libavcodec/indeo5.c

   1 /*
   2  * Indeo Video Interactive v5 compatible decoder
   3  * Copyright (c) 2009 Maxim Poliakovski
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Indeo Video Interactive version 5 decoder
  25  *
  26  * Indeo5 data is usually transported within .avi or .mov files.
  27  * Known FOURCCs: 'IV50'
  28  */
  29
  30 #define BITSTREAM_READER_LE
  31 #include "avcodec.h"
  32 #include "get_bits.h"
  33 #include "dsputil.h"
  34 #include "ivi_dsp.h"
  35 #include "ivi_common.h"
  36 #include "indeo5data.h"
  37
  38 /**
  39  *  Indeo5 frame types.
  40  */
  41 enum {
  42     FRAMETYPE_INTRA       = 0,
  43     FRAMETYPE_INTER       = 1,  ///< non-droppable P-frame
  44     FRAMETYPE_INTER_SCAL  = 2,  ///< droppable P-frame used in the scalability mode
  45     FRAMETYPE_INTER_NOREF = 3,  ///< droppable P-frame
  46     FRAMETYPE_NULL        = 4   ///< empty frame with no data
  47 };
  48
  49 #define IVI5_PIC_SIZE_ESC       15
  50
  51 /**
  52  *  Decode Indeo5 GOP (Group of pictures) header.
  53  *  This header is present in key frames only.
  54  *  It defines parameters for all frames in a GOP.
  55  *
  56  *  @param[in,out] ctx    ptr to the decoder context
  57  *  @param[in]     avctx  ptr to the AVCodecContext
  58  *  @return         result code: 0 = OK, -1 = error
  59  */
  60 static int decode_gop_header(IVI45DecContext *ctx, AVCodecContext *avctx)
  61 {
  62     int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size;
  63     int             quant_mat, blk_size_changed = 0;
  64     IVIBandDesc     *band, *band1, *band2;
  65     IVIPicConfig    pic_conf;
  66
  67     ctx->gop_flags = get_bits(&ctx->gb, 8);
  68
  69     ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
  70
  71     if (ctx->gop_flags & IVI5_IS_PROTECTED)
  72         ctx->lock_word = get_bits_long(&ctx->gb, 32);
  73
  74     tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
  75     if (tile_size > 256) {
  76         av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
  77         return -1;
  78     }
  79
  80     /* decode number of wavelet bands */
  81     /* num_levels * 3 + 1 */
  82     pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;
  83     pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;
  84     ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
  85     if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
  86         av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
  87                pic_conf.luma_bands, pic_conf.chroma_bands);
  88         return -1;
  89     }
  90
  91     pic_size_indx = get_bits(&ctx->gb, 4);
  92     if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
  93         pic_conf.pic_height = get_bits(&ctx->gb, 13);
  94         pic_conf.pic_width  = get_bits(&ctx->gb, 13);
  95     } else {
  96         pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
  97         pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;
  98     }
  99
 100     if (ctx->gop_flags & 2) {
 101         av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
 102         return -1;
 103     }
 104
 105     pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
 106     pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
 107
 108     if (!tile_size) {
 109         pic_conf.tile_height = pic_conf.pic_height;
 110         pic_conf.tile_width  = pic_conf.pic_width;
 111     } else {
 112         pic_conf.tile_height = pic_conf.tile_width = tile_size;
 113     }
 114
 115     /* check if picture layout was changed and reallocate buffers */
 116     if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
 117         result = ff_ivi_init_planes(ctx->planes, &pic_conf);
 118         if (result) {
 119             av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
 120             return -1;
 121         }
 122         ctx->pic_conf = pic_conf;
 123         blk_size_changed = 1; /* force reallocation of the internal structures */
 124     }
 125
 126     for (p = 0; p <= 1; p++) {
 127         for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
 128             band = &ctx->planes[p].bands[i];
 129
 130             band->is_halfpel = get_bits1(&ctx->gb);
 131
 132             mb_size  = get_bits1(&ctx->gb);
 133             blk_size = 8 >> get_bits1(&ctx->gb);
 134             mb_size  = blk_size << !mb_size;
 135
 136             blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
 137             if (blk_size_changed) {
 138                 band->mb_size  = mb_size;
 139                 band->blk_size = blk_size;
 140             }
 141
 142             if (get_bits1(&ctx->gb)) {
 143                 av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
 144                 return -1;
 145             }
 146
