/*
* "Write" a multichannel frame downstream. This would split
* the multichannel frame into individual mono channel, and write
* it to the appropriate port.
*/
static pj_status_t put_frame(pjmedia_port *this_port,
pjmedia_frame *frame)
{
struct splitcomb *sc = (struct splitcomb*) this_port;
unsigned ch;
/* Handle null frame */
if (frame->type == PJMEDIA_FRAME_TYPE_NONE) {
for (ch=0; ch < PJMEDIA_PIA_CCNT(&this_port->info); ++ch) {
pjmedia_port *port = sc->port_desc[ch].port;
if (!port) continue;
if (!sc->port_desc[ch].reversed) {
pjmedia_port_put_frame(port, frame);
} else {
struct reverse_port *rport = (struct reverse_port*)port;
/* Update the number of NULL frames received. Once we have too
* many of this, we'll stop calling op_update() to let the
* media be suspended.
*/
if (++rport->buf[DIR_DOWNSTREAM].null_cnt >
rport->max_null_frames)
{
/* Prevent the counter from overflowing and resetting
* back to zero
*/
rport->buf[DIR_DOWNSTREAM].null_cnt =
rport->max_null_frames + 1;
continue;
}
/* Write zero port to delaybuf so that it doesn't underflow.
* If we don't do this, get_frame() on this direction will
* cause delaybuf to generate missing frame and the last
* frame transmitted to delaybuf will be replayed multiple
* times, which doesn't sound good.
*/
/* Update rport state. */
op_update(rport, DIR_DOWNSTREAM, OP_PUT);
/* Discard frame if rport is paused on this direction */
if (rport->buf[DIR_DOWNSTREAM].paused)
continue;
/* Generate zero frame. */
pjmedia_zero_samples(sc->put_buf,
PJMEDIA_PIA_SPF(&port->info));
/* Put frame to delay buffer */
pjmedia_delay_buf_put(rport->buf[DIR_DOWNSTREAM].dbuf,
sc->put_buf);
}
}
return PJ_SUCCESS;
}
/* Not sure how we would handle partial frame, so better reject
* it for now.
*/
PJ_ASSERT_RETURN(frame->size == PJMEDIA_PIA_AVG_FSZ(&this_port->info),
PJ_EINVAL);
/*
* Write mono frame into each channels
*/
for (ch=0; ch < PJMEDIA_PIA_CCNT(&this_port->info); ++ch) {
pjmedia_port *port = sc->port_desc[ch].port;
if (!port)
continue;
/* Extract the mono frame to temporary buffer */
extract_mono_frame((const pj_int16_t*)frame->buf, sc->put_buf, ch,
PJMEDIA_PIA_CCNT(&this_port->info),
(unsigned)frame->size * 8 /
PJMEDIA_PIA_BITS(&this_port->info) /
PJMEDIA_PIA_CCNT(&this_port->info));
if (!sc->port_desc[ch].reversed) {
/* Write to normal port */
pjmedia_frame mono_frame;
mono_frame.buf = sc->put_buf;
mono_frame.size = frame->size / PJMEDIA_PIA_CCNT(&this_port->info);
mono_frame.type = frame->type;
mono_frame.timestamp.u64 = frame->timestamp.u64;
/* Write */
pjmedia_port_put_frame(port, &mono_frame);
} else {
/* Write to reversed phase port */
struct reverse_port *rport = (struct reverse_port*)port;
/* Reset NULL frame counter */
rport->buf[DIR_DOWNSTREAM].null_cnt = 0;
/* Update rport state. */
op_update(rport, DIR_DOWNSTREAM, OP_PUT);
if (!rport->buf[DIR_DOWNSTREAM].paused) {
pjmedia_delay_buf_put(rport->buf[DIR_DOWNSTREAM].dbuf,
sc->put_buf);
}
}
}
return PJ_SUCCESS;
}
/*
* Get a multichannel frame upstream.
* This will get mono channel frame from each port and put the
* mono frame into the multichannel frame.
