git.sesse.net Git - vlc/blob - modules/codec/cinepak/cinepak.c

   1 /*****************************************************************************
   2  * cinepak.c: cinepak video decoder
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   5  * $Id: cinepak.c,v 1.12 2003/09/02 20:19:25 gbazin Exp $
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc/vout.h>
  31 #include <vlc/decoder.h>
  32 #include <vlc/input.h>
  33
  34 #ifdef HAVE_UNISTD_H
  35 #include <unistd.h>                                              /* getpid() */
  36 #endif
  37
  38 #include <errno.h>
  39 #include <string.h>
  40
  41 #ifdef HAVE_SYS_TIMES_H
  42 #   include <sys/times.h>
  43 #endif
  44
  45 #include "cinepak.h"
  46
  47 /*****************************************************************************
  48  * Local prototypes
  49  *****************************************************************************/
  50 static int      OpenDecoder     ( vlc_object_t * );
  51 static int      RunDecoder      ( decoder_fifo_t * );
  52 static int      InitThread      ( videodec_thread_t * );
  53 static void     EndThread       ( videodec_thread_t * );
  54 static void     DecodeThread    ( videodec_thread_t * );
  55
  56 /*****************************************************************************
  57  * Module descriptor
  58  *****************************************************************************/
  59 vlc_module_begin();
  60     set_description( _("Cinepak video decoder") );
  61     set_capability( "decoder", 70 );
  62     set_callbacks( OpenDecoder, NULL );
  63 vlc_module_end();
  64
  65 /*****************************************************************************
  66  * OpenDecoder: probe the decoder and return score
  67  *****************************************************************************
  68  * Tries to launch a decoder and return score so that the interface is able
  69  * to chose.
  70  *****************************************************************************/
  71 static int OpenDecoder( vlc_object_t *p_this )
  72 {
  73     decoder_t *p_dec = (decoder_t*)p_this;
  74
  75     switch( p_dec->p_fifo->i_fourcc )
  76     {
  77         case VLC_FOURCC('c','v','i','d'):
  78         case VLC_FOURCC('C','V','I','D'):
  79             p_dec->pf_run = RunDecoder;
  80             return VLC_SUCCESS;
  81     }
  82
  83     return VLC_EGENERIC;
  84 }
  85
  86 /*****************************************************************************
  87  * RunDecoder: this function is called just after the thread is created
  88  *****************************************************************************/
  89 static int RunDecoder( decoder_fifo_t *p_fifo )
  90 {
  91     videodec_thread_t   *p_vdec;
  92     int b_error;
  93
  94     if ( !(p_vdec = (videodec_thread_t*)malloc( sizeof(videodec_thread_t))) )
  95     {
  96         msg_Err( p_fifo, "out of memory" );
  97         DecoderError( p_fifo );
  98         return( -1 );
  99     }
 100     memset( p_vdec, 0, sizeof( videodec_thread_t ) );
 101
 102     p_vdec->p_fifo = p_fifo;
 103
 104     if( InitThread( p_vdec ) != 0 )
 105     {
 106         DecoderError( p_fifo );
 107         return( -1 );
 108     }
 109
 110     while( (!p_vdec->p_fifo->b_die) && (!p_vdec->p_fifo->b_error) )
 111     {
 112         DecodeThread( p_vdec );
 113     }
 114
 115     if( ( b_error = p_vdec->p_fifo->b_error ) )
 116     {
 117         DecoderError( p_vdec->p_fifo );
 118     }
 119
 120     EndThread( p_vdec );
 121
 122     if( b_error )
 123     {
 124         return( -1 );
 125     }
 126
 127     return( 0 );
 128 }
 129
 130
 131 /*****************************************************************************
 132  * locales Functions
 133  *****************************************************************************/
 134
 135 #define GET2BYTES( p ) \
 136     GetWBE( p ); p+= 2;
 137 /* FIXME */
 138 #define GET3BYTES( p ) \
 139     (GetDWBE( p ) >> 8); p+= 3;
 140
