((err = snd_pcm_prepare(pcm)) < 0) {
+                pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): %s", snd_strerror(err));
+                return -1;
+            }
+            break;
+    }
+
+    return 0;
+}
+
+pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll) {
+    int n, err;
+    struct pollfd *pollfd;
+    pa_rtpoll_item *item;
+
+    pa_assert(pcm);
+
+    if ((n = snd_pcm_poll_descriptors_count(pcm)) < 0) {
+        pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(n));
+        return NULL;
+    }
+
+    item = pa_rtpoll_item_new(rtpoll, PA_RTPOLL_NEVER, (unsigned) n);
+    pollfd = pa_rtpoll_item_get_pollfd(item, NULL);
+
+    if ((err = snd_pcm_poll_descriptors(pcm, pollfd, (unsigned) n)) < 0) {
+        pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
+        pa_rtpoll_item_free(item);
+        return NULL;
+    }
+
+    return item;
+}
+
+snd_pcm_sframes_t pa_alsa_safe_avail_update(snd_pcm_t *pcm, size_t hwbuf_size, const pa_sample_spec *ss) {
+    snd_pcm_sframes_t n;
+    size_t k;
+
+    pa_assert(pcm);
+    pa_assert(hwbuf_size > 0);
+    pa_assert(ss);
+
+    /* Some ALSA driver expose weird bugs, let's inform the user about
+     * what is going on */
+
+    n = snd_pcm_avail_update(pcm);
+
+    if (n <= 0)
+        return n;
+
+    k = (size_t) n * pa_frame_size(ss);
+
+    if (k >= hwbuf_size * 3 ||
+        k >= pa_bytes_per_second(ss)*10)
+        pa_log("snd_pcm_avail_update() returned a value that is exceptionally large: %lu bytes (%lu ms) "
+               "Most likely this is an ALSA driver bug. Please report this issue to the PulseAudio developers.",
+               (unsigned long) k, (unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC));
+
+    return n;
+}
+
+int pa_alsa_safe_mmap_begin(snd_pcm_t *pcm, const snd_pcm_channel_area_t **areas, snd_pcm_uframes_t *offset, snd_pcm_uframes_t *frames, size_t hwbuf_size, const pa_sample_spec *ss) {
+    int r;
+    snd_pcm_uframes_t before;
+    size_t k;
+
+    pa_assert(pcm);
+    pa_assert(areas);
+    pa_assert(offset);
+    pa_assert(frames);
+    pa_assert(hwbuf_size > 0);
+    pa_assert(ss);
+
+    before = *frames;
+
+    r = snd_pcm_mmap_begin(pcm, areas, offset, frames);
+
+    if (r < 0)
+        return r;
+
+    k = (size_t) *frames * pa_frame_size(ss);
+
+    if (*frames > before ||
+        k >= hwbuf_size * 3 ||
+        k >= pa_bytes_per_second(ss)*10)
+
+        pa_log("snd_pcm_mmap_begin() returned a value that is exceptionally large: %lu bytes (%lu ms) "
+               "Most likely this is an ALSA driver bug. Please report this issue to the PulseAudio developers.",
+               (unsigned long) k, (unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC));
+
+    return r;
+}
diff --git a/src/modules/alsa/alsa-util.h b/src/modules/alsa/alsa-util.h
new file mode 100644
index 00000000..95bb983a
--- /dev/null
+++ b/src/modules/alsa/alsa-util.h
@@ -0,0 +1,98 @@
+#ifndef fooalsautilhfoo
+#define fooalsautilhfoo
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#include <asoundlib.h>
+
+#include <pulse/sample.h>
+#include <pulse/volume.h>
+#include <pulse/mainloop-api.h>
+#include <pulse/channelmap.h>
+#include <pulse/proplist.h>
+
+#include <pulsecore/rtpoll.h>
+
+typedef struct pa_alsa_fdlist pa_alsa_fdlist;
+
+struct pa_alsa_fdlist *pa_alsa_fdlist_new(void);
+void pa_alsa_fdlist_free(struct pa_alsa_fdlist *fdl);
+int pa_alsa_fdlist_set_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_handle, pa_mainloop_api* m);
+
+int pa_alsa_set_hw_params(
+        snd_pcm_t *pcm_handle,
+        pa_sample_spec *ss,
+        uint32_t *periods,
+        snd_pcm_uframes_t *period_size,
+        snd_pcm_uframes_t tsched_size,
+        pa_bool_t *use_mmap,
+        pa_bool_t *use_tsched,
+        pa_bool_t require_exact_channel_number);
+
+int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min);
+
+int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev);
+snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback, pa_bool_t playback);
+
+snd_pcm_t *pa_alsa_open_by_device_id(
+        const char *dev_id,
+        char **dev,
+        pa_sample_spec *ss,
+        pa_channel_map* map,
+        int mode,
+        uint32_t *nfrags,
+        snd_pcm_uframes_t *period_size,
+        snd_pcm_uframes_t tsched_size,
+        pa_bool_t *use_mmap,
+        pa_bool_t *use_tsched);
+
+snd_pcm_t *pa_alsa_open_by_device_string(
+        const char *device,
+        char **dev,
+        pa_sample_spec *ss,
+        pa_channel_map* map,
+        int mode,
+        uint32_t *nfrags,
+        snd_pcm_uframes_t *period_size,
+        snd_pcm_uframes_t tsched_size,
+        pa_bool_t *use_mmap,
+        pa_bool_t *use_tsched);
+
+int pa_alsa_calc_mixer_map(snd_mixer_elem_t *elem, const pa_channel_map *channel_map, snd_mixer_selem_channel_id_t mixer_map[], pa_bool_t playback);
+
+void pa_alsa_dump(snd_pcm_t *pcm);
+void pa_alsa_dump_status(snd_pcm_t *pcm);
+
+void pa_alsa_redirect_errors_inc(void);
+void pa_alsa_redirect_errors_dec(void);
+
+void pa_alsa_init_proplist(pa_proplist *p, snd_pcm_info_t *pcm_info);
+
+int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents);
+
+pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll);
+
+snd_pcm_sframes_t pa_alsa_safe_avail_update(snd_pcm_t *pcm, size_t hwbuf_size, const pa_sample_spec *ss);
+int pa_alsa_safe_mmap_begin(snd_pcm_t *pcm, const snd_pcm_channel_area_t **areas, snd_pcm_uframes_t *offset, snd_pcm_uframes_t *frames, size_t hwbuf_size, const pa_sample_spec *ss);
+
+#endif
diff --git a/src/modules/alsa/module-alsa-sink.c b/src/modules/alsa/module-alsa-sink.c
new file mode 100644
index 00000000..a3e818dd
--- /dev/null
+++ b/src/modules/alsa/module-alsa-sink.c
@@ -0,0 +1,1674 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2008 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+
+#include <asoundlib.h>
+
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+#include <valgrind/memcheck.h>
+#endif
+
+#include <pulse/xmalloc.h>
+#include <pulse/util.h>
+#include <pulse/timeval.h>
+
+#include <pulsecore/core.h>
+#include <pulsecore/module.h>
+#include <pulsecore/memchunk.h>
+#include <pulsecore/sink.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/sample-util.h>
+#include <pulsecore/log.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/core-error.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
+#include <pulsecore/rtclock.h>
+#include <pulsecore/time-smoother.h>
+
+#include "alsa-util.h"
+#include "module-alsa-sink-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering");
+PA_MODULE_DESCRIPTION("ALSA Sink");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(FALSE);
+PA_MODULE_USAGE(
+        "sink_name=<name for the sink> "
+        "device=<ALSA device> "
+        "device_id=<ALSA card index> "
+        "format=<sample format> "
+        "rate=<sample rate> "
+        "channels=<number of channels> "
+        "channel_map=<channel map> "
+        "fragments=<number of fragments> "
+        "fragment_size=<fragment size> "
+        "mmap=<enable memory mapping?> "
+        "tsched=<enable system timer based scheduling mode?> "
+        "tsched_buffer_size=<buffer size when using timer based scheduling> "
+        "tsched_buffer_watermark=<lower fill watermark>");
+
+static const char* const valid_modargs[] = {
+    "sink_name",
+    "device",
+    "device_id",
+    "format",
+    "rate",
+    "channels",
+    "channel_map",
+    "fragments",
+    "fragment_size",
+    "mmap",
+    "tsched",
+    "tsched_buffer_size",
+    "tsched_buffer_watermark",
+    NULL
+};
+
+#define DEFAULT_DEVICE "default"
+#define DEFAULT_TSCHED_BUFFER_USEC (2*PA_USEC_PER_SEC)            /* 2s */
+#define DEFAULT_TSCHED_WATERMARK_USEC (20*PA_USEC_PER_MSEC)       /* 20ms */
+#define TSCHED_MIN_SLEEP_USEC (3*PA_USEC_PER_MSEC)                /* 3ms */
+#define TSCHED_MIN_WAKEUP_USEC (3*PA_USEC_PER_MSEC)               /* 3ms */
+
+struct userdata {
+    pa_core *core;
+    pa_module *module;
+    pa_sink *sink;
+
+    pa_thread *thread;
+    pa_thread_mq thread_mq;
+    pa_rtpoll *rtpoll;
+
+    snd_pcm_t *pcm_handle;
+
+    pa_alsa_fdlist *mixer_fdl;
+    snd_mixer_t *mixer_handle;
+    snd_mixer_elem_t *mixer_elem;
+    long hw_volume_max, hw_volume_min;
+    long hw_dB_max, hw_dB_min;
+    pa_bool_t hw_dB_supported;
+    pa_bool_t mixer_seperate_channels;
+    pa_cvolume hardware_volume;
+
+    size_t frame_size, fragment_size, hwbuf_size, tsched_watermark;
+    unsigned nfragments;
+    pa_memchunk memchunk;
+
+    char *device_name;
+
+    pa_bool_t use_mmap, use_tsched;
+
+    pa_bool_t first, after_rewind;
+
+    pa_rtpoll_item *alsa_rtpoll_item;
+
+    snd_mixer_selem_channel_id_t mixer_map[SND_MIXER_SCHN_LAST];
+
+    pa_smoother *smoother;
+    int64_t frame_index;
+    uint64_t since_start;
+
+    snd_pcm_sframes_t hwbuf_unused_frames;
+};
+
+static void fix_tsched_watermark(struct userdata *u) {
+    size_t max_use;
+    size_t min_sleep, min_wakeup;
+    pa_assert(u);
+
+    max_use = u->hwbuf_size - (size_t) u->hwbuf_unused_frames * u->frame_size;
+
+    min_sleep = pa_usec_to_bytes(TSCHED_MIN_SLEEP_USEC, &u->sink->sample_spec);
+    min_wakeup = pa_usec_to_bytes(TSCHED_MIN_WAKEUP_USEC, &u->sink->sample_spec);
+
+    if (min_sleep > max_use/2)
+        min_sleep = pa_frame_align(max_use/2, &u->sink->sample_spec);
+    if (min_sleep < u->frame_size)
+        min_sleep = u->frame_size;
+
+    if (min_wakeup > max_use/2)
+        min_wakeup = pa_frame_align(max_use/2, &u->sink->sample_spec);
+    if (min_wakeup < u->frame_size)
+        min_wakeup = u->frame_size;
+
+    if (u->tsched_watermark > max_use-min_sleep)
+        u->tsched_watermark = max_use-min_sleep;
+
+    if (u->tsched_watermark < min_wakeup)
+        u->tsched_watermark = min_wakeup;
+}
+
+static void hw_sleep_time(struct userdata *u, pa_usec_t *sleep_usec, pa_usec_t*process_usec) {
+    pa_usec_t usec, wm;
+
+    pa_assert(sleep_usec);
+    pa_assert(process_usec);
+
+    pa_assert(u);
+
+    usec = pa_sink_get_requested_latency_within_thread(u->sink);
+
+    if (usec == (pa_usec_t) -1)
+        usec = pa_bytes_to_usec(u->hwbuf_size, &u->sink->sample_spec);
+
+/*     pa_log_debug("hw buffer time: %u ms", (unsigned) (usec / PA_USEC_PER_MSEC)); */
+
+    wm = pa_bytes_to_usec(u->tsched_watermark, &u->sink->sample_spec);
+
+    if (usec >= wm) {
+        *sleep_usec = usec - wm;
+        *process_usec = wm;
+    } else
+        *process_usec = *sleep_usec = usec / 2;
+
+/*     pa_log_debug("after watermark: %u ms", (unsigned) (*sleep_usec / PA_USEC_PER_MSEC)); */
+}
+
+static int try_recover(struct userdata *u, const char *call, int err) {
+    pa_assert(u);
+    pa_assert(call);
+    pa_assert(err < 0);
+
+    pa_log_debug("%s: %s", call, snd_strerror(err));
+
+    pa_assert(err != -EAGAIN);
+
+    if (err == -EPIPE)
+        pa_log_debug("%s: Buffer underrun!", call);
+
+    if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0) {
+        u->first = TRUE;
+        u->since_start = 0;
+        return 0;
+    }
+
+    pa_log("%s: %s", call, snd_strerror(err));
+    return -1;
+}
+
+static size_t check_left_to_play(struct userdata *u, snd_pcm_sframes_t n) {
+    size_t left_to_play;
+
+    if ((size_t) n*u->frame_size < u->hwbuf_size)
+        left_to_play = u->hwbuf_size - ((size_t) n*u->frame_size);
+    else
+        left_to_play = 0;
+
+    if (left_to_play > 0) {
+/*         pa_log_debug("%0.2f ms left to play", (double) pa_bytes_to_usec(left_to_play, &u->sink->sample_spec) / PA_USEC_PER_MSEC); */
+    } else if (!u->first && !u->after_rewind) {
+        pa_log_info("Underrun!");
+
+        if (u->use_tsched) {
+            size_t old_watermark = u->tsched_watermark;
+
+            u->tsched_watermark *= 2;
+            fix_tsched_watermark(u);
