git.sesse.net Git - vlc/blob - modules/packetizer/mpeg4video.c

   1 /*****************************************************************************
   2  * mpeg4video.c: mpeg 4 video packetizer
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002 VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Eric Petit <titer@videolan.org>
   9  *          Gildas Bazin <gbazin@netcourrier.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include <stdlib.h>                                      /* malloc(), free() */
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc/decoder.h>
  33 #include <vlc/sout.h>
  34
  35 #include "vlc_bits.h"
  36
  37 /*****************************************************************************
  38  * Module descriptor
  39  *****************************************************************************/
  40 static int  Open ( vlc_object_t * );
  41 static void Close( vlc_object_t * );
  42
  43 vlc_module_begin();
  44     set_description( _("MPEG4 video packetizer") );
  45     set_capability( "packetizer", 50 );
  46     set_callbacks( Open, Close );
  47 vlc_module_end();
  48
  49
  50 /****************************************************************************
  51  * Local prototypes
  52  ****************************************************************************/
  53 static block_t *Packetize( decoder_t *, block_t ** );
  54
  55 struct decoder_sys_t
  56 {
  57     /*
  58      * Common properties
  59      */
  60     mtime_t i_pts;
  61     mtime_t i_dts;
  62
  63
  64     vlc_bool_t  b_vop;
  65     int         i_buffer;
  66     int         i_buffer_size;
  67     uint8_t     *p_buffer;
  68     unsigned int i_flags;
  69
  70     vlc_bool_t  b_frame;
  71 };
  72
  73 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end );
  74 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol );
  75
  76 #define VIDEO_OBJECT_MASK                       0x01f
  77 #define VIDEO_OBJECT_LAYER_MASK                 0x00f
  78
  79 #define VIDEO_OBJECT_START_CODE                 0x100
  80 #define VIDEO_OBJECT_LAYER_START_CODE           0x120
  81 #define VISUAL_OBJECT_SEQUENCE_START_CODE       0x1b0
  82 #define VISUAL_OBJECT_SEQUENCE_END_CODE         0x1b1
  83 #define USER_DATA_START_CODE                    0x1b2
  84 #define GROUP_OF_VOP_START_CODE                 0x1b3
  85 #define VIDEO_SESSION_ERROR_CODE                0x1b4
  86 #define VISUAL_OBJECT_START_CODE                0x1b5
  87 #define VOP_START_CODE                          0x1b6
  88 #define FACE_OBJECT_START_CODE                  0x1ba
  89 #define FACE_OBJECT_PLANE_START_CODE            0x1bb
  90 #define MESH_OBJECT_START_CODE                  0x1bc
  91 #define MESH_OBJECT_PLANE_START_CODE            0x1bd
  92 #define STILL_TEXTURE_OBJECT_START_CODE         0x1be
  93 #define TEXTURE_SPATIAL_LAYER_START_CODE        0x1bf
  94 #define TEXTURE_SNR_LAYER_START_CODE            0x1c0
  95
  96 /*****************************************************************************
  97  * Open: probe the packetizer and return score
  98  *****************************************************************************/
  99 static int Open( vlc_object_t *p_this )
 100 {
 101     decoder_t     *p_dec = (decoder_t*)p_this;
 102     decoder_sys_t *p_sys;
 103
 104     switch( p_dec->fmt_in.i_codec )
 105     {
 106         case VLC_FOURCC( 'm', '4', 's', '2'):
 107         case VLC_FOURCC( 'M', '4', 'S', '2'):
 108         case VLC_FOURCC( 'm', 'p', '4', 's'):
 109         case VLC_FOURCC( 'M', 'P', '4', 'S'):
 110         case VLC_FOURCC( 'm', 'p', '4', 'v'):
 111         case VLC_FOURCC( 'D', 'I', 'V', 'X'):
 112         case VLC_FOURCC( 'd', 'i', 'v', 'x'):