 141 #define GET4BYTES( p ) \
 142     GetDWBE( p ); p+= 4;
 143
 144 #define FREE( p ) \
 145     if( p ) free( p )
 146
 147
 148 static void GetPESData( u8 *p_buf, int i_max, pes_packet_t *p_pes )
 149 {
 150     int i_copy;
 151     int i_count;
 152
 153     data_packet_t   *p_data;
 154
 155     i_count = 0;
 156     p_data = p_pes->p_first;
 157     while( p_data != NULL && i_count < i_max )
 158     {
 159
 160         i_copy = __MIN( p_data->p_payload_end - p_data->p_payload_start,
 161                         i_max - i_count );
 162
 163         if( i_copy > 0 )
 164         {
 165             memcpy( p_buf,
 166                     p_data->p_payload_start,
 167                     i_copy );
 168         }
 169
 170         p_data = p_data->p_next;
 171         i_count += i_copy;
 172         p_buf   += i_copy;
 173     }
 174
 175     if( i_count < i_max )
 176     {
 177         memset( p_buf, 0, i_max - i_count );
 178     }
 179 }
 180
 181
 182 void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
 183                            u8 *p_data,
 184                            int b_grayscale )
 185 {
 186     int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
 187     int i_uv;
 188 #define SCALEBITS 12
 189 #define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
 190
 191     for( i = 0; i < 4; i++ )
 192     {
 193         i_y[i] = (u8)( *(p_data++) );
 194     }
 195     if( b_grayscale )
 196     {
 197         i_u  = (s8)( *(p_data++) );
 198         i_v  = (s8)( *(p_data++) );
 199     }
 200     else
 201     {
 202         i_u  = 0;
 203         i_v  = 0;
 204     }
 205
 206     /*
 207           | Y  |   | 1 -0.0655  0.0110 | | CY |
 208           | Cb | = | 0  1.1656 -0.0062 | | CU |
 209           | Cr |   | 0  0.0467  1.4187 | | CV |
 210      */
 211     i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
 212     for( i = 0; i < 4; i++ )
 213     {
 214         i_y[i] += i_uv;
 215     }
 216     i_Cb  = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
 217     i_Cr  = ( FIX( 0.0467 ) * i_u + FIX(  1.4187 ) * i_v ) >> SCALEBITS;
 218
 219     for( i = 0; i < 4; i++ )
 220     {
 221         p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
 222     }
 223     p_codebook->i_u  = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
 224     p_codebook->i_v  = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
 225
 226 #undef FIX
 227 #undef SCALEBITS
 228 }
 229
 230 void cinepak_Getv4( cinepak_context_t *p_context,
 231                     int i_strip,
 232                     int i_x,  int i_y,
 233                     int i_x2, int i_y2,
 234                     u8 *p_data )
 235 {
 236     u8 i_index[4];
 237     int i,j;
 238
 239     u8 *p_dst_y, *p_dst_u, *p_dst_v;
 240 #define PIX_SET_Y( x, y, v ) \
 241     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 242
 243 #define PIX_SET_UV( i, p, x, y, v ) \
 244     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 245
 246     for( i = 0; i < 4; i++ )
 247     {
 248         i_index[i] = *(p_data++);
 249     }
 250
 251     /* y plane */
 252     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 253     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 254     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 255
 256     for( i = 0; i < 2; i++ )
 257     {
 258         for( j = 0; j < 2; j ++ )
 259         {
 260             PIX_SET_Y( 2*j + 0, 2*i + 0,
 261                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[0]);
 262             PIX_SET_Y( 2*j + 1, 2*i + 0,
 263                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
 264             PIX_SET_Y( 2*j + 0, 2*i + 1,
 265                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
 266             PIX_SET_Y( 2*j + 1, 2*i + 1,
 267                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
 268
 269             PIX_SET_UV( 1, p_dst_u, j, i,
 270                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
