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 1.7 2003/01/22 04:51:16 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_input_t            *p_sout_input;
  48     sout_packet_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
 161     p_pack->p_sout_input = NULL;
 162
 163     if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
 164                        NULL, NULL ) != VLC_SUCCESS )
 165     {
 166         msg_Err( p_pack->p_fifo, "cannot initialize bitstream" );
 167         return -1;
 168     }
 169
 170     p_pack->i_last_picture_structure = 0x03; /* frame picture */
 171     return( 0 );
 172 }
 173
 174 /* from ISO 13818-2 */
 175 /* converting frame_rate_code to frame_rate */
 176 static const double pd_frame_rates[16] =
 177 {
 178     0, 24000/1001, 24, 25, 30000/1001, 30, 50, 60000/1001, 60,
 179     0, 0, 0, 0, 0, 0, 0
 180 };
 181
 182 static int CopyUntilNextStartCode( packetizer_t   *p_pack,
 183                                    sout_buffer_t  *p_sout_buffer,
 184                                    int            *pi_pos )
 185 {
 186     int i_copy = 0;
 187
 188     do
 189     {
 190         p_sout_buffer->p_buffer[(*pi_pos)++] =
 191                 GetBits( &p_pack->bit_stream, 8 );
 192         i_copy++;
 193
 194         if( *pi_pos + 2048 > p_sout_buffer->i_buffer_size )
 195         {
 196             sout_BufferRealloc( p_pack->p_sout_input->p_sout,
 197                                 p_sout_buffer,
 198                                 p_sout_buffer->i_buffer_size + 50 * 1024);
 199         }
 200
 201     } while( ShowBits( &p_pack->bit_stream, 24 ) != 0x01 &&
 202              !p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error );
 203
 204     return( i_copy );
 205 }
 206
 207 /*****************************************************************************
 208  * PacketizeThread: packetize an unit (here copy a complete pes)
 209  *****************************************************************************/
 210 static void PacketizeThread( packetizer_t *p_pack )
 211 {
 212     sout_buffer_t *p_sout_buffer = NULL;
 213     int32_t i_pos;
 214     int i_skipped;
 215     mtime_t i_duration; /* of the parsed picture */
 216
 217     /* needed to calculate pts/dts */
 218     int i_temporal_ref = 0;
 219     int i_picture_structure = 0x03; /* frame picture */
 220     int i_top_field_first = 0;
 221     int i_repeat_first_field = 0;
 222
 223     if( !p_pack->p_sout_input )
 224     {
 225         byte_t p_temp[512];/* 150 bytes is the maximal size
 226                                of a sequence_header + sequence_extension */
 227         int i_frame_rate_code;
 228         BITMAPINFOHEADER *p_bih;
 229
 230         p_bih = malloc( sizeof( BITMAPINFOHEADER ) );
 231         p_pack->output_format.p_format = (void*)p_bih;
 232
 233         /* skip data until we find a sequence_header_code */
 234         /* TODO: store skipped somewhere so can send it to the mux
 235          * after the input is created */
 236         i_skipped = 0;
 237         while( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B3 )
 238         {
 239             RemoveBits( &p_pack->bit_stream, 8 );
 240             i_skipped++;
 241         }
 242         msg_Warn( p_pack->p_fifo, "sequence_header_code found (%d skipped)",
 243                  i_skipped );
 244
 245         /* copy the start_code */
 246         i_pos = 0;
 247         GetChunk( &p_pack->bit_stream, p_temp, 4 ); i_pos += 4;
 248
 249         p_bih->biSize = sizeof( BITMAPINFOHEADER );
 250         /* horizontal_size_value */
 251         p_bih->biWidth = ShowBits( &p_pack->bit_stream, 12 );
 252         /* vertical_size_value */
 253         p_bih->biHeight = ShowBits( &p_pack->bit_stream, 24 ) & 0xFFF;
 254         /* frame_rate_code */
 255         i_frame_rate_code = ShowBits( &p_pack->bit_stream, 32 ) & 0xF;
 256         p_bih->biPlanes = 1;
 257         p_bih->biBitCount = 0;
 258         p_bih->biCompression = VLC_FOURCC( 'm', 'p', 'g', '2' );
