/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            dv1394.cc
 *
 *  Tue Apr 19 12:10:34 CEST 2005
 *  Copyright  2005 Bent Bisballe
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *    This file is part of MIaV.
 *
 *    MIaV 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.
 *
 *    MIaV 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 MIaV; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include <config.h>
#include "dv1394.h"

#ifdef USE_GUI

#include "dv.h"


#include <stdlib.h>
#include <memory.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>



/**
 * Callback function for the firewire interface.
 */
static int raw_reader( raw1394handle_t handle, int channel, size_t length, quadlet_t *data )
{
	static char *framedata = NULL;

  // Only process packets with reasonable length.
	if ( length > 16 )
	{
		unsigned char * p = ( unsigned char* ) & data[ 3 ];
		int section_type = p[ 0 ] >> 5;           // section type is in bits 5 - 7
		int dif_sequence = p[ 1 ] >> 4;           // dif sequence number is in bits 4 - 7
		int dif_block = p[ 2 ];

		if ( section_type == 0 && dif_sequence == 0 )
		{
			if ( framedata != NULL )
			{
				raw1394_set_userdata(handle, (void *)framedata);
				framedata = NULL;
			}
		}

		if(!framedata)
		{
			framedata = (char *)malloc(DVPACKAGE_SIZE); // dvframe.h
			if(!framedata)
			{
				// We're fucked
        fprintf(stderr, "Framedata allocation error: %s.\n", strerror( errno ) ); fflush(stderr);
				exit(1);
			}
		}

		switch ( section_type )
		{
		case 0:    // 1 Header block
			// p[3] |= 0x80; // hack to force PAL data
			memcpy( framedata + dif_sequence * 150 * 80, p, 480 );
			break;

		case 1:    // 2 Subcode blocks
			memcpy( framedata + dif_sequence * 150 * 80 + ( 1 + dif_block ) * 80, p, 480 );
			break;

		case 2:    // 3 VAUX blocks
			memcpy( framedata + dif_sequence * 150 * 80 + ( 3 + dif_block ) * 80, p, 480 );
			break;

		case 3:    // 9 Audio blocks interleaved with video
			memcpy( framedata + dif_sequence * 150 * 80 + ( 6 + dif_block * 16 ) * 80, p, 480 );
			break;

		case 4:    // 135 Video blocks interleaved with audio
			memcpy( framedata + dif_sequence * 150 * 80 + ( 7 + ( dif_block / 15 ) + dif_block ) * 80, p, 480 );
			break;

		default:   // we can't handle any other data
			break;
		}
	}
	return 0;
}

dv1394::dv1394(Info *i, int p, int c)
{
  info = i;
  port = p;
  channel = c;
}

dv1394::~dv1394()
{
  // Close firewire connection.
  if(handle) raw1394_destroy_handle(handle);
}

bool dv1394::connect()
{
	int n_ports;
	struct raw1394_portinfo pinf[ 16 ];

  // Get handle to firewire channels
	handle = raw1394_new_handle();
	if(!handle) {
    info->error("raw1394 - failed to get handle: %s.", strerror( errno ) );
    return false;
	}

  // how many adapters are hooked in?
	if((n_ports = raw1394_get_port_info(handle, pinf, 16)) < 0 ) {
    info->error("raw1394 - failed to get port info: %s.", strerror( errno ) );
    raw1394_destroy_handle(handle);
    handle = NULL;
    return false;
	}

	// Tell raw1394 which host adapter to use
	if(raw1394_set_port(handle, port) < 0 ) {
    info->error("raw1394 - failed to set port: %s.", strerror( errno ) );
    raw1394_destroy_handle(handle);
    handle = NULL;
    return false;
	}

	raw1394_set_iso_handler( handle, channel, raw_reader);
	raw1394_set_userdata( handle, ( void* ) NULL);
  raw1394_start_iso_rcv( handle, channel);
  
  return true;
}

unsigned char *dv1394::readFrame()
{
  // Firewire port not correctly opened.
  if(!handle) return NULL;

  unsigned char *ptr;
  while(1) {
    raw1394_loop_iterate(handle);
    ptr = (unsigned char *)raw1394_get_userdata(handle);
    if(ptr) {
      raw1394_set_userdata(handle, NULL);
      break;
    }
  }
  return ptr;
}

#endif/*USE_GUI*/