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

   1 /*****************************************************************************
   2  * cinepak.c: cinepak video decoder
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 the VideoLAN team
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28 #include <vlc_vout.h>
  29 #include <vlc_codec.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 static void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
 229                                   uint8_t *p_data, int b_grayscale )
 230 {
 231     int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
 232     int i_uv;
 233 #define SCALEBITS 12
 234 #define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
 235
 236     for( i = 0; i < 4; i++ )
 237     {
 238         i_y[i] = (uint8_t)( *(p_data++) );
 239     }
 240     if( b_grayscale )
 241     {
 242         i_u  = (int8_t)( *(p_data++) );
 243         i_v  = (int8_t)( *(p_data++) );
 244     }
 245     else
 246     {
 247         i_u  = 0;
 248         i_v  = 0;
 249     }
 250
 251     /*
 252           | Y  |   | 1 -0.0655  0.0110 | | CY |
 253           | Cb | = | 0  1.1656 -0.0062 | | CU |
 254           | Cr |   | 0  0.0467  1.4187 | | CV |
 255      */
 256     i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
 257     for( i = 0; i < 4; i++ )
 258     {
 259         i_y[i] += i_uv;
 260     }
 261     i_Cb  = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
 262     i_Cr  = ( FIX( 0.0467 ) * i_u + FIX(  1.4187 ) * i_v ) >> SCALEBITS;
 263
 264     for( i = 0; i < 4; i++ )
 265     {
 266         p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
 267     }
 268     p_codebook->i_u  = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
 269     p_codebook->i_v  = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
 270
 271 #undef FIX
 272 #undef SCALEBITS
 273 }
 274
 275 static void cinepak_Getv4( cinepak_context_t *p_context,
 276                            int i_strip, int i_x, int i_y,
 277                            int i_x2, int i_y2, uint8_t *p_data )
 278 {
 279     uint8_t i_index[4];
 280     int i,j;
 281
 282     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 283 #define PIX_SET_Y( x, y, v ) \
 284     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 285
 286 #define PIX_SET_UV( i, p, x, y, v ) \
 287     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 288
 289     for( i = 0; i < 4; i++ )
 290     {
 291         i_index[i] = *(p_data++);
 292     }
 293
 294     /* y plane */
 295     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 296     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 297     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 298
 299     for( i = 0; i < 2; i++ )
 300     {
 301         for( j = 0; j < 2; j ++ )
 302         {
 303             PIX_SET_Y( 2*j + 0, 2*i + 0,
 304                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[0]);
 305             PIX_SET_Y( 2*j + 1, 2*i + 0,
 306                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
 307             PIX_SET_Y( 2*j + 0, 2*i + 1,
 308                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
 309             PIX_SET_Y( 2*j + 1, 2*i + 1,
 310                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
 311
 312             PIX_SET_UV( 1, p_dst_u, j, i,
 313                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
 314             PIX_SET_UV( 2, p_dst_v, j, i,
 315                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
 316         }
 317     }
 318 #undef PIX_SET_Y
 319 #undef PIX_SET_UV
 320 }
 321
 322 static void cinepak_Getv1( cinepak_context_t *p_context,
 323                            int i_strip, int i_x,  int i_y,
 324                            int i_x2, int i_y2, uint8_t *p_data )
 325 {
 326     uint8_t i_index;
 327     int i,j;
 328
 329     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 330 #define PIX_SET_Y( x, y, v ) \
 331     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 332
 333 #define PIX_SET_UV( i,p, x, y, v ) \
 334     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 335
 336     i_index = *(p_data++);
 337
 338     /* y plane */
 339     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 340     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 341     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 342
 343     for( i = 0; i < 2; i++ )
 344     {
 345         for( j = 0; j < 2; j ++ )
 346         {
 347             PIX_SET_Y( 2*j + 0, 2*i + 0,
 348                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 349             PIX_SET_Y( 2*j + 1, 2*i + 0,
 350                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 351             PIX_SET_Y( 2*j + 0, 2*i + 1,
