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libsoundio/src/alsa.c
Andrew Kelley c2836e494b alsa: refactor for readability
2016-01-26 20:18:39 -07:00

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/*
* Copyright (c) 2015 Andrew Kelley
*
* This file is part of libsoundio, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#define _GNU_SOURCE
#include "alsa.h"
#include "soundio_private.h"
#include <sys/inotify.h>
#include <fcntl.h>
#include <unistd.h>
static snd_pcm_stream_t stream_types[] = {SND_PCM_STREAM_PLAYBACK, SND_PCM_STREAM_CAPTURE};
static snd_pcm_access_t prioritized_access_types[] = {
SND_PCM_ACCESS_MMAP_INTERLEAVED,
SND_PCM_ACCESS_MMAP_NONINTERLEAVED,
SND_PCM_ACCESS_MMAP_COMPLEX,
SND_PCM_ACCESS_RW_INTERLEAVED,
SND_PCM_ACCESS_RW_NONINTERLEAVED,
};
SOUNDIO_MAKE_LIST_DEF(struct SoundIoAlsaPendingFile, SoundIoListAlsaPendingFile, SOUNDIO_LIST_STATIC)
static void wakeup_device_poll(struct SoundIoAlsa *sia) {
ssize_t amt = write(sia->notify_pipe_fd[1], "a", 1);
if (amt == -1) {
assert(errno != EBADF);
assert(errno != EIO);
assert(errno != ENOSPC);
assert(errno != EPERM);
assert(errno != EPIPE);
}
}
static void wakeup_outstream_poll(struct SoundIoOutStreamAlsa *osa) {
ssize_t amt = write(osa->poll_exit_pipe_fd[1], "a", 1);
if (amt == -1) {
assert(errno != EBADF);
assert(errno != EIO);
assert(errno != ENOSPC);
assert(errno != EPERM);
assert(errno != EPIPE);
}
}
static void destroy_alsa(struct SoundIoPrivate *si) {
struct SoundIoAlsa *sia = &si->backend_data.alsa;
if (sia->thread) {
SOUNDIO_ATOMIC_FLAG_CLEAR(sia->abort_flag);
wakeup_device_poll(sia);
soundio_os_thread_destroy(sia->thread);
}
SoundIoListAlsaPendingFile_deinit(&sia->pending_files);
if (sia->cond)
soundio_os_cond_destroy(sia->cond);
if (sia->mutex)
soundio_os_mutex_destroy(sia->mutex);
soundio_destroy_devices_info(sia->ready_devices_info);
close(sia->notify_pipe_fd[0]);
close(sia->notify_pipe_fd[1]);
close(sia->notify_fd);
}
static inline snd_pcm_uframes_t ceil_dbl_to_uframes(double x) {
const double truncation = (snd_pcm_uframes_t)x;
return truncation + (truncation < x);
}
static char * str_partition_on_char(char *str, char c) {
if (!str)
return NULL;
while (*str) {
if (*str == c) {
*str = 0;
return str + 1;
}
str += 1;
}
return NULL;
}
static snd_pcm_stream_t aim_to_stream(enum SoundIoDeviceAim aim) {
switch (aim) {
case SoundIoDeviceAimOutput: return SND_PCM_STREAM_PLAYBACK;
case SoundIoDeviceAimInput: return SND_PCM_STREAM_CAPTURE;
}
assert(0); // Invalid aim
return SND_PCM_STREAM_PLAYBACK;
}
static enum SoundIoChannelId from_alsa_chmap_pos(unsigned int pos) {
switch ((enum snd_pcm_chmap_position)pos) {
case SND_CHMAP_UNKNOWN: return SoundIoChannelIdInvalid;
case SND_CHMAP_NA: return SoundIoChannelIdInvalid;
case SND_CHMAP_MONO: return SoundIoChannelIdFrontCenter;
case SND_CHMAP_FL: return SoundIoChannelIdFrontLeft; // front left
case SND_CHMAP_FR: return SoundIoChannelIdFrontRight; // front right
case SND_CHMAP_RL: return SoundIoChannelIdBackLeft; // rear left
case SND_CHMAP_RR: return SoundIoChannelIdBackRight; // rear right
case SND_CHMAP_FC: return SoundIoChannelIdFrontCenter; // front center
case SND_CHMAP_LFE: return SoundIoChannelIdLfe; // LFE
case SND_CHMAP_SL: return SoundIoChannelIdSideLeft; // side left
case SND_CHMAP_SR: return SoundIoChannelIdSideRight; // side right
case SND_CHMAP_RC: return SoundIoChannelIdBackCenter; // rear center
case SND_CHMAP_FLC: return SoundIoChannelIdFrontLeftCenter; // front left center
case SND_CHMAP_FRC: return SoundIoChannelIdFrontRightCenter; // front right center
case SND_CHMAP_RLC: return SoundIoChannelIdBackLeftCenter; // rear left center
case SND_CHMAP_RRC: return SoundIoChannelIdBackRightCenter; // rear right center
case SND_CHMAP_FLW: return SoundIoChannelIdFrontLeftWide; // front left wide
case SND_CHMAP_FRW: return SoundIoChannelIdFrontRightWide; // front right wide
case SND_CHMAP_FLH: return SoundIoChannelIdFrontLeftHigh; // front left high
case SND_CHMAP_FCH: return SoundIoChannelIdFrontCenterHigh; // front center high
case SND_CHMAP_FRH: return SoundIoChannelIdFrontRightHigh; // front right high
case SND_CHMAP_TC: return SoundIoChannelIdTopCenter; // top center
case SND_CHMAP_TFL: return SoundIoChannelIdTopFrontLeft; // top front left
case SND_CHMAP_TFR: return SoundIoChannelIdTopFrontRight; // top front right
case SND_CHMAP_TFC: return SoundIoChannelIdTopFrontCenter; // top front center
case SND_CHMAP_TRL: return SoundIoChannelIdTopBackLeft; // top rear left
case SND_CHMAP_TRR: return SoundIoChannelIdTopBackRight; // top rear right
case SND_CHMAP_TRC: return SoundIoChannelIdTopBackCenter; // top rear center
case SND_CHMAP_TFLC: return SoundIoChannelIdTopFrontLeftCenter; // top front left center
case SND_CHMAP_TFRC: return SoundIoChannelIdTopFrontRightCenter; // top front right center
case SND_CHMAP_TSL: return SoundIoChannelIdTopSideLeft; // top side left
case SND_CHMAP_TSR: return SoundIoChannelIdTopSideRight; // top side right
case SND_CHMAP_LLFE: return SoundIoChannelIdLeftLfe; // left LFE
case SND_CHMAP_RLFE: return SoundIoChannelIdRightLfe; // right LFE
case SND_CHMAP_BC: return SoundIoChannelIdBottomCenter; // bottom center
case SND_CHMAP_BLC: return SoundIoChannelIdBottomLeftCenter; // bottom left center
case SND_CHMAP_BRC: return SoundIoChannelIdBottomRightCenter; // bottom right center
}
return SoundIoChannelIdInvalid;
}
static int to_alsa_chmap_pos(enum SoundIoChannelId channel_id) {
switch (channel_id) {
case SoundIoChannelIdFrontLeft: return SND_CHMAP_FL;
case SoundIoChannelIdFrontRight: return SND_CHMAP_FR;
case SoundIoChannelIdBackLeft: return SND_CHMAP_RL;
case SoundIoChannelIdBackRight: return SND_CHMAP_RR;
case SoundIoChannelIdFrontCenter: return SND_CHMAP_FC;
case SoundIoChannelIdLfe: return SND_CHMAP_LFE;
case SoundIoChannelIdSideLeft: return SND_CHMAP_SL;
case SoundIoChannelIdSideRight: return SND_CHMAP_SR;
case SoundIoChannelIdBackCenter: return SND_CHMAP_RC;
case SoundIoChannelIdFrontLeftCenter: return SND_CHMAP_FLC;
