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->b_vop = VLC_FALSE;
 136     p_sys->i_buffer = 0;
 137     p_sys->i_buffer_size = 0;
 138     p_sys->p_buffer = 0;
 139     p_sys->i_flags = 0;
 140     p_sys->b_frame = VLC_FALSE;
 141
 142     /* Setup properties */
 143     p_dec->fmt_out = p_dec->fmt_in;
 144     p_dec->fmt_out.i_codec = VLC_FOURCC( 'm', 'p', '4', 'v' );
 145
 146     if( p_dec->fmt_in.i_extra )
 147     {
 148         /* We have a vol */
 149         p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
 150         p_dec->fmt_out.p_extra = malloc( p_dec->fmt_in.i_extra );
 151         memcpy( p_dec->fmt_out.p_extra, p_dec->fmt_in.p_extra,
 152                 p_dec->fmt_in.i_extra );
 153
 154         msg_Dbg( p_dec, "opening with vol size:%d", p_dec->fmt_in.i_extra );
 155         m4v_VOLParse( &p_dec->fmt_out,
 156                       p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
 157     }
 158     else
 159     {
 160         /* No vol, we'll have to look for one later on */
 161         p_dec->fmt_out.i_extra = 0;
 162         p_dec->fmt_out.p_extra = 0;
 163     }
 164
 165     /* Set callback */
 166     p_dec->pf_packetize = Packetize;
 167
 168     return VLC_SUCCESS;
 169 }
 170
 171 /*****************************************************************************
 172  * Close: clean up the packetizer
 173  *****************************************************************************/
 174 static void Close( vlc_object_t *p_this )
 175 {
 176     decoder_t *p_dec = (decoder_t*)p_this;
 177
 178     if( p_dec->p_sys->p_buffer ) free( p_dec->p_sys->p_buffer );
 179     free( p_dec->p_sys );
 180 }
 181
 182 /****************************************************************************
 183  * Packetize: the whole thing
 184  ****************************************************************************/
 185 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
 186 {
 187     decoder_sys_t *p_sys = p_dec->p_sys;
 188
 189     block_t *p_chain_out = NULL;
 190     block_t *p_block;
 191     uint8_t *p_vol = NULL;
 192     uint8_t *p_start;
 193
 194     if( !pp_block || !*pp_block ) return NULL;
 195
 196     p_block = *pp_block;
 197
 198     /* Append data */
 199     if( p_sys->i_buffer + p_block->i_buffer > p_sys->i_buffer_size )
 200     {
 201         p_sys->i_buffer_size += p_block->i_buffer + 1024;
 202         p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
 203     }
 204     memcpy( &p_sys->p_buffer[p_sys->i_buffer], p_block->p_buffer,
 205             p_block->i_buffer );
 206     p_sys->i_buffer += p_block->i_buffer;
 207
 208     if( p_sys->i_buffer > 10*1000000 )
 209     {
 210         msg_Err( p_dec, "mmh reseting context" );
 211         p_sys->i_buffer = 0;
 212     }
 213
 214     /* Search vop */
 215     p_start = &p_sys->p_buffer[p_sys->i_buffer - p_block->i_buffer - 4];
 216     if( p_start < p_sys->p_buffer )
 217     {
 218         p_start = p_sys->p_buffer;
 219     }
 220     for( ;; )
 221     {
 222         if( m4v_FindStartCode( &p_start, &p_sys->p_buffer[p_sys->i_buffer] ) )
 223         {
 224             block_Release( p_block );
 225             *pp_block = NULL;
 226             return p_chain_out;
 227         }
 228         /* fprintf( stderr, "start code=0x1%2.2x\n", p_start[3] ); */
 229
 230         if( p_vol )
 231         {
 232             /* Copy the complete VOL */
 233             p_dec->fmt_out.i_extra = p_start - p_vol;
 234             p_dec->fmt_out.p_extra = malloc( p_dec->fmt_out.i_extra );
 235             memcpy( p_dec->fmt_out.p_extra, p_vol, p_dec->fmt_out.i_extra );
 236             m4v_VOLParse( &p_dec->fmt_out,
 237                           p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
 238
 239             p_vol = NULL;
 240         }
 241         if( p_sys->b_vop )