 271             PIX_SET_UV( 2, p_dst_v, j, i,
 272                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
 273         }
 274     }
 275 #undef PIX_SET_Y
 276 #undef PIX_SET_UV
 277 }
 278
 279 void cinepak_Getv1( cinepak_context_t *p_context,
 280                     int i_strip,
 281                     int i_x,  int i_y,
 282                     int i_x2, int i_y2,
 283                     u8 *p_data )
 284 {
 285     u8 i_index;
 286     int i,j;
 287
 288     u8 *p_dst_y, *p_dst_u, *p_dst_v;
 289 #define PIX_SET_Y( x, y, v ) \
 290     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 291
 292 #define PIX_SET_UV( i,p, x, y, v ) \
 293     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 294
 295     i_index = *(p_data++);
 296
 297     /* y plane */
 298     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 299     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 300     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 301
 302     for( i = 0; i < 2; i++ )
 303     {
 304         for( j = 0; j < 2; j ++ )
 305         {
 306             PIX_SET_Y( 2*j + 0, 2*i + 0,
 307                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 308             PIX_SET_Y( 2*j + 1, 2*i + 0,
 309                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 310             PIX_SET_Y( 2*j + 0, 2*i + 1,
 311                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 312             PIX_SET_Y( 2*j + 1, 2*i + 1,
 313                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 314
 315             PIX_SET_UV( 1,p_dst_u, j, i,
 316                         p_context->codebook_v1[i_strip][i_index].i_u );
 317             PIX_SET_UV( 2,p_dst_v, j, i,
 318                         p_context->codebook_v1[i_strip][i_index].i_v );
 319         }
 320     }
 321
 322 #undef PIX_SET_Y
 323 #undef PIX_SET_UV
 324 }
 325
 326 /*****************************************************************************
 327  * The function that decode one frame
 328  *****************************************************************************/
 329 int cinepak_decode_frame( cinepak_context_t *p_context,
 330                           int i_length, u8 *p_data )
 331 {
 332     int i_strip;
 333
 334     int i_frame_flags;
 335     int i_frame_size;
 336     int i_width, i_height;
 337     int i_frame_strips;
 338     int i_index;
 339     int i_strip_x1 =0, i_strip_y1=0;
 340     int i_strip_x2 =0, i_strip_y2=0;
 341
 342     if( i_length <= 10 )
 343     {
 344         /* Broken header or no data */
 345         return( -1 );
 346     }
 347
 348     /* get header */
 349     i_frame_flags  = *(p_data++);
 350     i_frame_size = GET3BYTES( p_data );
 351     i_width  = GET2BYTES( p_data );
 352     i_height = GET2BYTES( p_data );
 353     i_frame_strips = GET2BYTES( p_data );
 354
 355     /* Check if we have a picture buffer with good size */
 356     if( ( p_context->i_width != i_width )||
 357         ( p_context->i_height != i_height ) )
 358     {
 359         int i;
 360         for( i = 0; i < 3; i++ )
 361         {
 362             FREE( p_context->p_pix[i] );
 363         }
 364
 365         p_context->i_width = i_width;
 366         p_context->i_height = i_height;
 367
 368         p_context->i_stride[0] = ( i_width + 3)&0xfffc;
 369         p_context->i_stride[1] = p_context->i_stride[2] =
 370                 p_context->i_stride[0] / 2;
 371
 372         p_context->i_lines[0] = ( i_height + 3 )&0xfffc;
 373         p_context->i_lines[1] = p_context->i_lines[2] =
 374                 p_context->i_lines[0] /2;
 375
 376         for( i = 0; i < 3; i++ )
 377         {
 378             p_context->p_pix[i] = malloc( p_context->i_stride[i] *
 379                                           p_context->i_lines[i] );
 380             /* Set it to all black */
 381             memset( p_context->p_pix[i], ( i == 0 ) ? 0 : 128 ,
 382                     p_context->i_stride[i] * p_context->i_lines[i] );
 383         }
 384     }
 385
