mirrors/pipewire
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/pipewire/pipewire.git synced 2025-10-29 05:40:27 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions
pipewire/spa/plugins/alsa/acp/alsa-util.c
Wim Taymans 20eb61b882 alsa: sync with pulseaudio
2021-02-25 10:28:25 +01:00

1865 lines
58 KiB
C
Raw Blame History

/***
This file is part of PulseAudio.
Copyright 2004-2009 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 2.1 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, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <alsa/asoundlib.h>
#include "alsa-util.h"
#include "alsa-mixer.h"
#ifdef HAVE_UDEV
#include <modules/udev-util.h>
#endif
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,
[PA_SAMPLE_S24LE] = SND_PCM_FORMAT_S24_3LE,
[PA_SAMPLE_S24BE] = SND_PCM_FORMAT_S24_3BE,
[PA_SAMPLE_S24_32LE] = SND_PCM_FORMAT_S24_LE,
[PA_SAMPLE_S24_32BE] = SND_PCM_FORMAT_S24_BE,
};
static const pa_sample_format_t try_order[] = {
PA_SAMPLE_FLOAT32NE,
PA_SAMPLE_FLOAT32RE,
PA_SAMPLE_S32NE,
PA_SAMPLE_S32RE,
PA_SAMPLE_S24_32NE,
PA_SAMPLE_S24_32RE,
PA_SAMPLE_S24NE,
PA_SAMPLE_S24RE,
PA_SAMPLE_S16NE,
PA_SAMPLE_S16RE,
PA_SAMPLE_ALAW,
PA_SAMPLE_ULAW,
PA_SAMPLE_U8
};
unsigned i;
int ret;
pa_assert(pcm_handle);
pa_assert(hwparams);
pa_assert(f);
if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
return ret;
pa_log_debug("snd_pcm_hw_params_set_format(%s) failed: %s",
snd_pcm_format_description(format_trans[*f]),
pa_alsa_strerror(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_S24BE)
*f = PA_SAMPLE_S24LE;
else if (*f == PA_SAMPLE_S24LE)
*f = PA_SAMPLE_S24BE;
else if (*f == PA_SAMPLE_S24_32BE)
*f = PA_SAMPLE_S24_32LE;
else if (*f == PA_SAMPLE_S24_32LE)
*f = PA_SAMPLE_S24_32BE;
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;
pa_log_debug("snd_pcm_hw_params_set_format(%s) failed: %s",
snd_pcm_format_description(format_trans[*f]),
pa_alsa_strerror(ret));
try_auto:
for (i = 0; i < PA_ELEMENTSOF(try_order); i++) {
*f = try_order[i];
if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
return ret;
pa_log_debug("snd_pcm_hw_params_set_format(%s) failed: %s",
snd_pcm_format_description(format_trans[*f]),
pa_alsa_strerror(ret));
}
return -1;
}
static int set_period_size(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, snd_pcm_uframes_t size) {
snd_pcm_uframes_t s;
int d, ret;
pa_assert(pcm_handle);
pa_assert(hwparams);
s = size;
d = 0;
if (snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, &s, &d) < 0) {
s = size;
d = -1;
if (snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, &s, &d) < 0) {
s = size;
d = 1;
if ((ret = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, &s, &d)) < 0) {
pa_log_info("snd_pcm_hw_params_set_period_size_near() failed: %s", pa_alsa_strerror(ret));
return ret;
}
}
}
return 0;
}
static int set_buffer_size(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, snd_pcm_uframes_t size) {
int ret;
pa_assert(pcm_handle);
pa_assert(hwparams);
if ((ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &size)) < 0) {
pa_log_info("snd_pcm_hw_params_set_buffer_size_near() failed: %s", pa_alsa_strerror(ret));
return ret;
}
return 0;
}
static void check_access(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, bool use_mmap) {
if ((use_mmap && !snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED)) ||
!snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED))
pa_log_error("Weird, PCM claims to support interleaved access, but snd_pcm_hw_params_set_access() failed.");
if ((use_mmap && !snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_NONINTERLEAVED)) ||
!snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_NONINTERLEAVED))
pa_log_debug("PCM seems to support non-interleaved access, but PA doesn't.");
else if (use_mmap && !snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_COMPLEX)) {
pa_log_debug("PCM seems to support mmapped complex access, but PA doesn't.");
}
}
/* Set the hardware parameters of the given ALSA device. Returns the
* selected fragment settings in *buffer_size and *period_size. Determine
* whether mmap and tsched mode can be enabled. */
int pa_alsa_set_hw_params(
snd_pcm_t *pcm_handle,
pa_sample_spec *ss,
snd_pcm_uframes_t *period_size,
snd_pcm_uframes_t *buffer_size,
snd_pcm_uframes_t tsched_size,
bool *use_mmap,
bool *use_tsched,
bool require_exact_channel_number) {
int ret = -1;
snd_pcm_hw_params_t *hwparams, *hwparams_copy;
int dir;
snd_pcm_uframes_t _period_size = period_size ? *period_size : 0;
snd_pcm_uframes_t _buffer_size = buffer_size ? *buffer_size : 0;
bool _use_mmap = use_mmap && *use_mmap;
bool _use_tsched = use_tsched && *use_tsched;
pa_sample_spec _ss = *ss;
pa_assert(pcm_handle);
pa_assert(ss);
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_hw_params_alloca(&hwparams_copy);
if ((ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0) {
pa_log_debug("snd_pcm_hw_params_any() failed: %s", pa_alsa_strerror(ret));
goto finish;
}
if ((ret = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 0)) < 0) {
pa_log_debug("snd_pcm_hw_params_set_rate_resample() failed: %s", pa_alsa_strerror(ret));
goto finish;
}
if (_use_mmap) {
if (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) {
pa_log_debug("snd_pcm_hw_params_set_access() failed: %s", pa_alsa_strerror(ret));
check_access(pcm_handle, hwparams, true);
goto finish;
}
_use_mmap = false;
}
} else if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
pa_log_debug("snd_pcm_hw_params_set_access() failed: %s", pa_alsa_strerror(ret));