 242         {
 243             /* Output the complete VOP we have */
 244             int     i_out = p_start - p_sys->p_buffer;
 245             block_t *p_out = block_New( p_dec, i_out );
 246
 247             /* extract data */
 248             memcpy( p_out->p_buffer, p_sys->p_buffer, i_out );
 249             if( i_out < p_sys->i_buffer )
 250             {
 251                 memmove( p_sys->p_buffer, &p_sys->p_buffer[i_out],
 252                          p_sys->i_buffer - i_out );
 253             }
 254             p_sys->i_buffer -= i_out;
 255             p_start -= i_out;
 256
 257             p_out->i_flags = p_sys->i_flags;
 258
 259             /* FIXME do proper dts/pts */
 260             p_out->i_pts = p_sys->i_pts;
 261             p_out->i_dts = p_sys->i_dts;
 262             /* FIXME doesn't work when there is multiple VOP in one block */
 263             if( p_block->i_dts > p_sys->i_dts )
 264             {
 265                 p_out->i_length = p_block->i_dts - p_sys->i_dts;
 266             }
 267
 268             if( p_dec->fmt_out.i_extra > 0 )
 269             {
 270                 block_ChainAppend( &p_chain_out, p_out );
 271             }
 272             else
 273             {
 274                 msg_Warn( p_dec, "waiting for VOL" );
 275                 block_Release( p_out );
 276             }
 277
 278 #if 0
 279             fprintf( stderr, "pts=%lld dts=%lld length=%lldms\n",
 280                      p_out->i_pts, p_out->i_dts,
 281                      p_out->i_length / 1000 );
 282 #endif
 283             p_sys->b_vop = VLC_FALSE;
 284         }
 285
 286         if( p_start[3] >= 0x20 && p_start[3] <= 0x2f )
 287         {
 288             /* Start of the VOL */
 289             p_vol = p_start;
 290         }
 291         else if( p_start[3] == 0xb6 )
 292         {
 293             p_sys->b_vop = VLC_TRUE;
 294             switch( p_start[4] >> 6 )
 295             {
 296                 case 0:
 297                     p_sys->i_flags = BLOCK_FLAG_TYPE_I;
 298                     break;
 299                 case 1:
 300                     p_sys->i_flags = BLOCK_FLAG_TYPE_P;
 301                     break;
 302                 case 2:
 303                     p_sys->i_flags = BLOCK_FLAG_TYPE_B;
 304                     p_sys->b_frame = VLC_TRUE;
 305                     break;
 306                 case 3: /* gni ? */
 307                     p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
 308                     break;
 309             }
 310
 311             /* The pts information is not available in all the containers.
 312              * FIXME: calculate the pts correctly */
 313             if( p_block->i_pts > 0 )
 314             {
 315                 p_sys->i_pts = p_block->i_pts;
 316             }
 317             else if( (p_sys->i_flags&BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
 318             {
 319                 p_sys->i_pts = p_block->i_dts;
 320             }
 321             else
 322             {
 323                 p_sys->i_pts = 0;
 324             }
 325             if( p_block->i_dts > 0 )
 326             {
 327                 p_sys->i_dts = p_block->i_dts;
 328             }
 329             else if( p_sys->i_dts > 0 )
 330             {
 331                 /* XXX KLUDGE immonde, else transcode won't work */
 332                 p_sys->i_dts += 1000;
 333             }
 334         }
 335         p_start += 4; /* Next */
 336     }
 337 }
 338
 339 /****************************************************************************
 340  * m4v_FindStartCode
 341  ****************************************************************************/
 342 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
 343 {
 344     uint8_t *p = *pp_start;
 345
 346     /* We wait for 4+1 bytes */
