/**
* The process callback for this JACK application.
* It is called by JACK at the appropriate times.
*/
int
process (jack_nframes_t nframes, void *arg)
{
jack_nframes_t net_period;
int rx_bufsize, tx_bufsize;
jack_default_audio_sample_t *buf;
jack_port_t *port;
JSList *node;
int chn;
int size, i;
const char *porttype;
int input_fd;
jack_position_t local_trans_pos;
uint32_t *packet_buf_tx, *packet_bufX;
uint32_t *rx_packet_ptr;
jack_time_t packet_recv_timestamp;
if( bitdepth == 1000 || bitdepth == 999)
net_period = (factor * jack_get_buffer_size(client) * 1024 / jack_get_sample_rate(client) / 8) & (~1) ;
else
net_period = (float) nframes / (float) factor;
rx_bufsize = get_sample_size (bitdepth) * capture_channels * net_period + sizeof (jacknet_packet_header);
tx_bufsize = get_sample_size (bitdepth) * playback_channels * net_period + sizeof (jacknet_packet_header);
/* Allocate a buffer where both In and Out Buffer will fit */
packet_buf_tx = alloca (tx_bufsize);
jacknet_packet_header *pkthdr_tx = (jacknet_packet_header *) packet_buf_tx;
/*
* for latency==0 we need to send out the packet before we wait on the reply.
* but this introduces a cycle of latency, when netsource is connected to itself.
* so we send out before read only in zero latency mode.
*
*/
if( latency == 0 ) {
/* reset packet_bufX... */
packet_bufX = packet_buf_tx + sizeof (jacknet_packet_header) / sizeof (jack_default_audio_sample_t);
/* ---------- Send ---------- */
render_jack_ports_to_payload (bitdepth, playback_ports, playback_srcs, nframes,
packet_bufX, net_period, dont_htonl_floats);
/* fill in packet hdr */
pkthdr_tx->transport_state = jack_transport_query (client, &local_trans_pos);
pkthdr_tx->transport_frame = local_trans_pos.frame;
pkthdr_tx->framecnt = framecnt;
pkthdr_tx->latency = latency;
pkthdr_tx->reply_port = reply_port;
pkthdr_tx->sample_rate = jack_get_sample_rate (client);
pkthdr_tx->period_size = nframes;
/* playback for us is capture on the other side */
pkthdr_tx->capture_channels_audio = playback_channels_audio;
pkthdr_tx->playback_channels_audio = capture_channels_audio;
pkthdr_tx->capture_channels_midi = playback_channels_midi;
pkthdr_tx->playback_channels_midi = capture_channels_midi;
pkthdr_tx->mtu = mtu;
if( freewheeling != 0 )
pkthdr_tx->sync_state = (jack_nframes_t)MASTER_FREEWHEELS;
else
pkthdr_tx->sync_state = (jack_nframes_t)deadline_goodness;
//printf("goodness=%d\n", deadline_goodness );
packet_header_hton (pkthdr_tx);
if (cont_miss < 3 * latency + 5) {
int r;
for( r = 0; r < redundancy; r++ )
netjack_sendto (outsockfd, (char *) packet_buf_tx, tx_bufsize, 0, &destaddr, sizeof (destaddr), mtu);
} else if (cont_miss > 50 + 5 * latency) {
state_connected = 0;
packet_cache_reset_master_address( packcache );
//printf ("Frame %d \tRealy too many packets missed (%d). Let's reset the counter\n", framecnt, cont_miss);
cont_miss = 0;
}
}
/*
* ok... now the RECEIVE code.
*
*/
if( reply_port )
input_fd = insockfd;
else
input_fd = outsockfd;
// for latency == 0 we can poll.
if( (latency == 0) || (freewheeling != 0) ) {
jack_time_t deadline = jack_get_time() + 1000000 * jack_get_buffer_size(client) / jack_get_sample_rate(client);
// Now loop until we get the right packet.
while(1) {
jack_nframes_t got_frame;
if ( ! netjack_poll_deadline( input_fd, deadline ) )
break;
packet_cache_drain_socket(packcache, input_fd);
if (packet_cache_get_next_available_framecnt( packcache, framecnt - latency, &got_frame ))
if( got_frame == (framecnt - latency) )
break;
}
} else {
// normally:
// only drain socket.
