really create glitch-free branch

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/glitch-free@2120 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 989 insertions, 0 deletions

diff --git a/src/pulsecore/sink-input.c b/src/pulsecore/sink-input.c
new file mode 100644
index 00000000..07ddb83a
--- /dev/null
+++ b/src/pulsecore/sink-input.c
@@ -0,0 +1,989 @@
+/* $Id$ */
+
+/***
+  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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <pulse/utf8.h>
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/sample-util.h>
+#include <pulsecore/core-subscribe.h>
+#include <pulsecore/log.h>
+#include <pulsecore/play-memblockq.h>
+#include <pulsecore/namereg.h>
+
+#include "sink-input.h"
+
+#define CONVERT_BUFFER_LENGTH (PA_PAGE_SIZE)
+#define SILENCE_BUFFER_LENGTH (PA_PAGE_SIZE*12)
+#define MOVE_BUFFER_LENGTH (PA_PAGE_SIZE*256)
+
+static PA_DEFINE_CHECK_TYPE(pa_sink_input, pa_msgobject);
+
+static void sink_input_free(pa_object *o);
+
+pa_sink_input_new_data* pa_sink_input_new_data_init(pa_sink_input_new_data *data) {
+    pa_assert(data);
+
+    memset(data, 0, sizeof(*data));
+    data->resample_method = PA_RESAMPLER_INVALID;
+
+    return data;
+}
+
+void pa_sink_input_new_data_set_channel_map(pa_sink_input_new_data *data, const pa_channel_map *map) {
+    pa_assert(data);
+
+    if ((data->channel_map_is_set = !!map))
+        data->channel_map = *map;
+}
+
+void pa_sink_input_new_data_set_volume(pa_sink_input_new_data *data, const pa_cvolume *volume) {
+    pa_assert(data);
+
+    if ((data->volume_is_set = !!volume))
+        data->volume = *volume;
+}
+
+void pa_sink_input_new_data_set_sample_spec(pa_sink_input_new_data *data, const pa_sample_spec *spec) {
+    pa_assert(data);
+
+    if ((data->sample_spec_is_set = !!spec))
+        data->sample_spec = *spec;
+}
+
+void pa_sink_input_new_data_set_muted(pa_sink_input_new_data *data, pa_bool_t mute) {
+    pa_assert(data);
+
+    data->muted_is_set = TRUE;
+    data->muted = !!mute;
+}
+
+pa_sink_input* pa_sink_input_new(
+        pa_core *core,
+        pa_sink_input_new_data *data,
+        pa_sink_input_flags_t flags) {
+
+    pa_sink_input *i;
+    pa_resampler *resampler = NULL;
+    char st[PA_SAMPLE_SPEC_SNPRINT_MAX], cm[PA_CHANNEL_MAP_SNPRINT_MAX];
+
+    pa_assert(core);
+    pa_assert(data);
+
+    if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SINK_INPUT_NEW], data) < 0)
+        return NULL;
+
+    pa_return_null_if_fail(!data->driver || pa_utf8_valid(data->driver));
+    pa_return_null_if_fail(!data->name || pa_utf8_valid(data->name));
+
+    if (!data->sink)
+        data->sink = pa_namereg_get(core, NULL, PA_NAMEREG_SINK, 1);
+
+    pa_return_null_if_fail(data->sink);
+    pa_return_null_if_fail(pa_sink_get_state(data->sink) != PA_SINK_UNLINKED);
+    pa_return_null_if_fail(!data->sync_base || (data->sync_base->sink == data->sink && pa_sink_input_get_state(data->sync_base) == PA_SINK_INPUT_CORKED));
+
+    if (!data->sample_spec_is_set)
+        data->sample_spec = data->sink->sample_spec;
+
+    pa_return_null_if_fail(pa_sample_spec_valid(&data->sample_spec));
+
+    if (!data->channel_map_is_set) {
+        if (data->sink->channel_map.channels == data->sample_spec.channels)
+            data->channel_map = data->sink->channel_map;
+        else
+            pa_return_null_if_fail(pa_channel_map_init_auto(&data->channel_map, data->sample_spec.channels, PA_CHANNEL_MAP_DEFAULT));
+    }
+
+    pa_return_null_if_fail(pa_channel_map_valid(&data->channel_map));
+    pa_return_null_if_fail(data->channel_map.channels == data->sample_spec.channels);
+
+    if (!data->volume_is_set)
+        pa_cvolume_reset(&data->volume, data->sample_spec.channels);
+
+    pa_return_null_if_fail(pa_cvolume_valid(&data->volume));
+    pa_return_null_if_fail(data->volume.channels == data->sample_spec.channels);
+
+    if (flags & PA_SINK_INPUT_FIX_FORMAT)
+        data->sample_spec.format = data->sink->sample_spec.format;
+
+    if (flags & PA_SINK_INPUT_FIX_RATE)
+        data->sample_spec.rate = data->sink->sample_spec.rate;
