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 1.1 2003/10/02 21:12:45 gbazin 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 <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc/vout.h>
  32 #include <vlc/decoder.h>
  33 #include <vlc/input.h>
  34
  35 #define CINEPAK_MAXSTRIP 32
  36
  37 typedef struct cinepak_codebook_s
  38 {
  39     u8 i_y[4];
  40     u8 i_u, i_v;
  41
  42 } cinepak_codebook_t;
  43
  44 typedef struct cinepak_context_s
  45 {
  46     int b_grayscale; /* force to grayscale */
  47
  48     int i_width;
  49     int i_height;
  50
  51     int i_stride_x;
  52     int i_stride_y;
  53
  54     u8  *p_y, *p_u, *p_v;
  55
  56     int i_stride[3]; /* our 3 planes */
  57     int i_lines[3];
  58     u8  *p_pix[3];
  59
  60     cinepak_codebook_t codebook_v1[CINEPAK_MAXSTRIP][256];
  61     cinepak_codebook_t codebook_v4[CINEPAK_MAXSTRIP][256];
  62
  63 } cinepak_context_t;
  64
  65 /*****************************************************************************
  66  * decoder_sys_t : decoder descriptor
  67  *****************************************************************************/
  68 struct decoder_sys_t
  69 {
  70     /*
  71      * Cinepak properties
  72      */
  73     cinepak_context_t *p_context;
  74
  75     /*
  76      * Output properties
  77      */
  78     vout_thread_t *p_vout;
  79 };
  80
  81 /*****************************************************************************
  82  * Local prototypes
  83  *****************************************************************************/
  84 static int OpenDecoder( vlc_object_t * );
  85 static int InitDecoder( decoder_t * );
  86 static int RunDecoder ( decoder_t *, block_t * );
  87 static int EndDecoder ( decoder_t * );
  88
  89 static int cinepak_decode_frame( cinepak_context_t *, int, u8 * );
  90
  91 /*****************************************************************************
  92  * Module descriptor
  93  *****************************************************************************/
  94 vlc_module_begin();
  95     set_description( _("Cinepak video decoder") );
  96     set_capability( "decoder", 70 );
  97     set_callbacks( OpenDecoder, NULL );
  98 vlc_module_end();
  99
 100 /*****************************************************************************
 101  * OpenDecoder: probe the decoder and return score
 102  *****************************************************************************
 103  * Tries to launch a decoder and return score so that the interface is able
 104  * to chose.
 105  *****************************************************************************/
 106 static int OpenDecoder( vlc_object_t *p_this )
 107 {
 108     decoder_t *p_dec = (decoder_t*)p_this;
 109
 110     switch( p_dec->p_fifo->i_fourcc )
 111     {
 112         case VLC_FOURCC('c','v','i','d'):
 113         case VLC_FOURCC('C','V','I','D'):
 114             break;
 115
 116         default:
 117             return VLC_EGENERIC;
 118     }
 119
 120     /* Allocate the memory needed to store the decoder's structure */
 121     if( ( p_dec->p_sys =
 122           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 123     {
 124         msg_Err( p_dec, "out of memory" );
 125         return VLC_EGENERIC;
 126     }
 127
 128     p_dec->pf_init = InitDecoder;
 129     p_dec->pf_decode = RunDecoder;
 130     p_dec->pf_end = EndDecoder;
 131
 132     return VLC_SUCCESS;
 133 }
 134
 135 /*****************************************************************************
 136  * InitDecoder: Initalize the decoder
 137  *****************************************************************************/
 138 static int InitDecoder( decoder_t *p_dec )
 139 {
 140     decoder_sys_t *p_sys = p_dec->p_sys;
 141     vlc_value_t val;
 142
 143     p_sys->p_vout = NULL;
 144
 145     if( !(p_sys->p_context = malloc( sizeof( cinepak_context_t ) ) ) )
 146     {
 147         msg_Err( p_dec, "out of memory" );
 148     }
 149     memset( p_sys->p_context, 0, sizeof( cinepak_context_t ) );
 150
 151     var_Create( p_dec, "grayscale", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 152     var_Get( p_dec, "grayscale", &val );
 153     p_sys->p_context->b_grayscale = val.b_bool;
 154
 155     msg_Dbg( p_dec, "cinepak decoder started" );
 156
 157     return VLC_SUCCESS;
 158 }
 159
 160 /****************************************************************************
 161  * RunDecoder: the whole thing
 162  ****************************************************************************
 163  * This function must be fed with whole frames.
