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 1.3 2003/11/16 21:07:30 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     uint8_t i_y[4];
  40     uint8_t 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     uint8_t *p_y, *p_u, *p_v;
  55
  56     int i_stride[3]; /* our 3 planes */
  57     int i_lines[3];
  58     uint8_t *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 /*****************************************************************************
  77  * Local prototypes
  78  *****************************************************************************/
  79 static int  OpenDecoder( vlc_object_t * );
  80 static void CloseDecoder( vlc_object_t * );
  81 static picture_t *DecodeBlock ( decoder_t *, block_t ** );
  82
  83 static int cinepak_decode_frame( cinepak_context_t *, int, uint8_t * );
  84
  85 /*****************************************************************************
  86  * Module descriptor
  87  *****************************************************************************/
  88 vlc_module_begin();
  89     set_description( _("Cinepak video decoder") );
  90     set_capability( "decoder", 70 );
  91     set_callbacks( OpenDecoder, CloseDecoder );
  92 vlc_module_end();
  93
  94 /*****************************************************************************
  95  * OpenDecoder: probe the decoder and return score
  96  *****************************************************************************
  97  * Tries to launch a decoder and return score so that the interface is able
  98  * to chose.
  99  *****************************************************************************/
 100 static int OpenDecoder( vlc_object_t *p_this )
 101 {
 102     decoder_t *p_dec = (decoder_t*)p_this;
 103     decoder_sys_t *p_sys;
 104     vlc_value_t val;
 105
 106     switch( p_dec->fmt_in.i_codec )
 107     {
 108         case VLC_FOURCC('c','v','i','d'):
 109         case VLC_FOURCC('C','V','I','D'):
 110             break;
 111
 112         default:
 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 =
 118           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 119     {
 120         msg_Err( p_dec, "out of memory" );
 121         return VLC_EGENERIC;
 122     }
 123
 124     if( !(p_sys->p_context = malloc( sizeof( cinepak_context_t ) ) ) )
 125     {
 126         msg_Err( p_dec, "out of memory" );
 127     }
 128     memset( p_sys->p_context, 0, sizeof( cinepak_context_t ) );
 129
 130     var_Create( p_dec, "grayscale", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 131     var_Get( p_dec, "grayscale", &val );
 132     p_sys->p_context->b_grayscale = val.b_bool;
 133
 134     p_dec->pf_decode_video = DecodeBlock;
 135
 136     msg_Dbg( p_dec, "cinepak decoder started" );
 137
 138     return VLC_SUCCESS;
 139 }
 140
 141 /****************************************************************************
 142  * DecodeBlock: the whole thing
 143  ****************************************************************************
 144  * This function must be fed with whole frames.
 145  ****************************************************************************/
 146 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 147 {
 148     decoder_sys_t *p_sys = p_dec->p_sys;
 149     int i_status, i_plane;
 150     uint8_t *p_dst, *p_src;
 151     picture_t *p_pic;
 152     block_t *p_block;
 153
 154     if( !pp_block || !*pp_block ) return NULL;
 155
 156     p_block = *pp_block;
 157
 158     i_status = cinepak_decode_frame( p_sys->p_context, p_block->i_buffer,
 159                                      p_block->p_buffer );
 160     if( i_status < 0 )
 161     {
 162         msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
 163                   p_block->i_buffer );
 164         block_Release( p_block );
 165         return NULL;
 166     }
 167
 168     p_dec->fmt_out.video.i_width = p_sys->p_context->i_width;
 169     p_dec->fmt_out.video.i_height = p_sys->p_context->i_height;
 170     p_dec->fmt_out.video.i_aspect = p_sys->p_context->i_width
 171         * VOUT_ASPECT_FACTOR / p_sys->p_context->i_height;
 172     p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
 173
 174     /* Get a new picture */
 175     p_pic = p_dec->pf_vout_buffer_new( p_dec );
 176
 177     if( p_pic == NULL )
 178     {
 179         block_Release( p_block );
 180         return NULL;