+
+    if (flags & PA_SINK_INPUT_FIX_CHANNELS) {
+        data->sample_spec.channels = data->sink->sample_spec.channels;
+        data->channel_map = data->sink->channel_map;
+    }
+
+    pa_assert(pa_sample_spec_valid(&data->sample_spec));
+    pa_assert(pa_channel_map_valid(&data->channel_map));
+
+    /* Due to the fixing of the sample spec the volume might not match anymore */
+    if (data->volume.channels != data->sample_spec.channels)
+        pa_cvolume_set(&data->volume, data->sample_spec.channels, pa_cvolume_avg(&data->volume));
+
+    if (!data->muted_is_set)
+        data->muted = 0;
+
+    if (data->resample_method == PA_RESAMPLER_INVALID)
+        data->resample_method = core->resample_method;
+
+    pa_return_null_if_fail(data->resample_method < PA_RESAMPLER_MAX);
+
+    if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SINK_INPUT_FIXATE], data) < 0)
+        return NULL;
+
+    if (pa_idxset_size(data->sink->inputs) >= PA_MAX_INPUTS_PER_SINK) {
+        pa_log_warn("Failed to create sink input: too many inputs per sink.");
+        return NULL;
+    }
+
+    if ((flags & PA_SINK_INPUT_VARIABLE_RATE) ||
+        !pa_sample_spec_equal(&data->sample_spec, &data->sink->sample_spec) ||
+        !pa_channel_map_equal(&data->channel_map, &data->sink->channel_map)) {
+
+        if (!(resampler = pa_resampler_new(
+                      core->mempool,
+                      &data->sample_spec, &data->channel_map,
+                      &data->sink->sample_spec, &data->sink->channel_map,
+                      data->resample_method,
+                      ((flags & PA_SINK_INPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
+                      ((flags & PA_SINK_INPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
+                      (core->disable_remixing || (flags & PA_SINK_INPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
+            pa_log_warn("Unsupported resampling operation.");
+            return NULL;
+        }
+
+        data->resample_method = pa_resampler_get_method(resampler);
+    }
+
+    i = pa_msgobject_new(pa_sink_input);
+    i->parent.parent.free = sink_input_free;
+    i->parent.process_msg = pa_sink_input_process_msg;
+
+    i->core = core;
+    i->state = PA_SINK_INPUT_INIT;
+    i->flags = flags;
+    i->name = pa_xstrdup(data->name);
+    i->driver = pa_xstrdup(data->driver);
+    i->module = data->module;
+    i->sink = data->sink;
+    i->client = data->client;
+
+    i->resample_method = data->resample_method;
+    i->sample_spec = data->sample_spec;
+    i->channel_map = data->channel_map;
+
+    i->volume = data->volume;
+    i->muted = data->muted;
+
+    if (data->sync_base) {
+        i->sync_next = data->sync_base->sync_next;
+        i->sync_prev = data->sync_base;
+
+        if (data->sync_base->sync_next)
+            data->sync_base->sync_next->sync_prev = i;
+        data->sync_base->sync_next = i;
+    } else
+        i->sync_next = i->sync_prev = NULL;
+
+    i->peek = NULL;
+    i->drop = NULL;
+    i->kill = NULL;
+    i->get_latency = NULL;
+    i->attach = NULL;
+    i->detach = NULL;
+    i->suspend = NULL;
+    i->moved = NULL;
+    i->userdata = NULL;
+
+    i->thread_info.state = i->state;
+    pa_atomic_store(&i->thread_info.drained, 1);
+    i->thread_info.sample_spec = i->sample_spec;
+    i->thread_info.silence_memblock = NULL;
+    i->thread_info.move_silence = 0;
+    pa_memchunk_reset(&i->thread_info.resampled_chunk);
+    i->thread_info.resampler = resampler;
+    i->thread_info.volume = i->volume;
+    i->thread_info.muted = i->muted;
+    i->thread_info.attached = FALSE;
+
+    pa_assert_se(pa_idxset_put(core->sink_inputs, pa_sink_input_ref(i), &i->index) == 0);
+    pa_assert_se(pa_idxset_put(i->sink->inputs, i, NULL) == 0);
+
+    pa_log_info("Created input %u \"%s\" on %s with sample spec %s and channel map %s",
+                i->index,
+                i->name,
+                i->sink->name,
+                pa_sample_spec_snprint(st, sizeof(st), &i->sample_spec),
+                pa_channel_map_snprint(cm, sizeof(cm), &i->channel_map));
