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: cinepak.c,v 1.4 2003/11/22 23:39:14 fenrir Exp $
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28 #include <vlc/vout.h>
  29 #include <vlc/decoder.h>
  30
  31 #define CINEPAK_MAXSTRIP 32
  32
  33 typedef struct cinepak_codebook_s
  34 {
  35     uint8_t i_y[4];
  36     uint8_t i_u, i_v;
  37
  38 } cinepak_codebook_t;
  39
  40 typedef struct cinepak_context_s
  41 {
  42     int b_grayscale; /* force to grayscale */
  43
  44     int i_width;
  45     int i_height;
  46
  47     int i_stride_x;
  48     int i_stride_y;
  49
  50     uint8_t *p_y, *p_u, *p_v;
  51
  52     int i_stride[3]; /* our 3 planes */
  53     int i_lines[3];
  54     uint8_t *p_pix[3];
  55
  56     cinepak_codebook_t codebook_v1[CINEPAK_MAXSTRIP][256];
  57     cinepak_codebook_t codebook_v4[CINEPAK_MAXSTRIP][256];
  58
  59 } cinepak_context_t;
  60
  61 /*****************************************************************************
  62  * decoder_sys_t : decoder descriptor
  63  *****************************************************************************/
  64 struct decoder_sys_t
  65 {
  66     /*
  67      * Cinepak properties
  68      */
  69     cinepak_context_t *p_context;
  70 };
  71
  72 /*****************************************************************************
  73  * Local prototypes
  74  *****************************************************************************/
  75 static int  OpenDecoder( vlc_object_t * );
  76 static void CloseDecoder( vlc_object_t * );
  77 static picture_t *DecodeBlock ( decoder_t *, block_t ** );
  78
  79 static int cinepak_decode_frame( cinepak_context_t *, int, uint8_t * );
  80
  81 /*****************************************************************************
  82  * Module descriptor
  83  *****************************************************************************/
  84 vlc_module_begin();
  85     set_description( _("Cinepak video decoder") );
  86     set_capability( "decoder", 70 );
  87     set_callbacks( OpenDecoder, CloseDecoder );
  88 vlc_module_end();
  89
  90 /*****************************************************************************
  91  * OpenDecoder: probe the decoder and return score
  92  *****************************************************************************
  93  * Tries to launch a decoder and return score so that the interface is able
  94  * to chose.
  95  *****************************************************************************/
  96 static int OpenDecoder( vlc_object_t *p_this )
  97 {
  98     decoder_t *p_dec = (decoder_t*)p_this;
  99     decoder_sys_t *p_sys;
 100     vlc_value_t val;
 101
 102     switch( p_dec->fmt_in.i_codec )
 103     {
 104         case VLC_FOURCC('c','v','i','d'):
 105         case VLC_FOURCC('C','V','I','D'):
 106             break;
 107
 108         default:
 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 =
 114           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 115     {
 116         msg_Err( p_dec, "out of memory" );
 117         return VLC_EGENERIC;
 118     }
 119
 120     if( !(p_sys->p_context = malloc( sizeof( cinepak_context_t ) ) ) )
 121     {
 122         msg_Err( p_dec, "out of memory" );
 123     }
 124     memset( p_sys->p_context, 0, sizeof( cinepak_context_t ) );
 125
 126     var_Create( p_dec, "grayscale", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 127     var_Get( p_dec, "grayscale", &val );
 128     p_sys->p_context->b_grayscale = val.b_bool;
 129
 130     p_dec->pf_decode_video = DecodeBlock;
 131
 132     msg_Dbg( p_dec, "cinepak decoder started" );
 133
 134     return VLC_SUCCESS;
 135 }
 136
 137 /****************************************************************************
 138  * DecodeBlock: the whole thing
 139  ****************************************************************************
 140  * This function must be fed with whole frames.