check_access(pcm_handle, hwparams, false);
goto finish;
}
if (!_use_mmap)
_use_tsched = false;
if (!pa_alsa_pcm_is_hw(pcm_handle))
_use_tsched = false;
/* The PCM pointer is only updated with period granularity */
if (snd_pcm_hw_params_is_batch(hwparams)) {
bool is_usb = false;
const char *id;
snd_pcm_info_t* pcm_info;
snd_pcm_info_alloca(&pcm_info);
if (snd_pcm_info(pcm_handle, pcm_info) == 0 &&
(id = snd_pcm_info_get_id(pcm_info))) {
/* This horrible hack makes sure we don't disable tsched on USB
* devices, which have a low enough transfer size for timer-based
* scheduling to work. This can go away when the ALSA API supports
* querying the block transfer size. */
if (pa_streq(id, "USB Audio"))
is_usb = true;
}
if (!is_usb) {
pa_log_info("Disabling tsched mode since BATCH flag is set");
_use_tsched = false;
}
}
#if (SND_LIB_VERSION >= ((1<<16)|(0<<8)|24)) /* API additions in 1.0.24 */
if (_use_tsched) {
/* try to disable period wakeups if hardware can do so */
if (snd_pcm_hw_params_can_disable_period_wakeup(hwparams)) {
if ((ret = snd_pcm_hw_params_set_period_wakeup(pcm_handle, hwparams, false)) < 0)
/* don't bail, keep going with default mode with period wakeups */
pa_log_debug("snd_pcm_hw_params_set_period_wakeup() failed: %s", pa_alsa_strerror(ret));
else
pa_log_info("Trying to disable ALSA period wakeups, using timers only");
} else
pa_log_info("Cannot disable ALSA period wakeups");
}
#endif
if ((ret = set_format(pcm_handle, hwparams, &_ss.format)) < 0)
goto finish;
if ((ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &_ss.rate, NULL)) < 0) {
pa_log_debug("snd_pcm_hw_params_set_rate_near() failed: %s", pa_alsa_strerror(ret));
goto finish;
}
/* We ignore very small sampling rate deviations */
if (_ss.rate >= ss->rate*.95 && _ss.rate <= ss->rate*1.05)
_ss.rate = ss->rate;
if (require_exact_channel_number) {
if ((ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, _ss.channels)) < 0) {
pa_log_debug("snd_pcm_hw_params_set_channels(%u) failed: %s", _ss.channels, pa_alsa_strerror(ret));
goto finish;
}
} else {
unsigned int c = _ss.channels;
if ((ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0) {
pa_log_debug("snd_pcm_hw_params_set_channels_near(%u) failed: %s", _ss.channels, pa_alsa_strerror(ret));
goto finish;
}
_ss.channels = c;
}
if (_use_tsched && tsched_size > 0) {
_buffer_size = (snd_pcm_uframes_t) (((uint64_t) tsched_size * _ss.rate) / ss->rate);
_period_size = _buffer_size;
} else {
_period_size = (snd_pcm_uframes_t) (((uint64_t) _period_size * _ss.rate) / ss->rate);
_buffer_size = (snd_pcm_uframes_t) (((uint64_t) _buffer_size * _ss.rate) / ss->rate);
}
if (_buffer_size > 0 || _period_size > 0) {
snd_pcm_uframes_t max_frames = 0;
if ((ret = snd_pcm_hw_params_get_buffer_size_max(hwparams, &max_frames)) < 0)
pa_log_warn("snd_pcm_hw_params_get_buffer_size_max() failed: %s", pa_alsa_strerror(ret));
else
pa_log_debug("Maximum hw buffer size is %lu ms", (long unsigned) (max_frames * PA_MSEC_PER_SEC / _ss.rate));
/* Some ALSA drivers really don't like if we set the buffer
* size first and the number of periods second (which would
* make a lot more sense to me). So, try a few combinations
* before we give up. */
if (_buffer_size > 0 && _period_size > 0) {
snd_pcm_hw_params_copy(hwparams_copy, hwparams);
/* First try: set buffer size first, followed by period size */
if (set_buffer_size(pcm_handle, hwparams_copy, _buffer_size) >= 0 &&
set_period_size(pcm_handle, hwparams_copy, _period_size) >= 0 &&
snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) {
pa_log_debug("Set buffer size first (to %lu samples), period size second (to %lu samples).", (unsigned long) _buffer_size, (unsigned long) _period_size);
goto success;
}
snd_pcm_hw_params_copy(hwparams_copy, hwparams);
/* Second try: set period size first, followed by buffer size */
if (set_period_size(pcm_handle, hwparams_copy, _period_size) >= 0 &&
set_buffer_size(pcm_handle, hwparams_copy, _buffer_size) >= 0 &&
snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) {
pa_log_debug("Set period size first (to %lu samples), buffer size second (to %lu samples).", (unsigned long) _period_size, (unsigned long) _buffer_size);
goto success;
}
}
if (_buffer_size > 0) {
snd_pcm_hw_params_copy(hwparams_copy, hwparams);
/* Third try: set only buffer size */
if (set_buffer_size(pcm_handle, hwparams_copy, _buffer_size) >= 0 &&
snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) {
pa_log_debug("Set only buffer size (to %lu samples).", (unsigned long) _buffer_size);
goto success;
}
}
if (_period_size > 0) {
snd_pcm_hw_params_copy(hwparams_copy, hwparams);
/* Fourth try: set only period size */
if (set_period_size(pcm_handle, hwparams_copy, _period_size) >= 0 &&
snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) {
pa_log_debug("Set only period size (to %lu samples).", (unsigned long) _period_size);
goto success;
}
}
}
pa_log_debug("Set neither period nor buffer size.");
/* Last chance, set nothing */
if ((ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0) {
pa_log_info("snd_pcm_hw_params failed: %s", pa_alsa_strerror(ret));
goto finish;
}
success:
if (ss->rate != _ss.rate)
pa_log_info("Device %s doesn't support %u Hz, changed to %u Hz.", snd_pcm_name(pcm_handle), ss->rate, _ss.rate);
if (ss->channels != _ss.channels)
pa_log_info("Device %s doesn't support %u channels, changed to %u.", snd_pcm_name(pcm_handle), ss->channels, _ss.channels);
if (ss->format != _ss.format)