 386     if( i_frame_size != i_length )
 387     {
 388         i_length = __MIN( i_length, i_frame_size );
 389     }
 390     i_length -= 10;
 391
 392     if( i_frame_strips >= CINEPAK_MAXSTRIP )
 393     {
 394         i_frame_strips = CINEPAK_MAXSTRIP;
 395     }
 396
 397     /* Now decode each strip */
 398
 399     for( i_strip = 0; i_strip < i_frame_strips; i_strip++ )
 400     {
 401         int i_strip_id;
 402         int i_strip_size;
 403
 404         if( i_length <= 12 )
 405         {
 406             break;
 407         }
 408
 409
 410         i_strip_id   = GET2BYTES( p_data );
 411         i_strip_size = GET2BYTES( p_data );
 412         i_strip_size = __MIN( i_strip_size, i_length );
 413         /* FIXME I don't really understand how it's work; */
 414         i_strip_y1  = i_strip_y2 + GET2BYTES( p_data );
 415         i_strip_x1  = GET2BYTES( p_data );
 416         i_strip_y2  = i_strip_y2 + GET2BYTES( p_data );
 417         i_strip_x2  = GET2BYTES( p_data );
 418
 419         i_length -= i_strip_size;
 420
 421         i_strip_size -= 12;
 422         /* init codebook , if needed */
 423         if( ( i_strip > 0 )&&( !(i_frame_flags&0x01) ) )
 424         {
 425             memcpy( &p_context->codebook_v1[i_strip],
 426                     &p_context->codebook_v1[i_strip-1],
 427                     sizeof(cinepak_codebook_t[256] ) );
 428
 429             memcpy( &p_context->codebook_v4[i_strip],
 430                     &p_context->codebook_v4[i_strip-1],
 431                     sizeof(cinepak_codebook_t[256] ) );
 432         }
 433
 434         /* Now parse all chunk in this strip */
 435         while( i_strip_size > 0 )
 436         {
 437             cinepak_codebook_t (*p_codebook)[CINEPAK_MAXSTRIP][256];
 438             int i_mode;
 439
 440             int i_chunk_id;
 441             int i_chunk_size;
 442             u32 i_vector_flags;
 443             int i_count;
 444             int i;
 445             int i_x, i_y; /* (0,0) begin in fact at (x1,y1) ... */
 446
 447             i_chunk_id   = GET2BYTES( p_data );
 448             i_chunk_size = GET2BYTES( p_data );
 449             i_chunk_size  = __MIN( i_chunk_size, i_strip_size );
 450             i_strip_size -= i_chunk_size;
 451
 452             i_chunk_size -= 4;
 453
 454             i_x = 0;
 455             i_y = 0;
 456             if( i_chunk_size < 0 )
 457             {
 458                 break;
 459             }
 460
 461             switch( i_chunk_id )
 462             {
 463                 case( 0x2000 ): /* 12bits v4 Intra*/
 464                 case( 0x2200 ): /* 12bits v1 Intra*/
 465                 case( 0x2400 ): /* 8bits v4 Intra*/
 466                 case( 0x2600 ): /* 8bits v1 Intra */
 467                     i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 468                     p_codebook = ( i_chunk_id&0x0200 ) ?
 469                                     &p_context->codebook_v1 :
 470                                     &p_context->codebook_v4;
 471
 472                     i_count = __MIN( i_chunk_size / ( i_mode ? 6 : 4 ), 256 );
 473
 474                     for( i = 0; i < i_count; i++ )
 475                     {
 476                         cinepak_LoadCodebook( &((*p_codebook)[i_strip][i]),
 477                                               p_data,
 478                                        i_mode&~p_context->b_grayscale );
 479                         p_data += i_mode ? 6 : 4;
 480                         i_chunk_size -= i_mode ? 6 : 4;
 481                     }
 482                     break;
 483
 484                 case( 0x2100 ): /* selective 12bits v4 Inter*/
 485                 case( 0x2300 ): /* selective 12bits v1 Inter*/
 486                 case( 0x2500 ): /* selective 8bits v4 Inter*/
 487                 case( 0x2700 ): /* selective 8bits v1 Inter*/
 488                     i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 489                     p_codebook = ( i_chunk_id&0x0200 ) ?
