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

   1 /*****************************************************************************
   2  * cinepak.c: cinepak video decoder
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   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_callbacks( OpenDecoder, CloseDecoder );
  41 vlc_module_end();
  42
  43
  44 /*****************************************************************************
  45  * Local prototypes
  46  *****************************************************************************/
  47 #define CINEPAK_MAXSTRIP 32
  48
  49 typedef struct
  50 {
  51     uint8_t i_y[4];
  52     uint8_t i_u, i_v;
  53
  54 } cinepak_codebook_t;
  55
  56 typedef struct
  57 {
  58     int b_grayscale; /* force to grayscale */
  59
  60     int i_width;
  61     int i_height;
  62
  63     int i_stride_x;
  64     int i_stride_y;
  65
  66     uint8_t *p_y, *p_u, *p_v;
  67
  68     int i_stride[3]; /* our 3 planes */
  69     int i_lines[3];
  70     uint8_t *p_pix[3];
  71
  72     cinepak_codebook_t codebook_v1[CINEPAK_MAXSTRIP][256];
  73     cinepak_codebook_t codebook_v4[CINEPAK_MAXSTRIP][256];
  74
  75 } cinepak_context_t;
  76
  77 /*****************************************************************************
  78  * decoder_sys_t : decoder descriptor
  79  *****************************************************************************/
  80 struct decoder_sys_t
  81 {
  82     /*
  83      * Cinepak properties
  84      */
  85     cinepak_context_t context;
  86 };
  87
  88 static picture_t *DecodeBlock ( decoder_t *, block_t ** );
  89
  90 static int cinepak_decode_frame( cinepak_context_t *, int, uint8_t * );
  91
  92 /*****************************************************************************
  93  * OpenDecoder: probe the decoder and return score
  94  *****************************************************************************
  95  * Tries to launch a decoder and return score so that the interface is able
  96  * to chose.
  97  *****************************************************************************/
  98 static int OpenDecoder( vlc_object_t *p_this )
  99 {
 100     decoder_t *p_dec = (decoder_t*)p_this;
 101     decoder_sys_t *p_sys;
 102     vlc_value_t val;
 103
 104     if( p_dec->fmt_in.i_codec != VLC_FOURCC('c','v','i','d') &&
 105         p_dec->fmt_in.i_codec != VLC_FOURCC('C','V','I','D') )
 106     {
 107         return VLC_EGENERIC;
 108     }
 109
 110     /* Allocate the memory needed to store the decoder's structure */
 111     if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
 112     {
 113         msg_Err( p_dec, "out of memory" );
 114         return VLC_EGENERIC;
 115     }
 116     memset( &p_sys->context, 0, sizeof( cinepak_context_t ) );
 117
 118     var_Create( p_dec, "grayscale", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 119     var_Get( p_dec, "grayscale", &val );
 120     p_sys->context.b_grayscale = val.b_bool;
 121
 122     p_dec->pf_decode_video = DecodeBlock;
 123
 124     msg_Dbg( p_dec, "cinepak decoder started" );
 125
 126     return VLC_SUCCESS;
 127 }
 128
 129 /****************************************************************************
 130  * DecodeBlock: the whole thing
 131  ****************************************************************************
 132  * This function must be fed with whole frames.