 147             /* select transform function and scan pattern according to plane and band number */
 148             switch ((p << 2) + i) {
 149             case 0:
 150                 band->inv_transform = ff_ivi_inverse_slant_8x8;
 151                 band->dc_transform  = ff_ivi_dc_slant_2d;
 152                 band->scan          = ff_zigzag_direct;
 153                 break;
 154
 155             case 1:
 156                 band->inv_transform = ff_ivi_row_slant8;
 157                 band->dc_transform  = ff_ivi_dc_row_slant;
 158                 band->scan          = ff_ivi_vertical_scan_8x8;
 159                 break;
 160
 161             case 2:
 162                 band->inv_transform = ff_ivi_col_slant8;
 163                 band->dc_transform  = ff_ivi_dc_col_slant;
 164                 band->scan          = ff_ivi_horizontal_scan_8x8;
 165                 break;
 166
 167             case 3:
 168                 band->inv_transform = ff_ivi_put_pixels_8x8;
 169                 band->dc_transform  = ff_ivi_put_dc_pixel_8x8;
 170                 band->scan          = ff_ivi_horizontal_scan_8x8;
 171                 break;
 172
 173             case 4:
 174                 band->inv_transform = ff_ivi_inverse_slant_4x4;
 175                 band->dc_transform  = ff_ivi_dc_slant_2d;
 176                 band->scan          = ff_ivi_direct_scan_4x4;
 177                 break;
 178             }
 179
 180             band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
 181                                 band->inv_transform == ff_ivi_inverse_slant_4x4;
 182
 183             /* select dequant matrix according to plane and band number */
 184             if (!p) {
 185                 quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
 186             } else {
 187                 quant_mat = 5;
 188             }
 189
 190             if (band->blk_size == 8) {
 191                 band->intra_base  = &ivi5_base_quant_8x8_intra[quant_mat][0];
 192                 band->inter_base  = &ivi5_base_quant_8x8_inter[quant_mat][0];
 193                 band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0];
 194                 band->inter_scale = &ivi5_scale_quant_8x8_inter[quant_mat][0];
 195             } else {
 196                 band->intra_base  = ivi5_base_quant_4x4_intra;
 197                 band->inter_base  = ivi5_base_quant_4x4_inter;
 198                 band->intra_scale = ivi5_scale_quant_4x4_intra;
 199                 band->inter_scale = ivi5_scale_quant_4x4_inter;
 200             }
 201
 202             if (get_bits(&ctx->gb, 2)) {
 203                 av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
 204                 return -1;
 205             }
 206         }
 207     }
 208
 209     /* copy chroma parameters into the 2nd chroma plane */
 210     for (i = 0; i < pic_conf.chroma_bands; i++) {
 211         band1 = &ctx->planes[1].bands[i];
 212         band2 = &ctx->planes[2].bands[i];
 213
 214         band2->width         = band1->width;
 215         band2->height        = band1->height;
 216         band2->mb_size       = band1->mb_size;
 217         band2->blk_size      = band1->blk_size;
 218         band2->is_halfpel    = band1->is_halfpel;
 219         band2->intra_base    = band1->intra_base;
 220         band2->inter_base    = band1->inter_base;
 221         band2->intra_scale   = band1->intra_scale;
 222         band2->inter_scale   = band1->inter_scale;
 223         band2->scan          = band1->scan;
 224         band2->inv_transform = band1->inv_transform;
 225         band2->dc_transform  = band1->dc_transform;
 226         band2->is_2d_trans   = band1->is_2d_trans;
 227     }
 228
 229     /* reallocate internal structures if needed */
 230     if (blk_size_changed) {
 231         result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
 232                                    pic_conf.tile_height);
 233         if (result) {
 234             av_log(avctx, AV_LOG_ERROR,
 235                    "Couldn't reallocate internal structures!\n");
 236             return -1;
 237         }
 238     }
 239
 240     if (ctx->gop_flags & 8) {
 241         if (get_bits(&ctx->gb, 3)) {
 242             av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
 243             return -1;
 244         }
 245
 246         if (get_bits1(&ctx->gb))
 247             skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
 248     }
 249
 250     align_get_bits(&ctx->gb);
 251
 252     skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
 253
 254     /* skip GOP extension if any */
 255     if (get_bits1(&ctx->gb)) {
 256         do {
 257             i = get_bits(&ctx->gb, 16);
 258         } while (i & 0x8000);
 259     }
 260
 261     align_get_bits(&ctx->gb);
 262
 263     return 0;
 264 }
 265
 266
 267 /**
 268  *  Skip a header extension.