+
+            if (old_watermark != u->tsched_watermark)
+                pa_log_notice("Increasing wakeup watermark to %0.2f ms",
+                              (double) pa_bytes_to_usec(u->tsched_watermark, &u->sink->sample_spec) / PA_USEC_PER_MSEC);
+        }
+    }
+
+    return left_to_play;
+}
+
+static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled) {
+    int work_done = 0;
+    pa_usec_t max_sleep_usec = 0, process_usec = 0;
+    size_t left_to_play;
+
+    pa_assert(u);
+    pa_sink_assert_ref(u->sink);
+
+    if (u->use_tsched)
+        hw_sleep_time(u, &max_sleep_usec, &process_usec);
+
+    for (;;) {
+        snd_pcm_sframes_t n;
+        int r;
+
+        snd_pcm_hwsync(u->pcm_handle);
+
+        /* First we determine how many samples are missing to fill the
+         * buffer up to 100% */
+
+        if (PA_UNLIKELY((n = pa_alsa_safe_avail_update(u->pcm_handle, u->hwbuf_size, &u->sink->sample_spec)) < 0)) {
+
+            if ((r = try_recover(u, "snd_pcm_avail_update", (int) n)) == 0)
+                continue;
+
+            return r;
+        }
+
+        left_to_play = check_left_to_play(u, n);
+
+        if (u->use_tsched)
+
+            /* We won't fill up the playback buffer before at least
+            * half the sleep time is over because otherwise we might
+            * ask for more data from the clients then they expect. We
+            * need to guarantee that clients only have to keep around
+            * a single hw buffer length. */
+
+            if (!polled &&
+                pa_bytes_to_usec(left_to_play, &u->sink->sample_spec) > process_usec+max_sleep_usec/2)
+                break;
+
+        if (PA_UNLIKELY(n <= u->hwbuf_unused_frames)) {
+
+            if (polled)
+                pa_log("ALSA woke us up to write new data to the device, but there was actually nothing to write! "
+                       "Most likely this is an ALSA driver bug. Please report this issue to the ALSA developers. "
+                       "We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail_update() returned 0.");
+
+            break;
+        }
+
+        n -= u->hwbuf_unused_frames;
+
+        polled = FALSE;
+
+/*         pa_log_debug("Filling up"); */
+
+        for (;;) {
+            pa_memchunk chunk;
+            void *p;
+            int err;
+            const snd_pcm_channel_area_t *areas;
+            snd_pcm_uframes_t offset, frames = (snd_pcm_uframes_t) n;
+            snd_pcm_sframes_t sframes;
+
+/*             pa_log_debug("%lu frames to write", (unsigned long) frames); */
+
+            if (PA_UNLIKELY((err = pa_alsa_safe_mmap_begin(u->pcm_handle, &areas, &offset, &frames, u->hwbuf_size, &u->sink->sample_spec)) < 0)) {
+
+                if ((r = try_recover(u, "snd_pcm_mmap_begin", err)) == 0)
+                    continue;
+
+                return r;
+            }
+
+            /* Make sure that if these memblocks need to be copied they will fit into one slot */
+            if (frames > pa_mempool_block_size_max(u->sink->core->mempool)/u->frame_size)
+                frames = pa_mempool_block_size_max(u->sink->core->mempool)/u->frame_size;
+
+            /* Check these are multiples of 8 bit */
+            pa_assert((areas[0].first & 7) == 0);
+            pa_assert((areas[0].step & 7)== 0);
+
+            /* We assume a single interleaved memory buffer */
+            pa_assert((areas[0].first >> 3) == 0);
+            pa_assert((areas[0].step >> 3) == u->frame_size);
+
+            p = (uint8_t*) areas[0].addr + (offset * u->frame_size);
+
+            chunk.memblock = pa_memblock_new_fixed(u->core->mempool, p, frames * u->frame_size, TRUE);
+            chunk.length = pa_memblock_get_length(chunk.memblock);
+            chunk.index = 0;
+
+            pa_sink_render_into_full(u->sink, &chunk);
+
+            /* FIXME: Maybe we can do something to keep this memory block
+             * a little bit longer around? */
+            pa_memblock_unref_fixed(chunk.memblock);
+
+            if (PA_UNLIKELY((sframes = snd_pcm_mmap_commit(u->pcm_handle, offset, frames)) < 0)) {
+
+                if ((r = try_recover(u, "snd_pcm_mmap_commit", (int) sframes)) == 0)
+                    continue;
+
+                return r;
+            }
+
+            work_done = 1;
+
+            u->frame_index += (int64_t) frames;
+            u->since_start += frames * u->frame_size;
+
+/*             pa_log_debug("wrote %lu frames", (unsigned long) frames); */
+
+            if (frames >= (snd_pcm_uframes_t) n)
+                break;
+
+            n -= (snd_pcm_sframes_t) frames;
+        }
+    }
+
+    *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec) - process_usec;
+    return work_done;
+}
+
+static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled) {
+    int work_done = 0;
+    pa_usec_t max_sleep_usec = 0, process_usec = 0;
+    size_t left_to_play;
+
+    pa_assert(u);
+    pa_sink_assert_ref(u->sink);
+
+    if (u->use_tsched)
+        hw_sleep_time(u, &max_sleep_usec, &process_usec);
+
+    for (;;) {
+        snd_pcm_sframes_t n;
+        int r;
+
+        snd_pcm_hwsync(u->pcm_handle);
+
+        if (PA_UNLIKELY((n = pa_alsa_safe_avail_update(u->pcm_handle, u->hwbuf_size, &u->sink->sample_spec)) < 0)) {
+
+            if ((r = try_recover(u, "snd_pcm_avail_update", (int) n)) == 0)
+                continue;
+
+            return r;
+        }
+
+        left_to_play = check_left_to_play(u, n);
+
+        if (u->use_tsched)
+
+            /* We won't fill up the playback buffer before at least
+            * half the sleep time is over because otherwise we might
+            * ask for more data from the clients then they expect. We
+            * need to guarantee that clients only have to keep around
+            * a single hw buffer length. */
+
+            if (!polled &&
+                pa_bytes_to_usec(left_to_play, &u->sink->sample_spec) > process_usec+max_sleep_usec/2)
+                break;
+
+        if (PA_UNLIKELY(n <= u->hwbuf_unused_frames)) {
+
+            if (polled)
+                pa_log("ALSA woke us up to write new data to the device, but there was actually nothing to write! "
+                       "Most likely this is an ALSA driver bug. Please report this issue to the ALSA developers. "
+                       "We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail_update() returned 0.");
+
+            break;
+        }
+
+        n -= u->hwbuf_unused_frames;
+
+        polled = FALSE;
+
+        for (;;) {
+            snd_pcm_sframes_t frames;
+            void *p;
+
+/*         pa_log_debug("%lu frames to write", (unsigned long) frames); */
+
+            if (u->memchunk.length <= 0)
+                pa_sink_render(u->sink, (size_t) n * u->frame_size, &u->memchunk);
+
+            pa_assert(u->memchunk.length > 0);
+
+            frames = (snd_pcm_sframes_t) (u->memchunk.length / u->frame_size);
+
+            if (frames > n)
+                frames = n;
+
+            p = pa_memblock_acquire(u->memchunk.memblock);
+            frames = snd_pcm_writei(u->pcm_handle, (const uint8_t*) p + u->memchunk.index, (snd_pcm_uframes_t) frames);
+            pa_memblock_release(u->memchunk.memblock);
+
+            pa_assert(frames != 0);
+
+            if (PA_UNLIKELY(frames < 0)) {
+
+                if ((r = try_recover(u, "snd_pcm_writei", (int) frames)) == 0)
+                    continue;
+
+                return r;
+            }
+
+            u->memchunk.index += (size_t) frames * u->frame_size;
+            u->memchunk.length -= (size_t) frames * u->frame_size;
+
+            if (u->memchunk.length <= 0) {
+                pa_memblock_unref(u->memchunk.memblock);
+                pa_memchunk_reset(&u->memchunk);
+            }
+
+            work_done = 1;
+
+            u->frame_index += frames;
+            u->since_start += (size_t) frames * u->frame_size;
+
+/*         pa_log_debug("wrote %lu frames", (unsigned long) frames); */
+
+            if (frames >= n)
+                break;
+
+            n -= frames;
+        }
+    }
+
+    *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec) - process_usec;
+    return work_done;
+}
+
+static void update_smoother(struct userdata *u) {
+    snd_pcm_sframes_t delay  = 0;
+    int64_t frames;
+    int err;
+    pa_usec_t now1, now2;
+/*     struct timeval timestamp; */
+    snd_pcm_status_t *status;
+
+    snd_pcm_status_alloca(&status);
+
+    pa_assert(u);
+    pa_assert(u->pcm_handle);
+
+    /* Let's update the time smoother */
+
+    snd_pcm_hwsync(u->pcm_handle);
+    snd_pcm_avail_update(u->pcm_handle);
+
+/*     if (PA_UNLIKELY((err = snd_pcm_status(u->pcm_handle, status)) < 0)) { */
+/*         pa_log("Failed to query DSP status data: %s", snd_strerror(err)); */
+/*         return; */
+/*     } */
+
+/*     delay = snd_pcm_status_get_delay(status); */
+
+    if (PA_UNLIKELY((err = snd_pcm_delay(u->pcm_handle, &delay)) < 0)) {
+        pa_log("Failed to query DSP status data: %s", snd_strerror(err));
+        return;
+    }
+
+    frames = u->frame_index - delay;
+
+/*     pa_log_debug("frame_index = %llu, delay = %llu, p = %llu", (unsigned long long) u->frame_index, (unsigned long long) delay, (unsigned long long) frames); */
+
+/*     snd_pcm_status_get_tstamp(status, &timestamp); */
+/*     pa_rtclock_from_wallclock(&timestamp); */
+/*     now1 = pa_timeval_load(&timestamp); */
+
+    now1 = pa_rtclock_usec();
+    now2 = pa_bytes_to_usec((uint64_t) frames * u->frame_size, &u->sink->sample_spec);
+    pa_smoother_put(u->smoother, now1, now2);
+}
+
+static pa_usec_t sink_get_latency(struct userdata *u) {
+    pa_usec_t r = 0;
+    int64_t delay;
+    pa_usec_t now1, now2;
+
+    pa_assert(u);
+
+    now1 = pa_rtclock_usec();
+    now2 = pa_smoother_get(u->smoother, now1);
+
+    delay = (int64_t) pa_bytes_to_usec((uint64_t) u->frame_index * u->frame_size, &u->sink->sample_spec) - (int64_t) now2;
+
+    if (delay > 0)
+        r = (pa_usec_t) delay;
+
+    if (u->memchunk.memblock)
+        r += pa_bytes_to_usec(u->memchunk.length, &u->sink->sample_spec);
+
+    return r;
+}
+
+static int build_pollfd(struct userdata *u) {
+    pa_assert(u);
+    pa_assert(u->pcm_handle);
+
+    if (u->alsa_rtpoll_item)
+        pa_rtpoll_item_free(u->alsa_rtpoll_item);
+
+    if (!(u->alsa_rtpoll_item = pa_alsa_build_pollfd(u->pcm_handle, u->rtpoll)))
+        return -1;
+
+    return 0;
+}
+
+static int suspend(struct userdata *u) {
+    pa_assert(u);
+    pa_assert(u->pcm_handle);
+
+    pa_smoother_pause(u->smoother, pa_rtclock_usec());
+
+    /* Let's suspend -- we don't call snd_pcm_drain() here since that might
+     * take awfully long with our long buffer sizes today. */
+    snd_pcm_close(u->pcm_handle);
+    u->pcm_handle = NULL;
+
+    if (u->alsa_rtpoll_item) {
+        pa_rtpoll_item_free(u->alsa_rtpoll_item);
+        u->alsa_rtpoll_item = NULL;
+    }
+
+    pa_log_info("Device suspended...");
+
+    return 0;
+}
+
+static int update_sw_params(struct userdata *u) {
+    snd_pcm_uframes_t avail_min;
+    int err;
+
+    pa_assert(u);
+
+    /* Use the full buffer if noone asked us for anything specific */
+    u->hwbuf_unused_frames = 0;
+
+    if (u->use_tsched) {
+        pa_usec_t latency;
+
+        if ((latency = pa_sink_get_requested_latency_within_thread(u->sink)) != (pa_usec_t) -1) {
+            size_t b;
+
+            pa_log_debug("latency set to %0.2fms", (double) latency / PA_USEC_PER_MSEC);
+
+            b = pa_usec_to_bytes(latency, &u->sink->sample_spec);
+
+            /* We need at least one sample in our buffer */
+
+            if (PA_UNLIKELY(b < u->frame_size))
+                b = u->frame_size;
+
+            u->hwbuf_unused_frames = (snd_pcm_sframes_t)
+                (PA_LIKELY(b < u->hwbuf_size) ?