 141  ****************************************************************************/
 142 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 143 {
 144     decoder_sys_t *p_sys = p_dec->p_sys;
 145     int i_status, i_plane;
 146     uint8_t *p_dst, *p_src;
 147     picture_t *p_pic;
 148     block_t *p_block;
 149
 150     if( !pp_block || !*pp_block ) return NULL;
 151
 152     p_block = *pp_block;
 153
 154     i_status = cinepak_decode_frame( p_sys->p_context, p_block->i_buffer,
 155                                      p_block->p_buffer );
 156     if( i_status < 0 )
 157     {
 158         msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
 159                   p_block->i_buffer );
 160         block_Release( p_block );
 161         return NULL;
 162     }
 163
 164     p_dec->fmt_out.video.i_width = p_sys->p_context->i_width;
 165     p_dec->fmt_out.video.i_height = p_sys->p_context->i_height;
 166     p_dec->fmt_out.video.i_aspect = p_sys->p_context->i_width
 167         * VOUT_ASPECT_FACTOR / p_sys->p_context->i_height;
 168     p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
 169
 170     /* Get a new picture */
 171     p_pic = p_dec->pf_vout_buffer_new( p_dec );
 172
 173     if( p_pic == NULL )
 174     {
 175         block_Release( p_block );
 176         return NULL;
 177     }
 178
 179     for( i_plane = 0; i_plane < 3; i_plane++ )
 180     {
 181         int i_line, i_lines;
 182
 183         p_dst = p_pic->p[i_plane].p_pixels;
 184         p_src = p_sys->p_context->p_pix[i_plane];
 185
 186         i_lines = __MIN( p_sys->p_context->i_lines[i_plane],
 187                          p_pic->p[i_plane].i_lines );
 188         for( i_line = 0; i_line < i_lines; i_line++ )
 189         {
 190             memcpy( p_dst, p_src,
 191                     __MIN( p_pic->p[i_plane].i_pitch,
 192                            p_sys->p_context->i_stride[i_plane] ) );
 193             p_dst += p_pic->p[i_plane].i_pitch;
 194             p_src += p_sys->p_context->i_stride[i_plane];
 195         }
 196     }
 197
 198     p_pic->date = p_block->i_pts;
 199     block_Release( p_block );
 200
 201     return p_pic;
 202 }
 203
 204 /*****************************************************************************
 205  * CloseDecoder: decoder destruction
 206  *****************************************************************************/
 207 static void CloseDecoder( vlc_object_t *p_this )
 208 {
 209     decoder_t *p_dec = (decoder_t *)p_this;
 210     decoder_sys_t *p_sys = p_dec->p_sys;
 211     int i;
 212
 213     msg_Dbg( p_dec, "cinepak decoder stopped" );
 214
 215     for( i = 0; i < 3; i++ )
 216     {
 217         if( p_sys->p_context->p_pix[i] ) free( p_sys->p_context->p_pix[i] );
 218     }
 219
 220     free( p_sys->p_context );
 221
 222     free( p_sys );
 223 }
 224
 225 /*****************************************************************************
 226  * local Functions
 227  *****************************************************************************/
 228
 229 #define GET2BYTES( p ) \
 230     GetWBE( p ); p+= 2;
 231 /* FIXME */
 232 #define GET3BYTES( p ) \
 233     (GetDWBE( p ) >> 8); p+= 3;
 234
 235 #define GET4BYTES( p ) \
 236     GetDWBE( p ); p+= 4;
 237
 238 #define FREE( p ) \
 239     if( p ) free( p )
 240
 241 static void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
 242                                   uint8_t *p_data, int b_grayscale )
 243 {
 244     int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
 245     int i_uv;
 246 #define SCALEBITS 12
 247 #define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
 248
 249     for( i = 0; i < 4; i++ )
 250     {
 251         i_y[i] = (uint8_t)( *(p_data++) );
 252     }
 253     if( b_grayscale )
 254     {
 255         i_u  = (int8_t)( *(p_data++) );
 256         i_v  = (int8_t)( *(p_data++) );
 257     }
 258     else
 259     {
 260         i_u  = 0;
 261         i_v  = 0;
 262     }
 263
 264     /*
 265           | Y  |   | 1 -0.0655  0.0110 | | CY |
 266           | Cb | = | 0  1.1656 -0.0062 | | CU |
 267           | Cr |   | 0  0.0467  1.4187 | | CV |
 268      */
 269     i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
 270     for( i = 0; i < 4; i++ )
 271     {
 272         i_y[i] += i_uv;
 273     }
 274     i_Cb  = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
