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
  71 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end );
  72 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol );
  73
  74 #define VIDEO_OBJECT_MASK                       0x01f
  75 #define VIDEO_OBJECT_LAYER_MASK                 0x00f
  76
  77 #define VIDEO_OBJECT_START_CODE                 0x100
  78 #define VIDEO_OBJECT_LAYER_START_CODE           0x120
  79 #define VISUAL_OBJECT_SEQUENCE_START_CODE       0x1b0
  80 #define VISUAL_OBJECT_SEQUENCE_END_CODE         0x1b1
  81 #define USER_DATA_START_CODE                    0x1b2
  82 #define GROUP_OF_VOP_START_CODE                 0x1b3
  83 #define VIDEO_SESSION_ERROR_CODE                0x1b4
  84 #define VISUAL_OBJECT_START_CODE                0x1b5
  85 #define VOP_START_CODE                          0x1b6
  86 #define FACE_OBJECT_START_CODE                  0x1ba
  87 #define FACE_OBJECT_PLANE_START_CODE            0x1bb
  88 #define MESH_OBJECT_START_CODE                  0x1bc
  89 #define MESH_OBJECT_PLANE_START_CODE            0x1bd
  90 #define STILL_TEXTURE_OBJECT_START_CODE         0x1be
  91 #define TEXTURE_SPATIAL_LAYER_START_CODE        0x1bf
  92 #define TEXTURE_SNR_LAYER_START_CODE            0x1c0
  93
  94 /*****************************************************************************
  95  * Open: probe the packetizer and return score
  96  *****************************************************************************/
  97 static int Open( vlc_object_t *p_this )
  98 {
  99     decoder_t     *p_dec = (decoder_t*)p_this;
 100     decoder_sys_t *p_sys;
 101
 102     switch( p_dec->fmt_in.i_codec )
 103     {
 104         case VLC_FOURCC( 'm', '4', 's', '2'):
 105         case VLC_FOURCC( 'M', '4', 'S', '2'):
 106         case VLC_FOURCC( 'm', 'p', '4', 's'):
 107         case VLC_FOURCC( 'M', 'P', '4', 'S'):
 108         case VLC_FOURCC( 'm', 'p', '4', 'v'):
 109         case VLC_FOURCC( 'D', 'I', 'V', 'X'):
 110         case VLC_FOURCC( 'd', 'i', 'v', 'x'):
 111         case VLC_FOURCC( 'X', 'V', 'I', 'D'):
 112         case VLC_FOURCC( 'X', 'v', 'i', 'D'):
 113         case VLC_FOURCC( 'x', 'v', 'i', 'd'):
 114         case VLC_FOURCC( 'D', 'X', '5', '0'):
 115         case VLC_FOURCC( 'd', 'x', '5', '0'):
 116         case VLC_FOURCC( 0x04, 0,   0,   0):
 117         case VLC_FOURCC( '3', 'I', 'V', '2'):
 118             break;
 119
 120         default:
 121             return VLC_EGENERIC;
 122     }
 123
 124     /* Allocate the memory needed to store the decoder's structure */
 125     if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
 126     {
 127         msg_Err( p_dec, "out of memory" );
 128         return VLC_EGENERIC;
 129     }
 130     p_sys->i_pts = 0;
 131     p_sys->b_vop = VLC_FALSE;
 132     p_sys->i_buffer = 0;
 133     p_sys->i_buffer_size = 0;
 134     p_sys->p_buffer = 0;
 135     p_sys->i_flags = 0;
 136
 137     /* Setup properties */
 138     p_dec->fmt_out = p_dec->fmt_in;
 139     p_dec->fmt_out.i_codec = VLC_FOURCC( 'm', 'p', '4', 'v' );
 140
 141     if( p_dec->fmt_in.i_extra )
 142     {
 143         /* We have a vol */
 144         p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
 145         p_dec->fmt_out.p_extra = malloc( p_dec->fmt_in.i_extra );
 146         memcpy( p_dec->fmt_out.p_extra, p_dec->fmt_in.p_extra,
 147                 p_dec->fmt_in.i_extra );
 148
 149         msg_Dbg( p_dec, "opening with vol size:%d", p_dec->fmt_in.i_extra );
 150         m4v_VOLParse( &p_dec->fmt_out,
 151                       p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
 152     }
 153     else
 154     {
 155         /* No vol, we'll have to look for one later on */
 156         p_dec->fmt_out.i_extra = 0;
 157         p_dec->fmt_out.p_extra = 0;
 158     }
 159
 160     /* Set callback */
 161     p_dec->pf_packetize = Packetize;
 162
 163     return VLC_SUCCESS;
 164 }
 165
 166 /*****************************************************************************
 167  * Close: clean up the packetizer
 168  *****************************************************************************/
 169 static void Close( vlc_object_t *p_this )
 170 {
 171     decoder_t *p_dec = (decoder_t*)p_this;
 172
 173     if( p_dec->p_sys->p_buffer ) free( p_dec->p_sys->p_buffer );
 174     free( p_dec->p_sys );
 175 }
 176
 177 /****************************************************************************
 178  * Packetize: the whole thing
 179  ****************************************************************************/
