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 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc_vout.h>
  33 #include <vlc_codec.h>
  34
  35 /*****************************************************************************
  36  * Module descriptor
  37  *****************************************************************************/
  38 static int  OpenDecoder ( vlc_object_t * );
  39 static void CloseDecoder( vlc_object_t * );
  40
  41 vlc_module_begin();
  42     set_description( _("Cinepak video decoder") );
  43     set_capability( "decoder", 100 );
  44     set_category( CAT_INPUT );
  45     set_subcategory( SUBCAT_INPUT_VCODEC );
  46     set_callbacks( OpenDecoder, CloseDecoder );
  47 vlc_module_end();
  48
  49
  50 /*****************************************************************************
  51  * Local prototypes
  52  *****************************************************************************/
  53 #define CINEPAK_MAXSTRIP 32
  54
  55 typedef struct
  56 {
  57     uint8_t i_y[4];
  58     uint8_t i_u, i_v;
  59
  60 } cinepak_codebook_t;
  61
  62 typedef struct
  63 {
  64     int b_grayscale; /* force to grayscale */
  65
  66     int i_width;
  67     int i_height;
  68
  69     int i_stride_x;
  70     int i_stride_y;
  71
  72     uint8_t *p_y, *p_u, *p_v;
  73
  74     int i_stride[3]; /* our 3 planes */
  75     int i_lines[3];
  76     uint8_t *p_pix[3];
  77
  78     cinepak_codebook_t codebook_v1[CINEPAK_MAXSTRIP][256];
  79     cinepak_codebook_t codebook_v4[CINEPAK_MAXSTRIP][256];
  80
  81 } cinepak_context_t;
  82
  83 /*****************************************************************************
  84  * decoder_sys_t : decoder descriptor
  85  *****************************************************************************/
  86 struct decoder_sys_t
  87 {
  88     /*
  89      * Cinepak properties
  90      */
  91     cinepak_context_t context;
  92 };
  93
  94 static picture_t *DecodeBlock ( decoder_t *, block_t ** );
  95
  96 static int cinepak_decode_frame( cinepak_context_t *, int, uint8_t * );
  97
  98 /*****************************************************************************
  99  * OpenDecoder: probe the decoder and return score
 100  *****************************************************************************
 101  * Tries to launch a decoder and return score so that the interface is able
 102  * to chose.
 103  *****************************************************************************/
 104 static int OpenDecoder( vlc_object_t *p_this )
 105 {
 106     decoder_t *p_dec = (decoder_t*)p_this;
 107     decoder_sys_t *p_sys;
 108     vlc_value_t val;
 109
 110     if( p_dec->fmt_in.i_codec != VLC_FOURCC('c','v','i','d') &&
 111         p_dec->fmt_in.i_codec != VLC_FOURCC('C','V','I','D') )
 112     {
 113         return VLC_EGENERIC;
 114     }
 115
 116     /* Allocate the memory needed to store the decoder's structure */
 117     if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
 118     {
 119         msg_Err( p_dec, "out of memory" );
 120         return VLC_EGENERIC;
 121     }
 122     memset( &p_sys->context, 0, sizeof( cinepak_context_t ) );
 123
 124     var_Create( p_dec, "grayscale", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 125     var_Get( p_dec, "grayscale", &val );
 126     p_sys->context.b_grayscale = val.b_bool;
 127
 128     p_dec->pf_decode_video = DecodeBlock;
 129
 130     msg_Dbg( p_dec, "cinepak decoder started" );
 131
 132     return VLC_SUCCESS;
 133 }
 134
 135 /****************************************************************************
 136  * DecodeBlock: the whole thing
 137  ****************************************************************************
 138  * This function must be fed with whole frames.
