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     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 = malloc( p_dec->fmt_out.i_extra );
 236             memcpy( p_dec->fmt_out.p_extra, p_vol, p_dec->fmt_out.i_extra );
 237             m4v_VOLParse( &p_dec->fmt_out,
 238                           p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
 239
 240             p_vol = NULL;
 241         }
 242         if( p_sys->b_vop )
 243         {
 244             /* Output the complete VOP we have */
 245             int     i_out = p_start - p_sys->p_buffer;
 246             block_t *p_out = block_New( p_dec, i_out );
 247
 248             /* extract data */
 249             memcpy( p_out->p_buffer, p_sys->p_buffer, i_out );
 250             if( i_out < p_sys->i_buffer )
 251             {
 252                 memmove( p_sys->p_buffer, &p_sys->p_buffer[i_out],
 253                          p_sys->i_buffer - i_out );
 254             }
 255             p_sys->i_buffer -= i_out;
 256             p_start -= i_out;
 257
 258             p_out->i_flags = p_sys->i_flags;
 259
 260             /* FIXME do proper dts/pts */
 261             p_out->i_pts = p_sys->i_pts;
 262             p_out->i_dts = p_sys->i_dts;
 263             /* FIXME doesn't work when there is multiple VOP in one block */
 264             if( p_block->i_dts > p_sys->i_dts )
 265             {
 266                 p_out->i_length = p_block->i_dts - p_sys->i_dts;
 267             }
 268
 269             if( p_dec->fmt_out.i_extra > 0 )
 270             {
 271                 block_ChainAppend( &p_chain_out, p_out );
 272             }
 273             else
 274             {
 275                 msg_Warn( p_dec, "waiting for VOL" );
 276                 block_Release( p_out );
 277             }
 278
 279 #if 0
 280             fprintf( stderr, "pts=%lld dts=%lld length=%lldms\n",
 281                      p_out->i_pts, p_out->i_dts,
 282                      p_out->i_length / 1000 );
 283 #endif
 284             p_sys->b_vop = VLC_FALSE;
 285         }
 286
 287         if( p_start[3] >= 0x20 && p_start[3] <= 0x2f )
 288         {
 289             /* Start of the VOL */
 290             p_vol = p_start;
 291         }
 292         else if( p_start[3] == 0xb6 )
 293         {
 294             p_sys->b_vop = VLC_TRUE;
 295             switch( p_start[4] >> 6 )
 296             {
 297                 case 0:
 298                     p_sys->i_flags = BLOCK_FLAG_TYPE_I;
 299                     break;
 300                 case 1:
 301                     p_sys->i_flags = BLOCK_FLAG_TYPE_P;
 302                     break;
 303                 case 2:
 304                     p_sys->i_flags = BLOCK_FLAG_TYPE_B;
 305                     p_sys->b_frame = VLC_TRUE;
 306                     break;
 307                 case 3: /* gni ? */
 308                     p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
 309                     break;
 310             }
 311
 312             /* The pts information is not available in all the containers.
 313              * FIXME: calculate the pts correctly */
 314             if( p_block->i_pts > 0 )
 315             {
 316                 p_sys->i_pts = p_block->i_pts;
 317             }
 318             else if( (p_sys->i_flags&BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
 319             {
 320                 p_sys->i_pts = p_block->i_dts;
 321             }
 322             else
 323             {
 324                 p_sys->i_pts = 0;
 325             }
 326             if( p_block->i_dts > 0 )
 327             {
 328                 p_sys->i_dts = p_block->i_dts;
 329             }
 330             else if( p_sys->i_dts > 0 )
 331             {
 332                 /* XXX KLUDGE immonde, else transcode won't work */
 333                 p_sys->i_dts += 1000;
 334             }
 335         }
 336         p_start += 4; /* Next */
 337     }
 338 }
 339
 340 /****************************************************************************
 341  * m4v_FindStartCode