+
+    /* Don't forget to call pa_sink_input_put! */
+
+    return i;
+}
+
+static void update_n_corked(pa_sink_input *i, pa_sink_input_state_t state) {
+    pa_assert(i);
+
+    if (i->state == PA_SINK_INPUT_CORKED && state != PA_SINK_INPUT_CORKED)
+        pa_assert_se(i->sink->n_corked -- >= 1);
+    else if (i->state != PA_SINK_INPUT_CORKED && state == PA_SINK_INPUT_CORKED)
+        i->sink->n_corked++;
+
+    pa_sink_update_status(i->sink);
+}
+
+static int sink_input_set_state(pa_sink_input *i, pa_sink_input_state_t state) {
+    pa_sink_input *ssync;
+    pa_assert(i);
+
+    if (state == PA_SINK_INPUT_DRAINED)
+        state = PA_SINK_INPUT_RUNNING;
+
+    if (i->state == state)
+        return 0;
+
+    if (pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_STATE, PA_UINT_TO_PTR(state), 0, NULL) < 0)
+        return -1;
+
+    update_n_corked(i, state);
+    i->state = state;
+
+    for (ssync = i->sync_prev; ssync; ssync = ssync->sync_prev) {
+        update_n_corked(ssync, state);
+        ssync->state = state;
+    }
+    for (ssync = i->sync_next; ssync; ssync = ssync->sync_next) {
+        update_n_corked(ssync, state);
+        ssync->state = state;
+    }
+
+    if (state != PA_SINK_INPUT_UNLINKED)
+        pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_STATE_CHANGED], i);
+
+    return 0;
+}
+
+void pa_sink_input_unlink(pa_sink_input *i) {
+    pa_bool_t linked;
+    pa_assert(i);
+
+    /* See pa_sink_unlink() for a couple of comments how this function
+     * works */
+
+    pa_sink_input_ref(i);
+
+    linked = PA_SINK_INPUT_LINKED(i->state);
+
+    if (linked)
+        pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_UNLINK], i);
+
+    if (i->sync_prev)
+        i->sync_prev->sync_next = i->sync_next;
+    if (i->sync_next)
+        i->sync_next->sync_prev = i->sync_prev;
+
+    i->sync_prev = i->sync_next = NULL;
+
+    pa_idxset_remove_by_data(i->sink->core->sink_inputs, i, NULL);
+    if (pa_idxset_remove_by_data(i->sink->inputs, i, NULL))
+        pa_sink_input_unref(i);
+
+    if (linked) {
+        pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_REMOVE_INPUT, i, 0, NULL);
+        sink_input_set_state(i, PA_SINK_INPUT_UNLINKED);
+        pa_sink_update_status(i->sink);
+    } else
+        i->state = PA_SINK_INPUT_UNLINKED;
+
+    i->peek = NULL;
+    i->drop = NULL;
+    i->kill = NULL;
+    i->get_latency = NULL;
+    i->attach = NULL;
+    i->detach = NULL;
+    i->suspend = NULL;
+    i->moved = NULL;
+
+    if (linked) {
+        pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_REMOVE, i->index);
+        pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_UNLINK_POST], i);
+    }
+
+    i->sink = NULL;
+    pa_sink_input_unref(i);
+}
+
+static void sink_input_free(pa_object *o) {
+    pa_sink_input* i = PA_SINK_INPUT(o);
+
+    pa_assert(i);
+    pa_assert(pa_sink_input_refcnt(i) == 0);
+
+    if (PA_SINK_INPUT_LINKED(i->state))
+        pa_sink_input_unlink(i);
+
+    pa_log_info("Freeing output %u \"%s\"", i->index, i->name);
+
+    pa_assert(!i->thread_info.attached);
+
+    if (i->thread_info.resampled_chunk.memblock)
+        pa_memblock_unref(i->thread_info.resampled_chunk.memblock);
+
+    if (i->thread_info.resampler)
+        pa_resampler_free(i->thread_info.resampler);
+
+    if (i->thread_info.silence_memblock)
+        pa_memblock_unref(i->thread_info.silence_memblock);
+
+    pa_xfree(i->name);
+    pa_xfree(i->driver);
+    pa_xfree(i);
+}
+
+void pa_sink_input_put(pa_sink_input *i) {
+    pa_sink_input_assert_ref(i);
+
+    pa_assert(i->state == PA_SINK_INPUT_INIT);
+    pa_assert(i->peek);
+    pa_assert(i->drop);
+
+    i->thread_info.state = i->state = i->flags & PA_SINK_INPUT_START_CORKED ? PA_SINK_INPUT_CORKED : PA_SINK_INPUT_RUNNING;
+    i->thread_info.volume = i->volume;
+    i->thread_info.muted = i->muted;
+
+    if (i->state == PA_SINK_INPUT_CORKED)
+        i->sink->n_corked++;
+
+    pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_ADD_INPUT, i, 0, NULL);
+    pa_sink_update_status(i->sink);
+