case SoundIoChannelIdFrontRightCenter: return SND_CHMAP_FRC;
case SoundIoChannelIdBackLeftCenter: return SND_CHMAP_RLC;
case SoundIoChannelIdBackRightCenter: return SND_CHMAP_RRC;
case SoundIoChannelIdFrontLeftWide: return SND_CHMAP_FLW;
case SoundIoChannelIdFrontRightWide: return SND_CHMAP_FRW;
case SoundIoChannelIdFrontLeftHigh: return SND_CHMAP_FLH;
case SoundIoChannelIdFrontCenterHigh: return SND_CHMAP_FCH;
case SoundIoChannelIdFrontRightHigh: return SND_CHMAP_FRH;
case SoundIoChannelIdTopCenter: return SND_CHMAP_TC;
case SoundIoChannelIdTopFrontLeft: return SND_CHMAP_TFL;
case SoundIoChannelIdTopFrontRight: return SND_CHMAP_TFR;
case SoundIoChannelIdTopFrontCenter: return SND_CHMAP_TFC;
case SoundIoChannelIdTopBackLeft: return SND_CHMAP_TRL;
case SoundIoChannelIdTopBackRight: return SND_CHMAP_TRR;
case SoundIoChannelIdTopBackCenter: return SND_CHMAP_TRC;
case SoundIoChannelIdTopFrontLeftCenter: return SND_CHMAP_TFLC;
case SoundIoChannelIdTopFrontRightCenter: return SND_CHMAP_TFRC;
case SoundIoChannelIdTopSideLeft: return SND_CHMAP_TSL;
case SoundIoChannelIdTopSideRight: return SND_CHMAP_TSR;
case SoundIoChannelIdLeftLfe: return SND_CHMAP_LLFE;
case SoundIoChannelIdRightLfe: return SND_CHMAP_RLFE;
case SoundIoChannelIdBottomCenter: return SND_CHMAP_BC;
case SoundIoChannelIdBottomLeftCenter: return SND_CHMAP_BLC;
case SoundIoChannelIdBottomRightCenter: return SND_CHMAP_BRC;
default:
return SND_CHMAP_UNKNOWN;
}
}
static void get_channel_layout(struct SoundIoChannelLayout *dest, snd_pcm_chmap_t *chmap) {
int channel_count = soundio_int_min(SOUNDIO_MAX_CHANNELS, chmap->channels);
dest->channel_count = channel_count;
for (int i = 0; i < channel_count; i += 1) {
dest->channels[i] = from_alsa_chmap_pos(chmap->pos[i]);
}
soundio_channel_layout_detect_builtin(dest);
}
static int handle_channel_maps(struct SoundIoDevice *device, snd_pcm_chmap_query_t **maps) {
if (!maps)
return 0;
snd_pcm_chmap_query_t **p;
snd_pcm_chmap_query_t *v;
// one iteration to count
int layout_count = 0;
for (p = maps; (v = *p) && layout_count < SOUNDIO_MAX_CHANNELS; p += 1, layout_count += 1) { }
device->layouts = ALLOCATE(struct SoundIoChannelLayout, layout_count);
if (!device->layouts) {
snd_pcm_free_chmaps(maps);
return SoundIoErrorNoMem;
}
device->layout_count = layout_count;
// iterate again to collect data
int layout_index;
for (p = maps, layout_index = 0;
(v = *p) && layout_index < layout_count;
p += 1, layout_index += 1)
{
get_channel_layout(&device->layouts[layout_index], &v->map);
}
snd_pcm_free_chmaps(maps);
return 0;
}
static snd_pcm_format_t to_alsa_fmt(enum SoundIoFormat fmt) {
switch (fmt) {
case SoundIoFormatS8: return SND_PCM_FORMAT_S8;
case SoundIoFormatU8: return SND_PCM_FORMAT_U8;
case SoundIoFormatS16LE: return SND_PCM_FORMAT_S16_LE;
case SoundIoFormatS16BE: return SND_PCM_FORMAT_S16_BE;
case SoundIoFormatU16LE: return SND_PCM_FORMAT_U16_LE;
case SoundIoFormatU16BE: return SND_PCM_FORMAT_U16_BE;
case SoundIoFormatS24LE: return SND_PCM_FORMAT_S24_LE;
case SoundIoFormatS24BE: return SND_PCM_FORMAT_S24_BE;
case SoundIoFormatU24LE: return SND_PCM_FORMAT_U24_LE;
case SoundIoFormatU24BE: return SND_PCM_FORMAT_U24_BE;
case SoundIoFormatS32LE: return SND_PCM_FORMAT_S32_LE;
case SoundIoFormatS32BE: return SND_PCM_FORMAT_S32_BE;
case SoundIoFormatU32LE: return SND_PCM_FORMAT_U32_LE;
case SoundIoFormatU32BE: return SND_PCM_FORMAT_U32_BE;
case SoundIoFormatFloat32LE: return SND_PCM_FORMAT_FLOAT_LE;
case SoundIoFormatFloat32BE: return SND_PCM_FORMAT_FLOAT_BE;
case SoundIoFormatFloat64LE: return SND_PCM_FORMAT_FLOAT64_LE;
case SoundIoFormatFloat64BE: return SND_PCM_FORMAT_FLOAT64_BE;
case SoundIoFormatInvalid:
return SND_PCM_FORMAT_UNKNOWN;
}
return SND_PCM_FORMAT_UNKNOWN;
}
static void test_fmt_mask(struct SoundIoDevice *device, const snd_pcm_format_mask_t *fmt_mask,
enum SoundIoFormat fmt)
{
if (snd_pcm_format_mask_test(fmt_mask, to_alsa_fmt(fmt))) {
device->formats[device->format_count] = fmt;
device->format_count += 1;
}
}
static int set_access(snd_pcm_t *handle, snd_pcm_hw_params_t *hwparams, snd_pcm_access_t *out_access) {
for (int i = 0; i < ARRAY_LENGTH(prioritized_access_types); i += 1) {
snd_pcm_access_t access = prioritized_access_types[i];
int err = snd_pcm_hw_params_set_access(handle, hwparams, access);
if (err >= 0) {
if (out_access)
*out_access = access;
return 0;
}
}
return SoundIoErrorOpeningDevice;
}
// this function does not override device->formats, so if you want it to, deallocate and set it to NULL
static int probe_open_device(struct SoundIoDevice *device, snd_pcm_t *handle, int resample,
int *out_channels_min, int *out_channels_max)
{
struct SoundIoDevicePrivate *dev = (struct SoundIoDevicePrivate *)device;
int err;
snd_pcm_hw_params_t *hwparams;
snd_pcm_hw_params_alloca(&hwparams);
if ((err = snd_pcm_hw_params_any(handle, hwparams)) < 0)
return SoundIoErrorOpeningDevice;
if ((err = snd_pcm_hw_params_set_rate_resample(handle, hwparams, resample)) < 0)
return SoundIoErrorOpeningDevice;
if ((err = set_access(handle, hwparams, NULL)))
return err;
unsigned int channels_min;
unsigned int channels_max;
if ((err = snd_pcm_hw_params_get_channels_min(hwparams, &channels_min)) < 0)
return SoundIoErrorOpeningDevice;
if ((err = snd_pcm_hw_params_set_channels_last(handle, hwparams, &channels_max)) < 0)
return SoundIoErrorOpeningDevice;
*out_channels_min = channels_min;
*out_channels_max = channels_max;
unsigned int rate_min;
unsigned int rate_max;
if ((err = snd_pcm_hw_params_get_rate_min(hwparams, &rate_min, NULL)) < 0)
return SoundIoErrorOpeningDevice;
if ((err = snd_pcm_hw_params_set_rate_last(handle, hwparams, &rate_max, NULL)) < 0)
return SoundIoErrorOpeningDevice;
device->sample_rate_count = 1;
device->sample_rates = &dev->prealloc_sample_rate_range;
device->sample_rates[0].min = rate_min;
device->sample_rates[0].max = rate_max;
double one_over_actual_rate = 1.0 / (double)rate_max;
// Purposefully leave the parameters with the highest rate, highest channel count.
