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

   1 /*****************************************************************************
   2  * cinepak.c: cinepak video decoder
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN (Centrale Réseaux) and its contributors
   5  * $Id$
   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 <vlc/vlc.h>
  28 #include <vlc/vout.h>
  29 #include <vlc/decoder.h>
  30
  31 /*****************************************************************************
  32  * Module descriptor
  33  *****************************************************************************/
  34 static int  OpenDecoder ( vlc_object_t * );
  35 static void CloseDecoder( vlc_object_t * );
  36
  37 vlc_module_begin();
  38     set_description( _("Cinepak video decoder") );
  39     set_capability( "decoder", 100 );
  40     set_category( CAT_INPUT );
  41     set_subcategory( SUBCAT_INPUT_VCODEC );
  42     set_callbacks( OpenDecoder, CloseDecoder );
  43 vlc_module_end();
  44
  45
  46 /*****************************************************************************
  47  * Local prototypes
  48  *****************************************************************************/
  49 #define CINEPAK_MAXSTRIP 32
  50
  51 typedef struct
  52 {
  53     uint8_t i_y[4];
  54     uint8_t i_u, i_v;
  55
  56 } cinepak_codebook_t;
  57
  58 typedef struct
  59 {
  60     int b_grayscale; /* force to grayscale */
  61
  62     int i_width;
  63     int i_height;
  64
  65     int i_stride_x;
  66     int i_stride_y;
  67
  68     uint8_t *p_y, *p_u, *p_v;
  69
  70     int i_stride[3]; /* our 3 planes */
  71     int i_lines[3];
  72     uint8_t *p_pix[3];
  73
  74     cinepak_codebook_t codebook_v1[CINEPAK_MAXSTRIP][256];
  75     cinepak_codebook_t codebook_v4[CINEPAK_MAXSTRIP][256];
  76
  77 } cinepak_context_t;
  78
  79 /*****************************************************************************
  80  * decoder_sys_t : decoder descriptor
  81  *****************************************************************************/
  82 struct decoder_sys_t
  83 {
  84     /*
  85      * Cinepak properties
  86      */
  87     cinepak_context_t context;
  88 };
  89
  90 static picture_t *DecodeBlock ( decoder_t *, block_t ** );
  91
  92 static int cinepak_decode_frame( cinepak_context_t *, int, uint8_t * );
  93
  94 /*****************************************************************************
  95  * OpenDecoder: probe the decoder and return score
  96  *****************************************************************************
  97  * Tries to launch a decoder and return score so that the interface is able
  98  * to chose.
  99  *****************************************************************************/
 100 static int OpenDecoder( vlc_object_t *p_this )
 101 {
 102     decoder_t *p_dec = (decoder_t*)p_this;
 103     decoder_sys_t *p_sys;
 104     vlc_value_t val;
 105
 106     if( p_dec->fmt_in.i_codec != VLC_FOURCC('c','v','i','d') &&
 107         p_dec->fmt_in.i_codec != VLC_FOURCC('C','V','I','D') )
 108     {
 109         return VLC_EGENERIC;
 110     }
 111
 112     /* Allocate the memory needed to store the decoder's structure */
 113     if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
 114     {
 115         msg_Err( p_dec, "out of memory" );
 116         return VLC_EGENERIC;
 117     }
 118     memset( &p_sys->context, 0, sizeof( cinepak_context_t ) );
 119
 120     var_Create( p_dec, "grayscale", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 121     var_Get( p_dec, "grayscale", &val );
 122     p_sys->context.b_grayscale = val.b_bool;
 123
 124     p_dec->pf_decode_video = DecodeBlock;
 125
 126     msg_Dbg( p_dec, "cinepak decoder started" );
 127
 128     return VLC_SUCCESS;
 129 }
 130
 131 /****************************************************************************
 132  * DecodeBlock: the whole thing
 133  ****************************************************************************
 134  * This function must be fed with whole frames.
