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pulseaudio/src/modules/alsa/alsa-util.c
Lennart Poettering e6f4586f7b include ALSA driver in properties for cards/sink
2009-01-30 02:24:58 +01:00

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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <limits.h>
#include <asoundlib.h>
#include <pulse/sample.h>
#include <pulse/xmalloc.h>
#include <pulse/timeval.h>
#include <pulse/util.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include <pulsecore/core-util.h>
#include <pulsecore/atomic.h>
#include "alsa-util.h"
#ifdef HAVE_HAL
#include "hal-util.h"
#endif
struct pa_alsa_fdlist {
unsigned num_fds;
struct pollfd *fds;
/* This is a temporary buffer used to avoid lots of mallocs */
struct pollfd *work_fds;
snd_mixer_t *mixer;
pa_mainloop_api *m;
pa_defer_event *defer;
pa_io_event **ios;
pa_bool_t polled;
void (*cb)(void *userdata);
void *userdata;
};
static void io_cb(pa_mainloop_api*a, pa_io_event* e, int fd, pa_io_event_flags_t events, void *userdata) {
struct pa_alsa_fdlist *fdl = userdata;
int err;
unsigned i;
unsigned short revents;
pa_assert(a);
pa_assert(fdl);
pa_assert(fdl->mixer);
pa_assert(fdl->fds);
pa_assert(fdl->work_fds);
if (fdl->polled)
return;
fdl->polled = TRUE;
memcpy(fdl->work_fds, fdl->fds, sizeof(struct pollfd) * fdl->num_fds);
for (i = 0; i < fdl->num_fds; i++) {
if (e == fdl->ios[i]) {
if (events & PA_IO_EVENT_INPUT)
fdl->work_fds[i].revents |= POLLIN;
if (events & PA_IO_EVENT_OUTPUT)
fdl->work_fds[i].revents |= POLLOUT;
if (events & PA_IO_EVENT_ERROR)
fdl->work_fds[i].revents |= POLLERR;
if (events & PA_IO_EVENT_HANGUP)
fdl->work_fds[i].revents |= POLLHUP;
break;
}
}
pa_assert(i != fdl->num_fds);
if ((err = snd_mixer_poll_descriptors_revents(fdl->mixer, fdl->work_fds, fdl->num_fds, &revents)) < 0) {
pa_log_error("Unable to get poll revent: %s", snd_strerror(err));
return;
}
a->defer_enable(fdl->defer, 1);
if (revents)
snd_mixer_handle_events(fdl->mixer);
}
static void defer_cb(pa_mainloop_api*a, pa_defer_event* e, void *userdata) {
struct pa_alsa_fdlist *fdl = userdata;
unsigned num_fds, i;
int err;
struct pollfd *temp;
pa_assert(a);
pa_assert(fdl);
pa_assert(fdl->mixer);
a->defer_enable(fdl->defer, 0);
num_fds = (unsigned) snd_mixer_poll_descriptors_count(fdl->mixer);
if (num_fds != fdl->num_fds) {
if (fdl->fds)
pa_xfree(fdl->fds);
if (fdl->work_fds)
pa_xfree(fdl->work_fds);
fdl->fds = pa_xnew0(struct pollfd, num_fds);
fdl->work_fds = pa_xnew(struct pollfd, num_fds);
}
memset(fdl->work_fds, 0, sizeof(struct pollfd) * num_fds);
if ((err = snd_mixer_poll_descriptors(fdl->mixer, fdl->work_fds, num_fds)) < 0) {
pa_log_error("Unable to get poll descriptors: %s", snd_strerror(err));
return;
}
fdl->polled = FALSE;
if (memcmp(fdl->fds, fdl->work_fds, sizeof(struct pollfd) * num_fds) == 0)
return;
if (fdl->ios) {
for (i = 0; i < fdl->num_fds; i++)
a->io_free(fdl->ios[i]);
if (num_fds != fdl->num_fds) {
pa_xfree(fdl->ios);
fdl->ios = NULL;
}
}
if (!fdl->ios)
fdl->ios = pa_xnew(pa_io_event*, num_fds);
/* Swap pointers */
temp = fdl->work_fds;
fdl->work_fds = fdl->fds;
fdl->fds = temp;
fdl->num_fds = num_fds;
for (i = 0;i < num_fds;i++)
fdl->ios[i] = a->io_new(a, fdl->fds[i].fd,
((fdl->fds[i].events & POLLIN) ? PA_IO_EVENT_INPUT : 0) |
((fdl->fds[i].events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0),
io_cb, fdl);
}
struct pa_alsa_fdlist *pa_alsa_fdlist_new(void) {
struct pa_alsa_fdlist *fdl;
fdl = pa_xnew0(struct pa_alsa_fdlist, 1);
fdl->num_fds = 0;
fdl->fds = NULL;
fdl->work_fds = NULL;
fdl->mixer = NULL;
fdl->m = NULL;
fdl->defer = NULL;
fdl->ios = NULL;
fdl->polled = FALSE;
return fdl;
}
void pa_alsa_fdlist_free(struct pa_alsa_fdlist *fdl) {
pa_assert(fdl);
if (fdl->defer) {
pa_assert(fdl->m);
fdl->m->defer_free(fdl->defer);
}
if (fdl->ios) {
unsigned i;
pa_assert(fdl->m);
for (i = 0; i < fdl->num_fds; i++)
fdl->m->io_free(fdl->ios[i]);
