git.sesse.net Git - x264/blob - output/mp4.c

   1 /*****************************************************************************
   2  * mp4.c: x264 mp4 output module
   3  *****************************************************************************
   4  * Copyright (C) 2003-2009 x264 project
   5  *
   6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   7  *          Loren Merritt <lorenm@u.washington.edu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 #include "muxers.h"
  25 #include <gpac/isomedia.h>
  26
  27 typedef struct
  28 {
  29     GF_ISOFile *p_file;
  30     GF_AVCConfig *p_config;
  31     GF_ISOSample *p_sample;
  32     int i_track;
  33     uint32_t i_descidx;
  34     int i_time_inc;
  35     int i_time_res;
  36     int i_numframe;
  37     int i_init_delay;
  38     uint8_t b_sps;
  39     uint8_t b_pps;
  40 } mp4_hnd_t;
  41
  42 static void recompute_bitrate_mp4( GF_ISOFile *p_file, int i_track )
  43 {
  44     u32 i, count, di, timescale, time_wnd, rate;
  45     u64 offset;
  46     Double br;
  47     GF_ESD *esd;
  48
  49     esd = gf_isom_get_esd( p_file, i_track, 1 );
  50     if( !esd )
  51         return;
  52
  53     esd->decoderConfig->avgBitrate = 0;
  54     esd->decoderConfig->maxBitrate = 0;
  55     rate = time_wnd = 0;
  56
  57     timescale = gf_isom_get_media_timescale( p_file, i_track );
  58     count = gf_isom_get_sample_count( p_file, i_track );
  59     for( i = 0; i < count; i++ )
  60     {
  61         GF_ISOSample *samp = gf_isom_get_sample_info( p_file, i_track, i+1, &di, &offset );
  62
  63         if( samp->dataLength>esd->decoderConfig->bufferSizeDB )
  64             esd->decoderConfig->bufferSizeDB = samp->dataLength;
  65
  66         if( esd->decoderConfig->bufferSizeDB < samp->dataLength )
  67             esd->decoderConfig->bufferSizeDB = samp->dataLength;
  68
  69         esd->decoderConfig->avgBitrate += samp->dataLength;
  70         rate += samp->dataLength;
  71         if( samp->DTS > time_wnd + timescale )
  72         {
  73             if( rate > esd->decoderConfig->maxBitrate )
  74                 esd->decoderConfig->maxBitrate = rate;
  75             time_wnd = samp->DTS;
  76             rate = 0;
  77         }
  78
  79         gf_isom_sample_del( &samp );
  80     }
  81
  82     br = (Double)(s64)gf_isom_get_media_duration( p_file, i_track );
  83     br /= timescale;
  84     esd->decoderConfig->avgBitrate = (u32)(esd->decoderConfig->avgBitrate / br);
  85     /*move to bps*/
  86     esd->decoderConfig->avgBitrate *= 8;
  87     esd->decoderConfig->maxBitrate *= 8;
  88
  89     gf_isom_change_mpeg4_description( p_file, i_track, 1, esd );
  90     gf_odf_desc_del( (GF_Descriptor*)esd );
  91 }
  92
  93 static int close_file( hnd_t handle )
  94 {
  95     mp4_hnd_t *p_mp4 = handle;
  96
  97     if( !p_mp4 )
  98         return 0;
  99
 100     if( p_mp4->p_config )
 101         gf_odf_avc_cfg_del( p_mp4->p_config );
 102
 103     if( p_mp4->p_sample )
 104     {
 105         if( p_mp4->p_sample->data )
 106             free( p_mp4->p_sample->data );
 107
 108         gf_isom_sample_del( &p_mp4->p_sample );
 109     }
 110
 111     if( p_mp4->p_file )
 112     {
 113         recompute_bitrate_mp4( p_mp4->p_file, p_mp4->i_track );
 114         gf_isom_set_pl_indication( p_mp4->p_file, GF_ISOM_PL_VISUAL, 0x15 );
 115         gf_isom_set_storage_mode( p_mp4->p_file, GF_ISOM_STORE_FLAT );
 116         gf_isom_close( p_mp4->p_file );
 117     }
 118
 119     free( p_mp4 );
 120
 121     return 0;
 122 }
 123
 124 static int open_file( char *psz_filename, hnd_t *p_handle )
 125 {
 126     mp4_hnd_t *p_mp4;
 127
 128     *p_handle = NULL;
 129
 130     if( !(p_mp4 = malloc( sizeof(mp4_hnd_t) )) )
 131         return -1;
 132
 133     memset( p_mp4, 0, sizeof(mp4_hnd_t) );
 134     p_mp4->p_file = gf_isom_open( psz_filename, GF_ISOM_OPEN_WRITE, NULL );
 135
 136     if( !(p_mp4->p_sample = gf_isom_sample_new()) )
 137     {
 138         close_file( p_mp4 );
 139         return -1;
 140     }
 141
 142     gf_isom_set_brand_info( p_mp4->p_file, GF_ISOM_BRAND_AVC1, 0 );
 143
 144     *p_handle = p_mp4;
 145
 146     return 0;
 147 }
 148
 149 static int set_param( hnd_t handle, x264_param_t *p_param )
 150 {
 151     mp4_hnd_t *p_mp4 = handle;
 152
 153     p_mp4->i_track = gf_isom_new_track( p_mp4->p_file, 0, GF_ISOM_MEDIA_VISUAL,
 154                                         p_param->i_fps_num );
 155
 156     p_mp4->p_config = gf_odf_avc_cfg_new();
 157     gf_isom_avc_config_new( p_mp4->p_file, p_mp4->i_track, p_mp4->p_config,
 158                             NULL, NULL, &p_mp4->i_descidx );
 159
 160     gf_isom_set_track_enabled( p_mp4->p_file, p_mp4->i_track, 1 );