snd_pcm_uframes_t min_frames;
snd_pcm_uframes_t max_frames;
if ((err = snd_pcm_hw_params_get_buffer_size_min(hwparams, &min_frames)) < 0)
return SoundIoErrorOpeningDevice;
if ((err = snd_pcm_hw_params_get_buffer_size_max(hwparams, &max_frames)) < 0)
return SoundIoErrorOpeningDevice;
device->software_latency_min = min_frames * one_over_actual_rate;
device->software_latency_max = max_frames * one_over_actual_rate;
if ((err = snd_pcm_hw_params_set_buffer_size_first(handle, hwparams, &min_frames)) < 0)
return SoundIoErrorOpeningDevice;
snd_pcm_format_mask_t *fmt_mask;
snd_pcm_format_mask_alloca(&fmt_mask);
snd_pcm_format_mask_none(fmt_mask);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_S8);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_U8);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_S16_LE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_S16_BE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_U16_LE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_U16_BE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_S24_LE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_S24_BE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_U24_LE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_U24_BE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_S32_LE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_S32_BE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_U32_LE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_U32_BE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_FLOAT_LE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_FLOAT_BE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_FLOAT64_LE);
snd_pcm_format_mask_set(fmt_mask, SND_PCM_FORMAT_FLOAT64_BE);
if ((err = snd_pcm_hw_params_set_format_mask(handle, hwparams, fmt_mask)) < 0)
return SoundIoErrorOpeningDevice;
if (!device->formats) {
snd_pcm_hw_params_get_format_mask(hwparams, fmt_mask);
device->formats = ALLOCATE(enum SoundIoFormat, 18);
if (!device->formats)
return SoundIoErrorNoMem;
device->format_count = 0;
test_fmt_mask(device, fmt_mask, SoundIoFormatS8);
test_fmt_mask(device, fmt_mask, SoundIoFormatU8);
test_fmt_mask(device, fmt_mask, SoundIoFormatS16LE);
test_fmt_mask(device, fmt_mask, SoundIoFormatS16BE);
test_fmt_mask(device, fmt_mask, SoundIoFormatU16LE);
test_fmt_mask(device, fmt_mask, SoundIoFormatU16BE);
test_fmt_mask(device, fmt_mask, SoundIoFormatS24LE);
test_fmt_mask(device, fmt_mask, SoundIoFormatS24BE);
test_fmt_mask(device, fmt_mask, SoundIoFormatU24LE);
test_fmt_mask(device, fmt_mask, SoundIoFormatU24BE);
test_fmt_mask(device, fmt_mask, SoundIoFormatS32LE);
test_fmt_mask(device, fmt_mask, SoundIoFormatS32BE);
test_fmt_mask(device, fmt_mask, SoundIoFormatU32LE);
test_fmt_mask(device, fmt_mask, SoundIoFormatU32BE);
test_fmt_mask(device, fmt_mask, SoundIoFormatFloat32LE);
test_fmt_mask(device, fmt_mask, SoundIoFormatFloat32BE);
test_fmt_mask(device, fmt_mask, SoundIoFormatFloat64LE);
test_fmt_mask(device, fmt_mask, SoundIoFormatFloat64BE);
}
return 0;
}
static int probe_device(struct SoundIoDevice *device, snd_pcm_chmap_query_t **maps) {
int err;
snd_pcm_t *handle;
snd_pcm_stream_t stream = aim_to_stream(device->aim);
if ((err = snd_pcm_open(&handle, device->id, stream, 0)) < 0) {
handle_channel_maps(device, maps);
return SoundIoErrorOpeningDevice;
}
int channels_min, channels_max;
if ((err = probe_open_device(device, handle, 0, &channels_min, &channels_max))) {
handle_channel_maps(device, maps);
snd_pcm_close(handle);
return err;
}
if (!maps) {
maps = snd_pcm_query_chmaps(handle);
if (!maps) {
// device gave us no channel maps. we're forced to conclude that
// the min and max channel counts are correct.
int layout_count = 0;
for (int i = 0; i < soundio_channel_layout_builtin_count(); i += 1) {
const struct SoundIoChannelLayout *layout = soundio_channel_layout_get_builtin(i);
if (layout->channel_count >= channels_min && layout->channel_count <= channels_max) {
layout_count += 1;
}
}
device->layout_count = layout_count;
device->layouts = ALLOCATE(struct SoundIoChannelLayout, device->layout_count);
if (!device->layouts) {
snd_pcm_close(handle);
return SoundIoErrorNoMem;
}
int layout_index = 0;
for (int i = 0; i < soundio_channel_layout_builtin_count(); i += 1) {
const struct SoundIoChannelLayout *layout = soundio_channel_layout_get_builtin(i);
if (layout->channel_count >= channels_min && layout->channel_count <= channels_max) {
device->layouts[layout_index++] = *soundio_channel_layout_get_builtin(i);
}
}
}
}
snd_pcm_chmap_t *chmap = snd_pcm_get_chmap(handle);
if (chmap) {
get_channel_layout(&device->current_layout, chmap);
free(chmap);
}
if ((err = handle_channel_maps(device, maps))) {
snd_pcm_close(handle);
return err;
}
maps = NULL;
if (!device->is_raw) {
if (device->sample_rates[0].min == device->sample_rates[0].max)
device->sample_rate_current = device->sample_rates[0].min;
if (device->software_latency_min == device->software_latency_max)
device->software_latency_current = device->software_latency_min;
// now say that resampling is OK and see what the real min and max is.
if ((err = probe_open_device(device, handle, 1, &channels_min, &channels_max)) < 0) {
snd_pcm_close(handle);
return SoundIoErrorOpeningDevice;
}
}
snd_pcm_close(handle);
return 0;
}
static inline bool str_has_prefix(const char *big_str, const char *prefix) {
return strncmp(big_str, prefix, strlen(prefix)) == 0;
}
static int refresh_devices(struct SoundIoPrivate *si) {
struct SoundIo *soundio = &si->pub;
struct SoundIoAlsa *sia = &si->backend_data.alsa;
int err;
if ((err = snd_config_update_free_global()) < 0)
return SoundIoErrorSystemResources;
if ((err = snd_config_update()) < 0)
return SoundIoErrorSystemResources;
struct SoundIoDevicesInfo *devices_info = ALLOCATE(struct SoundIoDevicesInfo, 1);
if (!devices_info)
return SoundIoErrorNoMem;
devices_info->default_output_index = -1;
devices_info->default_input_index = -1;
void **hints;
if (snd_device_name_hint(-1, "pcm", &hints) < 0) {
soundio_destroy_devices_info(devices_info);
return SoundIoErrorNoMem;
}
int default_output_index = -1;
int sysdefault_output_index = -1;
int default_input_index = -1;
int sysdefault_input_index = -1;
for (void **hint_ptr = hints; *hint_ptr; hint_ptr += 1) {
char *name = snd_device_name_get_hint(*hint_ptr, "NAME");
// null - libsoundio has its own dummy backend. API clients should use
// that instead of alsa null device.
if (strcmp(name, "null") == 0 ||
// all these surround devices are clutter
str_has_prefix(name, "front:") ||
str_has_prefix(name, "surround21:") ||
str_has_prefix(name, "surround40:") ||
str_has_prefix(name, "surround41:") ||
str_has_prefix(name, "surround50:") ||
str_has_prefix(name, "surround51:") ||
str_has_prefix(name, "surround71:"))
{
free(name);
continue;
}
// One or both of descr and descr1 can be NULL.
char *descr = snd_device_name_get_hint(*hint_ptr, "DESC");
char *descr1 = str_partition_on_char(descr, '\n');
char *io = snd_device_name_get_hint(*hint_ptr, "IOID");
bool is_playback;
bool is_capture;
// Workaround for Raspberry Pi driver bug, reporting itself as output
// when really it is input.