 181     }
 182
 183     for( i_plane = 0; i_plane < 3; i_plane++ )
 184     {
 185         int i_line, i_lines;
 186
 187         p_dst = p_pic->p[i_plane].p_pixels;
 188         p_src = p_sys->p_context->p_pix[i_plane];
 189
 190         i_lines = __MIN( p_sys->p_context->i_lines[i_plane],
 191                          p_pic->p[i_plane].i_lines );
 192         for( i_line = 0; i_line < i_lines; i_line++ )
 193         {
 194             memcpy( p_dst, p_src,
 195                     __MIN( p_pic->p[i_plane].i_pitch,
 196                            p_sys->p_context->i_stride[i_plane] ) );
 197             p_dst += p_pic->p[i_plane].i_pitch;
 198             p_src += p_sys->p_context->i_stride[i_plane];
 199         }
 200     }
 201
 202     p_pic->date = p_block->i_pts;
 203     block_Release( p_block );
 204
 205     return p_pic;
 206 }
 207
 208 /*****************************************************************************
 209  * CloseDecoder: decoder destruction
 210  *****************************************************************************/
 211 static void CloseDecoder( vlc_object_t *p_this )
 212 {
 213     decoder_t *p_dec = (decoder_t *)p_this;
 214     decoder_sys_t *p_sys = p_dec->p_sys;
 215     int i;
 216
 217     msg_Dbg( p_dec, "cinepak decoder stopped" );
 218
 219     for( i = 0; i < 3; i++ )
 220     {
 221         if( p_sys->p_context->p_pix[i] ) free( p_sys->p_context->p_pix[i] );
 222     }
 223
 224     free( p_sys->p_context );
 225
 226     free( p_sys );
 227 }
 228
 229 /*****************************************************************************
 230  * local Functions
 231  *****************************************************************************/
 232
 233 #define GET2BYTES( p ) \
 234     GetWBE( p ); p+= 2;
 235 /* FIXME */
 236 #define GET3BYTES( p ) \
 237     (GetDWBE( p ) >> 8); p+= 3;
 238
 239 #define GET4BYTES( p ) \
 240     GetDWBE( p ); p+= 4;
 241
 242 #define FREE( p ) \
 243     if( p ) free( p )
 244
 245 static void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
 246                                   uint8_t *p_data, int b_grayscale )
 247 {
 248     int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
 249     int i_uv;
 250 #define SCALEBITS 12
 251 #define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
 252
 253     for( i = 0; i < 4; i++ )
 254     {
 255         i_y[i] = (uint8_t)( *(p_data++) );
 256     }
 257     if( b_grayscale )
 258     {
 259         i_u  = (int8_t)( *(p_data++) );
 260         i_v  = (int8_t)( *(p_data++) );
 261     }
 262     else
 263     {
 264         i_u  = 0;
 265         i_v  = 0;
 266     }
 267
 268     /*
 269           | Y  |   | 1 -0.0655  0.0110 | | CY |
 270           | Cb | = | 0  1.1656 -0.0062 | | CU |
 271           | Cr |   | 0  0.0467  1.4187 | | CV |
 272      */
 273     i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
 274     for( i = 0; i < 4; i++ )
 275     {
 276         i_y[i] += i_uv;
 277     }
 278     i_Cb  = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
 279     i_Cr  = ( FIX( 0.0467 ) * i_u + FIX(  1.4187 ) * i_v ) >> SCALEBITS;
 280
 281     for( i = 0; i < 4; i++ )
 282     {
 283         p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
 284     }
 285     p_codebook->i_u  = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
 286     p_codebook->i_v  = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
 287
 288 #undef FIX
 289 #undef SCALEBITS
 290 }
 291
 292 static void cinepak_Getv4( cinepak_context_t *p_context,
 293                            int i_strip, int i_x, int i_y,
 294                            int i_x2, int i_y2, uint8_t *p_data )
 295 {
 296     uint8_t i_index[4];
 297     int i,j;
 298
 299     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 300 #define PIX_SET_Y( x, y, v ) \
 301     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 302
 303 #define PIX_SET_UV( i, p, x, y, v ) \
 304     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 305
 306     for( i = 0; i < 4; i++ )
 307     {
 308         i_index[i] = *(p_data++);
 309     }
 310
 311     /* y plane */
 312     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 313     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 314     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 315
 316     for( i = 0; i < 2; i++ )
 317     {
 318         for( j = 0; j < 2; j ++ )