 164  ****************************************************************************/
 165 static int RunDecoder( decoder_t *p_dec, block_t *p_block )
 166 {
 167     decoder_sys_t *p_sys = p_dec->p_sys;
 168     int i_status, i_plane;
 169     u8 *p_dst, *p_src;
 170     picture_t *p_pic;
 171
 172     i_status = cinepak_decode_frame( p_sys->p_context,
 173                                      p_block->i_buffer, p_block->p_buffer );
 174     if( i_status < 0 )
 175     {
 176         msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
 177                   p_block->i_buffer );
 178         block_Release( p_block );
 179         return VLC_SUCCESS;
 180     }
 181
 182     /* Check our vout */
 183     p_sys->p_vout = vout_Request( p_dec, p_sys->p_vout,
 184                                   p_sys->p_context->i_width,
 185                                   p_sys->p_context->i_height,
 186                                   VLC_FOURCC('I','4','2','0'),
 187                                   p_sys->p_context->i_width
 188                                     * VOUT_ASPECT_FACTOR
 189                                     / p_sys->p_context->i_height );
 190     if( !p_sys->p_vout )
 191     {
 192         msg_Err( p_dec, "cannot create vout" );
 193         block_Release( p_block );
 194         return VLC_EGENERIC;
 195     }
 196
 197     /* Send decoded frame to vout */
 198     while( !(p_pic = vout_CreatePicture( p_sys->p_vout, 0, 0, 0 ) ) )
 199     {
 200         if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error )
 201         {
 202             block_Release( p_block );
 203             return VLC_EGENERIC;
 204         }
 205         msleep( VOUT_OUTMEM_SLEEP );
 206     }
 207
 208     for( i_plane = 0; i_plane < 3; i_plane++ )
 209     {
 210         int i_line, i_lines;
 211
 212         p_dst = p_pic->p[i_plane].p_pixels;
 213         p_src = p_sys->p_context->p_pix[i_plane];
 214
 215         i_lines = __MIN( p_sys->p_context->i_lines[i_plane],
 216                          p_pic->p[i_plane].i_lines );
 217         for( i_line = 0; i_line < i_lines; i_line++ )
 218         {
 219             memcpy( p_dst, p_src,
 220                     __MIN( p_pic->p[i_plane].i_pitch,
 221                            p_sys->p_context->i_stride[i_plane] ) );
 222             p_dst += p_pic->p[i_plane].i_pitch;
 223             p_src += p_sys->p_context->i_stride[i_plane];
 224         }
 225     }
 226
 227     vout_DatePicture( p_sys->p_vout, p_pic, p_block->i_pts);
 228     vout_DisplayPicture( p_sys->p_vout, p_pic );
 229
 230     block_Release( p_block );
 231     return VLC_SUCCESS;
 232 }
 233
 234 /*****************************************************************************
 235  * EndDecoder: theora decoder destruction
 236  *****************************************************************************/
 237 static int EndDecoder( decoder_t *p_dec )
 238 {
 239     decoder_sys_t *p_sys = p_dec->p_sys;
 240     int i;
 241
 242     msg_Dbg( p_dec, "cinepak decoder stopped" );
 243
 244     vout_Request( p_dec, p_sys->p_vout, 0, 0, 0, 0 );
 245
 246     for( i = 0; i < 3; i++ )
 247     {
 248         if( p_sys->p_context->p_pix[i] ) free( p_sys->p_context->p_pix[i] );
 249     }
 250
 251     free( p_sys->p_context );
 252
 253     free( p_sys );
 254
 255     return VLC_SUCCESS;
 256 }
 257
 258 /*****************************************************************************
 259  * local Functions
 260  *****************************************************************************/
 261
 262 #define GET2BYTES( p ) \
 263     GetWBE( p ); p+= 2;
 264 /* FIXME */
 265 #define GET3BYTES( p ) \
 266     (GetDWBE( p ) >> 8); p+= 3;
 267
 268 #define GET4BYTES( p ) \
 269     GetDWBE( p ); p+= 4;
 270
 271 #define FREE( p ) \
 272     if( p ) free( p )
 273
 274 static void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
 275                                   u8 *p_data, int b_grayscale )
 276 {
 277     int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
 278     int i_uv;
 279 #define SCALEBITS 12
 280 #define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
 281
 282     for( i = 0; i < 4; i++ )
 283     {
 284         i_y[i] = (u8)( *(p_data++) );
 285     }
 286     if( b_grayscale )
 287     {
 288         i_u  = (s8)( *(p_data++) );
 289         i_v  = (s8)( *(p_data++) );
 290     }
 291     else
 292     {