 275     i_Cr  = ( FIX( 0.0467 ) * i_u + FIX(  1.4187 ) * i_v ) >> SCALEBITS;
 276
 277     for( i = 0; i < 4; i++ )
 278     {
 279         p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
 280     }
 281     p_codebook->i_u  = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
 282     p_codebook->i_v  = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
 283
 284 #undef FIX
 285 #undef SCALEBITS
 286 }
 287
 288 static void cinepak_Getv4( cinepak_context_t *p_context,
 289                            int i_strip, int i_x, int i_y,
 290                            int i_x2, int i_y2, uint8_t *p_data )
 291 {
 292     uint8_t i_index[4];
 293     int i,j;
 294
 295     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 296 #define PIX_SET_Y( x, y, v ) \
 297     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 298
 299 #define PIX_SET_UV( i, p, x, y, v ) \
 300     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 301
 302     for( i = 0; i < 4; i++ )
 303     {
 304         i_index[i] = *(p_data++);
 305     }
 306
 307     /* y plane */
 308     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 309     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 310     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 311
 312     for( i = 0; i < 2; i++ )
 313     {
 314         for( j = 0; j < 2; j ++ )
 315         {
 316             PIX_SET_Y( 2*j + 0, 2*i + 0,
 317                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[0]);
 318             PIX_SET_Y( 2*j + 1, 2*i + 0,
 319                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
 320             PIX_SET_Y( 2*j + 0, 2*i + 1,
 321                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
 322             PIX_SET_Y( 2*j + 1, 2*i + 1,
 323                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
 324
 325             PIX_SET_UV( 1, p_dst_u, j, i,
 326                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
 327             PIX_SET_UV( 2, p_dst_v, j, i,
 328                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
 329         }
 330     }
 331 #undef PIX_SET_Y
 332 #undef PIX_SET_UV
 333 }
 334
 335 static void cinepak_Getv1( cinepak_context_t *p_context,
 336                            int i_strip, int i_x,  int i_y,
 337                            int i_x2, int i_y2, uint8_t *p_data )
 338 {
 339     uint8_t i_index;
 340     int i,j;
 341
 342     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 343 #define PIX_SET_Y( x, y, v ) \
 344     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 345
 346 #define PIX_SET_UV( i,p, x, y, v ) \
 347     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 348
 349     i_index = *(p_data++);
 350
 351     /* y plane */
 352     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 353     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 354     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 355
 356     for( i = 0; i < 2; i++ )
 357     {
 358         for( j = 0; j < 2; j ++ )
 359         {
 360             PIX_SET_Y( 2*j + 0, 2*i + 0,
 361                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 362             PIX_SET_Y( 2*j + 1, 2*i + 0,
 363                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 364             PIX_SET_Y( 2*j + 0, 2*i + 1,
 365                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 366             PIX_SET_Y( 2*j + 1, 2*i + 1,
 367                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 368
 369             PIX_SET_UV( 1,p_dst_u, j, i,
 370                         p_context->codebook_v1[i_strip][i_index].i_u );
 371             PIX_SET_UV( 2,p_dst_v, j, i,
 372                         p_context->codebook_v1[i_strip][i_index].i_v );
 373         }
 374     }
 375
 376 #undef PIX_SET_Y
 377 #undef PIX_SET_UV
 378 }
 379
 380 /*****************************************************************************
 381  * The function that decode one frame
 382  *****************************************************************************/
 383 static int cinepak_decode_frame( cinepak_context_t *p_context,
 384                                  int i_length, uint8_t *p_data )
 385 {
 386     int i_strip;
 387
 388     int i_frame_flags;
 389     int i_frame_size;
