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

   1 /*****************************************************************************
   2  * mpegvideo.c
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002 VideoLAN
   5  * $Id: mpegvideo.c,v 1.13 2003/04/16 00:12:36 fenrir Exp $
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Eric Petit <titer@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <vlc/vlc.h>
  29 #include <vlc/decoder.h>
  30 #include <vlc/input.h>
  31 #include <vlc/sout.h>
  32 #include "codecs.h"                         /* WAVEFORMATEX BITMAPINFOHEADER */
  33
  34 #include <stdlib.h>                                      /* malloc(), free() */
  35 #include <string.h>                                              /* strdup() */
  36
  37 /*****************************************************************************
  38  * Local prototypes
  39  *****************************************************************************/
  40 typedef struct packetizer_s
  41 {
  42     /* Input properties */
  43     decoder_fifo_t          *p_fifo;
  44     bit_stream_t            bit_stream;
  45
  46     /* Output properties */
  47     sout_packetizer_input_t *p_sout_input;
  48     sout_format_t           output_format;
  49
  50     mtime_t                 i_last_dts;
  51     mtime_t                 i_last_ref_pts;
  52     double                  d_frame_rate;
  53     int                     i_progressive_sequence;
  54     uint8_t                 p_sequence_header[150];
  55     int                     i_sequence_header_length;
  56     int                     i_last_sequence_header;
  57
  58     int                     i_last_picture_structure;
  59 } packetizer_t;
  60
  61 static int  Open    ( vlc_object_t * );
  62 static int  Run     ( decoder_fifo_t * );
  63
  64 static int  InitThread     ( packetizer_t * );
  65 static void PacketizeThread   ( packetizer_t * );
  66 static void EndThread      ( packetizer_t * );
  67
  68 /*****************************************************************************
  69  * Module descriptor
  70  *****************************************************************************/
  71
  72 vlc_module_begin();
  73     set_description( _("MPEG-I/II video packetizer") );
  74     set_capability( "packetizer", 50 );
  75     set_callbacks( Open, NULL );
  76 vlc_module_end();
  77
  78 /*****************************************************************************
  79  * OpenDecoder: probe the packetizer and return score
  80  *****************************************************************************
  81  * Tries to launch a decoder and return score so that the interface is able
  82  * to choose.
  83  *****************************************************************************/
  84 static int Open( vlc_object_t *p_this )
  85 {
  86     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
  87
  88     if( p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', 'v') &&
  89         p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', '1') &&
  90         p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', '2') )
  91     {
  92         return VLC_EGENERIC;
  93     }
  94
  95     p_fifo->pf_run = Run;
  96     return VLC_SUCCESS;
  97 }
  98
  99 /*****************************************************************************
 100  * RunDecoder: this function is called just after the thread is created
 101  *****************************************************************************/
 102 static int Run( decoder_fifo_t *p_fifo )
 103 {
 104     packetizer_t *p_pack;
 105     int b_error;
 106
 107     msg_Info( p_fifo, "Running mpegvideo packetizer" );
 108     if( !( p_pack = malloc( sizeof( packetizer_t ) ) ) )
 109     {
 110         msg_Err( p_fifo, "out of memory" );
 111         DecoderError( p_fifo );
 112         return( -1 );
 113     }
 114     memset( p_pack, 0, sizeof( packetizer_t ) );
 115
 116     p_pack->p_fifo = p_fifo;
 117
 118     if( InitThread( p_pack ) != 0 )
 119     {
 120         DecoderError( p_fifo );
 121         return( -1 );
 122     }
 123
 124     while( ( !p_pack->p_fifo->b_die )&&( !p_pack->p_fifo->b_error ) )
 125     {
 126         PacketizeThread( p_pack );
 127     }
 128
 129
 130     if( ( b_error = p_pack->p_fifo->b_error ) )
 131     {
 132         DecoderError( p_pack->p_fifo );
 133     }
 134
 135     EndThread( p_pack );
 136
 137     if( p_pack )
 138     {
 139         free( p_pack );
 140     }
 141
 142     if( b_error )
 143     {
 144         return( -1 );
 145     }
 146
 147     return( 0 );
 148 }
 149
 150
