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/* $Id: encavcodec.c,v 1.23 2005/10/13 23:47:06 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"
struct hb_work_private_s
{
hb_job_t * job;
AVCodecContext * context;
FILE * file;
};
int encavcodecInit( hb_work_object_t *, hb_job_t * );
int encavcodecWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
void encavcodecClose( hb_work_object_t * );
hb_work_object_t hb_encavcodec =
{
WORK_ENCAVCODEC,
"MPEG-4 encoder (libavcodec)",
encavcodecInit,
encavcodecWork,
encavcodecClose
};
int encavcodecInit( hb_work_object_t * w, hb_job_t * job )
{
AVCodec * codec;
AVCodecContext * context;
hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
w->private_data = pv;
pv->job = job;
codec = avcodec_find_encoder( CODEC_ID_MPEG4 );
if( !codec )
{
hb_log( "hb_work_encavcodec_init: avcodec_find_encoder "
"failed" );
}
context = avcodec_alloc_context();
if( job->vquality < 0.0 || job->vquality > 1.0 )
{
/* Rate control */
context->bit_rate = 1000 * job->vbitrate;
context->bit_rate_tolerance = 10 * context->bit_rate;
}
else
{
/* Constant quantizer */
context->qmin = 31 - job->vquality * 30;
context->qmax = context->qmin;
hb_log( "encavcodec: encoding at constant quantizer %d",
context->qmin );
}
context->width = job->width;
context->height = job->height;
context->time_base = (AVRational) { job->vrate_base, job->vrate };
context->gop_size = 10 * job->vrate / job->vrate_base;
context->pix_fmt = PIX_FMT_YUV420P;
if( job->pixel_ratio )
{
context->sample_aspect_ratio.num = job->pixel_aspect_width;
context->sample_aspect_ratio.den = job->pixel_aspect_height;
hb_log( "encavcodec: encoding with stored aspect %d/%d",
job->pixel_aspect_width, job->pixel_aspect_height );
}
if( job->mux & ( HB_MUX_MP4 | HB_MUX_PSP ) )
{
context->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
if( job->mux & HB_MUX_PSP )
{
context->flags |= CODEC_FLAG_BITEXACT;
}
if( job->grayscale )
{
context->flags |= CODEC_FLAG_GRAY;
}
if( job->pass )
{
char filename[1024]; memset( filename, 0, 1024 );
hb_get_tempory_filename( job->h, filename, "ffmpeg.log" );
if( job->pass == 1 )
{
pv->file = fopen( filename, "wb" );
context->flags |= CODEC_FLAG_PASS1;
}
else
{
int size;
char * log;
pv->file = fopen( filename, "rb" );
fseek( pv->file, 0, SEEK_END );
size = ftell( pv->file );
fseek( pv->file, 0, SEEK_SET );
log = malloc( size + 1 );
log[size] = '\0';
fread( log, size, 1, pv->file );
fclose( pv->file );
pv->file = NULL;
context->flags |= CODEC_FLAG_PASS2;
context->stats_in = log;
}
}
if( avcodec_open( context, codec ) )
{
hb_log( "hb_work_encavcodec_init: avcodec_open failed" );
}
pv->context = context;
if( ( job->mux & ( HB_MUX_MP4 | HB_MUX_PSP ) ) && job->pass != 1 )
{
#if 0
/* Hem hem */
w->config->mpeg4.length = 15;
memcpy( w->config->mpeg4.bytes, context->extradata + 15, 15 );
#else
w->config->mpeg4.length = context->extradata_size;
memcpy( w->config->mpeg4.bytes, context->extradata,
context->extradata_size );
#endif
}
return 0;
}
/***********************************************************************
* Close
***********************************************************************
*
**********************************************************************/
void encavcodecClose( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
if( pv->context )
{
hb_log( "encavcodec: closing libavcodec" );
avcodec_close( pv->context );
}
if( pv->file )
{
fclose( pv->file );
}
}
/***********************************************************************
* Work
***********************************************************************
*
**********************************************************************/
int encavcodecWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_work_private_t * pv = w->private_data;
hb_job_t * job = pv->job;
AVFrame * frame;
hb_buffer_t * in = *buf_in, * buf;
frame = avcodec_alloc_frame();
frame->data[0] = in->data;
frame->data[1] = frame->data[0] + job->width * job->height;
frame->data[2] = frame->data[1] + job->width * job->height / 4;
frame->linesize[0] = job->width;
frame->linesize[1] = job->width / 2;
frame->linesize[2] = job->width / 2;
/* Should be way too large */
buf = hb_buffer_init( 3 * job->width * job->height / 2 );
buf->size = avcodec_encode_video( pv->context, buf->data, buf->alloc,
frame );
buf->start = in->start;
buf->stop = in->stop;
buf->key = pv->context->coded_frame->key_frame;
av_free( frame );
if( job->pass == 1 )
{
/* Write stats */
fprintf( pv->file, "%s", pv->context->stats_out );
}
*buf_out = buf;
return HB_WORK_OK;
}
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