+    pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW, i->index);
+    pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_PUT], i);
+
+    /* Please note that if you change something here, you have to
+       change something in pa_sink_input_move() with the ghost stream
+       registration too. */
+}
+
+void pa_sink_input_kill(pa_sink_input*i) {
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->state));
+
+    if (i->kill)
+        i->kill(i);
+}
+
+pa_usec_t pa_sink_input_get_latency(pa_sink_input *i) {
+    pa_usec_t r = 0;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->state));
+
+    if (pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_GET_LATENCY, &r, 0, NULL) < 0)
+        r = 0;
+
+    if (i->get_latency)
+        r += i->get_latency(i);
+
+    return r;
+}
+
+/* Called from thread context */
+int pa_sink_input_peek(pa_sink_input *i, size_t length, pa_memchunk *chunk, pa_cvolume *volume) {
+    int ret = -1;
+    int do_volume_adj_here;
+    int volume_is_norm;
+    size_t block_size_max;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->thread_info.state));
+    pa_assert(pa_frame_aligned(length, &i->sink->sample_spec));
+    pa_assert(chunk);
+    pa_assert(volume);
+
+    if (!i->peek || !i->drop || i->thread_info.state == PA_SINK_INPUT_CORKED)
+        goto finish;
+
+    pa_assert(i->thread_info.state == PA_SINK_INPUT_RUNNING || i->thread_info.state == PA_SINK_INPUT_DRAINED);
+
+    /* Default buffer size */
+    if (length <= 0)
+        length = pa_frame_align(CONVERT_BUFFER_LENGTH, &i->sink->sample_spec);
+
+    /* Make sure the buffer fits in the mempool tile */
+    block_size_max = pa_mempool_block_size_max(i->sink->core->mempool);
+    if (length > block_size_max)
+        length = pa_frame_align(block_size_max, &i->sink->sample_spec);
+
+    if (i->thread_info.move_silence > 0) {
+        size_t l;
+
+        /* We have just been moved and shall play some silence for a
+         * while until the old sink has drained its playback buffer */
+
+        if (!i->thread_info.silence_memblock)
+            i->thread_info.silence_memblock = pa_silence_memblock_new(
+                    i->sink->core->mempool,
+                    &i->sink->sample_spec,
+                    pa_frame_align(SILENCE_BUFFER_LENGTH, &i->sink->sample_spec));
+
+        chunk->memblock = pa_memblock_ref(i->thread_info.silence_memblock);
+        chunk->index = 0;
+        l = pa_memblock_get_length(chunk->memblock);
+        chunk->length = i->thread_info.move_silence < l ? i->thread_info.move_silence : l;
+
+        ret = 0;
+        do_volume_adj_here = 1;
+        goto finish;
+    }
+
+    if (!i->thread_info.resampler) {
+        do_volume_adj_here = 0; /* FIXME??? */
+        ret = i->peek(i, length, chunk);
+        goto finish;
+    }
+
+    do_volume_adj_here = !pa_channel_map_equal(&i->channel_map, &i->sink->channel_map);
+    volume_is_norm = pa_cvolume_is_norm(&i->thread_info.volume) && !i->thread_info.muted;
+
+    while (!i->thread_info.resampled_chunk.memblock) {
+        pa_memchunk tchunk;
+        size_t l, rmbs;
+
+        l = pa_resampler_request(i->thread_info.resampler, length);
+
+        if (l <= 0)
+            l = pa_frame_align(CONVERT_BUFFER_LENGTH, &i->sample_spec);
+
+        rmbs = pa_resampler_max_block_size(i->thread_info.resampler);
+        if (l > rmbs)
+            l = rmbs;
+
+        if ((ret = i->peek(i, l, &tchunk)) < 0)
+            goto finish;
+
+        pa_assert(tchunk.length > 0);
+
+        if (tchunk.length > l)
+            tchunk.length = l;
+
+        i->drop(i, tchunk.length);
+
+        /* It might be necessary to adjust the volume here */
+        if (do_volume_adj_here && !volume_is_norm) {
+            pa_memchunk_make_writable(&tchunk, 0);
+
+            if (i->thread_info.muted)
+                pa_silence_memchunk(&tchunk, &i->thread_info.sample_spec);
+            else
+                pa_volume_memchunk(&tchunk, &i->thread_info.sample_spec, &i->thread_info.volume);
+        }
+
+        pa_resampler_run(i->thread_info.resampler, &tchunk, &i->thread_info.resampled_chunk);