 139  ****************************************************************************/
 140 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 141 {
 142     decoder_sys_t *p_sys = p_dec->p_sys;
 143     int i_status, i_plane;
 144     uint8_t *p_dst, *p_src;
 145     picture_t *p_pic;
 146     block_t *p_block;
 147
 148     if( !pp_block || !*pp_block )
 149     {
 150         return NULL;
 151     }
 152     p_block = *pp_block;
 153     *pp_block = NULL;
 154
 155     i_status = cinepak_decode_frame( &p_sys->context, p_block->i_buffer,
 156                                      p_block->p_buffer );
 157     if( i_status < 0 )
 158     {
 159         msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
 160                   p_block->i_buffer );
 161         block_Release( p_block );
 162         return NULL;
 163     }
 164
 165     p_dec->fmt_out.video.i_width = p_sys->context.i_width;
 166     p_dec->fmt_out.video.i_height = p_sys->context.i_height;
 167     p_dec->fmt_out.video.i_aspect = p_sys->context.i_width
 168         * VOUT_ASPECT_FACTOR / p_sys->context.i_height;
 169     p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
 170
 171     /* Get a new picture */
 172     if( ( p_pic = p_dec->pf_vout_buffer_new( p_dec ) ) )
 173     {
 174         for( i_plane = 0; i_plane < 3; i_plane++ )
 175         {
 176             int i_line, i_lines;
 177
 178             p_dst = p_pic->p[i_plane].p_pixels;
 179             p_src = p_sys->context.p_pix[i_plane];
 180
 181             i_lines = __MIN( p_sys->context.i_lines[i_plane],
 182                              p_pic->p[i_plane].i_visible_lines );
 183             for( i_line = 0; i_line < i_lines; i_line++ )
 184             {
 185                 memcpy( p_dst, p_src,
 186                         __MIN( p_pic->p[i_plane].i_pitch,
 187                                p_sys->context.i_stride[i_plane] ) );
 188                 p_dst += p_pic->p[i_plane].i_pitch;
 189                 p_src += p_sys->context.i_stride[i_plane];
 190             }
 191         }
 192
 193         p_pic->date = p_block->i_pts ? p_block->i_pts : p_block->i_dts;
 194     }
 195
 196     block_Release( p_block );
 197     return p_pic;
 198 }
 199
 200 /*****************************************************************************
 201  * CloseDecoder: decoder destruction
 202  *****************************************************************************/
 203 static void CloseDecoder( vlc_object_t *p_this )
 204 {
 205     decoder_t     *p_dec = (decoder_t *)p_this;
 206     decoder_sys_t *p_sys = p_dec->p_sys;
 207     int i;
 208
 209     msg_Dbg( p_dec, "cinepak decoder stopped" );
 210
 211     for( i = 0; i < 3; i++ )
 212         free( p_sys->context.p_pix[i] );
 213
 214     free( p_sys );
 215 }
 216
 217 /*****************************************************************************
 218  * local Functions
 219  *****************************************************************************/
 220
 221 #define GET2BYTES( p ) \
 222     GetWBE( p ); p+= 2;
 223 /* FIXME */
 224 #define GET3BYTES( p ) \
 225     (GetDWBE( p ) >> 8); p+= 3;
 226
 227 #define GET4BYTES( p ) \
 228     GetDWBE( p ); p+= 4;
 229
 230 static void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
 231                                   uint8_t *p_data, int b_grayscale )
 232 {
 233     int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
 234     int i_uv;
 235 #define SCALEBITS 12
 236 #define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
 237
 238     for( i = 0; i < 4; i++ )
 239     {
 240         i_y[i] = (uint8_t)( *(p_data++) );
 241     }
 242     if( b_grayscale )
 243     {
 244         i_u  = (int8_t)( *(p_data++) );
 245         i_v  = (int8_t)( *(p_data++) );
 246     }
 247     else
 248     {
 249         i_u  = 0;
 250         i_v  = 0;
 251     }
 252
 253     /*
 254           | Y  |   | 1 -0.0655  0.0110 | | CY |
 255           | Cb | = | 0  1.1656 -0.0062 | | CU |
 256           | Cr |   | 0  0.0467  1.4187 | | CV |
 257      */
 258     i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
 259     for( i = 0; i < 4; i++ )
 260     {
 261         i_y[i] += i_uv;
 262     }
 263     i_Cb  = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
 264     i_Cr  = ( FIX( 0.0467 ) * i_u + FIX(  1.4187 ) * i_v ) >> SCALEBITS;
 265
 266     for( i = 0; i < 4; i++ )
 267     {
 268         p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
 269     }
 270     p_codebook->i_u  = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