 151 /*****************************************************************************
 152  * InitThread: initialize data before entering main loop
 153  *****************************************************************************/
 154
 155 static int InitThread( packetizer_t *p_pack )
 156 {
 157
 158     p_pack->output_format.i_cat = VIDEO_ES;
 159     p_pack->output_format.i_fourcc = VLC_FOURCC( 'm', 'p', 'g', 'v');
 160     p_pack->output_format.i_width  = 0;
 161     p_pack->output_format.i_height = 0;
 162     p_pack->output_format.i_bitrate= 0;
 163     p_pack->output_format.i_extra_data = 0;
 164     p_pack->output_format.p_extra_data = NULL;
 165
 166     p_pack->p_sout_input = NULL;
 167
 168     if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
 169                        NULL, NULL ) != VLC_SUCCESS )
 170     {
 171         msg_Err( p_pack->p_fifo, "cannot initialize bitstream" );
 172         return -1;
 173     }
 174
 175     p_pack->i_last_picture_structure = 0x03; /* frame picture */
 176     return( 0 );
 177 }
 178
 179 /* from ISO 13818-2 */
 180 /* converting frame_rate_code to frame_rate */
 181 static const double pd_frame_rates[16] =
 182 {
 183     0, 24000/1001, 24, 25, 30000/1001, 30, 50, 60000/1001, 60,
 184     0, 0, 0, 0, 0, 0, 0
 185 };
 186
 187 static int CopyUntilNextStartCode( packetizer_t   *p_pack,
 188                                    sout_buffer_t  *p_sout_buffer,
 189                                    unsigned int   *pi_pos )
 190 {
 191     int i_copy = 0;
 192
 193     do
 194     {
 195         p_sout_buffer->p_buffer[(*pi_pos)++] =
 196                 GetBits( &p_pack->bit_stream, 8 );
 197         i_copy++;
 198
 199         if( *pi_pos + 2048 > p_sout_buffer->i_buffer_size )
 200         {
 201             sout_BufferRealloc( p_pack->p_sout_input->p_sout,
 202                                 p_sout_buffer,
 203                                 p_sout_buffer->i_buffer_size + 50 * 1024);
 204         }
 205
 206     } while( ShowBits( &p_pack->bit_stream, 24 ) != 0x01 &&
 207              !p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error );
 208
 209     return( i_copy );
 210 }
 211
 212 /*****************************************************************************
 213  * PacketizeThread: packetize an unit (here copy a complete pes)
 214  *****************************************************************************/
 215 static void PacketizeThread( packetizer_t *p_pack )
 216 {
 217     sout_buffer_t *p_sout_buffer = NULL;
 218     vlc_bool_t    b_seen_slice = VLC_FALSE;
 219     int32_t       i_pos;
 220     int           i_skipped;
 221     mtime_t       i_duration; /* of the parsed picture */
 222
 223     mtime_t       i_pts;
 224     mtime_t       i_dts;
 225
 226     /* needed to calculate pts/dts */
 227     int i_temporal_ref = 0;
 228     int i_picture_structure = 0x03; /* frame picture */
 229     int i_top_field_first = 0;
 230     int i_repeat_first_field = 0;
 231
 232     if( !p_pack->p_sout_input )
 233     {
 234         byte_t p_temp[512];/* 150 bytes is the maximal size
 235                                of a sequence_header + sequence_extension */
 236         int i_frame_rate_code;
 237
 238
 239         /* skip data until we find a sequence_header_code */
 240         /* TODO: store skipped somewhere so can send it to the mux
 241          * after the input is created */
 242         i_skipped = 0;
 243         while( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B3 &&
 244                !p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error )
 245         {
 246             RemoveBits( &p_pack->bit_stream, 8 );
 247             i_skipped++;
 248         }
 249         msg_Warn( p_pack->p_fifo, "sequence_header_code found (%d skipped)",
 250                  i_skipped );
 251
 252         /* copy the start_code */
 253         i_pos = 0;
 254         GetChunk( &p_pack->bit_stream, p_temp, 4 ); i_pos += 4;
 255
 256         /* horizontal_size_value */
 257         p_pack->output_format.i_width = ShowBits( &p_pack->bit_stream, 12 );
 258         /* vertical_size_value */
 259         p_pack->output_format.i_height= ShowBits( &p_pack->bit_stream, 24 ) & 0xFFF;
 260         /* frame_rate_code */
 261         i_frame_rate_code = ShowBits( &p_pack->bit_stream, 32 ) & 0xF;
 262
 263         /* copy headers */
 264         GetChunk( &p_pack->bit_stream, p_temp + i_pos, 7 ); i_pos += 7;
 265
 266         /* intra_quantiser_matrix [non_intra_quantiser_matrix] */
 267         if( ShowBits( &p_pack->bit_stream, 7 ) & 0x1 )
 268         {
 269