 490                                     &p_context->codebook_v1 :
 491                                     &p_context->codebook_v4;
 492
 493                     i_index = 0;
 494                     while( (i_chunk_size > 4)&&(i_index<256))
 495                     {
 496                         i_vector_flags = GET4BYTES( p_data );
 497                         i_chunk_size -= 4;
 498                         for( i = 0; i < 32; i++ )
 499                         {
 500                             if( ( i_chunk_size < ( i_mode ? 6 : 4 ) )||(i_index >= 256 ))
 501                             {
 502                                 break;
 503                             }
 504                             if( i_vector_flags&0x80000000UL )
 505                             {
 506                                 cinepak_LoadCodebook( &((*p_codebook)[i_strip][i_index]),
 507                                                       p_data,
 508                                             i_mode&~p_context->b_grayscale );
 509
 510                                 p_data += i_mode ? 6 : 4;
 511                                 i_chunk_size -= i_mode ? 6 : 4;
 512                             }
 513                             i_index++;
 514                             i_vector_flags <<= 1;
 515                         }
 516                     }
 517                     break;
 518
 519                 case( 0x3000 ): /* load image Intra */
 520                     while( (i_chunk_size >= 4 )&&(i_y<i_strip_y2-i_strip_y1) )
 521                     {
 522                         i_vector_flags = GET4BYTES( p_data );
 523                         i_chunk_size -= 4;
 524                         i_strip_size -= 4;
 525                         i_length     -= 4;
 526
 527                         for( i = 0; i < 32; i++ )
 528                         {
 529                             if( ( i_y >= i_strip_y2 - i_strip_y1)||
 530                                     ( i_chunk_size<=0) )
 531                             {
 532                                 break;
 533                             }
 534                             if( i_vector_flags&0x80000000UL )
 535                             {
 536                                 cinepak_Getv4( p_context,
 537                                                i_strip,
 538                                                i_strip_x1 + i_x,
 539                                                i_strip_y1 + i_y,
 540                                                i_strip_x2, i_strip_y2,
 541                                                p_data );
 542                                 p_data += 4;
 543                                 i_chunk_size -= 4;
 544                             }
 545                             else
 546                             {
 547                                 cinepak_Getv1( p_context,
 548                                                i_strip,
 549                                                i_strip_x1 + i_x,
 550                                                i_strip_y1 + i_y,
 551                                                i_strip_x2, i_strip_y2,
 552                                                p_data );
 553                                 p_data++;
 554                                 i_chunk_size--;
 555                             }
 556
 557                             i_x += 4;
 558                             if( i_x >= i_strip_x2 - i_strip_x1 )
 559                             {
 560                                 i_x = 0;
 561                                 i_y += 4;
 562                             }
 563                             i_vector_flags <<= 1;
 564                         }
 565                     }
 566                     break;
 567
 568                 case( 0x3100 ): /* load image Inter */
 569                     while( ( i_chunk_size > 4 )&&( i_y < i_strip_y2 - i_strip_y1) )
 570                     {
 571                         u32 i_mask;
 572                         i_vector_flags = GET4BYTES( p_data );
 573                         i_chunk_size -= 4;
 574                         i_mask = 0x80000000UL;
 575
 576                         while((i_chunk_size > 0 )&&( i_mask )&&( i_y < i_strip_y2 - i_strip_y1 ))
 577                         {
 578                             if( i_vector_flags&i_mask)
 579                             {
 580                                 i_mask >>= 1;
 581                                 if( !i_mask )
 582                                 {
 583                                     if( i_chunk_size < 4 )
 584                                     {
 585                                         break;
 586                                     }
