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/**
* @file aufile.c WAV Audio Source
*
* Copyright (C) 2015 Creytiv.com
*/
#define _DEFAULT_SOURCE 1
#define _BSD_SOURCE 1
#include <pthread.h>
#include <re.h>
#include <rem.h>
#include <baresip.h>
/**
* @defgroup aufile aufile
*
* Audio module for using a WAV-file as audio input
*/
struct ausrc_st {
const struct ausrc *as; /* base class */
struct tmr tmr;
struct aufile *aufile;
struct aubuf *aubuf;
uint32_t ptime;
size_t sampc;
bool run;
pthread_t thread;
ausrc_read_h *rh;
ausrc_error_h *errh;
void *arg;
};
static struct ausrc *ausrc;
static void destructor(void *arg)
{
struct ausrc_st *st = arg;
if (st->run) {
st->run = false;
pthread_join(st->thread, NULL);
}
tmr_cancel(&st->tmr);
mem_deref(st->aufile);
mem_deref(st->aubuf);
}
static void *play_thread(void *arg)
{
uint64_t now, ts = tmr_jiffies();
struct ausrc_st *st = arg;
int16_t *sampv;
sampv = mem_alloc(st->sampc * 2, NULL);
if (!sampv)
return NULL;
while (st->run) {
sys_msleep(4);
now = tmr_jiffies();
if (ts > now)
continue;
aubuf_read_samp(st->aubuf, sampv, st->sampc);
st->rh(sampv, st->sampc, st->arg);
ts += st->ptime;
}
mem_deref(sampv);
info("aufile: player thread exited\n");
return NULL;
}
static void timeout(void *arg)
{
struct ausrc_st *st = arg;
tmr_start(&st->tmr, 1000, timeout, st);
/* check if audio buffer is empty */
if (aubuf_cur_size(st->aubuf) < (2 * st->sampc)) {
info("aufile: end of file\n");
/* error handler must be called from re_main thread */
if (st->errh)
st->errh(0, "end of file", st->arg);
}
}
static int read_file(struct ausrc_st *st)
{
struct mbuf *mb;
int err;
for (;;) {
mb = mbuf_alloc(4096);
if (!mb)
return ENOMEM;
mb->end = mb->size;
err = aufile_read(st->aufile, mb->buf, &mb->end);
if (err)
break;
if (mb->end == 0) {
info("aufile: end of file\n");
break;
}
aubuf_append(st->aubuf, mb);
mb = mem_deref(mb);
}
info("aufile: loaded %zu bytes\n", aubuf_cur_size(st->aubuf));
mem_deref(mb);
return err;
}
static int alloc_handler(struct ausrc_st **stp, const struct ausrc *as,
struct media_ctx **ctx,
struct ausrc_prm *prm, const char *dev,
ausrc_read_h *rh, ausrc_error_h *errh, void *arg)
{
struct ausrc_st *st;
struct aufile_prm fprm;
int err;
(void)ctx;
if (!stp || !as || !prm || !rh)
return EINVAL;
info("aufile: loading input file '%s'\n", dev);
st = mem_zalloc(sizeof(*st), destructor);
if (!st)
return ENOMEM;
st->as = as;
st->rh = rh;
st->errh = errh;
st->arg = arg;
err = aufile_open(&st->aufile, &fprm, dev, AUFILE_READ);
if (err) {
warning("aufile: failed to open file '%s' (%m)\n", dev, err);
goto out;
}
info("aufile: %s: %u Hz, %d channels\n",
dev, fprm.srate, fprm.channels);
if (fprm.srate != prm->srate) {
warning("aufile: input file (%s) must have sample-rate"
" %u Hz\n", dev, prm->srate);
err = ENODEV;
goto out;
}
if (fprm.channels != prm->ch) {
warning("aufile: input file (%s) must have channels = %d\n",
dev, prm->ch);
err = ENODEV;
goto out;
}
if (fprm.fmt != AUFMT_S16LE) {
warning("aufile: input file must have format S16LE\n");
err = ENODEV;
goto out;
}
st->sampc = prm->srate * prm->ch * prm->ptime / 1000;
st->ptime = prm->ptime;
info("aufile: audio ptime=%u sampc=%zu aubuf=[%u:%u]\n",
st->ptime, st->sampc,
prm->srate * prm->ch * 2,
prm->srate * prm->ch * 40);
/* 1 - inf seconds of audio */
err = aubuf_alloc(&st->aubuf,
prm->srate * prm->ch * 2,
0);
if (err)
goto out;
err = read_file(st);
if (err)
goto out;
tmr_start(&st->tmr, 1000, timeout, st);
st->run = true;
err = pthread_create(&st->thread, NULL, play_thread, st);
if (err) {
st->run = false;
goto out;
}
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
static int module_init(void)
{
return ausrc_register(&ausrc, "aufile", alloc_handler);
}
static int module_close(void)
{
ausrc = mem_deref(ausrc);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(aufile) = {
"aufile",
"ausrc",
module_init,
module_close
};
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