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/* $Id: decavcodec.c,v 1.6 2005/03/06 04:08:54 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 "ffmpeg/avcodec.h"
int decavcodecInit( hb_work_object_t *, hb_job_t * );
int decavcodecWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
void decavcodecClose( hb_work_object_t * );
hb_work_object_t hb_decavcodec =
{
WORK_DECAVCODEC,
"MPGA decoder (libavcodec)",
decavcodecInit,
decavcodecWork,
decavcodecClose
};
struct hb_work_private_s
{
hb_job_t * job;
AVCodecContext * context;
int64_t pts_last;
AVCodecParserContext *parser;
};
/***********************************************************************
* hb_work_decavcodec_init
***********************************************************************
*
**********************************************************************/
int decavcodecInit( hb_work_object_t * w, hb_job_t * job )
{
AVCodec * codec;
hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
w->private_data = pv;
pv->job = job;
codec = avcodec_find_decoder( CODEC_ID_MP2 );
pv->parser = av_parser_init(CODEC_ID_MP2);
pv->context = avcodec_alloc_context();
avcodec_open( pv->context, codec );
pv->pts_last = -1;
return 0;
}
/***********************************************************************
* Close
***********************************************************************
*
**********************************************************************/
void decavcodecClose( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
av_parser_close(pv->parser);
avcodec_close( pv->context );
}
/***********************************************************************
* Work
***********************************************************************
*
**********************************************************************/
int decavcodecWork( 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, * last = NULL;
int pos, len, out_size, i, uncompressed_len;
short buffer[AVCODEC_MAX_AUDIO_FRAME_SIZE];
uint64_t cur;
unsigned char *parser_output_buffer;
int parser_output_buffer_len;
*buf_out = NULL;
if( in->start < 0 ||
( pv->pts_last > 0 &&
in->start > pv->pts_last &&
in->start - pv->pts_last < 5000 ) ) /* Hacky */
{
cur = pv->pts_last;
}
else
{
cur = in->start;
}
pos = 0;
while( pos < in->size )
{
len = av_parser_parse(pv->parser, pv->context,&parser_output_buffer,&parser_output_buffer_len,in->data + pos,in->size - pos,cur,cur);
out_size = 0;
uncompressed_len = 0;
if (parser_output_buffer_len)
uncompressed_len = avcodec_decode_audio( pv->context, buffer, &out_size,
parser_output_buffer, parser_output_buffer_len );
if( out_size )
{
short * s16;
float * fl32;
buf = hb_buffer_init( 2 * out_size );
int sample_size_in_bytes = 2; // Default to 2 bytes
switch (pv->context->sample_fmt)
{
case SAMPLE_FMT_S16:
sample_size_in_bytes = 2;
break;
/* We should handle other formats here - but that needs additional format conversion work below */
/* For now we'll just report the error and try to carry on */
default:
hb_log("decavcodecWork - Unknown Sample Format from avcodec_decode_audio (%d) !", pv->context->sample_fmt);
break;
}
buf->start = cur;
buf->stop = cur + 90000 * ( out_size / (sample_size_in_bytes * pv->context->channels) ) /
pv->context->sample_rate;
cur = buf->stop;
s16 = buffer;
fl32 = (float *) buf->data;
for( i = 0; i < out_size / 2; i++ )
{
fl32[i] = s16[i];
}
if( last )
{
last = last->next = buf;
}
else
{
*buf_out = last = buf;
}
}
pos += len;
}
pv->pts_last = cur;
return HB_WORK_OK;
}
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