+                 ((u->hwbuf_size - b) / u->frame_size) : 0);
+        }
+
+        fix_tsched_watermark(u);
+    }
+
+    pa_log_debug("hwbuf_unused_frames=%lu", (unsigned long) u->hwbuf_unused_frames);
+
+    /* We need at last one frame in the used part of the buffer */
+    avail_min = (snd_pcm_uframes_t) u->hwbuf_unused_frames + 1;
+
+    if (u->use_tsched) {
+        pa_usec_t sleep_usec, process_usec;
+
+        hw_sleep_time(u, &sleep_usec, &process_usec);
+        avail_min += pa_usec_to_bytes(sleep_usec, &u->sink->sample_spec) / u->frame_size;
+    }
+
+    pa_log_debug("setting avail_min=%lu", (unsigned long) avail_min);
+
+    if ((err = pa_alsa_set_sw_params(u->pcm_handle, avail_min)) < 0) {
+        pa_log("Failed to set software parameters: %s", snd_strerror(err));
+        return err;
+    }
+
+    pa_sink_set_max_request(u->sink, u->hwbuf_size - (size_t) u->hwbuf_unused_frames * u->frame_size);
+
+    return 0;
+}
+
+static int unsuspend(struct userdata *u) {
+    pa_sample_spec ss;
+    int err;
+    pa_bool_t b, d;
+    unsigned nfrags;
+    snd_pcm_uframes_t period_size;
+
+    pa_assert(u);
+    pa_assert(!u->pcm_handle);
+
+    pa_log_info("Trying resume...");
+
+    snd_config_update_free_global();
+    if ((err = snd_pcm_open(&u->pcm_handle, u->device_name, SND_PCM_STREAM_PLAYBACK,
+                            /*SND_PCM_NONBLOCK|*/
+                            SND_PCM_NO_AUTO_RESAMPLE|
+                            SND_PCM_NO_AUTO_CHANNELS|
+                            SND_PCM_NO_AUTO_FORMAT)) < 0) {
+        pa_log("Error opening PCM device %s: %s", u->device_name, snd_strerror(err));
+        goto fail;
+    }
+
+    ss = u->sink->sample_spec;
+    nfrags = u->nfragments;
+    period_size = u->fragment_size / u->frame_size;
+    b = u->use_mmap;
+    d = u->use_tsched;
+
+    if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, u->hwbuf_size / u->frame_size, &b, &d, TRUE)) < 0) {
+        pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
+        goto fail;
+    }
+
+    if (b != u->use_mmap || d != u->use_tsched) {
+        pa_log_warn("Resume failed, couldn't get original access mode.");
+        goto fail;
+    }
+
+    if (!pa_sample_spec_equal(&ss, &u->sink->sample_spec)) {
+        pa_log_warn("Resume failed, couldn't restore original sample settings.");
+        goto fail;
+    }
+
+    if (nfrags != u->nfragments || period_size*u->frame_size != u->fragment_size) {
+        pa_log_warn("Resume failed, couldn't restore original fragment settings. (Old: %lu*%lu, New %lu*%lu)",
+                    (unsigned long) u->nfragments, (unsigned long) u->fragment_size,
+                    (unsigned long) nfrags, period_size * u->frame_size);
+        goto fail;
+    }
+
+    if (update_sw_params(u) < 0)
+        goto fail;
+
+    if (build_pollfd(u) < 0)
+        goto fail;
+
+    /* FIXME: We need to reload the volume somehow */
+
+    u->first = TRUE;
+    u->since_start = 0;
+
+    pa_log_info("Resumed successfully...");
+
+    return 0;
+
+fail:
+    if (u->pcm_handle) {
+        snd_pcm_close(u->pcm_handle);
+        u->pcm_handle = NULL;
+    }
+
+    return -1;
+}
+
+static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
+    struct userdata *u = PA_SINK(o)->userdata;
+
+    switch (code) {
+
+        case PA_SINK_MESSAGE_GET_LATENCY: {
+            pa_usec_t r = 0;
+
+            if (u->pcm_handle)
+                r = sink_get_latency(u);
+
+            *((pa_usec_t*) data) = r;
+
+            return 0;
+        }
+
+        case PA_SINK_MESSAGE_SET_STATE:
+
+            switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {
+
+                case PA_SINK_SUSPENDED:
+                    pa_assert(PA_SINK_IS_OPENED(u->sink->thread_info.state));
+
+                    if (suspend(u) < 0)
+                        return -1;
+
+                    break;
+
+                case PA_SINK_IDLE:
+                case PA_SINK_RUNNING:
+
+                    if (u->sink->thread_info.state == PA_SINK_INIT) {
+                        if (build_pollfd(u) < 0)
+                            return -1;
+                    }
+
+                    if (u->sink->thread_info.state == PA_SINK_SUSPENDED) {
+                        if (unsuspend(u) < 0)
+                            return -1;
+                    }
+
+                    break;
+
+                case PA_SINK_UNLINKED:
+                case PA_SINK_INIT:
+                    ;
+            }
+
+            break;
+    }
+
+    return pa_sink_process_msg(o, code, data, offset, chunk);
+}
+
+static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
+    struct userdata *u = snd_mixer_elem_get_callback_private(elem);
+
+    pa_assert(u);
+    pa_assert(u->mixer_handle);
+
+    if (mask == SND_CTL_EVENT_MASK_REMOVE)
+        return 0;
+
+    if (mask & SND_CTL_EVENT_MASK_VALUE) {
+        pa_sink_get_volume(u->sink, TRUE);
+        pa_sink_get_mute(u->sink, TRUE);
+    }
+
+    return 0;
+}
+
+static pa_volume_t from_alsa_volume(struct userdata *u, long alsa_vol) {
+
+    return (pa_volume_t) round(((double) (alsa_vol - u->hw_volume_min) * PA_VOLUME_NORM) /
+                               (double) (u->hw_volume_max - u->hw_volume_min));
+}
+
+static long to_alsa_volume(struct userdata *u, pa_volume_t vol) {
+    long alsa_vol;
+
+    alsa_vol = (long) round(((double) vol * (double) (u->hw_volume_max - u->hw_volume_min))
+                            / PA_VOLUME_NORM) + u->hw_volume_min;
+
+    return PA_CLAMP_UNLIKELY(alsa_vol, u->hw_volume_min, u->hw_volume_max);
+}
+
+static int sink_get_volume_cb(pa_sink *s) {
+    struct userdata *u = s->userdata;
+    int err;
+    unsigned i;
+    pa_cvolume r;
+    char t[PA_CVOLUME_SNPRINT_MAX];
+
+    pa_assert(u);
+    pa_assert(u->mixer_elem);
+
+    if (u->mixer_seperate_channels) {
+
+        r.channels = s->sample_spec.channels;
+
+        for (i = 0; i < s->sample_spec.channels; i++) {
+            long alsa_vol;
+
+            if (u->hw_dB_supported) {
+
+                if ((err = snd_mixer_selem_get_playback_dB(u->mixer_elem, u->mixer_map[i], &alsa_vol)) < 0)
+                    goto fail;
+
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+                VALGRIND_MAKE_MEM_DEFINED(&alsa_vol, sizeof(alsa_vol));
+#endif
+
+                r.values[i] = pa_sw_volume_from_dB((double) (alsa_vol - u->hw_dB_max) / 100.0);
+            } else {
+
+                if ((err = snd_mixer_selem_get_playback_volume(u->mixer_elem, u->mixer_map[i], &alsa_vol)) < 0)
+                    goto fail;
+
+                r.values[i] = from_alsa_volume(u, alsa_vol);
+            }
+        }
+
+    } else {
+        long alsa_vol;
+
+        if (u->hw_dB_supported) {
+
+            if ((err = snd_mixer_selem_get_playback_dB(u->mixer_elem, SND_MIXER_SCHN_MONO, &alsa_vol)) < 0)
+                goto fail;
+
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+            VALGRIND_MAKE_MEM_DEFINED(&alsa_vol, sizeof(alsa_vol));
+#endif
+
+            pa_cvolume_set(&r, s->sample_spec.channels, pa_sw_volume_from_dB((double) (alsa_vol - u->hw_dB_max) / 100.0));
+
+        } else {
+
+            if ((err = snd_mixer_selem_get_playback_volume(u->mixer_elem, SND_MIXER_SCHN_MONO, &alsa_vol)) < 0)
+                goto fail;
+
+            pa_cvolume_set(&r, s->sample_spec.channels, from_alsa_volume(u, alsa_vol));
+        }
+    }
+
+    pa_log_debug("Read hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &r));
+
+    if (!pa_cvolume_equal(&u->hardware_volume, &r)) {
+
+        u->hardware_volume = s->volume = r;
+
+        if (u->hw_dB_supported) {
+            pa_cvolume reset;
+
+            /* Hmm, so the hardware volume changed, let's reset our software volume */
+
+            pa_cvolume_reset(&reset, s->sample_spec.channels);
+            pa_sink_set_soft_volume(s, &reset);
+        }
+    }
+
+    return 0;
+
+fail:
+    pa_log_error("Unable to read volume: %s", snd_strerror(err));
+
+    return -1;
+}
+
+static int sink_set_volume_cb(pa_sink *s) {
+    struct userdata *u = s->userdata;
+    int err;
+    unsigned i;
+    pa_cvolume r;
+
+    pa_assert(u);
+    pa_assert(u->mixer_elem);
+
+    if (u->mixer_seperate_channels) {
+
+        r.channels = s->sample_spec.channels;
+
+        for (i = 0; i < s->sample_spec.channels; i++) {
+            long alsa_vol;
+            pa_volume_t vol;
+
+            vol = s->volume.values[i];
+
+            if (u->hw_dB_supported) {
+
+                alsa_vol = (long) (pa_sw_volume_to_dB(vol) * 100);
+                alsa_vol += u->hw_dB_max;
+                alsa_vol = PA_CLAMP_UNLIKELY(alsa_vol, u->hw_dB_min, u->hw_dB_max);
+
+                if ((err = snd_mixer_selem_set_playback_dB(u->mixer_elem, u->mixer_map[i], alsa_vol, 1)) < 0)
+                    goto fail;
+
+                if ((err = snd_mixer_selem_get_playback_dB(u->mixer_elem, u->mixer_map[i], &alsa_vol)) < 0)
+                    goto fail;
+
+                r.values[i] = pa_sw_volume_from_dB((double) (alsa_vol - u->hw_dB_max) / 100.0);
+
+            } else {
+                alsa_vol = to_alsa_volume(u, vol);
+
+                if ((err = snd_mixer_selem_set_playback_volume(u->mixer_elem, u->mixer_map[i], alsa_vol)) < 0)
+                    goto fail;
+
+                if ((err = snd_mixer_selem_get_playback_volume(u->mixer_elem, u->mixer_map[i], &alsa_vol)) < 0)
+                    goto fail;
+
+                r.values[i] = from_alsa_volume(u, alsa_vol);
+            }
+        }
+
+    } else {
+        pa_volume_t vol;
+        long alsa_vol;
+
+        vol = pa_cvolume_max(&s->volume);
+
+        if (u->hw_dB_supported) {
+            alsa_vol = (long) (pa_sw_volume_to_dB(vol) * 100);
+            alsa_vol += u->hw_dB_max;
+            alsa_vol = PA_CLAMP_UNLIKELY(alsa_vol, u->hw_dB_min, u->hw_dB_max);
+
+            if ((err = snd_mixer_selem_set_playback_dB_all(u->mixer_elem, alsa_vol, 1)) < 0)
+                goto fail;
+
+            if ((err = snd_mixer_selem_get_playback_dB(u->mixer_elem, SND_MIXER_SCHN_MONO, &alsa_vol)) < 0)
+                goto fail;
+
+            pa_cvolume_set(&r, s->volume.channels, pa_sw_volume_from_dB((double) (alsa_vol - u->hw_dB_max) / 100.0));
+
+        } else {
+            alsa_vol = to_alsa_volume(u, vol);
+
+            if ((err = snd_mixer_selem_set_playback_volume_all(u->mixer_elem, alsa_vol)) < 0)
+                goto fail;
+
+            if ((err = snd_mixer_selem_get_playback_volume(u->mixer_elem, SND_MIXER_SCHN_MONO, &alsa_vol)) < 0)
+                goto fail;
+
+            pa_cvolume_set(&r, s->sample_spec.channels, from_alsa_volume(u, alsa_vol));
+        }
+    }
+
+    u->hardware_volume = r;
+
+    if (u->hw_dB_supported) {
+        char t[PA_CVOLUME_SNPRINT_MAX];
+
+        /* Match exactly what the user requested by software */
+
+        pa_sw_cvolume_divide(&r, &s->volume, &r);
+        pa_sink_set_soft_volume(s, &r);
+
+        pa_log_debug("Requested volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->volume));
+        pa_log_debug("Got hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &u->hardware_volume));
+        pa_log_debug("Calculated software volume: %s", pa_cvolume_snprint(t, sizeof(t), &r));
+
+    } else
+
+        /* We can't match exactly what the user requested, hence let's
+         * at least tell the user about it */
+
+        s->volume = r;
+
+    return 0;
+
+fail:
+    pa_log_error("Unable to set volume: %s", snd_strerror(err));
+
+    return -1;
+}
+
+static int sink_get_mute_cb(pa_sink *s) {
+    struct userdata *u = s->userdata;
+    int err, sw;
+
+    pa_assert(u);
+    pa_assert(u->mixer_elem);
+
+    if ((err = snd_mixer_selem_get_playback_switch(u->mixer_elem, 0, &sw)) < 0) {
+        pa_log_error("Unable to get switch: %s", snd_strerror(err));
+        return -1;
+    }
+
+    s->muted = !sw;
+
+    return 0;
+}
+
+static int sink_set_mute_cb(pa_sink *s) {
+    struct userdata *u = s->userdata;
+    int err;
+
+    pa_assert(u);
+    pa_assert(u->mixer_elem);
+
+    if ((err = snd_mixer_selem_set_playback_switch_all(u->mixer_elem, !s->muted)) < 0) {
+        pa_log_error("Unable to set switch: %s", snd_strerror(err));
+        return -1;
+    }
+
+    return 0;
+}
+
+static void sink_update_requested_latency_cb(pa_sink *s) {
+    struct userdata *u = s->userdata;
+    snd_pcm_sframes_t before;
+    pa_assert(u);
+
+    if (!u->pcm_handle)
+        return;
+
+    before = u->hwbuf_unused_frames;
+    update_sw_params(u);
+
+    /* Let's check whether we now use only a smaller part of the
+    buffer then before. If so, we need to make sure that subsequent
+    rewinds are relative to the new maxium fill level and not to the
+    current fill level. Thus, let's do a full rewind once, to clear
+    things up. */
+
+    if (u->hwbuf_unused_frames > before) {
+        pa_log_debug("Requesting rewind due to latency change.");
+        pa_sink_request_rewind(s, (size_t) -1);
+    }
+}
+
+static int process_rewind(struct userdata *u) {
+    snd_pcm_sframes_t unused;
+    size_t rewind_nbytes, unused_nbytes, limit_nbytes;
+    pa_assert(u);
+
+    /* Figure out how much we shall rewind and reset the counter */
+    rewind_nbytes = u->sink->thread_info.rewind_nbytes;
+    u->sink->thread_info.rewind_nbytes = 0;
+
+    if (rewind_nbytes <= 0)
+        goto finish;
+
+    pa_assert(rewind_nbytes > 0);
+    pa_log_debug("Requested to rewind %lu bytes.", (unsigned long) rewind_nbytes);
+