if (descr && strcmp(descr, "bcm2835 ALSA, bcm2835 ALSA") == 0 &&
descr1 && strcmp(descr1, "Direct sample snooping device") == 0)
{
is_playback = false;
is_capture = true;
} else if (descr && strcmp(descr, "bcm2835 ALSA, bcm2835 IEC958/HDMI") == 0 &&
descr1 && strcmp(descr1, "Direct sample snooping device") == 0)
{
is_playback = false;
is_capture = true;
} else if (io) {
if (strcmp(io, "Input") == 0) {
is_playback = false;
is_capture = true;
} else {
assert(strcmp(io, "Output") == 0);
is_playback = true;
is_capture = false;
}
free(io);
} else {
is_playback = true;
is_capture = true;
}
for (int stream_type_i = 0; stream_type_i < ARRAY_LENGTH(stream_types); stream_type_i += 1) {
snd_pcm_stream_t stream = stream_types[stream_type_i];
if (stream == SND_PCM_STREAM_PLAYBACK && !is_playback) continue;
if (stream == SND_PCM_STREAM_CAPTURE && !is_capture) continue;
if (stream == SND_PCM_STREAM_CAPTURE && descr1 &&
(strstr(descr1, "Output") || strstr(descr1, "output")))
{
continue;
}
struct SoundIoDevicePrivate *dev = ALLOCATE(struct SoundIoDevicePrivate, 1);
if (!dev) {
free(name);
free(descr);
soundio_destroy_devices_info(devices_info);
snd_device_name_free_hint(hints);
return SoundIoErrorNoMem;
}
struct SoundIoDevice *device = &dev->pub;
device->ref_count = 1;
device->soundio = soundio;
device->is_raw = false;
device->id = strdup(name);
if (descr1) {
device->name = soundio_alloc_sprintf(NULL, "%s: %s", descr, descr1);
} else if (descr) {
device->name = strdup(descr);
} else {
device->name = strdup(name);
}
if (!device->id || !device->name) {
soundio_device_unref(device);
free(name);
free(descr);
soundio_destroy_devices_info(devices_info);
snd_device_name_free_hint(hints);
return SoundIoErrorNoMem;
}
struct SoundIoListDevicePtr *device_list;
bool is_default = str_has_prefix(name, "default:") || strcmp(name, "default") == 0;
bool is_sysdefault = str_has_prefix(name, "sysdefault:") || strcmp(name, "sysdefault") == 0;
if (stream == SND_PCM_STREAM_PLAYBACK) {
device->aim = SoundIoDeviceAimOutput;
device_list = &devices_info->output_devices;
if (is_default)
default_output_index = device_list->length;
if (is_sysdefault)
sysdefault_output_index = device_list->length;
if (devices_info->default_output_index == -1)
devices_info->default_output_index = device_list->length;
} else {
assert(stream == SND_PCM_STREAM_CAPTURE);
device->aim = SoundIoDeviceAimInput;
device_list = &devices_info->input_devices;
if (is_default)
default_input_index = device_list->length;
if (is_sysdefault)
sysdefault_input_index = device_list->length;
if (devices_info->default_input_index == -1)
devices_info->default_input_index = device_list->length;
}
device->probe_error = probe_device(device, NULL);
if (SoundIoListDevicePtr_append(device_list, device)) {
soundio_device_unref(device);
free(name);
free(descr);
soundio_destroy_devices_info(devices_info);
snd_device_name_free_hint(hints);
return SoundIoErrorNoMem;
}
}
free(name);
free(descr);
}
if (default_input_index >= 0) {
devices_info->default_input_index = default_input_index;
} else if (sysdefault_input_index >= 0) {
devices_info->default_input_index = sysdefault_input_index;
}
if (default_output_index >= 0) {
devices_info->default_output_index = default_output_index;
} else if (sysdefault_output_index >= 0) {
devices_info->default_output_index = sysdefault_output_index;
}
snd_device_name_free_hint(hints);
int card_index = -1;
if (snd_card_next(&card_index) < 0)
return SoundIoErrorSystemResources;
snd_ctl_card_info_t *card_info;
snd_ctl_card_info_alloca(&card_info);
snd_pcm_info_t *pcm_info;
snd_pcm_info_alloca(&pcm_info);
while (card_index >= 0) {
int err;
snd_ctl_t *handle;
char name[32];
sprintf(name, "hw:%d", card_index);
if ((err = snd_ctl_open(&handle, name, 0)) < 0) {
if (err == -ENOENT) {
break;
} else {
soundio_destroy_devices_info(devices_info);
return SoundIoErrorOpeningDevice;
}
}
if ((err = snd_ctl_card_info(handle, card_info)) < 0) {
snd_ctl_close(handle);
soundio_destroy_devices_info(devices_info);
return SoundIoErrorSystemResources;
}
const char *card_name = snd_ctl_card_info_get_name(card_info);
int device_index = -1;
for (;;) {
if (snd_ctl_pcm_next_device(handle, &device_index) < 0) {
snd_ctl_close(handle);
soundio_destroy_devices_info(devices_info);
return SoundIoErrorSystemResources;
}
if (device_index < 0)
break;
snd_pcm_info_set_device(pcm_info, device_index);
snd_pcm_info_set_subdevice(pcm_info, 0);
for (int stream_type_i = 0; stream_type_i < ARRAY_LENGTH(stream_types); stream_type_i += 1) {
snd_pcm_stream_t stream = stream_types[stream_type_i];
snd_pcm_info_set_stream(pcm_info, stream);
if ((err = snd_ctl_pcm_info(handle, pcm_info)) < 0) {
if (err == -ENOENT) {
continue;
} else {
snd_ctl_close(handle);
soundio_destroy_devices_info(devices_info);
return SoundIoErrorSystemResources;
}
}
const char *device_name = snd_pcm_info_get_name(pcm_info);
struct SoundIoDevicePrivate *dev = ALLOCATE(struct SoundIoDevicePrivate, 1);
if (!dev) {
snd_ctl_close(handle);
soundio_destroy_devices_info(devices_info);
return SoundIoErrorNoMem;
}
struct SoundIoDevice *device = &dev->pub;
device->ref_count = 1;
device->soundio = soundio;
device->id = soundio_alloc_sprintf(NULL, "hw:%d,%d", card_index, device_index);
device->name = soundio_alloc_sprintf(NULL, "%s %s", card_name, device_name);
device->is_raw = true;
if (!device->id || !device->name) {
soundio_device_unref(device);
snd_ctl_close(handle);
soundio_destroy_devices_info(devices_info);
return SoundIoErrorNoMem;
}
struct SoundIoListDevicePtr *device_list;
if (stream == SND_PCM_STREAM_PLAYBACK) {
device->aim = SoundIoDeviceAimOutput;
device_list = &devices_info->output_devices;
} else {
assert(stream == SND_PCM_STREAM_CAPTURE);
device->aim = SoundIoDeviceAimInput;
device_list = &devices_info->input_devices;
}
snd_pcm_chmap_query_t **maps = snd_pcm_query_chmaps_from_hw(card_index, device_index, -1, stream);
device->probe_error = probe_device(device, maps);
if (SoundIoListDevicePtr_append(device_list, device)) {
soundio_device_unref(device);
soundio_destroy_devices_info(devices_info);
return SoundIoErrorNoMem;
}
}
}
snd_ctl_close(handle);
if (snd_card_next(&card_index) < 0) {
soundio_destroy_devices_info(devices_info);
return SoundIoErrorSystemResources;
}
}
soundio_os_mutex_lock(sia->mutex);
soundio_destroy_devices_info(sia->ready_devices_info);
sia->ready_devices_info = devices_info;
sia->have_devices_flag = true;
soundio_os_cond_signal(sia->cond, sia->mutex);
soundio->on_events_signal(soundio);
soundio_os_mutex_unlock(sia->mutex);
return 0;
}
static void shutdown_backend(struct SoundIoPrivate *si, int err) {
struct SoundIo *soundio = &si->pub;
struct SoundIoAlsa *sia = &si->backend_data.alsa;
soundio_os_mutex_lock(sia->mutex);
sia->shutdown_err = err;
soundio_os_cond_signal(sia->cond, sia->mutex);
soundio->on_events_signal(soundio);
soundio_os_mutex_unlock(sia->mutex);
}
static bool copy_str(char *dest, const char *src, int buf_len) {
for (;;) {
buf_len -= 1;
if (buf_len <= 0)
return false;
*dest = *src;
dest += 1;
src += 1;
if (!*src)
break;
}
*dest = '\0';
return true;
}
static void device_thread_run(void *arg) {
struct SoundIoPrivate *si = (struct SoundIoPrivate *)arg;
struct SoundIoAlsa *sia = &si->backend_data.alsa;
// Some systems cannot read integer variables if they are not
// properly aligned. On other systems, incorrect alignment may
// decrease performance. Hence, the buffer used for reading from
// the inotify file descriptor should have the same alignment as
// struct inotify_event.
char buf[4096] __attribute__ ((aligned(__alignof__(struct inotify_event))));
const struct inotify_event *event;
struct pollfd fds[2];
fds[0].fd = sia->notify_fd;
fds[0].events = POLLIN;
fds[1].fd = sia->notify_pipe_fd[0];
fds[1].events = POLLIN;
int err;
for (;;) {
int poll_num = poll(fds, 2, -1);
if (!SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(sia->abort_flag))
break;
if (poll_num == -1) {
if (errno == EINTR)
continue;
assert(errno != EFAULT);
assert(errno != EINVAL);
assert(errno == ENOMEM);
// Kernel ran out of polling memory.
shutdown_backend(si, SoundIoErrorSystemResources);
return;
}
if (poll_num <= 0)
continue;
bool got_rescan_event = false;
if (fds[0].revents & POLLIN) {
for (;;) {
ssize_t len = read(sia->notify_fd, buf, sizeof(buf));
if (len == -1) {
assert(errno != EBADF);
assert(errno != EFAULT);
assert(errno != EINVAL);
assert(errno != EIO);
assert(errno != EISDIR);
if (errno == EBADF || errno == EFAULT || errno == EINVAL ||
errno == EIO || errno == EISDIR)
{
shutdown_backend(si, SoundIoErrorSystemResources);
return;
}
}
// catches EINTR and EAGAIN
if (len <= 0)
break;
// loop over all events in the buffer
for (char *ptr = buf; ptr < buf + len; ptr += sizeof(struct inotify_event) + event->len) {
event = (const struct inotify_event *) ptr;
if (!((event->mask & IN_CLOSE_WRITE) || (event->mask & IN_DELETE) || (event->mask & IN_CREATE)))
continue;
if (event->mask & IN_ISDIR)
continue;
if (!event->len || event->len < 8)
continue;
if (strncmp(event->name, "controlC", 8) != 0) {
continue;
}
if (event->mask & IN_CREATE) {
if ((err = SoundIoListAlsaPendingFile_add_one(&sia->pending_files))) {
shutdown_backend(si, SoundIoErrorNoMem);
return;
}
struct SoundIoAlsaPendingFile *pending_file =
SoundIoListAlsaPendingFile_last_ptr(&sia->pending_files);
if (!copy_str(pending_file->name, event->name, SOUNDIO_MAX_ALSA_SND_FILE_LEN)) {
SoundIoListAlsaPendingFile_pop(&sia->pending_files);
}
continue;
}
if (sia->pending_files.length > 0) {
// At this point ignore IN_DELETE in favor of waiting until the files
// opened with IN_CREATE have their IN_CLOSE_WRITE event.
