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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.fr/>.
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
#include "hbffmpeg.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;
int rate_num, rate_den;
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 )
{
/* Rate control */
context->bit_rate = 1000 * job->vbitrate;
context->bit_rate_tolerance = 10 * context->bit_rate;
}
else
{
/* Constant quantizer */
// These settings produce better image quality than
// what was previously used
context->flags |= CODEC_FLAG_QSCALE;
if (job->vquality < 1.0)
{
float vquality;
vquality = 31 - job->vquality * 31;
// A value of 0 has undefined behavior
// and ffmpeg qp has integral increments
if (vquality < 1.0)
vquality = 1.0;
context->global_quality = FF_QP2LAMBDA * vquality + 0.5;
}
else
{
context->global_quality = FF_QP2LAMBDA * job->vquality + 0.5;
}
context->mb_decision = 1;
hb_log( "encavcodec: encoding at constant quantizer %d",
context->global_quality );
}
context->width = job->width;
context->height = job->height;
rate_num = job->vrate_base;
rate_den = job->vrate;
if (rate_den == 27000000)
{
int ii;
for (ii = 0; ii < hb_video_rates_count; ii++)
{
if (abs(rate_num - hb_video_rates[ii].rate) < 10)
{
rate_num = hb_video_rates[ii].rate;
break;
}
}
}
hb_reduce(&rate_num, &rate_den, rate_num, rate_den);
if ((rate_num & ~0xFFFF) || (rate_den & ~0xFFFF))
{
hb_log( "encavcodec: truncating framerate %d / %d",
rate_num, rate_den );
}
while ((rate_num & ~0xFFFF) || (rate_den & ~0xFFFF))
{
rate_num >>= 1;
rate_den >>= 1;
}
context->time_base = (AVRational) { rate_num, rate_den };
context->gop_size = 10 * job->vrate / job->vrate_base;
context->pix_fmt = PIX_FMT_YUV420P;
if( job->anamorphic.mode )
{
context->sample_aspect_ratio.num = job->anamorphic.par_width;
context->sample_aspect_ratio.den = job->anamorphic.par_height;
hb_log( "encavcodec: encoding with stored aspect %d/%d",
job->anamorphic.par_width, job->anamorphic.par_height );
}
if( job->mux & HB_MUX_MP4 )
{
context->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
if( job->grayscale )
{
context->flags |= CODEC_FLAG_GRAY;
}
if( job->pass != 0 && job->pass != -1 )
{
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( hb_avcodec_open( context, codec ) )
{
hb_log( "hb_work_encavcodec_init: avcodec_open failed" );
}
pv->context = context;
if( ( job->mux & HB_MUX_MP4 ) && 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_deep_log( 2, "encavcodec: closing libavcodec" );
avcodec_flush_buffers( pv->context );
hb_avcodec_close( pv->context );
}
if( pv->file )
{
fclose( pv->file );
}
free( pv );
w->private_data = NULL;
}
/***********************************************************************
* 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;
if ( in->size <= 0 )
{
/* EOF on input - send it downstream & say we're done */
*buf_out = in;
*buf_in = NULL;
return HB_WORK_DONE;
}
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;
// For constant quality, setting the quality in AVCodecContext
// doesn't do the trick. It must be set in the AVFrame.
frame->quality = pv->context->global_quality;
if ( pv->context->codec )
{
/* Should be way too large */
buf = hb_video_buffer_init( job->width, job->height );
buf->size = avcodec_encode_video( pv->context, buf->data, buf->alloc,
frame );
buf->start = in->start;
buf->stop = in->stop;
buf->frametype = pv->context->coded_frame->key_frame ? HB_FRAME_KEY : HB_FRAME_REF;
}
else
{
buf = NULL;
hb_error( "encavcodec: codec context has uninitialized codec; skipping 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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