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-rw-r--r--src/modules/alsa-util.c387
1 files changed, 363 insertions, 24 deletions
diff --git a/src/modules/alsa-util.c b/src/modules/alsa-util.c
index 6afec3bc..d212abc2 100644
--- a/src/modules/alsa-util.c
+++ b/src/modules/alsa-util.c
@@ -27,6 +27,7 @@
#endif
#include <sys/types.h>
+#include <limits.h>
#include <asoundlib.h>
#include <pulse/sample.h>
@@ -35,6 +36,7 @@
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include <pulsecore/core-util.h>
+#include <pulsecore/atomic.h>
#include "alsa-util.h"
@@ -290,16 +292,22 @@ int pa_alsa_set_hw_params(
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);
@@ -308,8 +316,6 @@ int pa_alsa_set_hw_params(
snd_pcm_hw_params_alloca(&hwparams);
- buffer_size = *periods * *period_size;
-
if ((ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0)
goto finish;
@@ -330,12 +336,19 @@ int pa_alsa_set_hw_params(
} 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;
@@ -344,10 +357,32 @@ int pa_alsa_set_hw_params(
goto finish;
}
- if ((*period_size > 0 && (ret = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, period_size, NULL)) < 0) ||
- (*periods > 0 && (ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0))
+ 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) {
+ 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;
@@ -363,8 +398,8 @@ int pa_alsa_set_hw_params(
if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
goto finish;
- if ((ret = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size)) < 0 ||
- (ret = snd_pcm_hw_params_get_period_size(hwparams, period_size, NULL)) < 0)
+ 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 */
@@ -373,14 +408,18 @@ int pa_alsa_set_hw_params(
ss->channels = c;
ss->format = f;
- pa_assert(buffer_size > 0);
- pa_assert(*period_size > 0);
- *periods = buffer_size / *period_size;
- pa_assert(*periods > 0);
+ 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;
finish:
@@ -388,7 +427,7 @@ finish:
return ret;
}
-int pa_alsa_set_sw_params(snd_pcm_t *pcm) {
+int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min) {
snd_pcm_sw_params_t *swparams;
int err;
@@ -411,6 +450,11 @@ int pa_alsa_set_sw_params(snd_pcm_t *pcm) {
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;
@@ -477,7 +521,9 @@ snd_pcm_t *pa_alsa_open_by_device_id(
int mode,
uint32_t *nfrags,
snd_pcm_uframes_t *period_size,
- pa_bool_t *use_mmap) {
+ snd_pcm_uframes_t tsched_size,
+ pa_bool_t *use_mmap,
+ pa_bool_t *use_tsched) {
int i;
int direction = 1;
@@ -526,7 +572,11 @@ snd_pcm_t *pa_alsa_open_by_device_id(
d = pa_sprintf_malloc("%s:%s", device_table[i].name, dev_id);
pa_log_debug("Trying %s...", d);
- if ((err = snd_pcm_open(&pcm_handle, d, mode, SND_PCM_NONBLOCK)) < 0) {
+ if ((err = snd_pcm_open(&pcm_handle, d, mode,
+ SND_PCM_NONBLOCK|
+ SND_PCM_NO_AUTO_RESAMPLE|
+ SND_PCM_NO_AUTO_CHANNELS|
+ SND_PCM_NO_AUTO_FORMAT)) < 0) {
pa_log_info("Couldn't open PCM device %s: %s", d, snd_strerror(err));
pa_xfree(d);
continue;
@@ -536,7 +586,7 @@ snd_pcm_t *pa_alsa_open_by_device_id(
try_ss.rate = ss->rate;
try_ss.format = ss->format;
- if ((err = pa_alsa_set_hw_params(pcm_handle, &try_ss, nfrags, period_size, use_mmap, TRUE)) < 0) {
+ if ((err = pa_alsa_set_hw_params(pcm_handle, &try_ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, TRUE)) < 0) {
pa_log_info("PCM device %s refused our hw parameters: %s", d, snd_strerror(err));
pa_xfree(d);
snd_pcm_close(pcm_handle);
@@ -550,11 +600,11 @@ snd_pcm_t *pa_alsa_open_by_device_id(
return pcm_handle;
}
- /* OK, we didn't find any good device, so let's try the raw hw: stuff */
+ /* OK, we didn't find any good device, so let's try the raw plughw: stuff */
- d = pa_sprintf_malloc("hw:%s", dev_id);
+ d = pa_sprintf_malloc("plughw:%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, use_mmap);
+ 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;
@@ -568,7 +618,9 @@ snd_pcm_t *pa_alsa_open_by_device_string(
int mode,
uint32_t *nfrags,
snd_pcm_uframes_t *period_size,
- pa_bool_t *use_mmap) {
+ snd_pcm_uframes_t tsched_size,
+ pa_bool_t *use_mmap,
