1 /* $Id: encavcodec.c,v 1.23 2005/10/13 23:47:06 titer Exp $
3 This file is part of the HandBrake source code.
4 Homepage: <http://handbrake.fr/>.
5 It may be used under the terms of the GNU General Public License. */
9 #include "libavcodec/avcodec.h"
11 struct hb_work_private_s
14 AVCodecContext * context;
18 int encavcodecInit( hb_work_object_t *, hb_job_t * );
19 int encavcodecWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
20 void encavcodecClose( hb_work_object_t * );
22 hb_work_object_t hb_encavcodec =
25 "MPEG-4 encoder (libavcodec)",
31 int encavcodecInit( hb_work_object_t * w, hb_job_t * job )
34 AVCodecContext * context;
35 int rate_num, rate_den;
37 hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
42 codec = avcodec_find_encoder( CODEC_ID_MPEG4 );
45 hb_log( "hb_work_encavcodec_init: avcodec_find_encoder "
48 context = avcodec_alloc_context();
49 if( job->vquality < 0.0 )
52 context->bit_rate = 1000 * job->vbitrate;
53 context->bit_rate_tolerance = 10 * context->bit_rate;
57 /* Constant quantizer */
58 // These settings produce better image quality than
59 // what was previously used
60 context->flags |= CODEC_FLAG_QSCALE;
61 if (job->vquality < 1.0)
64 vquality = 31 - job->vquality * 31;
65 // A value of 0 has undefined behavior
66 // and ffmpeg qp has integral increments
69 context->global_quality = FF_QP2LAMBDA * vquality + 0.5;
73 context->global_quality = FF_QP2LAMBDA * job->vquality + 0.5;
75 context->mb_decision = 1;
76 hb_log( "encavcodec: encoding at constant quantizer %d",
77 context->global_quality );
79 context->width = job->width;
80 context->height = job->height;
81 rate_num = job->vrate_base;
82 rate_den = job->vrate;
83 if (rate_den == 27000000)
86 for (ii = 0; ii < hb_video_rates_count; ii++)
88 if (abs(rate_num - hb_video_rates[ii].rate) < 10)
90 rate_num = hb_video_rates[ii].rate;
95 hb_reduce(&rate_num, &rate_den, rate_num, rate_den);
96 if ((rate_num & ~0xFFFF) || (rate_den & ~0xFFFF))
98 hb_log( "encavcodec: truncating framerate %d / %d",
101 while ((rate_num & ~0xFFFF) || (rate_den & ~0xFFFF))
106 context->time_base = (AVRational) { rate_num, rate_den };
107 context->gop_size = 10 * job->vrate / job->vrate_base;
108 context->pix_fmt = PIX_FMT_YUV420P;
110 if( job->pixel_ratio )
112 context->sample_aspect_ratio.num = job->pixel_aspect_width;
113 context->sample_aspect_ratio.den = job->pixel_aspect_height;
115 hb_log( "encavcodec: encoding with stored aspect %d/%d",
116 job->pixel_aspect_width, job->pixel_aspect_height );
119 if( job->mux & ( HB_MUX_MP4 | HB_MUX_PSP ) )
121 context->flags |= CODEC_FLAG_GLOBAL_HEADER;
123 if( job->mux & HB_MUX_PSP )
125 context->flags |= CODEC_FLAG_BITEXACT;
129 context->flags |= CODEC_FLAG_GRAY;
132 if( job->pass != 0 && job->pass != -1 )
134 char filename[1024]; memset( filename, 0, 1024 );
135 hb_get_tempory_filename( job->h, filename, "ffmpeg.log" );
139 pv->file = fopen( filename, "wb" );
140 context->flags |= CODEC_FLAG_PASS1;
147 pv->file = fopen( filename, "rb" );
148 fseek( pv->file, 0, SEEK_END );
149 size = ftell( pv->file );
150 fseek( pv->file, 0, SEEK_SET );
151 log = malloc( size + 1 );
153 fread( log, size, 1, pv->file );
157 context->flags |= CODEC_FLAG_PASS2;
158 context->stats_in = log;
162 if( avcodec_open( context, codec ) )
164 hb_log( "hb_work_encavcodec_init: avcodec_open failed" );
166 pv->context = context;
168 if( ( job->mux & ( HB_MUX_MP4 | HB_MUX_PSP ) ) && job->pass != 1 )
172 w->config->mpeg4.length = 15;
173 memcpy( w->config->mpeg4.bytes, context->extradata + 15, 15 );
175 w->config->mpeg4.length = context->extradata_size;
176 memcpy( w->config->mpeg4.bytes, context->extradata,
177 context->extradata_size );
184 /***********************************************************************
186 ***********************************************************************
188 **********************************************************************/
189 void encavcodecClose( hb_work_object_t * w )
191 hb_work_private_t * pv = w->private_data;
195 hb_deep_log( 2, "encavcodec: closing libavcodec" );
196 avcodec_flush_buffers( pv->context );
197 avcodec_close( pv->context );
204 w->private_data = NULL;
207 /***********************************************************************
209 ***********************************************************************
211 **********************************************************************/
212 int encavcodecWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
213 hb_buffer_t ** buf_out )
215 hb_work_private_t * pv = w->private_data;
216 hb_job_t * job = pv->job;
218 hb_buffer_t * in = *buf_in, * buf;
222 /* EOF on input - send it downstream & say we're done */
228 frame = avcodec_alloc_frame();
229 frame->data[0] = in->data;
230 frame->data[1] = frame->data[0] + job->width * job->height;
231 frame->data[2] = frame->data[1] + job->width * job->height / 4;
232 frame->linesize[0] = job->width;
233 frame->linesize[1] = job->width / 2;
234 frame->linesize[2] = job->width / 2;
235 // For constant quality, setting the quality in AVCodecContext
236 // doesn't do the trick. It must be set in the AVFrame.
237 frame->quality = pv->context->global_quality;
239 /* Should be way too large */
240 buf = hb_video_buffer_init( job->width, job->height );
241 buf->size = avcodec_encode_video( pv->context, buf->data, buf->alloc,
243 buf->start = in->start;
244 buf->stop = in->stop;
245 buf->frametype = pv->context->coded_frame->key_frame ? HB_FRAME_KEY : HB_FRAME_REF;
252 fprintf( pv->file, "%s", pv->context->stats_out );