 352                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 353             PIX_SET_Y( 2*j + 1, 2*i + 1,
 354                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 355
 356             PIX_SET_UV( 1,p_dst_u, j, i,
 357                         p_context->codebook_v1[i_strip][i_index].i_u );
 358             PIX_SET_UV( 2,p_dst_v, j, i,
 359                         p_context->codebook_v1[i_strip][i_index].i_v );
 360         }
 361     }
 362
 363 #undef PIX_SET_Y
 364 #undef PIX_SET_UV
 365 }
 366
 367 /*****************************************************************************
 368  * The function that decode one frame
 369  *****************************************************************************/
 370 static int cinepak_decode_frame( cinepak_context_t *p_context,
 371                                  int i_length, uint8_t *p_data )
 372 {
 373     int i_strip;
 374
 375     int i_frame_flags;
 376     int i_frame_size;
 377     int i_width, i_height;
 378     int i_frame_strips;
 379     int i_index;
 380     int i_strip_x1 =0, i_strip_y1=0;
 381     int i_strip_x2 =0, i_strip_y2=0;
 382
 383     if( i_length <= 10 )
 384     {
 385         /* Broken header or no data */
 386         return( -1 );
 387     }
 388
 389     /* get header */
 390     i_frame_flags  = *(p_data++);
 391     i_frame_size = GET3BYTES( p_data );
 392     i_width  = GET2BYTES( p_data );
 393     i_height = GET2BYTES( p_data );
 394     i_frame_strips = GET2BYTES( p_data );
 395
 396     if( !i_frame_size || !i_width || !i_height )
 397     {
 398         /* Broken header */
 399         return( -1 );
 400     }
 401
 402     /* Check if we have a picture buffer with good size */
 403     if( ( p_context->i_width != i_width ) ||
 404         ( p_context->i_height != i_height ) )
 405     {
 406         int i;
 407         for( i = 0; i < 3; i++ )
 408         {
 409             free( p_context->p_pix[i] );
 410         }
 411
 412         p_context->i_width = i_width;
 413         p_context->i_height = i_height;
 414
 415         p_context->i_stride[0] = ( i_width + 3 ) & 0xfffc;
 416         p_context->i_stride[1] = p_context->i_stride[2] =
 417                 p_context->i_stride[0] / 2;
 418
 419         p_context->i_lines[0] = ( i_height + 3 ) & 0xfffc;
 420         p_context->i_lines[1] = p_context->i_lines[2] =
 421                 p_context->i_lines[0] /2;
 422
 423         for( i = 0; i < 3; i++ )
 424         {
 425             p_context->p_pix[i] = malloc( p_context->i_stride[i] *
 426                                           p_context->i_lines[i] );
 427             /* Set it to all black */
 428             memset( p_context->p_pix[i], ( i == 0 ) ? 0 : 128 ,
 429                     p_context->i_stride[i] * p_context->i_lines[i] );
 430         }
 431     }
 432
 433     if( i_frame_size != i_length )
 434     {
 435         i_length = __MIN( i_length, i_frame_size );
 436     }
 437     i_length -= 10;
 438
 439     if( i_frame_strips >= CINEPAK_MAXSTRIP )
 440     {
 441         i_frame_strips = CINEPAK_MAXSTRIP;
 442     }
 443
 444     /* Now decode each strip */
 445     for( i_strip = 0; i_strip < i_frame_strips; i_strip++ )
 446     {
 447         int i_strip_id;
 448         int i_strip_size;
 449
 450         if( i_length <= 12 )
 451         {
 452             break;
 453         }
 454
 455         i_strip_id   = GET2BYTES( p_data );
 456         i_strip_size = GET2BYTES( p_data );
 457         i_strip_size = __MIN( i_strip_size, i_length );
 458         /* FIXME I don't really understand how it works; */
 459         i_strip_y1  = i_strip_y2 + GET2BYTES( p_data );
 460         i_strip_x1  = GET2BYTES( p_data );
 461         i_strip_y2  = i_strip_y2 + GET2BYTES( p_data );
 462         i_strip_x2  = GET2BYTES( p_data );
 463
 464         i_length -= i_strip_size;
 465
 466         i_strip_size -= 12;
 467         /* init codebook , if needed */
 468         if( ( i_strip > 0 )&&( !(i_frame_flags&0x01) ) )
 469         {
 470             memcpy( &p_context->codebook_v1[i_strip],
 471                     &p_context->codebook_v1[i_strip-1],
 472                     sizeof(cinepak_codebook_t[256] ) );
 473
 474             memcpy( &p_context->codebook_v4[i_strip],
 475                     &p_context->codebook_v4[i_strip-1],
 476                     sizeof(cinepak_codebook_t[256] ) );
 477         }
 478
 479         /* Now parse all chunk in this strip */
 480         while( i_strip_size > 0 )
 481         {
 482             cinepak_codebook_t (*p_codebook)[CINEPAK_MAXSTRIP][256];
 483             int i_mode;
 484
 485             int i_chunk_id;
 486             int i_chunk_size;
 487             uint32_t i_vector_flags;
 488             int i_count;