pa_xfree(fdl->ios);
}
if (fdl->fds)
pa_xfree(fdl->fds);
if (fdl->work_fds)
pa_xfree(fdl->work_fds);
pa_xfree(fdl);
}
int pa_alsa_fdlist_set_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_handle, pa_mainloop_api* m) {
pa_assert(fdl);
pa_assert(mixer_handle);
pa_assert(m);
pa_assert(!fdl->m);
fdl->mixer = mixer_handle;
fdl->m = m;
fdl->defer = m->defer_new(m, defer_cb, fdl);
return 0;
}
static int set_format(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, pa_sample_format_t *f) {
static const snd_pcm_format_t format_trans[] = {
[PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
[PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
[PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
[PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
[PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
[PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
[PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
[PA_SAMPLE_S32LE] = SND_PCM_FORMAT_S32_LE,
[PA_SAMPLE_S32BE] = SND_PCM_FORMAT_S32_BE,
[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,
PA_SAMPLE_INVALID
};
int i, ret;
pa_assert(pcm_handle);
pa_assert(f);
if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
return ret;
if (*f == PA_SAMPLE_FLOAT32BE)
*f = PA_SAMPLE_FLOAT32LE;
else if (*f == PA_SAMPLE_FLOAT32LE)
*f = PA_SAMPLE_FLOAT32BE;
else if (*f == PA_SAMPLE_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;
try_auto:
for (i = 0; try_order[i] != PA_SAMPLE_INVALID; i++) {
*f = try_order[i];
if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
return ret;
}
return -1;
}
/* Set the hardware parameters of the given ALSA device. Returns the
* selected fragment settings in *period and *period_size */
int pa_alsa_set_hw_params(
snd_pcm_t *pcm_handle,
pa_sample_spec *ss,
uint32_t *periods,
snd_pcm_uframes_t *period_size,
snd_pcm_uframes_t tsched_size,
pa_bool_t *use_mmap,
pa_bool_t *use_tsched,
pa_bool_t require_exact_channel_number) {
int ret = -1;
snd_pcm_uframes_t _period_size = period_size ? *period_size : 0;
unsigned int _periods = periods ? *periods : 0;
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);
snd_pcm_hw_params_alloca(&hwparams);
if ((ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0)
goto finish;
if ((ret = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 0)) < 0)
goto finish;
if (_use_mmap) {
if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0) {
/* mmap() didn't work, fall back to interleaved */
if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
goto finish;
_use_mmap = FALSE;
}
} else if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
goto finish;
if (!_use_mmap)
_use_tsched = FALSE;
if ((ret = set_format(pcm_handle, hwparams, &f)) < 0)
goto finish;
if ((ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &r, NULL)) < 0)
goto finish;
if (require_exact_channel_number) {
if ((ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, c)) < 0)
goto finish;
} else {
if ((ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0)
goto finish;
}
if ((ret = snd_pcm_hw_params_set_periods_integer(pcm_handle, hwparams)) < 0)
goto finish;
if (_period_size && tsched_size && _periods) {
/* 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 (_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 (_periods > 0) {
/* First we pass 0 as direction to get exactly what we asked
* for. That this is necessary is presumably a bug in ALSA */
dir = 0;
if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) {
dir = 1;
if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) {
dir = -1;
if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0)
goto finish;
}
}
}
if (_period_size > 0)
if ((ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0)
goto finish;
}
if ((ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0)
goto finish;
if (ss->rate != r)