 259         p_bih->biSizeImage = 0;
 260         p_bih->biXPelsPerMeter = 0;
 261         p_bih->biYPelsPerMeter = 0;
 262         p_bih->biClrUsed = 0;
 263         p_bih->biClrImportant = 0;
 264
 265         /* copy headers */
 266         GetChunk( &p_pack->bit_stream, p_temp + i_pos, 7 ); i_pos += 7;
 267
 268         /* intra_quantiser_matrix [non_intra_quantiser_matrix] */
 269         if( ShowBits( &p_pack->bit_stream, 7 ) & 0x1 )
 270         {
 271
 272             GetChunk( &p_pack->bit_stream, p_temp + i_pos, 64 ); i_pos += 64;
 273
 274             if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
 275             {
 276                 GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
 277             }
 278         }
 279         /* non_intra_quantiser_matrix */
 280         else if( ShowBits( &p_pack->bit_stream, 8 ) & 0x1 )
 281         {
 282             GetChunk( &p_pack->bit_stream, p_temp + i_pos, 65); i_pos += 65;
 283         }
 284         /* nothing */
 285         else
 286         {
 287             GetChunk( &p_pack->bit_stream, p_temp + i_pos, 1 ); i_pos += 1;
 288         }
 289
 290         /* sequence_extension (10 bytes) */
 291         if( ShowBits( &p_pack->bit_stream, 32 ) != 0x1B5 )
 292         {
 293             msg_Dbg( p_pack->p_fifo, "ARRGG no extension_start_code" );
 294             p_pack->i_progressive_sequence = 1;
 295         }
 296         else
 297         {
 298             GetChunk( &p_pack->bit_stream, p_temp + i_pos, 10 );
 299             p_pack->i_progressive_sequence = ( p_temp[i_pos+5]&0x08 ) ? 1 : 0;
 300
 301             i_pos += 10;
 302         }
 303
 304         /* remember sequence_header and sequence_extention */
 305         memcpy( p_pack->p_sequence_header, p_temp, i_pos );
 306         p_pack->i_sequence_header_length = i_pos;
 307
 308         p_pack->d_frame_rate =  pd_frame_rates[i_frame_rate_code];
 309
 310         msg_Warn( p_pack->p_fifo,
 311                   "creating input (image size %dx%d, frame rate %.2f)",
 312                   p_bih->biWidth, p_bih->biHeight, 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             return;
 322         }
 323
 324         p_sout_buffer = sout_BufferNew( p_pack->p_sout_input->p_sout,
 325                                         100 * 1024 );
 326         p_sout_buffer->i_size = i_pos;
 327         memcpy( p_sout_buffer->p_buffer, p_temp, i_pos );
 328
 329     }
 330     else
 331     {
 332         p_sout_buffer =
 333                 sout_BufferNew( p_pack->p_sout_input->p_sout, 100 * 1024 );
 334         i_pos = 0;
 335     }
 336
 337     p_pack->i_last_sequence_header++;
 338
 339     for( ;; )
 340     {
 341         uint32_t i_code;
 342         if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
 343         {
 344             break;
 345         }
 346
 347         i_code = ShowBits( &p_pack->bit_stream, 32 );
 348
 349         if( i_code == 0x1B8 ) /* GOP */
 350         {
 351             /* usefull for bad MPEG-1 : repeat the sequence_header
 352                every second */
 353             if( p_pack->i_last_sequence_header > (int) p_pack->d_frame_rate )
 354             {
 355                memcpy( p_sout_buffer->p_buffer + i_pos,
 356                        p_pack->p_sequence_header,
 357                        p_pack->i_sequence_header_length );
 358                i_pos += p_pack->i_sequence_header_length;
 359                p_pack->i_last_sequence_header = 0;
 360             }
 361
 362             p_pack->i_last_ref_pts =
 363                    p_pack->i_last_dts + 40000; /* FIXME */
 364             CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
 365         }
 366         else if( i_code == 0x100 ) /* Picture */
 367         {
 368             /* picture_start_code */
 369             GetChunk( &p_pack->bit_stream,
 370                       p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
 371             i_temporal_ref = ShowBits( &p_pack->bit_stream, 10 );