 489             int i;
 490             int i_x, i_y; /* (0,0) begin in fact at (x1,y1) ... */
 491
 492             i_chunk_id   = GET2BYTES( p_data );
 493             i_chunk_size = GET2BYTES( p_data );
 494             i_chunk_size  = __MIN( i_chunk_size, i_strip_size );
 495             i_strip_size -= i_chunk_size;
 496
 497             i_chunk_size -= 4;
 498
 499             i_x = 0;
 500             i_y = 0;
 501             if( i_chunk_size < 0 )
 502             {
 503                 break;
 504             }
 505
 506             switch( i_chunk_id )
 507             {
 508             case( 0x2000 ): /* 12bits v4 Intra*/
 509             case( 0x2200 ): /* 12bits v1 Intra*/
 510             case( 0x2400 ): /* 8bits v4 Intra*/
 511             case( 0x2600 ): /* 8bits v1 Intra */
 512                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 513                 p_codebook = ( i_chunk_id&0x0200 ) ?
 514                                &p_context->codebook_v1 :
 515                                &p_context->codebook_v4;
 516
 517                 i_count = __MIN( i_chunk_size / ( i_mode ? 6 : 4 ), 256 );
 518
 519                 for( i = 0; i < i_count; i++ )
 520                 {
 521                     cinepak_LoadCodebook( &((*p_codebook)[i_strip][i]),
 522                                           p_data,
 523                                           i_mode&~p_context->b_grayscale );
 524                     p_data += i_mode ? 6 : 4;
 525                     i_chunk_size -= i_mode ? 6 : 4;
 526                 }
 527                 break;
 528
 529             case( 0x2100 ): /* selective 12bits v4 Inter*/
 530             case( 0x2300 ): /* selective 12bits v1 Inter*/
 531             case( 0x2500 ): /* selective 8bits v4 Inter*/
 532             case( 0x2700 ): /* selective 8bits v1 Inter*/
 533                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 534                 p_codebook = ( i_chunk_id&0x0200 ) ?
 535                                &p_context->codebook_v1 :
 536                                &p_context->codebook_v4;
 537
 538                 i_index = 0;
 539                 while( (i_chunk_size > 4)&&(i_index<256))
 540                 {
 541                     i_vector_flags = GET4BYTES( p_data );
 542                     i_chunk_size -= 4;
 543                     for( i = 0; i < 32; i++ )
 544                     {
 545                         if( ( i_chunk_size < ( i_mode ? 6 : 4 ) )
 546                             || (i_index >= 256 ) )
 547                         {
 548                             break;
 549                         }
 550                         if( i_vector_flags&0x80000000UL )
 551                         {
 552                             cinepak_LoadCodebook(
 553                                 &((*p_codebook)[i_strip][i_index]),
 554                                 p_data, i_mode&~p_context->b_grayscale );
 555
 556                             p_data += i_mode ? 6 : 4;
 557                             i_chunk_size -= i_mode ? 6 : 4;
 558                         }
 559                         i_index++;
 560                         i_vector_flags <<= 1;
 561                     }
 562                 }
 563                 break;
 564
 565             case( 0x3000 ): /* load image Intra */
 566                 while( (i_chunk_size >= 4 )&&(i_y<i_strip_y2-i_strip_y1) )
 567                 {
 568                     i_vector_flags = GET4BYTES( p_data );
 569                     i_chunk_size -= 4;
 570                     i_strip_size -= 4;
 571                     i_length     -= 4;
 572
 573                     for( i = 0; i < 32; i++ )
 574                     {
 575                         if( ( i_y >= i_strip_y2 - i_strip_y1) ||
 576                             ( i_chunk_size<=0 ) )
 577                         {
 578                             break;
 579                         }
 580                         if( i_vector_flags&0x80000000UL )
 581                         {
 582                             cinepak_Getv4( p_context,
 583                                            i_strip,
 584                                            i_strip_x1 + i_x,
 585                                            i_strip_y1 + i_y,
 586                                            i_strip_x2, i_strip_y2,
 587                                            p_data );
 588                             p_data += 4;
 589                             i_chunk_size -= 4;
 590                         }
 591                         else
 592                         {
 593                             cinepak_Getv1( p_context,
 594                                            i_strip,
 595                                            i_strip_x1 + i_x,