 587                                     i_vector_flags = GET4BYTES( p_data );
 588                                     i_chunk_size -= 4;
 589                                     i_mask = 0x80000000UL;
 590                                 }
 591                                 if( i_vector_flags&i_mask )
 592                                 {
 593                                     if( i_chunk_size < 4 ) break;
 594                                     cinepak_Getv4( p_context,
 595                                                    i_strip,
 596                                                    i_strip_x1 + i_x,
 597                                                    i_strip_y1 + i_y,
 598                                                    i_strip_x2, i_strip_y2,
 599                                                    p_data );
 600                                     p_data += 4;
 601                                     i_chunk_size -= 4;
 602                                 }
 603                                 else
 604                                 {
 605                                     if( i_chunk_size < 1 ) break;
 606                                     cinepak_Getv1( p_context,
 607                                                    i_strip,
 608                                                    i_strip_x1 + i_x,
 609                                                    i_strip_y1 + i_y,
 610                                                    i_strip_x2, i_strip_y2,
 611                                                    p_data );
 612                                     p_data++;
 613                                     i_chunk_size--;
 614                                 }
 615                             }
 616                             i_mask >>= 1;
 617
 618                             i_x += 4;
 619                             if( i_x >= i_strip_x2 - i_strip_x1 )
 620                             {
 621                                 i_x = 0;
 622                                 i_y += 4;
 623                             }
 624                         }
 625                     }
 626                     break;
 627
 628                 case( 0x3200 ): /* load intra picture but all v1*/
 629                     while( ( i_chunk_size > 0 )&&
 630                            ( i_y < i_strip_y2 - i_strip_y1) )
 631                     {
 632                         cinepak_Getv1( p_context,
 633                                        i_strip,
 634                                        i_strip_x1 + i_x,
 635                                        i_strip_y1 + i_y,
 636                                        i_strip_x2, i_strip_y2,
 637                                        p_data );
 638                         p_data++;
 639                         i_chunk_size--;
 640
 641                         i_x += 4;
 642                         if( i_x >= i_strip_x2 - i_strip_x1 )
 643                         {
 644                             i_x = 0;
 645                             i_y += 4;
 646                         }
 647
 648                     }
 649                     break;
 650
 651
 652
 653                 default:
 654                     break;
 655
 656             }
 657             p_data += i_chunk_size ; /* skip remains bytes */
 658
 659         }
 660     }
 661
 662
 663     return( 0 );
 664 }
 665
 666
 667 /*****************************************************************************
 668  *
 669  * Functions that initialize, decode and end the decoding process
 670  *
 671  *****************************************************************************/
 672
 673 /*****************************************************************************
 674  * InitThread: initialize vdec output thread
 675  *****************************************************************************
 676  * This function is called from decoder_Run and performs the second step
 677  * of the initialization. It returns 0 on success. Note that the thread's
 678  * flag are not modified inside this function.
 679  *****************************************************************************/
 680
 681 static int InitThread( videodec_thread_t *p_vdec )
 682 {
 683
 684     /* This will be created after the first decoded frame */
 685     if( !(p_vdec->p_context = malloc( sizeof( cinepak_context_t ) ) ) )
 686     {
 687         msg_Err( p_vdec->p_fifo, "out of memory" );
 688     }
 689     memset( p_vdec->p_context, 0, sizeof( cinepak_context_t ) );
 690
 691     if( config_GetInt( p_vdec->p_fifo, "grayscale" ) )
 692     {
 693         p_vdec->p_context->b_grayscale = 1;
 694     }
 695     else
 696     {
 697         p_vdec->p_context->b_grayscale = 0;