 270             GetChunk( &p_pack->bit_stream, p_temp + i_pos, 64 ); i_pos += 64;
 271
 272             if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
 273             {
 274                 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
 275             }
 276         }
 277         /* non_intra_quantiser_matrix */
 278         else if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
 279         {
 280             GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
 281         }
 282         /* nothing */
 283         else
 284         {
 285             GetChunk( &p_pack->bit_stream, p_temp + i_pos, 1 ); i_pos += 1;
 286         }
 287
 288         /* sequence_extension (10 bytes) */
 289         if( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B5 )
 290         {
 291             msg_Dbg( p_pack->p_fifo, "ARRGG no extension_start_code" );
 292             p_pack->i_progressive_sequence = 1;
 293         }
 294         else
 295         {
 296             GetChunk( &p_pack->bit_stream, p_temp + i_pos, 10 );
 297             p_pack->i_progressive_sequence = ( p_temp[i_pos+5]&0x08 ) ? 1 : 0;
 298
 299             i_pos += 10;
 300         }
 301
 302         /* remember sequence_header and sequence_extention */
 303         memcpy( p_pack->p_sequence_header, p_temp, i_pos );
 304         p_pack->i_sequence_header_length = i_pos;
 305
 306         p_pack->d_frame_rate =  pd_frame_rates[i_frame_rate_code];
 307
 308         msg_Warn( p_pack->p_fifo,
 309                   "creating input (image size %dx%d, frame rate %.2f)",
 310                   p_pack->output_format.i_width,
 311                   p_pack->output_format.i_height,
 312                   p_pack->d_frame_rate );
 313
 314         /* now we have informations to create the input */
 315         p_pack->p_sout_input = sout_InputNew( p_pack->p_fifo,
 316                                               &p_pack->output_format );
 317
 318         if( !p_pack->p_sout_input )
 319         {
 320             msg_Err( p_pack->p_fifo, "cannot add a new stream" );
 321             p_pack->p_fifo->b_error = VLC_TRUE;
 322             return;
 323         }
 324
 325         p_sout_buffer = sout_BufferNew( p_pack->p_sout_input->p_sout,
 326                                         100 * 1024 );
 327         p_sout_buffer->i_size = i_pos;
 328         memcpy( p_sout_buffer->p_buffer, p_temp, i_pos );
 329
 330     }
 331     else
 332     {
 333         p_sout_buffer =
 334                 sout_BufferNew( p_pack->p_sout_input->p_sout, 100 * 1024 );
 335         i_pos = 0;
 336     }
 337
 338     p_pack->i_last_sequence_header++;
 339
 340     for( ;; )
 341     {
 342         uint32_t    i_code;
 343         if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
 344         {
 345             break;
 346         }
 347
 348         i_code = ShowBits( &p_pack->bit_stream, 32 );
 349
 350         if( b_seen_slice && ( i_code < 0x101 || i_code > 0x1af ) )
 351         {
 352             break;
 353         }
 354
 355         if( i_code == 0x1B8 ) /* GOP */
 356         {
 357             /* usefull for bad MPEG-1 : repeat the sequence_header
 358                every second */
 359             if( p_pack->i_last_sequence_header > (int) p_pack->d_frame_rate )
 360             {
 361                memcpy( p_sout_buffer->p_buffer + i_pos,
 362                        p_pack->p_sequence_header,
 363                        p_pack->i_sequence_header_length );
 364                i_pos += p_pack->i_sequence_header_length;
 365                p_pack->i_last_sequence_header = 0;
 366             }
 367 #if 1
 368             p_pack->i_last_ref_pts =
 369                    p_pack->i_last_dts +
 370                         (mtime_t)( 1000000 / p_pack->d_frame_rate); /* FIXME */
 371 #endif
 372             CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
 373         }
 374         else if( i_code == 0x100 ) /* Picture */
 375         {
 376             /* picture_start_code */
 377             GetChunk( &p_pack->bit_stream,
 378                       p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
 379
 380             NextPTS( &p_pack->bit_stream, &i_pts, &i_dts );
 381             i_temporal_ref = ShowBits( &p_pack->bit_stream, 10 );
 382
 383             CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
 384         }
 385         else if( i_code == 0x1b5 )
 386         {
 387             /* extention start code                   32 */
 388             GetChunk( &p_pack->bit_stream,
 389                       p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
 390