 390     int i_width, i_height;
 391     int i_frame_strips;
 392     int i_index;
 393     int i_strip_x1 =0, i_strip_y1=0;
 394     int i_strip_x2 =0, i_strip_y2=0;
 395
 396     if( i_length <= 10 )
 397     {
 398         /* Broken header or no data */
 399         return( -1 );
 400     }
 401
 402     /* get header */
 403     i_frame_flags  = *(p_data++);
 404     i_frame_size = GET3BYTES( p_data );
 405     i_width  = GET2BYTES( p_data );
 406     i_height = GET2BYTES( p_data );
 407     i_frame_strips = GET2BYTES( p_data );
 408
 409     if( !i_frame_size || !i_width || !i_height )
 410     {
 411         /* Broken header */
 412         return( -1 );
 413     }
 414
 415     /* Check if we have a picture buffer with good size */
 416     if( ( p_context->i_width != i_width ) ||
 417         ( p_context->i_height != i_height ) )
 418     {
 419         int i;
 420         for( i = 0; i < 3; i++ )
 421         {
 422             FREE( p_context->p_pix[i] );
 423         }
 424
 425         p_context->i_width = i_width;
 426         p_context->i_height = i_height;
 427
 428         p_context->i_stride[0] = ( i_width + 3 ) & 0xfffc;
 429         p_context->i_stride[1] = p_context->i_stride[2] =
 430                 p_context->i_stride[0] / 2;
 431
 432         p_context->i_lines[0] = ( i_height + 3 ) & 0xfffc;
 433         p_context->i_lines[1] = p_context->i_lines[2] =
 434                 p_context->i_lines[0] /2;
 435
 436         for( i = 0; i < 3; i++ )
 437         {
 438             p_context->p_pix[i] = malloc( p_context->i_stride[i] *
 439                                           p_context->i_lines[i] );
 440             /* Set it to all black */
 441             memset( p_context->p_pix[i], ( i == 0 ) ? 0 : 128 ,
 442                     p_context->i_stride[i] * p_context->i_lines[i] );
 443         }
 444     }
 445
 446     if( i_frame_size != i_length )
 447     {
 448         i_length = __MIN( i_length, i_frame_size );
 449     }
 450     i_length -= 10;
 451
 452     if( i_frame_strips >= CINEPAK_MAXSTRIP )
 453     {
 454         i_frame_strips = CINEPAK_MAXSTRIP;
 455     }
 456
 457     /* Now decode each strip */
 458     for( i_strip = 0; i_strip < i_frame_strips; i_strip++ )
 459     {
 460         int i_strip_id;
 461         int i_strip_size;
 462
 463         if( i_length <= 12 )
 464         {
 465             break;
 466         }
 467
 468         i_strip_id   = GET2BYTES( p_data );
 469         i_strip_size = GET2BYTES( p_data );
 470         i_strip_size = __MIN( i_strip_size, i_length );
 471         /* FIXME I don't really understand how it's work; */
 472         i_strip_y1  = i_strip_y2 + GET2BYTES( p_data );
 473         i_strip_x1  = GET2BYTES( p_data );
 474         i_strip_y2  = i_strip_y2 + GET2BYTES( p_data );
 475         i_strip_x2  = GET2BYTES( p_data );
 476
 477         i_length -= i_strip_size;
 478
 479         i_strip_size -= 12;
 480         /* init codebook , if needed */
 481         if( ( i_strip > 0 )&&( !(i_frame_flags&0x01) ) )
 482         {
 483             memcpy( &p_context->codebook_v1[i_strip],
 484                     &p_context->codebook_v1[i_strip-1],
 485                     sizeof(cinepak_codebook_t[256] ) );
 486
 487             memcpy( &p_context->codebook_v4[i_strip],
 488                     &p_context->codebook_v4[i_strip-1],
 489                     sizeof(cinepak_codebook_t[256] ) );
 490         }
 491
 492         /* Now parse all chunk in this strip */
 493         while( i_strip_size > 0 )
 494         {
 495             cinepak_codebook_t (*p_codebook)[CINEPAK_MAXSTRIP][256];
 496             int i_mode;
 497
 498             int i_chunk_id;
 499             int i_chunk_size;
 500             uint32_t i_vector_flags;
 501             int i_count;
 502             int i;
 503             int i_x, i_y; /* (0,0) begin in fact at (x1,y1) ... */
 504
 505             i_chunk_id   = GET2BYTES( p_data );
 506             i_chunk_size = GET2BYTES( p_data );
 507             i_chunk_size  = __MIN( i_chunk_size, i_strip_size );
 508             i_strip_size -= i_chunk_size;
 509
 510             i_chunk_size -= 4;
 511
 512             i_x = 0;
 513             i_y = 0;
 514             if( i_chunk_size < 0 )
 515             {
 516                 break;
 517             }
 518