 293         i_u  = 0;
 294         i_v  = 0;
 295     }
 296
 297     /*
 298           | Y  |   | 1 -0.0655  0.0110 | | CY |
 299           | Cb | = | 0  1.1656 -0.0062 | | CU |
 300           | Cr |   | 0  0.0467  1.4187 | | CV |
 301      */
 302     i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
 303     for( i = 0; i < 4; i++ )
 304     {
 305         i_y[i] += i_uv;
 306     }
 307     i_Cb  = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
 308     i_Cr  = ( FIX( 0.0467 ) * i_u + FIX(  1.4187 ) * i_v ) >> SCALEBITS;
 309
 310     for( i = 0; i < 4; i++ )
 311     {
 312         p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
 313     }
 314     p_codebook->i_u  = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
 315     p_codebook->i_v  = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
 316
 317 #undef FIX
 318 #undef SCALEBITS
 319 }
 320
 321 static void cinepak_Getv4( cinepak_context_t *p_context,
 322                            int i_strip, int i_x, int i_y,
 323                            int i_x2, int i_y2, u8 *p_data )
 324 {
 325     u8 i_index[4];
 326     int i,j;
 327
 328     u8 *p_dst_y, *p_dst_u, *p_dst_v;
 329 #define PIX_SET_Y( x, y, v ) \
 330     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 331
 332 #define PIX_SET_UV( i, p, x, y, v ) \
 333     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 334
 335     for( i = 0; i < 4; i++ )
 336     {
 337         i_index[i] = *(p_data++);
 338     }
 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_v4[i_strip][i_index[j+2*i]].i_y[0]);
 351             PIX_SET_Y( 2*j + 1, 2*i + 0,
 352                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
 353             PIX_SET_Y( 2*j + 0, 2*i + 1,
 354                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
 355             PIX_SET_Y( 2*j + 1, 2*i + 1,
 356                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
 357
 358             PIX_SET_UV( 1, p_dst_u, j, i,
 359                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
 360             PIX_SET_UV( 2, p_dst_v, j, i,
 361                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
 362         }
 363     }
 364 #undef PIX_SET_Y
 365 #undef PIX_SET_UV
 366 }
 367
 368 static void cinepak_Getv1( cinepak_context_t *p_context,
 369                            int i_strip, int i_x,  int i_y,
 370                            int i_x2, int i_y2, u8 *p_data )
 371 {
 372     u8 i_index;
 373     int i,j;
 374
 375     u8 *p_dst_y, *p_dst_u, *p_dst_v;
 376 #define PIX_SET_Y( x, y, v ) \
 377     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 378
 379 #define PIX_SET_UV( i,p, x, y, v ) \
 380     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 381
 382     i_index = *(p_data++);
 383
 384     /* y plane */
 385     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 386     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 387     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 388
 389     for( i = 0; i < 2; i++ )
 390     {
 391         for( j = 0; j < 2; j ++ )
 392         {
 393             PIX_SET_Y( 2*j + 0, 2*i + 0,
 394                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 395             PIX_SET_Y( 2*j + 1, 2*i + 0,
 396                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 397             PIX_SET_Y( 2*j + 0, 2*i + 1,
 398                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 399             PIX_SET_Y( 2*j + 1, 2*i + 1,
 400                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 401
 402             PIX_SET_UV( 1,p_dst_u, j, i,
 403                         p_context->codebook_v1[i_strip][i_index].i_u );
 404             PIX_SET_UV( 2,p_dst_v, j, i,
 405                         p_context->codebook_v1[i_strip][i_index].i_v );
 406         }
 407     }
 408
 409 #undef PIX_SET_Y
 410 #undef PIX_SET_UV
 411 }
 412
 413 /*****************************************************************************
 414  * The function that decode one frame
 415  *****************************************************************************/
 416 static int cinepak_decode_frame( cinepak_context_t *p_context,
 417                                  int i_length, u8 *p_data )
 418 {
 419     int i_strip;
 420
 421     int i_frame_flags;
 422     int i_frame_size;
 423     int i_width, i_height;
 424     int i_frame_strips;
 425     int i_index;