 180 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
 181 {
 182     decoder_sys_t *p_sys = p_dec->p_sys;
 183
 184     block_t *p_chain_out = NULL;
 185     block_t *p_block;
 186     uint8_t *p_vol = NULL;
 187     uint8_t *p_start;
 188
 189     if( !pp_block || !*pp_block ) return NULL;
 190
 191     p_block = *pp_block;
 192
 193     /* Append data */
 194     if( p_sys->i_buffer + p_block->i_buffer > p_sys->i_buffer_size )
 195     {
 196         p_sys->i_buffer_size += p_block->i_buffer + 1024;
 197         p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
 198     }
 199     memcpy( &p_sys->p_buffer[p_sys->i_buffer], p_block->p_buffer,
 200             p_block->i_buffer );
 201     p_sys->i_buffer += p_block->i_buffer;
 202
 203     if( p_sys->i_buffer > 10*1000000 )
 204     {
 205         msg_Err( p_dec, "mmh reseting context" );
 206         p_sys->i_buffer = 0;
 207     }
 208
 209     /* Search vop */
 210     p_start = &p_sys->p_buffer[p_sys->i_buffer - p_block->i_buffer - 4];
 211     if( p_start < p_sys->p_buffer )
 212     {
 213         p_start = p_sys->p_buffer;
 214     }
 215     for( ;; )
 216     {
 217         if( m4v_FindStartCode( &p_start, &p_sys->p_buffer[p_sys->i_buffer] ) )
 218         {
 219             block_Release( p_block );
 220             *pp_block = NULL;
 221             return p_chain_out;
 222         }
 223         /* fprintf( stderr, "start code=0x1%2.2x\n", p_start[3] ); */
 224
 225         if( p_vol )
 226         {
 227             /* Copy the complete VOL */
 228             p_dec->fmt_out.i_extra = p_start - p_vol;
 229             p_dec->fmt_out.p_extra = malloc( p_dec->fmt_out.i_extra );
 230             memcpy( p_dec->fmt_out.p_extra, p_vol, p_dec->fmt_out.i_extra );
 231             m4v_VOLParse( &p_dec->fmt_out,
 232                           p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
 233
 234             p_vol = NULL;
 235         }
 236         if( p_sys->b_vop )
 237         {
 238             /* Output the complete VOP we have */
 239             int     i_out = p_start - p_sys->p_buffer;
 240             block_t *p_out = block_New( p_dec, i_out );
 241
 242             /* extract data */
 243             memcpy( p_out->p_buffer, p_sys->p_buffer, i_out );
 244             if( i_out < p_sys->i_buffer )
 245             {
 246                 memmove( p_sys->p_buffer, &p_sys->p_buffer[i_out],
 247                          p_sys->i_buffer - i_out );
 248             }
 249             p_sys->i_buffer -= i_out;
 250             p_start -= i_out;
 251
 252             p_out->i_flags = p_sys->i_flags;
 253
 254             /* FIXME do proper dts/pts */
 255             p_out->i_pts = p_sys->i_pts;
 256             p_out->i_dts = p_sys->i_dts;
 257             /* FIXME doesn't work when there is multiple VOP in one block */
 258             if( p_block->i_dts > p_sys->i_dts )
 259             {
 260                 p_out->i_length = p_block->i_dts - p_sys->i_dts;
 261             }
 262
 263             if( p_dec->fmt_out.i_extra > 0 )
 264             {
 265                 block_ChainAppend( &p_chain_out, p_out );
 266             }
 267             else
 268             {
 269                 msg_Warn( p_dec, "waiting for VOL" );
 270                 block_Release( p_out );
 271             }
 272
 273 #if 0
 274             fprintf( stderr, "pts=%lld dts=%lld length=%lldms\n",
 275                      p_out->i_pts, p_out->i_dts,
 276                      p_out->i_length / 1000 );
 277 #endif
 278             p_sys->b_vop = VLC_FALSE;
 279         }
 280
 281         if( p_start[3] >= 0x20 && p_start[3] <= 0x2f )
 282         {
 283             /* Start of the VOL */
 284             p_vol = p_start;
 285         }
 286         else if( p_start[3] == 0xb6 )
 287         {
 288             p_sys->b_vop = VLC_TRUE;
 289             switch( p_start[4] >> 6 )
 290             {
 291                 case 0:
 292                     p_sys->i_flags = BLOCK_FLAG_TYPE_I;
 293                     break;
 294                 case 1:
 295                     p_sys->i_flags = BLOCK_FLAG_TYPE_P;
 296                     break;
 297                 case 2:
 298                     p_sys->i_flags = BLOCK_FLAG_TYPE_P;
 299                     break;
 300                 case 3: /* gni ? */
 301                     p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
 302                     break;
 303             }
 304
 305             /* The pts information is not available in all the containers.