 113         case VLC_FOURCC( 'X', 'V', 'I', 'D'):
 114         case VLC_FOURCC( 'X', 'v', 'i', 'D'):
 115         case VLC_FOURCC( 'x', 'v', 'i', 'd'):
 116         case VLC_FOURCC( 'D', 'X', '5', '0'):
 117         case VLC_FOURCC( 'd', 'x', '5', '0'):
 118         case VLC_FOURCC( 0x04, 0,   0,   0):
 119         case VLC_FOURCC( '3', 'I', 'V', '2'):
 120         case VLC_FOURCC( 'm', '4', 'c', 'c'):
 121         case VLC_FOURCC( 'M', '4', 'C', 'C'):
 122             break;
 123
 124         default:
 125             return VLC_EGENERIC;
 126     }
 127
 128     /* Allocate the memory needed to store the decoder's structure */
 129     if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
 130     {
 131         msg_Err( p_dec, "out of memory" );
 132         return VLC_EGENERIC;
 133     }
 134     p_sys->i_pts = 0;
 135     p_sys->i_dts = 0;
 136     p_sys->b_vop = VLC_FALSE;
 137     p_sys->i_buffer = 0;
 138     p_sys->i_buffer_size = 0;
 139     p_sys->p_buffer = 0;
 140     p_sys->i_flags = 0;
 141     p_sys->b_frame = VLC_FALSE;
 142
 143     /* Setup properties */
 144     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 145     p_dec->fmt_out.i_codec = VLC_FOURCC( 'm', 'p', '4', 'v' );
 146
 147     if( p_dec->fmt_in.i_extra )
 148     {
 149         /* We have a vol */
 150         p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
 151         p_dec->fmt_out.p_extra = malloc( p_dec->fmt_in.i_extra );
 152         memcpy( p_dec->fmt_out.p_extra, p_dec->fmt_in.p_extra,
 153                 p_dec->fmt_in.i_extra );
 154
 155         msg_Dbg( p_dec, "opening with vol size:%d", p_dec->fmt_in.i_extra );
 156         m4v_VOLParse( &p_dec->fmt_out,
 157                       p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
 158     }
 159     else
 160     {
 161         /* No vol, we'll have to look for one later on */
 162         p_dec->fmt_out.i_extra = 0;
 163         p_dec->fmt_out.p_extra = 0;
 164     }
 165
 166     /* Set callback */
 167     p_dec->pf_packetize = Packetize;
 168
 169     return VLC_SUCCESS;
 170 }
 171
 172 /*****************************************************************************
 173  * Close: clean up the packetizer
 174  *****************************************************************************/
 175 static void Close( vlc_object_t *p_this )
 176 {
 177     decoder_t *p_dec = (decoder_t*)p_this;
 178
 179     if( p_dec->p_sys->p_buffer ) free( p_dec->p_sys->p_buffer );
 180     free( p_dec->p_sys );
 181 }
 182
 183 /****************************************************************************
 184  * Packetize: the whole thing
 185  ****************************************************************************/
 186 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
 187 {
 188     decoder_sys_t *p_sys = p_dec->p_sys;
 189
 190     block_t *p_chain_out = NULL;
 191     block_t *p_block;
 192     uint8_t *p_vol = NULL;
 193     uint8_t *p_start;
 194
 195     if( !pp_block || !*pp_block ) return NULL;
 196
 197     p_block = *pp_block;
 198
 199     /* Append data */
 200     if( p_sys->i_buffer + p_block->i_buffer > p_sys->i_buffer_size )
 201     {
 202         p_sys->i_buffer_size += p_block->i_buffer + 1024;
 203         p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
 204     }
 205     memcpy( &p_sys->p_buffer[p_sys->i_buffer], p_block->p_buffer,
 206             p_block->i_buffer );
 207     p_sys->i_buffer += p_block->i_buffer;
 208
 209     if( p_sys->i_buffer > 10*1000000 )
 210     {
 211         msg_Err( p_dec, "mmh reseting context" );
 212         p_sys->i_buffer = 0;
 213     }
 214
 215     /* Search vop */