pa_log_info("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(_ss.format));
if ((ret = snd_pcm_hw_params_current(pcm_handle, hwparams)) < 0) {
pa_log_info("snd_pcm_hw_params_current() failed: %s", pa_alsa_strerror(ret));
goto finish;
}
if ((ret = snd_pcm_hw_params_get_period_size(hwparams, &_period_size, &dir)) < 0 ||
(ret = snd_pcm_hw_params_get_buffer_size(hwparams, &_buffer_size)) < 0) {
pa_log_info("snd_pcm_hw_params_get_{period|buffer}_size() failed: %s", pa_alsa_strerror(ret));
goto finish;
}
#if (SND_LIB_VERSION >= ((1<<16)|(0<<8)|24)) /* API additions in 1.0.24 */
if (_use_tsched) {
unsigned int no_wakeup;
/* see if period wakeups were disabled */
snd_pcm_hw_params_get_period_wakeup(pcm_handle, hwparams, &no_wakeup);
if (no_wakeup == 0)
pa_log_info("ALSA period wakeups disabled");
else
pa_log_info("ALSA period wakeups were not disabled");
}
#endif
ss->rate = _ss.rate;
ss->channels = _ss.channels;
ss->format = _ss.format;
pa_assert(_period_size > 0);
pa_assert(_buffer_size > 0);
if (buffer_size)
*buffer_size = _buffer_size;
if (period_size)
*period_size = _period_size;
if (use_mmap)
*use_mmap = _use_mmap;
if (use_tsched)
*use_tsched = _use_tsched;
ret = 0;
finish:
return ret;
}
int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min, bool period_event) {
snd_pcm_sw_params_t *swparams;
snd_pcm_uframes_t boundary;
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", pa_alsa_strerror(err));
return err;
}
if ((err = snd_pcm_sw_params_set_period_event(pcm, swparams, period_event)) < 0) {
pa_log_warn("Unable to disable period event: %s", pa_alsa_strerror(err));
return err;
}
if ((err = snd_pcm_sw_params_set_tstamp_mode(pcm, swparams, SND_PCM_TSTAMP_ENABLE)) < 0) {
pa_log_warn("Unable to enable time stamping: %s", pa_alsa_strerror(err));
return err;
}
if ((err = snd_pcm_sw_params_get_boundary(swparams, &boundary)) < 0) {
pa_log_warn("Unable to get boundary: %s", pa_alsa_strerror(err));
return err;
}
if ((err = snd_pcm_sw_params_set_stop_threshold(pcm, swparams, boundary)) < 0) {
pa_log_warn("Unable to set stop threshold: %s", pa_alsa_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", pa_alsa_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", pa_alsa_strerror(err));
return err;
}
if ((err = snd_pcm_sw_params(pcm, swparams)) < 0) {
pa_log_warn("Unable to set sw params: %s", pa_alsa_strerror(err));
return err;
}
return 0;
}
#if 0
snd_pcm_t *pa_alsa_open_by_device_id_auto(
const char *dev_id,
char **dev,
pa_sample_spec *ss,
pa_channel_map* map,
int mode,
snd_pcm_uframes_t *period_size,
snd_pcm_uframes_t *buffer_size,
snd_pcm_uframes_t tsched_size,
bool *use_mmap,
bool *use_tsched,
pa_alsa_profile_set *ps,
pa_alsa_mapping **mapping) {
char *d;
snd_pcm_t *pcm_handle;
void *state;
pa_alsa_mapping *m;
pa_assert(dev_id);
pa_assert(dev);
pa_assert(ss);
pa_assert(map);
pa_assert(ps);
/* First we try to find a device string with a superset of the
* requested channel map. 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.*/
PA_HASHMAP_FOREACH(m, ps->mappings, state) {
if (!pa_channel_map_superset(&m->channel_map, map))
continue;
pa_log_debug("Checking for superset %s (%s)", m->name, m->device_strings[0]);
pcm_handle = pa_alsa_open_by_device_id_mapping(
dev_id,
dev,
ss,
map,
mode,
period_size,
buffer_size,
tsched_size,
use_mmap,
use_tsched,
m);
if (pcm_handle) {
if (mapping)
*mapping = m;
return pcm_handle;
}
}
PA_HASHMAP_FOREACH_BACKWARDS(m, ps->mappings, state) {
if (pa_channel_map_superset(&m->channel_map, map))
continue;
pa_log_debug("Checking for subset %s (%s)", m->name, m->device_strings[0]);
pcm_handle = pa_alsa_open_by_device_id_mapping(
dev_id,
dev,
ss,
map,
mode,
period_size,
buffer_size,
tsched_size,
use_mmap,
use_tsched,
m);
if (pcm_handle) {
if (mapping)
*mapping = m;
return pcm_handle;
}
}
/* OK, we didn't find any good device, so let's try the raw hw: 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,
period_size,
buffer_size,
tsched_size,
use_mmap,
use_tsched,
false);
pa_xfree(d);
if (pcm_handle && mapping)
*mapping = NULL;
return pcm_handle;
}
#endif
snd_pcm_t *pa_alsa_open_by_device_id_mapping(
const char *dev_id,
char **dev,
pa_sample_spec *ss,
pa_channel_map* map,
int mode,
snd_pcm_uframes_t *period_size,
snd_pcm_uframes_t *buffer_size,
snd_pcm_uframes_t tsched_size,
bool *use_mmap,
bool *use_tsched,
pa_alsa_mapping *m) {
snd_pcm_t *pcm_handle;
pa_sample_spec try_ss;
pa_channel_map try_map;
pa_assert(dev_id);
pa_assert(dev);
pa_assert(ss);
pa_assert(map);
pa_assert(m);
try_ss.channels = m->channel_map.channels;
try_ss.rate = ss->rate;
try_ss.format = ss->format;
try_map = m->channel_map;
pcm_handle = pa_alsa_open_by_template(
m->device_strings,
dev_id,
dev,
&try_ss,
&try_map,
mode,
period_size,
buffer_size,
tsched_size,
use_mmap,
use_tsched,
pa_channel_map_valid(&m->channel_map) /* Query the channel count if we don't know what we want */);
if (!pcm_handle)
return NULL;
*ss = try_ss;
*map = try_map;
pa_assert(map->channels == ss->channels);
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,
snd_pcm_uframes_t *period_size,
snd_pcm_uframes_t *buffer_size,
snd_pcm_uframes_t tsched_size,
bool *use_mmap,
bool *use_tsched,
bool require_exact_channel_number) {
int err;
char *d;
snd_pcm_t *pcm_handle;
bool reformat = false;
pa_assert(device);
pa_assert(ss);
pa_assert(map);
d = pa_xstrdup(device);
for (;;) {
pa_log_debug("Trying %s %s SND_PCM_NO_AUTO_FORMAT ...", d, reformat ? "without" : "with");
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("Error opening PCM device %s: %s", d, pa_alsa_strerror(err));
