static int aufile_load(struct mbuf *mb, const char *filename,
uint32_t *srate, uint8_t *channels)
{
struct aufile_prm prm;
struct aufile *af;
int err;
err = aufile_open(&af, &prm, filename, AUFILE_READ);
if (err)
return err;
while (!err) {
uint8_t buf[4096];
size_t i, n;
n = sizeof(buf);
err = aufile_read(af, buf, &n);
if (err || !n)
break;
switch (prm.fmt) {
case AUFMT_S16LE:
err = mbuf_write_mem(mb, buf, n);
break;
case AUFMT_PCMA:
for (i=0; i<n; i++) {
err |= mbuf_write_u16(mb,
g711_alaw2pcm(buf[i]));
}
break;
case AUFMT_PCMU:
for (i=0; i<n; i++) {
err |= mbuf_write_u16(mb,
g711_ulaw2pcm(buf[i]));
}
break;
default:
err = ENOSYS;
break;
}
}
mem_deref(af);
if (!err) {
mb->pos = 0;
*srate = prm.srate;
*channels = prm.channels;
}
return err;
}
static int pcma_decode(struct audec_state *ads, int16_t *sampv,
size_t *sampc, const uint8_t *buf, size_t len)
{
(void)ads;
if (!sampv || !sampc || !buf)
return EINVAL;
if (*sampc < len)
return ENOMEM;
*sampc = len;
while (len--)
*sampv++ = g711_alaw2pcm(*buf++);
return 0;
}