 216     p_start = &p_sys->p_buffer[p_sys->i_buffer - p_block->i_buffer - 4];
 217     if( p_start < p_sys->p_buffer )
 218     {
 219         p_start = p_sys->p_buffer;
 220     }
 221     for( ;; )
 222     {
 223         if( m4v_FindStartCode( &p_start, &p_sys->p_buffer[p_sys->i_buffer] ) )
 224         {
 225             block_Release( p_block );
 226             *pp_block = NULL;
 227             return p_chain_out;
 228         }
 229         /* fprintf( stderr, "start code=0x1%2.2x\n", p_start[3] ); */
 230
 231         if( p_vol )
 232         {
 233             /* Copy the complete VOL */
 234             p_dec->fmt_out.i_extra = p_start - p_vol;
 235             p_dec->fmt_out.p_extra =
 236                 realloc( p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
 237             memcpy( p_dec->fmt_out.p_extra, p_vol, p_dec->fmt_out.i_extra );
 238             m4v_VOLParse( &p_dec->fmt_out,
 239                           p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
 240
 241             p_vol = NULL;
 242         }
 243         if( p_sys->b_vop )
 244         {
 245             /* Output the complete VOP we have */
 246             int     i_out = p_start - p_sys->p_buffer;
 247             block_t *p_out = block_New( p_dec, i_out );
 248
 249             /* extract data */
 250             memcpy( p_out->p_buffer, p_sys->p_buffer, i_out );
 251             if( i_out < p_sys->i_buffer )
 252             {
 253                 memmove( p_sys->p_buffer, &p_sys->p_buffer[i_out],
 254                          p_sys->i_buffer - i_out );
 255             }
 256             p_sys->i_buffer -= i_out;
 257             p_start -= i_out;
 258
 259             p_out->i_flags = p_sys->i_flags;
 260
 261             /* FIXME do proper dts/pts */
 262             p_out->i_pts = p_sys->i_pts;
 263             p_out->i_dts = p_sys->i_dts;
 264             /* FIXME doesn't work when there is multiple VOP in one block */
 265             if( p_block->i_dts > p_sys->i_dts )
 266             {
 267                 p_out->i_length = p_block->i_dts - p_sys->i_dts;
 268             }
 269
 270             if( p_dec->fmt_out.i_extra > 0 )
 271             {
 272                 block_ChainAppend( &p_chain_out, p_out );
 273             }
 274             else
 275             {
 276                 msg_Warn( p_dec, "waiting for VOL" );
 277                 block_Release( p_out );
 278             }
 279
 280 #if 0
 281             fprintf( stderr, "pts=%lld dts=%lld length=%lldms\n",
 282                      p_out->i_pts, p_out->i_dts,
 283                      p_out->i_length / 1000 );
 284 #endif
 285             p_sys->b_vop = VLC_FALSE;
 286         }
 287
 288         if( p_start[3] >= 0x20 && p_start[3] <= 0x2f )
 289         {
 290             /* Start of the VOL */
 291             p_vol = p_start;
 292         }
 293         else if( p_start[3] == 0xb6 )
 294         {
 295             p_sys->b_vop = VLC_TRUE;
 296             switch( p_start[4] >> 6 )
 297             {
 298                 case 0:
 299                     p_sys->i_flags = BLOCK_FLAG_TYPE_I;
 300                     break;
 301                 case 1:
 302                     p_sys->i_flags = BLOCK_FLAG_TYPE_P;
 303                     break;
 304                 case 2:
 305                     p_sys->i_flags = BLOCK_FLAG_TYPE_B;
 306                     p_sys->b_frame = VLC_TRUE;
 307                     break;
 308                 case 3: /* gni ? */
 309                     p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
 310                     break;
 311             }
 312
 313             /* The pts information is not available in all the containers.