 135  ****************************************************************************/
 136 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 137 {
 138     decoder_sys_t *p_sys = p_dec->p_sys;
 139     int i_status, i_plane;
 140     uint8_t *p_dst, *p_src;
 141     picture_t *p_pic;
 142     block_t *p_block;
 143
 144     if( !pp_block || !*pp_block )
 145     {
 146         return NULL;
 147     }
 148     p_block = *pp_block;
 149     *pp_block = NULL;
 150
 151     i_status = cinepak_decode_frame( &p_sys->context, p_block->i_buffer,
 152                                      p_block->p_buffer );
 153     if( i_status < 0 )
 154     {
 155         msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
 156                   p_block->i_buffer );
 157         block_Release( p_block );
 158         return NULL;
 159     }
 160
 161     p_dec->fmt_out.video.i_width = p_sys->context.i_width;
 162     p_dec->fmt_out.video.i_height = p_sys->context.i_height;
 163     p_dec->fmt_out.video.i_aspect = p_sys->context.i_width
 164         * VOUT_ASPECT_FACTOR / p_sys->context.i_height;
 165     p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
 166
 167     /* Get a new picture */
 168     if( ( p_pic = p_dec->pf_vout_buffer_new( p_dec ) ) )
 169     {
 170         for( i_plane = 0; i_plane < 3; i_plane++ )
 171         {
 172             int i_line, i_lines;
 173
 174             p_dst = p_pic->p[i_plane].p_pixels;
 175             p_src = p_sys->context.p_pix[i_plane];
 176
 177             i_lines = __MIN( p_sys->context.i_lines[i_plane],
 178                              p_pic->p[i_plane].i_visible_lines );
 179             for( i_line = 0; i_line < i_lines; i_line++ )
 180             {
 181                 memcpy( p_dst, p_src,
 182                         __MIN( p_pic->p[i_plane].i_pitch,
 183                                p_sys->context.i_stride[i_plane] ) );
 184                 p_dst += p_pic->p[i_plane].i_pitch;
 185                 p_src += p_sys->context.i_stride[i_plane];
 186             }
 187         }
 188
 189         p_pic->date = p_block->i_pts ? p_block->i_pts : p_block->i_dts;
 190     }
 191
 192     block_Release( p_block );
 193     return p_pic;
 194 }
 195
 196 /*****************************************************************************
 197  * CloseDecoder: decoder destruction
 198  *****************************************************************************/
 199 static void CloseDecoder( vlc_object_t *p_this )
 200 {
 201     decoder_t     *p_dec = (decoder_t *)p_this;
 202     decoder_sys_t *p_sys = p_dec->p_sys;
 203     int i;
 204
 205     msg_Dbg( p_dec, "cinepak decoder stopped" );
 206
 207     for( i = 0; i < 3; i++ )
 208     {
 209         if( p_sys->context.p_pix[i] ) free( p_sys->context.p_pix[i] );
 210     }
 211
 212     free( p_sys );
 213 }
 214
 215 /*****************************************************************************
 216  * local Functions
 217  *****************************************************************************/
 218
 219 #define GET2BYTES( p ) \
 220     GetWBE( p ); p+= 2;
 221 /* FIXME */
 222 #define GET3BYTES( p ) \
 223     (GetDWBE( p ) >> 8); p+= 3;
 224
 225 #define GET4BYTES( p ) \
 226     GetDWBE( p ); p+= 4;
 227
 228 #define FREE( p ) \
 229     if( p ) free( p )
 230
 231 static void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
 232                                   uint8_t *p_data, int b_grayscale )
 233 {
 234     int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
 235     int i_uv;
 236 #define SCALEBITS 12
 237 #define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
 238
 239     for( i = 0; i < 4; i++ )
 240     {
 241         i_y[i] = (uint8_t)( *(p_data++) );
 242     }
 243     if( b_grayscale )
 244     {
 245         i_u  = (int8_t)( *(p_data++) );
 246         i_v  = (int8_t)( *(p_data++) );
 247     }
 248     else
 249     {
 250         i_u  = 0;
 251         i_v  = 0;
 252     }
 253
 254     /*
 255           | Y  |   | 1 -0.0655  0.0110 | | CY |
 256           | Cb | = | 0  1.1656 -0.0062 | | CU |
 257           | Cr |   | 0  0.0467  1.4187 | | CV |
 258      */
 259     i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
 260     for( i = 0; i < 4; i++ )
 261     {
 262         i_y[i] += i_uv;
 263     }
 264     i_Cb  = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