pa_log_info("Device %s doesn't support %u Hz, changed to %u Hz.", snd_pcm_name(pcm_handle), ss->rate, r);
if (ss->channels != c)
pa_log_info("Device %s doesn't support %u channels, changed to %u.", snd_pcm_name(pcm_handle), ss->channels, c);
if (ss->format != f)
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(f));
if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
goto finish;
if ((ret = snd_pcm_hw_params_get_period_size(hwparams, &_period_size, &dir)) < 0 ||
(ret = snd_pcm_hw_params_get_periods(hwparams, &_periods, &dir)) < 0)
goto finish;
/* If the sample rate deviates too much, we need to resample */
if (r < ss->rate*.95 || r > ss->rate*1.05)
ss->rate = r;
ss->channels = (uint8_t) c;
ss->format = f;
pa_assert(_periods > 0);
pa_assert(_period_size > 0);
if (periods)
*periods = _periods;
if (period_size)
*period_size = _period_size;
if (use_mmap)
*use_mmap = _use_mmap;
if (use_tsched)
*use_tsched = _use_tsched;
ret = 0;
snd_pcm_nonblock(pcm_handle, 1);
finish:
return ret;
}
int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min) {
snd_pcm_sw_params_t *swparams;
int err;
pa_assert(pcm);
snd_pcm_sw_params_alloca(&swparams);
if ((err = snd_pcm_sw_params_current(pcm, swparams) < 0)) {
pa_log_warn("Unable to determine current swparams: %s\n", snd_strerror(err));
return err;
}
if ((err = snd_pcm_sw_params_set_stop_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
pa_log_warn("Unable to set stop threshold: %s\n", snd_strerror(err));
return err;
}
if ((err = snd_pcm_sw_params_set_start_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
pa_log_warn("Unable to set start threshold: %s\n", snd_strerror(err));
return err;
}
if ((err = snd_pcm_sw_params_set_avail_min(pcm, swparams, avail_min)) < 0) {
pa_log_error("snd_pcm_sw_params_set_avail_min() failed: %s", snd_strerror(err));
return err;
}
if ((err = snd_pcm_sw_params(pcm, swparams)) < 0) {
pa_log_warn("Unable to set sw params: %s\n", snd_strerror(err));
return err;
}
return 0;
}
static const struct pa_alsa_profile_info device_table[] = {
{{ 1, { PA_CHANNEL_POSITION_MONO }},
"hw",
"Analog Mono",
"analog-mono",
1 },
{{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT }},
"front",
"Analog Stereo",
"analog-stereo",
10 },
{{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT }},
"iec958",
"IEC958 Digital Stereo",
"iec958-stereo",
5 },
{{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT }},
"hdmi",
"HDMI Digital Stereo",
"hdmi-stereo",
4 },
{{ 4, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT }},
"surround40",
"Analog Surround 4.0",
"analog-surround-40",
7 },
{{ 4, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT }},
"a52",
"IEC958/AC3 Digital Surround 4.0",
"iec958-ac3-surround-40",
2 },
{{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
PA_CHANNEL_POSITION_LFE }},
"surround41",
"Analog Surround 4.1",
"analog-surround-41",
7 },
{{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
PA_CHANNEL_POSITION_CENTER }},
"surround50",
"Analog Surround 5.0",
"analog-surround-50",
7 },
{{ 6, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE }},
"surround51",
"Analog Surround 5.1",
"analog-surround-51",
8 },
{{ 6, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_CENTER,
PA_CHANNEL_POSITION_FRONT_RIGHT, PA_CHANNEL_POSITION_REAR_LEFT,
PA_CHANNEL_POSITION_REAR_RIGHT, PA_CHANNEL_POSITION_LFE}},
"a52",
"IEC958/AC3 Digital Surround 5.1",
"iec958-ac3-surround-51",
3 },
{{ 8, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE,
PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT }},
"surround71",
"Analog Surround 7.1",
"analog-surround-71",
7 },
{{ 0, { 0 }}, NULL, NULL, NULL, 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,
uint32_t *nfrags,
snd_pcm_uframes_t *period_size,
snd_pcm_uframes_t tsched_size,
pa_bool_t *use_mmap,
pa_bool_t *use_tsched,
const pa_alsa_profile_info **profile) {
int i;
int direction = 1;
char *d;
snd_pcm_t *pcm_handle;
pa_assert(dev_id);