 426     int i_strip_x1 =0, i_strip_y1=0;
 427     int i_strip_x2 =0, i_strip_y2=0;
 428
 429     if( i_length <= 10 )
 430     {
 431         /* Broken header or no data */
 432         return( -1 );
 433     }
 434
 435     /* get header */
 436     i_frame_flags  = *(p_data++);
 437     i_frame_size = GET3BYTES( p_data );
 438     i_width  = GET2BYTES( p_data );
 439     i_height = GET2BYTES( p_data );
 440     i_frame_strips = GET2BYTES( p_data );
 441
 442     if( !i_frame_size || !i_width || !i_height )
 443     {
 444         /* Broken header */
 445         return( -1 );
 446     }
 447
 448     /* Check if we have a picture buffer with good size */
 449     if( ( p_context->i_width != i_width ) ||
 450         ( p_context->i_height != i_height ) )
 451     {
 452         int i;
 453         for( i = 0; i < 3; i++ )
 454         {
 455             FREE( p_context->p_pix[i] );
 456         }
 457
 458         p_context->i_width = i_width;
 459         p_context->i_height = i_height;
 460
 461         p_context->i_stride[0] = ( i_width + 3 ) & 0xfffc;
 462         p_context->i_stride[1] = p_context->i_stride[2] =
 463                 p_context->i_stride[0] / 2;
 464
 465         p_context->i_lines[0] = ( i_height + 3 ) & 0xfffc;
 466         p_context->i_lines[1] = p_context->i_lines[2] =
 467                 p_context->i_lines[0] /2;
 468
 469         for( i = 0; i < 3; i++ )
 470         {
 471             p_context->p_pix[i] = malloc( p_context->i_stride[i] *
 472                                           p_context->i_lines[i] );
 473             /* Set it to all black */
 474             memset( p_context->p_pix[i], ( i == 0 ) ? 0 : 128 ,
 475                     p_context->i_stride[i] * p_context->i_lines[i] );
 476         }
 477     }
 478
 479     if( i_frame_size != i_length )
 480     {
 481         i_length = __MIN( i_length, i_frame_size );
 482     }
 483     i_length -= 10;
 484
 485     if( i_frame_strips >= CINEPAK_MAXSTRIP )
 486     {
 487         i_frame_strips = CINEPAK_MAXSTRIP;
 488     }
 489
 490     /* Now decode each strip */
 491     for( i_strip = 0; i_strip < i_frame_strips; i_strip++ )
 492     {
 493         int i_strip_id;
 494         int i_strip_size;
 495
 496         if( i_length <= 12 )
 497         {
 498             break;
 499         }
 500
 501         i_strip_id   = GET2BYTES( p_data );
 502         i_strip_size = GET2BYTES( p_data );
 503         i_strip_size = __MIN( i_strip_size, i_length );
 504         /* FIXME I don't really understand how it's work; */
 505         i_strip_y1  = i_strip_y2 + GET2BYTES( p_data );
 506         i_strip_x1  = GET2BYTES( p_data );
 507         i_strip_y2  = i_strip_y2 + GET2BYTES( p_data );
 508         i_strip_x2  = GET2BYTES( p_data );
 509
 510         i_length -= i_strip_size;
 511
 512         i_strip_size -= 12;
 513         /* init codebook , if needed */
 514         if( ( i_strip > 0 )&&( !(i_frame_flags&0x01) ) )
 515         {
 516             memcpy( &p_context->codebook_v1[i_strip],
 517                     &p_context->codebook_v1[i_strip-1],
 518                     sizeof(cinepak_codebook_t[256] ) );
 519
 520             memcpy( &p_context->codebook_v4[i_strip],
 521                     &p_context->codebook_v4[i_strip-1],
 522                     sizeof(cinepak_codebook_t[256] ) );
 523         }
 524
 525         /* Now parse all chunk in this strip */
 526         while( i_strip_size > 0 )
 527         {
 528             cinepak_codebook_t (*p_codebook)[CINEPAK_MAXSTRIP][256];
 529             int i_mode;
 530
 531             int i_chunk_id;
 532             int i_chunk_size;
 533             u32 i_vector_flags;
 534             int i_count;
 535             int i;
 536             int i_x, i_y; /* (0,0) begin in fact at (x1,y1) ... */
 537
 538             i_chunk_id   = GET2BYTES( p_data );
 539             i_chunk_size = GET2BYTES( p_data );
 540             i_chunk_size  = __MIN( i_chunk_size, i_strip_size );
 541             i_strip_size -= i_chunk_size;
 542
 543             i_chunk_size -= 4;
 544
 545             i_x = 0;
 546             i_y = 0;
 547             if( i_chunk_size < 0 )
 548             {
 549                 break;
 550             }
 551
 552             switch( i_chunk_id )
 553             {
 554             case( 0x2000 ): /* 12bits v4 Intra*/
 555             case( 0x2200 ): /* 12bits v1 Intra*/
