libhb/encavcodec.c

   1 /* $Id: encavcodec.c,v 1.23 2005/10/13 23:47:06 titer Exp $
   2
   3    This file is part of the HandBrake source code.
   4    Homepage: <http://handbrake.m0k.org/>.
   5    It may be used under the terms of the GNU General Public License. */
   6
   7 #include "hb.h"
   8
   9 #include "ffmpeg/avcodec.h"
  10
  11 struct hb_work_private_s
  12 {
  13     hb_job_t * job;
  14     AVCodecContext * context;
  15     FILE * file;
  16 };
  17
  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 * );
  21
  22 hb_work_object_t hb_encavcodec =
  23 {
  24     WORK_ENCAVCODEC,
  25     "MPEG-4 encoder (libavcodec)",
  26     encavcodecInit,
  27     encavcodecWork,
  28     encavcodecClose
  29 };
  30
  31 int encavcodecInit( hb_work_object_t * w, hb_job_t * job )
  32 {
  33     AVCodec * codec;
  34     AVCodecContext * context;
  35
  36     hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
  37     w->private_data = pv;
  38
  39     pv->job = job;
  40
  41     codec = avcodec_find_encoder( CODEC_ID_MPEG4 );
  42     if( !codec )
  43     {
  44         hb_log( "hb_work_encavcodec_init: avcodec_find_encoder "
  45                 "failed" );
  46     }
  47     context = avcodec_alloc_context();
  48     if( job->vquality < 0.0 || job->vquality > 1.0 )
  49     {
  50         /* Rate control */
  51         context->bit_rate = 1000 * job->vbitrate;
  52         context->bit_rate_tolerance = 10 * context->bit_rate;
  53     }
  54     else
  55     {
  56         /* Constant quantizer */
  57         context->qmin = 31 - job->vquality * 30;
  58         context->qmax = context->qmin;
  59         hb_log( "encavcodec: encoding at constant quantizer %d",
  60                 context->qmin );
  61     }
  62     context->width     = job->width;
  63     context->height    = job->height;
  64     context->time_base = (AVRational) { job->vrate_base, job->vrate };
  65     context->gop_size  = 10 * job->vrate / job->vrate_base;
  66     context->pix_fmt   = PIX_FMT_YUV420P;
  67
  68     if( job->pixel_ratio )
  69     {
  70         context->sample_aspect_ratio.num = job->pixel_aspect_width;
  71         context->sample_aspect_ratio.den = job->pixel_aspect_height;
  72
  73         hb_log( "encavcodec: encoding with stored aspect %d/%d",
  74                 job->pixel_aspect_width, job->pixel_aspect_height );
  75     }
  76
  77     if( job->mux & ( HB_MUX_MP4 | HB_MUX_PSP ) )
  78     {
  79         context->flags |= CODEC_FLAG_GLOBAL_HEADER;
  80     }
  81     if( job->mux & HB_MUX_PSP )
  82     {
  83         context->flags |= CODEC_FLAG_BITEXACT;
  84     }
  85     if( job->grayscale )
  86     {
  87         context->flags |= CODEC_FLAG_GRAY;
  88     }
  89
  90     if( job->pass )
  91     {
  92         char filename[1024]; memset( filename, 0, 1024 );
  93         hb_get_tempory_filename( job->h, filename, "ffmpeg.log" );
  94
  95         if( job->pass == 1 )
  96         {
  97             pv->file = fopen( filename, "wb" );
  98             context->flags |= CODEC_FLAG_PASS1;
  99         }
 100         else
 101         {
 102             int    size;
 103             char * log;
 104
 105             pv->file = fopen( filename, "rb" );
 106             fseek( pv->file, 0, SEEK_END );
 107             size = ftell( pv->file );
 108             fseek( pv->file, 0, SEEK_SET );
 109             log = malloc( size + 1 );
 110             log[size] = '\0';
 111             fread( log, size, 1, pv->file );
 112             fclose( pv->file );
 113             pv->file = NULL;
 114
 115             context->flags    |= CODEC_FLAG_PASS2;
 116             context->stats_in  = log;
 117         }
 118     }
 119
 120     if( avcodec_open( context, codec ) )
 121     {
 122         hb_log( "hb_work_encavcodec_init: avcodec_open failed" );
 123     }
 124     pv->context = context;
 125
 126     if( ( job->mux & ( HB_MUX_MP4 | HB_MUX_PSP ) ) && job->pass != 1 )
 127     {
 128 #if 0
 129         /* Hem hem */
 130         w->config->mpeg4.length = 15;
 131         memcpy( w->config->mpeg4.bytes, context->extradata + 15, 15 );
 132 #else
 133         w->config->mpeg4.length = context->extradata_size;
 134         memcpy( w->config->mpeg4.bytes, context->extradata,
 135                 context->extradata_size );
 136 #endif
 137     }
 138
 139     return 0;
 140 }
 141
 142 /***********************************************************************
 143  * Close
 144  ***********************************************************************
 145  *
 146  **********************************************************************/
 147 void encavcodecClose( hb_work_object_t * w )
 148 {
 149     hb_work_private_t * pv = w->private_data;
 150
 151     if( pv->context )
 152     {
 153         hb_log( "encavcodec: closing libavcodec" );
 154         avcodec_flush_buffers( pv->context );
 155         avcodec_close( pv->context );
 156     }
 157     if( pv->file )
 158     {
 159         fclose( pv->file );
 160     }
 161     free( pv );
 162     w->private_data = NULL;
 163 }
 164
 165 /***********************************************************************
 166  * Work
 167  ***********************************************************************
 168  *
 169  **********************************************************************/
 170 int encavcodecWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
 171                     hb_buffer_t ** buf_out )
 172 {
 173     hb_work_private_t * pv = w->private_data;
 174     hb_job_t * job = pv->job;
 175     AVFrame  * frame;
 176     hb_buffer_t * in = *buf_in, * buf;
 177
 178     if(!in->data)
 179     {
 180        *buf_out        = NULL;
 181        return HB_WORK_DONE;
 182     }
 183
 184     frame              = avcodec_alloc_frame();
 185     frame->data[0]     = in->data;
 186     frame->data[1]     = frame->data[0] + job->width * job->height;
 187     frame->data[2]     = frame->data[1] + job->width * job->height / 4;
 188     frame->linesize[0] = job->width;
 189     frame->linesize[1] = job->width / 2;
 190     frame->linesize[2] = job->width / 2;
 191
 192     /* Should be way too large */
 193     buf = hb_buffer_init( 3 * job->width * job->height / 2 );
 194     buf->size = avcodec_encode_video( pv->context, buf->data, buf->alloc,
 195                                       frame );
 196     buf->start = in->start;
 197     buf->stop  = in->stop;
 198     buf->frametype   = pv->context->coded_frame->key_frame ? HB_FRAME_KEY : HB_FRAME_REF;
 199
 200     av_free( frame );
 201
 202     if( job->pass == 1 )
 203     {
 204         /* Write stats */
 205         fprintf( pv->file, "%s", pv->context->stats_out );
 206     }
 207
 208     *buf_out = buf;
 209
 210     return HB_WORK_OK;
 211 }
 212
 213