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/* $Id: HBMpegDemux.cpp,v 1.13 2003/08/24 19:28:18 titer Exp $ */
#include "HBCommon.h"
#include "HBManager.h"
#include "HBMpegDemux.h"
#include "HBFifo.h"
extern "C" {
#include <a52dec/a52.h>
}
HBMpegDemux::HBMpegDemux( HBManager * manager, HBTitleInfo * titleInfo,
HBAudioInfo * audio1Info, HBAudioInfo * audio2Info )
: HBThread( "mpegdemux" )
{
fManager = manager;
fTitleInfo = titleInfo;
fAudio1Info = audio1Info;
fAudio2Info = audio2Info;
fPSBuffer = NULL;
fESBuffer = NULL;
fESBufferList = NULL;
fFirstVideoPTS = -1;
fFirstAudio1PTS = -1;
fFirstAudio2PTS = -1;
}
void HBMpegDemux::DoWork()
{
while( !fDie )
{
/* Get a PS packet */
fPSBuffer = fTitleInfo->fPSFifo->Pop();
if( !fPSBuffer )
{
continue;
}
/* Get the ES data in it */
fESBufferList = PStoES( fPSBuffer );
if( !fESBufferList )
{
continue;
}
while( ( fESBuffer = (HBBuffer*) fESBufferList->ItemAt( 0 ) ) )
{
fESBufferList->RemoveItem( fESBuffer );
/* Look for a decoder for this ES */
if( fESBuffer->fStreamId == 0xE0 )
{
if( fFirstVideoPTS < 0 )
{
fFirstVideoPTS = fESBuffer->fPTS;
}
fTitleInfo->fMpeg2Fifo->Push( fESBuffer );
}
else if( fESBuffer->fStreamId == fAudio1Info->fId )
{
/* If the audio track starts later than the video,
repeat the first frame as long as needed */
if( fFirstAudio1PTS < 0 )
{
fFirstAudio1PTS = fESBuffer->fPTS;
if( fFirstAudio1PTS > fFirstVideoPTS )
{
Log( "HBMpegDemux::DoWork() : audio track %x is late",
fAudio1Info->fId );
InsertSilence( fFirstAudio1PTS - fFirstVideoPTS,
fAudio1Info->fAc3Fifo,
fESBuffer );
}
}
fAudio1Info->fAc3Fifo->Push( fESBuffer );
}
else if( fESBuffer->fStreamId == fAudio2Info->fId )
{
if( fFirstAudio2PTS < 0 )
{
fFirstAudio2PTS = fESBuffer->fPTS;
if( fFirstAudio2PTS > fFirstVideoPTS )
{
Log( "HBMpegDemux::DoWork() : audio track %x is late",
fAudio2Info->fId );
InsertSilence( fFirstAudio2PTS - fFirstVideoPTS,
fAudio2Info->fAc3Fifo,
fESBuffer );
}
}
fAudio2Info->fAc3Fifo->Push( fESBuffer );
}
else
{
delete fESBuffer;
}
}
delete fESBufferList;
}
}
void HBMpegDemux::InsertSilence( int64_t time, HBFifo * fifo,
HBBuffer * buffer )
{
int flags = 0;
int sampleRate = 0;
int bitrate = 0;
int frameSize = a52_syncinfo( buffer->fData, &flags,
&sampleRate, &bitrate );
if( !frameSize )
{
Log( "HBMpegDemux::InsertSilence() : a52_syncinfo() failed" );
return;
}
uint32_t samples = sampleRate * time / 90000;
HBBuffer * buffer2;
Log( "HBMpegDemux::InsertSilence() : adding %d samples", samples );
for( uint32_t i = 0; i < samples / ( 6 * 256 ); i++ )
{
buffer2 = new HBBuffer( frameSize );
memcpy( buffer2->fData, buffer->fData, frameSize );
fifo->Push( buffer2 );
}
}
BList * PStoES( HBBuffer * psBuffer )
{
#define psData (psBuffer->fData)
BList * esBufferList = new BList();
HBBuffer * esBuffer;
uint32_t pos = 0;
/* pack_header */
if( psData[pos] != 0 || psData[pos+1] != 0 ||
psData[pos+2] != 0x1 || psData[pos+3] != 0xBA )
{
Log( "PStoES : not a PS packet (%02x%02x%02x%02x)",
psData[pos] << 24, psData[pos+1] << 16,
psData[pos+2] << 8, psData[pos+3] );
delete psBuffer;
return NULL;
}
pos += 4; /* pack_start_code */
pos += 9; /* pack_header */
pos += 1 + ( psData[pos] & 0x7 ); /* stuffing bytes */
/* system_header */
if( psData[pos] == 0 && psData[pos+1] == 0 &&
psData[pos+2] == 0x1 && psData[pos+3] == 0xBB )
{
uint32_t header_length;
pos += 4; /* system_header_start_code */
header_length = ( psData[pos] << 8 ) + psData[pos+1];
pos += 2 + header_length;
}
/* PES */
while( pos + 2 < psBuffer->fSize &&
psData[pos] == 0 && psData[pos+1] == 0 && psData[pos+2] == 0x1 )
{
uint32_t streamId;
uint32_t PES_packet_length;
uint32_t PES_packet_end;
uint32_t PES_header_data_length;
uint32_t PES_header_end;
bool hasPTS;
uint64_t PTS = 0;
pos += 3; /* packet_start_code_prefix */
streamId = psData[pos++];
PES_packet_length = ( psData[pos] << 8 ) + psData[pos+1];
pos += 2; /* PES_packet_length */
PES_packet_end = pos + PES_packet_length;
hasPTS = ( ( psData[pos+1] >> 6 ) & 0x2 );
pos += 2; /* Required headers */
PES_header_data_length = psData[pos];
pos += 1;
PES_header_end = pos + PES_header_data_length;
if( hasPTS )
{
PTS = ( ( ( psData[pos] >> 1 ) & 0x7 ) << 30 ) +
( psData[pos+1] << 22 ) +
( ( psData[pos+2] >> 1 ) << 15 ) +
( psData[pos+3] << 7 ) +
( psData[pos+4] >> 1 );
}
pos = PES_header_end;
if( streamId != 0xE0 && streamId != 0xBD )
{
/* Not interesting */
continue;
}
if( streamId == 0xBD )
{
/* A52 : don't ask */
streamId |= ( psData[pos] << 8 );
pos += 4;
}
/* Here we hit we ES payload */
esBuffer = new HBBuffer( PES_packet_end - pos );
esBuffer->fPosition = psBuffer->fPosition;
esBuffer->fStreamId = streamId;
esBuffer->fPTS = PTS;
memcpy( esBuffer->fData, psBuffer->fData + pos,
PES_packet_end - pos );
esBufferList->AddItem( esBuffer );
pos = PES_packet_end;
}
delete psBuffer;
if( esBufferList && !esBufferList->CountItems() )
{
delete esBufferList;
return NULL;
}
return esBufferList;
#undef psData
}
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