 519             switch( i_chunk_id )
 520             {
 521             case( 0x2000 ): /* 12bits v4 Intra*/
 522             case( 0x2200 ): /* 12bits v1 Intra*/
 523             case( 0x2400 ): /* 8bits v4 Intra*/
 524             case( 0x2600 ): /* 8bits v1 Intra */
 525                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 526                 p_codebook = ( i_chunk_id&0x0200 ) ?
 527                                &p_context->codebook_v1 :
 528                                &p_context->codebook_v4;
 529
 530                 i_count = __MIN( i_chunk_size / ( i_mode ? 6 : 4 ), 256 );
 531
 532                 for( i = 0; i < i_count; i++ )
 533                 {
 534                     cinepak_LoadCodebook( &((*p_codebook)[i_strip][i]),
 535                                           p_data,
 536                                           i_mode&~p_context->b_grayscale );
 537                     p_data += i_mode ? 6 : 4;
 538                     i_chunk_size -= i_mode ? 6 : 4;
 539                 }
 540                 break;
 541
 542             case( 0x2100 ): /* selective 12bits v4 Inter*/
 543             case( 0x2300 ): /* selective 12bits v1 Inter*/
 544             case( 0x2500 ): /* selective 8bits v4 Inter*/
 545             case( 0x2700 ): /* selective 8bits v1 Inter*/
 546                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 547                 p_codebook = ( i_chunk_id&0x0200 ) ?
 548                                &p_context->codebook_v1 :
 549                                &p_context->codebook_v4;
 550
 551                 i_index = 0;
 552                 while( (i_chunk_size > 4)&&(i_index<256))
 553                 {
 554                     i_vector_flags = GET4BYTES( p_data );
 555                     i_chunk_size -= 4;
 556                     for( i = 0; i < 32; i++ )
 557                     {
 558                         if( ( i_chunk_size < ( i_mode ? 6 : 4 ) )
 559                             || (i_index >= 256 ) )
 560                         {
 561                             break;
 562                         }
 563                         if( i_vector_flags&0x80000000UL )
 564                         {
 565                             cinepak_LoadCodebook(
 566                                 &((*p_codebook)[i_strip][i_index]),
 567                                 p_data, i_mode&~p_context->b_grayscale );
 568
 569                             p_data += i_mode ? 6 : 4;
 570                             i_chunk_size -= i_mode ? 6 : 4;
 571                         }
 572                         i_index++;
 573                         i_vector_flags <<= 1;
 574                     }
 575                 }
 576                 break;
 577
 578             case( 0x3000 ): /* load image Intra */
 579                 while( (i_chunk_size >= 4 )&&(i_y<i_strip_y2-i_strip_y1) )
 580                 {
 581                     i_vector_flags = GET4BYTES( p_data );
 582                     i_chunk_size -= 4;
 583                     i_strip_size -= 4;
 584                     i_length     -= 4;
 585
 586                     for( i = 0; i < 32; i++ )
 587                     {
 588                         if( ( i_y >= i_strip_y2 - i_strip_y1) ||
 589                             ( i_chunk_size<=0 ) )
 590                         {
 591                             break;
 592                         }
 593                         if( i_vector_flags&0x80000000UL )
 594                         {
 595                             cinepak_Getv4( p_context,
 596                                            i_strip,
 597                                            i_strip_x1 + i_x,
 598                                            i_strip_y1 + i_y,
 599                                            i_strip_x2, i_strip_y2,
 600                                            p_data );
 601                             p_data += 4;
 602                             i_chunk_size -= 4;
 603                         }
 604                         else
 605                         {
 606                             cinepak_Getv1( p_context,
 607                                            i_strip,
 608                                            i_strip_x1 + i_x,
 609                                            i_strip_y1 + i_y,