packet_cache_drain_socket(packcache, input_fd);
}
size = packet_cache_retreive_packet_pointer( packcache, framecnt - latency, (char**)&rx_packet_ptr, rx_bufsize, &packet_recv_timestamp );
/* First alternative : we received what we expected. Render the data
* to the JACK ports so it can be played. */
if (size == rx_bufsize) {
uint32_t *packet_buf_rx = rx_packet_ptr;
jacknet_packet_header *pkthdr_rx = (jacknet_packet_header *) packet_buf_rx;
packet_bufX = packet_buf_rx + sizeof (jacknet_packet_header) / sizeof (jack_default_audio_sample_t);
// calculate how much time there would have been, if this packet was sent at the deadline.
int recv_time_offset = (int) (jack_get_time() - packet_recv_timestamp);
packet_header_ntoh (pkthdr_rx);
deadline_goodness = recv_time_offset - (int)pkthdr_rx->latency;
//printf( "deadline goodness = %d ---> off: %d\n", deadline_goodness, recv_time_offset );
if (cont_miss) {
//printf("Frame %d \tRecovered from dropouts\n", framecnt);
cont_miss = 0;
}
render_payload_to_jack_ports (bitdepth, packet_bufX, net_period,
capture_ports, capture_srcs, nframes, dont_htonl_floats);
state_currentframe = framecnt;
state_recv_packet_queue_time = recv_time_offset;
state_connected = 1;
sync_state = pkthdr_rx->sync_state;
packet_cache_release_packet( packcache, framecnt - latency );
}
/* Second alternative : we've received something that's not
* as big as expected or we missed a packet. We render silence
* to the ouput ports */
else {
jack_nframes_t latency_estimate;
if( packet_cache_find_latency( packcache, framecnt, &latency_estimate ) )
//if( (state_latency == 0) || (latency_estimate < state_latency) )
state_latency = latency_estimate;
// Set the counters up.
state_currentframe = framecnt;
//state_latency = framecnt - pkthdr->framecnt;
state_netxruns += 1;
//printf ("Frame %d \tPacket missed or incomplete (expected: %d bytes, got: %d bytes)\n", framecnt, rx_bufsize, size);
//printf ("Frame %d \tPacket missed or incomplete\n", framecnt);
cont_miss += 1;
chn = 0;
node = capture_ports;
while (node != NULL) {
port = (jack_port_t *) node->data;
buf = jack_port_get_buffer (port, nframes);
porttype = jack_port_type (port);
if (strncmp (porttype, JACK_DEFAULT_AUDIO_TYPE, jack_port_type_size ()) == 0)
for (i = 0; i < nframes; i++)
buf[i] = 0.0;
else if (strncmp (porttype, JACK_DEFAULT_MIDI_TYPE, jack_port_type_size ()) == 0)
jack_midi_clear_buffer (buf);
node = jack_slist_next (node);
chn++;
}
}
if (latency != 0) {
/* reset packet_bufX... */
packet_bufX = packet_buf_tx + sizeof (jacknet_packet_header) / sizeof (jack_default_audio_sample_t);
/* ---------- Send ---------- */
render_jack_ports_to_payload (bitdepth, playback_ports, playback_srcs, nframes,
packet_bufX, net_period, dont_htonl_floats);
/* fill in packet hdr */
pkthdr_tx->transport_state = jack_transport_query (client, &local_trans_pos);
pkthdr_tx->transport_frame = local_trans_pos.frame;
pkthdr_tx->framecnt = framecnt;
pkthdr_tx->latency = latency;
pkthdr_tx->reply_port = reply_port;
pkthdr_tx->sample_rate = jack_get_sample_rate (client);
pkthdr_tx->period_size = nframes;
/* playback for us is capture on the other side */
pkthdr_tx->capture_channels_audio = playback_channels_audio;
pkthdr_tx->playback_channels_audio = capture_channels_audio;
pkthdr_tx->capture_channels_midi = playback_channels_midi;
pkthdr_tx->playback_channels_midi = capture_channels_midi;
pkthdr_tx->mtu = mtu;
if( freewheeling != 0 )
pkthdr_tx->sync_state = (jack_nframes_t)MASTER_FREEWHEELS;
else
pkthdr_tx->sync_state = (jack_nframes_t)deadline_goodness;
//printf("goodness=%d\n", deadline_goodness );
packet_header_hton (pkthdr_tx);
if (cont_miss < 3 * latency + 5) {
int r;
for( r = 0; r < redundancy; r++ )
netjack_sendto (outsockfd, (char *) packet_buf_tx, tx_bufsize, 0, &destaddr, sizeof (destaddr), mtu);
} else if (cont_miss > 50 + 5 * latency) {
state_connected = 0;
packet_cache_reset_master_address( packcache );
//printf ("Frame %d \tRealy too many packets missed (%d). Let's reset the counter\n", framecnt, cont_miss);
cont_miss = 0;
}
}
framecnt++;
return 0;
}
int netjack_wait( netjack_driver_state_t *netj )
{
int we_have_the_expected_frame = 0;
jack_nframes_t next_frame_avail;
jack_time_t packet_recv_time_stamp;
jacknet_packet_header *pkthdr;
if( !netj->next_deadline_valid ) {
netj->next_deadline = jack_get_time() + netj->period_usecs;
netj->next_deadline_valid = 1;
}
// Increment expected frame here.