goto fail;
}
pa_log_debug("Managed to open %s", d);
if ((err = pa_alsa_set_hw_params(
pcm_handle,
ss,
period_size,
buffer_size,
tsched_size,
use_mmap,
use_tsched,
require_exact_channel_number)) < 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:SLAVE='%s'", d);
pa_xfree(d);
d = t;
reformat = false;
snd_pcm_close(pcm_handle);
continue;
}
pa_log_info("Failed to set hardware parameters on %s: %s", d, pa_alsa_strerror(err));
snd_pcm_close(pcm_handle);
goto fail;
}
if (ss->channels > PA_CHANNELS_MAX) {
pa_log("Device %s has %u channels, but PulseAudio supports only %u channels. Unable to use the device.",
d, ss->channels, PA_CHANNELS_MAX);
snd_pcm_close(pcm_handle);
goto fail;
}
if (dev)
*dev = d;
else
pa_xfree(d);
if (ss->channels != map->channels)
pa_channel_map_init_extend(map, ss->channels, PA_CHANNEL_MAP_ALSA);
return pcm_handle;
}
fail:
pa_xfree(d);
return NULL;
}
snd_pcm_t *pa_alsa_open_by_template(
char **template,
const char *dev_id,
char **dev,
pa_sample_spec *ss,
pa_channel_map* map,
int mode,
snd_pcm_uframes_t *period_size,
snd_pcm_uframes_t *buffer_size,
snd_pcm_uframes_t tsched_size,
bool *use_mmap,
bool *use_tsched,
bool require_exact_channel_number) {
snd_pcm_t *pcm_handle;
char **i;
for (i = template; *i; i++) {
char *d;
d = pa_replace(*i, "%f", dev_id);
pcm_handle = pa_alsa_open_by_device_string(
d,
dev,
ss,
map,
mode,
period_size,
buffer_size,
tsched_size,
use_mmap,
use_tsched,
require_exact_channel_number);
pa_xfree(d);
if (pcm_handle)
return pcm_handle;
}
return NULL;
}
void pa_alsa_dump(pa_log_level_t level, 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_logl(level, "snd_pcm_dump(): %s", pa_alsa_strerror(err));
else {
char *s = NULL;
snd_output_buffer_string(out, &s);
pa_logl(level, "snd_pcm_dump():\n%s", pa_strnull(s));
}
pa_assert_se(snd_output_close(out) == 0);
}
#if 0
void pa_alsa_dump_status(snd_pcm_t *pcm) {
int err;
snd_output_t *out;
snd_pcm_status_t *status;
char *s = NULL;
pa_assert(pcm);
snd_pcm_status_alloca(&status);
if ((err = snd_output_buffer_open(&out)) < 0) {
pa_log_debug("snd_output_buffer_open() failed: %s", pa_cstrerror(err));
return;
}
if ((err = snd_pcm_status(pcm, status)) < 0) {
pa_log_debug("snd_pcm_status() failed: %s", pa_cstrerror(err));
goto finish;
}
if ((err = snd_pcm_status_dump(status, out)) < 0) {
pa_log_debug("snd_pcm_status_dump(): %s", pa_alsa_strerror(err));
goto finish;
}
snd_output_buffer_string(out, &s);
pa_log_debug("snd_pcm_status_dump():\n%s", pa_strnull(s));
finish:
snd_output_close(out);
}
#endif
static PA_PRINTF_FUNC(5,6) 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, file, line, function, fmt, ap);
va_end(ap);
// pa_xfree(alsa_file);
}
static int n_error_handler_installed = 0;
typedef void (*snd_lib2_error_handler_t)(const char *file, int line, const char *function, int err, const char *fmt, ...) PA_PRINTF_FUNC(5,6) /* __attribute__ ((format (printf, 5, 6))) */;
extern int snd_lib_error_set_handler(snd_lib2_error_handler_t handler);
void pa_alsa_refcnt_inc(void) {
/* This is not really thread safe, but we do our best */
if (n_error_handler_installed++ == 0)
snd_lib_error_set_handler(alsa_error_handler);
}
void pa_alsa_refcnt_dec(void) {
int r;
pa_assert_se((r = n_error_handler_installed--) >= 1);
if (r == 1) {
snd_lib_error_set_handler(NULL);
snd_config_update_free_global();
}
}
bool pa_alsa_init_description(pa_proplist *p, pa_card *card) {
const char *d, *k;
pa_assert(p);
if (pa_alsa_device_init_description(p, card))
return true;
if (!(d = pa_proplist_gets(p, "alsa.card_name")))
d = pa_proplist_gets(p, "alsa.name");
if (!d)
return false;
k = pa_proplist_gets(p, PA_PROP_DEVICE_PROFILE_DESCRIPTION);
if (d && k)
pa_proplist_setf(p, PA_PROP_DEVICE_DESCRIPTION, "%s %s", d, k);
else if (d)
pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, d);
return false;
}
void pa_alsa_init_proplist_card(pa_core *c, pa_proplist *p, int card) {
char *cn, *lcn, *dn;
pa_assert(p);
pa_assert(card >= 0);
pa_proplist_setf(p, "alsa.card", "%i", card);
if (snd_card_get_name(card, &cn) >= 0) {
pa_proplist_sets(p, "alsa.card_name", pa_strip(cn));
free(cn);
}
if (snd_card_get_longname(card, &lcn) >= 0) {
pa_proplist_sets(p, "alsa.long_card_name", pa_strip(lcn));
free(lcn);
}
if ((dn = pa_alsa_get_driver_name(card))) {
pa_proplist_sets(p, "alsa.driver_name", dn);
pa_xfree(dn);
}
#ifdef HAVE_UDEV
pa_udev_get_info(card, p);
#endif
}
void pa_alsa_init_proplist_pcm_info(pa_core *c, 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;
int card;
pa_assert(p);
pa_assert(pcm_info);
pa_proplist_sets(p, PA_PROP_DEVICE_API, "alsa");
if ((class = snd_pcm_info_get_class(pcm_info)) <= 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]);
}
if ((subclass = snd_pcm_info_get_subclass(pcm_info)) <= 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))) {
char *t = pa_xstrdup(n);
pa_proplist_sets(p, "alsa.name", pa_strip(t));
pa_xfree(t);
}
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_alsa_init_proplist_card(c, p, card);
}
void pa_alsa_init_proplist_pcm(pa_core *c, pa_proplist *p, snd_pcm_t *pcm) {
snd_pcm_hw_params_t *hwparams;
snd_pcm_info_t *info;
int bits, err;
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_info_alloca(&info);
if ((err = snd_pcm_hw_params_current(pcm, hwparams)) < 0)
pa_log_warn("Error fetching hardware parameter info: %s", pa_alsa_strerror(err));
else {
if ((bits = snd_pcm_hw_params_get_sbits(hwparams)) >= 0)
pa_proplist_setf(p, "alsa.resolution_bits", "%i", bits);