if (!(event->mask & IN_CLOSE_WRITE))
continue;
for (int i = 0; i < sia->pending_files.length; i += 1) {
struct SoundIoAlsaPendingFile *pending_file =
SoundIoListAlsaPendingFile_ptr_at(&sia->pending_files, i);
if (strcmp(pending_file->name, event->name) == 0) {
SoundIoListAlsaPendingFile_swap_remove(&sia->pending_files, i);
if (sia->pending_files.length == 0) {
got_rescan_event = true;
}
break;
}
}
} else if (event->mask & IN_DELETE) {
// We are not waiting on created files to be closed, so when
// a delete happens we act on it.
got_rescan_event = true;
}
}
}
}
if (fds[1].revents & POLLIN) {
got_rescan_event = true;
for (;;) {
ssize_t len = read(sia->notify_pipe_fd[0], buf, sizeof(buf));
if (len == -1) {
assert(errno != EBADF);
assert(errno != EFAULT);
assert(errno != EINVAL);
assert(errno != EIO);
assert(errno != EISDIR);
if (errno == EBADF || errno == EFAULT || errno == EINVAL ||
errno == EIO || errno == EISDIR)
{
shutdown_backend(si, SoundIoErrorSystemResources);
return;
}
}
if (len <= 0)
break;
}
}
if (got_rescan_event) {
if ((err = refresh_devices(si))) {
shutdown_backend(si, err);
return;
}
}
}
}
static void my_flush_events(struct SoundIoPrivate *si, bool wait) {
struct SoundIo *soundio = &si->pub;
struct SoundIoAlsa *sia = &si->backend_data.alsa;
bool change = false;
bool cb_shutdown = false;
struct SoundIoDevicesInfo *old_devices_info = NULL;
soundio_os_mutex_lock(sia->mutex);
// block until have devices
while (wait || (!sia->have_devices_flag && !sia->shutdown_err)) {
soundio_os_cond_wait(sia->cond, sia->mutex);
wait = false;
}
if (sia->shutdown_err && !sia->emitted_shutdown_cb) {
sia->emitted_shutdown_cb = true;
cb_shutdown = true;
} else if (sia->ready_devices_info) {
old_devices_info = si->safe_devices_info;
si->safe_devices_info = sia->ready_devices_info;
sia->ready_devices_info = NULL;
change = true;
}
soundio_os_mutex_unlock(sia->mutex);
if (cb_shutdown)
soundio->on_backend_disconnect(soundio, sia->shutdown_err);
else if (change)
soundio->on_devices_change(soundio);
soundio_destroy_devices_info(old_devices_info);
}
static void flush_events_alsa(struct SoundIoPrivate *si) {
my_flush_events(si, false);
}
static void wait_events_alsa(struct SoundIoPrivate *si) {
my_flush_events(si, false);
my_flush_events(si, true);
}
static void wakeup_alsa(struct SoundIoPrivate *si) {
struct SoundIoAlsa *sia = &si->backend_data.alsa;
soundio_os_mutex_lock(sia->mutex);
soundio_os_cond_signal(sia->cond, sia->mutex);
soundio_os_mutex_unlock(sia->mutex);
}
static void force_device_scan_alsa(struct SoundIoPrivate *si) {
struct SoundIoAlsa *sia = &si->backend_data.alsa;
wakeup_device_poll(sia);
}
static void outstream_destroy_alsa(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os) {
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
if (osa->thread) {
SOUNDIO_ATOMIC_FLAG_CLEAR(osa->thread_exit_flag);
wakeup_outstream_poll(osa);
soundio_os_thread_destroy(osa->thread);
osa->thread = NULL;
}
if (osa->handle) {
snd_pcm_close(osa->handle);
osa->handle = NULL;
}
free(osa->poll_fds);
osa->poll_fds = NULL;
free(osa->chmap);
osa->chmap = NULL;
free(osa->sample_buffer);
osa->sample_buffer = NULL;
}
static int outstream_xrun_recovery(struct SoundIoOutStreamPrivate *os, int err) {
struct SoundIoOutStream *outstream = &os->pub;
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
if (err == -EPIPE) {
err = snd_pcm_prepare(osa->handle);
if (err >= 0)
outstream->underflow_callback(outstream);
} else if (err == -ESTRPIPE) {
while ((err = snd_pcm_resume(osa->handle)) == -EAGAIN) {
// wait until suspend flag is released
poll(NULL, 0, 1);
}
if (err < 0)
err = snd_pcm_prepare(osa->handle);
if (err >= 0)
outstream->underflow_callback(outstream);
}
return err;
}
static int instream_xrun_recovery(struct SoundIoInStreamPrivate *is, int err) {
struct SoundIoInStream *instream = &is->pub;
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
if (err == -EPIPE) {
err = snd_pcm_prepare(isa->handle);
if (err >= 0)
instream->overflow_callback(instream);
} else if (err == -ESTRPIPE) {
while ((err = snd_pcm_resume(isa->handle)) == -EAGAIN) {
// wait until suspend flag is released
poll(NULL, 0, 1);
}
if (err < 0)
err = snd_pcm_prepare(isa->handle);
if (err >= 0)
instream->overflow_callback(instream);
}
return err;
}
static int outstream_wait_for_poll(struct SoundIoOutStreamPrivate *os) {
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
int err;
unsigned short revents;
for (;;) {
if ((err = poll(osa->poll_fds, osa->poll_fd_count_with_extra, -1)) < 0) {
return SoundIoErrorStreaming;
}
if (!SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(osa->thread_exit_flag))
return SoundIoErrorInterrupted;
if ((err = snd_pcm_poll_descriptors_revents(osa->handle,
osa->poll_fds, osa->poll_fd_count, &revents)) < 0)
{
return SoundIoErrorStreaming;
}
if (revents & (POLLERR|POLLNVAL|POLLHUP)) {
return 0;
}
if (revents & POLLOUT)
return 0;
}
}
static int instream_wait_for_poll(struct SoundIoInStreamPrivate *is) {
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
int err;
unsigned short revents;
for (;;) {
if ((err = poll(isa->poll_fds, isa->poll_fd_count, -1)) < 0) {
return err;
}
if ((err = snd_pcm_poll_descriptors_revents(isa->handle,
isa->poll_fds, isa->poll_fd_count, &revents)) < 0)
{
return err;
}
if (revents & (POLLERR|POLLNVAL|POLLHUP)) {
return 0;
}
if (revents & POLLIN)
return 0;
}
}
static void outstream_thread_run(void *arg) {
struct SoundIoOutStreamPrivate *os = (struct SoundIoOutStreamPrivate *) arg;
struct SoundIoOutStream *outstream = &os->pub;
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
int err;
for (;;) {
snd_pcm_state_t state = snd_pcm_state(osa->handle);
switch (state) {
case SND_PCM_STATE_SETUP:
{
if ((err = snd_pcm_prepare(osa->handle)) < 0) {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return;
}
continue;
}
case SND_PCM_STATE_PREPARED:
{
snd_pcm_sframes_t avail = snd_pcm_avail(osa->handle);
if (avail < 0) {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return;
}
if ((snd_pcm_uframes_t)avail == osa->buffer_size_frames) {
outstream->write_callback(outstream, 0, avail);
if (!SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(osa->thread_exit_flag))
return;
continue;
}
if ((err = snd_pcm_start(osa->handle)) < 0) {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return;
}
continue;
}
case SND_PCM_STATE_RUNNING:
case SND_PCM_STATE_PAUSED:
{
if ((err = outstream_wait_for_poll(os))) {
if (err == SoundIoErrorInterrupted)
return;
outstream->error_callback(outstream, err);
return;
}
if (!SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(osa->thread_exit_flag))
return;
if (!SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(osa->clear_buffer_flag)) {
if ((err = snd_pcm_drop(osa->handle)) < 0) {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return;
}
if ((err = snd_pcm_reset(osa->handle)) < 0) {
if (err == -EBADFD) {
// If this happens the snd_pcm_drop will have done
// the function of the reset so it's ok that this
// did not work.