 372
 373             CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
 374             break;
 375         }
 376         else if( i_code == 0x1b5 )
 377         {
 378             /* extention start code                   32 */
 379             GetChunk( &p_pack->bit_stream,
 380                       p_sout_buffer->p_buffer + i_pos, 4 ); i_pos += 4;
 381
 382             if( ShowBits( &p_pack->bit_stream, 4 ) == 0x08 )
 383             {
 384                 /* picture coding extention */
 385
 386                 /* extention start code identifier(b1000)  4 */
 387                 /* f_code[2][2]                           16 */
 388                 /* intra_dc_precision                      2 */
 389                 /* picture_structure                       2 */
 390                 /* top_field_first                         1 */
 391                 i_picture_structure =
 392                     ShowBits( &p_pack->bit_stream, 24 ) & 0x03;
 393                 i_top_field_first =
 394                     ShowBits( &p_pack->bit_stream, 25 ) & 0x01;
 395                 i_repeat_first_field =
 396                     ShowBits( &p_pack->bit_stream, 31 ) & 0x01;
 397             }
 398             CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
 399         }
 400         else
 401         {
 402             if( i_code == 0x1B3 )
 403             {
 404                 p_pack->i_last_sequence_header = 0;
 405             }
 406             CopyUntilNextStartCode( p_pack, p_sout_buffer, &i_pos );
 407         }
 408     }
 409
 410     sout_BufferRealloc( p_pack->p_sout_input->p_sout,
 411                         p_sout_buffer, i_pos );
 412     p_sout_buffer->i_size = i_pos;
 413
 414     /* calculate dts/pts */
 415     if( p_pack->i_progressive_sequence || i_picture_structure == 0x03)
 416     {
 417         i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate );
 418     }
 419     else
 420     {
 421         i_duration = (mtime_t)( 1000000 / p_pack->d_frame_rate / 2);
 422     }
 423
 424     p_sout_buffer->i_dts = p_pack->i_last_dts;
 425     p_sout_buffer->i_pts = p_pack->i_last_ref_pts +
 426         i_temporal_ref * (mtime_t)( 1000000 / p_pack->d_frame_rate );
 427     p_sout_buffer->i_length = i_duration;
 428     p_sout_buffer->i_bitrate = (int)( 8 * i_pos * p_pack->d_frame_rate );
 429     sout_InputSendBuffer( p_pack->p_sout_input, p_sout_buffer );
 430
 431     if( p_pack->i_progressive_sequence )
 432     {
 433         if( i_top_field_first == 0 && i_repeat_first_field == 0 )
 434         {
 435             p_pack->i_last_dts += i_duration;
 436         }
 437         else if( i_top_field_first == 0 && i_repeat_first_field == 1 )
 438         {
 439             p_pack->i_last_dts += 2 * i_duration;
 440         }
 441         else if( i_top_field_first == 1 && i_repeat_first_field == 1 )
 442         {
 443             p_pack->i_last_dts += 3 * i_duration;
 444         }
 445     }
 446     else
 447     {
 448         if( i_picture_structure == 0x03 )
 449         {
 450             p_pack->i_last_dts += i_duration;
 451         }
 452         else if( i_picture_structure == p_pack->i_last_picture_structure )
 453         {
 454             p_pack->i_last_dts += 2 * i_duration;
 455         }
 456         else if( ( !i_top_field_first && i_picture_structure == 0x01 ) ||
 457                  (  i_top_field_first && i_picture_structure == 0x02 ) )
 458         {
 459             p_pack->i_last_dts += 2 * i_duration;
 460         }
 461     }
 462     p_pack->i_last_picture_structure = i_picture_structure;
 463 }
 464
 465
 466 /*****************************************************************************
 467  * EndThread : packetizer thread destruction
 468  *****************************************************************************/
 469 static void EndThread ( packetizer_t *p_pack)
 470 {
 471     if( p_pack->p_sout_input )
 472     {
 473         sout_InputDelete( p_pack->p_sout_input );
 474     }
 475 }