}
if ((err = snd_pcm_info(pcm, info)) < 0)
pa_log_warn("Error fetching PCM info: %s", pa_alsa_strerror(err));
else
pa_alsa_init_proplist_pcm_info(c, p, info);
}
#if 0
void pa_alsa_init_proplist_ctl(pa_proplist *p, const char *name) {
int err;
snd_ctl_t *ctl;
snd_ctl_card_info_t *info;
const char *t;
pa_assert(p);
snd_ctl_card_info_alloca(&info);
if ((err = snd_ctl_open(&ctl, name, 0)) < 0) {
pa_log_warn("Error opening low-level control device '%s': %s", name, snd_strerror(err));
return;
}
if ((err = snd_ctl_card_info(ctl, info)) < 0) {
pa_log_warn("Control device %s card info: %s", name, snd_strerror(err));
snd_ctl_close(ctl);
return;
}
if ((t = snd_ctl_card_info_get_mixername(info)) && *t)
pa_proplist_sets(p, "alsa.mixer_name", t);
if ((t = snd_ctl_card_info_get_components(info)) && *t)
pa_proplist_sets(p, "alsa.components", t);
snd_ctl_close(ctl);
}
int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) {
snd_pcm_state_t state;
snd_pcm_hw_params_t *hwparams;
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_DISCONNECTED:
/* Do not try to recover */
pa_log_info("Device disconnected.");
return -1;
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", pa_alsa_strerror(err));
return -1;
}
break;
case SND_PCM_STATE_SUSPENDED:
snd_pcm_hw_params_alloca(&hwparams);
if ((err = snd_pcm_hw_params_any(pcm, hwparams)) < 0) {
pa_log_debug("snd_pcm_hw_params_any() failed: %s", pa_alsa_strerror(err));
return -1;
}
if (snd_pcm_hw_params_can_resume(hwparams)) {
/* Retry resume 3 times before giving up, then fallback to restarting the stream. */
for (int i = 0; i < 3; i++) {
if ((err = snd_pcm_resume(pcm)) == 0)
return 0;
if (err != -EAGAIN)
break;
pa_msleep(25);
}
pa_log_warn("Could not recover alsa device from SUSPENDED state, trying to restart PCM");
}
/* Fall through */
default:
snd_pcm_drop(pcm);
return 1;
}
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", pa_alsa_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", pa_alsa_strerror(err));
pa_rtpoll_item_free(item);
return NULL;
}
return item;
}
snd_pcm_sframes_t pa_alsa_safe_avail(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(pcm);
if (n <= 0)
return n;
k = (size_t) n * pa_frame_size(ss);
if (PA_UNLIKELY(k >= hwbuf_size * 5 ||
k >= pa_bytes_per_second(ss)*10)) {
PA_ONCE_BEGIN {
char *dn = pa_alsa_get_driver_name_by_pcm(pcm);
pa_log_debug(ngettext("snd_pcm_avail() returned a value that is exceptionally large: %lu byte (%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.",
"snd_pcm_avail() returned a value that is exceptionally large: %lu bytes (%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.",
(unsigned long) k),
(unsigned long) k,
(unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC),
pa_strnull(dn));
pa_xfree(dn);
pa_alsa_dump(PA_LOG_DEBUG, pcm);
} PA_ONCE_END;
/* Mhmm, let's try not to fail completely */
n = (snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss));
}
return n;
}
int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_status_t *status, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss,
bool capture) {
ssize_t k;
size_t abs_k;
int err;
snd_pcm_sframes_t avail = 0;
#if (SND_LIB_VERSION >= ((1<<16)|(1<<8)|0)) /* API additions in 1.1.0 */
snd_pcm_audio_tstamp_config_t tstamp_config;
#endif
pa_assert(pcm);
pa_assert(delay);
pa_assert(hwbuf_size > 0);
pa_assert(ss);
/* Some ALSA driver expose weird bugs, let's inform the user about
* what is going on. We're going to get both the avail and delay values so
* that we can compare and check them for capture.
* This is done with snd_pcm_status() which provides
* avail, delay and timestamp values in a single kernel call to improve
* timer-based scheduling */
#if (SND_LIB_VERSION >= ((1<<16)|(1<<8)|0)) /* API additions in 1.1.0 */
/* The time stamp configuration needs to be set so that the
* ALSA code will use the internal delay reported by the driver.
* The time stamp configuration was introduced in alsa version 1.1.0. */
tstamp_config.type_requested = 1; /* ALSA default time stamp type */
tstamp_config.report_delay = 1;
snd_pcm_status_set_audio_htstamp_config(status, &tstamp_config);
#endif
if ((err = snd_pcm_status(pcm, status)) < 0)
return err;
avail = snd_pcm_status_get_avail(status);
*delay = snd_pcm_status_get_delay(status);
k = (ssize_t) *delay * (ssize_t) pa_frame_size(ss);
abs_k = k >= 0 ? (size_t) k : (size_t) -k;
if (PA_UNLIKELY(abs_k >= hwbuf_size * 5 ||
abs_k >= pa_bytes_per_second(ss)*10)) {
PA_ONCE_BEGIN {
char *dn = pa_alsa_get_driver_name_by_pcm(pcm);
pa_log_debug(ngettext("snd_pcm_delay() returned a value that is exceptionally large: %li byte (%s%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.",
"snd_pcm_delay() returned a value that is exceptionally large: %li bytes (%s%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.",
(signed long) k),
(signed long) k,
k < 0 ? "-" : "",
(unsigned long) (pa_bytes_to_usec(abs_k, ss) / PA_USEC_PER_MSEC),
pa_strnull(dn));
pa_xfree(dn);
pa_alsa_dump(PA_LOG_DEBUG, pcm);
} PA_ONCE_END;
/* Mhmm, let's try not to fail completely */
if (k < 0)
*delay = -(snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss));
else
*delay = (snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss));
}
if (capture) {
abs_k = (size_t) avail * pa_frame_size(ss);
if (PA_UNLIKELY(abs_k >= hwbuf_size * 5 ||
abs_k >= pa_bytes_per_second(ss)*10)) {
PA_ONCE_BEGIN {
char *dn = pa_alsa_get_driver_name_by_pcm(pcm);