 391             if( ShowBits( &p_pack->bit_stream, 4 ) == 0x08 )
 392             {
 393                 /* picture coding extention */
 394
 395                 /* extention start code identifier(b1000)  4 */
 396                 /* f_code[2][2]                           16 */
 397                 /* intra_dc_precision                      2 */
 398                 /* picture_structure                       2 */
 399                 /* top_field_first                         1 */
 400                 i_picture_structure =
 401                     ShowBits( &p_pack->bit_stream, 24 ) & 0x03;
 402                 i_top_field_first =
 403                     ShowBits( &p_pack->bit_stream, 25 ) & 0x01;
 404                 i_repeat_first_field =
 405                     ShowBits( &p_pack->bit_stream, 31 ) & 0x01;
 406             }
 407             CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
 408         }
 409         else
 410         {
 411             if( i_code >= 0x101 && i_code <= 0x1af )
 412             {
 413                 b_seen_slice = VLC_TRUE;
 414             }
 415
 416             if( i_code == 0x1B3 )
 417             {
 418                 p_pack->i_last_sequence_header = 0;
 419             }
 420             CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
 421         }
 422     }
 423
 424     sout_BufferRealloc( p_pack->p_sout_input->p_sout,
 425                         p_sout_buffer, i_pos );
 426     p_sout_buffer->i_size = i_pos;
 427
 428     /* calculate dts/pts */
 429     if( p_pack->i_progressive_sequence || i_picture_structure == 0x03)
 430     {
 431         i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate );
 432     }
 433     else
 434     {
 435         i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate / 2);
 436     }
 437
 438     /* fix i_last_dts and i_last_ref_pts with i_dts and i_pts from stream */
 439     if( i_dts <= 0 && p_pack->i_last_dts <= 0 )
 440     {
 441         msg_Dbg( p_pack->p_fifo, "need a starting pts" );
 442         sout_BufferDelete( p_pack->p_sout_input->p_sout,
 443                            p_sout_buffer );
 444         return;
 445     }
 446
 447 #if 1
 448     if( i_dts > 0 )
 449     {
 450         //if( i_dts - p_pack->i_last_dts > 200000 ||
 451         //    i_dts - p_pack->i_last_dts < 200000 )
 452         {
 453             p_pack->i_last_dts = i_dts;
 454             if( i_pts > 0 )
 455             {
 456                 p_pack->i_last_ref_pts = i_pts -
 457                     i_temporal_ref * (mtime_t)( 1000000 / p_pack->d_frame_rate );
 458             }
 459         }
 460     }
 461 #endif
 462
 463     p_sout_buffer->i_dts = p_pack->i_last_dts;
 464     p_sout_buffer->i_pts = p_pack->i_last_ref_pts +
 465         i_temporal_ref * (mtime_t)( 1000000 / p_pack->d_frame_rate );
 466     p_sout_buffer->i_length = i_duration;
 467     p_sout_buffer->i_bitrate = (int)( 8 * i_pos * p_pack->d_frame_rate );
 468     sout_InputSendBuffer( p_pack->p_sout_input, p_sout_buffer );
 469
 470     if( p_pack->i_progressive_sequence )
 471     {
 472         if( i_top_field_first == 0 && i_repeat_first_field == 0 )
 473         {
 474             p_pack->i_last_dts += i_duration;
 475         }
 476         else if( i_top_field_first == 0 && i_repeat_first_field == 1 )
 477         {
 478             p_pack->i_last_dts += 2 * i_duration;
 479         }
 480         else if( i_top_field_first == 1 && i_repeat_first_field == 1 )
 481         {
 482             p_pack->i_last_dts += 3 * i_duration;
 483         }
 484     }
 485     else
 486     {
 487         if( i_picture_structure == 0x03 )
 488         {
 489             p_pack->i_last_dts += i_duration;
 490         }
 491         else if( i_picture_structure == p_pack->i_last_picture_structure )
 492         {
 493             p_pack->i_last_dts += 2 * i_duration;
 494         }
 495         else if( ( !i_top_field_first && i_picture_structure == 0x01 ) ||
 496                  (  i_top_field_first && i_picture_structure == 0x02 ) )
 497         {
 498             p_pack->i_last_dts += 2 * i_duration;
 499         }
 500     }
 501     p_pack->i_last_picture_structure = i_picture_structure;
 502 }
 503
 504
 505 /*****************************************************************************
 506  * EndThread : packetizer thread destruction
 507  *****************************************************************************/
 508 static void EndThread ( packetizer_t *p_pack)
 509 {
 510     if( p_pack->p_sout_input )
 511     {
 512         sout_InputDelete( p_pack->p_sout_input );
 513     }
 514 }