pa_assert(dev);
pa_assert(ss);
pa_assert(map);
pa_assert(nfrags);
pa_assert(period_size);
/* First we try to find a device string with a superset of the
* requested channel map and open it without the plug: prefix. We
* iterate through our device table from top to bottom and take
* the first that matches. If we didn't find a working device that
* way, we iterate backwards, and check all devices that do not
* provide a superset of the requested channel map.*/
i = 0;
for (;;) {
if ((direction > 0) == pa_channel_map_superset(&device_table[i].map, map)) {
pa_sample_spec try_ss;
pa_log_debug("Checking for %s (%s)", device_table[i].name, device_table[i].alsa_name);
d = pa_sprintf_malloc("%s:%s", device_table[i].alsa_name, dev_id);
try_ss.channels = device_table[i].map.channels;
try_ss.rate = ss->rate;
try_ss.format = ss->format;
pcm_handle = pa_alsa_open_by_device_string(
d,
dev,
&try_ss,
map,
mode,
nfrags,
period_size,
tsched_size,
use_mmap,
use_tsched,
TRUE);
pa_xfree(d);
if (pcm_handle) {
*ss = try_ss;
*map = device_table[i].map;
pa_assert(map->channels == ss->channels);
if (profile)
*profile = &device_table[i];
return pcm_handle;
}
}
if (direction > 0) {
if (!device_table[i+1].alsa_name) {
/* OK, so we are at the end of our list. Let's turn
* back. */
direction = -1;
} else {
/* We are not at the end of the list, so let's simply
* try the next entry */
i++;
}
}
if (direction < 0) {
if (device_table[i+1].alsa_name &&
device_table[i].map.channels == device_table[i+1].map.channels) {
/* OK, the next entry has the same number of channels,
* let's try it */
i++;
} else {
/* Hmm, so the next entry does not have the same
* number of channels, so let's go backwards until we
* find the next entry with a differnt number of
* channels */
for (i--; i >= 0; i--)
if (device_table[i].map.channels != device_table[i+1].map.channels)
break;
/* Hmm, there is no entry with a different number of
* entries, then we're done */
if (i < 0)
break;
/* OK, now lets find go back as long as we have the same number of channels */
for (; i > 0; i--)
if (device_table[i].map.channels != device_table[i-1].map.channels)
break;
}
}
}
/* OK, we didn't find any good device, so let's try the raw plughw: stuff */
d = pa_sprintf_malloc("hw:%s", dev_id);
pa_log_debug("Trying %s as last resort...", d);
pcm_handle = pa_alsa_open_by_device_string(d, dev, ss, map, mode, nfrags, period_size, tsched_size, use_mmap, use_tsched, FALSE);
pa_xfree(d);
if (pcm_handle && profile)
*profile = NULL;
return pcm_handle;
}
snd_pcm_t *pa_alsa_open_by_device_id_profile(
const char *dev_id,
char **dev,
pa_sample_spec *ss,
pa_channel_map* map,
int mode,
uint32_t *nfrags,
snd_pcm_uframes_t *period_size,
snd_pcm_uframes_t tsched_size,
pa_bool_t *use_mmap,
pa_bool_t *use_tsched,
const pa_alsa_profile_info *profile) {
char *d;
snd_pcm_t *pcm_handle;
pa_sample_spec try_ss;
pa_assert(dev_id);
pa_assert(dev);
pa_assert(ss);
pa_assert(map);
pa_assert(nfrags);
pa_assert(period_size);
pa_assert(profile);
d = pa_sprintf_malloc("%s:%s", profile->alsa_name, dev_id);
try_ss.channels = profile->map.channels;
try_ss.rate = ss->rate;
try_ss.format = ss->format;
pcm_handle = pa_alsa_open_by_device_string(
d,
dev,
&try_ss,
map,
mode,
nfrags,
period_size,
tsched_size,
use_mmap,
use_tsched,
TRUE);
pa_xfree(d);
if (!pcm_handle)
return NULL;
*ss = try_ss;
*map = profile->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,
uint32_t *nfrags,
snd_pcm_uframes_t *period_size,
snd_pcm_uframes_t tsched_size,
pa_bool_t *use_mmap,
pa_bool_t *use_tsched,
pa_bool_t require_exact_channel_number) {
int err;
char *d;
snd_pcm_t *pcm_handle;
pa_bool_t 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");
/* We don't pass SND_PCM_NONBLOCK here, since alsa-lib <=
* 1.0.17a would then ignore the SND_PCM_NO_xxx flags. Instead
* we enable nonblock mode afterwards via
* snd_pcm_nonblock(). Also see