 319         {
 320             PIX_SET_Y( 2*j + 0, 2*i + 0,
 321                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[0]);
 322             PIX_SET_Y( 2*j + 1, 2*i + 0,
 323                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
 324             PIX_SET_Y( 2*j + 0, 2*i + 1,
 325                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
 326             PIX_SET_Y( 2*j + 1, 2*i + 1,
 327                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
 328
 329             PIX_SET_UV( 1, p_dst_u, j, i,
 330                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
 331             PIX_SET_UV( 2, p_dst_v, j, i,
 332                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
 333         }
 334     }
 335 #undef PIX_SET_Y
 336 #undef PIX_SET_UV
 337 }
 338
 339 static void cinepak_Getv1( cinepak_context_t *p_context,
 340                            int i_strip, int i_x,  int i_y,
 341                            int i_x2, int i_y2, uint8_t *p_data )
 342 {
 343     uint8_t i_index;
 344     int i,j;
 345
 346     uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
 347 #define PIX_SET_Y( x, y, v ) \
 348     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 349
 350 #define PIX_SET_UV( i,p, x, y, v ) \
 351     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 352
 353     i_index = *(p_data++);
 354
 355     /* y plane */
 356     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 357     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 358     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 359
 360     for( i = 0; i < 2; i++ )
 361     {
 362         for( j = 0; j < 2; j ++ )
 363         {
 364             PIX_SET_Y( 2*j + 0, 2*i + 0,
 365                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 366             PIX_SET_Y( 2*j + 1, 2*i + 0,
 367                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 368             PIX_SET_Y( 2*j + 0, 2*i + 1,
 369                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 370             PIX_SET_Y( 2*j + 1, 2*i + 1,
 371                        p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
 372
 373             PIX_SET_UV( 1,p_dst_u, j, i,
 374                         p_context->codebook_v1[i_strip][i_index].i_u );
 375             PIX_SET_UV( 2,p_dst_v, j, i,
 376                         p_context->codebook_v1[i_strip][i_index].i_v );
 377         }
 378     }
 379
 380 #undef PIX_SET_Y
 381 #undef PIX_SET_UV
 382 }
 383
 384 /*****************************************************************************
 385  * The function that decode one frame
 386  *****************************************************************************/
 387 static int cinepak_decode_frame( cinepak_context_t *p_context,
 388                                  int i_length, uint8_t *p_data )
 389 {
 390     int i_strip;
 391
 392     int i_frame_flags;
 393     int i_frame_size;
 394     int i_width, i_height;
 395     int i_frame_strips;
 396     int i_index;
 397     int i_strip_x1 =0, i_strip_y1=0;
 398     int i_strip_x2 =0, i_strip_y2=0;
 399
 400     if( i_length <= 10 )
 401     {
 402         /* Broken header or no data */
 403         return( -1 );
 404     }
 405
 406     /* get header */
 407     i_frame_flags  = *(p_data++);
 408     i_frame_size = GET3BYTES( p_data );
 409     i_width  = GET2BYTES( p_data );
 410     i_height = GET2BYTES( p_data );
 411     i_frame_strips = GET2BYTES( p_data );
 412
 413     if( !i_frame_size || !i_width || !i_height )
 414     {
 415         /* Broken header */
 416         return( -1 );
 417     }
 418
 419     /* Check if we have a picture buffer with good size */
 420     if( ( p_context->i_width != i_width ) ||
 421         ( p_context->i_height != i_height ) )
 422     {
 423         int i;
 424         for( i = 0; i < 3; i++ )
 425         {
 426             FREE( p_context->p_pix[i] );
 427         }
 428
 429         p_context->i_width = i_width;
 430         p_context->i_height = i_height;
 431
 432         p_context->i_stride[0] = ( i_width + 3 ) & 0xfffc;
 433         p_context->i_stride[1] = p_context->i_stride[2] =
 434                 p_context->i_stride[0] / 2;
 435
 436         p_context->i_lines[0] = ( i_height + 3 ) & 0xfffc;
 437         p_context->i_lines[1] = p_context->i_lines[2] =