 265     i_Cr  = ( FIX( 0.0467 ) * i_u + FIX(  1.4187 ) * i_v ) >> SCALEBITS;
 266
 267     for( i = 0; i < 4; i++ )
 268     {
 269         p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
 270     }
 271     p_codebook->i_u  = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
 272     p_codebook->i_v  = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
 273
 274 #undef FIX
 275 #undef SCALEBITS
 276 }
 277
 278 static void cinepak_Getv4( cinepak_context_t *p_context,
 279                            int i_strip, int i_x, int i_y,
 280                            int i_x2, int i_y2, uint8_t *p_data )
 281 {
 282     uint8_t i_index[4];
 283     int i,j;
 284
 285     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 286 #define PIX_SET_Y( x, y, v ) \
 287     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 288
 289 #define PIX_SET_UV( i, p, x, y, v ) \
 290     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 291
 292     for( i = 0; i < 4; i++ )
 293     {
 294         i_index[i] = *(p_data++);
 295     }
 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_v4[i_strip][i_index[j+2*i]].i_y[0]);
 308             PIX_SET_Y( 2*j + 1, 2*i + 0,
 309                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
 310             PIX_SET_Y( 2*j + 0, 2*i + 1,
 311                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
 312             PIX_SET_Y( 2*j + 1, 2*i + 1,
 313                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
 314
 315             PIX_SET_UV( 1, p_dst_u, j, i,
 316                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
 317             PIX_SET_UV( 2, p_dst_v, j, i,
 318                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
 319         }
 320     }
 321 #undef PIX_SET_Y
 322 #undef PIX_SET_UV
 323 }
 324
 325 static void cinepak_Getv1( cinepak_context_t *p_context,
 326                            int i_strip, int i_x,  int i_y,
 327                            int i_x2, int i_y2, uint8_t *p_data )
 328 {
 329     uint8_t i_index;
 330     int i,j;
 331
 332     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 333 #define PIX_SET_Y( x, y, v ) \
 334     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 335
 336 #define PIX_SET_UV( i,p, x, y, v ) \
 337     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 338
 339     i_index = *(p_data++);
 340
 341     /* y plane */
 342     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 343     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 344     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 345
 346     for( i = 0; i < 2; i++ )
 347     {
 348         for( j = 0; j < 2; j ++ )
 349         {
 350             PIX_SET_Y( 2*j + 0, 2*i + 0,
 351                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 352             PIX_SET_Y( 2*j + 1, 2*i + 0,
 353                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 354             PIX_SET_Y( 2*j + 0, 2*i + 1,
 355                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 356             PIX_SET_Y( 2*j + 1, 2*i + 1,
 357                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 358
 359             PIX_SET_UV( 1,p_dst_u, j, i,
 360                         p_context->codebook_v1[i_strip][i_index].i_u );
 361             PIX_SET_UV( 2,p_dst_v, j, i,
 362                         p_context->codebook_v1[i_strip][i_index].i_v );
 363         }
 364     }
 365
 366 #undef PIX_SET_Y
 367 #undef PIX_SET_UV
 368 }
 369
 370 /*****************************************************************************
 371  * The function that decode one frame
 372  *****************************************************************************/
 373 static int cinepak_decode_frame( cinepak_context_t *p_context,
 374                                  int i_length, uint8_t *p_data )
 375 {
 376     int i_strip;
 377
 378     int i_frame_flags;
 379     int i_frame_size;
 380     int i_width, i_height;
 381     int i_frame_strips;
 382     int i_index;
 383     int i_strip_x1 =0, i_strip_y1=0;
 384     int i_strip_x2 =0, i_strip_y2=0;
 385
 386     if( i_length <= 10 )
 387     {
 388         /* Broken header or no data */
 389         return( -1 );
 390     }
 391
 392     /* get header */
 393     i_frame_flags  = *(p_data++);