 269  *
 270  *  @param[in,out]  gb  the GetBit context
 271  */
 272 static inline void skip_hdr_extension(GetBitContext *gb)
 273 {
 274     int i, len;
 275
 276     do {
 277         len = get_bits(gb, 8);
 278         for (i = 0; i < len; i++) skip_bits(gb, 8);
 279     } while(len);
 280 }
 281
 282
 283 /**
 284  *  Decode Indeo5 picture header.
 285  *
 286  *  @param[in,out]  ctx    ptr to the decoder context
 287  *  @param[in]      avctx  ptr to the AVCodecContext
 288  *  @return         result code: 0 = OK, -1 = error
 289  */
 290 static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
 291 {
 292     if (get_bits(&ctx->gb, 5) != 0x1F) {
 293         av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
 294         return -1;
 295     }
 296
 297     ctx->prev_frame_type = ctx->frame_type;
 298     ctx->frame_type      = get_bits(&ctx->gb, 3);
 299     if (ctx->frame_type >= 5) {
 300         av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
 301         return -1;
 302     }
 303
 304     ctx->frame_num = get_bits(&ctx->gb, 8);
 305
 306     if (ctx->frame_type == FRAMETYPE_INTRA) {
 307         ctx->gop_invalid = 1;
 308         if (decode_gop_header(ctx, avctx)) {
 309             av_log(avctx, AV_LOG_ERROR, "Invalid GOP header, skipping frames.\n");
 310             return AVERROR_INVALIDDATA;
 311         }
 312         ctx->gop_invalid = 0;
 313     }
 314
 315     if (ctx->frame_type != FRAMETYPE_NULL) {
 316         ctx->frame_flags = get_bits(&ctx->gb, 8);
 317
 318         ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
 319
 320         ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
 321
 322         /* skip unknown extension if any */
 323         if (ctx->frame_flags & 0x20)
 324             skip_hdr_extension(&ctx->gb); /* XXX: untested */
 325
 326         /* decode macroblock huffman codebook */
 327         if (ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40, IVI_MB_HUFF, &ctx->mb_vlc, avctx))
 328             return -1;
 329
 330         skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
 331     }
 332
 333     align_get_bits(&ctx->gb);
 334
 335     return 0;
 336 }
 337
 338
 339 /**
 340  *  Decode Indeo5 band header.