pa_log_debug(ngettext("snd_pcm_avail() returned a value that is exceptionally large: %lu byte (%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.",
"snd_pcm_avail() returned a value that is exceptionally large: %lu bytes (%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.",
(unsigned long) k),
(unsigned long) k,
(unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC),
pa_strnull(dn));
pa_xfree(dn);
pa_alsa_dump(PA_LOG_DEBUG, pcm);
} PA_ONCE_END;
/* Mhmm, let's try not to fail completely */
avail = (snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss));
}
if (PA_UNLIKELY(*delay < avail)) {
PA_ONCE_BEGIN {
char *dn = pa_alsa_get_driver_name_by_pcm(pcm);
pa_log(_("snd_pcm_avail_delay() returned strange values: delay %lu is less than avail %lu.\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers."),
(unsigned long) *delay,
(unsigned long) avail,
pa_strnull(dn));
pa_xfree(dn);
pa_alsa_dump(PA_LOG_ERROR, pcm);
} PA_ONCE_END;
/* try to fixup */
*delay = avail;
}
}
return 0;
}
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 (PA_UNLIKELY(*frames > before ||
k >= hwbuf_size * 3 ||
k >= pa_bytes_per_second(ss)*10))
PA_ONCE_BEGIN {
char *dn = pa_alsa_get_driver_name_by_pcm(pcm);
pa_log_debug(ngettext("snd_pcm_mmap_begin() returned a value that is exceptionally large: %lu byte (%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.",
"snd_pcm_mmap_begin() returned a value that is exceptionally large: %lu bytes (%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.",
(unsigned long) k),
(unsigned long) k,
(unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC),
pa_strnull(dn));
pa_xfree(dn);
pa_alsa_dump(PA_LOG_DEBUG, pcm);
} PA_ONCE_END;
return r;
}
#endif
char *pa_alsa_get_driver_name(int card) {
char *t, *m, *n;
pa_assert(card >= 0);
t = pa_sprintf_malloc("/sys/class/sound/card%i/device/driver/module", card);
m = pa_readlink(t);
pa_xfree(t);
if (!m)
return NULL;
n = pa_xstrdup(pa_path_get_filename(m));
pa_xfree(m);
return n;
}
char *pa_alsa_get_driver_name_by_pcm(snd_pcm_t *pcm) {
int card;
snd_pcm_info_t* info;
snd_pcm_info_alloca(&info);
pa_assert(pcm);
if (snd_pcm_info(pcm, info) < 0)
return NULL;
if ((card = snd_pcm_info_get_card(info)) < 0)
return NULL;
return pa_alsa_get_driver_name(card);
}
#if 0
char *pa_alsa_get_reserve_name(const char *device) {
const char *t;
int i;
pa_assert(device);
if ((t = strchr(device, ':')))
device = t+1;
if ((i = snd_card_get_index(device)) < 0) {
int32_t k;
if (pa_atoi(device, &k) < 0)
return NULL;
i = (int) k;
}
return pa_sprintf_malloc("Audio%i", i);
}
unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm, unsigned int fallback_rate) {
static unsigned int all_rates[] = { 8000, 11025, 12000,
16000, 22050, 24000,
32000, 44100, 48000,
64000, 88200, 96000,
128000, 176400, 192000,
384000 };
bool supported[PA_ELEMENTSOF(all_rates)] = { false, };
snd_pcm_hw_params_t *hwparams;
unsigned int i, j, n, *rates = NULL;
int ret;
snd_pcm_hw_params_alloca(&hwparams);
if ((ret = snd_pcm_hw_params_any(pcm, hwparams)) < 0) {
pa_log_debug("snd_pcm_hw_params_any() failed: %s", pa_alsa_strerror(ret));
return NULL;
}
for (i = 0, n = 0; i < PA_ELEMENTSOF(all_rates); i++) {
if (snd_pcm_hw_params_test_rate(pcm, hwparams, all_rates[i], 0) == 0) {
supported[i] = true;
n++;
}
}
if (n > 0) {
rates = pa_xnew(unsigned int, n + 1);
for (i = 0, j = 0; i < PA_ELEMENTSOF(all_rates); i++) {
if (supported[i])
rates[j++] = all_rates[i];
}
rates[j] = 0;
} else {
rates = pa_xnew(unsigned int, 2);
rates[0] = fallback_rate;
if ((ret = snd_pcm_hw_params_set_rate_near(pcm, hwparams, &rates[0], NULL)) < 0) {
pa_log_debug("snd_pcm_hw_params_set_rate_near() failed: %s", pa_alsa_strerror(ret));
pa_xfree(rates);
return NULL;
}
rates[1] = 0;
}
return rates;
}
pa_sample_format_t *pa_alsa_get_supported_formats(snd_pcm_t *pcm, pa_sample_format_t fallback_format) {
static const snd_pcm_format_t format_trans_to_pa[] = {
[SND_PCM_FORMAT_U8] = PA_SAMPLE_U8,
[SND_PCM_FORMAT_A_LAW] = PA_SAMPLE_ALAW,
[SND_PCM_FORMAT_MU_LAW] = PA_SAMPLE_ULAW,
[SND_PCM_FORMAT_S16_LE] = PA_SAMPLE_S16LE,
[SND_PCM_FORMAT_S16_BE] = PA_SAMPLE_S16BE,
[SND_PCM_FORMAT_FLOAT_LE] = PA_SAMPLE_FLOAT32LE,
[SND_PCM_FORMAT_FLOAT_BE] = PA_SAMPLE_FLOAT32BE,
[SND_PCM_FORMAT_S32_LE] = PA_SAMPLE_S32LE,
[SND_PCM_FORMAT_S32_BE] = PA_SAMPLE_S32BE,
[SND_PCM_FORMAT_S24_3LE] = PA_SAMPLE_S24LE,
[SND_PCM_FORMAT_S24_3BE] = PA_SAMPLE_S24BE,
[SND_PCM_FORMAT_S24_LE] = PA_SAMPLE_S24_32LE,
[SND_PCM_FORMAT_S24_BE] = PA_SAMPLE_S24_32BE,
};
static const snd_pcm_format_t all_formats[] = {
SND_PCM_FORMAT_U8,
SND_PCM_FORMAT_A_LAW,
SND_PCM_FORMAT_MU_LAW,
SND_PCM_FORMAT_S16_LE,
SND_PCM_FORMAT_S16_BE,
SND_PCM_FORMAT_FLOAT_LE,
SND_PCM_FORMAT_FLOAT_BE,
SND_PCM_FORMAT_S32_LE,
SND_PCM_FORMAT_S32_BE,
SND_PCM_FORMAT_S24_3LE,
SND_PCM_FORMAT_S24_3BE,
SND_PCM_FORMAT_S24_LE,
SND_PCM_FORMAT_S24_BE,
};
bool supported[PA_ELEMENTSOF(all_formats)] = {
false,
};
snd_pcm_hw_params_t *hwparams;
unsigned int i, j, n;
pa_sample_format_t *formats = NULL;
int ret;
snd_pcm_hw_params_alloca(&hwparams);
if ((ret = snd_pcm_hw_params_any(pcm, hwparams)) < 0) {
pa_log_debug("snd_pcm_hw_params_any() failed: %s", pa_alsa_strerror(ret));
return NULL;
}
for (i = 0, n = 0; i < PA_ELEMENTSOF(all_formats); i++) {
if (snd_pcm_hw_params_test_format(pcm, hwparams, all_formats[i]) == 0) {
supported[i] = true;
n++;
}
}
if (n > 0) {
formats = pa_xnew(pa_sample_format_t, n + 1);
for (i = 0, j = 0; i < PA_ELEMENTSOF(all_formats); i++) {
if (supported[i])
formats[j++] = format_trans_to_pa[all_formats[i]];
}