 394     i_frame_size = GET3BYTES( p_data );
 395     i_width  = GET2BYTES( p_data );
 396     i_height = GET2BYTES( p_data );
 397     i_frame_strips = GET2BYTES( p_data );
 398
 399     if( !i_frame_size || !i_width || !i_height )
 400     {
 401         /* Broken header */
 402         return( -1 );
 403     }
 404
 405     /* Check if we have a picture buffer with good size */
 406     if( ( p_context->i_width != i_width ) ||
 407         ( p_context->i_height != i_height ) )
 408     {
 409         int i;
 410         for( i = 0; i < 3; i++ )
 411         {
 412             FREE( p_context->p_pix[i] );
 413         }
 414
 415         p_context->i_width = i_width;
 416         p_context->i_height = i_height;
 417
 418         p_context->i_stride[0] = ( i_width + 3 ) & 0xfffc;
 419         p_context->i_stride[1] = p_context->i_stride[2] =
 420                 p_context->i_stride[0] / 2;
 421
 422         p_context->i_lines[0] = ( i_height + 3 ) & 0xfffc;
 423         p_context->i_lines[1] = p_context->i_lines[2] =
 424                 p_context->i_lines[0] /2;
 425
 426         for( i = 0; i < 3; i++ )
 427         {
 428             p_context->p_pix[i] = malloc( p_context->i_stride[i] *
 429                                           p_context->i_lines[i] );
 430             /* Set it to all black */
 431             memset( p_context->p_pix[i], ( i == 0 ) ? 0 : 128 ,
 432                     p_context->i_stride[i] * p_context->i_lines[i] );
 433         }
 434     }
 435
 436     if( i_frame_size != i_length )
 437     {
 438         i_length = __MIN( i_length, i_frame_size );
 439     }
 440     i_length -= 10;
 441
 442     if( i_frame_strips >= CINEPAK_MAXSTRIP )
 443     {
 444         i_frame_strips = CINEPAK_MAXSTRIP;
 445     }
 446
 447     /* Now decode each strip */
 448     for( i_strip = 0; i_strip < i_frame_strips; i_strip++ )
 449     {
 450         int i_strip_id;
 451         int i_strip_size;
 452
 453         if( i_length <= 12 )
 454         {
 455             break;
 456         }
 457
 458         i_strip_id   = GET2BYTES( p_data );
 459         i_strip_size = GET2BYTES( p_data );
 460         i_strip_size = __MIN( i_strip_size, i_length );
 461         /* FIXME I don't really understand how it's work; */
 462         i_strip_y1  = i_strip_y2 + GET2BYTES( p_data );
 463         i_strip_x1  = GET2BYTES( p_data );
 464         i_strip_y2  = i_strip_y2 + GET2BYTES( p_data );
 465         i_strip_x2  = GET2BYTES( p_data );
 466
 467         i_length -= i_strip_size;
 468
 469         i_strip_size -= 12;
 470         /* init codebook , if needed */
 471         if( ( i_strip > 0 )&&( !(i_frame_flags&0x01) ) )
 472         {
 473             memcpy( &p_context->codebook_v1[i_strip],
 474                     &p_context->codebook_v1[i_strip-1],
 475                     sizeof(cinepak_codebook_t[256] ) );
 476
 477             memcpy( &p_context->codebook_v4[i_strip],
 478                     &p_context->codebook_v4[i_strip-1],
 479                     sizeof(cinepak_codebook_t[256] ) );
 480         }
 481
 482         /* Now parse all chunk in this strip */
 483         while( i_strip_size > 0 )
 484         {
 485             cinepak_codebook_t (*p_codebook)[CINEPAK_MAXSTRIP][256];
 486             int i_mode;
 487
 488             int i_chunk_id;
 489             int i_chunk_size;
 490             uint32_t i_vector_flags;
 491             int i_count;
 492             int i;
 493             int i_x, i_y; /* (0,0) begin in fact at (x1,y1) ... */
 494
 495             i_chunk_id   = GET2BYTES( p_data );
 496             i_chunk_size = GET2BYTES( p_data );
 497             i_chunk_size  = __MIN( i_chunk_size, i_strip_size );
 498             i_strip_size -= i_chunk_size;
 499
 500             i_chunk_size -= 4;
 501
 502             i_x = 0;
 503             i_y = 0;
 504             if( i_chunk_size < 0 )
 505             {
 506                 break;
 507             }
 508
 509             switch( i_chunk_id )
 510             {
 511             case( 0x2000 ): /* 12bits v4 Intra*/
 512             case( 0x2200 ): /* 12bits v1 Intra*/
 513             case( 0x2400 ): /* 8bits v4 Intra*/
 514             case( 0x2600 ): /* 8bits v1 Intra */
 515                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 516                 p_codebook = ( i_chunk_id&0x0200 ) ?
