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/**
* @file alsa_src.c ALSA sound driver - recorder
*
* Copyright (C) 2010 Alfred E. Heggestad
*/
#define _DEFAULT_SOURCE 1
#define _POSIX_SOURCE 1
#include <sys/types.h>
#include <sys/time.h>
#include <stdlib.h>
#include <unistd.h>
#include <alsa/asoundlib.h>
#include <pthread.h>
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include "alsa.h"
struct ausrc_st {
pthread_t thread;
volatile bool run;
snd_pcm_t *read;
void *sampv;
size_t sampc;
ausrc_read_h *rh;
void *arg;
struct ausrc_prm prm;
char *device;
};
static void ausrc_destructor(void *arg)
{
struct ausrc_st *st = arg;
/* Wait for termination of other thread */
if (st->run) {
debug("alsa: stopping recording thread (%s)\n", st->device);
st->run = false;
(void)pthread_join(st->thread, NULL);
}
if (st->read)
snd_pcm_close(st->read);
mem_deref(st->sampv);
mem_deref(st->device);
}
static void *read_thread(void *arg)
{
struct ausrc_st *st = arg;
uint64_t frames = 0;
int num_frames;
int err;
num_frames = st->prm.srate * st->prm.ptime / 1000;
/* Start */
err = snd_pcm_start(st->read);
if (err) {
warning("alsa: could not start ausrc device '%s' (%s)\n",
st->device, snd_strerror(err));
goto out;
}
while (st->run) {
struct auframe af;
long n;
n = snd_pcm_readi(st->read, st->sampv, num_frames);
if (n == -EPIPE) {
snd_pcm_prepare(st->read);
continue;
}
else if (n <= 0) {
continue;
}
af.fmt = st->prm.fmt;
af.sampv = st->sampv;
af.sampc = n * st->prm.ch;
af.timestamp = frames * AUDIO_TIMEBASE / st->prm.srate;
frames += n;
st->rh(&af, st->arg);
}
out:
return NULL;
}
int alsa_src_alloc(struct ausrc_st **stp, const struct ausrc *as,
struct media_ctx **ctx,
struct ausrc_prm *prm, const char *device,
ausrc_read_h *rh, ausrc_error_h *errh, void *arg)
{
struct ausrc_st *st;
snd_pcm_format_t pcmfmt;
int num_frames;
int err;
(void)ctx;
(void)errh;
if (!stp || !as || !prm || !rh)
return EINVAL;
if (!str_isset(device))
device = alsa_dev;
st = mem_zalloc(sizeof(*st), ausrc_destructor);
if (!st)
return ENOMEM;
err = str_dup(&st->device, device);
if (err)
goto out;
st->prm = *prm;
st->rh = rh;
st->arg = arg;
st->sampc = prm->srate * prm->ch * prm->ptime / 1000;
num_frames = st->prm.srate * st->prm.ptime / 1000;
st->sampv = mem_alloc(aufmt_sample_size(prm->fmt) * st->sampc, NULL);
if (!st->sampv) {
err = ENOMEM;
goto out;
}
err = snd_pcm_open(&st->read, st->device, SND_PCM_STREAM_CAPTURE, 0);
if (err < 0) {
warning("alsa: could not open ausrc device '%s' (%s)\n",
st->device, snd_strerror(err));
goto out;
}
pcmfmt = aufmt_to_alsaformat(prm->fmt);
if (pcmfmt == SND_PCM_FORMAT_UNKNOWN) {
warning("alsa: unknown sample format '%s'\n",
aufmt_name(prm->fmt));
err = EINVAL;
goto out;
}
err = alsa_reset(st->read, st->prm.srate, st->prm.ch, num_frames,
pcmfmt);
if (err) {
warning("alsa: could not reset source '%s' (%s)\n",
st->device, snd_strerror(err));
goto out;
}
st->run = true;
err = pthread_create(&st->thread, NULL, read_thread, st);
if (err) {
st->run = false;
goto out;
}
debug("alsa: recording started (%s) format=%s\n",
st->device, aufmt_name(prm->fmt));
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
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