if( netj->expected_framecnt_valid ) {
netj->expected_framecnt += 1;
} else {
// starting up.... lets look into the packetcache, and fetch the highest packet.
packet_cache_drain_socket( netj->packcache, netj->sockfd );
if( packet_cache_get_highest_available_framecnt( netj->packcache, &next_frame_avail ) ) {
netj->expected_framecnt = next_frame_avail;
netj->expected_framecnt_valid = 1;
} else {
// no packets there... start normally.
netj->expected_framecnt = 0;
netj->expected_framecnt_valid = 1;
}
}
//jack_log( "expect %d", netj->expected_framecnt );
// Now check if required packet is already in the cache.
// then poll (have deadline calculated)
// then drain socket, rinse and repeat.
while(1) {
if( packet_cache_get_next_available_framecnt( netj->packcache, netj->expected_framecnt, &next_frame_avail) ) {
if( next_frame_avail == netj->expected_framecnt ) {
we_have_the_expected_frame = 1;
if( !netj->always_deadline )
break;
}
}
if( ! netjack_poll_deadline( netj->sockfd, netj->next_deadline ) ) {
break;
}
packet_cache_drain_socket( netj->packcache, netj->sockfd );
}
// check if we know who to send our packets too.
if (!netj->srcaddress_valid)
if( netj->packcache->master_address_valid ) {
memcpy (&(netj->syncsource_address), &(netj->packcache->master_address), sizeof( struct sockaddr_in ) );
netj->srcaddress_valid = 1;
}
// XXX: switching mode unconditionally is stupid.
// if we were running free perhaps we like to behave differently
// ie. fastforward one packet etc.
// well... this is the first packet we see. hmm.... dunno ;S
// it works... so...
netj->running_free = 0;
//if( !we_have_the_expected_frame )
// jack_error( "netxrun... %d", netj->expected_framecnt );
if( we_have_the_expected_frame ) {
jack_time_t now = jack_get_time();
if( now < netj->next_deadline )
netj->time_to_deadline = netj->next_deadline - now;
else
netj->time_to_deadline = 0;
packet_cache_retreive_packet_pointer( netj->packcache, netj->expected_framecnt, (char **) &(netj->rx_buf), netj->rx_bufsize , &packet_recv_time_stamp);
pkthdr = (jacknet_packet_header *) netj->rx_buf;
packet_header_ntoh(pkthdr);
netj->deadline_goodness = (int)pkthdr->sync_state;
netj->packet_data_valid = 1;
int want_deadline;
if( netj->jitter_val != 0 )
want_deadline = netj->jitter_val;
else if( netj->latency < 4 )
want_deadline = -netj->period_usecs/2;
else
want_deadline = (netj->period_usecs/4+10*(int)netj->period_usecs*netj->latency/100);
if( netj->deadline_goodness != MASTER_FREEWHEELS ) {
if( netj->deadline_goodness < want_deadline ) {
netj->next_deadline -= netj->period_usecs/100;
//jack_log( "goodness: %d, Adjust deadline: --- %d\n", netj->deadline_goodness, (int) netj->period_usecs*netj->latency/100 );
}
if( netj->deadline_goodness > want_deadline ) {
netj->next_deadline += netj->period_usecs/100;
//jack_log( "goodness: %d, Adjust deadline: +++ %d\n", netj->deadline_goodness, (int) netj->period_usecs*netj->latency/100 );
}
}
// if( netj->next_deadline < (netj->period_usecs*70/100) ) {
// jack_error( "master is forcing deadline_offset to below 70%% of period_usecs... increase latency setting on master" );
// netj->deadline_offset = (netj->period_usecs*90/100);
// }
netj->next_deadline += netj->period_usecs;
} else {
netj->time_to_deadline = 0;
netj->next_deadline += netj->period_usecs;
// bah... the packet is not there.
// either
// - it got lost.