* http://mailman.alsa-project.org/pipermail/alsa-devel/2008-August/010258.html */
if ((err = snd_pcm_open(&pcm_handle, d, mode,
/*SND_PCM_NONBLOCK|*/
SND_PCM_NO_AUTO_RESAMPLE|
SND_PCM_NO_AUTO_CHANNELS|
(reformat ? 0 : SND_PCM_NO_AUTO_FORMAT))) < 0) {
pa_log_info("Error opening PCM device %s: %s", d, snd_strerror(err));
pa_xfree(d);
return NULL;
}
if ((err = pa_alsa_set_hw_params(pcm_handle, ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, 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:%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, snd_strerror(err));
pa_xfree(d);
snd_pcm_close(pcm_handle);
return NULL;
}
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;
}
}
int pa_alsa_probe_profiles(
const char *dev_id,
const pa_sample_spec *ss,
void (*cb)(const pa_alsa_profile_info *sink, const pa_alsa_profile_info *source, void *userdata),
void *userdata) {
const pa_alsa_profile_info *i;
pa_assert(dev_id);
pa_assert(ss);
pa_assert(cb);
/* We try each combination of playback/capture. We also try to
* open only for capture resp. only for sink. Don't get confused
* by the trailing entry in device_table we use for this! */
for (i = device_table; i < device_table + PA_ELEMENTSOF(device_table); i++) {
const pa_alsa_profile_info *j;
snd_pcm_t *pcm_i = NULL;
if (i->alsa_name) {
char *id;
pa_sample_spec try_ss;
pa_channel_map try_map;
pa_log_debug("Checking for playback on %s (%s)", i->name, i->alsa_name);
id = pa_sprintf_malloc("%s:%s", i->alsa_name, dev_id);
try_ss = *ss;
try_ss.channels = i->map.channels;
try_map = i->map;
pcm_i = pa_alsa_open_by_device_string(
id, NULL,
&try_ss, &try_map,
SND_PCM_STREAM_PLAYBACK,
NULL, NULL, 0, NULL, NULL,
TRUE);
pa_xfree(id);
if (!pcm_i)
continue;
}
for (j = device_table; j < device_table + PA_ELEMENTSOF(device_table); j++) {
snd_pcm_t *pcm_j = NULL;
if (j->alsa_name) {
char *jd;
pa_sample_spec try_ss;
pa_channel_map try_map;
pa_log_debug("Checking for capture on %s (%s)", j->name, j->alsa_name);
jd = pa_sprintf_malloc("%s:%s", j->alsa_name, dev_id);
try_ss = *ss;
try_ss.channels = j->map.channels;
try_map = j->map;
pcm_j = pa_alsa_open_by_device_string(
jd, NULL,
&try_ss, &try_map,
SND_PCM_STREAM_CAPTURE,
NULL, NULL, 0, NULL, NULL,
TRUE);
pa_xfree(jd);
if (!pcm_j)
continue;
}
if (pcm_j)
snd_pcm_close(pcm_j);
if (i->alsa_name || j->alsa_name)
cb(i->alsa_name ? i : NULL,
j->alsa_name ? j : NULL, userdata);
}
if (pcm_i)
snd_pcm_close(pcm_i);
}
return TRUE;
}
int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) {
int err;
pa_assert(mixer);
pa_assert(dev);
if ((err = snd_mixer_attach(mixer, dev)) < 0) {
pa_log_info("Unable to attach to mixer %s: %s", dev, snd_strerror(err));
return -1;
}
if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
pa_log_warn("Unable to register mixer: %s", snd_strerror(err));
return -1;
}
if ((err = snd_mixer_load(mixer)) < 0) {
pa_log_warn("Unable to load mixer: %s", snd_strerror(err));
return -1;
}
pa_log_info("Successfully attached to mixer '%s'", dev);
return 0;
}
static pa_bool_t elem_has_volume(snd_mixer_elem_t *elem, pa_bool_t playback) {
pa_assert(elem);
if (playback && snd_mixer_selem_has_playback_volume(elem))
return TRUE;
if (!playback && snd_mixer_selem_has_capture_volume(elem))
return TRUE;
return FALSE;
}
static pa_bool_t elem_has_switch(snd_mixer_elem_t *elem, pa_bool_t playback) {
pa_assert(elem);
if (playback && snd_mixer_selem_has_playback_switch(elem))
return TRUE;
if (!playback && snd_mixer_selem_has_capture_switch(elem))
return TRUE;
return FALSE;
}
snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback, pa_bool_t playback) {
snd_mixer_elem_t *elem = NULL, *fallback_elem = NULL;
snd_mixer_selem_id_t *sid = NULL;
snd_mixer_selem_id_alloca(&sid);
pa_assert(mixer);
pa_assert(name);
snd_mixer_selem_id_set_name(sid, name);
if ((elem = snd_mixer_find_selem(mixer, sid))) {
if (elem_has_volume(elem, playback) &&
elem_has_switch(elem, playback))
