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/* $Id: LpcmDec.c,v 1.1 2004/03/08 11:32:48 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"
typedef struct HBLpcmDec
{
HB_WORK_COMMON_MEMBERS
HBHandle * handle;
HBAudio * audio;
int initDone;
int channels;
float sampleLevel;
HBBuffer * rawBuffer;
} HBLpcmDec;
/* Local prototypes */
static int LpcmDecWork( HBWork * );
HBWork * HBLpcmDecInit( HBHandle * handle, HBAudio * audio )
{
HBLpcmDec * l;
if( !( l = calloc( sizeof( HBLpcmDec ), 1 ) ) )
{
HBLog( "HBLpcmDecInit: malloc() failed, gonna crash" );
return NULL;
}
l->name = strdup( "LpcmDec" );
l->work = LpcmDecWork;
l->handle = handle;
l->audio = audio;
if( audio->outCodec & ( HB_CODEC_MP3 | HB_CODEC_VORBIS ) )
{
/* 16 bits samples */
l->sampleLevel = 1.0;
}
else if( audio->outCodec & HB_CODEC_AAC )
{
/* 24 bits samples */
l->sampleLevel = 256.0;
}
return (HBWork*) l;
}
void HBLpcmDecClose( HBWork ** _l )
{
HBLpcmDec * l = (HBLpcmDec*) *_l;
/* Clean up */
if( l->rawBuffer )
{
HBBufferClose( &l->rawBuffer );
}
free( l->name );
free( l );
*_l = NULL;
}
static int LpcmDecWork( HBWork * w )
{
HBLpcmDec * l = (HBLpcmDec*) w;
HBAudio * audio = l->audio;
HBBuffer * lpcmBuffer;
int16_t * int16data;
int i;
int samples;
int didSomething = 0;
/* Push decoded buffer */
if( l->rawBuffer )
{
if( HBFifoPush( audio->rawFifo, &l->rawBuffer ) )
{
didSomething = 1;
}
else
{
return 0;
}
}
/* Get a new LPCM buffer */
lpcmBuffer = HBFifoPop( audio->inFifo );
if( !lpcmBuffer )
{
return didSomething;
}
if( !l->initDone )
{
/* SampleRate */
switch( ( lpcmBuffer->data[4] >> 4 ) & 0x3 )
{
case 0:
audio->inSampleRate = 48000;
break;
case 1:
audio->inSampleRate = 32000;
break;
default:
HBLog( "LpcmDec: unknown samplerate (%d)",
( lpcmBuffer->data[4] >> 4 ) & 0x3 );
}
HBLog( "LpcmDec: samplerate = %d Hz", audio->inSampleRate );
/* Channels */
HBLog( "LpcmDec: %d channels",
( lpcmBuffer->data[4] & 0x7 ) + 1 );
l->initDone = 1;
}
if( lpcmBuffer->data[5] != 0x80 )
{
HBLog( "LpcmDec: no frame synx (%02x�", lpcmBuffer->data[5] );
}
samples = ( lpcmBuffer->size - 6 ) / sizeof( int16_t ) / 2;
int16data = (int16_t*) ( lpcmBuffer->data + 6 );
l->rawBuffer = HBBufferInit( samples * sizeof( float ) * 2 );
l->rawBuffer->left = (float*) l->rawBuffer->data;
l->rawBuffer->right = l->rawBuffer->left + samples;
l->rawBuffer->position = lpcmBuffer->position;
l->rawBuffer->samples = samples;
for( i = 0; i < samples; i++ )
{
l->rawBuffer->left[i] = (float) int16data[2*i] * l->sampleLevel;
l->rawBuffer->right[i] = (float) int16data[2*i+1] * l->sampleLevel;
}
HBBufferClose( &lpcmBuffer );
return 1;
}
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