 438                 p_context->i_lines[0] /2;
 439
 440         for( i = 0; i < 3; i++ )
 441         {
 442             p_context->p_pix[i] = malloc( p_context->i_stride[i] *
 443                                           p_context->i_lines[i] );
 444             /* Set it to all black */
 445             memset( p_context->p_pix[i], ( i == 0 ) ? 0 : 128 ,
 446                     p_context->i_stride[i] * p_context->i_lines[i] );
 447         }
 448     }
 449
 450     if( i_frame_size != i_length )
 451     {
 452         i_length = __MIN( i_length, i_frame_size );
 453     }
 454     i_length -= 10;
 455
 456     if( i_frame_strips >= CINEPAK_MAXSTRIP )
 457     {
 458         i_frame_strips = CINEPAK_MAXSTRIP;
 459     }
 460
 461     /* Now decode each strip */
 462     for( i_strip = 0; i_strip < i_frame_strips; i_strip++ )
 463     {
 464         int i_strip_id;
 465         int i_strip_size;
 466
 467         if( i_length <= 12 )
 468         {
 469             break;
 470         }
 471
 472         i_strip_id   = GET2BYTES( p_data );
 473         i_strip_size = GET2BYTES( p_data );
 474         i_strip_size = __MIN( i_strip_size, i_length );
 475         /* FIXME I don't really understand how it's work; */
 476         i_strip_y1  = i_strip_y2 + GET2BYTES( p_data );
 477         i_strip_x1  = GET2BYTES( p_data );
 478         i_strip_y2  = i_strip_y2 + GET2BYTES( p_data );
 479         i_strip_x2  = GET2BYTES( p_data );
 480
 481         i_length -= i_strip_size;
 482
 483         i_strip_size -= 12;
 484         /* init codebook , if needed */
 485         if( ( i_strip > 0 )&&( !(i_frame_flags&0x01) ) )
 486         {
 487             memcpy( &p_context->codebook_v1[i_strip],
 488                     &p_context->codebook_v1[i_strip-1],
 489                     sizeof(cinepak_codebook_t[256] ) );
 490
 491             memcpy( &p_context->codebook_v4[i_strip],
 492                     &p_context->codebook_v4[i_strip-1],
 493                     sizeof(cinepak_codebook_t[256] ) );
 494         }
 495
 496         /* Now parse all chunk in this strip */
 497         while( i_strip_size > 0 )
 498         {
 499             cinepak_codebook_t (*p_codebook)[CINEPAK_MAXSTRIP][256];
 500             int i_mode;
 501
 502             int i_chunk_id;
 503             int i_chunk_size;
 504             uint32_t i_vector_flags;
 505             int i_count;
 506             int i;
 507             int i_x, i_y; /* (0,0) begin in fact at (x1,y1) ... */
 508
 509             i_chunk_id   = GET2BYTES( p_data );
 510             i_chunk_size = GET2BYTES( p_data );
 511             i_chunk_size  = __MIN( i_chunk_size, i_strip_size );
 512             i_strip_size -= i_chunk_size;
 513
 514             i_chunk_size -= 4;
 515
 516             i_x = 0;
 517             i_y = 0;
 518             if( i_chunk_size < 0 )
 519             {
 520                 break;
 521             }
 522
 523             switch( i_chunk_id )
 524             {
 525             case( 0x2000 ): /* 12bits v4 Intra*/
 526             case( 0x2200 ): /* 12bits v1 Intra*/
 527             case( 0x2400 ): /* 8bits v4 Intra*/
 528             case( 0x2600 ): /* 8bits v1 Intra */
 529                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 530                 p_codebook = ( i_chunk_id&0x0200 ) ?
 531                                &p_context->codebook_v1 :
 532                                &p_context->codebook_v4;
 533
 534                 i_count = __MIN( i_chunk_size / ( i_mode ? 6 : 4 ), 256 );
 535
 536                 for( i = 0; i < i_count; i++ )
 537                 {
 538                     cinepak_LoadCodebook( &((*p_codebook)[i_strip][i]),
 539                                           p_data,
 540                                           i_mode&~p_context->b_grayscale );
 541                     p_data += i_mode ? 6 : 4;
 542                     i_chunk_size -= i_mode ? 6 : 4;
 543                 }
 544                 break;
 545
 546             case( 0x2100 ): /* selective 12bits v4 Inter*/
 547             case( 0x2300 ): /* selective 12bits v1 Inter*/
 548             case( 0x2500 ): /* selective 8bits v4 Inter*/
 549             case( 0x2700 ): /* selective 8bits v1 Inter*/
 550                 i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 551                 p_codebook = ( i_chunk_id&0x0200 ) ?
