/**
* Read samples from Audio Source
*
* @note This function has REAL-TIME properties
*
* @note This function may be called from any thread
*
* @param buf Buffer with audio samples
* @param sz Number of bytes in buffer
* @param arg Handler argument
*/
static void ausrc_read_handler(const int16_t *sampv, size_t sampc, void *arg)
{
struct audio *a = arg;
struct autx *tx = &a->tx;
if (tx->muted)
memset((void *)sampv, 0, sampc*2);
(void)aubuf_write_samp(tx->aubuf, sampv, sampc);
if (a->cfg.txmode == AUDIO_MODE_POLL) {
unsigned i;
for (i=0; i<16; i++) {
if (aubuf_cur_size(tx->aubuf) < tx->psize)
break;
poll_aubuf_tx(a);
}
}
/* Exact timing: send Telephony-Events from here */
check_telev(a, tx);
}
/**
* Read samples from Audio Source
*
* @note This function has REAL-TIME properties
*
* @note This function may be called from any thread
*/
static void ausrc_read_handler(const uint8_t *buf, size_t sz, void *arg)
{
struct audio *a = arg;
struct autx *tx = &a->tx;
uint8_t *silence = NULL;
const uint8_t *txbuf = buf;
/* NOTE:
* some devices behave strangely if they receive no RTP,
* so we send silence when muted
*/
if (tx->muted) {
silence = mem_zalloc(sizeof(*silence) * sz, NULL);
txbuf = silence;
}
if (tx->ab) {
if (aubuf_write(tx->ab, txbuf, sz))
goto out;
/* XXX: on limited CPU and specifically coreaudio module
* calling this procedure, which results in audio encoding,
* seems to have an overall negative impact on system
* performance! (coming from interrupt context?)
*/
if (a->cfg.txmode == AUDIO_MODE_POLL)
poll_aubuf_tx(a);
}
out:
/* Exact timing: send Telephony-Events from here */
check_telev(a, tx);
mem_deref(silence);
}
/**
* Read samples from Audio Source
*
* @note This function has REAL-TIME properties
*
* @note This function may be called from any thread
*/
static void ausrc_read_handler(const uint8_t *buf, size_t sz, void *arg)
{
struct audio *a = arg;
struct autx *tx = &a->tx;
if (tx->muted) {
memset((void *)buf, 0, sz);
}
aubuf_write(tx->ab, buf, sz);
if (a->cfg.txmode == AUDIO_MODE_POLL) {
poll_aubuf_tx(a);
}
/* Exact timing: send Telephony-Events from here */
check_telev(a, tx);
}