 517                                &p_context->codebook_v1 :
 518                                &p_context->codebook_v4;
 519
 520                 i_count = __MIN( i_chunk_size / ( i_mode ? 6 : 4 ), 256 );
 521
 522                 for( i = 0; i < i_count; i++ )
 523                 {
 524                     cinepak_LoadCodebook( &((*p_codebook)[i_strip][i]),
 525                                           p_data,
 526                                           i_mode&~p_context->b_grayscale );
 527                     p_data += i_mode ? 6 : 4;
 528                     i_chunk_size -= i_mode ? 6 : 4;
 529                 }
 530                 break;
 531
 532             case( 0x2100 ): /* selective 12bits v4 Inter*/
 533             case( 0x2300 ): /* selective 12bits v1 Inter*/
 534             case( 0x2500 ): /* selective 8bits v4 Inter*/
 535             case( 0x2700 ): /* selective 8bits v1 Inter*/
 536                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 537                 p_codebook = ( i_chunk_id&0x0200 ) ?
 538                                &p_context->codebook_v1 :
 539                                &p_context->codebook_v4;
 540
 541                 i_index = 0;
 542                 while( (i_chunk_size > 4)&&(i_index<256))
 543                 {
 544                     i_vector_flags = GET4BYTES( p_data );
 545                     i_chunk_size -= 4;
 546                     for( i = 0; i < 32; i++ )
 547                     {
 548                         if( ( i_chunk_size < ( i_mode ? 6 : 4 ) )
 549                             || (i_index >= 256 ) )
 550                         {
 551                             break;
 552                         }
 553                         if( i_vector_flags&0x80000000UL )
 554                         {
 555                             cinepak_LoadCodebook(
 556                                 &((*p_codebook)[i_strip][i_index]),
 557                                 p_data, i_mode&~p_context->b_grayscale );
 558
 559                             p_data += i_mode ? 6 : 4;
 560                             i_chunk_size -= i_mode ? 6 : 4;
 561                         }
 562                         i_index++;
 563                         i_vector_flags <<= 1;
 564                     }
 565                 }
 566                 break;
 567
 568             case( 0x3000 ): /* load image Intra */
 569                 while( (i_chunk_size >= 4 )&&(i_y<i_strip_y2-i_strip_y1) )
 570                 {
 571                     i_vector_flags = GET4BYTES( p_data );
 572                     i_chunk_size -= 4;
 573                     i_strip_size -= 4;
 574                     i_length     -= 4;
 575
 576                     for( i = 0; i < 32; i++ )
 577                     {
 578                         if( ( i_y >= i_strip_y2 - i_strip_y1) ||
 579                             ( i_chunk_size<=0 ) )
 580                         {
 581                             break;
 582                         }
 583                         if( i_vector_flags&0x80000000UL )
 584                         {
 585                             cinepak_Getv4( p_context,
 586                                            i_strip,
 587                                            i_strip_x1 + i_x,
 588                                            i_strip_y1 + i_y,
 589                                            i_strip_x2, i_strip_y2,
 590                                            p_data );
 591                             p_data += 4;
 592                             i_chunk_size -= 4;
 593                         }
 594                         else
 595                         {
 596                             cinepak_Getv1( p_context,
 597                                            i_strip,
 598                                            i_strip_x1 + i_x,
 599                                            i_strip_y1 + i_y,
 600                                            i_strip_x2, i_strip_y2,
 601                                            p_data );
 602                             p_data++;
 603                             i_chunk_size--;
 604                         }
 605
 606                         i_x += 4;
 607                         if( i_x >= i_strip_x2 - i_strip_x1 )
 608                         {