 133  ****************************************************************************/
 134 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 135 {
 136     decoder_sys_t *p_sys = p_dec->p_sys;
 137     int i_status, i_plane;
 138     uint8_t *p_dst, *p_src;
 139     picture_t *p_pic;
 140     block_t *p_block;
 141
 142     if( !pp_block || !*pp_block )
 143     {
 144         return NULL;
 145     }
 146     p_block = *pp_block;
 147     *pp_block = NULL;
 148
 149     i_status = cinepak_decode_frame( &p_sys->context, p_block->i_buffer,
 150                                      p_block->p_buffer );
 151     if( i_status < 0 )
 152     {
 153         msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
 154                   p_block->i_buffer );
 155         block_Release( p_block );
 156         return NULL;
 157     }
 158
 159     p_dec->fmt_out.video.i_width = p_sys->context.i_width;
 160     p_dec->fmt_out.video.i_height = p_sys->context.i_height;
 161     p_dec->fmt_out.video.i_aspect = p_sys->context.i_width
 162         * VOUT_ASPECT_FACTOR / p_sys->context.i_height;
 163     p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
 164
 165     /* Get a new picture */
 166     if( ( p_pic = p_dec->pf_vout_buffer_new( p_dec ) ) )
 167     {
 168         for( i_plane = 0; i_plane < 3; i_plane++ )
 169         {
 170             int i_line, i_lines;
 171
 172             p_dst = p_pic->p[i_plane].p_pixels;
 173             p_src = p_sys->context.p_pix[i_plane];
 174
 175             i_lines = __MIN( p_sys->context.i_lines[i_plane],
 176                              p_pic->p[i_plane].i_visible_lines );
 177             for( i_line = 0; i_line < i_lines; i_line++ )
 178             {
 179                 memcpy( p_dst, p_src,
 180                         __MIN( p_pic->p[i_plane].i_pitch,
 181                                p_sys->context.i_stride[i_plane] ) );
 182                 p_dst += p_pic->p[i_plane].i_pitch;
 183                 p_src += p_sys->context.i_stride[i_plane];
 184             }
 185         }
 186
 187         p_pic->date = p_block->i_pts ? p_block->i_pts : p_block->i_dts;
 188     }
 189
 190     block_Release( p_block );
 191     return p_pic;
 192 }
 193
 194 /*****************************************************************************
 195  * CloseDecoder: decoder destruction
 196  *****************************************************************************/
 197 static void CloseDecoder( vlc_object_t *p_this )
 198 {
 199     decoder_t     *p_dec = (decoder_t *)p_this;
 200     decoder_sys_t *p_sys = p_dec->p_sys;
 201     int i;
 202
 203     msg_Dbg( p_dec, "cinepak decoder stopped" );
 204
 205     for( i = 0; i < 3; i++ )
 206     {
 207         if( p_sys->context.p_pix[i] ) free( p_sys->context.p_pix[i] );
 208     }
 209
 210     free( p_sys );
 211 }
 212
 213 /*****************************************************************************
 214  * local Functions
 215  *****************************************************************************/
 216
 217 #define GET2BYTES( p ) \
 218     GetWBE( p ); p+= 2;
 219 /* FIXME */
 220 #define GET3BYTES( p ) \
 221     (GetDWBE( p ) >> 8); p+= 3;
 222
 223 #define GET4BYTES( p ) \
 224     GetDWBE( p ); p+= 4;
 225
 226 #define FREE( p ) \
 227     if( p ) free( p )
 228
 229 static void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
 230                                   uint8_t *p_data, int b_grayscale )
 231 {
 232     int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
 233     int i_uv;
 234 #define SCALEBITS 12
 235 #define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
 236
 237     for( i = 0; i < 4; i++ )
 238     {
 239         i_y[i] = (uint8_t)( *(p_data++) );
 240     }
 241     if( b_grayscale )
 242     {
 243         i_u  = (int8_t)( *(p_data++) );
 244         i_v  = (int8_t)( *(p_data++) );
 245     }
 246     else
 247     {
 248         i_u  = 0;
 249         i_v  = 0;
 250     }
 251
 252     /*
 253           | Y  |   | 1 -0.0655  0.0110 | | CY |
 254           | Cb | = | 0  1.1656 -0.0062 | | CU |
 255           | Cr |   | 0  0.0467  1.4187 | | CV |
 256      */
 257     i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
 258     for( i = 0; i < 4; i++ )
 259     {
 260         i_y[i] += i_uv;
 261     }
 262     i_Cb  = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
 263     i_Cr  = ( FIX( 0.0467 ) * i_u + FIX(  1.4187 ) * i_v ) >> SCALEBITS;
 264
 265     for( i = 0; i < 4; i++ )
 266     {
 267         p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
 268     }
 269     p_codebook->i_u  = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
 270     p_codebook->i_v  = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
 271
 272 #undef FIX
 273 #undef SCALEBITS
 274 }
 275