formats[j] = PA_SAMPLE_MAX;
} else {
formats = pa_xnew(pa_sample_format_t, 2);
formats[0] = fallback_format;
if ((ret = snd_pcm_hw_params_set_format(pcm, hwparams, format_trans_to_pa[formats[0]])) < 0) {
pa_log_debug("snd_pcm_hw_params_set_format() failed: %s", pa_alsa_strerror(ret));
pa_xfree(formats);
return NULL;
}
formats[1] = PA_SAMPLE_MAX;
}
return formats;
}
#endif
bool pa_alsa_pcm_is_hw(snd_pcm_t *pcm) {
snd_pcm_info_t* info;
snd_pcm_info_alloca(&info);
pa_assert(pcm);
if (snd_pcm_info(pcm, info) < 0)
return false;
return snd_pcm_info_get_card(info) >= 0;
}
bool pa_alsa_pcm_is_modem(snd_pcm_t *pcm) {
snd_pcm_info_t* info;
snd_pcm_info_alloca(&info);
pa_assert(pcm);
if (snd_pcm_info(pcm, info) < 0)
return false;
return snd_pcm_info_get_class(info) == SND_PCM_CLASS_MODEM;
}
const char* pa_alsa_strerror(int errnum) {
return snd_strerror(errnum);
}
#if 0
bool pa_alsa_may_tsched(bool want) {
if (!want)
return false;
if (!pa_rtclock_hrtimer()) {
/* We cannot depend on being woken up in time when the timers
are inaccurate, so let's fallback to classic IO based playback
then. */
pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel.");
return false; }
if (pa_running_in_vm()) {
/* We cannot depend on being woken up when we ask for in a VM,
* so let's fallback to classic IO based playback then. */
pa_log_notice("Disabling timer-based scheduling because running inside a VM.");
return false;
}
return true;
}
#endif
#define SND_MIXER_ELEM_PULSEAUDIO (SND_MIXER_ELEM_LAST + 10)
static snd_mixer_elem_t *pa_alsa_mixer_find(snd_mixer_t *mixer,
snd_ctl_elem_iface_t iface,
const char *name,
unsigned int index,
unsigned int device) {
snd_mixer_elem_t *elem;
for (elem = snd_mixer_first_elem(mixer); elem; elem = snd_mixer_elem_next(elem)) {
snd_hctl_elem_t *helem;
if (snd_mixer_elem_get_type(elem) != SND_MIXER_ELEM_PULSEAUDIO)
continue;
helem = snd_mixer_elem_get_private(elem);
if (snd_hctl_elem_get_interface(helem) != iface)
continue;
if (!pa_streq(snd_hctl_elem_get_name(helem), name))
continue;
if (snd_hctl_elem_get_index(helem) != index)
continue;
if (snd_hctl_elem_get_device(helem) != device)
continue;
return elem;
}
return NULL;
}
snd_mixer_elem_t *pa_alsa_mixer_find_card(snd_mixer_t *mixer, struct pa_alsa_mixer_id *alsa_id, unsigned int device) {
return pa_alsa_mixer_find(mixer, SND_CTL_ELEM_IFACE_CARD, alsa_id->name, alsa_id->index, device);
}
snd_mixer_elem_t *pa_alsa_mixer_find_pcm(snd_mixer_t *mixer, const char *name, unsigned int device) {
return pa_alsa_mixer_find(mixer, SND_CTL_ELEM_IFACE_PCM, name, 0, device);
}
static int mixer_class_compare(const snd_mixer_elem_t *c1, const snd_mixer_elem_t *c2)
{
/* Dummy compare function */
return c1 == c2 ? 0 : (c1 > c2 ? 1 : -1);
}
static int mixer_class_event(snd_mixer_class_t *class, unsigned int mask,
snd_hctl_elem_t *helem, snd_mixer_elem_t *melem)
{
int err;
const char *name = snd_hctl_elem_get_name(helem);
if (mask & SND_CTL_EVENT_MASK_ADD) {
snd_ctl_elem_iface_t iface = snd_hctl_elem_get_interface(helem);
if (iface == SND_CTL_ELEM_IFACE_CARD || iface == SND_CTL_ELEM_IFACE_PCM) {
snd_mixer_elem_t *new_melem;
/* Put the hctl pointer as our private data - it will be useful for callbacks */
if ((err = snd_mixer_elem_new(&new_melem, SND_MIXER_ELEM_PULSEAUDIO, 0, helem, NULL)) < 0) {
pa_log_warn("snd_mixer_elem_new failed: %s", pa_alsa_strerror(err));
return 0;
}
if ((err = snd_mixer_elem_attach(new_melem, helem)) < 0) {
pa_log_warn("snd_mixer_elem_attach failed: %s", pa_alsa_strerror(err));
snd_mixer_elem_free(melem);
return 0;
}
if ((err = snd_mixer_elem_add(new_melem, class)) < 0) {
pa_log_warn("snd_mixer_elem_add failed: %s", pa_alsa_strerror(err));
return 0;
}
}
}
else if (mask & SND_CTL_EVENT_MASK_VALUE) {
snd_mixer_elem_value(melem); /* Calls the element callback */
return 0;
}
else
pa_log_info("Got an unknown mixer class event for %s: mask 0x%x", name, mask);
return 0;
}
static int prepare_mixer(snd_mixer_t *mixer, const char *dev) {
int err;
snd_mixer_class_t *class;
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, pa_alsa_strerror(err));
return -1;
}
if (snd_mixer_class_malloc(&class)) {
pa_log_info("Failed to allocate mixer class for %s", dev);
return -1;
}
snd_mixer_class_set_event(class, mixer_class_event);
snd_mixer_class_set_compare(class, mixer_class_compare);
if ((err = snd_mixer_class_register(class, mixer)) < 0) {
pa_log_info("Unable register mixer class for %s: %s", dev, pa_alsa_strerror(err));
snd_mixer_class_free(class);
return -1;
}
/* From here on, the mixer class is deallocated by alsa on snd_mixer_close/free. */
if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
pa_log_warn("Unable to register mixer: %s", pa_alsa_strerror(err));
return -1;
}
if ((err = snd_mixer_load(mixer)) < 0) {
pa_log_warn("Unable to load mixer: %s", pa_alsa_strerror(err));
return -1;
}
pa_log_info("Successfully attached to mixer '%s'", dev);
return 0;
}
snd_mixer_t *pa_alsa_open_mixer(pa_hashmap *mixers, int alsa_card_index, bool probe) {
char *md = pa_sprintf_malloc("hw:%i", alsa_card_index);
snd_mixer_t *m = pa_alsa_open_mixer_by_name(mixers, md, probe);
pa_xfree(md);
return m;
}
snd_mixer_t *pa_alsa_open_mixer_by_name(pa_hashmap *mixers, const char *dev, bool probe) {
int err;
snd_mixer_t *m;
pa_alsa_mixer *pm;
char *dev2;
void *state;
pa_assert(mixers);
pa_assert(dev);
pm = pa_hashmap_get(mixers, dev);
/* The quick card number/index lookup (hw:#)
* We already know the card number/index, thus use the mixer
* from the cache at first.