// - its late
// - sync source is not sending anymore.
// lets check if we have the next packets, we will just run a cycle without data.
// in that case.
if( packet_cache_get_next_available_framecnt( netj->packcache, netj->expected_framecnt, &next_frame_avail) )
{
jack_nframes_t offset = next_frame_avail - netj->expected_framecnt;
//XXX: hmm... i need to remember why resync_threshold wasnt right.
//if( offset < netj->resync_threshold )
if( offset < 10 ) {
// ok. dont do nothing. we will run without data.
// this seems to be one or 2 lost packets.
//
// this can also be reordered packet jitter.
// (maybe this is not happening in real live)
// but it happens in netem.
netj->packet_data_valid = 0;
// I also found this happening, when the packet queue, is too full.
// but wtf ? use a smaller latency. this link can handle that ;S
if( packet_cache_get_fill( netj->packcache, netj->expected_framecnt ) > 80.0 )
netj->next_deadline -= netj->period_usecs/2;
} else {
// the diff is too high. but we have a packet in the future.
// lets resync.
netj->expected_framecnt = next_frame_avail;
packet_cache_retreive_packet_pointer( netj->packcache, netj->expected_framecnt, (char **) &(netj->rx_buf), netj->rx_bufsize, NULL );
pkthdr = (jacknet_packet_header *) netj->rx_buf;
packet_header_ntoh(pkthdr);
//netj->deadline_goodness = 0;
netj->deadline_goodness = (int)pkthdr->sync_state - (int)netj->period_usecs * offset;
netj->next_deadline_valid = 0;
netj->packet_data_valid = 1;
}
} else {
// no packets in buffer.
netj->packet_data_valid = 0;
//printf( "frame %d No Packet in queue. num_lost_packets = %d \n", netj->expected_framecnt, netj->num_lost_packets );
if( netj->num_lost_packets < 5 ) {
// ok. No Packet in queue. The packet was either lost,
// or we are running too fast.
//
// Adjusting the deadline unconditionally resulted in
// too many xruns on master.
// But we need to adjust for the case we are running too fast.
// So lets check if the last packet is there now.
//
// It would not be in the queue anymore, if it had been
// retrieved. This might break for redundancy, but
// i will make the packet cache drop redundant packets,
// that have already been retreived.
//
if( packet_cache_get_highest_available_framecnt( netj->packcache, &next_frame_avail) ) {
if( next_frame_avail == (netj->expected_framecnt - 1) ) {
// Ok. the last packet is there now.
// and it had not been retrieved.
//
// TODO: We are still dropping 2 packets.
// perhaps we can adjust the deadline
// when (num_packets lost == 0)
// This might still be too much.
netj->next_deadline += netj->period_usecs;
}
}
} else if( (netj->num_lost_packets <= 100) ) {
// lets try adjusting the deadline harder, for some packets, we might have just ran 2 fast.
netj->next_deadline += netj->period_usecs*netj->latency/8;
} else {
// But now we can check for any new frame available.
//
if( packet_cache_get_highest_available_framecnt( netj->packcache, &next_frame_avail) ) {
netj->expected_framecnt = next_frame_avail;
packet_cache_retreive_packet_pointer( netj->packcache, netj->expected_framecnt, (char **) &(netj->rx_buf), netj->rx_bufsize, NULL );
pkthdr = (jacknet_packet_header *) netj->rx_buf;
packet_header_ntoh(pkthdr);
netj->deadline_goodness = pkthdr->sync_state;
netj->next_deadline_valid = 0;
netj->packet_data_valid = 1;
netj->running_free = 0;
jack_info( "resync after freerun... %d", netj->expected_framecnt );
} else {
if( netj->num_lost_packets == 101 ) {
jack_info( "master seems gone... entering freerun mode", netj->expected_framecnt );
}
netj->running_free = 1;
// when we really dont see packets.
// reset source address. and open possibility for new master.
// maybe dsl reconnect. Also restart of netsource without fix
// reply address changes port.
if (netj->num_lost_packets > 200 ) {
netj->srcaddress_valid = 0;
packet_cache_reset_master_address( netj->packcache );
}
}
}
}
}
int retval = 0;
if( !netj->packet_data_valid ) {
netj->num_lost_packets += 1;
if( netj->num_lost_packets == 1 )
retval = netj->period_usecs;
} else {
if( (netj->num_lost_packets>1) && !netj->running_free )
retval = (netj->num_lost_packets-1) * netj->period_usecs;
netj->num_lost_packets = 0;
}
return retval;
}