 347     for( p = *pp_start; p < p_end - 5; p++ )
 348     {
 349         if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
 350         {
 351             *pp_start = p;
 352             return VLC_SUCCESS;
 353         }
 354     }
 355
 356     *pp_start = p_end;
 357     return VLC_EGENERIC;
 358 }
 359
 360
 361 /* look at ffmpeg av_log2 ;) */
 362 static int vlc_log2( unsigned int v )
 363 {
 364     int n = 0;
 365     static const int vlc_log2_table[16] =
 366     {
 367         0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
 368     };
 369
 370     if( v&0xffff0000 )
 371     {
 372         v >>= 16;
 373         n += 16;
 374     }
 375     if( v&0xff00 )
 376     {
 377         v >>= 8;
 378         n += 8;
 379     }
 380     if( v&0xf0 )
 381     {
 382         v >>= 4;
 383         n += 4;
 384     }
 385     n += vlc_log2_table[v];
 386
 387     return n;
 388 }
 389
 390 /* m4v_VOLParse:
 391  *  TODO:
 392  *      - support aspect ratio
 393  */
 394 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol )
 395 {
 396     bs_t s;
 397     int i_vo_type;
 398     int i_vo_ver_id;
 399     int i_ar;
 400     int i_shape;
 401     int i_time_increment_resolution;
 402
 403     for( ;; )
 404     {
 405         if( p_vol[0] == 0x00 && p_vol[1] == 0x00 &&
 406             p_vol[2] == 0x01 &&
 407             p_vol[3] >= 0x20 && p_vol[3] <= 0x2f )
 408         {
 409             break;
 410         }
 411         p_vol++;
 412         i_vol--;
 413         if( i_vol <= 4 )
 414         {
 415             return VLC_EGENERIC;
 416         }
 417     }
 418
 419     /* parse the vol */
 420     bs_init( &s, &p_vol[4], i_vol - 4 );
 421
 422     bs_skip( &s, 1 );   /* random access */
 423     i_vo_type = bs_read( &s, 8 );
 424     if( bs_read1( &s ) )
 425     {
 426         i_vo_ver_id = bs_read( &s, 4 );
 427         bs_skip( &s, 3 );
 428     }
 429     else
 430     {
 431         i_vo_ver_id = 1;
 432     }
 433     i_ar = bs_read( &s, 4 );
 434     if( i_ar == 0xf )
 435     {
 436         int i_ar_width, i_ar_height;
 437
 438         i_ar_width = bs_read( &s, 8 );
 439         i_ar_height= bs_read( &s, 8 );
 440     }
 441     if( bs_read1( &s ) )
 442     {
 443         int i_chroma_format;
 444         int i_low_delay;
 445
 446         /* vol control parameter */
 447         i_chroma_format = bs_read( &s, 2 );
 448         i_low_delay = bs_read1( &s );
 449
 450         if( bs_read1( &s ) )
 451         {
 452             bs_skip( &s, 16 );
 453             bs_skip( &s, 16 );
 454             bs_skip( &s, 16 );
 455             bs_skip( &s, 3 );
 456             bs_skip( &s, 11 );
 457             bs_skip( &s, 1 );
 458             bs_skip( &s, 16 );
 459         }
 460     }
 461     /* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
 462     i_shape = bs_read( &s, 2 );
 463     if( i_shape == 3 && i_vo_ver_id != 1 )
 464     {
 465         bs_skip( &s, 4 );
 466     }
 467
 468     if( !bs_read1( &s ) )
 469     {
 470         /* marker */
 471         return VLC_EGENERIC;
 472     }
 473     i_time_increment_resolution = bs_read( &s, 16 );
 474     if( !bs_read1( &s ) )
 475     {
 476         /* marker */
 477         return VLC_EGENERIC;
 478     }
 479
 480     if( bs_read1( &s ) )
 481     {
 482         int i_time_increment_bits = vlc_log2( i_time_increment_resolution - 1 ) + 1;
 483         if( i_time_increment_bits < 1 )
 484         {
 485             i_time_increment_bits = 1;
 486         }
 487         bs_skip( &s, i_time_increment_bits );
 488     }
 489     if( i_shape == 0 )
 490     {
 491         bs_skip( &s, 1 );
 492         fmt->video.i_width = bs_read( &s, 13 );
 493         bs_skip( &s, 1 );
 494         fmt->video.i_height= bs_read( &s, 13 );
 495         bs_skip( &s, 1 );
 496     }
 497     return VLC_SUCCESS;
 498 }
 499
 500
 501