 698     }
 699
 700     p_vdec->p_vout = NULL;
 701     msg_Dbg( p_vdec->p_fifo, "cinepak decoder started" );
 702     return( 0 );
 703 }
 704
 705
 706 /*****************************************************************************
 707  * DecodeThread: Called for decode one frame
 708  *****************************************************************************/
 709 static void  DecodeThread( videodec_thread_t *p_vdec )
 710 {
 711     pes_packet_t    *p_pes;
 712     int             i_frame_size;
 713
 714     int     i_status;
 715     int i_plane;
 716     u8 *p_dst, *p_src;
 717     picture_t *p_pic; /* videolan picture */
 718
 719     do
 720     {
 721         input_ExtractPES( p_vdec->p_fifo, &p_pes );
 722         if( !p_pes )
 723         {
 724             p_vdec->p_fifo->b_error = 1;
 725             return;
 726         }
 727         p_vdec->i_pts = p_pes->i_pts;
 728         i_frame_size = p_pes->i_pes_size;
 729
 730         if( i_frame_size > 0 )
 731         {
 732             if( p_vdec->i_buffer < i_frame_size + 16 )
 733             {
 734                 FREE( p_vdec->p_buffer );
 735                 p_vdec->p_buffer = malloc( i_frame_size + 16 );
 736                 p_vdec->i_buffer = i_frame_size + 16;
 737             }
 738
 739             GetPESData( p_vdec->p_buffer, p_vdec->i_buffer, p_pes );
 740         }
 741         input_DeletePES( p_vdec->p_fifo->p_packets_mgt, p_pes );
 742     } while( i_frame_size <= 0 );
 743
 744
 745     i_status = cinepak_decode_frame( p_vdec->p_context,
 746                                      i_frame_size,
 747                                      p_vdec->p_buffer );
 748
 749     if( i_status < 0 )
 750     {
 751         msg_Warn( p_vdec->p_fifo, "cannot decode one frame (%d bytes)",
 752                                   i_frame_size );
 753         return;
 754     }
 755
 756     /* Check our vout */
 757     p_vdec->p_vout = vout_Request( p_vdec->p_fifo, p_vdec->p_vout,
 758                                    p_vdec->p_context->i_width,
 759                                    p_vdec->p_context->i_height,
 760                                    VLC_FOURCC('I','4','2','0'),
 761                                    p_vdec->p_context->i_width
 762                                     * VOUT_ASPECT_FACTOR
 763                                     / p_vdec->p_context->i_height );
 764
 765     if( !p_vdec->p_vout )
 766     {
 767         msg_Err( p_vdec->p_fifo, "cannot create vout" );
 768         p_vdec->p_fifo->b_error = VLC_TRUE; /* abort */
 769         return;
 770     }
 771
 772     /* Send decoded frame to vout */
 773     while( !(p_pic = vout_CreatePicture( p_vdec->p_vout, 0, 0, 0 ) ) )
 774     {
 775         if( p_vdec->p_fifo->b_die || p_vdec->p_fifo->b_error )
 776         {
 777             return;
 778         }
 779         msleep( VOUT_OUTMEM_SLEEP );
 780     }
 781
 782     for( i_plane = 0; i_plane < 3; i_plane++ )
 783     {
 784         int i_line, i_lines;
 785
 786         p_dst = p_pic->p[i_plane].p_pixels;
 787         p_src = p_vdec->p_context->p_pix[i_plane];
 788
 789         i_lines = __MIN( p_vdec->p_context->i_lines[i_plane],
 790                          p_pic->p[i_plane].i_lines );
 791         for( i_line = 0; i_line < i_lines; i_line++ )
 792         {
 793             memcpy( p_dst,
 794                     p_src,
 795                     __MIN( p_pic->p[i_plane].i_pitch,
 796                            p_vdec->p_context->i_stride[i_plane] ) );
 797             p_dst += p_pic->p[i_plane].i_pitch;
 798             p_src += p_vdec->p_context->i_stride[i_plane];
 799         }
 800     }
 801
 802     vout_DatePicture( p_vdec->p_vout, p_pic, p_vdec->i_pts);
 803     vout_DisplayPicture( p_vdec->p_vout, p_pic );
 804
 805     return;
 806 }
 807
 808
 809 /*****************************************************************************
 810  * EndThread: thread destruction
 811  *****************************************************************************
 812  * This function is called when the thread ends after a sucessful
 813  * initialization.
 814  *****************************************************************************/
 815 static void EndThread( videodec_thread_t *p_vdec )
 816 {
 817     int i;
 818
 819     if( !p_vdec )
 820     {
 821         return;
 822     }
 823     msg_Dbg( p_vdec->p_fifo, "cinepak decoder stopped" );
 824
 825     for( i = 0; i < 3; i++ )
 826     {
 827         FREE( p_vdec->p_context->p_pix[i] );
 828     }
 829
 830     free( p_vdec->p_context );
 831
 832     /* Get rid of our video output if we have one. */
 833     vout_Request( p_vdec->p_fifo, p_vdec->p_vout, 0, 0, 0, 0 );
 834
 835     free( p_vdec );
 836 }