+        pa_memblock_unref(tchunk.memblock);
+    }
+
+    pa_assert(i->thread_info.resampled_chunk.memblock);
+    pa_assert(i->thread_info.resampled_chunk.length > 0);
+
+    *chunk = i->thread_info.resampled_chunk;
+    pa_memblock_ref(i->thread_info.resampled_chunk.memblock);
+
+    ret = 0;
+
+finish:
+
+    if (ret >= 0)
+        pa_atomic_store(&i->thread_info.drained, 0);
+    else if (ret < 0)
+        pa_atomic_store(&i->thread_info.drained, 1);
+
+    if (ret >= 0) {
+        /* Let's see if we had to apply the volume adjustment
+         * ourselves, or if this can be done by the sink for us */
+
+        if (do_volume_adj_here)
+            /* We had different channel maps, so we already did the adjustment */
+            pa_cvolume_reset(volume, i->sink->sample_spec.channels);
+        else if (i->thread_info.muted)
+            /* We've both the same channel map, so let's have the sink do the adjustment for us*/
+            pa_cvolume_mute(volume, i->sink->sample_spec.channels);
+        else
+            *volume = i->thread_info.volume;
+    }
+
+    return ret;
+}
+
+/* Called from thread context */
+void pa_sink_input_drop(pa_sink_input *i, size_t length) {
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->thread_info.state));
+    pa_assert(pa_frame_aligned(length, &i->sink->sample_spec));
+    pa_assert(length > 0);
+
+    if (!i->peek || !i->drop || i->thread_info.state == PA_SINK_INPUT_CORKED)
+        return;
+
+    if (i->thread_info.move_silence > 0) {
+
+        if (i->thread_info.move_silence >= length) {
+            i->thread_info.move_silence -= length;
+            length = 0;
+        } else {
+            length -= i->thread_info.move_silence;
+            i->thread_info.move_silence = 0;
+        }
+
+        if (i->thread_info.move_silence <= 0) {
+            if (i->thread_info.silence_memblock) {
+                pa_memblock_unref(i->thread_info.silence_memblock);
+                i->thread_info.silence_memblock = NULL;
+            }
+        }
+
+        if (length <= 0)
+            return;
+    }
+
+    if (i->thread_info.resampled_chunk.memblock) {
+        size_t l = length;
+
+        if (l > i->thread_info.resampled_chunk.length)
+            l = i->thread_info.resampled_chunk.length;
+
+        i->thread_info.resampled_chunk.index += l;
+        i->thread_info.resampled_chunk.length -= l;
+
+        if (i->thread_info.resampled_chunk.length <= 0) {
+            pa_memblock_unref(i->thread_info.resampled_chunk.memblock);
+            pa_memchunk_reset(&i->thread_info.resampled_chunk);
+        }
+
+        length -= l;
+    }
+
+    if (length > 0) {
+
+        if (i->thread_info.resampler) {
+            /* So, we have a resampler. To avoid discontinuities we
+             * have to actually read all data that could be read and
+             * pass it through the resampler. */
+
+            while (length > 0) {
+                pa_memchunk chunk;
+                pa_cvolume volume;
+
+                if (pa_sink_input_peek(i, length, &chunk, &volume) >= 0) {
+                    size_t l;
+
+                    pa_memblock_unref(chunk.memblock);
+
+                    l = chunk.length;
+                    if (l > length)
+                        l = length;
+
+                    pa_sink_input_drop(i, l);
+                    length -= l;
+
+                } else {
+                    size_t l;
+
+                    l = pa_resampler_request(i->thread_info.resampler, length);
+
+                    /* Hmmm, peeking failed, so let's at least drop
+                     * the right amount of data */
+
+                    if (l > 0)
+                        if (i->drop)
+                            i->drop(i, l);
+
+                    break;
+                }
+            }
+
+        } else {
+
+            /* We have no resampler, hence let's just drop the data */
+
+            if (i->drop)
+                i->drop(i, length);
+        }
+    }
+}
+
+void pa_sink_input_set_volume(pa_sink_input *i, const pa_cvolume *volume) {
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->state));