 271     p_codebook->i_v  = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
 272
 273 #undef FIX
 274 #undef SCALEBITS
 275 }
 276
 277 static void cinepak_Getv4( cinepak_context_t *p_context,
 278                            int i_strip, int i_x, int i_y,
 279                            uint8_t *p_data )
 280 {
 281     uint8_t i_index[4];
 282     int i,j;
 283
 284     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 285 #define PIX_SET_Y( x, y, v ) \
 286     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 287
 288 #define PIX_SET_UV( i, p, x, y, v ) \
 289     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 290
 291     for( i = 0; i < 4; i++ )
 292     {
 293         i_index[i] = *(p_data++);
 294     }
 295
 296     /* y plane */
 297     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 298     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 299     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 300
 301     for( i = 0; i < 2; i++ )
 302     {
 303         for( j = 0; j < 2; j ++ )
 304         {
 305             PIX_SET_Y( 2*j + 0, 2*i + 0,
 306                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[0]);
 307             PIX_SET_Y( 2*j + 1, 2*i + 0,
 308                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
 309             PIX_SET_Y( 2*j + 0, 2*i + 1,
 310                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
 311             PIX_SET_Y( 2*j + 1, 2*i + 1,
 312                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
 313
 314             PIX_SET_UV( 1, p_dst_u, j, i,
 315                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
 316             PIX_SET_UV( 2, p_dst_v, j, i,
 317                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
 318         }
 319     }
 320 #undef PIX_SET_Y
 321 #undef PIX_SET_UV
 322 }
 323
 324 static void cinepak_Getv1( cinepak_context_t *p_context,
 325                            int i_strip, int i_x,  int i_y,
 326                            uint8_t *p_data )
 327 {
 328     uint8_t i_index;
 329     int i,j;
 330
 331     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 332 #define PIX_SET_Y( x, y, v ) \
 333     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 334
 335 #define PIX_SET_UV( i,p, x, y, v ) \
 336     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 337
 338     i_index = *(p_data++);
 339
 340     /* y plane */
 341     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 342     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 343     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 344
 345     for( i = 0; i < 2; i++ )
 346     {
 347         for( j = 0; j < 2; j ++ )
 348         {
 349             PIX_SET_Y( 2*j + 0, 2*i + 0,
 350                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 351             PIX_SET_Y( 2*j + 1, 2*i + 0,
 352                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 353             PIX_SET_Y( 2*j + 0, 2*i + 1,
 354                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 355             PIX_SET_Y( 2*j + 1, 2*i + 1,
 356                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 357
 358             PIX_SET_UV( 1,p_dst_u, j, i,
 359                         p_context->codebook_v1[i_strip][i_index].i_u );
 360             PIX_SET_UV( 2,p_dst_v, j, i,
 361                         p_context->codebook_v1[i_strip][i_index].i_v );
 362         }
 363     }
 364
 365 #undef PIX_SET_Y
 366 #undef PIX_SET_UV
 367 }
 368
 369 /*****************************************************************************
 370  * The function that decode one frame
 371  *****************************************************************************/
 372 static int cinepak_decode_frame( cinepak_context_t *p_context,
 373                                  int i_length, uint8_t *p_data )
 374 {
 375     int i_strip;
 376
 377     int i_frame_flags;
 378     int i_frame_size;
 379     int i_width, i_height;
 380     int i_frame_strips;
 381     int i_index;
 382     int i_strip_x1 =0, i_strip_y1=0;
 383     int i_strip_x2 =0, i_strip_y2=0;
 384
 385     if( i_length <= 10 )
 386     {
 387         /* Broken header or no data */
 388         return( -1 );
 389     }
 390
 391     /* get header */
 392     i_frame_flags  = *(p_data++);
 393     i_frame_size = GET3BYTES( p_data );
 394     i_width  = GET2BYTES( p_data );
 395     i_height = GET2BYTES( p_data );
 396     i_frame_strips = GET2BYTES( p_data );
 397
 398     if( !i_frame_size || !i_width || !i_height ||