+ pa_bool_t *use_tsched) {
int err;
char *d;
@@ -585,13 +637,16 @@ snd_pcm_t *pa_alsa_open_by_device_string(
for (;;) {
- if ((err = snd_pcm_open(&pcm_handle, d, mode, SND_PCM_NONBLOCK)) < 0) {
+ if ((err = snd_pcm_open(&pcm_handle, d, mode, 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", d, snd_strerror(err));
pa_xfree(d);
return NULL;
}
- if ((err = pa_alsa_set_hw_params(pcm_handle, ss, nfrags, period_size, use_mmap, FALSE)) < 0) {
+ if ((err = pa_alsa_set_hw_params(pcm_handle, ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, FALSE)) < 0) {
if (err == -EPERM) {
/* Hmm, some hw is very exotic, so we retry with plug, if without it didn't work */
@@ -616,8 +671,24 @@ snd_pcm_t *pa_alsa_open_by_device_string(
*dev = d;
if (ss->channels != map->channels) {
- pa_assert_se(pa_channel_map_init_auto(map, ss->channels, PA_CHANNEL_MAP_AUX));
- pa_channel_map_init_auto(map, ss->channels, PA_CHANNEL_MAP_ALSA);
+ if (!pa_channel_map_init_auto(map, ss->channels, PA_CHANNEL_MAP_ALSA)) {
+ unsigned c;
+ pa_channel_position_t pos;
+
+ pa_log_warn("Device has an unknown channel mapping. This is a limitation of ALSA. Synthesizing channel map.");
+
+ for (c = ss->channels; c > 0; c--)
+ if (pa_channel_map_init_auto(map, c, PA_CHANNEL_MAP_ALSA))
+ break;
+
+ pa_assert(c > 0);
+
+ pos = PA_CHANNEL_POSITION_AUX0;
+ for (; c < map->channels; c ++)
+ map->map[c] = pos++;
+
+ map->channels = ss->channels;
+ }
}
return pcm_handle;
@@ -773,7 +844,7 @@ int pa_alsa_calc_mixer_map(snd_mixer_elem_t *elem, const pa_channel_map *channel
}
if ((is_mono && mono_used) || (!is_mono && alsa_channel_used[id])) {
- pa_log_info("Channel map has duplicate channel '%s', failling back to software volume control.", pa_channel_position_to_string(channel_map->map[i]));
+ 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;
}
@@ -793,7 +864,275 @@ int pa_alsa_calc_mixer_map(snd_mixer_elem_t *elem, const pa_channel_map *channel
}
}
- pa_log_info("All %u channels can be mapped to mixer channels. Using hardware volume control.", channel_map->channels);
+ pa_log_info("All %u channels can be mapped to mixer channels.", channel_map->channels);
return 0;
}
+
+void pa_alsa_0dB_playback(snd_mixer_elem_t *elem) {
+ long min, max, v;
+
+ pa_assert(elem);
+
+ /* Try to enable 0 dB if possible. If ALSA cannot do dB, then use
+ * raw volume levels and fix them to 75% */
+
+ if (snd_mixer_selem_set_playback_dB_all(elem, 0, -1) >= 0)
+ return;
+
+ if (snd_mixer_selem_set_playback_dB_all(elem, 0, 1) >= 0)
+ return;
+
+ if (snd_mixer_selem_get_playback_volume_range(elem, &min, &max) < 0)
+ return;
+
+ v = min + ((max - min) * 3) / 4; /* 75% */
+
+ if (v <= min)
+ v = max;
+
+ snd_mixer_selem_set_playback_volume_all(elem, v);
+}
+
+void pa_alsa_0dB_capture(snd_mixer_elem_t *elem) {
+ long min, max, v;
+
+ pa_assert(elem);
+
+ /* Try to enable 0 dB if possible. If ALSA cannot do dB, then use
+ * raw volume levels and fix them to 75% */
+
+ if (snd_mixer_selem_set_capture_dB_all(elem, 0, -1) >= 0)
+ return;
+
+ if (snd_mixer_selem_set_capture_dB_all(elem, 0, 1) >= 0)
+ return;
+
+ if (snd_mixer_selem_get_capture_volume_range(elem, &min, &max) < 0)
+ return;
+
+ v = min + ((max - min) * 3) / 4; /* 75% */
+
+ if (v <= min)
+ v = max;
+
+ snd_mixer_selem_set_capture_volume_all(elem, v);
+}
+
+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;
+
+ va_start(ap, fmt);
+
+ pa_log_levelv_meta(PA_LOG_WARN, file, line, function, fmt, ap);
+
+ va_end(ap);
+}
+
+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_warn("Got POLLERR from ALSA");
+ if (revents & POLLNVAL)
+ pa_log_warn("Got POLLNVAL from ALSA");
+ if (revents & POLLHUP)
+ pa_log_warn("Got POLLHUP from ALSA");
+
+ state = snd_pcm_state(pcm);
+ pa_log_warn("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, n);
+ pollfd = pa_rtpoll_item_get_pollfd(item, NULL);
+
+ if ((err = snd_pcm_poll_descriptors(pcm, pollfd, n)) < 0) {
+ pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
+ pa_rtpoll_item_free(item);
+ return NULL;
+ }
+
+ return item;
+}
generated by cgit (git 2.34.1) at 2024-04-16 09:15:02 +0000