+
+    if (pa_cvolume_equal(&i->volume, volume))
+        return;
+
+    i->volume = *volume;
+
+    pa_asyncmsgq_post(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_VOLUME, pa_xnewdup(struct pa_cvolume, volume, 1), 0, NULL, pa_xfree);
+    pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
+}
+
+const pa_cvolume *pa_sink_input_get_volume(pa_sink_input *i) {
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->state));
+
+    return &i->volume;
+}
+
+void pa_sink_input_set_mute(pa_sink_input *i, pa_bool_t mute) {
+    pa_assert(i);
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->state));
+
+    if (!i->muted == !mute)
+        return;
+
+    i->muted = mute;
+
+    pa_asyncmsgq_post(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_MUTE, PA_UINT_TO_PTR(mute), 0, NULL, NULL);
+    pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
+}
+
+int pa_sink_input_get_mute(pa_sink_input *i) {
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->state));
+
+    return !!i->muted;
+}
+
+void pa_sink_input_cork(pa_sink_input *i, pa_bool_t b) {
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->state));
+
+    sink_input_set_state(i, b ? PA_SINK_INPUT_CORKED : PA_SINK_INPUT_RUNNING);
+}
+
+int pa_sink_input_set_rate(pa_sink_input *i, uint32_t rate) {
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->state));
+    pa_return_val_if_fail(i->thread_info.resampler, -1);
+
+    if (i->sample_spec.rate == rate)
+        return 0;
+
+    i->sample_spec.rate = rate;
+
+    pa_asyncmsgq_post(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_RATE, PA_UINT_TO_PTR(rate), 0, NULL, NULL);
+
+    pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
+    return 0;
+}
+
+void pa_sink_input_set_name(pa_sink_input *i, const char *name) {
+    pa_sink_input_assert_ref(i);
+
+    if (!i->name && !name)
+        return;
+
+    if (i->name && name && !strcmp(i->name, name))
+        return;
+
+    pa_xfree(i->name);
+    i->name = pa_xstrdup(name);
+
+    if (PA_SINK_INPUT_LINKED(i->state)) {
+        pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_NAME_CHANGED], i);
+        pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
+    }
+}
+
+pa_resample_method_t pa_sink_input_get_resample_method(pa_sink_input *i) {
+    pa_sink_input_assert_ref(i);
+
+    return i->resample_method;
+}
+
+int pa_sink_input_move_to(pa_sink_input *i, pa_sink *dest, int immediately) {
+    pa_resampler *new_resampler;
+    pa_sink *origin;
+    pa_usec_t silence_usec = 0;
+    pa_sink_input_move_info info;
+    pa_sink_input_move_hook_data hook_data;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->state));
+    pa_sink_assert_ref(dest);
+
+    origin = i->sink;
+
+    if (dest == origin)
+        return 0;
+
+    if (i->flags & PA_SINK_INPUT_DONT_MOVE)
+        return -1;
+
+    if (i->sync_next || i->sync_prev) {
+        pa_log_warn("Moving synchronised streams not supported.");
+        return -1;
+    }
+
+    if (pa_idxset_size(dest->inputs) >= PA_MAX_INPUTS_PER_SINK) {
+        pa_log_warn("Failed to move sink input: too many inputs per sink.");
+        return -1;
+    }
+
+    if (i->thread_info.resampler &&
+        pa_sample_spec_equal(&origin->sample_spec, &dest->sample_spec) &&
+        pa_channel_map_equal(&origin->channel_map, &dest->channel_map))
+
+        /* Try to reuse the old resampler if possible */
+        new_resampler = i->thread_info.resampler;
+
+    else if ((i->flags & PA_SINK_INPUT_VARIABLE_RATE) ||
+             !pa_sample_spec_equal(&i->sample_spec, &dest->sample_spec) ||
+             !pa_channel_map_equal(&i->channel_map, &dest->channel_map)) {
+
+        /* Okey, we need a new resampler for the new sink */
+
+        if (!(new_resampler = pa_resampler_new(
+                      dest->core->mempool,
+                      &i->sample_spec, &i->channel_map,
+                      &dest->sample_spec, &dest->channel_map,
+                      i->resample_method,
+                      ((i->flags & PA_SINK_INPUT_VARIABLE_RATE) ? PA_RESAMPLER_VARIABLE_RATE : 0) |