*/
static pj_status_t get_frame(pjmedia_port *this_port,
pjmedia_frame *frame)
{
struct splitcomb *sc = (struct splitcomb*) this_port;
unsigned ch;
pj_bool_t has_frame = PJ_FALSE;
/* Read frame from each port */
for (ch=0; ch < PJMEDIA_PIA_CCNT(&this_port->info); ++ch) {
pjmedia_port *port = sc->port_desc[ch].port;
pjmedia_frame mono_frame;
pj_status_t status;
if (!port) {
pjmedia_zero_samples(sc->get_buf,
PJMEDIA_PIA_SPF(&this_port->info) /
PJMEDIA_PIA_CCNT(&this_port->info));
} else if (sc->port_desc[ch].reversed == PJ_FALSE) {
/* Read from normal port */
mono_frame.buf = sc->get_buf;
mono_frame.size = PJMEDIA_PIA_AVG_FSZ(&port->info);
mono_frame.timestamp.u64 = frame->timestamp.u64;
status = pjmedia_port_get_frame(port, &mono_frame);
if (status != PJ_SUCCESS ||
mono_frame.type != PJMEDIA_FRAME_TYPE_AUDIO)
{
pjmedia_zero_samples(sc->get_buf,
PJMEDIA_PIA_SPF(&port->info));
}
frame->timestamp.u64 = mono_frame.timestamp.u64;
} else {
/* Read from temporary buffer for reverse port */
struct reverse_port *rport = (struct reverse_port*)port;
/* Update rport state. */
op_update(rport, DIR_UPSTREAM, OP_GET);
if (!rport->buf[DIR_UPSTREAM].paused) {
pjmedia_delay_buf_get(rport->buf[DIR_UPSTREAM].dbuf,
sc->get_buf);
} else {
pjmedia_zero_samples(sc->get_buf,
PJMEDIA_PIA_SPF(&port->info));
}
frame->timestamp.u64 = rport->buf[DIR_UPSTREAM].ts.u64;
}
/* Combine the mono frame into multichannel frame */
store_mono_frame(sc->get_buf,
(pj_int16_t*)frame->buf, ch,
PJMEDIA_PIA_CCNT(&this_port->info),
PJMEDIA_PIA_SPF(&this_port->info) /
PJMEDIA_PIA_CCNT(&this_port->info));
has_frame = PJ_TRUE;
}
/* Return NO_FRAME is we don't get any frames from downstream ports */
if (has_frame) {
frame->type = PJMEDIA_FRAME_TYPE_AUDIO;
frame->size = PJMEDIA_PIA_AVG_FSZ(&this_port->info);
} else
frame->type = PJMEDIA_FRAME_TYPE_NONE;
return PJ_SUCCESS;
}
/*
* Put a frame in the reverse port (upstream direction). This frame
* will be picked up by get_frame() above.
*/
static pj_status_t rport_put_frame(pjmedia_port *this_port,
const pjmedia_frame *frame)
{
struct reverse_port *rport = (struct reverse_port*) this_port;
pj_assert(frame->size <= rport->base.info.bytes_per_frame);
/* Handle NULL frame */
if (frame->type != PJMEDIA_FRAME_TYPE_AUDIO) {
/* Update the number of NULL frames received. Once we have too
* many of this, we'll stop calling op_update() to let the
* media be suspended.
*/
if (++rport->buf[DIR_UPSTREAM].null_cnt > rport->max_null_frames) {
/* Prevent the counter from overflowing and resetting back
* to zero
*/
rport->buf[DIR_UPSTREAM].null_cnt = rport->max_null_frames + 1;
return PJ_SUCCESS;
}
/* Write zero port to delaybuf so that it doesn't underflow.
* If we don't do this, get_frame() on this direction will
* cause delaybuf to generate missing frame and the last
* frame transmitted to delaybuf will be replayed multiple
* times, which doesn't sound good.
*/
/* Update rport state. */
op_update(rport, DIR_UPSTREAM, OP_PUT);
/* Discard frame if rport is paused on this direction */
if (rport->buf[DIR_UPSTREAM].paused)
return PJ_SUCCESS;
/* Generate zero frame. */
pjmedia_zero_samples(rport->tmp_up_buf,
this_port->info.samples_per_frame);
/* Put frame to delay buffer */
return pjmedia_delay_buf_put(rport->buf[DIR_UPSTREAM].dbuf,
rport->tmp_up_buf);
}
/* Not sure how to handle partial frame, so better reject for now */
PJ_ASSERT_RETURN(frame->size == this_port->info.bytes_per_frame,
PJ_EINVAL);
/* Reset NULL frame counter */
rport->buf[DIR_UPSTREAM].null_cnt = 0;
/* Update rport state. */
op_update(rport, DIR_UPSTREAM, OP_PUT);
/* Discard frame if rport is paused on this direction */
if (rport->buf[DIR_UPSTREAM].paused)
return PJ_SUCCESS;
/* Unfortunately must copy to temporary buffer since delay buf
* modifies the frame content.
*/
pjmedia_copy_samples(rport->tmp_up_buf, (const pj_int16_t*)frame->buf,
this_port->info.samples_per_frame);
/* Put frame to delay buffer */
return pjmedia_delay_buf_put(rport->buf[DIR_UPSTREAM].dbuf,
rport->tmp_up_buf);
}