+    snd_pcm_hwsync(u->pcm_handle);
+    if ((unused = snd_pcm_avail_update(u->pcm_handle)) < 0) {
+        pa_log("snd_pcm_avail_update() failed: %s", snd_strerror((int) unused));
+        return -1;
+    }
+
+    unused_nbytes = u->tsched_watermark + (size_t) unused * u->frame_size;
+
+    if (u->hwbuf_size > unused_nbytes)
+        limit_nbytes = u->hwbuf_size - unused_nbytes;
+    else
+        limit_nbytes = 0;
+
+    if (rewind_nbytes > limit_nbytes)
+        rewind_nbytes = limit_nbytes;
+
+    if (rewind_nbytes > 0) {
+        snd_pcm_sframes_t in_frames, out_frames;
+
+        pa_log_debug("Limited to %lu bytes.", (unsigned long) rewind_nbytes);
+
+        in_frames = (snd_pcm_sframes_t) (rewind_nbytes / u->frame_size);
+        pa_log_debug("before: %lu", (unsigned long) in_frames);
+        if ((out_frames = snd_pcm_rewind(u->pcm_handle, (snd_pcm_uframes_t) in_frames)) < 0) {
+            pa_log("snd_pcm_rewind() failed: %s", snd_strerror((int) out_frames));
+            return -1;
+        }
+        pa_log_debug("after: %lu", (unsigned long) out_frames);
+
+        rewind_nbytes = (size_t) out_frames * u->frame_size;
+
+        if (rewind_nbytes <= 0)
+            pa_log_info("Tried rewind, but was apparently not possible.");
+        else {
+            u->frame_index -= out_frames;
+            pa_log_debug("Rewound %lu bytes.", (unsigned long) rewind_nbytes);
+            pa_sink_process_rewind(u->sink, rewind_nbytes);
+
+            u->after_rewind = TRUE;
+            return 0;
+        }
+    } else
+        pa_log_debug("Mhmm, actually there is nothing to rewind.");
+
+finish:
+
+    pa_sink_process_rewind(u->sink, 0);
+
+    return 0;
+
+}
+
+static void thread_func(void *userdata) {
+    struct userdata *u = userdata;
+    unsigned short revents = 0;
+
+    pa_assert(u);
+
+    pa_log_debug("Thread starting up");
+
+    if (u->core->realtime_scheduling)
+        pa_make_realtime(u->core->realtime_priority);
+
+    pa_thread_mq_install(&u->thread_mq);
+    pa_rtpoll_install(u->rtpoll);
+
+    for (;;) {
+        int ret;
+
+/*         pa_log_debug("loop"); */
+
+        /* Render some data and write it to the dsp */
+        if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
+            int work_done;
+            pa_usec_t sleep_usec = 0;
+
+            if (u->sink->thread_info.rewind_requested)
+                if (process_rewind(u) < 0)
+                        goto fail;
+
+            if (u->use_mmap)
+                work_done = mmap_write(u, &sleep_usec, revents & POLLOUT);
+            else
+                work_done = unix_write(u, &sleep_usec, revents & POLLOUT);
+
+            if (work_done < 0)
+                goto fail;
+
+/*             pa_log_debug("work_done = %i", work_done); */
+
+            if (work_done) {
+
+                if (u->first) {
+                    pa_log_info("Starting playback.");
+                    snd_pcm_start(u->pcm_handle);
+
+                    pa_smoother_resume(u->smoother, pa_rtclock_usec());
+                }
+
+                update_smoother(u);
+            }
+
+            if (u->use_tsched) {
+                pa_usec_t cusec;
+
+                if (u->since_start <= u->hwbuf_size) {
+
+                    /* USB devices on ALSA seem to hit a buffer
+                     * underrun during the first iterations much
+                     * quicker then we calculate here, probably due to
+                     * the transport latency. To accomodate for that
+                     * we artificially decrease the sleep time until
+                     * we have filled the buffer at least once
+                     * completely.*/
+
+                    /*pa_log_debug("Cutting sleep time for the initial iterations by half.");*/
+                    sleep_usec /= 2;
+                }
+
+                /* OK, the playback buffer is now full, let's
+                 * calculate when to wake up next */
+/*                 pa_log_debug("Waking up in %0.2fms (sound card clock).", (double) sleep_usec / PA_USEC_PER_MSEC); */
+
+                /* Convert from the sound card time domain to the
+                 * system time domain */
+                cusec = pa_smoother_translate(u->smoother, pa_rtclock_usec(), sleep_usec);
+
+/*                 pa_log_debug("Waking up in %0.2fms (system clock).", (double) cusec / PA_USEC_PER_MSEC); */
+
+                /* We don't trust the conversion, so we wake up whatever comes first */
+                pa_rtpoll_set_timer_relative(u->rtpoll, PA_MIN(sleep_usec, cusec));
+            }
+
+            u->first = FALSE;
+            u->after_rewind = FALSE;
+
+        } else if (u->use_tsched)
+
+            /* OK, we're in an invalid state, let's disable our timers */
+            pa_rtpoll_set_timer_disabled(u->rtpoll);
+
+        /* Hmm, nothing to do. Let's sleep */
+        if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
+            goto fail;
+
+        if (ret == 0)
+            goto finish;
+
+        /* Tell ALSA about this and process its response */
+        if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
+            struct pollfd *pollfd;
+            int err;
+            unsigned n;
+
+            pollfd = pa_rtpoll_item_get_pollfd(u->alsa_rtpoll_item, &n);
+
+            if ((err = snd_pcm_poll_descriptors_revents(u->pcm_handle, pollfd, n, &revents)) < 0) {
+                pa_log("snd_pcm_poll_descriptors_revents() failed: %s", snd_strerror(err));
+                goto fail;
+            }
+
+            if (revents & (POLLIN|POLLERR|POLLNVAL|POLLHUP|POLLPRI)) {
+                if (pa_alsa_recover_from_poll(u->pcm_handle, revents) < 0)
+                    goto fail;
+
+                u->first = TRUE;
+                u->since_start = 0;
+            }
+
+            if (revents && u->use_tsched)
+                pa_log_debug("Wakeup from ALSA!%s%s", (revents & POLLIN) ? " INPUT" : "", (revents & POLLOUT) ? " OUTPUT" : "");
+        } else
+            revents = 0;
+    }
+
+fail:
+    /* If this was no regular exit from the loop we have to continue
+     * processing messages until we received PA_MESSAGE_SHUTDOWN */
+    pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
+    pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
+
+finish:
+    pa_log_debug("Thread shutting down");
+}
+
+int pa__init(pa_module*m) {
+
+    pa_modargs *ma = NULL;
+    struct userdata *u = NULL;
+    const char *dev_id;
+    pa_sample_spec ss;
+    pa_channel_map map;
+    uint32_t nfrags, hwbuf_size, frag_size, tsched_size, tsched_watermark;
+    snd_pcm_uframes_t period_frames, tsched_frames;
+    size_t frame_size;
+    snd_pcm_info_t *pcm_info = NULL;
+    int err;
+    const char *name;
+    char *name_buf = NULL;
+    pa_bool_t namereg_fail;
+    pa_bool_t use_mmap = TRUE, b, use_tsched = TRUE, d;
+    pa_usec_t usec;
+    pa_sink_new_data data;
+
+    snd_pcm_info_alloca(&pcm_info);
+
+    pa_assert(m);
+
+    pa_alsa_redirect_errors_inc();
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log("Failed to parse module arguments");
+        goto fail;
+    }
+
+    ss = m->core->default_sample_spec;
+    if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
+        pa_log("Failed to parse sample specification and channel map");
+        goto fail;
+    }
+
+    frame_size = pa_frame_size(&ss);
+
+    nfrags = m->core->default_n_fragments;
+    frag_size = (uint32_t) pa_usec_to_bytes(m->core->default_fragment_size_msec*PA_USEC_PER_MSEC, &ss);
+    if (frag_size <= 0)
+        frag_size = (uint32_t) frame_size;
+    tsched_size = (uint32_t) pa_usec_to_bytes(DEFAULT_TSCHED_BUFFER_USEC, &ss);
+    tsched_watermark = (uint32_t) pa_usec_to_bytes(DEFAULT_TSCHED_WATERMARK_USEC, &ss);
+
+    if (pa_modargs_get_value_u32(ma, "fragments", &nfrags) < 0 ||
+        pa_modargs_get_value_u32(ma, "fragment_size", &frag_size) < 0 ||
+        pa_modargs_get_value_u32(ma, "tsched_buffer_size", &tsched_size) < 0 ||
+        pa_modargs_get_value_u32(ma, "tsched_buffer_watermark", &tsched_watermark) < 0) {
+        pa_log("Failed to parse buffer metrics");
+        goto fail;
+    }
+
+    hwbuf_size = frag_size * nfrags;
+    period_frames = frag_size/frame_size;
+    tsched_frames = tsched_size/frame_size;
+
+    if (pa_modargs_get_value_boolean(ma, "mmap", &use_mmap) < 0) {
+        pa_log("Failed to parse mmap argument.");
+        goto fail;
+    }
+
+    if (pa_modargs_get_value_boolean(ma, "tsched", &use_tsched) < 0) {
+        pa_log("Failed to parse tsched argument.");
+        goto fail;
+    }
+
+    if (use_tsched && !pa_rtclock_hrtimer()) {
+        pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel.");
+        use_tsched = FALSE;
+    }
+
+    u = pa_xnew0(struct userdata, 1);
+    u->core = m->core;
+    u->module = m;
+    m->userdata = u;
+    u->use_mmap = use_mmap;
+    u->use_tsched = use_tsched;
+    u->first = TRUE;
+    u->since_start = 0;
+    u->after_rewind = FALSE;
+    u->rtpoll = pa_rtpoll_new();
+    pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
+    u->alsa_rtpoll_item = NULL;
+
+    u->smoother = pa_smoother_new(DEFAULT_TSCHED_BUFFER_USEC*2, DEFAULT_TSCHED_BUFFER_USEC*2, TRUE, 5);
+    usec = pa_rtclock_usec();
+    pa_smoother_set_time_offset(u->smoother, usec);
+    pa_smoother_pause(u->smoother, usec);
+
+    snd_config_update_free_global();
+
+    b = use_mmap;
+    d = use_tsched;
+
+    if ((dev_id = pa_modargs_get_value(ma, "device_id", NULL))) {
+
+        if (!(u->pcm_handle = pa_alsa_open_by_device_id(
+                      dev_id,
+                      &u->device_name,
+                      &ss, &map,
+                      SND_PCM_STREAM_PLAYBACK,
+                      &nfrags, &period_frames, tsched_frames,
+                      &b, &d)))
+
+            goto fail;
+
+    } else {
+
+        if (!(u->pcm_handle = pa_alsa_open_by_device_string(
+                      pa_modargs_get_value(ma, "device", DEFAULT_DEVICE),
+                      &u->device_name,
+                      &ss, &map,
+                      SND_PCM_STREAM_PLAYBACK,
+                      &nfrags, &period_frames, tsched_frames,
+                      &b, &d)))
+            goto fail;
+
+    }
+
+    pa_assert(u->device_name);
+    pa_log_info("Successfully opened device %s.", u->device_name);
+
+    if (use_mmap && !b) {
+        pa_log_info("Device doesn't support mmap(), falling back to UNIX read/write mode.");
+        u->use_mmap = use_mmap = FALSE;
+    }
+
+    if (use_tsched && (!b || !d)) {
+        pa_log_info("Cannot enabled timer-based scheduling, falling back to sound IRQ scheduling.");
+        u->use_tsched = use_tsched = FALSE;
+    }
+
+    if (u->use_mmap)
+        pa_log_info("Successfully enabled mmap() mode.");
+
+    if (u->use_tsched)
+        pa_log_info("Successfully enabled timer-based scheduling mode.");
+
+    if ((err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
+        pa_log("Error fetching PCM info: %s", snd_strerror(err));
+        goto fail;
+    }
+
+    /* ALSA might tweak the sample spec, so recalculate the frame size */
+    frame_size = pa_frame_size(&ss);
+
+    if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0)
+        pa_log_warn("Error opening mixer: %s", snd_strerror(err));
+    else {
+        pa_bool_t found = FALSE;
+
+        if (pa_alsa_prepare_mixer(u->mixer_handle, u->device_name) >= 0)
+            found = TRUE;
+        else {
+            snd_pcm_info_t *info;
+
+            snd_pcm_info_alloca(&info);
+
+            if (snd_pcm_info(u->pcm_handle, info) >= 0) {
+                char *md;
+                int card;
+
+                if ((card = snd_pcm_info_get_card(info)) >= 0) {
+
+                    md = pa_sprintf_malloc("hw:%i", card);
+
+                    if (strcmp(u->device_name, md))
+                        if (pa_alsa_prepare_mixer(u->mixer_handle, md) >= 0)
+                            found = TRUE;
+                    pa_xfree(md);
+                }
+            }
+        }
+
+        if (found)
+            if (!(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Master", "PCM", TRUE)))
+                found = FALSE;
+
+        if (!found) {
+            snd_mixer_close(u->mixer_handle);
+            u->mixer_handle = NULL;
+        }
+    }
+
+    if ((name = pa_modargs_get_value(ma, "sink_name", NULL)))
+        namereg_fail = TRUE;
+    else {
+        name = name_buf = pa_sprintf_malloc("alsa_output.%s", u->device_name);
+        namereg_fail = FALSE;
+    }
+
+    pa_sink_new_data_init(&data);
+    data.driver = __FILE__;
+    data.module = m;
+    pa_sink_new_data_set_name(&data, name);
+    data.namereg_fail = namereg_fail;
+    pa_sink_new_data_set_sample_spec(&data, &ss);
+    pa_sink_new_data_set_channel_map(&data, &map);
+
+    pa_alsa_init_proplist(data.proplist, pcm_info);
+    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->device_name);
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_BUFFERING_BUFFER_SIZE, "%lu", (unsigned long) (period_frames * frame_size * nfrags));
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_BUFFERING_FRAGMENT_SIZE, "%lu", (unsigned long) (period_frames * frame_size));
+    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_ACCESS_MODE, u->use_tsched ? "mmap+timer" : (u->use_mmap ? "mmap" : "serial"));
+
+    u->sink = pa_sink_new(m->core, &data, PA_SINK_HARDWARE|PA_SINK_LATENCY);
+    pa_sink_new_data_done(&data);
+    pa_xfree(name_buf);
+
+    if (!u->sink) {