*/
if (!pm && pa_strneq(dev, "hw:", 3)) {
const char *s = dev + 3;
int card_index;
while (*s && *s >= '0' && *s <= '9') s++;
if (*s == '\0' && pa_atoi(dev + 3, &card_index) >= 0) {
PA_HASHMAP_FOREACH_KV(dev2, pm, mixers, state) {
if (pm->card_index == card_index) {
dev = dev2;
pm = pa_hashmap_get(mixers, dev);
break;
}
}
}
}
if (pm) {
if (!probe)
pm->used_for_probe_only = false;
return pm->mixer_handle;
}
if ((err = snd_mixer_open(&m, 0)) < 0) {
pa_log("Error opening mixer: %s", pa_alsa_strerror(err));
return NULL;
}
if (prepare_mixer(m, dev) >= 0) {
pm = pa_xnew0(pa_alsa_mixer, 1);
if (pm) {
snd_hctl_t *hctl;
pm->card_index = -1;
/* determine the ALSA card number (index) and store it to card_index */
err = snd_mixer_get_hctl(m, dev, &hctl);
if (err >= 0) {
snd_ctl_card_info_t *info;
snd_ctl_card_info_alloca(&info);
err = snd_ctl_card_info(snd_hctl_ctl(hctl), info);
if (err >= 0)
pm->card_index = snd_ctl_card_info_get_card(info);
}
pm->used_for_probe_only = probe;
pm->mixer_handle = m;
pa_hashmap_put(mixers, pa_xstrdup(dev), pm);
return m;
}
}
snd_mixer_close(m);
return NULL;
}
snd_mixer_t *pa_alsa_open_mixer_for_pcm(pa_hashmap *mixers, snd_pcm_t *pcm, bool probe) {
snd_pcm_info_t* info;
snd_pcm_info_alloca(&info);
pa_assert(pcm);
if (snd_pcm_info(pcm, info) >= 0) {
int card_idx;
if ((card_idx = snd_pcm_info_get_card(info)) >= 0)
return pa_alsa_open_mixer(mixers, card_idx, probe);
}
return NULL;
}
#if 0
void pa_alsa_mixer_set_fdlist(pa_hashmap *mixers, snd_mixer_t *mixer_handle, pa_mainloop_api *ml)
{
pa_alsa_mixer *pm;
void *state;
PA_HASHMAP_FOREACH(pm, mixers, state)
if (pm->mixer_handle == mixer_handle) {
pm->used_for_probe_only = false;
if (!pm->fdl) {
pm->fdl = pa_alsa_fdlist_new();
if (pm->fdl)
pa_alsa_fdlist_set_handle(pm->fdl, pm->mixer_handle, NULL, ml);
}
}
}
#endif
void pa_alsa_mixer_free(pa_alsa_mixer *mixer)
{
if (mixer->mixer_handle)
snd_mixer_close(mixer->mixer_handle);
pa_xfree(mixer);
}
int pa_alsa_get_hdmi_eld(snd_hctl_elem_t *elem, pa_hdmi_eld *eld) {
/* The ELD format is specific to HDA Intel sound cards and defined in the
HDA specification: http://www.intel.com/content/www/us/en/standards/high-definition-audio-specification.html */
int err;
snd_ctl_elem_info_t *info;
snd_ctl_elem_value_t *value;
uint8_t *elddata;
unsigned int eldsize, mnl;
unsigned int device;
pa_assert(eld != NULL);
pa_assert(elem != NULL);
/* Does it have any contents? */
snd_ctl_elem_info_alloca(&info);
snd_ctl_elem_value_alloca(&value);
if ((err = snd_hctl_elem_info(elem, info)) < 0 ||
(err = snd_hctl_elem_read(elem, value)) < 0) {
pa_log_warn("Accessing ELD control failed with error %s", snd_strerror(err));
return -1;
}
device = snd_hctl_elem_get_device(elem);
eldsize = snd_ctl_elem_info_get_count(info);
elddata = (unsigned char *) snd_ctl_elem_value_get_bytes(value);
if (elddata == NULL || eldsize == 0) {
pa_log_debug("ELD info empty (for device=%d)", device);
return -1;
}
if (eldsize < 20 || eldsize > 256) {
pa_log_debug("ELD info has wrong size (for device=%d)", device);
return -1;
}
/* Try to fetch monitor name */
mnl = elddata[4] & 0x1f;
if (mnl == 0 || mnl > 16 || 20 + mnl > eldsize) {
pa_log_debug("No monitor name in ELD info (for device=%d)", device);
mnl = 0;
}
memcpy(eld->monitor_name, &elddata[20], mnl);
eld->monitor_name[mnl] = '\0';
if (mnl)
pa_log_debug("Monitor name in ELD info is '%s' (for device=%d)", eld->monitor_name, device);
return 0;
}
Reference in a new issue View git blame Copy permalink