 342  ****************************************************************************/
 343 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
 344 {
 345     uint8_t *p = *pp_start;
 346
 347     /* We wait for 4+1 bytes */
 348     for( p = *pp_start; p < p_end - 5; p++ )
 349     {
 350         if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
 351         {
 352             *pp_start = p;
 353             return VLC_SUCCESS;
 354         }
 355     }
 356
 357     *pp_start = p_end;
 358     return VLC_EGENERIC;
 359 }
 360
 361
 362 /* look at ffmpeg av_log2 ;) */
 363 static int vlc_log2( unsigned int v )
 364 {
 365     int n = 0;
 366     static const int vlc_log2_table[16] =
 367     {
 368         0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
 369     };
 370
 371     if( v&0xffff0000 )
 372     {
 373         v >>= 16;
 374         n += 16;
 375     }
 376     if( v&0xff00 )
 377     {
 378         v >>= 8;
 379         n += 8;
 380     }
 381     if( v&0xf0 )
 382     {
 383         v >>= 4;
 384         n += 4;
 385     }
 386     n += vlc_log2_table[v];
 387
 388     return n;
 389 }
 390
 391 /* m4v_VOLParse:
 392  *  TODO:
 393  *      - support aspect ratio
 394  */
 395 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol )
 396 {
 397     bs_t s;
 398     int i_vo_type;
 399     int i_vo_ver_id;
 400     int i_ar;
 401     int i_shape;
 402     int i_time_increment_resolution;
 403
 404     for( ;; )
 405     {
 406         if( p_vol[0] == 0x00 && p_vol[1] == 0x00 &&
 407             p_vol[2] == 0x01 &&
 408             p_vol[3] >= 0x20 && p_vol[3] <= 0x2f )
 409         {
 410             break;
 411         }
 412         p_vol++;
 413         i_vol--;
 414         if( i_vol <= 4 )
 415         {
 416             return VLC_EGENERIC;
 417         }
 418     }
 419
 420     /* parse the vol */
 421     bs_init( &s, &p_vol[4], i_vol - 4 );
 422
 423     bs_skip( &s, 1 );   /* random access */
 424     i_vo_type = bs_read( &s, 8 );
 425     if( bs_read1( &s ) )
 426     {
 427         i_vo_ver_id = bs_read( &s, 4 );
 428         bs_skip( &s, 3 );
 429     }
 430     else
 431     {
 432         i_vo_ver_id = 1;
 433     }
 434     i_ar = bs_read( &s, 4 );
 435     if( i_ar == 0xf )
 436     {
 437         int i_ar_width, i_ar_height;
 438
 439         i_ar_width = bs_read( &s, 8 );
 440         i_ar_height= bs_read( &s, 8 );
 441     }
 442     if( bs_read1( &s ) )
 443     {
 444         int i_chroma_format;
 445         int i_low_delay;
 446
 447         /* vol control parameter */
 448         i_chroma_format = bs_read( &s, 2 );
 449         i_low_delay = bs_read1( &s );
 450
 451         if( bs_read1( &s ) )
 452         {
 453             bs_skip( &s, 16 );
 454             bs_skip( &s, 16 );
 455             bs_skip( &s, 16 );
 456             bs_skip( &s, 3 );
 457             bs_skip( &s, 11 );
 458             bs_skip( &s, 1 );
 459             bs_skip( &s, 16 );
 460         }
 461     }
 462     /* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
 463     i_shape = bs_read( &s, 2 );
 464     if( i_shape == 3 && i_vo_ver_id != 1 )
 465     {
 466         bs_skip( &s, 4 );
 467     }
 468
 469     if( !bs_read1( &s ) )
 470     {
 471         /* marker */
 472         return VLC_EGENERIC;
 473     }
 474     i_time_increment_resolution = bs_read( &s, 16 );
 475     if( !bs_read1( &s ) )
 476     {
 477         /* marker */
 478         return VLC_EGENERIC;
 479     }
 480
 481     if( bs_read1( &s ) )
 482     {
 483         int i_time_increment_bits = vlc_log2( i_time_increment_resolution - 1 ) + 1;
 484         if( i_time_increment_bits < 1 )
 485         {
 486             i_time_increment_bits = 1;
 487         }
 488         bs_skip( &s, i_time_increment_bits );
 489     }
 490     if( i_shape == 0 )
 491     {
 492         bs_skip( &s, 1 );
 493         fmt->video.i_width = bs_read( &s, 13 );
 494         bs_skip( &s, 1 );
 495         fmt->video.i_height= bs_read( &s, 13 );
 496         bs_skip( &s, 1 );
 497     }
 498     return VLC_SUCCESS;
 499 }
 500
 501
 502