 314              * FIXME: calculate the pts correctly */
 315             if( p_block->i_pts > 0 )
 316             {
 317                 p_sys->i_pts = p_block->i_pts;
 318             }
 319             else if( (p_sys->i_flags&BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
 320             {
 321                 p_sys->i_pts = p_block->i_dts;
 322             }
 323             else
 324             {
 325                 p_sys->i_pts = 0;
 326             }
 327             if( p_block->i_dts > 0 )
 328             {
 329                 p_sys->i_dts = p_block->i_dts;
 330             }
 331             else if( p_sys->i_dts > 0 )
 332             {
 333                 /* XXX KLUDGE immonde, else transcode won't work */
 334                 p_sys->i_dts += 1000;
 335             }
 336         }
 337         p_start += 4; /* Next */
 338     }
 339 }
 340
 341 /****************************************************************************
 342  * m4v_FindStartCode
 343  ****************************************************************************/
 344 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
 345 {
 346     uint8_t *p = *pp_start;
 347
 348     /* We wait for 4+1 bytes */
 349     for( p = *pp_start; p < p_end - 5; p++ )
 350     {
 351         if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
 352         {
 353             *pp_start = p;
 354             return VLC_SUCCESS;
 355         }
 356     }
 357
 358     *pp_start = p_end;
 359     return VLC_EGENERIC;
 360 }
 361
 362
 363 /* look at ffmpeg av_log2 ;) */
 364 static int vlc_log2( unsigned int v )
 365 {
 366     int n = 0;
 367     static const int vlc_log2_table[16] =
 368     {
 369         0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
 370     };
 371
 372     if( v&0xffff0000 )
 373     {
 374         v >>= 16;
 375         n += 16;
 376     }
 377     if( v&0xff00 )
 378     {
 379         v >>= 8;
 380         n += 8;
 381     }
 382     if( v&0xf0 )
 383     {
 384         v >>= 4;
 385         n += 4;
 386     }
 387     n += vlc_log2_table[v];
 388
 389     return n;
 390 }
 391
 392 /* m4v_VOLParse:
 393  *  TODO:
 394  *      - support aspect ratio
 395  */
 396 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol )
 397 {
 398     bs_t s;
 399     int i_vo_type;
 400     int i_vo_ver_id;
 401     int i_ar;
 402     int i_shape;
 403     int i_time_increment_resolution;
 404
 405     for( ;; )
 406     {
 407         if( p_vol[0] == 0x00 && p_vol[1] == 0x00 &&
 408             p_vol[2] == 0x01 &&
 409             p_vol[3] >= 0x20 && p_vol[3] <= 0x2f )
 410         {
 411             break;
 412         }
 413         p_vol++;
 414         i_vol--;
 415         if( i_vol <= 4 )
 416         {
 417             return VLC_EGENERIC;
 418         }
 419     }
 420
 421     /* parse the vol */
 422     bs_init( &s, &p_vol[4], i_vol - 4 );
 423
 424     bs_skip( &s, 1 );   /* random access */
 425     i_vo_type = bs_read( &s, 8 );
 426     if( bs_read1( &s ) )
 427     {
 428         i_vo_ver_id = bs_read( &s, 4 );
 429         bs_skip( &s, 3 );
 430     }
 431     else
 432     {
 433         i_vo_ver_id = 1;
 434     }
 435     i_ar = bs_read( &s, 4 );
 436     if( i_ar == 0xf )
 437     {
 438         int i_ar_width, i_ar_height;
 439
 440         i_ar_width = bs_read( &s, 8 );
 441         i_ar_height= bs_read( &s, 8 );
 442     }
 443     if( bs_read1( &s ) )
 444     {
 445         int i_chroma_format;
 446         int i_low_delay;
 447
 448         /* vol control parameter */
 449         i_chroma_format = bs_read( &s, 2 );
 450         i_low_delay = bs_read1( &s );
 451
 452         if( bs_read1( &s ) )
 453         {
 454             bs_skip( &s, 16 );
 455             bs_skip( &s, 16 );
 456             bs_skip( &s, 16 );
 457             bs_skip( &s, 3 );
 458             bs_skip( &s, 11 );
 459             bs_skip( &s, 1 );
 460             bs_skip( &s, 16 );
 461         }
 462     }
 463     /* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
 464     i_shape = bs_read( &s, 2 );
 465     if( i_shape == 3 && i_vo_ver_id != 1 )
 466     {
 467         bs_skip( &s, 4 );
 468     }
 469
 470     if( !bs_read1( &s ) )
 471     {
 472         /* marker */
 473         return VLC_EGENERIC;
 474     }
 475     i_time_increment_resolution = bs_read( &s, 16 );
 476     if( !bs_read1( &s ) )
 477     {
 478         /* marker */
 479         return VLC_EGENERIC;
 480     }
 481
 482     if( bs_read1( &s ) )
 483     {
 484         int i_time_increment_bits = vlc_log2( i_time_increment_resolution - 1 ) + 1;
 485         if( i_time_increment_bits < 1 )
 486         {
 487             i_time_increment_bits = 1;
 488         }
 489         bs_skip( &s, i_time_increment_bits );
 490     }
 491     if( i_shape == 0 )
 492     {
 493         bs_skip( &s, 1 );
 494         fmt->video.i_width = bs_read( &s, 13 );
 495         bs_skip( &s, 1 );
 496         fmt->video.i_height= bs_read( &s, 13 );
 497         bs_skip( &s, 1 );
 498     }
 499     return VLC_SUCCESS;
 500 }