jackaudio
/
jack1
mirror of https://github.com/jackaudio/jack1


			
/* -*- mode: c; c-file-style: "linux"; -*- */
/*
   NetJack Abstraction.

   Copyright (C) 2008 Pieter Palmers <pieterpalmers@users.sourceforge.net>
   Copyright (C) 2006 Torben Hohn <torbenh@gmx.de>
   Copyright (C) 2003 Robert Ham <rah@bash.sh>
   Copyright (C) 2001 Paul Davis

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   $Id: net_driver.c,v 1.17 2006/04/16 20:16:10 torbenh Exp $
 */


#include <math.h>
#include <stdio.h>
#include <memory.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <stdarg.h>

#include <jack/types.h>
// for jack_error in jack1
#include "internal.h"

#include "jack/jslist.h"

#include <sys/types.h>

#ifdef WIN32
#include <winsock.h>
#include <malloc.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#endif

#include "config.h"

#include "netjack.h"


#if HAVE_SAMPLERATE
#include <samplerate.h>
#endif

#if HAVE_CELT
#include <celt/celt.h>
#endif

#include "netjack.h"
#include "netjack_packet.h"

// JACK2
//#include "jack/control.h"

#define MIN(x, y) ((x) < (y) ? (x) : (y))

static int sync_state = 1;
static jack_transport_state_t last_transport_state;

static int
net_driver_sync_cb (jack_transport_state_t state, jack_position_t *pos, void *data)
{
	int retval = sync_state;

	if (state == JackTransportStarting && last_transport_state != JackTransportStarting) {
		retval = 0;
	}
//    if (state == JackTransportStarting)
//		jack_info("Starting sync_state = %d", sync_state);
	last_transport_state = state;
	return retval;
}

int netjack_wait ( netjack_driver_state_t *netj, jack_time_t (*get_microseconds)(void) )
{
	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 = get_microseconds () + 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, get_microseconds );
		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, get_microseconds ) ) {
			break;
		}

		packet_cache_drain_socket ( netj->packcache, netj->sockfd, get_microseconds );
	}

	// 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 =  get_microseconds ();
		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;
}

void netjack_send_silence ( netjack_driver_state_t *netj, int syncstate )
{
	int tx_size = get_sample_size (netj->bitdepth) * netj->playback_channels * netj->net_period_up + sizeof(jacknet_packet_header);
	unsigned int *packet_buf, *packet_bufX;

	packet_buf = alloca ( tx_size);
	jacknet_packet_header *tx_pkthdr = (jacknet_packet_header*)packet_buf;
	jacknet_packet_header *rx_pkthdr = (jacknet_packet_header*)netj->rx_buf;

	//framecnt = rx_pkthdr->framecnt;

	netj->reply_port = rx_pkthdr->reply_port;

	// offset packet_bufX by the packetheader.
	packet_bufX = packet_buf + sizeof(jacknet_packet_header) / sizeof(jack_default_audio_sample_t);

	tx_pkthdr->sync_state = syncstate;
	tx_pkthdr->framecnt = netj->expected_framecnt;

	// memset 0 the payload.
	int payload_size = get_sample_size (netj->bitdepth) * netj->playback_channels * netj->net_period_up;
	memset (packet_bufX, 0, payload_size);

	packet_header_hton (tx_pkthdr);
	if (netj->srcaddress_valid) {
		int r;
		if (netj->reply_port) {
			netj->syncsource_address.sin_port = htons (netj->reply_port);
		}

		for ( r = 0; r < netj->redundancy; r++ )
			netjack_sendto (netj->outsockfd, (char*)packet_buf, tx_size,
					0, (struct sockaddr*)&(netj->syncsource_address), sizeof(struct sockaddr_in), netj->mtu);
	}
}


void netjack_attach ( netjack_driver_state_t *netj )
{
	//puts ("net_driver_attach");
	jack_port_t * port;
	char buf[32];
	unsigned int chn;
	int port_flags;