} else {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return;
}
}
continue;
}
snd_pcm_sframes_t avail = snd_pcm_avail_update(osa->handle);
if (avail < 0) {
if ((err = outstream_xrun_recovery(os, avail)) < 0) {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return;
}
continue;
}
if (avail > 0)
outstream->write_callback(outstream, 0, avail);
continue;
}
case SND_PCM_STATE_XRUN:
if ((err = outstream_xrun_recovery(os, -EPIPE)) < 0) {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return;
}
continue;
case SND_PCM_STATE_SUSPENDED:
if ((err = outstream_xrun_recovery(os, -ESTRPIPE)) < 0) {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return;
}
continue;
case SND_PCM_STATE_OPEN:
case SND_PCM_STATE_DRAINING:
case SND_PCM_STATE_DISCONNECTED:
outstream->error_callback(outstream, SoundIoErrorStreaming);
return;
}
}
}
static void instream_thread_run(void *arg) {
struct SoundIoInStreamPrivate *is = (struct SoundIoInStreamPrivate *) arg;
struct SoundIoInStream *instream = &is->pub;
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
int err;
for (;;) {
snd_pcm_state_t state = snd_pcm_state(isa->handle);
switch (state) {
case SND_PCM_STATE_SETUP:
if ((err = snd_pcm_prepare(isa->handle)) < 0) {
instream->error_callback(instream, SoundIoErrorStreaming);
return;
}
continue;
case SND_PCM_STATE_PREPARED:
if ((err = snd_pcm_start(isa->handle)) < 0) {
instream->error_callback(instream, SoundIoErrorStreaming);
return;
}
continue;
case SND_PCM_STATE_RUNNING:
case SND_PCM_STATE_PAUSED:
{
if ((err = instream_wait_for_poll(is)) < 0) {
if (!SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(isa->thread_exit_flag))
return;
instream->error_callback(instream, SoundIoErrorStreaming);
return;
}
if (!SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(isa->thread_exit_flag))
return;
snd_pcm_sframes_t avail = snd_pcm_avail_update(isa->handle);
if (avail < 0) {
if ((err = instream_xrun_recovery(is, avail)) < 0) {
instream->error_callback(instream, SoundIoErrorStreaming);
return;
}
continue;
}
if (avail > 0)
instream->read_callback(instream, 0, avail);
continue;
}
case SND_PCM_STATE_XRUN:
if ((err = instream_xrun_recovery(is, -EPIPE)) < 0) {
instream->error_callback(instream, SoundIoErrorStreaming);
return;
}
continue;
case SND_PCM_STATE_SUSPENDED:
if ((err = instream_xrun_recovery(is, -ESTRPIPE)) < 0) {
instream->error_callback(instream, SoundIoErrorStreaming);
return;
}
continue;
case SND_PCM_STATE_OPEN:
case SND_PCM_STATE_DRAINING:
case SND_PCM_STATE_DISCONNECTED:
instream->error_callback(instream, SoundIoErrorStreaming);
return;
}
}
}
static int outstream_open_alsa(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os) {
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
struct SoundIoOutStream *outstream = &os->pub;
struct SoundIoDevice *device = outstream->device;
SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(osa->clear_buffer_flag);
if (outstream->software_latency == 0.0)
outstream->software_latency = 1.0;
outstream->software_latency = soundio_double_clamp(device->software_latency_min, outstream->software_latency, device->software_latency_max);
int ch_count = outstream->layout.channel_count;
osa->chmap_size = sizeof(int) + sizeof(int) * ch_count;
osa->chmap = (snd_pcm_chmap_t *)ALLOCATE(char, osa->chmap_size);
if (!osa->chmap) {
outstream_destroy_alsa(si, os);
return SoundIoErrorNoMem;
}
int err;
snd_pcm_hw_params_t *hwparams;
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_stream_t stream = aim_to_stream(outstream->device->aim);
if ((err = snd_pcm_open(&osa->handle, outstream->device->id, stream, 0)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
if ((err = snd_pcm_hw_params_any(osa->handle, hwparams)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
int want_resample = !outstream->device->is_raw;
if ((err = snd_pcm_hw_params_set_rate_resample(osa->handle, hwparams, want_resample)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
if ((err = set_access(osa->handle, hwparams, &osa->access))) {
outstream_destroy_alsa(si, os);
return err;
}
if ((err = snd_pcm_hw_params_set_channels(osa->handle, hwparams, ch_count)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
if ((err = snd_pcm_hw_params_set_rate(osa->handle, hwparams, outstream->sample_rate, 0)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
snd_pcm_format_t format = to_alsa_fmt(outstream->format);
int phys_bits_per_sample = snd_pcm_format_physical_width(format);
if (phys_bits_per_sample % 8 != 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorIncompatibleDevice;
}
int phys_bytes_per_sample = phys_bits_per_sample / 8;
if ((err = snd_pcm_hw_params_set_format(osa->handle, hwparams, format)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
osa->buffer_size_frames = outstream->software_latency * outstream->sample_rate;
if ((err = snd_pcm_hw_params_set_buffer_size_near(osa->handle, hwparams, &osa->buffer_size_frames)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
outstream->software_latency = ((double)osa->buffer_size_frames) / (double)outstream->sample_rate;
// write the hardware parameters to device
if ((err = snd_pcm_hw_params(osa->handle, hwparams)) < 0) {
outstream_destroy_alsa(si, os);
return (err == -EINVAL) ? SoundIoErrorIncompatibleDevice : SoundIoErrorOpeningDevice;
}
if ((snd_pcm_hw_params_get_period_size(hwparams, &osa->period_size, NULL)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
// set channel map
osa->chmap->channels = ch_count;
for (int i = 0; i < ch_count; i += 1) {
osa->chmap->pos[i] = to_alsa_chmap_pos(outstream->layout.channels[i]);
}
if ((err = snd_pcm_set_chmap(osa->handle, osa->chmap)) < 0)
outstream->layout_error = SoundIoErrorIncompatibleDevice;
// get current swparams
snd_pcm_sw_params_t *swparams;
snd_pcm_sw_params_alloca(&swparams);
if ((err = snd_pcm_sw_params_current(osa->handle, swparams)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
if ((err = snd_pcm_sw_params_set_start_threshold(osa->handle, swparams, 0)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
if ((err = snd_pcm_sw_params_set_avail_min(osa->handle, swparams, osa->period_size)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
// write the software parameters to device
if ((err = snd_pcm_sw_params(osa->handle, swparams)) < 0) {
outstream_destroy_alsa(si, os);
return (err == -EINVAL) ? SoundIoErrorIncompatibleDevice : SoundIoErrorOpeningDevice;
}
if (osa->access == SND_PCM_ACCESS_RW_INTERLEAVED || osa->access == SND_PCM_ACCESS_RW_NONINTERLEAVED) {
osa->sample_buffer_size = ch_count * osa->period_size * phys_bytes_per_sample;
osa->sample_buffer = ALLOCATE_NONZERO(char, osa->sample_buffer_size);
if (!osa->sample_buffer) {
outstream_destroy_alsa(si, os);
return SoundIoErrorNoMem;
}
}
osa->poll_fd_count = snd_pcm_poll_descriptors_count(osa->handle);
if (osa->poll_fd_count <= 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
osa->poll_fd_count_with_extra = osa->poll_fd_count + 1;
osa->poll_fds = ALLOCATE(struct pollfd, osa->poll_fd_count_with_extra);
if (!osa->poll_fds) {
outstream_destroy_alsa(si, os);
return SoundIoErrorNoMem;
}
if ((err = snd_pcm_poll_descriptors(osa->handle, osa->poll_fds, osa->poll_fd_count)) < 0) {
outstream_destroy_alsa(si, os);
return SoundIoErrorOpeningDevice;
}
struct pollfd *extra_fd = &osa->poll_fds[osa->poll_fd_count];
if (pipe2(osa->poll_exit_pipe_fd, O_NONBLOCK)) {
assert(errno != EFAULT);
assert(errno != EINVAL);
assert(errno == EMFILE || errno == ENFILE);
outstream_destroy_alsa(si, os);
return SoundIoErrorSystemResources;
}
extra_fd->fd = osa->poll_exit_pipe_fd[0];
extra_fd->events = POLLIN;
return 0;
}
static int outstream_start_alsa(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os) {
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
struct SoundIo *soundio = &si->pub;