 556             case( 0x2400 ): /* 8bits v4 Intra*/
 557             case( 0x2600 ): /* 8bits v1 Intra */
 558                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 559                 p_codebook = ( i_chunk_id&0x0200 ) ?
 560                                &p_context->codebook_v1 :
 561                                &p_context->codebook_v4;
 562
 563                 i_count = __MIN( i_chunk_size / ( i_mode ? 6 : 4 ), 256 );
 564
 565                 for( i = 0; i < i_count; i++ )
 566                 {
 567                     cinepak_LoadCodebook( &((*p_codebook)[i_strip][i]),
 568                                           p_data,
 569                                           i_mode&~p_context->b_grayscale );
 570                     p_data += i_mode ? 6 : 4;
 571                     i_chunk_size -= i_mode ? 6 : 4;
 572                 }
 573                 break;
 574
 575             case( 0x2100 ): /* selective 12bits v4 Inter*/
 576             case( 0x2300 ): /* selective 12bits v1 Inter*/
 577             case( 0x2500 ): /* selective 8bits v4 Inter*/
 578             case( 0x2700 ): /* selective 8bits v1 Inter*/
 579                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 580                 p_codebook = ( i_chunk_id&0x0200 ) ?
 581                                &p_context->codebook_v1 :
 582                                &p_context->codebook_v4;
 583
 584                 i_index = 0;
 585                 while( (i_chunk_size > 4)&&(i_index<256))
 586                 {
 587                     i_vector_flags = GET4BYTES( p_data );
 588                     i_chunk_size -= 4;
 589                     for( i = 0; i < 32; i++ )
 590                     {
 591                         if( ( i_chunk_size < ( i_mode ? 6 : 4 ) )
 592                             || (i_index >= 256 ) )
 593                         {
 594                             break;
 595                         }
 596                         if( i_vector_flags&0x80000000UL )
 597                         {
 598                             cinepak_LoadCodebook(
 599                                 &((*p_codebook)[i_strip][i_index]),
 600                                 p_data, i_mode&~p_context->b_grayscale );
 601
 602                             p_data += i_mode ? 6 : 4;
 603                             i_chunk_size -= i_mode ? 6 : 4;
 604                         }
 605                         i_index++;
 606                         i_vector_flags <<= 1;
 607                     }
 608                 }
 609                 break;
 610
 611             case( 0x3000 ): /* load image Intra */
 612                 while( (i_chunk_size >= 4 )&&(i_y<i_strip_y2-i_strip_y1) )
 613                 {
 614                     i_vector_flags = GET4BYTES( p_data );
 615                     i_chunk_size -= 4;
 616                     i_strip_size -= 4;
 617                     i_length     -= 4;
 618
 619                     for( i = 0; i < 32; i++ )
 620                     {
 621                         if( ( i_y >= i_strip_y2 - i_strip_y1) ||
 622                             ( i_chunk_size<=0 ) )
 623                         {
 624                             break;
 625                         }
 626                         if( i_vector_flags&0x80000000UL )
 627                         {
 628                             cinepak_Getv4( p_context,
 629                                            i_strip,
 630                                            i_strip_x1 + i_x,
 631                                            i_strip_y1 + i_y,
 632                                            i_strip_x2, i_strip_y2,
 633                                            p_data );
 634                             p_data += 4;
 635                             i_chunk_size -= 4;
 636                         }
 637                         else
 638                         {
 639                             cinepak_Getv1( p_context,
 640                                            i_strip,
 641                                            i_strip_x1 + i_x,
 642                                            i_strip_y1 + i_y,
 643                                            i_strip_x2, i_strip_y2,
 644                                            p_data );
 645                             p_data++;
 646                             i_chunk_size--;
 647                         }
 648