	if ( netj->bitdepth == CELT_MODE ) {
#if HAVE_CELT
#if HAVE_CELT_API_0_7 || HAVE_CELT_API_0_8
		celt_int32 lookahead;
		netj->celt_mode = celt_mode_create ( netj->sample_rate, netj->period_size, NULL );
#else
		celt_int32_t lookahead;
		netj->celt_mode = celt_mode_create ( netj->sample_rate, 1, netj->period_size, NULL );
#endif
		celt_mode_info ( netj->celt_mode, CELT_GET_LOOKAHEAD, &lookahead );
		netj->codec_latency = 2 * lookahead;
#endif
	}

	if (netj->handle_transport_sync) {
		jack_set_sync_callback (netj->client, (JackSyncCallback)net_driver_sync_cb, NULL);
	}

	port_flags = JackPortIsOutput | JackPortIsPhysical | JackPortIsTerminal;

	for (chn = 0; chn < netj->capture_channels_audio; chn++) {
		snprintf (buf, sizeof(buf) - 1, "capture_%u", chn + 1);

		port = jack_port_register (netj->client, buf,
					   JACK_DEFAULT_AUDIO_TYPE,
					   port_flags, 0);
		if (!port) {
			jack_error ("NET: cannot register port for %s", buf);
			break;
		}

		netj->capture_ports =
			jack_slist_append (netj->capture_ports, port);

		if ( netj->bitdepth == CELT_MODE ) {
#if HAVE_CELT
#if HAVE_CELT_API_0_7 || HAVE_CELT_API_0_8
			netj->capture_srcs = jack_slist_append (netj->capture_srcs, celt_decoder_create ( netj->celt_mode, 1, NULL ) );
#else
			netj->capture_srcs = jack_slist_append (netj->capture_srcs, celt_decoder_create ( netj->celt_mode ) );
#endif
#endif
		} else {
#if HAVE_SAMPLERATE
			netj->capture_srcs = jack_slist_append (netj->capture_srcs, src_new (SRC_LINEAR, 1, NULL));
#endif
		}
	}

	for (chn = netj->capture_channels_audio; chn < netj->capture_channels; chn++) {
		snprintf (buf, sizeof(buf) - 1, "capture_%u", chn + 1);

		port = jack_port_register (netj->client, buf,
					   JACK_DEFAULT_MIDI_TYPE,
					   port_flags, 0);
		if (!port) {
			jack_error ("NET: cannot register port for %s", buf);
			break;
		}

		netj->capture_ports =
			jack_slist_append (netj->capture_ports, port);
	}

	port_flags = JackPortIsInput | JackPortIsPhysical | JackPortIsTerminal;

	for (chn = 0; chn < netj->playback_channels_audio; chn++) {
		snprintf (buf, sizeof(buf) - 1, "playback_%u", chn + 1);

		port = jack_port_register (netj->client, buf,
					   JACK_DEFAULT_AUDIO_TYPE,
					   port_flags, 0);

		if (!port) {
			jack_error ("NET: cannot register port for %s", buf);
			break;
		}

		netj->playback_ports =
			jack_slist_append (netj->playback_ports, port);
		if ( netj->bitdepth == CELT_MODE ) {
#if HAVE_CELT
#if HAVE_CELT_API_0_7 || HAVE_CELT_API_0_8
			CELTMode *celt_mode = celt_mode_create ( netj->sample_rate, netj->period_size, NULL );
			netj->playback_srcs = jack_slist_append (netj->playback_srcs, celt_encoder_create ( celt_mode, 1, NULL ) );
#else
			CELTMode *celt_mode = celt_mode_create ( netj->sample_rate, 1, netj->period_size, NULL );
			netj->playback_srcs = jack_slist_append (netj->playback_srcs, celt_encoder_create ( celt_mode ) );
#endif
#endif
		} else {
#if HAVE_SAMPLERATE
			netj->playback_srcs = jack_slist_append (netj->playback_srcs, src_new (SRC_LINEAR, 1, NULL));
#endif
		}
	}
	for (chn = netj->playback_channels_audio; chn < netj->playback_channels; chn++) {
		snprintf (buf, sizeof(buf) - 1, "playback_%u", chn + 1);

