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/* $Id: MpgaDec.c,v 1.3 2004/05/02 16:25:00 titer Exp $
This file is part of the HandBrake source code.
Homepage: <http://handbrake.m0k.org/>.
It may be used under the terms of the GNU General Public License. */
#include "HBInternal.h"
#include "ffmpeg/avcodec.h"
struct HBWork
{
HB_WORK_COMMON_MEMBERS
HBHandle * handle;
HBAudio * audio;
AVCodecContext * context;
};
/* Local prototypes */
static int MpgaDecWork( HBWork * );
HBWork * HBMpgaDecInit( HBHandle * handle, HBAudio * audio )
{
HBWork * w;
AVCodec * codec;
if( !( w = calloc( sizeof( HBWork ), 1 ) ) )
{
HBLog( "HBMpgaDecInit: malloc() failed, gonna crash" );
return NULL;
}
w->name = strdup( "MpgaDec" );
w->work = MpgaDecWork;
w->handle = handle;
w->audio = audio;
codec = avcodec_find_decoder( CODEC_ID_MP2 );
if( !codec )
{
HBLog( "HBMpgaDec: avcodec_find_decoder failed" );
}
w->context = avcodec_alloc_context();
if( !w->context )
{
HBLog( "HBMpgaDec: avcodec_alloc_context failed" );
}
if( avcodec_open( w->context, codec ) < 0 )
{
HBLog( "HBMpgaDec: avcodec_open failed" );
}
return w;
}
void HBMpgaDecClose( HBWork ** _w )
{
HBWork * w = *_w;
avcodec_close( w->context );
free( w->name );
free( w );
*_w = NULL;
}
static int MpgaDecWork( HBWork * w )
{
HBAudio * audio = w->audio;
HBBuffer * mpgaBuffer;
HBBuffer * rawBuffer;
int out_size, len, pos;
short buffer[AVCODEC_MAX_AUDIO_FRAME_SIZE];
if( HBFifoIsHalfFull( audio->rawFifo ) )
{
return 0;
}
/* Get a new mpeg buffer */
mpgaBuffer = HBFifoPop( audio->inFifo );
if( !mpgaBuffer )
{
return 0;
}
pos = 0;
while( pos < mpgaBuffer->size )
{
len = avcodec_decode_audio( w->context, buffer, &out_size,
mpgaBuffer->data + pos,
mpgaBuffer->size - pos );
pos += len;
if( !audio->inSampleRate )
{
audio->inSampleRate = w->context->sample_rate;
HBLog( "HBMpgaDec: samplerate = %d", audio->inSampleRate );
}
if( out_size )
{
int i;
rawBuffer = HBBufferInit( 2 * AVCODEC_MAX_AUDIO_FRAME_SIZE );
rawBuffer->position = mpgaBuffer->position;
/* s16 -> float */
for( i = 0; i < out_size / 2; i++ )
{
rawBuffer->dataf[i] = buffer[i];
}
rawBuffer->size = out_size * 2;
if( !HBFifoPush( audio->rawFifo, &rawBuffer ) )
{
HBLog( "HBMpgaDec: HBFifoPush failed" );
}
}
}
HBBufferClose( &mpgaBuffer );
return 1;
}
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