 276 static void cinepak_Getv4( cinepak_context_t *p_context,
 277                            int i_strip, int i_x, int i_y,
 278                            int i_x2, int i_y2, uint8_t *p_data )
 279 {
 280     uint8_t i_index[4];
 281     int i,j;
 282
 283     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 284 #define PIX_SET_Y( x, y, v ) \
 285     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 286
 287 #define PIX_SET_UV( i, p, x, y, v ) \
 288     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 289
 290     for( i = 0; i < 4; i++ )
 291     {
 292         i_index[i] = *(p_data++);
 293     }
 294
 295     /* y plane */
 296     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 297     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 298     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 299
 300     for( i = 0; i < 2; i++ )
 301     {
 302         for( j = 0; j < 2; j ++ )
 303         {
 304             PIX_SET_Y( 2*j + 0, 2*i + 0,
 305                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[0]);
 306             PIX_SET_Y( 2*j + 1, 2*i + 0,
 307                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
 308             PIX_SET_Y( 2*j + 0, 2*i + 1,
 309                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
 310             PIX_SET_Y( 2*j + 1, 2*i + 1,
 311                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
 312
 313             PIX_SET_UV( 1, p_dst_u, j, i,
 314                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
 315             PIX_SET_UV( 2, p_dst_v, j, i,
 316                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
 317         }
 318     }
 319 #undef PIX_SET_Y
 320 #undef PIX_SET_UV
 321 }
 322
 323 static void cinepak_Getv1( cinepak_context_t *p_context,
 324                            int i_strip, int i_x,  int i_y,
 325                            int i_x2, int i_y2, uint8_t *p_data )
 326 {
 327     uint8_t i_index;
 328     int i,j;
 329
 330     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 331 #define PIX_SET_Y( x, y, v ) \
 332     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 333
 334 #define PIX_SET_UV( i,p, x, y, v ) \
 335     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 336
 337     i_index = *(p_data++);
 338
 339     /* y plane */
 340     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 341     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 342     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 343
 344     for( i = 0; i < 2; i++ )
 345     {
 346         for( j = 0; j < 2; j ++ )
 347         {
 348             PIX_SET_Y( 2*j + 0, 2*i + 0,
 349                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 350             PIX_SET_Y( 2*j + 1, 2*i + 0,
 351                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 352             PIX_SET_Y( 2*j + 0, 2*i + 1,
 353                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 354             PIX_SET_Y( 2*j + 1, 2*i + 1,
 355                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 356
 357             PIX_SET_UV( 1,p_dst_u, j, i,
 358                         p_context->codebook_v1[i_strip][i_index].i_u );
 359             PIX_SET_UV( 2,p_dst_v, j, i,
 360                         p_context->codebook_v1[i_strip][i_index].i_v );
 361         }
 362     }
 363
 364 #undef PIX_SET_Y
 365 #undef PIX_SET_UV
 366 }
 367
 368 /*****************************************************************************
 369  * The function that decode one frame
 370  *****************************************************************************/
 371 static int cinepak_decode_frame( cinepak_context_t *p_context,
 372                                  int i_length, uint8_t *p_data )
 373 {
 374     int i_strip;
 375
 376     int i_frame_flags;
 377     int i_frame_size;
 378     int i_width, i_height;
 379     int i_frame_strips;
 380     int i_index;
 381     int i_strip_x1 =0, i_strip_y1=0;
 382     int i_strip_x2 =0, i_strip_y2=0;
 383
 384     if( i_length <= 10 )
 385     {
 386         /* Broken header or no data */
 387         return( -1 );
 388     }
 389
 390     /* get header */
 391     i_frame_flags  = *(p_data++);
 392     i_frame_size = GET3BYTES( p_data );
 393     i_width  = GET2BYTES( p_data );
 394     i_height = GET2BYTES( p_data );
 395     i_frame_strips = GET2BYTES( p_data );
 396
 397     if( !i_frame_size || !i_width || !i_height )
 398     {
 399         /* Broken header */
 400         return( -1 );
 401     }
 402
 403     /* Check if we have a picture buffer with good size */
 404     if( ( p_context->i_width != i_width ) ||
 405         ( p_context->i_height != i_height ) )
 406     {
 407         int i;
 408         for( i = 0; i < 3; i++ )
 409         {
 410             FREE( p_context->p_pix[i] );