+                      ((i->flags & PA_SINK_INPUT_NO_REMAP) ? PA_RESAMPLER_NO_REMAP : 0) |
+                      (i->core->disable_remixing || (i->flags & PA_SINK_INPUT_NO_REMIX) ? PA_RESAMPLER_NO_REMIX : 0)))) {
+            pa_log_warn("Unsupported resampling operation.");
+            return -1;
+        }
+    } else
+        new_resampler = NULL;
+
+    hook_data.sink_input = i;
+    hook_data.destination = dest;
+    pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_MOVE], &hook_data);
+
+    memset(&info, 0, sizeof(info));
+    info.sink_input = i;
+
+    if (!immediately) {
+        pa_usec_t old_latency, new_latency;
+
+        /* Let's do a little bit of Voodoo for compensating latency
+         * differences. We assume that the accuracy for our
+         * estimations is still good enough, even though we do these
+         * operations non-atomic. */
+
+        old_latency = pa_sink_get_latency(origin);
+        new_latency = pa_sink_get_latency(dest);
+
+        /* The already resampled data should go to the old sink */
+
+        if (old_latency >= new_latency) {
+
+            /* The latency of the old sink is larger than the latency
+             * of the new sink. Therefore to compensate for the
+             * difference we to play silence on the new one for a
+             * while */
+
+            silence_usec = old_latency - new_latency;
+
+        } else {
+
+            /* The latency of new sink is larger than the latency of
+             * the old sink. Therefore we have to precompute a little
+             * and make sure that this is still played on the old
+             * sink, until we can play the first sample on the new
+             * sink.*/
+
+            info.buffer_bytes = pa_usec_to_bytes(new_latency - old_latency, &origin->sample_spec);
+        }
+
+        /* Okey, let's move it */
+
+        if (info.buffer_bytes > 0) {
+
+            info.ghost_sink_input = pa_memblockq_sink_input_new(
+                    origin,
+                    "Ghost Stream",
+                    &origin->sample_spec,
+                    &origin->channel_map,
+                    NULL,
+                    NULL);
+
+            info.ghost_sink_input->thread_info.state = info.ghost_sink_input->state = PA_SINK_INPUT_RUNNING;
+            info.ghost_sink_input->thread_info.volume = info.ghost_sink_input->volume;
+            info.ghost_sink_input->thread_info.muted = info.ghost_sink_input->muted;
+
+            info.buffer = pa_memblockq_new(0, MOVE_BUFFER_LENGTH, 0, pa_frame_size(&origin->sample_spec), 0, 0, NULL);
+        }
+    }
+
+    pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_REMOVE_INPUT_AND_BUFFER, &info, 0, NULL);
+
+    if (info.ghost_sink_input) {
+        /* Basically, do what pa_sink_input_put() does ...*/
+
+        pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW, info.ghost_sink_input->index);
+        pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_PUT], info.ghost_sink_input);
+        pa_sink_input_unref(info.ghost_sink_input);
+    }
+
+    pa_idxset_remove_by_data(origin->inputs, i, NULL);
+    pa_idxset_put(dest->inputs, i, NULL);
+    i->sink = dest;
+
+    if (pa_sink_input_get_state(i) == PA_SINK_INPUT_CORKED) {
+        pa_assert_se(origin->n_corked-- >= 1);
+        dest->n_corked++;
+    }
+
+    /* Replace resampler */
+    if (new_resampler != i->thread_info.resampler) {
+        if (i->thread_info.resampler)
+            pa_resampler_free(i->thread_info.resampler);
+        i->thread_info.resampler = new_resampler;
+
+        /* if the resampler changed, the silence memblock is
+         * probably invalid now, too */
+        if (i->thread_info.silence_memblock) {
+            pa_memblock_unref(i->thread_info.silence_memblock);
+            i->thread_info.silence_memblock = NULL;
+        }
+    }
+
+    /* Dump already resampled data */
+    if (i->thread_info.resampled_chunk.memblock) {
+        /* Hmm, this data has already been added to the ghost queue, presumably, hence let's sleep a little bit longer */
+        silence_usec += pa_bytes_to_usec(i->thread_info.resampled_chunk.length, &origin->sample_spec);