 306              * FIXME: calculate the pts correctly */
 307             if( p_block->i_pts > 0 )
 308             {
 309                 p_sys->i_pts = p_block->i_pts;
 310             }
 311             else
 312             {
 313                 p_sys->i_pts = p_block->i_dts;
 314             }
 315             if( p_block->i_dts > 0 )
 316             {
 317                 p_sys->i_dts = p_block->i_dts;
 318             }
 319         }
 320         p_start += 4; /* Next */
 321     }
 322 }
 323
 324 /****************************************************************************
 325  * m4v_FindStartCode
 326  ****************************************************************************/
 327 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
 328 {
 329     uint8_t *p = *pp_start;
 330
 331     /* We wait for 4+1 bytes */
 332     for( p = *pp_start; p < p_end - 5; p++ )
 333     {
 334         if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
 335         {
 336             *pp_start = p;
 337             return VLC_SUCCESS;
 338         }
 339     }
 340
 341     *pp_start = p_end;
 342     return VLC_EGENERIC;
 343 }
 344
 345
 346 /* look at ffmpeg av_log2 ;) */
 347 static int vlc_log2( unsigned int v )
 348 {
 349     int n = 0;
 350     static const int vlc_log2_table[16] =
 351     {
 352         0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
 353     };
 354
 355     if( v&0xffff0000 )
 356     {
 357         v >>= 16;
 358         n += 16;
 359     }
 360     if( v&0xff00 )
 361     {
 362         v >>= 8;
 363         n += 8;
 364     }
 365     if( v&0xf0 )
 366     {
 367         v >>= 4;
 368         n += 4;
 369     }
 370     n += vlc_log2_table[v];
 371
 372     return n;
 373 }
 374
 375 /* m4v_VOLParse:
 376  *  TODO:
 377  *      - support aspect ratio
 378  */
 379 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol )
 380 {
 381     bs_t s;
 382     int i_vo_type;
 383     int i_vo_ver_id;
 384     int i_ar;
 385     int i_shape;
 386     int i_time_increment_resolution;
 387
 388     for( ;; )
 389     {
 390         if( p_vol[0] == 0x00 && p_vol[1] == 0x00 &&
 391             p_vol[2] == 0x01 &&
 392             p_vol[3] >= 0x20 && p_vol[3] <= 0x2f )
 393         {
 394             break;
 395         }
 396         p_vol++;
 397         i_vol--;
 398         if( i_vol <= 4 )
 399         {
 400             return VLC_EGENERIC;
 401         }
 402     }
 403
 404     /* parse the vol */
 405     bs_init( &s, &p_vol[4], i_vol - 4 );
 406
 407     bs_skip( &s, 1 );   /* random access */
 408     i_vo_type = bs_read( &s, 8 );
 409     if( bs_read1( &s ) )
 410     {
 411         i_vo_ver_id = bs_read( &s, 4 );
 412         bs_skip( &s, 3 );
 413     }
 414     else
 415     {
 416         i_vo_ver_id = 1;
 417     }
 418     i_ar = bs_read( &s, 4 );
 419     if( i_ar == 0xf )
 420     {
 421         int i_ar_width, i_ar_height;
 422
 423         i_ar_width = bs_read( &s, 8 );
 424         i_ar_height= bs_read( &s, 8 );
 425     }
 426     if( bs_read1( &s ) )
 427     {
 428         int i_chroma_format;
 429         int i_low_delay;
 430
 431         /* vol control parameter */
 432         i_chroma_format = bs_read( &s, 2 );
 433         i_low_delay = bs_read1( &s );
 434
 435         if( bs_read1( &s ) )
 436         {
 437             bs_skip( &s, 16 );
 438             bs_skip( &s, 16 );
 439             bs_skip( &s, 16 );
 440             bs_skip( &s, 3 );
 441             bs_skip( &s, 11 );
 442             bs_skip( &s, 1 );
 443             bs_skip( &s, 16 );
 444         }
 445     }
 446     /* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
 447     i_shape = bs_read( &s, 2 );
 448     if( i_shape == 3 && i_vo_ver_id != 1 )
 449     {
 450         bs_skip( &s, 4 );
 451     }
 452
 453     if( !bs_read1( &s ) )
 454     {
 455         /* marker */
 456         return VLC_EGENERIC;
 457     }
 458     i_time_increment_resolution = bs_read( &s, 16 );
 459     if( !bs_read1( &s ) )
 460     {
 461         /* marker */
 462         return VLC_EGENERIC;
 463     }
 464
 465     if( bs_read1( &s ) )
 466     {
 467         int i_time_increment_bits = vlc_log2( i_time_increment_resolution - 1 ) + 1;
 468         if( i_time_increment_bits < 1 )
 469         {
 470             i_time_increment_bits = 1;
 471         }
 472         bs_skip( &s, i_time_increment_bits );
 473     }
 474     if( i_shape == 0 )
 475     {
 476         bs_skip( &s, 1 );
 477         fmt->video.i_width = bs_read( &s, 13 );
 478         bs_skip( &s, 1 );
 479         fmt->video.i_height= bs_read( &s, 13 );
 480         bs_skip( &s, 1 );
 481     }
 482     return VLC_SUCCESS;
 483 }
 484
 485
 486