goto success;
if (!elem_has_volume(elem, playback) &&
!elem_has_switch(elem, playback))
elem = NULL;
}
pa_log_info("Cannot find mixer control \"%s\" or mixer control is no combination of switch/volume.", snd_mixer_selem_id_get_name(sid));
if (fallback) {
snd_mixer_selem_id_set_name(sid, fallback);
if ((fallback_elem = snd_mixer_find_selem(mixer, sid))) {
if (elem_has_volume(fallback_elem, playback) &&
elem_has_switch(fallback_elem, playback)) {
elem = fallback_elem;
goto success;
}
if (!elem_has_volume(fallback_elem, playback) &&
!elem_has_switch(fallback_elem, playback))
fallback_elem = NULL;
}
pa_log_warn("Cannot find fallback mixer control \"%s\" or mixer control is no combination of switch/volume.", snd_mixer_selem_id_get_name(sid));
}
if (elem && fallback_elem) {
/* Hmm, so we have both elements, but neither has both mute
* and volume. Let's prefer the one with the volume */
if (elem_has_volume(elem, playback))
goto success;
if (elem_has_volume(fallback_elem, playback)) {
elem = fallback_elem;
goto success;
}
}
if (!elem && fallback_elem)
elem = fallback_elem;
success:
if (elem)
pa_log_info("Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
return elem;
}
static const snd_mixer_selem_channel_id_t alsa_channel_ids[PA_CHANNEL_POSITION_MAX] = {
[PA_CHANNEL_POSITION_MONO] = SND_MIXER_SCHN_MONO, /* The ALSA name is just an alias! */
[PA_CHANNEL_POSITION_FRONT_CENTER] = SND_MIXER_SCHN_FRONT_CENTER,
[PA_CHANNEL_POSITION_FRONT_LEFT] = SND_MIXER_SCHN_FRONT_LEFT,
[PA_CHANNEL_POSITION_FRONT_RIGHT] = SND_MIXER_SCHN_FRONT_RIGHT,
[PA_CHANNEL_POSITION_REAR_CENTER] = SND_MIXER_SCHN_REAR_CENTER,
[PA_CHANNEL_POSITION_REAR_LEFT] = SND_MIXER_SCHN_REAR_LEFT,
[PA_CHANNEL_POSITION_REAR_RIGHT] = SND_MIXER_SCHN_REAR_RIGHT,
[PA_CHANNEL_POSITION_LFE] = SND_MIXER_SCHN_WOOFER,
[PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_SIDE_LEFT] = SND_MIXER_SCHN_SIDE_LEFT,
[PA_CHANNEL_POSITION_SIDE_RIGHT] = SND_MIXER_SCHN_SIDE_RIGHT,
[PA_CHANNEL_POSITION_AUX0] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX1] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX2] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX3] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX4] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX5] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX6] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX7] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX8] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX9] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX10] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX11] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX12] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX13] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX14] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX15] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX16] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX17] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX18] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX19] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX20] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX21] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX22] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX23] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX24] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX25] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX26] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX27] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX28] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX29] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX30] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_AUX31] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_TOP_CENTER] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_TOP_REAR_CENTER] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_TOP_REAR_LEFT] = SND_MIXER_SCHN_UNKNOWN,
[PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = SND_MIXER_SCHN_UNKNOWN
};
int pa_alsa_calc_mixer_map(snd_mixer_elem_t *elem, const pa_channel_map *channel_map, snd_mixer_selem_channel_id_t mixer_map[], pa_bool_t playback) {
unsigned i;
pa_bool_t alsa_channel_used[SND_MIXER_SCHN_LAST];
pa_bool_t mono_used = FALSE;
pa_assert(elem);
pa_assert(channel_map);
pa_assert(mixer_map);
memset(&alsa_channel_used, 0, sizeof(alsa_channel_used));
if (channel_map->channels > 1 &&
((playback && snd_mixer_selem_has_playback_volume_joined(elem)) ||
(!playback && snd_mixer_selem_has_capture_volume_joined(elem)))) {
pa_log_info("ALSA device lacks independant volume controls for each channel.");
return -1;
}
for (i = 0; i < channel_map->channels; i++) {
snd_mixer_selem_channel_id_t id;
pa_bool_t is_mono;
is_mono = channel_map->map[i] == PA_CHANNEL_POSITION_MONO;
id = alsa_channel_ids[channel_map->map[i]];
if (!is_mono && id == SND_MIXER_SCHN_UNKNOWN) {
pa_log_info("Configured channel map contains channel '%s' that is unknown to the ALSA mixer.", pa_channel_position_to_string(channel_map->map[i]));
return -1;
}
if ((is_mono && mono_used) || (!is_mono && alsa_channel_used[id])) {
pa_log_info("Channel map has duplicate channel '%s', falling back to software volume control.", pa_channel_position_to_string(channel_map->map[i]));
return -1;
}
if ((playback && (!snd_mixer_selem_has_playback_channel(elem, id) || (is_mono && !snd_mixer_selem_is_playback_mono(elem)))) ||
(!playback && (!snd_mixer_selem_has_capture_channel(elem, id) || (is_mono && !snd_mixer_selem_is_capture_mono(elem))))) {
pa_log_info("ALSA device lacks separate volumes control for channel '%s'", pa_channel_position_to_string(channel_map->map[i]));
return -1;
}
if (is_mono) {
mixer_map[i] = SND_MIXER_SCHN_MONO;
mono_used = TRUE;
} else {
mixer_map[i] = id;
alsa_channel_used[id] = TRUE;
}
}
pa_log_info("All %u channels can be mapped to mixer channels.", channel_map->channels);
return 0;
}
void pa_alsa_dump(snd_pcm_t *pcm) {
int err;
snd_output_t *out;
pa_assert(pcm);
pa_assert_se(snd_output_buffer_open(&out) == 0);
if ((err = snd_pcm_dump(pcm, out)) < 0)
pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
else {
char *s = NULL;
snd_output_buffer_string(out, &s);
pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
}
pa_assert_se(snd_output_close(out) == 0);
}
void pa_alsa_dump_status(snd_pcm_t *pcm) {
int err;
snd_output_t *out;
snd_pcm_status_t *status;
pa_assert(pcm);
snd_pcm_status_alloca(&status);
pa_assert_se(snd_output_buffer_open(&out) == 0);
pa_assert_se(snd_pcm_status(pcm, status) == 0);
if ((err = snd_pcm_status_dump(status, out)) < 0)
pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
else {
char *s = NULL;
snd_output_buffer_string(out, &s);
pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
}
pa_assert_se(snd_output_close(out) == 0);
}
static void alsa_error_handler(const char *file, int line, const char *function, int err, const char *fmt,...) {
va_list ap;
char *alsa_file;
alsa_file = pa_sprintf_malloc("(alsa-lib)%s", file);
va_start(ap, fmt);
pa_log_levelv_meta(PA_LOG_INFO, alsa_file, line, function, fmt, ap);
va_end(ap);
pa_xfree(alsa_file);
}
static pa_atomic_t n_error_handler_installed = PA_ATOMIC_INIT(0);
void pa_alsa_redirect_errors_inc(void) {
/* This is not really thread safe, but we do our best */
if (pa_atomic_inc(&n_error_handler_installed) == 0)
snd_lib_error_set_handler(alsa_error_handler);
}
void pa_alsa_redirect_errors_dec(void) {
int r;
pa_assert_se((r = pa_atomic_dec(&n_error_handler_installed)) >= 1);
if (r == 1)
snd_lib_error_set_handler(NULL);
}
void pa_alsa_init_proplist_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", cn);
free(cn);
}
if (snd_card_get_longname(card, &lcn) >= 0) {
pa_proplist_sets(p, "alsa.long_card_name", lcn);