assert(!osa->thread);
int err;
SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(osa->thread_exit_flag);
if ((err = soundio_os_thread_create(outstream_thread_run, os, soundio->emit_rtprio_warning, &osa->thread)))
return err;
return 0;
}
static int outstream_begin_write_alsa(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os,
struct SoundIoChannelArea **out_areas, int *frame_count)
{
*out_areas = NULL;
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
struct SoundIoOutStream *outstream = &os->pub;
if (osa->access == SND_PCM_ACCESS_RW_INTERLEAVED) {
for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
osa->areas[ch].ptr = osa->sample_buffer + ch * outstream->bytes_per_sample;
osa->areas[ch].step = outstream->bytes_per_frame;
}
osa->write_frame_count = soundio_int_min(*frame_count, osa->period_size);
*frame_count = osa->write_frame_count;
} else if (osa->access == SND_PCM_ACCESS_RW_NONINTERLEAVED) {
for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
osa->areas[ch].ptr = osa->sample_buffer + ch * outstream->bytes_per_sample * osa->period_size;
osa->areas[ch].step = outstream->bytes_per_sample;
}
osa->write_frame_count = soundio_int_min(*frame_count, osa->period_size);
*frame_count = osa->write_frame_count;
} else {
const snd_pcm_channel_area_t *areas;
snd_pcm_uframes_t frames = *frame_count;
int err;
if ((err = snd_pcm_mmap_begin(osa->handle, &areas, &osa->offset, &frames)) < 0) {
if (err == -EPIPE || err == -ESTRPIPE)
return SoundIoErrorUnderflow;
else
return SoundIoErrorStreaming;
}
for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
if ((areas[ch].first % 8 != 0) || (areas[ch].step % 8 != 0))
return SoundIoErrorIncompatibleDevice;
osa->areas[ch].step = areas[ch].step / 8;
osa->areas[ch].ptr = ((char *)areas[ch].addr) + (areas[ch].first / 8) +
(osa->areas[ch].step * osa->offset);
}
osa->write_frame_count = frames;
*frame_count = osa->write_frame_count;
}
*out_areas = osa->areas;
return 0;
}
static int outstream_end_write_alsa(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os) {
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
struct SoundIoOutStream *outstream = &os->pub;
snd_pcm_sframes_t commitres;
if (osa->access == SND_PCM_ACCESS_RW_INTERLEAVED) {
commitres = snd_pcm_writei(osa->handle, osa->sample_buffer, osa->write_frame_count);
} else if (osa->access == SND_PCM_ACCESS_RW_NONINTERLEAVED) {
char *ptrs[SOUNDIO_MAX_CHANNELS];
for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
ptrs[ch] = osa->sample_buffer + ch * outstream->bytes_per_sample * osa->period_size;
}
commitres = snd_pcm_writen(osa->handle, (void**)ptrs, osa->write_frame_count);
} else {
commitres = snd_pcm_mmap_commit(osa->handle, osa->offset, osa->write_frame_count);
}
if (commitres < 0 || commitres != osa->write_frame_count) {
int err = (commitres >= 0) ? -EPIPE : commitres;
if (err == -EPIPE || err == -ESTRPIPE)
return SoundIoErrorUnderflow;
else
return SoundIoErrorStreaming;
}
return 0;
}
static int outstream_clear_buffer_alsa(struct SoundIoPrivate *si,
struct SoundIoOutStreamPrivate *os)
{
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
SOUNDIO_ATOMIC_FLAG_CLEAR(osa->clear_buffer_flag);
return 0;
}
static int outstream_pause_alsa(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os, bool pause) {
if (!si)
return SoundIoErrorInvalid;
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
if (!osa->handle)
return SoundIoErrorInvalid;
if (osa->is_paused == pause)
return 0;
int err;
if ((err = snd_pcm_pause(osa->handle, pause)) < 0) {
return SoundIoErrorIncompatibleDevice;
}
osa->is_paused = pause;
return 0;
}
static int outstream_get_latency_alsa(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os,
double *out_latency)
{
struct SoundIoOutStream *outstream = &os->pub;
struct SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
int err;
snd_pcm_sframes_t delay;
if ((err = snd_pcm_delay(osa->handle, &delay)) < 0) {
return SoundIoErrorStreaming;
}
*out_latency = delay / (double)outstream->sample_rate;
return 0;
}
static void instream_destroy_alsa(struct SoundIoPrivate *si, struct SoundIoInStreamPrivate *is) {
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
if (isa->thread) {
SOUNDIO_ATOMIC_FLAG_CLEAR(isa->thread_exit_flag);
soundio_os_thread_destroy(isa->thread);
isa->thread = NULL;
}
if (isa->handle) {
snd_pcm_close(isa->handle);
isa->handle = NULL;
}
free(isa->poll_fds);
isa->poll_fds = NULL;
free(isa->chmap);
isa->chmap = NULL;
free(isa->sample_buffer);
isa->sample_buffer = NULL;
}
static int instream_open_alsa(struct SoundIoPrivate *si, struct SoundIoInStreamPrivate *is) {
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
struct SoundIoInStream *instream = &is->pub;
struct SoundIoDevice *device = instream->device;
if (instream->software_latency == 0.0)
instream->software_latency = 1.0;
instream->software_latency = soundio_double_clamp(device->software_latency_min, instream->software_latency, device->software_latency_max);
int ch_count = instream->layout.channel_count;
isa->chmap_size = sizeof(int) + sizeof(int) * ch_count;
isa->chmap = (snd_pcm_chmap_t *)ALLOCATE(char, isa->chmap_size);
if (!isa->chmap) {
instream_destroy_alsa(si, is);
return SoundIoErrorNoMem;
}
int err;
snd_pcm_hw_params_t *hwparams;
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_stream_t stream = aim_to_stream(instream->device->aim);
if ((err = snd_pcm_open(&isa->handle, instream->device->id, stream, 0)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
if ((err = snd_pcm_hw_params_any(isa->handle, hwparams)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
int want_resample = !instream->device->is_raw;
if ((err = snd_pcm_hw_params_set_rate_resample(isa->handle, hwparams, want_resample)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
if ((err = set_access(isa->handle, hwparams, &isa->access))) {
instream_destroy_alsa(si, is);
return err;
}
if ((err = snd_pcm_hw_params_set_channels(isa->handle, hwparams, ch_count)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
if ((err = snd_pcm_hw_params_set_rate(isa->handle, hwparams, instream->sample_rate, 0)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
snd_pcm_format_t format = to_alsa_fmt(instream->format);
int phys_bits_per_sample = snd_pcm_format_physical_width(format);
if (phys_bits_per_sample % 8 != 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorIncompatibleDevice;
}
int phys_bytes_per_sample = phys_bits_per_sample / 8;
if ((err = snd_pcm_hw_params_set_format(isa->handle, hwparams, format)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
snd_pcm_uframes_t period_frames = ceil_dbl_to_uframes(0.5 * instream->software_latency * (double)instream->sample_rate);
if ((err = snd_pcm_hw_params_set_period_size_near(isa->handle, hwparams, &period_frames, NULL)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
instream->software_latency = ((double)period_frames) / (double)instream->sample_rate;
isa->period_size = period_frames;
snd_pcm_uframes_t buffer_size_frames;
if ((err = snd_pcm_hw_params_set_buffer_size_last(isa->handle, hwparams, &buffer_size_frames)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
// write the hardware parameters to device
if ((err = snd_pcm_hw_params(isa->handle, hwparams)) < 0) {
instream_destroy_alsa(si, is);
return (err == -EINVAL) ? SoundIoErrorIncompatibleDevice : SoundIoErrorOpeningDevice;
}
// set channel map
isa->chmap->channels = ch_count;
for (int i = 0; i < ch_count; i += 1) {
isa->chmap->pos[i] = to_alsa_chmap_pos(instream->layout.channels[i]);
}
if ((err = snd_pcm_set_chmap(isa->handle, isa->chmap)) < 0)
instream->layout_error = SoundIoErrorIncompatibleDevice;
// get current swparams
snd_pcm_sw_params_t *swparams;
snd_pcm_sw_params_alloca(&swparams);
