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/* $Id: declpcm.c,v 1.8 2005/11/04 14:44:01 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 "hb.h"
int declpcmInit( hb_work_object_t *, hb_job_t * );
int declpcmWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
void declpcmClose( hb_work_object_t * );
hb_work_object_t hb_declpcm =
{
WORK_DECLPCM,
"LPCM decoder",
declpcmInit,
declpcmWork,
declpcmClose
};
int declpcmInit( hb_work_object_t * w, hb_job_t * job )
{
return 0;
}
int declpcmWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_buffer_t * in = *buf_in, * out;
int samplerate = 0;
int count;
uint8_t * samples_u8;
float * samples_fl32;
int i;
uint64_t duration;
*buf_out = NULL;
if( in->data[5] != 0x80 )
{
hb_log( "no LPCM frame sync (%02x)", in->data[5] );
return HB_WORK_OK;
}
switch( ( in->data[4] >> 4 ) & 0x3 )
{
case 0:
samplerate = 48000;
break;
case 1:
samplerate = 96000;//32000; /* FIXME vlc says it is 96000 */
break;
case 2:
samplerate = 44100;
break;
case 3:
samplerate = 32000;
break;
}
count = ( in->size - 6 ) / 2;
out = hb_buffer_init( count * sizeof( float ) );
duration = count * 90000 / samplerate / 2;
out->start = in->start;
out->stop = out->start + duration;
samples_u8 = in->data + 6;
samples_fl32 = (float *) out->data;
/* Big endian int16 -> float conversion */
for( i = 0; i < count; i++ )
{
#ifdef WORDS_BIGENDIAN
samples_fl32[0] = *( (int16_t *) samples_u8 );
#else
samples_fl32[0] = (int16_t) ( ( samples_u8[0] << 8 ) | samples_u8[1] );
#endif
samples_u8 += 2;
samples_fl32 += 1;
}
*buf_out = out;
return HB_WORK_OK;
}
void declpcmClose( hb_work_object_t * w )
{
}
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