free(lcn);
}
if ((dn = pa_alsa_get_driver_name(card))) {
pa_proplist_sets(p, "alsa.driver_name", dn);
pa_xfree(dn);
}
#ifdef HAVE_HAL
pa_hal_get_info(c, p, card);
#endif
}
void pa_alsa_init_proplist_pcm(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, *cn;
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_alsa_init_proplist_card(c, p, card);
cn = pa_proplist_gets(p, "alsa.card_name");
}
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);
}
int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) {
snd_pcm_state_t state;
int err;
pa_assert(pcm);
if (revents & POLLERR)
pa_log_debug("Got POLLERR from ALSA");
if (revents & POLLNVAL)
pa_log_warn("Got POLLNVAL from ALSA");
if (revents & POLLHUP)
pa_log_warn("Got POLLHUP from ALSA");
if (revents & POLLPRI)
pa_log_warn("Got POLLPRI from ALSA");
if (revents & POLLIN)
pa_log_debug("Got POLLIN from ALSA");
if (revents & POLLOUT)
pa_log_debug("Got POLLOUT from ALSA");
state = snd_pcm_state(pcm);
pa_log_debug("PCM state is %s", snd_pcm_state_name(state));
/* Try to recover from this error */
switch (state) {
case SND_PCM_STATE_XRUN:
if ((err = snd_pcm_recover(pcm, -EPIPE, 1)) != 0) {
pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: %s", snd_strerror(err));
return -1;
}
break;
case SND_PCM_STATE_SUSPENDED:
if ((err = snd_pcm_recover(pcm, -ESTRPIPE, 1)) != 0) {
pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and SUSPENDED: %s", snd_strerror(err));
return -1;
}
break;
default:
snd_pcm_drop(pcm);
if ((err = snd_pcm_prepare(pcm)) < 0) {
pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): %s", snd_strerror(err));
return -1;
}
break;
}
return 0;
}
pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll) {
int n, err;
struct pollfd *pollfd;
pa_rtpoll_item *item;
pa_assert(pcm);
if ((n = snd_pcm_poll_descriptors_count(pcm)) < 0) {
pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(n));
return NULL;
}
item = pa_rtpoll_item_new(rtpoll, PA_RTPOLL_NEVER, (unsigned) n);
pollfd = pa_rtpoll_item_get_pollfd(item, NULL);
if ((err = snd_pcm_poll_descriptors(pcm, pollfd, (unsigned) n)) < 0) {
pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
pa_rtpoll_item_free(item);
return NULL;
}
return item;
}
snd_pcm_sframes_t pa_alsa_safe_avail_update(snd_pcm_t *pcm, size_t hwbuf_size, const pa_sample_spec *ss) {
snd_pcm_sframes_t n;
size_t k;
pa_assert(pcm);
pa_assert(hwbuf_size > 0);
pa_assert(ss);
/* Some ALSA driver expose weird bugs, let's inform the user about
* what is going on */
n = snd_pcm_avail_update(pcm);
if (n <= 0)
return n;
k = (size_t) n * pa_frame_size(ss);
if (k >= hwbuf_size * 3 ||
k >= pa_bytes_per_second(ss)*10)
pa_log("snd_pcm_avail_update() returned a value that is exceptionally large: %lu bytes (%lu ms) "
"Most likely this is an ALSA driver bug. Please report this issue to the PulseAudio developers.",
(unsigned long) k, (unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC));
return n;
}
int pa_alsa_safe_mmap_begin(snd_pcm_t *pcm, const snd_pcm_channel_area_t **areas, snd_pcm_uframes_t *offset, snd_pcm_uframes_t *frames, size_t hwbuf_size, const pa_sample_spec *ss) {
int r;
snd_pcm_uframes_t before;
size_t k;
pa_assert(pcm);
pa_assert(areas);
pa_assert(offset);
pa_assert(frames);
pa_assert(hwbuf_size > 0);
pa_assert(ss);
before = *frames;
r = snd_pcm_mmap_begin(pcm, areas, offset, frames);
if (r < 0)
return r;
k = (size_t) *frames * pa_frame_size(ss);
if (*frames > before ||
k >= hwbuf_size * 3 ||
k >= pa_bytes_per_second(ss)*10)
pa_log("snd_pcm_mmap_begin() returned a value that is exceptionally large: %lu bytes (%lu ms) "
"Most likely this is an ALSA driver bug. Please report this issue to the PulseAudio developers.",
(unsigned long) k, (unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC));
return r;
}
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;
}
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