 610                                            i_strip_x2, i_strip_y2,
 611                                            p_data );
 612                             p_data++;
 613                             i_chunk_size--;
 614                         }
 615
 616                         i_x += 4;
 617                         if( i_x >= i_strip_x2 - i_strip_x1 )
 618                         {
 619                             i_x = 0;
 620                             i_y += 4;
 621                         }
 622                         i_vector_flags <<= 1;
 623                     }
 624                 }
 625                 break;
 626
 627             case( 0x3100 ): /* load image Inter */
 628                 while( ( i_chunk_size > 4 )&&( i_y < i_strip_y2 - i_strip_y1) )
 629                 {
 630                     uint32_t i_mask;
 631                     i_vector_flags = GET4BYTES( p_data );
 632                     i_chunk_size -= 4;
 633                     i_mask = 0x80000000UL;
 634
 635                     while( (i_chunk_size > 0 ) && ( i_mask )
 636                            && ( i_y < i_strip_y2 - i_strip_y1 ) )
 637                     {
 638                         if( i_vector_flags&i_mask )
 639                         {
 640                             i_mask >>= 1;
 641                             if( !i_mask )
 642                             {
 643                                 if( i_chunk_size < 4 )
 644                                 {
 645                                     break;
 646                                 }
 647                                 i_vector_flags = GET4BYTES( p_data );
 648                                 i_chunk_size -= 4;
 649                                 i_mask = 0x80000000UL;
 650                             }
 651                             if( i_vector_flags&i_mask )
 652                             {
 653                                 if( i_chunk_size < 4 ) break;
 654                                 cinepak_Getv4( 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 += 4;
 661                                 i_chunk_size -= 4;
 662                             }
 663                             else
 664                             {
 665                                 if( i_chunk_size < 1 ) break;
 666                                 cinepak_Getv1( p_context,
 667                                                i_strip,
 668                                                i_strip_x1 + i_x,
 669                                                i_strip_y1 + i_y,
 670                                                i_strip_x2, i_strip_y2,
 671                                                p_data );
 672                                 p_data++;
 673                                 i_chunk_size--;
 674                             }
 675                         }
 676                         i_mask >>= 1;
 677
 678                         i_x += 4;
 679                         if( i_x >= i_strip_x2 - i_strip_x1 )
 680                         {
 681                             i_x = 0;
 682                             i_y += 4;
 683                         }
 684                     }
 685                 }
 686                 break;
 687
 688             case( 0x3200 ): /* load intra picture but all v1*/
 689                 while( ( i_chunk_size > 0 ) &&
 690                        ( i_y < i_strip_y2 - i_strip_y1 ) )
 691                 {
 692                     cinepak_Getv1( p_context,
 693                                    i_strip,
 694                                    i_strip_x1 + i_x,
 695                                    i_strip_y1 + i_y,
 696                                    i_strip_x2, i_strip_y2,
 697                                    p_data );
 698                     p_data++;
 699                     i_chunk_size--;
 700
 701                     i_x += 4;
 702                     if( i_x >= i_strip_x2 - i_strip_x1 )
 703                     {
 704                         i_x = 0;
 705                         i_y += 4;
 706                     }
 707                 }
 708                 break;
 709
 710             default:
 711                 break;
 712
 713             }
 714             p_data += i_chunk_size ; /* skip remains bytes */
 715         }
 716     }
 717
 718     return( 0 );
 719 }