 411         }
 412
 413         p_context->i_width = i_width;
 414         p_context->i_height = i_height;
 415
 416         p_context->i_stride[0] = ( i_width + 3 ) & 0xfffc;
 417         p_context->i_stride[1] = p_context->i_stride[2] =
 418                 p_context->i_stride[0] / 2;
 419
 420         p_context->i_lines[0] = ( i_height + 3 ) & 0xfffc;
 421         p_context->i_lines[1] = p_context->i_lines[2] =
 422                 p_context->i_lines[0] /2;
 423
 424         for( i = 0; i < 3; i++ )
 425         {
 426             p_context->p_pix[i] = malloc( p_context->i_stride[i] *
 427                                           p_context->i_lines[i] );
 428             /* Set it to all black */
 429             memset( p_context->p_pix[i], ( i == 0 ) ? 0 : 128 ,
 430                     p_context->i_stride[i] * p_context->i_lines[i] );
 431         }
 432     }
 433
 434     if( i_frame_size != i_length )
 435     {
 436         i_length = __MIN( i_length, i_frame_size );
 437     }
 438     i_length -= 10;
 439
 440     if( i_frame_strips >= CINEPAK_MAXSTRIP )
 441     {
 442         i_frame_strips = CINEPAK_MAXSTRIP;
 443     }
 444
 445     /* Now decode each strip */
 446     for( i_strip = 0; i_strip < i_frame_strips; i_strip++ )
 447     {
 448         int i_strip_id;
 449         int i_strip_size;
 450
 451         if( i_length <= 12 )
 452         {
 453             break;
 454         }
 455
 456         i_strip_id   = GET2BYTES( p_data );
 457         i_strip_size = GET2BYTES( p_data );
 458         i_strip_size = __MIN( i_strip_size, i_length );
 459         /* FIXME I don't really understand how it's work; */
 460         i_strip_y1  = i_strip_y2 + GET2BYTES( p_data );
 461         i_strip_x1  = GET2BYTES( p_data );
 462         i_strip_y2  = i_strip_y2 + GET2BYTES( p_data );
 463         i_strip_x2  = GET2BYTES( p_data );
 464
 465         i_length -= i_strip_size;
 466
 467         i_strip_size -= 12;
 468         /* init codebook , if needed */
 469         if( ( i_strip > 0 )&&( !(i_frame_flags&0x01) ) )
 470         {
 471             memcpy( &p_context->codebook_v1[i_strip],
 472                     &p_context->codebook_v1[i_strip-1],
 473                     sizeof(cinepak_codebook_t[256] ) );
 474
 475             memcpy( &p_context->codebook_v4[i_strip],
 476                     &p_context->codebook_v4[i_strip-1],
 477                     sizeof(cinepak_codebook_t[256] ) );
 478         }
 479
 480         /* Now parse all chunk in this strip */
 481         while( i_strip_size > 0 )
 482         {
 483             cinepak_codebook_t (*p_codebook)[CINEPAK_MAXSTRIP][256];
 484             int i_mode;
 485
 486             int i_chunk_id;
 487             int i_chunk_size;
 488             uint32_t i_vector_flags;
 489             int i_count;
 490             int i;
 491             int i_x, i_y; /* (0,0) begin in fact at (x1,y1) ... */
 492
 493             i_chunk_id   = GET2BYTES( p_data );
 494             i_chunk_size = GET2BYTES( p_data );
 495             i_chunk_size  = __MIN( i_chunk_size, i_strip_size );
 496             i_strip_size -= i_chunk_size;
 497
 498             i_chunk_size -= 4;
 499
 500             i_x = 0;
 501             i_y = 0;
 502             if( i_chunk_size < 0 )
 503             {
 504                 break;
 505             }
 506
 507             switch( i_chunk_id )
 508             {
 509             case( 0x2000 ): /* 12bits v4 Intra*/
 510             case( 0x2200 ): /* 12bits v1 Intra*/
 511             case( 0x2400 ): /* 8bits v4 Intra*/
 512             case( 0x2600 ): /* 8bits v1 Intra */
 513                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 514                 p_codebook = ( i_chunk_id&0x0200 ) ?
 515                                &p_context->codebook_v1 :
 516                                &p_context->codebook_v4;
 517
 518                 i_count = __MIN( i_chunk_size / ( i_mode ? 6 : 4 ), 256 );
 519
 520                 for( i = 0; i < i_count; i++ )
 521                 {
 522                     cinepak_LoadCodebook( &((*p_codebook)[i_strip][i]),
 523                                           p_data,
 524                                           i_mode&~p_context->b_grayscale );
 525                     p_data += i_mode ? 6 : 4;
 526                     i_chunk_size -= i_mode ? 6 : 4;
 527                 }
 528                 break;
 529
 530             case( 0x2100 ): /* selective 12bits v4 Inter*/
 531             case( 0x2300 ): /* selective 12bits v1 Inter*/
 532             case( 0x2500 ): /* selective 8bits v4 Inter*/
 533             case( 0x2700 ): /* selective 8bits v1 Inter*/
 534                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 535                 p_codebook = ( i_chunk_id&0x0200 ) ?