+        pa_memblock_unref(i->thread_info.resampled_chunk.memblock);
+        pa_memchunk_reset(&i->thread_info.resampled_chunk);
+    }
+
+    /* Calculate the new sleeping time */
+    if (immediately)
+        i->thread_info.move_silence = 0;
+    else
+        i->thread_info.move_silence = pa_usec_to_bytes(
+                pa_bytes_to_usec(i->thread_info.move_silence, &origin->sample_spec) +
+                silence_usec,
+                &dest->sample_spec);
+
+    pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i->sink), PA_SINK_MESSAGE_ADD_INPUT, i, 0, NULL);
+
+    pa_sink_update_status(origin);
+    pa_sink_update_status(dest);
+
+    if (i->moved)
+        i->moved(i);
+
+    pa_hook_fire(&i->sink->core->hooks[PA_CORE_HOOK_SINK_INPUT_MOVE_POST], i);
+
+    pa_log_debug("Successfully moved sink input %i from %s to %s.", i->index, origin->name, dest->name);
+
+    /* Notify everyone */
+    pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE, i->index);
+
+    return 0;
+}
+
+/* Called from thread context */
+int pa_sink_input_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk) {
+    pa_sink_input *i = PA_SINK_INPUT(o);
+
+    pa_sink_input_assert_ref(i);
+    pa_assert(PA_SINK_INPUT_LINKED(i->thread_info.state));
+
+    switch (code) {
+        case PA_SINK_INPUT_MESSAGE_SET_VOLUME:
+            i->thread_info.volume = *((pa_cvolume*) userdata);
+            return 0;
+
+        case PA_SINK_INPUT_MESSAGE_SET_MUTE:
+            i->thread_info.muted = PA_PTR_TO_UINT(userdata);
+            return 0;
+
+        case PA_SINK_INPUT_MESSAGE_GET_LATENCY: {
+            pa_usec_t *r = userdata;
+
+            if (i->thread_info.resampled_chunk.memblock)
+                *r += pa_bytes_to_usec(i->thread_info.resampled_chunk.length, &i->sink->sample_spec);
+
+            if (i->thread_info.move_silence)
+                *r += pa_bytes_to_usec(i->thread_info.move_silence, &i->sink->sample_spec);
+
+            return 0;
+        }
+
+        case PA_SINK_INPUT_MESSAGE_SET_RATE:
+
+            i->thread_info.sample_spec.rate = PA_PTR_TO_UINT(userdata);
+            pa_resampler_set_input_rate(i->thread_info.resampler, PA_PTR_TO_UINT(userdata));
+
+            return 0;
+
+        case PA_SINK_INPUT_MESSAGE_SET_STATE: {
+            pa_sink_input *ssync;
+
+            if ((PA_PTR_TO_UINT(userdata) == PA_SINK_INPUT_DRAINED || PA_PTR_TO_UINT(userdata) == PA_SINK_INPUT_RUNNING) &&
+                (i->thread_info.state != PA_SINK_INPUT_DRAINED) && (i->thread_info.state != PA_SINK_INPUT_RUNNING))
+                pa_atomic_store(&i->thread_info.drained, 1);
+
+            i->thread_info.state = PA_PTR_TO_UINT(userdata);
+
+            for (ssync = i->thread_info.sync_prev; ssync; ssync = ssync->thread_info.sync_prev) {
+                if ((PA_PTR_TO_UINT(userdata) == PA_SINK_INPUT_DRAINED || PA_PTR_TO_UINT(userdata) == PA_SINK_INPUT_RUNNING) &&
+                    (ssync->thread_info.state != PA_SINK_INPUT_DRAINED) && (ssync->thread_info.state != PA_SINK_INPUT_RUNNING))
+                    pa_atomic_store(&ssync->thread_info.drained, 1);
+                ssync->thread_info.state = PA_PTR_TO_UINT(userdata);
+            }
+
+            for (ssync = i->thread_info.sync_next; ssync; ssync = ssync->thread_info.sync_next) {
+                if ((PA_PTR_TO_UINT(userdata) == PA_SINK_INPUT_DRAINED || PA_PTR_TO_UINT(userdata) == PA_SINK_INPUT_RUNNING) &&
+                    (ssync->thread_info.state != PA_SINK_INPUT_DRAINED) && (ssync->thread_info.state != PA_SINK_INPUT_RUNNING))
+                    pa_atomic_store(&ssync->thread_info.drained, 1);
+                ssync->thread_info.state = PA_PTR_TO_UINT(userdata);
+            }
+
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+pa_sink_input_state_t pa_sink_input_get_state(pa_sink_input *i) {
+    pa_sink_input_assert_ref(i);
+
+    if (i->state == PA_SINK_INPUT_RUNNING || i->state == PA_SINK_INPUT_DRAINED)
+        return pa_atomic_load(&i->thread_info.drained) ? PA_SINK_INPUT_DRAINED : PA_SINK_INPUT_RUNNING;
+
+    return i->state;
+}