+        pa_log("Failed to create sink object");
+        goto fail;
+    }
+
+    u->sink->parent.process_msg = sink_process_msg;
+    u->sink->update_requested_latency = sink_update_requested_latency_cb;
+    u->sink->userdata = u;
+
+    pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
+    pa_sink_set_rtpoll(u->sink, u->rtpoll);
+
+    u->frame_size = frame_size;
+    u->fragment_size = frag_size = (uint32_t) (period_frames * frame_size);
+    u->nfragments = nfrags;
+    u->hwbuf_size = u->fragment_size * nfrags;
+    u->hwbuf_unused_frames = 0;
+    u->tsched_watermark = tsched_watermark;
+    u->frame_index = 0;
+    u->hw_dB_supported = FALSE;
+    u->hw_dB_min = u->hw_dB_max = 0;
+    u->hw_volume_min = u->hw_volume_max = 0;
+    u->mixer_seperate_channels = FALSE;
+    pa_cvolume_mute(&u->hardware_volume, u->sink->sample_spec.channels);
+
+    if (use_tsched)
+        fix_tsched_watermark(u);
+
+    u->sink->thread_info.max_rewind = use_tsched ? u->hwbuf_size : 0;
+    u->sink->thread_info.max_request = u->hwbuf_size;
+
+    pa_sink_set_latency_range(u->sink,
+                              !use_tsched ? pa_bytes_to_usec(u->hwbuf_size, &ss) : (pa_usec_t) -1,
+                              pa_bytes_to_usec(u->hwbuf_size, &ss));
+
+    pa_log_info("Using %u fragments of size %lu bytes, buffer time is %0.2fms",
+                nfrags, (long unsigned) u->fragment_size,
+                (double) pa_bytes_to_usec(u->hwbuf_size, &ss) / PA_USEC_PER_MSEC);
+
+    if (use_tsched)
+        pa_log_info("Time scheduling watermark is %0.2fms",
+                    (double) pa_bytes_to_usec(u->tsched_watermark, &ss) / PA_USEC_PER_MSEC);
+
+    if (update_sw_params(u) < 0)
+        goto fail;
+
+    pa_memchunk_reset(&u->memchunk);
+
+    if (u->mixer_handle) {
+        pa_assert(u->mixer_elem);
+
+        if (snd_mixer_selem_has_playback_volume(u->mixer_elem)) {
+            pa_bool_t suitable = FALSE;
+
+            if (snd_mixer_selem_get_playback_volume_range(u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max) < 0)
+                pa_log_info("Failed to get volume range. Falling back to software volume control.");
+            else if (u->hw_volume_min >= u->hw_volume_max)
+                pa_log_warn("Your kernel driver is broken: it reports a volume range from %li to %li which makes no sense.", u->hw_volume_min, u->hw_volume_max);
+            else {
+                pa_log_info("Volume ranges from %li to %li.", u->hw_volume_min, u->hw_volume_max);
+                suitable = TRUE;
+            }
+
+            if (suitable) {
+                if (snd_mixer_selem_get_playback_dB_range(u->mixer_elem, &u->hw_dB_min, &u->hw_dB_max) < 0)
+                    pa_log_info("Mixer doesn't support dB information.");
+                else {
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+                    VALGRIND_MAKE_MEM_DEFINED(&u->hw_dB_min, sizeof(u->hw_dB_min));
+                    VALGRIND_MAKE_MEM_DEFINED(&u->hw_dB_max, sizeof(u->hw_dB_max));
+#endif
+
+                    if (u->hw_dB_min >= u->hw_dB_max)
+                        pa_log_warn("Your kernel driver is broken: it reports a volume range from %0.2f dB to %0.2f dB which makes no sense.", (double) u->hw_dB_min/100.0, (double) u->hw_dB_max/100.0);
+                    else {
+                        pa_log_info("Volume ranges from %0.2f dB to %0.2f dB.", (double) u->hw_dB_min/100.0, (double) u->hw_dB_max/100.0);
+                        u->hw_dB_supported = TRUE;
+
+                        if (u->hw_dB_max > 0) {
+                            u->sink->base_volume = pa_sw_volume_from_dB(- (double) u->hw_dB_max/100.0);
+                            pa_log_info("Fixing base volume to %0.2f dB", pa_sw_volume_to_dB(u->sink->base_volume));
+                        } else
+                            pa_log_info("No particular base volume set, fixing to 0 dB");
+                    }
+                }
+
+                if (!u->hw_dB_supported &&
+                    u->hw_volume_max - u->hw_volume_min < 3) {
+
+                    pa_log_info("Device doesn't do dB volume and has less than 4 volume levels. Falling back to software volume control.");
+                    suitable = FALSE;
+                }
+            }
+
+            if (suitable) {
+                u->mixer_seperate_channels = pa_alsa_calc_mixer_map(u->mixer_elem, &map, u->mixer_map, TRUE) >= 0;
+
+                u->sink->get_volume = sink_get_volume_cb;
+                u->sink->set_volume = sink_set_volume_cb;
+                u->sink->flags |= PA_SINK_HW_VOLUME_CTRL | (u->hw_dB_supported ? PA_SINK_DECIBEL_VOLUME : 0);
+                pa_log_info("Using hardware volume control. Hardware dB scale %s.", u->hw_dB_supported ? "supported" : "not supported");
+
+            } else
+                pa_log_info("Using software volume control.");
+        }
+
+        if (snd_mixer_selem_has_playback_switch(u->mixer_elem)) {
+            u->sink->get_mute = sink_get_mute_cb;
+            u->sink->set_mute = sink_set_mute_cb;
+            u->sink->flags |= PA_SINK_HW_MUTE_CTRL;
+        } else
+            pa_log_info("Using software mute control.");
+
+        u->mixer_fdl = pa_alsa_fdlist_new();
+
+        if (pa_alsa_fdlist_set_mixer(u->mixer_fdl, u->mixer_handle, m->core->mainloop) < 0) {
+            pa_log("Failed to initialize file descriptor monitoring");
+            goto fail;
+        }
+
+        snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
+        snd_mixer_elem_set_callback_private(u->mixer_elem, u);
+    } else
+        u->mixer_fdl = NULL;
+
+    pa_alsa_dump(u->pcm_handle);
+
+    if (!(u->thread = pa_thread_new(thread_func, u))) {
+        pa_log("Failed to create thread.");
+        goto fail;
+    }
+
+    /* Get initial mixer settings */
+    if (data.volume_is_set) {
+        if (u->sink->set_volume)
+            u->sink->set_volume(u->sink);
+    } else {
+        if (u->sink->get_volume)
+            u->sink->get_volume(u->sink);
+    }
+
+    if (data.muted_is_set) {
+        if (u->sink->set_mute)
+            u->sink->set_mute(u->sink);
+    } else {
+        if (u->sink->get_mute)
+            u->sink->get_mute(u->sink);
+    }
+
+    pa_sink_put(u->sink);
+
+    pa_modargs_free(ma);
+
+    return 0;
+
+fail:
+
+    if (ma)
+        pa_modargs_free(ma);
+
+    pa__done(m);
+
+    return -1;
+}
+
+int pa__get_n_used(pa_module *m) {
+    struct userdata *u;
+
+    pa_assert(m);
+    pa_assert_se(u = m->userdata);
+
+    return pa_sink_linked_by(u->sink);
+}
+
+void pa__done(pa_module*m) {
+    struct userdata *u;
+
+    pa_assert(m);
+
+    if (!(u = m->userdata)) {
+        pa_alsa_redirect_errors_dec();
+        return;
+    }
+
+    if (u->sink)
+        pa_sink_unlink(u->sink);
+
+    if (u->thread) {
+        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
+        pa_thread_free(u->thread);
+    }
+
+    pa_thread_mq_done(&u->thread_mq);
+
+    if (u->sink)
+        pa_sink_unref(u->sink);
+
+    if (u->memchunk.memblock)
+        pa_memblock_unref(u->memchunk.memblock);
+
+    if (u->alsa_rtpoll_item)
+        pa_rtpoll_item_free(u->alsa_rtpoll_item);
+
+    if (u->rtpoll)
+        pa_rtpoll_free(u->rtpoll);
+
+    if (u->mixer_fdl)
+        pa_alsa_fdlist_free(u->mixer_fdl);
+
+    if (u->mixer_handle)
+        snd_mixer_close(u->mixer_handle);
+
+    if (u->pcm_handle) {
+        snd_pcm_drop(u->pcm_handle);
+        snd_pcm_close(u->pcm_handle);
+    }
+
+    if (u->smoother)
+        pa_smoother_free(u->smoother);
+
+    pa_xfree(u->device_name);
+    pa_xfree(u);
+
+    snd_config_update_free_global();
+
+    pa_alsa_redirect_errors_dec();
+}
diff --git a/src/modules/alsa/module-alsa-source.c b/src/modules/alsa/module-alsa-source.c
new file mode 100644
index 00000000..901db01f
--- /dev/null
+++ b/src/modules/alsa/module-alsa-source.c
@@ -0,0 +1,1491 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2008 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+
+#include <asoundlib.h>
+
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+#include <valgrind/memcheck.h>
+#endif
+
+#include <pulse/xmalloc.h>
+#include <pulse/util.h>
+#include <pulse/timeval.h>
+
+#include <pulsecore/core-error.h>
+#include <pulsecore/core.h>
+#include <pulsecore/module.h>
+#include <pulsecore/memchunk.h>
+#include <pulsecore/sink.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/sample-util.h>
+#include <pulsecore/log.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/core-error.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
+#include <pulsecore/time-smoother.h>
+#include <pulsecore/rtclock.h>
+
+#include "alsa-util.h"
+#include "module-alsa-source-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering");
+PA_MODULE_DESCRIPTION("ALSA Source");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(FALSE);
+PA_MODULE_USAGE(
+        "source_name=<name for the source> "
+        "device=<ALSA device> "
+        "device_id=<ALSA card index> "
+        "format=<sample format> "
+        "rate=<sample rate> "
+        "channels=<number of channels> "
+        "channel_map=<channel map> "
+        "fragments=<number of fragments> "
+        "fragment_size=<fragment size> "
+        "mmap=<enable memory mapping?> "
+        "tsched=<enable system timer based scheduling mode?> "
+        "tsched_buffer_size=<buffer size when using timer based scheduling> "
+        "tsched_buffer_watermark=<upper fill watermark>");
+
+static const char* const valid_modargs[] = {
+    "source_name",
+    "device",
+    "device_id",
+    "format",
+    "rate",
+    "channels",
+    "channel_map",
+    "fragments",
+    "fragment_size",
+    "mmap",
+    "tsched",
+    "tsched_buffer_size",
+    "tsched_buffer_watermark",
+    NULL
+};
+
+#define DEFAULT_DEVICE "default"
+#define DEFAULT_TSCHED_BUFFER_USEC (2*PA_USEC_PER_SEC)       /* 2s */
+#define DEFAULT_TSCHED_WATERMARK_USEC (20*PA_USEC_PER_MSEC)  /* 20ms */
+#define TSCHED_MIN_SLEEP_USEC (3*PA_USEC_PER_MSEC)           /* 3ms */
+#define TSCHED_MIN_WAKEUP_USEC (3*PA_USEC_PER_MSEC)          /* 3ms */
+
+struct userdata {
+    pa_core *core;
+    pa_module *module;
+    pa_source *source;
+
+    pa_thread *thread;
+    pa_thread_mq thread_mq;
+    pa_rtpoll *rtpoll;
+
+    snd_pcm_t *pcm_handle;
+
+    pa_alsa_fdlist *mixer_fdl;
+    snd_mixer_t *mixer_handle;
+    snd_mixer_elem_t *mixer_elem;
+    long hw_volume_max, hw_volume_min;
+    long hw_dB_max, hw_dB_min;
+    pa_bool_t hw_dB_supported;
+    pa_bool_t mixer_seperate_channels;
+
+    pa_cvolume hardware_volume;
+
+    size_t frame_size, fragment_size, hwbuf_size, tsched_watermark;
+    unsigned nfragments;
+
+    char *device_name;
+
+    pa_bool_t use_mmap, use_tsched;
+
+    pa_rtpoll_item *alsa_rtpoll_item;
+
+    snd_mixer_selem_channel_id_t mixer_map[SND_MIXER_SCHN_LAST];
+
+    pa_smoother *smoother;
+    int64_t frame_index;
+
+    snd_pcm_sframes_t hwbuf_unused_frames;
+};
+
+static void fix_tsched_watermark(struct userdata *u) {
+    size_t max_use;
+    size_t min_sleep, min_wakeup;
+    pa_assert(u);
+
+    max_use = u->hwbuf_size - (size_t) u->hwbuf_unused_frames * u->frame_size;
+
+    min_sleep = pa_usec_to_bytes(TSCHED_MIN_SLEEP_USEC, &u->source->sample_spec);
+    min_wakeup = pa_usec_to_bytes(TSCHED_MIN_WAKEUP_USEC, &u->source->sample_spec);
+
+    if (min_sleep > max_use/2)
+        min_sleep = pa_frame_align(max_use/2, &u->source->sample_spec);
+    if (min_sleep < u->frame_size)
+        min_sleep = u->frame_size;
+
+    if (min_wakeup > max_use/2)
+        min_wakeup = pa_frame_align(max_use/2, &u->source->sample_spec);
+    if (min_wakeup < u->frame_size)
+        min_wakeup = u->frame_size;
+
+    if (u->tsched_watermark > max_use-min_sleep)
+        u->tsched_watermark = max_use-min_sleep;
+
+    if (u->tsched_watermark < min_wakeup)
+        u->tsched_watermark = min_wakeup;
+}
+
+static pa_usec_t hw_sleep_time(struct userdata *u, pa_usec_t *sleep_usec, pa_usec_t*process_usec) {
+    pa_usec_t wm, usec;
+
+    pa_assert(u);
+
+    usec = pa_source_get_requested_latency_within_thread(u->source);
+
+    if (usec == (pa_usec_t) -1)
+        usec = pa_bytes_to_usec(u->hwbuf_size, &u->source->sample_spec);
+
+/*     pa_log_debug("hw buffer time: %u ms", (unsigned) (usec / PA_USEC_PER_MSEC)); */
+
+    wm = pa_bytes_to_usec(u->tsched_watermark, &u->source->sample_spec);
+
+    if (usec >= wm) {
+        *sleep_usec = usec - wm;
+        *process_usec = wm;
+    } else
+        *process_usec = *sleep_usec = usec /= 2;
+
+/*     pa_log_debug("after watermark: %u ms", (unsigned) (*sleep_usec / PA_USEC_PER_MSEC)); */
+
+    return usec;
+}
+
+static int try_recover(struct userdata *u, const char *call, int err) {
+    pa_assert(u);
+    pa_assert(call);
+    pa_assert(err < 0);
+
+    pa_log_debug("%s: %s", call, snd_strerror(err));
+
+    pa_assert(err != -EAGAIN);
+
+    if (err == -EPIPE)
+        pa_log_debug("%s: Buffer overrun!", call);
+
+    if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0) {
+        snd_pcm_start(u->pcm_handle);
+        return 0;
+    }
+
+    pa_log("%s: %s", call, snd_strerror(err));
+    return -1;
+}
+
+static size_t check_left_to_record(struct userdata *u, snd_pcm_sframes_t n) {
+    size_t left_to_record;
+    size_t rec_space = u->hwbuf_size - (size_t) u->hwbuf_unused_frames*u->frame_size;
+
+    if ((size_t) n*u->frame_size < rec_space)
+        left_to_record = rec_space - ((size_t) n*u->frame_size);