 552                                &p_context->codebook_v1 :
 553                                &p_context->codebook_v4;
 554
 555                 i_index = 0;
 556                 while( (i_chunk_size > 4)&&(i_index<256))
 557                 {
 558                     i_vector_flags = GET4BYTES( p_data );
 559                     i_chunk_size -= 4;
 560                     for( i = 0; i < 32; i++ )
 561                     {
 562                         if( ( i_chunk_size < ( i_mode ? 6 : 4 ) )
 563                             || (i_index >= 256 ) )
 564                         {
 565                             break;
 566                         }
 567                         if( i_vector_flags&0x80000000UL )
 568                         {
 569                             cinepak_LoadCodebook(
 570                                 &((*p_codebook)[i_strip][i_index]),
 571                                 p_data, i_mode&~p_context->b_grayscale );
 572
 573                             p_data += i_mode ? 6 : 4;
 574                             i_chunk_size -= i_mode ? 6 : 4;
 575                         }
 576                         i_index++;
 577                         i_vector_flags <<= 1;
 578                     }
 579                 }
 580                 break;
 581
 582             case( 0x3000 ): /* load image Intra */
 583                 while( (i_chunk_size >= 4 )&&(i_y<i_strip_y2-i_strip_y1) )
 584                 {
 585                     i_vector_flags = GET4BYTES( p_data );
 586                     i_chunk_size -= 4;
 587                     i_strip_size -= 4;
 588                     i_length     -= 4;
 589
 590                     for( i = 0; i < 32; i++ )
 591                     {
 592                         if( ( i_y >= i_strip_y2 - i_strip_y1) ||
 593                             ( i_chunk_size<=0 ) )
 594                         {
 595                             break;
 596                         }
 597                         if( i_vector_flags&0x80000000UL )
 598                         {
 599                             cinepak_Getv4( p_context,
 600                                            i_strip,
 601                                            i_strip_x1 + i_x,
 602                                            i_strip_y1 + i_y,
 603                                            i_strip_x2, i_strip_y2,
 604                                            p_data );
 605                             p_data += 4;
 606                             i_chunk_size -= 4;
 607                         }
 608                         else
 609                         {
 610                             cinepak_Getv1( p_context,
 611                                            i_strip,
 612                                            i_strip_x1 + i_x,
 613                                            i_strip_y1 + i_y,
 614                                            i_strip_x2, i_strip_y2,
 615                                            p_data );
 616                             p_data++;
 617                             i_chunk_size--;
 618                         }
 619
 620                         i_x += 4;
 621                         if( i_x >= i_strip_x2 - i_strip_x1 )
 622                         {
 623                             i_x = 0;
 624                             i_y += 4;
 625                         }
 626                         i_vector_flags <<= 1;
 627                     }
 628                 }
 629                 break;
 630
 631             case( 0x3100 ): /* load image Inter */
 632                 while( ( i_chunk_size > 4 )&&( i_y < i_strip_y2 - i_strip_y1) )
 633                 {
 634                     uint32_t i_mask;
 635                     i_vector_flags = GET4BYTES( p_data );
 636                     i_chunk_size -= 4;
 637                     i_mask = 0x80000000UL;
 638
 639                     while( (i_chunk_size > 0 ) && ( i_mask )
 640                            && ( i_y < i_strip_y2 - i_strip_y1 ) )
 641                     {
 642                         if( i_vector_flags&i_mask )
 643                         {
 644                             i_mask >>= 1;
 645                             if( !i_mask )
 646                             {
 647                                 if( i_chunk_size < 4 )
 648                                 {
 649                                     break;
 650                                 }
 651                                 i_vector_flags = GET4BYTES( p_data );
 652                                 i_chunk_size -= 4;
 653                                 i_mask = 0x80000000UL;
 654                             }
 655                             if( i_vector_flags&i_mask )
 656                             {
 657                                 if( i_chunk_size < 4 ) break;
 658                                 cinepak_Getv4( p_context,
 659                                                i_strip,
 660                                                i_strip_x1 + i_x,
 661                                                i_strip_y1 + i_y,
 662                                                i_strip_x2, i_strip_y2,
 663                                                p_data );
 664                                 p_data += 4;
 665                                 i_chunk_size -= 4;
 666                             }
 667                             else
 668                             {
 669                                 if( i_chunk_size < 1 ) break;
 670                                 cinepak_Getv1( p_context,
 671                                                i_strip,
 672                                                i_strip_x1 + i_x,
 673                                                i_strip_y1 + i_y,
 674                                                i_strip_x2, i_strip_y2,
 675                                                p_data );
 676                                 p_data++;
 677                                 i_chunk_size--;
 678                             }
 679                         }
 680                         i_mask >>= 1;
 681
 682                         i_x += 4;
 683                         if( i_x >= i_strip_x2 - i_strip_x1 )
 684                         {
 685                             i_x = 0;
 686                             i_y += 4;
 687                         }
 688                     }
 689                 }
 690                 break;
 691
 692             case( 0x3200 ): /* load intra picture but all v1*/
 693                 while( ( i_chunk_size > 0 ) &&
 694                        ( i_y < i_strip_y2 - i_strip_y1 ) )
 695                 {
 696                     cinepak_Getv1( p_context,
 697                                    i_strip,
 698                                    i_strip_x1 + i_x,
 699                                    i_strip_y1 + i_y,
 700                                    i_strip_x2, i_strip_y2,
 701                                    p_data );
 702                     p_data++;
 703                     i_chunk_size--;
 704
 705                     i_x += 4;
 706                     if( i_x >= i_strip_x2 - i_strip_x1 )
 707                     {
 708                         i_x = 0;
 709                         i_y += 4;
 710                     }
 711                 }
 712                 break;
 713
 714             default:
 715                 break;
 716
 717             }
 718             p_data += i_chunk_size ; /* skip remains bytes */
 719         }
 720     }
 721
 722     return( 0 );
 723 }