 536                                &p_context->codebook_v1 :
 537                                &p_context->codebook_v4;
 538
 539                 i_index = 0;
 540                 while( (i_chunk_size > 4)&&(i_index<256))
 541                 {
 542                     i_vector_flags = GET4BYTES( p_data );
 543                     i_chunk_size -= 4;
 544                     for( i = 0; i < 32; i++ )
 545                     {
 546                         if( ( i_chunk_size < ( i_mode ? 6 : 4 ) )
 547                             || (i_index >= 256 ) )
 548                         {
 549                             break;
 550                         }
 551                         if( i_vector_flags&0x80000000UL )
 552                         {
 553                             cinepak_LoadCodebook(
 554                                 &((*p_codebook)[i_strip][i_index]),
 555                                 p_data, i_mode&~p_context->b_grayscale );
 556
 557                             p_data += i_mode ? 6 : 4;
 558                             i_chunk_size -= i_mode ? 6 : 4;
 559                         }
 560                         i_index++;
 561                         i_vector_flags <<= 1;
 562                     }
 563                 }
 564                 break;
 565
 566             case( 0x3000 ): /* load image Intra */
 567                 while( (i_chunk_size >= 4 )&&(i_y<i_strip_y2-i_strip_y1) )
 568                 {
 569                     i_vector_flags = GET4BYTES( p_data );
 570                     i_chunk_size -= 4;
 571                     i_strip_size -= 4;
 572                     i_length     -= 4;
 573
 574                     for( i = 0; i < 32; i++ )
 575                     {
 576                         if( ( i_y >= i_strip_y2 - i_strip_y1) ||
 577                             ( i_chunk_size<=0 ) )
 578                         {
 579                             break;
 580                         }
 581                         if( i_vector_flags&0x80000000UL )
 582                         {
 583                             cinepak_Getv4( p_context,
 584                                            i_strip,
 585                                            i_strip_x1 + i_x,
 586                                            i_strip_y1 + i_y,
 587                                            i_strip_x2, i_strip_y2,
 588                                            p_data );
 589                             p_data += 4;
 590                             i_chunk_size -= 4;
 591                         }
 592                         else
 593                         {
 594                             cinepak_Getv1( 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++;
 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                                                i_strip_x2, i_strip_y2,
 647                                                p_data );
 648                                 p_data += 4;
 649                                 i_chunk_size -= 4;
 650                             }
 651                             else
 652                             {
 653                                 if( i_chunk_size < 1 ) break;
 654                                 cinepak_Getv1( p_context,
 655                                                i_strip,
 656                                                i_strip_x1 + i_x,
 657                                                i_strip_y1 + i_y,
 658                                                i_strip_x2, i_strip_y2,
 659                                                p_data );
 660                                 p_data++;
 661                                 i_chunk_size--;
 662                             }
 663                         }
 664                         i_mask >>= 1;
 665
 666                         i_x += 4;
 667                         if( i_x >= i_strip_x2 - i_strip_x1 )
 668                         {
 669                             i_x = 0;
 670                             i_y += 4;
 671                         }
 672                     }
 673                 }
 674                 break;
 675
 676             case( 0x3200 ): /* load intra picture but all v1*/
 677                 while( ( i_chunk_size > 0 ) &&
 678                        ( i_y < i_strip_y2 - i_strip_y1 ) )
 679                 {
 680                     cinepak_Getv1( p_context,
 681                                    i_strip,
 682                                    i_strip_x1 + i_x,
 683                                    i_strip_y1 + i_y,
 684                                    i_strip_x2, i_strip_y2,
 685                                    p_data );
 686                     p_data++;
 687                     i_chunk_size--;
 688
 689                     i_x += 4;
 690                     if( i_x >= i_strip_x2 - i_strip_x1 )
 691                     {
 692                         i_x = 0;
 693                         i_y += 4;
 694                     }
 695                 }
 696                 break;
 697
 698             default:
 699                 break;
 700
 701             }
 702             p_data += i_chunk_size ; /* skip remains bytes */
 703         }
 704     }
 705
 706     return( 0 );
 707 }