+    else
+        left_to_record = 0;
+
+    if (left_to_record > 0) {
+/*         pa_log_debug("%0.2f ms left to record", (double) pa_bytes_to_usec(left_to_record, &u->source->sample_spec) / PA_USEC_PER_MSEC); */
+    } else {
+        pa_log_info("Overrun!");
+
+        if (u->use_tsched) {
+            size_t old_watermark = u->tsched_watermark;
+
+            u->tsched_watermark *= 2;
+            fix_tsched_watermark(u);
+
+            if (old_watermark != u->tsched_watermark)
+                pa_log_notice("Increasing wakeup watermark to %0.2f ms",
+                              (double) pa_bytes_to_usec(u->tsched_watermark, &u->source->sample_spec) / PA_USEC_PER_MSEC);
+        }
+    }
+
+    return left_to_record;
+}
+
+static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled) {
+    int work_done = 0;
+    pa_usec_t max_sleep_usec = 0, process_usec = 0;
+    size_t left_to_record;
+
+    pa_assert(u);
+    pa_source_assert_ref(u->source);
+
+    if (u->use_tsched)
+        hw_sleep_time(u, &max_sleep_usec, &process_usec);
+
+    for (;;) {
+        snd_pcm_sframes_t n;
+        int r;
+
+        snd_pcm_hwsync(u->pcm_handle);
+
+        if (PA_UNLIKELY((n = pa_alsa_safe_avail_update(u->pcm_handle, u->hwbuf_size, &u->source->sample_spec)) < 0)) {
+
+            if ((r = try_recover(u, "snd_pcm_avail_update", (int) n)) == 0)
+                continue;
+
+            return r;
+        }
+
+        left_to_record = check_left_to_record(u, n);
+
+        if (u->use_tsched)
+            if (!polled &&
+                pa_bytes_to_usec(left_to_record, &u->source->sample_spec) > process_usec+max_sleep_usec/2)
+                break;
+
+        if (PA_UNLIKELY(n <= 0)) {
+
+            if (polled)
+                pa_log("ALSA woke us up to read new data from the device, but there was actually nothing to read! "
+                       "Most likely this is an ALSA driver bug. Please report this issue to the ALSA developers. "
+                       "We were woken up with POLLIN set -- however a subsequent snd_pcm_avail_update() returned 0.");
+
+            break;
+        }
+
+        polled = FALSE;
+
+        for (;;) {
+            int err;
+            const snd_pcm_channel_area_t *areas;
+            snd_pcm_uframes_t offset, frames = (snd_pcm_uframes_t) n;
+            pa_memchunk chunk;
+            void *p;
+            snd_pcm_sframes_t sframes;
+
+/*             pa_log_debug("%lu frames to read", (unsigned long) frames); */
+
+            if (PA_UNLIKELY((err = pa_alsa_safe_mmap_begin(u->pcm_handle, &areas, &offset, &frames, u->hwbuf_size, &u->source->sample_spec)) < 0)) {
+
+                if ((r = try_recover(u, "snd_pcm_mmap_begin", err)) == 0)
+                    continue;
+
+                return r;
+            }
+
+            /* Make sure that if these memblocks need to be copied they will fit into one slot */
+            if (frames > pa_mempool_block_size_max(u->source->core->mempool)/u->frame_size)
+                frames = pa_mempool_block_size_max(u->source->core->mempool)/u->frame_size;
+
+            /* Check these are multiples of 8 bit */
+            pa_assert((areas[0].first & 7) == 0);
+            pa_assert((areas[0].step & 7)== 0);
+
+            /* We assume a single interleaved memory buffer */
+            pa_assert((areas[0].first >> 3) == 0);
+            pa_assert((areas[0].step >> 3) == u->frame_size);
+
+            p = (uint8_t*) areas[0].addr + (offset * u->frame_size);
+
+            chunk.memblock = pa_memblock_new_fixed(u->core->mempool, p, frames * u->frame_size, TRUE);
+            chunk.length = pa_memblock_get_length(chunk.memblock);
+            chunk.index = 0;
+
+            pa_source_post(u->source, &chunk);
+            pa_memblock_unref_fixed(chunk.memblock);
+
+            if (PA_UNLIKELY((sframes = snd_pcm_mmap_commit(u->pcm_handle, offset, frames)) < 0)) {
+
+                if ((r = try_recover(u, "snd_pcm_mmap_commit", (int) sframes)) == 0)
+                    continue;
+
+                return r;
+            }
+
+            work_done = 1;
+
+            u->frame_index += (int64_t) frames;
+
+/*             pa_log_debug("read %lu frames", (unsigned long) frames); */
+
+            if (frames >= (snd_pcm_uframes_t) n)
+                break;
+
+            n -= (snd_pcm_sframes_t) frames;
+        }
+    }
+
+    *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec) - process_usec;
+    return work_done;
+}
+
+static int unix_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled) {
+    int work_done = 0;
+    pa_usec_t max_sleep_usec = 0, process_usec = 0;
+    size_t left_to_record;
+
+    pa_assert(u);
+    pa_source_assert_ref(u->source);
+
+    if (u->use_tsched)
+        hw_sleep_time(u, &max_sleep_usec, &process_usec);
+
+    for (;;) {
+        snd_pcm_sframes_t n;
+        int r;
+
+        snd_pcm_hwsync(u->pcm_handle);
+
+        if (PA_UNLIKELY((n = pa_alsa_safe_avail_update(u->pcm_handle, u->hwbuf_size, &u->source->sample_spec)) < 0)) {
+
+            if ((r = try_recover(u, "snd_pcm_avail_update", (int) n)) == 0)
+                continue;
+
+            return r;
+        }
+
+        left_to_record = check_left_to_record(u, n);
+
+        if (u->use_tsched)
+            if (!polled &&
+                pa_bytes_to_usec(left_to_record, &u->source->sample_spec) > process_usec+max_sleep_usec/2)
+                break;
+
+        if (PA_UNLIKELY(n <= 0)) {
+
+            if (polled)
+                pa_log("ALSA woke us up to read new data from the device, but there was actually nothing to read! "
+                       "Most likely this is an ALSA driver bug. Please report this issue to the ALSA developers. "
+                       "We were woken up with POLLIN set -- however a subsequent snd_pcm_avail_update() returned 0.");
+
+            return work_done;
+        }
+
+        polled = FALSE;
+
+        for (;;) {
+            void *p;
+            snd_pcm_sframes_t frames;
+            pa_memchunk chunk;
+
+            chunk.memblock = pa_memblock_new(u->core->mempool, (size_t) -1);
+
+            frames = (snd_pcm_sframes_t) (pa_memblock_get_length(chunk.memblock) / u->frame_size);
+
+            if (frames > n)
+                frames = n;
+
+/*             pa_log_debug("%lu frames to read", (unsigned long) n); */
+
+            p = pa_memblock_acquire(chunk.memblock);
+            frames = snd_pcm_readi(u->pcm_handle, (uint8_t*) p, (snd_pcm_uframes_t) frames);
+            pa_memblock_release(chunk.memblock);
+
+            pa_assert(frames != 0);
+
+            if (PA_UNLIKELY(frames < 0)) {
+                pa_memblock_unref(chunk.memblock);
+
+                if ((r = try_recover(u, "snd_pcm_readi", (int) (frames))) == 0)
+                    continue;
+
+                return r;
+            }
+
+            chunk.index = 0;
+            chunk.length = (size_t) frames * u->frame_size;
+
+            pa_source_post(u->source, &chunk);
+            pa_memblock_unref(chunk.memblock);
+
+            work_done = 1;
+
+            u->frame_index += frames;
+
+/*             pa_log_debug("read %lu frames", (unsigned long) frames); */
+
+            if (frames >= n)
+                break;
+
+            n -= frames;
+        }
+    }
+
+    *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec) - process_usec;
+    return work_done;
+}
+
+static void update_smoother(struct userdata *u) {
+    snd_pcm_sframes_t delay = 0;
+    int64_t frames;
+    int err;
+    pa_usec_t now1, now2;
+
+    pa_assert(u);
+    pa_assert(u->pcm_handle);
+
+    /* Let's update the time smoother */
+
+    snd_pcm_hwsync(u->pcm_handle);
+    snd_pcm_avail_update(u->pcm_handle);
+
+    if (PA_UNLIKELY((err = snd_pcm_delay(u->pcm_handle, &delay)) < 0)) {
+        pa_log_warn("Failed to get delay: %s", snd_strerror(err));
+        return;
+    }
+
+    frames = u->frame_index + delay;
+
+    now1 = pa_rtclock_usec();
+    now2 = pa_bytes_to_usec((uint64_t) frames * u->frame_size, &u->source->sample_spec);
+
+    pa_smoother_put(u->smoother, now1, now2);
+}
+
+static pa_usec_t source_get_latency(struct userdata *u) {
+    pa_usec_t r = 0;
+    int64_t delay;
+    pa_usec_t now1, now2;
+
+    pa_assert(u);
+
+    now1 = pa_rtclock_usec();
+    now2 = pa_smoother_get(u->smoother, now1);
+
+    delay = (int64_t) now2 - (int64_t) pa_bytes_to_usec((uint64_t) u->frame_index * u->frame_size, &u->source->sample_spec);
+
+    if (delay > 0)
+        r = (pa_usec_t) delay;
+
+    return r;
+}
+
+static int build_pollfd(struct userdata *u) {
+    pa_assert(u);
+    pa_assert(u->pcm_handle);
+
+    if (u->alsa_rtpoll_item)
+        pa_rtpoll_item_free(u->alsa_rtpoll_item);
+
+    if (!(u->alsa_rtpoll_item = pa_alsa_build_pollfd(u->pcm_handle, u->rtpoll)))
+        return -1;
+
+    return 0;
+}
+
+static int suspend(struct userdata *u) {
+    pa_assert(u);
+    pa_assert(u->pcm_handle);
+
+    pa_smoother_pause(u->smoother, pa_rtclock_usec());
+
+    /* Let's suspend */
+    snd_pcm_close(u->pcm_handle);
+    u->pcm_handle = NULL;
+
+    if (u->alsa_rtpoll_item) {
+        pa_rtpoll_item_free(u->alsa_rtpoll_item);
+        u->alsa_rtpoll_item = NULL;
+    }
+
+    pa_log_info("Device suspended...");
+
+    return 0;
+}
+
+static int update_sw_params(struct userdata *u) {
+    snd_pcm_uframes_t avail_min;
+    int err;
+
+    pa_assert(u);
+
+    /* Use the full buffer if noone asked us for anything specific */
+    u->hwbuf_unused_frames = 0;
+
+    if (u->use_tsched) {
+        pa_usec_t latency;
+
+        if ((latency = pa_source_get_requested_latency_within_thread(u->source)) != (pa_usec_t) -1) {
+            size_t b;
+
+            pa_log_debug("latency set to %0.2fms", (double) latency / PA_USEC_PER_MSEC);
+
+            b = pa_usec_to_bytes(latency, &u->source->sample_spec);
+
+            /* We need at least one sample in our buffer */
+
+            if (PA_UNLIKELY(b < u->frame_size))
+                b = u->frame_size;
+
+            u->hwbuf_unused_frames = (snd_pcm_sframes_t)
+                (PA_LIKELY(b < u->hwbuf_size) ?
+                 ((u->hwbuf_size - b) / u->frame_size) : 0);
+        }
+
+        fix_tsched_watermark(u);
+    }
+
+    pa_log_debug("hwbuf_unused_frames=%lu", (unsigned long) u->hwbuf_unused_frames);
+
+    avail_min = 1;
+
+    if (u->use_tsched) {
+        pa_usec_t sleep_usec, process_usec;
+
+        hw_sleep_time(u, &sleep_usec, &process_usec);
+        avail_min += pa_usec_to_bytes(sleep_usec, &u->source->sample_spec) / u->frame_size;
+    }
+
+    pa_log_debug("setting avail_min=%lu", (unsigned long) avail_min);
+
+    if ((err = pa_alsa_set_sw_params(u->pcm_handle, avail_min)) < 0) {
+        pa_log("Failed to set software parameters: %s", snd_strerror(err));
+        return err;
+    }
+
+    return 0;
+}
+
+static int unsuspend(struct userdata *u) {
+    pa_sample_spec ss;
+    int err;
+    pa_bool_t b, d;
+    unsigned nfrags;
+    snd_pcm_uframes_t period_size;
+
+    pa_assert(u);
+    pa_assert(!u->pcm_handle);
+
+    pa_log_info("Trying resume...");
+
+    snd_config_update_free_global();
+
+    if ((err = snd_pcm_open(&u->pcm_handle, u->device_name, SND_PCM_STREAM_CAPTURE,
+                            /*SND_PCM_NONBLOCK|*/
+                            SND_PCM_NO_AUTO_RESAMPLE|
+                            SND_PCM_NO_AUTO_CHANNELS|
+                            SND_PCM_NO_AUTO_FORMAT)) < 0) {
+        pa_log("Error opening PCM device %s: %s", u->device_name, snd_strerror(err));
+        goto fail;
+    }
+
+    ss = u->source->sample_spec;
+    nfrags = u->nfragments;
+    period_size = u->fragment_size / u->frame_size;
+    b = u->use_mmap;
+    d = u->use_tsched;
+
+    if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, u->hwbuf_size / u->frame_size, &b, &d, TRUE)) < 0) {
+        pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
+        goto fail;
+    }
+
+    if (b != u->use_mmap || d != u->use_tsched) {
+        pa_log_warn("Resume failed, couldn't get original access mode.");
+        goto fail;
+    }
+
+    if (!pa_sample_spec_equal(&ss, &u->source->sample_spec)) {
+        pa_log_warn("Resume failed, couldn't restore original sample settings.");
+        goto fail;
+    }
+
+    if (nfrags != u->nfragments || period_size*u->frame_size != u->fragment_size) {
+        pa_log_warn("Resume failed, couldn't restore original fragment settings. (Old: %lu*%lu, New %lu*%lu)",
+                    (unsigned long) u->nfragments, (unsigned long) u->fragment_size,
+                    (unsigned long) nfrags, period_size * u->frame_size);
+        goto fail;
+    }
+
+    if (update_sw_params(u) < 0)
+        goto fail;
+
+    if (build_pollfd(u) < 0)
+        goto fail;
+
+    /* FIXME: We need to reload the volume somehow */
+
+    snd_pcm_start(u->pcm_handle);
+    pa_smoother_resume(u->smoother, pa_rtclock_usec());
+
+    pa_log_info("Resumed successfully...");
+
+    return 0;
+
+fail:
+    if (u->pcm_handle) {
+        snd_pcm_close(u->pcm_handle);
+        u->pcm_handle = NULL;
+    }
+
+    return -1;
+}
+
+static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
+    struct userdata *u = PA_SOURCE(o)->userdata;
+
+    switch (code) {
+
+        case PA_SOURCE_MESSAGE_GET_LATENCY: {
+            pa_usec_t r = 0;
+
+            if (u->pcm_handle)
+                r = source_get_latency(u);
+
+            *((pa_usec_t*) data) = r;
+
+            return 0;
+        }
+
+        case PA_SOURCE_MESSAGE_SET_STATE:
+
+            switch ((pa_source_state_t) PA_PTR_TO_UINT(data)) {
+
+                case PA_SOURCE_SUSPENDED:
+                    pa_assert(PA_SOURCE_IS_OPENED(u->source->thread_info.state));
+
+                    if (suspend(u) < 0)
+                        return -1;
+
+                    break;
+
+                case PA_SOURCE_IDLE:
+                case PA_SOURCE_RUNNING:
+
+                    if (u->source->thread_info.state == PA_SOURCE_INIT) {
+                        if (build_pollfd(u) < 0)
+                            return -1;
+
+                        snd_pcm_start(u->pcm_handle);
+                    }
+
+                    if (u->source->thread_info.state == PA_SOURCE_SUSPENDED) {
+                        if (unsuspend(u) < 0)
+                            return -1;
+                    }
+
+                    break;
+
+                case PA_SOURCE_UNLINKED:
+                case PA_SOURCE_INIT:
+                    ;
+            }
+
+            break;
+    }
+
+    return pa_source_process_msg(o, code, data, offset, chunk);
+}
+
+static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
+    struct userdata *u = snd_mixer_elem_get_callback_private(elem);
+
+    pa_assert(u);
+    pa_assert(u->mixer_handle);
+
+    if (mask == SND_CTL_EVENT_MASK_REMOVE)
+        return 0;
+
+    if (mask & SND_CTL_EVENT_MASK_VALUE) {
+        pa_source_get_volume(u->source, TRUE);
+        pa_source_get_mute(u->source, TRUE);
+    }
+
+    return 0;
+}
+
+static pa_volume_t from_alsa_volume(struct userdata *u, long alsa_vol) {
+
+    return (pa_volume_t) round(((double) (alsa_vol - u->hw_volume_min) * PA_VOLUME_NORM) /
+                               (double) (u->hw_volume_max - u->hw_volume_min));
+}
+
+static long to_alsa_volume(struct userdata *u, pa_volume_t vol) {
+    long alsa_vol;
+
+    alsa_vol = (long) round(((double) vol * (double) (u->hw_volume_max - u->hw_volume_min))
+                            / PA_VOLUME_NORM) + u->hw_volume_min;
+
+    return PA_CLAMP_UNLIKELY(alsa_vol, u->hw_volume_min, u->hw_volume_max);
+}
+
+static int source_get_volume_cb(pa_source *s) {
+    struct userdata *u = s->userdata;
+    int err;
+    unsigned i;
+    pa_cvolume r;
+    char t[PA_CVOLUME_SNPRINT_MAX];
+
+    pa_assert(u);
+    pa_assert(u->mixer_elem);
+
+    if (u->mixer_seperate_channels) {
+
+        r.channels = s->sample_spec.channels;
+
+        for (i = 0; i < s->sample_spec.channels; i++) {
+            long alsa_vol;
+
+            if (u->hw_dB_supported) {
+
+                if ((err = snd_mixer_selem_get_capture_dB(u->mixer_elem, u->mixer_map[i], &alsa_vol)) < 0)
+                    goto fail;
+
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+                VALGRIND_MAKE_MEM_DEFINED(&alsa_vol, sizeof(alsa_vol));
+#endif
+
+                r.values[i] = pa_sw_volume_from_dB((double) (alsa_vol - u->hw_dB_max) / 100.0);
+            } else {
+
+                if ((err = snd_mixer_selem_get_capture_volume(u->mixer_elem, u->mixer_map[i], &alsa_vol)) < 0)
+                    goto fail;
+
+                r.values[i] = from_alsa_volume(u, alsa_vol);
+            }
+        }
+
+    } else {
+        long alsa_vol;
+
+        if (u->hw_dB_supported) {
+
+            if ((err = snd_mixer_selem_get_capture_dB(u->mixer_elem, SND_MIXER_SCHN_MONO, &alsa_vol)) < 0)
+                goto fail;
+
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+            VALGRIND_MAKE_MEM_DEFINED(&alsa_vol, sizeof(alsa_vol));
+#endif
+
+            pa_cvolume_set(&r, s->sample_spec.channels, pa_sw_volume_from_dB((double) (alsa_vol - u->hw_dB_max) / 100.0));
+
+        } else {
+
+            if ((err = snd_mixer_selem_get_capture_volume(u->mixer_elem, SND_MIXER_SCHN_MONO, &alsa_vol)) < 0)
+                goto fail;
+
+            pa_cvolume_set(&r, s->sample_spec.channels, from_alsa_volume(u, alsa_vol));
+        }
+    }
+
+    pa_log_debug("Read hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &r));
+
+    if (!pa_cvolume_equal(&u->hardware_volume, &r)) {
+
+        u->hardware_volume = s->volume = r;
+
+        if (u->hw_dB_supported) {
+            pa_cvolume reset;
+
+            /* Hmm, so the hardware volume changed, let's reset our software volume */
+
+            pa_cvolume_reset(&reset, s->sample_spec.channels);
+            pa_source_set_soft_volume(s, &reset);
+        }
+    }
+
+    return 0;
+
+fail:
+    pa_log_error("Unable to read volume: %s", snd_strerror(err));
+
+    return -1;
+}
+
+static int source_set_volume_cb(pa_source *s) {
+    struct userdata *u = s->userdata;
+    int err;
+    unsigned i;
+    pa_cvolume r;
+
+    pa_assert(u);
+    pa_assert(u->mixer_elem);
+
+    if (u->mixer_seperate_channels) {
+
+        r.channels = s->sample_spec.channels;
+
+        for (i = 0; i < s->sample_spec.channels; i++) {
+            long alsa_vol;
+            pa_volume_t vol;
+
+            vol = s->volume.values[i];
+
+            if (u->hw_dB_supported) {
+
+                alsa_vol = (long) (pa_sw_volume_to_dB(vol) * 100);
+                alsa_vol += u->hw_dB_max;
+                alsa_vol = PA_CLAMP_UNLIKELY(alsa_vol, u->hw_dB_min, u->hw_dB_max);
+
+                if ((err = snd_mixer_selem_set_capture_dB(u->mixer_elem, u->mixer_map[i], alsa_vol, 1)) < 0)
+                    goto fail;
+
+                if ((err = snd_mixer_selem_get_capture_dB(u->mixer_elem, u->mixer_map[i], &alsa_vol)) < 0)
+                    goto fail;
+
+                r.values[i] = pa_sw_volume_from_dB((double) (alsa_vol - u->hw_dB_max) / 100.0);
+
+            } else {
+                alsa_vol = to_alsa_volume(u, vol);
+
+                if ((err = snd_mixer_selem_set_capture_volume(u->mixer_elem, u->mixer_map[i], alsa_vol)) < 0)
+                    goto fail;
+
+                if ((err = snd_mixer_selem_get_capture_volume(u->mixer_elem, u->mixer_map[i], &alsa_vol)) < 0)
+                    goto fail;
+
+                r.values[i] = from_alsa_volume(u, alsa_vol);
+            }
+        }
+
+    } else {
+        pa_volume_t vol;
+        long alsa_vol;
+
+        vol = pa_cvolume_max(&s->volume);
+
+        if (u->hw_dB_supported) {
+            alsa_vol = (long) (pa_sw_volume_to_dB(vol) * 100);
+            alsa_vol += u->hw_dB_max;
+            alsa_vol = PA_CLAMP_UNLIKELY(alsa_vol, u->hw_dB_min, u->hw_dB_max);
+
+            if ((err = snd_mixer_selem_set_capture_dB_all(u->mixer_elem, alsa_vol, 1)) < 0)
+                goto fail;
+
+            if ((err = snd_mixer_selem_get_capture_dB(u->mixer_elem, SND_MIXER_SCHN_MONO, &alsa_vol)) < 0)
+                goto fail;
+
+            pa_cvolume_set(&r, s->volume.channels, pa_sw_volume_from_dB((double) (alsa_vol - u->hw_dB_max) / 100.0));
+
+        } else {
+            alsa_vol = to_alsa_volume(u, vol);
+
+            if ((err = snd_mixer_selem_set_capture_volume_all(u->mixer_elem, alsa_vol)) < 0)
+                goto fail;
+
+            if ((err = snd_mixer_selem_get_capture_volume(u->mixer_elem, SND_MIXER_SCHN_MONO, &alsa_vol)) < 0)
+                goto fail;
+
+            pa_cvolume_set(&r, s->sample_spec.channels, from_alsa_volume(u, alsa_vol));
+        }
+    }
+
+    u->hardware_volume = r;
+
+    if (u->hw_dB_supported) {
+        char t[PA_CVOLUME_SNPRINT_MAX];
+
+        /* Match exactly what the user requested by software */
+
+        pa_sw_cvolume_divide(&r, &s->volume, &r);
+        pa_source_set_soft_volume(s, &r);
+
+        pa_log_debug("Requested volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->volume));
+        pa_log_debug("Got hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &u->hardware_volume));
+        pa_log_debug("Calculated software volume: %s", pa_cvolume_snprint(t, sizeof(t), &r));
+
+    } else
+
+        /* We can't match exactly what the user requested, hence let's
+         * at least tell the user about it */
+
+        s->volume = r;
+
+    return 0;
+
+fail:
+    pa_log_error("Unable to set volume: %s", snd_strerror(err));
+
+    return -1;
+}
+
+static int source_get_mute_cb(pa_source *s) {
+    struct userdata *u = s->userdata;
+    int err, sw;
+
+    pa_assert(u);
+    pa_assert(u->mixer_elem);
+
+    if ((err = snd_mixer_selem_get_capture_switch(u->mixer_elem, 0, &sw)) < 0) {
+        pa_log_error("Unable to get switch: %s", snd_strerror(err));
+        return -1;
+    }
+
+    s->muted = !sw;
+
+    return 0;
+}
+
+static int source_set_mute_cb(pa_source *s) {
+    struct userdata *u = s->userdata;
+    int err;
+
+    pa_assert(u);
+    pa_assert(u->mixer_elem);
+
+    if ((err = snd_mixer_selem_set_capture_switch_all(u->mixer_elem, !s->muted)) < 0) {
+        pa_log_error("Unable to set switch: %s", snd_strerror(err));
+        return -1;
+    }
+
+    return 0;
+}
+
+static void source_update_requested_latency_cb(pa_source *s) {
+    struct userdata *u = s->userdata;
+    pa_assert(u);
+
+    if (!u->pcm_handle)
+        return;
+
+    update_sw_params(u);
+}
+
+static void thread_func(void *userdata) {
+    struct userdata *u = userdata;
+    unsigned short revents = 0;
+
+    pa_assert(u);
+
+    pa_log_debug("Thread starting up");
+
+    if (u->core->realtime_scheduling)
+        pa_make_realtime(u->core->realtime_priority);
+
+    pa_thread_mq_install(&u->thread_mq);
+    pa_rtpoll_install(u->rtpoll);
+
+    for (;;) {
+        int ret;
+
+/*         pa_log_debug("loop"); */
+
+        /* Read some data and pass it to the sources */
+        if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
+            int work_done = 0;
+            pa_usec_t sleep_usec = 0;
+
+            if (u->use_mmap)
+                work_done = mmap_read(u, &sleep_usec, revents & POLLIN);
+            else
+                work_done = unix_read(u, &sleep_usec, revents & POLLIN);
+
+            if (work_done < 0)
+                goto fail;
+
+/*             pa_log_debug("work_done = %i", work_done); */
+
+            if (work_done)
+                update_smoother(u);
+
+            if (u->use_tsched) {
+                pa_usec_t cusec;
+
+                /* OK, the capture buffer is now empty, let's
+                 * calculate when to wake up next */
+
+/*                 pa_log_debug("Waking up in %0.2fms (sound card clock).", (double) sleep_usec / PA_USEC_PER_MSEC); */
+
+                /* Convert from the sound card time domain to the
+                 * system time domain */
+                cusec = pa_smoother_translate(u->smoother, pa_rtclock_usec(), sleep_usec);
+
+/*                 pa_log_debug("Waking up in %0.2fms (system clock).", (double) cusec / PA_USEC_PER_MSEC); */
+
+                /* We don't trust the conversion, so we wake up whatever comes first */
+                pa_rtpoll_set_timer_relative(u->rtpoll, PA_MIN(sleep_usec, cusec));
+            }
+        } else if (u->use_tsched)
+
+            /* OK, we're in an invalid state, let's disable our timers */
+            pa_rtpoll_set_timer_disabled(u->rtpoll);
+
+        /* Hmm, nothing to do. Let's sleep */
+        if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
+            goto fail;
+
+        if (ret == 0)
+            goto finish;
+
+        /* Tell ALSA about this and process its response */
+        if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
+            struct pollfd *pollfd;
+            int err;
+            unsigned n;
+
+            pollfd = pa_rtpoll_item_get_pollfd(u->alsa_rtpoll_item, &n);
+
+            if ((err = snd_pcm_poll_descriptors_revents(u->pcm_handle, pollfd, n, &revents)) < 0) {
+                pa_log("snd_pcm_poll_descriptors_revents() failed: %s", snd_strerror(err));
+                goto fail;
+            }
+
+            if (revents & (POLLOUT|POLLERR|POLLNVAL|POLLHUP|POLLPRI)) {
+                if (pa_alsa_recover_from_poll(u->pcm_handle, revents) < 0)
+                    goto fail;
+
+                snd_pcm_start(u->pcm_handle);
+            }
+
+            if (revents && u->use_tsched)
+                pa_log_debug("Wakeup from ALSA!%s%s", (revents & POLLIN) ? " INPUT" : "", (revents & POLLOUT) ? " OUTPUT" : "");
+        } else
+            revents = 0;
+    }
+
+fail:
+    /* If this was no regular exit from the loop we have to continue
+     * processing messages until we received PA_MESSAGE_SHUTDOWN */
+    pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
+    pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
+
+finish:
+    pa_log_debug("Thread shutting down");
+}
+
+int pa__init(pa_module*m) {
+
+    pa_modargs *ma = NULL;
+    struct userdata *u = NULL;
+    const char *dev_id;
+    pa_sample_spec ss;
+    pa_channel_map map;
+    uint32_t nfrags, hwbuf_size, frag_size, tsched_size, tsched_watermark;
+    snd_pcm_uframes_t period_frames, tsched_frames;
+    size_t frame_size;
+    snd_pcm_info_t *pcm_info = NULL;
+    int err;
+    const char *name;
+    char *name_buf = NULL;
+    pa_bool_t namereg_fail;
+    pa_bool_t use_mmap = TRUE, b, use_tsched = TRUE, d;
+    pa_source_new_data data;
+
+    snd_pcm_info_alloca(&pcm_info);
+
+    pa_assert(m);
+
+    pa_alsa_redirect_errors_inc();
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log("Failed to parse module arguments");
+        goto fail;
+    }
+
+    ss = m->core->default_sample_spec;
+    if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
+        pa_log("Failed to parse sample specification");
+        goto fail;
+    }
+
+    frame_size = pa_frame_size(&ss);
+
+    nfrags = m->core->default_n_fragments;
