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/* -*- 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.
*/
/*
* $Id$
*/
/*
* $Log$
* Revision 1.7 2005/05/03 08:31:59 deva
* Removed the error object, and replaced it with a more generic info object.
*
* Revision 1.6 2005/05/01 09:56:26 deva
* Added Id and Log tags to all files
*/
#include <config.h>
#include "dv1394.h"
#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 *ginfo, int port, int channel)
{
info = ginfo;
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;
}
// 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;
}
// 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;
}
raw1394_set_iso_handler( handle, channel, raw_reader);
raw1394_set_userdata( handle, ( void* ) NULL);
raw1394_start_iso_rcv( handle, channel);
}
dv1394::~dv1394()
{
// Close firewire connection.
if(handle) raw1394_destroy_handle(handle);
}
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;
}
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