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/* $Id: encac3.c,v 1.23 2005/10/13 23:47:06 titer Exp $
This file is part of the HandBrake source code.
Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
#include "hbffmpeg.h"
#include "downmix.h"
struct hb_work_private_s
{
hb_job_t * job;
AVCodecContext * context;
int out_discrete_channels;
unsigned long input_samples;
unsigned long output_bytes;
hb_list_t * list;
uint8_t * buf;
};
int encac3Init( hb_work_object_t *, hb_job_t * );
int encac3Work( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
void encac3Close( hb_work_object_t * );
#define AC3_SAMPLES_PER_FRAME 1536
#define AC3_MAX_CODED_FRAME_SIZE 3840
hb_work_object_t hb_encac3 =
{
WORK_ENCAC3,
"AC-3 encoder (libavcodec)",
encac3Init,
encac3Work,
encac3Close
};
int encac3Init( hb_work_object_t * w, hb_job_t * job )
{
AVCodec * codec;
AVCodecContext * context;
hb_audio_t * audio = w->audio;
hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
w->private_data = pv;
pv->job = job;
pv->out_discrete_channels = HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->config.out.mixdown);
pv->input_samples = AC3_SAMPLES_PER_FRAME * pv->out_discrete_channels;
pv->output_bytes = AC3_MAX_CODED_FRAME_SIZE;
pv->buf = malloc( pv->input_samples * sizeof( float ) );
codec = avcodec_find_encoder( CODEC_ID_AC3 );
if( !codec )
{
hb_log( "encac3Init: avcodec_find_encoder "
"failed" );
}
context = avcodec_alloc_context();
avcodec_get_context_defaults3(context, codec);
context->channel_layout = CH_LAYOUT_STEREO;
switch( audio->config.out.mixdown )
{
case HB_AMIXDOWN_MONO:
context->channel_layout = CH_LAYOUT_MONO;
break;
case HB_AMIXDOWN_STEREO:
case HB_AMIXDOWN_DOLBY:
case HB_AMIXDOWN_DOLBYPLII:
context->channel_layout = CH_LAYOUT_STEREO;
break;
case HB_AMIXDOWN_6CH:
context->channel_layout = CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY;
break;
default:
hb_log(" encac3Init: bad mixdown" );
break;
}
context->bit_rate = audio->config.out.bitrate * 1000;
context->sample_rate = audio->config.out.samplerate;
context->channels = pv->out_discrete_channels;
context->sample_fmt = AV_SAMPLE_FMT_FLT;
if( hb_avcodec_open( context, codec ) )
{
hb_log( "encac3Init: avcodec_open failed" );
}
pv->context = context;
pv->list = hb_list_init();
return 0;
}
/***********************************************************************
* Close
***********************************************************************
*
**********************************************************************/
void encac3Close( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
if ( pv )
{
if( pv->context )
{
hb_deep_log( 2, "encac3: closing libavcodec" );
if ( pv->context->codec )
avcodec_flush_buffers( pv->context );
hb_avcodec_close( pv->context );
}
if ( pv->buf )
{
free( pv->buf );
pv->buf = NULL;
}
if ( pv->list )
hb_list_empty( &pv->list );
free( pv );
w->private_data = NULL;
}
}
static hb_buffer_t * Encode( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
uint64_t pts, pos;
hb_audio_t * audio = w->audio;
hb_buffer_t * buf;
if( hb_list_bytes( pv->list ) < pv->input_samples * sizeof( float ) )
{
return NULL;
}
hb_list_getbytes( pv->list, pv->buf, pv->input_samples * sizeof( float ),
&pts, &pos);
hb_chan_map_t *map = NULL;
if ( audio->config.in.codec == HB_ACODEC_AC3 )
{
map = &hb_ac3_chan_map;
}
else if ( audio->config.in.codec == HB_ACODEC_DCA )
{
map = &hb_qt_chan_map;
}
if ( map )
{
int layout;
switch (audio->config.out.mixdown)
{
case HB_AMIXDOWN_MONO:
layout = HB_INPUT_CH_LAYOUT_MONO;
break;
case HB_AMIXDOWN_STEREO:
case HB_AMIXDOWN_DOLBY:
case HB_AMIXDOWN_DOLBYPLII:
layout = HB_INPUT_CH_LAYOUT_STEREO;
break;
case HB_AMIXDOWN_6CH:
default:
layout = HB_INPUT_CH_LAYOUT_3F2R | HB_INPUT_CH_LAYOUT_HAS_LFE;
break;
}
hb_layout_remap( map, &hb_smpte_chan_map, layout,
(float*)pv->buf, AC3_SAMPLES_PER_FRAME);
}
buf = hb_buffer_init( pv->output_bytes );
buf->size = avcodec_encode_audio( pv->context, buf->data, buf->alloc,
(short*)pv->buf );
buf->start = pts + 90000 * pos / pv->out_discrete_channels / sizeof( float ) / audio->config.out.samplerate;
buf->stop = buf->start + 90000 * AC3_SAMPLES_PER_FRAME / audio->config.out.samplerate;
buf->frametype = HB_FRAME_AUDIO;
if ( !buf->size )
{
hb_buffer_close( &buf );
return Encode( w );
}
else if (buf->size < 0)
{
hb_log( "encac3: avcodec_encode_audio failed" );
hb_buffer_close( &buf );
return NULL;
}
return buf;
}
/***********************************************************************
* Work
***********************************************************************
*
**********************************************************************/
int encac3Work( 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 * in = *buf_in, * buf;
if ( in->size <= 0 )
{
/* EOF on input - send it downstream & say we're done */
*buf_out = in;
*buf_in = NULL;
return HB_WORK_DONE;
}
if ( pv->context == NULL || pv->context->codec == NULL )
{
// No encoder context. Nothing we can do.
return HB_WORK_OK;
}
hb_list_add( pv->list, in );
*buf_in = NULL;
*buf_out = buf = Encode( w );
while ( buf )
{
buf->next = Encode( w );
buf = buf->next;
}
return HB_WORK_OK;
}
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