		port = jack_port_register (netj->client, buf,
					   JACK_DEFAULT_MIDI_TYPE,
					   port_flags, 0);

		if (!port) {
			jack_error ("NET: cannot register port for %s", buf);
			break;
		}

		netj->playback_ports =
			jack_slist_append (netj->playback_ports, port);
	}

	jack_activate (netj->client);
}


void netjack_detach ( netjack_driver_state_t *netj )
{
	JSList * node;

	for (node = netj->capture_ports; node; node = jack_slist_next (node))
		jack_port_unregister (netj->client,
				      ((jack_port_t*)node->data));

	jack_slist_free (netj->capture_ports);
	netj->capture_ports = NULL;

	for (node = netj->capture_srcs; node; node = jack_slist_next (node)) {
#if HAVE_CELT
		if ( netj->bitdepth == CELT_MODE ) {
			CELTDecoder * decoder = node->data;
			celt_decoder_destroy (decoder);
		} else
#endif
		{
#if HAVE_SAMPLERATE
			SRC_STATE * src = node->data;
			src_delete (src);
#endif
		}
	}
	jack_slist_free (netj->capture_srcs);
	netj->playback_srcs = NULL;

	for (node = netj->playback_ports; node; node = jack_slist_next (node))
		jack_port_unregister (netj->client,
				      ((jack_port_t*)node->data));

	jack_slist_free (netj->playback_ports);
	netj->playback_ports = NULL;

	for (node = netj->playback_srcs; node; node = jack_slist_next (node)) {
#if HAVE_CELT
		if ( netj->bitdepth == CELT_MODE ) {
			CELTEncoder * encoder = node->data;
			celt_encoder_destroy (encoder);
		} else
#endif
		{
#if HAVE_SAMPLERATE
			SRC_STATE * src = node->data;
			src_delete (src);
#endif
		}
	}
	jack_slist_free (netj->playback_srcs);
	netj->playback_srcs = NULL;

#if HAVE_CELT
	if ( netj->bitdepth == CELT_MODE ) {
		celt_mode_destroy (netj->celt_mode);
	}
#endif
}


netjack_driver_state_t *netjack_init (netjack_driver_state_t *netj,
				      jack_client_t * client,
				      const char *name,
				      unsigned int capture_ports,
				      unsigned int playback_ports,
				      unsigned int capture_ports_midi,
				      unsigned int playback_ports_midi,
				      jack_nframes_t sample_rate,
				      jack_nframes_t period_size,
				      unsigned int listen_port,
				      unsigned int transport_sync,
				      unsigned int resample_factor,
				      unsigned int resample_factor_up,
				      unsigned int bitdepth,
				      unsigned int use_autoconfig,
				      unsigned int latency,
				      unsigned int redundancy,
				      int dont_htonl_floats,
				      int always_deadline,
				      int jitter_val )
{

	// Fill in netj values.
	// might be subject to autoconfig...
	// so dont calculate anything with them...


	netj->sample_rate = sample_rate;
	netj->period_size = period_size;
	netj->dont_htonl_floats = dont_htonl_floats;

	netj->listen_port   = listen_port;

	netj->capture_channels  = capture_ports + capture_ports_midi;
	netj->capture_channels_audio  = capture_ports;
	netj->capture_channels_midi   = capture_ports_midi;
	netj->capture_ports     = NULL;
	netj->playback_channels = playback_ports + playback_ports_midi;
	netj->playback_channels_audio = playback_ports;
	netj->playback_channels_midi = playback_ports_midi;
	netj->playback_ports    = NULL;
	netj->codec_latency = 0;

