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/* $Id: LpcmDec.c,v 1.10 2004/05/10 16:50:32 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"
struct HBWork
{
HB_WORK_COMMON_MEMBERS
HBHandle * handle;
HBAudio * audio;
int initDone;
};
/* Local prototypes */
static int LpcmDecWork( HBWork * );
HBWork * HBLpcmDecInit( HBHandle * handle, HBAudio * audio )
{
HBWork * w;
if( !( w = calloc( sizeof( HBWork ), 1 ) ) )
{
HBLog( "HBLpcmDecInit: malloc() failed, gonna crash" );
return NULL;
}
w->name = strdup( "LpcmDec" );
w->work = LpcmDecWork;
w->handle = handle;
w->audio = audio;
return w;
}
void HBLpcmDecClose( HBWork ** _w )
{
HBWork * w = *_w;
free( w->name );
free( w );
*_w = NULL;
}
static int LpcmDecWork( HBWork * w )
{
HBAudio * audio = w->audio;
HBBuffer * lpcmBuffer;
HBBuffer * rawBuffer;
uint8_t * samples_u8;
float * samples_f;
int samples_nr, i;
if( HBFifoIsHalfFull( audio->rawFifo ) )
{
return 0;
}
/* Get a new LPCM buffer */
lpcmBuffer = HBFifoPop( audio->inFifo );
if( !lpcmBuffer )
{
return 0;
}
if( !w->initDone )
{
/* SampleRate */
switch( ( lpcmBuffer->data[4] >> 4 ) & 0x3 )
{
case 0:
audio->inSampleRate = 48000;
break;
case 1:
audio->inSampleRate = 32000;
break;
default:
HBLog( "HBLpcmDec: unknown samplerate (%d)",
( lpcmBuffer->data[4] >> 4 ) & 0x3 );
}
/* We hope there are 2 channels */
HBLog( "HBLpcmDec: samplerate: %d Hz, channels: %d",
audio->inSampleRate, ( lpcmBuffer->data[4] & 0x7 ) + 1 );
w->initDone = 1;
}
if( lpcmBuffer->data[5] != 0x80 )
{
HBLog( "HBLpcmDec: no frame sync (%02x)", lpcmBuffer->data[5] );
}
/* Allocate raw buffer */
samples_nr = ( lpcmBuffer->size - 6 ) / sizeof( int16_t );
rawBuffer = HBBufferInit( samples_nr * sizeof( float ) );
rawBuffer->position = lpcmBuffer->position;
/* Big endian int16 -> float conversion (happy casting) */
samples_u8 = lpcmBuffer->data + 6;
samples_f = rawBuffer->dataf;
for( i = 0; i < samples_nr; i++ )
{
samples_f[0] = (float) (int16_t)
( ( ( (uint16_t) samples_u8[0] ) << 8 ) +
(uint16_t) samples_u8[1] );
samples_u8 += 2;
samples_f += 1;
}
HBBufferClose( &lpcmBuffer );
if( !HBFifoPush( audio->rawFifo, &rawBuffer ) )
{
HBLog( "HBLpcmDec: HBFifoPush failed" );
}
return 1;
}
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