 649                         i_x += 4;
 650                         if( i_x >= i_strip_x2 - i_strip_x1 )
 651                         {
 652                             i_x = 0;
 653                             i_y += 4;
 654                         }
 655                         i_vector_flags <<= 1;
 656                     }
 657                 }
 658                 break;
 659
 660             case( 0x3100 ): /* load image Inter */
 661                 while( ( i_chunk_size > 4 )&&( i_y < i_strip_y2 - i_strip_y1) )
 662                 {
 663                     u32 i_mask;
 664                     i_vector_flags = GET4BYTES( p_data );
 665                     i_chunk_size -= 4;
 666                     i_mask = 0x80000000UL;
 667
 668                     while( (i_chunk_size > 0 ) && ( i_mask )
 669                            && ( i_y < i_strip_y2 - i_strip_y1 ) )
 670                     {
 671                         if( i_vector_flags&i_mask )
 672                         {
 673                             i_mask >>= 1;
 674                             if( !i_mask )
 675                             {
 676                                 if( i_chunk_size < 4 )
 677                                 {
 678                                     break;
 679                                 }
 680                                 i_vector_flags = GET4BYTES( p_data );
 681                                 i_chunk_size -= 4;
 682                                 i_mask = 0x80000000UL;
 683                             }
 684                             if( i_vector_flags&i_mask )
 685                             {
 686                                 if( i_chunk_size < 4 ) break;
 687                                 cinepak_Getv4( p_context,
 688                                                i_strip,
 689                                                i_strip_x1 + i_x,
 690                                                i_strip_y1 + i_y,
 691                                                i_strip_x2, i_strip_y2,
 692                                                p_data );
 693                                 p_data += 4;
 694                                 i_chunk_size -= 4;
 695                             }
 696                             else
 697                             {
 698                                 if( i_chunk_size < 1 ) break;
 699                                 cinepak_Getv1( p_context,
 700                                                i_strip,
 701                                                i_strip_x1 + i_x,
 702                                                i_strip_y1 + i_y,
 703                                                i_strip_x2, i_strip_y2,
 704                                                p_data );
 705                                 p_data++;
 706                                 i_chunk_size--;
 707                             }
 708                         }
 709                         i_mask >>= 1;
 710
 711                         i_x += 4;
 712                         if( i_x >= i_strip_x2 - i_strip_x1 )
 713                         {
 714                             i_x = 0;
 715                             i_y += 4;
 716                         }
 717                     }
 718                 }
 719                 break;
 720
 721             case( 0x3200 ): /* load intra picture but all v1*/
 722                 while( ( i_chunk_size > 0 ) &&
 723                        ( i_y < i_strip_y2 - i_strip_y1 ) )
 724                 {
 725                     cinepak_Getv1( p_context,
 726                                    i_strip,
 727                                    i_strip_x1 + i_x,
 728                                    i_strip_y1 + i_y,
 729                                    i_strip_x2, i_strip_y2,
 730                                    p_data );
 731                     p_data++;
 732                     i_chunk_size--;
 733
 734                     i_x += 4;
 735                     if( i_x >= i_strip_x2 - i_strip_x1 )
 736                     {
 737                         i_x = 0;
 738                         i_y += 4;
 739                     }
 740                 }
 741                 break;
 742
 743             default:
 744                 break;
 745
 746             }
 747             p_data += i_chunk_size ; /* skip remains bytes */
 748         }
 749     }
 750
 751     return( 0 );
 752 }