 399         i_width > 0xffff-3 || i_height > 0xffff-3)
 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 works; */
 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                                            p_data );
 590                             p_data += 4;
 591                             i_chunk_size -= 4;
 592                         }
 593                         else
 594                         {
 595                             cinepak_Getv1( p_context,
 596                                            i_strip,
 597                                            i_strip_x1 + i_x,
 598                                            i_strip_y1 + i_y,
 599                                            p_data );
 600                             p_data++;
 601                             i_chunk_size--;
 602                         }
 603
 604                         i_x += 4;
 605                         if( i_x >= i_strip_x2 - i_strip_x1 )
 606                         {
 607                             i_x = 0;
 608                             i_y += 4;
 609                         }
 610                         i_vector_flags <<= 1;
 611                     }
 612                 }
 613                 break;
 614
 615             case( 0x3100 ): /* load image Inter */
 616                 while( ( i_chunk_size > 4 )&&( i_y < i_strip_y2 - i_strip_y1) )
 617                 {
 618                     uint32_t i_mask;
 619                     i_vector_flags = GET4BYTES( p_data );
 620                     i_chunk_size -= 4;
 621                     i_mask = 0x80000000UL;
 622
 623                     while( (i_chunk_size > 0 ) && ( i_mask )
 624                            && ( i_y < i_strip_y2 - i_strip_y1 ) )
 625                     {
 626                         if( i_vector_flags&i_mask )
 627                         {
 628                             i_mask >>= 1;
 629                             if( !i_mask )
 630                             {
 631                                 if( i_chunk_size < 4 )
 632                                 {
 633                                     break;
 634                                 }
 635                                 i_vector_flags = GET4BYTES( p_data );
 636                                 i_chunk_size -= 4;
 637                                 i_mask = 0x80000000UL;
 638                             }
 639                             if( i_vector_flags&i_mask )
 640                             {
 641                                 if( i_chunk_size < 4 ) break;
 642                                 cinepak_Getv4( p_context,
 643                                                i_strip,
 644                                                i_strip_x1 + i_x,
 645                                                i_strip_y1 + i_y,
 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                                                p_data );
 658                                 p_data++;
 659                                 i_chunk_size--;
 660                             }
 661                         }
 662                         i_mask >>= 1;
 663
 664                         i_x += 4;
 665                         if( i_x >= i_strip_x2 - i_strip_x1 )
 666                         {
 667                             i_x = 0;
 668                             i_y += 4;
 669                         }
 670                     }
 671                 }
 672                 break;
 673
 674             case( 0x3200 ): /* load intra picture but all v1*/
 675                 while( ( i_chunk_size > 0 ) &&
 676                        ( i_y < i_strip_y2 - i_strip_y1 ) )
 677                 {
 678                     cinepak_Getv1( p_context,
 679                                    i_strip,
 680                                    i_strip_x1 + i_x,
 681                                    i_strip_y1 + i_y,
 682                                    p_data );
 683                     p_data++;
 684                     i_chunk_size--;
 685
 686                     i_x += 4;
 687                     if( i_x >= i_strip_x2 - i_strip_x1 )
 688                     {
 689                         i_x = 0;
 690                         i_y += 4;
 691                     }
 692                 }
 693                 break;
 694
 695             default:
 696                 break;
 697
 698             }
 699             p_data += i_chunk_size ; /* skip remains bytes */
 700         }
 701     }
 702
 703     return( 0 );
 704 }