 161
 162     gf_isom_set_visual_info( p_mp4->p_file, p_mp4->i_track, p_mp4->i_descidx,
 163                              p_param->i_width, p_param->i_height );
 164
 165     if( p_param->vui.i_sar_width && p_param->vui.i_sar_height )
 166     {
 167         uint64_t dw = p_param->i_width << 16;
 168         uint64_t dh = p_param->i_height << 16;
 169         double sar = (double)p_param->vui.i_sar_width / p_param->vui.i_sar_height;
 170         if( sar > 1.0 )
 171             dw *= sar ;
 172         else
 173             dh /= sar;
 174         gf_isom_set_track_layout_info( p_mp4->p_file, p_mp4->i_track, dw, dh, 0, 0, 0 );
 175     }
 176
 177     p_mp4->p_sample->data = malloc( p_param->i_width * p_param->i_height * 3 / 2 );
 178     if( !p_mp4->p_sample->data )
 179         return -1;
 180
 181     p_mp4->i_time_res = p_param->i_fps_num;
 182     p_mp4->i_time_inc = p_param->i_fps_den;
 183     p_mp4->i_init_delay = p_param->i_bframe ? (p_param->i_bframe_pyramid ? 2 : 1) : 0;
 184     p_mp4->i_init_delay *= p_mp4->i_time_inc;
 185     fprintf( stderr, "mp4 [info]: initial delay %d (scale %d)\n",
 186              p_mp4->i_init_delay, p_mp4->i_time_res );
 187
 188     return 0;
 189 }
 190
 191 static int write_nalu( hnd_t handle, uint8_t *p_nalu, int i_size )
 192 {
 193     mp4_hnd_t *p_mp4 = handle;
 194     GF_AVCConfigSlot *p_slot;
 195     uint8_t type = p_nalu[4] & 0x1f;
 196     int psize;
 197
 198     switch( type )
 199     {
 200         // sps
 201         case 0x07:
 202             if( !p_mp4->b_sps )
 203             {
 204                 p_mp4->p_config->configurationVersion = 1;
 205                 p_mp4->p_config->AVCProfileIndication = p_nalu[5];
 206                 p_mp4->p_config->profile_compatibility = p_nalu[6];
 207                 p_mp4->p_config->AVCLevelIndication = p_nalu[7];
 208                 p_slot = malloc( sizeof(GF_AVCConfigSlot) );
 209                 if( !p_slot )
 210                     return -1;
 211                 p_slot->size = i_size - 4;
 212                 p_slot->data = malloc( p_slot->size );
 213                 if( !p_slot->data )
 214                     return -1;
 215                 memcpy( p_slot->data, p_nalu + 4, i_size - 4 );
 216                 gf_list_add( p_mp4->p_config->sequenceParameterSets, p_slot );
 217                 p_slot = NULL;
 218                 p_mp4->b_sps = 1;
 219             }
 220             break;
 221
 222         // pps
 223         case 0x08:
 224             if( !p_mp4->b_pps )
 225             {
 226                 p_slot = malloc( sizeof(GF_AVCConfigSlot) );
 227                 if( !p_slot )
 228                     return -1;
 229                 p_slot->size = i_size - 4;
 230                 p_slot->data = malloc( p_slot->size );
 231                 if( !p_slot->data )
 232                     return -1;
 233                 memcpy( p_slot->data, p_nalu + 4, i_size - 4 );
 234                 gf_list_add( p_mp4->p_config->pictureParameterSets, p_slot );
 235                 p_slot = NULL;
 236                 p_mp4->b_pps = 1;
 237                 if( p_mp4->b_sps )
 238                     gf_isom_avc_config_update( p_mp4->p_file, p_mp4->i_track, 1, p_mp4->p_config );
 239             }
 240             break;
 241
 242         // slice, sei
 243         case 0x1:
 244         case 0x5:
 245         case 0x6:
 246             psize = i_size - 4;
 247             memcpy( p_mp4->p_sample->data + p_mp4->p_sample->dataLength, p_nalu, i_size );
 248             p_mp4->p_sample->data[p_mp4->p_sample->dataLength + 0] = psize >> 24;
 249             p_mp4->p_sample->data[p_mp4->p_sample->dataLength + 1] = psize >> 16;
 250             p_mp4->p_sample->data[p_mp4->p_sample->dataLength + 2] = psize >>  8;
 251             p_mp4->p_sample->data[p_mp4->p_sample->dataLength + 3] = psize >>  0;
 252             p_mp4->p_sample->dataLength += i_size;
 253             break;
 254     }
 255
 256     return i_size;
 257 }
 258
 259 static int set_eop( hnd_t handle, x264_picture_t *p_picture )
 260 {
 261     mp4_hnd_t *p_mp4 = handle;
 262     uint64_t dts = (uint64_t)p_mp4->i_numframe * p_mp4->i_time_inc;
 263     uint64_t pts = (uint64_t)p_picture->i_pts;
 264     int32_t offset = p_mp4->i_init_delay + pts - dts;
 265
 266     p_mp4->p_sample->IsRAP = p_picture->i_type == X264_TYPE_IDR ? 1 : 0;
 267     p_mp4->p_sample->DTS = dts;
 268     p_mp4->p_sample->CTS_Offset = offset;
 269     gf_isom_add_sample( p_mp4->p_file, p_mp4->i_track, p_mp4->i_descidx, p_mp4->p_sample );
 270
 271     p_mp4->p_sample->dataLength = 0;
 272     p_mp4->i_numframe++;
 273
 274     return 0;
 275 }
 276
 277 cli_output_t mp4_output = { open_file, set_param, write_nalu, set_eop, close_file };