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/**
* @file rst/audio.c MP3/ICY HTTP Audio Source
*
* Copyright (C) 2011 Creytiv.com
*/
#define _DEFAULT_SOURCE 1
#define _BSD_SOURCE 1
#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <mpg123.h>
#include "rst.h"
struct ausrc_st {
const struct ausrc *as; /* pointer to base-class (inheritance) */
pthread_t thread;
struct rst *rst;
mpg123_handle *mp3;
struct aubuf *aubuf;
ausrc_read_h *rh;
ausrc_error_h *errh;
void *arg;
bool run;
uint32_t ptime;
size_t sampc;
size_t sampsz;
};
static struct ausrc *ausrc;
static void destructor(void *arg)
{
struct ausrc_st *st = arg;
rst_set_audio(st->rst, NULL);
mem_deref(st->rst);
if (st->run) {
st->run = false;
pthread_join(st->thread, NULL);
}
if (st->mp3) {
mpg123_close(st->mp3);
mpg123_delete(st->mp3);
}
mem_deref(st->aubuf);
}
static void *play_thread(void *arg)
{
uint64_t now, ts = tmr_jiffies();
struct ausrc_st *st = arg;
void *sampv;
size_t num_bytes = st->sampc * st->sampsz;
sampv = mem_alloc(num_bytes, NULL);
if (!sampv)
return NULL;
while (st->run) {
sys_msleep(4);
now = tmr_jiffies();
if (ts > now)
continue;
#if 1
if (now > ts + 100) {
debug("rst: cpu lagging behind (%u ms)\n",
now - ts);
}
#endif
aubuf_read(st->aubuf, sampv, num_bytes);
st->rh(sampv, st->sampc, st->arg);
ts += st->ptime;
}
mem_deref(sampv);
return NULL;
}
static inline int decode(struct ausrc_st *st)
{
int err, ch, encoding;
struct mbuf *mb;
long srate;
mb = mbuf_alloc(4096);
if (!mb)
return ENOMEM;
err = mpg123_read(st->mp3, mb->buf, mb->size, &mb->end);
switch (err) {
case MPG123_NEW_FORMAT:
mpg123_getformat(st->mp3, &srate, &ch, &encoding);
info("rst: new format: %i hz, %i ch, encoding 0x%04x\n",
srate, ch, encoding);
/*@fallthrough@*/
case MPG123_OK:
case MPG123_NEED_MORE:
if (mb->end == 0)
break;
aubuf_append(st->aubuf, mb);
break;
default:
warning("rst: mpg123_read error: %s\n",
mpg123_plain_strerror(err));
break;
}
mem_deref(mb);
return err;
}
void rst_audio_feed(struct ausrc_st *st, const uint8_t *buf, size_t sz)
{
int err;
if (!st)
return;
err = mpg123_feed(st->mp3, buf, sz);
if (err)
return;
while (MPG123_OK == decode(st))
;
}
static int aufmt_to_encoding(enum aufmt fmt)
{
switch (fmt) {
case AUFMT_S16LE: return MPG123_ENC_SIGNED_16;
case AUFMT_FLOAT: return MPG123_ENC_FLOAT_32;
case AUFMT_S24_3LE: return MPG123_ENC_SIGNED_24; /* NOTE: endian */
default: return 0;
}
}
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;
int err;
if (!stp || !as || !prm || !rh)
return EINVAL;
st = mem_zalloc(sizeof(*st), destructor);
if (!st)
return ENOMEM;
st->as = as;
st->rh = rh;
st->errh = errh;
st->arg = arg;
st->mp3 = mpg123_new(NULL, &err);
if (!st->mp3) {
err = ENODEV;
goto out;
}
err = mpg123_open_feed(st->mp3);
if (err != MPG123_OK) {
warning("rst: mpg123_open_feed: %s\n",
mpg123_strerror(st->mp3));
err = ENODEV;
goto out;
}
/* Set wanted output format */
mpg123_format_none(st->mp3);
mpg123_format(st->mp3, prm->srate, prm->ch,
aufmt_to_encoding(prm->fmt));
mpg123_volume(st->mp3, 0.3);
st->sampc = prm->srate * prm->ch * prm->ptime / 1000;
st->sampsz = aufmt_sample_size(prm->fmt);
st->ptime = prm->ptime;
info("rst: audio ptime=%u sampc=%zu aubuf=[%u:%u]\n",
st->ptime, st->sampc,
prm->srate * prm->ch * 2,
prm->srate * prm->ch * 40);
/* 1 - 20 seconds of audio */
err = aubuf_alloc(&st->aubuf,
prm->srate * prm->ch * st->sampsz,
prm->srate * prm->ch * st->sampsz * 20);
if (err)
goto out;
if (ctx && *ctx && (*ctx)->id && !strcmp((*ctx)->id, "rst")) {
st->rst = mem_ref(*ctx);
}
else {
err = rst_alloc(&st->rst, dev);
if (err)
goto out;
if (ctx)
*ctx = (struct media_ctx *)st->rst;
}
rst_set_audio(st->rst, 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;
}
int rst_audio_init(void)
{
int err;
err = mpg123_init();
if (err != MPG123_OK) {
warning("rst: mpg123_init: %s\n", mpg123_plain_strerror(err));
return ENODEV;
}
return ausrc_register(&ausrc, baresip_ausrcl(), "rst", alloc_handler);
}
void rst_audio_close(void)
{
ausrc = mem_deref(ausrc);
mpg123_exit();
}
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