	netj->handle_transport_sync = transport_sync;
	netj->mtu = 1400;
	netj->latency = latency;
	netj->redundancy = redundancy;
	netj->use_autoconfig = use_autoconfig;
	netj->always_deadline = always_deadline;


	netj->client = client;


	if ((bitdepth != 0) && (bitdepth != 8) && (bitdepth != 16) && (bitdepth != CELT_MODE)) {
		jack_info ("Invalid bitdepth: %d (8, 16 or 0 for float) !!!", bitdepth);
		return NULL;
	}
	netj->bitdepth = bitdepth;


	if (resample_factor_up == 0) {
		resample_factor_up = resample_factor;
	}

	netj->resample_factor = resample_factor;
	netj->resample_factor_up = resample_factor_up;

	netj->jitter_val = jitter_val;

	return netj;
}

void netjack_release ( netjack_driver_state_t *netj )
{
	close ( netj->sockfd );
	close ( netj->outsockfd );

	packet_cache_free ( netj->packcache );
	netj->packcache = NULL;
}

int
netjack_startup ( netjack_driver_state_t *netj )
{
	int first_pack_len;
	struct sockaddr_in address;

	// Now open the socket, and wait for the first packet to arrive...
	netj->sockfd = socket (AF_INET, SOCK_DGRAM, 0);
#ifdef WIN32
	if (netj->sockfd == INVALID_SOCKET)
#else
	if (netj->sockfd == -1)
#endif
	{
		jack_info ("socket error");
		return -1;
	}
	address.sin_family = AF_INET;
	address.sin_port = htons (netj->listen_port);
	address.sin_addr.s_addr = htonl (INADDR_ANY);
	if (bind (netj->sockfd, (struct sockaddr*)&address, sizeof(address)) < 0) {
		jack_info ("bind error");
		return -1;
	}

	netj->outsockfd = socket (AF_INET, SOCK_DGRAM, 0);
#ifdef WIN32
	if (netj->outsockfd == INVALID_SOCKET)
#else
	if (netj->outsockfd == -1)
#endif
	{
		jack_info ("socket error");
		return -1;
	}
	netj->srcaddress_valid = 0;
	if (netj->use_autoconfig) {
		jacknet_packet_header *first_packet = alloca (sizeof(jacknet_packet_header));
#ifdef WIN32
		int address_size = sizeof( struct sockaddr_in );
#else
		socklen_t address_size = sizeof(struct sockaddr_in);
#endif
		//jack_info ("Waiting for an incoming packet !!!");
		//jack_info ("*** IMPORTANT *** Dont connect a client to jackd until the driver is attached to a clock source !!!");

		while (1) {
			if ( !netjack_poll ( netj->sockfd, 1000 ) ) {
				jack_info ("Waiting aborted");
				return -1;
			}
			first_pack_len = recvfrom (netj->sockfd, (char*)first_packet, sizeof(jacknet_packet_header), 0, (struct sockaddr*)&netj->syncsource_address, &address_size);
#ifdef WIN32
			if ( first_pack_len == -1 ) {
				first_pack_len = sizeof(jacknet_packet_header);
				break;
			}
#else
			if (first_pack_len == sizeof(jacknet_packet_header)) {
				break;
			}
#endif
		}
		netj->srcaddress_valid = 1;

		if (first_pack_len == sizeof(jacknet_packet_header)) {
			packet_header_ntoh (first_packet);

			jack_info ("AutoConfig Override !!!");
			if (netj->sample_rate != first_packet->sample_rate) {
				jack_info ("AutoConfig Override: Master JACK sample rate = %d", first_packet->sample_rate);
				netj->sample_rate = first_packet->sample_rate;
			}