+    frag_size = (uint32_t) pa_usec_to_bytes(m->core->default_fragment_size_msec*PA_USEC_PER_MSEC, &ss);
+    if (frag_size <= 0)
+        frag_size = (uint32_t) frame_size;
+    tsched_size = (uint32_t) pa_usec_to_bytes(DEFAULT_TSCHED_BUFFER_USEC, &ss);
+    tsched_watermark = (uint32_t) pa_usec_to_bytes(DEFAULT_TSCHED_WATERMARK_USEC, &ss);
+
+    if (pa_modargs_get_value_u32(ma, "fragments", &nfrags) < 0 ||
+        pa_modargs_get_value_u32(ma, "fragment_size", &frag_size) < 0 ||
+        pa_modargs_get_value_u32(ma, "tsched_buffer_size", &tsched_size) < 0 ||
+        pa_modargs_get_value_u32(ma, "tsched_buffer_watermark", &tsched_watermark) < 0) {
+        pa_log("Failed to parse buffer metrics");
+        goto fail;
+    }
+
+    hwbuf_size = frag_size * nfrags;
+    period_frames = frag_size/frame_size;
+    tsched_frames = tsched_size/frame_size;
+
+    if (pa_modargs_get_value_boolean(ma, "mmap", &use_mmap) < 0) {
+        pa_log("Failed to parse mmap argument.");
+        goto fail;
+    }
+
+    if (pa_modargs_get_value_boolean(ma, "tsched", &use_tsched) < 0) {
+        pa_log("Failed to parse timer_scheduling argument.");
+        goto fail;
+    }
+
+    if (use_tsched && !pa_rtclock_hrtimer()) {
+        pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel.");
+        use_tsched = FALSE;
+    }
+
+    u = pa_xnew0(struct userdata, 1);
+    u->core = m->core;
+    u->module = m;
+    m->userdata = u;
+    u->use_mmap = use_mmap;
+    u->use_tsched = use_tsched;
+    u->rtpoll = pa_rtpoll_new();
+    pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
+    u->alsa_rtpoll_item = NULL;
+
+    u->smoother = pa_smoother_new(DEFAULT_TSCHED_WATERMARK_USEC, DEFAULT_TSCHED_WATERMARK_USEC, TRUE, 5);
+    pa_smoother_set_time_offset(u->smoother, pa_rtclock_usec());
+
+    snd_config_update_free_global();
+
+    b = use_mmap;
+    d = use_tsched;
+
+    if ((dev_id = pa_modargs_get_value(ma, "device_id", NULL))) {
+
+        if (!(u->pcm_handle = pa_alsa_open_by_device_id(
+                      dev_id,
+                      &u->device_name,
+                      &ss, &map,
+                      SND_PCM_STREAM_CAPTURE,
+                      &nfrags, &period_frames, tsched_frames,
+                      &b, &d)))
+            goto fail;
+
+    } else {
+
+        if (!(u->pcm_handle = pa_alsa_open_by_device_string(
+                      pa_modargs_get_value(ma, "device", DEFAULT_DEVICE),
+                      &u->device_name,
+                      &ss, &map,
+                      SND_PCM_STREAM_CAPTURE,
+                      &nfrags, &period_frames, tsched_frames,
+                      &b, &d)))
+            goto fail;
+    }
+
+    pa_assert(u->device_name);
+    pa_log_info("Successfully opened device %s.", u->device_name);
+
+    if (use_mmap && !b) {
+        pa_log_info("Device doesn't support mmap(), falling back to UNIX read/write mode.");
+        u->use_mmap = use_mmap = FALSE;
+    }
+
+    if (use_tsched && (!b || !d)) {
+        pa_log_info("Cannot enabled timer-based scheduling, falling back to sound IRQ scheduling.");
+        u->use_tsched = use_tsched = FALSE;
+    }
+
+    if (u->use_mmap)
+        pa_log_info("Successfully enabled mmap() mode.");
+
+    if (u->use_tsched)
+        pa_log_info("Successfully enabled timer-based scheduling mode.");
+
+    if ((err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
+        pa_log("Error fetching PCM info: %s", snd_strerror(err));
+        goto fail;
+    }
+
+    /* ALSA might tweak the sample spec, so recalculate the frame size */
+    frame_size = pa_frame_size(&ss);
+
+    if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0)
+        pa_log("Error opening mixer: %s", snd_strerror(err));
+    else {
+        pa_bool_t found = FALSE;
+
+        if (pa_alsa_prepare_mixer(u->mixer_handle, u->device_name) >= 0)
+            found = TRUE;
+        else {
+            snd_pcm_info_t* info;
+
+            snd_pcm_info_alloca(&info);
+
+            if (snd_pcm_info(u->pcm_handle, info) >= 0) {
+                char *md;
+                int card;
+
+                if ((card = snd_pcm_info_get_card(info)) >= 0) {
+
+                    md = pa_sprintf_malloc("hw:%i", card);
+
+                    if (strcmp(u->device_name, md))
+                        if (pa_alsa_prepare_mixer(u->mixer_handle, md) >= 0)
+                            found = TRUE;
+                    pa_xfree(md);
+                }
+            }
+        }
+
+        if (found)
+            if (!(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Capture", "Mic", FALSE)))
+                found = FALSE;
+
+        if (!found) {
+            snd_mixer_close(u->mixer_handle);
+            u->mixer_handle = NULL;
+        }
+    }
+
+    if ((name = pa_modargs_get_value(ma, "source_name", NULL)))
+        namereg_fail = TRUE;
+    else {
+        name = name_buf = pa_sprintf_malloc("alsa_input.%s", u->device_name);
+        namereg_fail = FALSE;
+    }
+
+    pa_source_new_data_init(&data);
+    data.driver = __FILE__;
+    data.module = m;
+    pa_source_new_data_set_name(&data, name);
+    data.namereg_fail = namereg_fail;
+    pa_source_new_data_set_sample_spec(&data, &ss);
+    pa_source_new_data_set_channel_map(&data, &map);
+
+    pa_alsa_init_proplist(data.proplist, pcm_info);
+    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->device_name);
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_BUFFERING_BUFFER_SIZE, "%lu", (unsigned long) (period_frames * frame_size * nfrags));
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_BUFFERING_FRAGMENT_SIZE, "%lu", (unsigned long) (period_frames * frame_size));
+    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_ACCESS_MODE, u->use_tsched ? "mmap+timer" : (u->use_mmap ? "mmap" : "serial"));
+
+    u->source = pa_source_new(m->core, &data, PA_SOURCE_HARDWARE|PA_SOURCE_LATENCY);
+    pa_source_new_data_done(&data);
+    pa_xfree(name_buf);
+
+    if (!u->source) {
+        pa_log("Failed to create source object");
+        goto fail;
+    }
+
+    u->source->parent.process_msg = source_process_msg;
+    u->source->update_requested_latency = source_update_requested_latency_cb;
+    u->source->userdata = u;
+
+    pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
+    pa_source_set_rtpoll(u->source, u->rtpoll);
+
+    u->frame_size = frame_size;
+    u->fragment_size = frag_size = (uint32_t) (period_frames * frame_size);
+    u->nfragments = nfrags;
+    u->hwbuf_size = u->fragment_size * nfrags;
+    u->hwbuf_unused_frames = 0;
+    u->tsched_watermark = tsched_watermark;
+    u->frame_index = 0;
+    u->hw_dB_supported = FALSE;
+    u->hw_dB_min = u->hw_dB_max = 0;
+    u->hw_volume_min = u->hw_volume_max = 0;
+    u->mixer_seperate_channels = FALSE;
+    pa_cvolume_mute(&u->hardware_volume, u->source->sample_spec.channels);
+
+    if (use_tsched)
+        fix_tsched_watermark(u);
+
+    pa_source_set_latency_range(u->source,
+                                !use_tsched ? pa_bytes_to_usec(u->hwbuf_size, &ss) : (pa_usec_t) -1,
+                                pa_bytes_to_usec(u->hwbuf_size, &ss));
+
+    pa_log_info("Using %u fragments of size %lu bytes, buffer time is %0.2fms",
+                nfrags, (long unsigned) u->fragment_size,
+                (double) pa_bytes_to_usec(u->hwbuf_size, &ss) / PA_USEC_PER_MSEC);
+
+    if (use_tsched)
+        pa_log_info("Time scheduling watermark is %0.2fms",
+                    (double) pa_bytes_to_usec(u->tsched_watermark, &ss) / PA_USEC_PER_MSEC);
+
+    if (update_sw_params(u) < 0)
+        goto fail;
+
+    if (u->mixer_handle) {
+        pa_assert(u->mixer_elem);
+
+        if (snd_mixer_selem_has_capture_volume(u->mixer_elem)) {
+            pa_bool_t suitable = FALSE;
+
+            if (snd_mixer_selem_get_capture_volume_range(u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max) < 0)
+                pa_log_info("Failed to get volume range. Falling back to software volume control.");
+            else if (u->hw_volume_min >= u->hw_volume_max)
+                pa_log_warn("Your kernel driver is broken: it reports a volume range from %li to %li which makes no sense.", u->hw_volume_min, u->hw_volume_max);
+            else {
+                pa_log_info("Volume ranges from %li to %li.", u->hw_volume_min, u->hw_volume_max);
+                suitable = TRUE;
+            }
+
+            if (suitable) {
+                if (snd_mixer_selem_get_capture_dB_range(u->mixer_elem, &u->hw_dB_min, &u->hw_dB_max) < 0)
+                    pa_log_info("Mixer doesn't support dB information.");
+                else {
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+                    VALGRIND_MAKE_MEM_DEFINED(&u->hw_dB_min, sizeof(u->hw_dB_min));
+                    VALGRIND_MAKE_MEM_DEFINED(&u->hw_dB_max, sizeof(u->hw_dB_max));
+#endif
+
+                    if (u->hw_dB_min >= u->hw_dB_max)
+                        pa_log_warn("Your kernel driver is broken: it reports a volume range from %0.2f dB to %0.2f dB which makes no sense.", (double) u->hw_dB_min/100.0, (double) u->hw_dB_max/100.0);
+                    else {
+                        pa_log_info("Volume ranges from %0.2f dB to %0.2f dB.", (double) u->hw_dB_min/100.0, (double) u->hw_dB_max/100.0);
+                        u->hw_dB_supported = TRUE;
+
+                        if (u->hw_dB_max > 0) {
+                            u->source->base_volume = pa_sw_volume_from_dB(- (double) u->hw_dB_max/100.0);
+                            pa_log_info("Fixing base volume to %0.2f dB", pa_sw_volume_to_dB(u->source->base_volume));
+                        } else
+                            pa_log_info("No particular base volume set, fixing to 0 dB");
+
+                    }
+                }
+
+                if (!u->hw_dB_supported &&
+                    u->hw_volume_max - u->hw_volume_min < 3) {
+
+                    pa_log_info("Device has less than 4 volume levels. Falling back to software volume control.");
+                    suitable = FALSE;
+                }
+            }
+
+            if (suitable) {
+                u->mixer_seperate_channels = pa_alsa_calc_mixer_map(u->mixer_elem, &map, u->mixer_map, FALSE) >= 0;
+
+                u->source->get_volume = source_get_volume_cb;
+                u->source->set_volume = source_set_volume_cb;
+                u->source->flags |= PA_SOURCE_HW_VOLUME_CTRL | (u->hw_dB_supported ? PA_SOURCE_DECIBEL_VOLUME : 0);
+                pa_log_info("Using hardware volume control. Hardware dB scale %s.", u->hw_dB_supported ? "supported" : "not supported");
+            } else
+                pa_log_info("Using software volume control.");
+        }
+
+        if (snd_mixer_selem_has_capture_switch(u->mixer_elem)) {
+            u->source->get_mute = source_get_mute_cb;
+            u->source->set_mute = source_set_mute_cb;
+            u->source->flags |= PA_SOURCE_HW_MUTE_CTRL;
+        } else
+            pa_log_info("Using software mute control.");
+
+        u->mixer_fdl = pa_alsa_fdlist_new();
+
+        if (pa_alsa_fdlist_set_mixer(u->mixer_fdl, u->mixer_handle, m->core->mainloop) < 0) {
+            pa_log("Failed to initialize file descriptor monitoring");
+            goto fail;
+        }
+
+        snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
+        snd_mixer_elem_set_callback_private(u->mixer_elem, u);
+    } else
+        u->mixer_fdl = NULL;
+
+    pa_alsa_dump(u->pcm_handle);
+
+    if (!(u->thread = pa_thread_new(thread_func, u))) {
+        pa_log("Failed to create thread.");
+        goto fail;
+    }
+    /* Get initial mixer settings */
+    if (data.volume_is_set) {
+        if (u->source->set_volume)
+            u->source->set_volume(u->source);
+    } else {
+        if (u->source->get_volume)
+            u->source->get_volume(u->source);
+    }
+
+    if (data.muted_is_set) {
+        if (u->source->set_mute)
+            u->source->set_mute(u->source);
+    } else {
+        if (u->source->get_mute)
+            u->source->get_mute(u->source);
+    }
+
+    pa_source_put(u->source);
+
+    pa_modargs_free(ma);
+
+    return 0;
+
+fail:
+
+    if (ma)
+        pa_modargs_free(ma);
+
+    pa__done(m);
+
+    return -1;
+}
+
+int pa__get_n_used(pa_module *m) {
+    struct userdata *u;
+
+    pa_assert(m);
+    pa_assert_se(u = m->userdata);
+
+    return pa_source_linked_by(u->source);
+}
+
+void pa__done(pa_module*m) {
+    struct userdata *u;
+
+    pa_assert(m);
+
+    if (!(u = m->userdata)) {
+        pa_alsa_redirect_errors_dec();
+        return;
+    }
+
+    if (u->source)
+        pa_source_unlink(u->source);
+
+    if (u->thread) {
+        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
+        pa_thread_free(u->thread);
+    }
+
+    pa_thread_mq_done(&u->thread_mq);
+
+    if (u->source)
+        pa_source_unref(u->source);
+
+    if (u->alsa_rtpoll_item)
+        pa_rtpoll_item_free(u->alsa_rtpoll_item);
+
+    if (u->rtpoll)
+        pa_rtpoll_free(u->rtpoll);
+
+    if (u->mixer_fdl)
+        pa_alsa_fdlist_free(u->mixer_fdl);
+
+    if (u->mixer_handle)
+        snd_mixer_close(u->mixer_handle);
+
+    if (u->pcm_handle) {
+        snd_pcm_drop(u->pcm_handle);
+        snd_pcm_close(u->pcm_handle);
+    }
+
+    if (u->smoother)
+        pa_smoother_free(u->smoother);
+
+    pa_xfree(u->device_name);
+    pa_xfree(u);
+
+    snd_config_update_free_global();
+    pa_alsa_redirect_errors_dec();
+}