if ((err = snd_pcm_sw_params_current(isa->handle, swparams)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
// write the software parameters to device
if ((err = snd_pcm_sw_params(isa->handle, swparams)) < 0) {
instream_destroy_alsa(si, is);
return (err == -EINVAL) ? SoundIoErrorIncompatibleDevice : SoundIoErrorOpeningDevice;
}
if (isa->access == SND_PCM_ACCESS_RW_INTERLEAVED || isa->access == SND_PCM_ACCESS_RW_NONINTERLEAVED) {
isa->sample_buffer_size = ch_count * isa->period_size * phys_bytes_per_sample;
isa->sample_buffer = ALLOCATE_NONZERO(char, isa->sample_buffer_size);
if (!isa->sample_buffer) {
instream_destroy_alsa(si, is);
return SoundIoErrorNoMem;
}
}
isa->poll_fd_count = snd_pcm_poll_descriptors_count(isa->handle);
if (isa->poll_fd_count <= 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
isa->poll_fds = ALLOCATE(struct pollfd, isa->poll_fd_count);
if (!isa->poll_fds) {
instream_destroy_alsa(si, is);
return SoundIoErrorNoMem;
}
if ((err = snd_pcm_poll_descriptors(isa->handle, isa->poll_fds, isa->poll_fd_count)) < 0) {
instream_destroy_alsa(si, is);
return SoundIoErrorOpeningDevice;
}
return 0;
}
static int instream_start_alsa(struct SoundIoPrivate *si, struct SoundIoInStreamPrivate *is) {
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
struct SoundIo *soundio = &si->pub;
assert(!isa->thread);
SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(isa->thread_exit_flag);
int err;
if ((err = soundio_os_thread_create(instream_thread_run, is, soundio->emit_rtprio_warning, &isa->thread))) {
instream_destroy_alsa(si, is);
return err;
}
return 0;
}
static int instream_begin_read_alsa(struct SoundIoPrivate *si,
struct SoundIoInStreamPrivate *is, struct SoundIoChannelArea **out_areas, int *frame_count)
{
*out_areas = NULL;
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
struct SoundIoInStream *instream = &is->pub;
if (isa->access == SND_PCM_ACCESS_RW_INTERLEAVED) {
for (int ch = 0; ch < instream->layout.channel_count; ch += 1) {
isa->areas[ch].ptr = isa->sample_buffer + ch * instream->bytes_per_sample;
isa->areas[ch].step = instream->bytes_per_frame;
}
isa->read_frame_count = soundio_int_min(*frame_count, isa->period_size);
*frame_count = isa->read_frame_count;
snd_pcm_sframes_t commitres = snd_pcm_readi(isa->handle, isa->sample_buffer, isa->read_frame_count);
if (commitres < 0 || commitres != isa->read_frame_count) {
int err = (commitres >= 0) ? -EPIPE : commitres;
if ((err = instream_xrun_recovery(is, err)) < 0)
return SoundIoErrorStreaming;
}
} else if (isa->access == SND_PCM_ACCESS_RW_NONINTERLEAVED) {
char *ptrs[SOUNDIO_MAX_CHANNELS];
for (int ch = 0; ch < instream->layout.channel_count; ch += 1) {
isa->areas[ch].ptr = isa->sample_buffer + ch * instream->bytes_per_sample * isa->period_size;
isa->areas[ch].step = instream->bytes_per_sample;
ptrs[ch] = isa->areas[ch].ptr;
}
isa->read_frame_count = soundio_int_min(*frame_count, isa->period_size);
*frame_count = isa->read_frame_count;
snd_pcm_sframes_t commitres = snd_pcm_readn(isa->handle, (void**)ptrs, isa->read_frame_count);
if (commitres < 0 || commitres != isa->read_frame_count) {
int err = (commitres >= 0) ? -EPIPE : commitres;
if ((err = instream_xrun_recovery(is, err)) < 0)
return SoundIoErrorStreaming;
}
} else {
const snd_pcm_channel_area_t *areas;
snd_pcm_uframes_t frames = *frame_count;
int err;
if ((err = snd_pcm_mmap_begin(isa->handle, &areas, &isa->offset, &frames)) < 0) {
if ((err = instream_xrun_recovery(is, err)) < 0)
return SoundIoErrorStreaming;
}
for (int ch = 0; ch < instream->layout.channel_count; ch += 1) {
if ((areas[ch].first % 8 != 0) || (areas[ch].step % 8 != 0))
return SoundIoErrorIncompatibleDevice;
isa->areas[ch].step = areas[ch].step / 8;
isa->areas[ch].ptr = ((char *)areas[ch].addr) + (areas[ch].first / 8) +
(isa->areas[ch].step * isa->offset);
}
isa->read_frame_count = frames;
*frame_count = isa->read_frame_count;
}
*out_areas = isa->areas;
return 0;
}
static int instream_end_read_alsa(struct SoundIoPrivate *si, struct SoundIoInStreamPrivate *is) {
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
if (isa->access == SND_PCM_ACCESS_RW_INTERLEAVED) {
// nothing to do
} else if (isa->access == SND_PCM_ACCESS_RW_NONINTERLEAVED) {
// nothing to do
} else {
snd_pcm_sframes_t commitres = snd_pcm_mmap_commit(isa->handle, isa->offset, isa->read_frame_count);
if (commitres < 0 || commitres != isa->read_frame_count) {
int err = (commitres >= 0) ? -EPIPE : commitres;
if ((err = instream_xrun_recovery(is, err)) < 0)
return SoundIoErrorStreaming;
}
}
return 0;
}
static int instream_pause_alsa(struct SoundIoPrivate *si, struct SoundIoInStreamPrivate *is, bool pause) {
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
if (isa->is_paused == pause)
return 0;
int err;
if ((err = snd_pcm_pause(isa->handle, pause)) < 0)
return SoundIoErrorIncompatibleDevice;
isa->is_paused = pause;
return 0;
}
static int instream_get_latency_alsa(struct SoundIoPrivate *si, struct SoundIoInStreamPrivate *is,
double *out_latency)
{
struct SoundIoInStream *instream = &is->pub;
struct SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
int err;
snd_pcm_sframes_t delay;
if ((err = snd_pcm_delay(isa->handle, &delay)) < 0) {
return SoundIoErrorStreaming;
}
*out_latency = delay / (double)instream->sample_rate;
return 0;
}
int soundio_alsa_init(struct SoundIoPrivate *si) {
struct SoundIoAlsa *sia = &si->backend_data.alsa;
int err;
sia->notify_fd = -1;
sia->notify_wd = -1;
SOUNDIO_ATOMIC_FLAG_TEST_AND_SET(sia->abort_flag);
sia->mutex = soundio_os_mutex_create();
if (!sia->mutex) {
destroy_alsa(si);
return SoundIoErrorNoMem;
}
sia->cond = soundio_os_cond_create();
if (!sia->cond) {
destroy_alsa(si);
return SoundIoErrorNoMem;
}
// set up inotify to watch /dev/snd for devices added or removed
sia->notify_fd = inotify_init1(IN_NONBLOCK);
if (sia->notify_fd == -1) {
err = errno;
assert(err != EINVAL);
destroy_alsa(si);
if (err == EMFILE || err == ENFILE) {
return SoundIoErrorSystemResources;
} else {
assert(err == ENOMEM);
return SoundIoErrorNoMem;
}
}
sia->notify_wd = inotify_add_watch(sia->notify_fd, "/dev/snd", IN_CREATE | IN_CLOSE_WRITE | IN_DELETE);
if (sia->notify_wd == -1) {
err = errno;
assert(err != EACCES);
assert(err != EBADF);
assert(err != EFAULT);
assert(err != EINVAL);
assert(err != ENAMETOOLONG);
destroy_alsa(si);
if (err == ENOSPC) {
return SoundIoErrorSystemResources;
} else if (err == ENOMEM) {
return SoundIoErrorNoMem;
} else {
// Kernel must not have ALSA support.
return SoundIoErrorInitAudioBackend;
}
}
if (pipe2(sia->notify_pipe_fd, O_NONBLOCK)) {
assert(errno != EFAULT);
assert(errno != EINVAL);
assert(errno == EMFILE || errno == ENFILE);
return SoundIoErrorSystemResources;
}
wakeup_device_poll(sia);
if ((err = soundio_os_thread_create(device_thread_run, si, NULL, &sia->thread))) {
destroy_alsa(si);
return err;
}
si->destroy = destroy_alsa;
si->flush_events = flush_events_alsa;
si->wait_events = wait_events_alsa;
si->wakeup = wakeup_alsa;
si->force_device_scan = force_device_scan_alsa;
si->outstream_open = outstream_open_alsa;
si->outstream_destroy = outstream_destroy_alsa;
si->outstream_start = outstream_start_alsa;
si->outstream_begin_write = outstream_begin_write_alsa;
si->outstream_end_write = outstream_end_write_alsa;
si->outstream_clear_buffer = outstream_clear_buffer_alsa;
si->outstream_pause = outstream_pause_alsa;
si->outstream_get_latency = outstream_get_latency_alsa;
si->instream_open = instream_open_alsa;
si->instream_destroy = instream_destroy_alsa;
si->instream_start = instream_start_alsa;
si->instream_begin_read = instream_begin_read_alsa;
si->instream_end_read = instream_end_read_alsa;
si->instream_pause = instream_pause_alsa;
si->instream_get_latency = instream_get_latency_alsa;
return 0;
}
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