 596                                            i_strip_y1 + i_y,
 597                                            i_strip_x2, i_strip_y2,
 598                                            p_data );
 599                             p_data++;
 600                             i_chunk_size--;
 601                         }
 602
 603                         i_x += 4;
 604                         if( i_x >= i_strip_x2 - i_strip_x1 )
 605                         {
 606                             i_x = 0;
 607                             i_y += 4;
 608                         }
 609                         i_vector_flags <<= 1;
 610                     }
 611                 }
 612                 break;
 613
 614             case( 0x3100 ): /* load image Inter */
 615                 while( ( i_chunk_size > 4 )&&( i_y < i_strip_y2 - i_strip_y1) )
 616                 {
 617                     uint32_t i_mask;
 618                     i_vector_flags = GET4BYTES( p_data );
 619                     i_chunk_size -= 4;
 620                     i_mask = 0x80000000UL;
 621
 622                     while( (i_chunk_size > 0 ) && ( i_mask )
 623                            && ( i_y < i_strip_y2 - i_strip_y1 ) )
 624                     {
 625                         if( i_vector_flags&i_mask )
 626                         {
 627                             i_mask >>= 1;
 628                             if( !i_mask )
 629                             {
 630                                 if( i_chunk_size < 4 )
 631                                 {
 632                                     break;
 633                                 }
 634                                 i_vector_flags = GET4BYTES( p_data );
 635                                 i_chunk_size -= 4;
 636                                 i_mask = 0x80000000UL;
 637                             }
 638                             if( i_vector_flags&i_mask )
 639                             {
 640                                 if( i_chunk_size < 4 ) break;
 641                                 cinepak_Getv4( p_context,
 642                                                i_strip,
 643                                                i_strip_x1 + i_x,
 644                                                i_strip_y1 + i_y,
 645                                                i_strip_x2, i_strip_y2,
 646                                                p_data );
 647                                 p_data += 4;
 648                                 i_chunk_size -= 4;
 649                             }
 650                             else
 651                             {
 652                                 if( i_chunk_size < 1 ) break;
 653                                 cinepak_Getv1( p_context,
 654                                                i_strip,
 655                                                i_strip_x1 + i_x,
 656                                                i_strip_y1 + i_y,
 657                                                i_strip_x2, i_strip_y2,
 658                                                p_data );
 659                                 p_data++;
 660                                 i_chunk_size--;
 661                             }
 662                         }
 663                         i_mask >>= 1;
 664
 665                         i_x += 4;
 666                         if( i_x >= i_strip_x2 - i_strip_x1 )
 667                         {
 668                             i_x = 0;
 669                             i_y += 4;
 670                         }
 671                     }
 672                 }
 673                 break;
 674
 675             case( 0x3200 ): /* load intra picture but all v1*/
 676                 while( ( i_chunk_size > 0 ) &&
 677                        ( i_y < i_strip_y2 - i_strip_y1 ) )
 678                 {
 679                     cinepak_Getv1( p_context,
 680                                    i_strip,
 681                                    i_strip_x1 + i_x,
 682                                    i_strip_y1 + i_y,
 683                                    i_strip_x2, i_strip_y2,
 684                                    p_data );
 685                     p_data++;
 686                     i_chunk_size--;
 687
 688                     i_x += 4;
 689                     if( i_x >= i_strip_x2 - i_strip_x1 )
 690                     {
 691                         i_x = 0;
 692                         i_y += 4;
 693                     }
 694                 }
 695                 break;
 696
 697             default:
 698                 break;
 699
 700             }
 701             p_data += i_chunk_size ; /* skip remains bytes */
 702         }
 703     }
 704
 705     return( 0 );
 706 }