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/* $Id: decdca.c,v 1.14 2005/03/03 17:21:57 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"
#include "dca.h"
struct hb_work_private_s
{
hb_job_t * job;
/* libdca handle */
dca_state_t * state;
int flags_in;
int flags_out;
int rate;
int bitrate;
int frame_length;
float level;
int error;
int sync;
int size;
/* max frame size of the 16 bits version is 16384 */
/* max frame size of the 14 bits version is 18726 */
uint8_t frame[18726];
hb_list_t * list;
int out_discrete_channels;
};
int decdcaInit( hb_work_object_t *, hb_job_t * );
int decdcaWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
void decdcaClose( hb_work_object_t * );
hb_work_object_t hb_decdca =
{
WORK_DECDCA,
"DCA decoder",
decdcaInit,
decdcaWork,
decdcaClose
};
/***********************************************************************
* Local prototypes
**********************************************************************/
static hb_buffer_t * Decode( hb_work_object_t * w );
/***********************************************************************
* hb_work_decdca_init
***********************************************************************
* Allocate the work object, initialize libdca
**********************************************************************/
int decdcaInit( hb_work_object_t * w, hb_job_t * job )
{
hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
hb_audio_t * audio = w->audio;
w->private_data = pv;
pv->job = job;
pv->list = hb_list_init();
pv->state = dca_init( 0 );
/* Decide what format we want out of libdca
work.c has already done some of this deduction for us in do_job() */
pv->flags_out = HB_AMIXDOWN_GET_DCA_FORMAT(audio->config.out.mixdown);
/* pass the number of channels used into the private work data */
/* will only be actually used if we're not doing AC3 passthru */
pv->out_discrete_channels = HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->config.out.mixdown);
pv->level = 32768.0;
return 0;
}
/***********************************************************************
* Close
***********************************************************************
* Free memory
**********************************************************************/
void decdcaClose( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
dca_free( pv->state );
hb_list_empty( &pv->list );
free( pv );
w->private_data = NULL;
}
/***********************************************************************
* Work
***********************************************************************
* Add the given buffer to the data we already have, and decode as much
* as we can
**********************************************************************/
int decdcaWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_work_private_t * pv = w->private_data;
hb_buffer_t * buf;
hb_list_add( pv->list, *buf_in );
*buf_in = NULL;
/* If we got more than a frame, chain raw buffers */
*buf_out = buf = Decode( w );
while( buf )
{
buf->next = Decode( w );
buf = buf->next;
}
return HB_WORK_OK;
}
/***********************************************************************
* Decode
***********************************************************************
*
**********************************************************************/
static hb_buffer_t * Decode( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
hb_buffer_t * buf;
int i, j, k;
uint64_t pts, pos;
int num_blocks;
/* Get a frame header if don't have one yet */
if( !pv->sync )
{
while( hb_list_bytes( pv->list ) >= 14 )
{
/* We have 14 bytes, check if this is a correct header */
hb_list_seebytes( pv->list, pv->frame, 14 );
pv->size = dca_syncinfo( pv->state, pv->frame, &pv->flags_in, &pv->rate,
&pv->bitrate, &pv->frame_length );
if( pv->size )
{
/* It is. W00t. */
if( pv->error )
{
hb_log( "dca_syncinfo ok" );
}
pv->error = 0;
pv->sync = 1;
break;
}
/* It is not */
if( !pv->error )
{
hb_log( "dca_syncinfo failed" );
pv->error = 1;
}
/* Try one byte later */
hb_list_getbytes( pv->list, pv->frame, 1, NULL, NULL );
}
}
if( !pv->sync ||
hb_list_bytes( pv->list ) < pv->size )
{
/* Need more data */
return NULL;
}
/* Get the whole frame */
hb_list_getbytes( pv->list, pv->frame, pv->size, &pts, &pos );
/* Feed libdca */
dca_frame( pv->state, pv->frame, &pv->flags_out, &pv->level, 0 );
/* find out how many blocks are in this frame */
num_blocks = dca_blocks_num( pv->state );
/* num_blocks blocks per frame, 256 samples per block, channelsused channels */
buf = hb_buffer_init( num_blocks * 256 * pv->out_discrete_channels * sizeof( float ) );
buf->start = pts + ( pos / pv->size ) * num_blocks * 256 * 90000 / pv->rate;
buf->stop = buf->start + num_blocks * 256 * 90000 / pv->rate;
for( i = 0; i < num_blocks; i++ )
{
dca_sample_t * samples_in;
float * samples_out;
dca_block( pv->state );
samples_in = dca_samples( pv->state );
samples_out = ((float *) buf->data) + 256 * pv->out_discrete_channels * i;
/* Interleave */
for( j = 0; j < 256; j++ )
{
for ( k = 0; k < pv->out_discrete_channels; k++ )
{
samples_out[(pv->out_discrete_channels*j)+k] = samples_in[(256*k)+j] * 16384;
}
}
}
pv->sync = 0;
return buf;
}
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