			if (netj->period_size != first_packet->period_size) {
				jack_info ("AutoConfig Override: Master JACK period size is %d", first_packet->period_size);
				netj->period_size = first_packet->period_size;
			}
			if (netj->capture_channels_audio != first_packet->capture_channels_audio) {
				jack_info ("AutoConfig Override: capture_channels_audio = %d", first_packet->capture_channels_audio);
				netj->capture_channels_audio = first_packet->capture_channels_audio;
			}
			if (netj->capture_channels_midi != first_packet->capture_channels_midi) {
				jack_info ("AutoConfig Override: capture_channels_midi = %d", first_packet->capture_channels_midi);
				netj->capture_channels_midi = first_packet->capture_channels_midi;
			}
			if (netj->playback_channels_audio != first_packet->playback_channels_audio) {
				jack_info ("AutoConfig Override: playback_channels_audio = %d", first_packet->playback_channels_audio);
				netj->playback_channels_audio = first_packet->playback_channels_audio;
			}
			if (netj->playback_channels_midi != first_packet->playback_channels_midi) {
				jack_info ("AutoConfig Override: playback_channels_midi = %d", first_packet->playback_channels_midi);
				netj->playback_channels_midi = first_packet->playback_channels_midi;
			}

			netj->mtu = first_packet->mtu;
			jack_info ("MTU is set to %d bytes", first_packet->mtu);
			netj->latency = first_packet->latency;
		}
	}
	netj->capture_channels  = netj->capture_channels_audio + netj->capture_channels_midi;
	netj->playback_channels = netj->playback_channels_audio + netj->playback_channels_midi;

	if ( (netj->capture_channels * netj->period_size * netj->latency * 4) > 100000000 ) {
		jack_error ( "autoconfig requests more than 100MB packet cache... bailing out" );
		exit (1);
	}

	if ( netj->playback_channels > 1000 ) {
		jack_error ( "autoconfig requests more than 1000 playback channels... bailing out" );
		exit (1);
	}


	if ( netj->mtu < (2 * sizeof( jacknet_packet_header )) ) {
		jack_error ( "bullshit mtu requested by autoconfig" );
		exit (1);
	}

	if ( netj->sample_rate == 0 ) {
		jack_error ( "sample_rate 0 requested by autoconfig" );
		exit (1);
	}

	// After possible Autoconfig: do all calculations...
	netj->period_usecs =
		(jack_time_t)floor ((((float)netj->period_size) / (float)netj->sample_rate)
				    * 1000000.0f);

	if ( netj->latency == 0 ) {
		netj->deadline_offset = 50 * netj->period_usecs;
	} else {
		netj->deadline_offset = netj->period_usecs + 10 * netj->latency * netj->period_usecs / 100;
	}

	if ( netj->bitdepth == CELT_MODE ) {
		// celt mode.
		// TODO: this is a hack. But i dont want to change the packet header.
		netj->resample_factor = (netj->resample_factor * netj->period_size * 1024 / netj->sample_rate / 8) & (~1);
		netj->resample_factor_up = (netj->resample_factor_up * netj->period_size * 1024 / netj->sample_rate / 8) & (~1);

		netj->net_period_down = netj->resample_factor;
		netj->net_period_up = netj->resample_factor_up;
	} else {
		netj->net_period_down = (float)netj->period_size / (float)netj->resample_factor;
		netj->net_period_up = (float)netj->period_size / (float)netj->resample_factor_up;
	}

	netj->rx_bufsize = sizeof(jacknet_packet_header) + netj->net_period_down * netj->capture_channels * get_sample_size(netj->bitdepth);
	netj->packcache = packet_cache_new (netj->latency + 50, netj->rx_bufsize, netj->mtu);

	netj->expected_framecnt_valid = 0;
	netj->num_lost_packets = 0;
	netj->next_deadline_valid = 0;
	netj->deadline_goodness = 0;
	netj->time_to_deadline = 0;

	// Special handling for latency=0
	if ( netj->latency == 0 ) {
		netj->resync_threshold = 0;
	} else {
		netj->resync_threshold = MIN ( 15, netj->latency - 1 );
	}

	netj->running_free = 0;

	return 0;
}