 609                             i_x = 0;
 610                             i_y += 4;
 611                         }
 612                         i_vector_flags <<= 1;
 613                     }
 614                 }
 615                 break;
 616
 617             case( 0x3100 ): /* load image Inter */
 618                 while( ( i_chunk_size > 4 )&&( i_y < i_strip_y2 - i_strip_y1) )
 619                 {
 620                     uint32_t i_mask;
 621                     i_vector_flags = GET4BYTES( p_data );
 622                     i_chunk_size -= 4;
 623                     i_mask = 0x80000000UL;
 624
 625                     while( (i_chunk_size > 0 ) && ( i_mask )
 626                            && ( i_y < i_strip_y2 - i_strip_y1 ) )
 627                     {
 628                         if( i_vector_flags&i_mask )
 629                         {
 630                             i_mask >>= 1;
 631                             if( !i_mask )
 632                             {
 633                                 if( i_chunk_size < 4 )
 634                                 {
 635                                     break;
 636                                 }
 637                                 i_vector_flags = GET4BYTES( p_data );
 638                                 i_chunk_size -= 4;
 639                                 i_mask = 0x80000000UL;
 640                             }
 641                             if( i_vector_flags&i_mask )
 642                             {
 643                                 if( i_chunk_size < 4 ) break;
 644                                 cinepak_Getv4( p_context,
 645                                                i_strip,
 646                                                i_strip_x1 + i_x,
 647                                                i_strip_y1 + i_y,
 648                                                i_strip_x2, i_strip_y2,
 649                                                p_data );
 650                                 p_data += 4;
 651                                 i_chunk_size -= 4;
 652                             }
 653                             else
 654                             {
 655                                 if( i_chunk_size < 1 ) break;
 656                                 cinepak_Getv1( p_context,
 657                                                i_strip,
 658                                                i_strip_x1 + i_x,
 659                                                i_strip_y1 + i_y,
 660                                                i_strip_x2, i_strip_y2,
 661                                                p_data );
 662                                 p_data++;
 663                                 i_chunk_size--;
 664                             }
 665                         }
 666                         i_mask >>= 1;
 667
 668                         i_x += 4;
 669                         if( i_x >= i_strip_x2 - i_strip_x1 )
 670                         {
 671                             i_x = 0;
 672                             i_y += 4;
 673                         }
 674                     }
 675                 }
 676                 break;
 677
 678             case( 0x3200 ): /* load intra picture but all v1*/
 679                 while( ( i_chunk_size > 0 ) &&
 680                        ( i_y < i_strip_y2 - i_strip_y1 ) )
 681                 {
 682                     cinepak_Getv1( p_context,
 683                                    i_strip,
 684                                    i_strip_x1 + i_x,
 685                                    i_strip_y1 + i_y,
 686                                    i_strip_x2, i_strip_y2,
 687                                    p_data );
 688                     p_data++;
 689                     i_chunk_size--;
 690
 691                     i_x += 4;
 692                     if( i_x >= i_strip_x2 - i_strip_x1 )
 693                     {
 694                         i_x = 0;
 695                         i_y += 4;
 696                     }
 697                 }
 698                 break;
 699
 700             default:
 701                 break;
 702
 703             }
 704             p_data += i_chunk_size ; /* skip remains bytes */
 705         }
 706     }
 707
 708     return( 0 );
 709 }