 341  *
 342  *  @param[in,out]  ctx    ptr to the decoder context
 343  *  @param[in,out]  band   ptr to the band descriptor
 344  *  @param[in]      avctx  ptr to the AVCodecContext
 345  *  @return         result code: 0 = OK, -1 = error
 346  */
 347 static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
 348                            AVCodecContext *avctx)
 349 {
 350     int         i;
 351     uint8_t     band_flags;
 352
 353     band_flags = get_bits(&ctx->gb, 8);
 354
 355     if (band_flags & 1) {
 356         band->is_empty = 1;
 357         return 0;
 358     }
 359
 360     band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
 361
 362     band->inherit_mv     = band_flags & 2;
 363     band->inherit_qdelta = band_flags & 8;
 364     band->qdelta_present = band_flags & 4;
 365     if (!band->qdelta_present) band->inherit_qdelta = 1;
 366
 367     /* decode rvmap probability corrections if any */
 368     band->num_corr = 0; /* there are no corrections */
 369     if (band_flags & 0x10) {
 370         band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
 371         if (band->num_corr > 61) {
 372             av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
 373                    band->num_corr);
 374             return -1;
 375         }
 376
 377         /* read correction pairs */
 378         for (i = 0; i < band->num_corr * 2; i++)
 379             band->corr[i] = get_bits(&ctx->gb, 8);
 380     }
 381
 382     /* select appropriate rvmap table for this band */
 383     band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
 384
 385     /* decode block huffman codebook */
 386     if (ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF, &band->blk_vlc, avctx))
 387         return -1;
 388
 389     band->checksum_present = get_bits1(&ctx->gb);
 390     if (band->checksum_present)
 391         band->checksum = get_bits(&ctx->gb, 16);
 392
 393     band->glob_quant = get_bits(&ctx->gb, 5);
 394
 395     /* skip unknown extension if any */
 396     if (band_flags & 0x20) { /* XXX: untested */
 397         align_get_bits(&ctx->gb);
 398         skip_hdr_extension(&ctx->gb);
 399     }
 400
 401     align_get_bits(&ctx->gb);
 402
 403     return 0;
 404 }
 405
 406
 407 /**
 408  *  Decode info (block type, cbp, quant delta, motion vector)
 409  *  for all macroblocks in the current tile.
 410  *
 411  *  @param[in,out]  ctx    ptr to the decoder context
 412  *  @param[in,out]  band   ptr to the band descriptor
 413  *  @param[in,out]  tile   ptr to the tile descriptor
 414  *  @param[in]      avctx  ptr to the AVCodecContext
 415  *  @return         result code: 0 = OK, -1 = error
 416  */
 417 static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
 418                           IVITile *tile, AVCodecContext *avctx)
 419 {
 420     int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
 421                 mv_scale, blks_per_mb;
 422     IVIMbInfo   *mb, *ref_mb;
 423     int         row_offset = band->mb_size * band->pitch;
 424
 425     mb     = tile->mbs;
 426     ref_mb = tile->ref_mbs;
 427     offs   = tile->ypos * band->pitch + tile->xpos;
 428
 429     if (!ref_mb &&
 430         ((band->qdelta_present && band->inherit_qdelta) || band->inherit_mv))
 431         return AVERROR_INVALIDDATA;
 432
 433     if (tile->num_MBs != IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size)) {
 434         av_log(avctx, AV_LOG_ERROR, "Allocated tile size %d mismatches parameters %d\n",
 435                tile->num_MBs, IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size));
 436         return AVERROR_INVALIDDATA;
 437     }
 438
 439     /* scale factor for motion vectors */
 440     mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
 441     mv_x = mv_y = 0;
 442
 443     for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
 444         mb_offset = offs;
 445
 446         for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
 447             mb->xpos     = x;
 448             mb->ypos     = y;
 449             mb->buf_offs = mb_offset;
 450
 451             if (get_bits1(&ctx->gb)) {
 452                 if (ctx->frame_type == FRAMETYPE_INTRA) {
 453                     av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
 454                     return -1;
 455                 }
 456                 mb->type = 1; /* empty macroblocks are always INTER */
 457                 mb->cbp  = 0; /* all blocks are empty */
 458
 459                 mb->q_delta = 0;
 460                 if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
 461                     mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
 462                                            IVI_VLC_BITS, 1);
 463                     mb->q_delta = IVI_TOSIGNED(mb->q_delta);
 464                 }
 465
 466                 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
 467                 if (band->inherit_mv){
 468                     /* motion vector inheritance */
 469                     if (mv_scale) {
 470                         mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
 471                         mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
 472                     } else {
 473                         mb->mv_x = ref_mb->mv_x;
 474                         mb->mv_y = ref_mb->mv_y;
 475                     }
 476                 }
 477             } else {
 478                 if (band->inherit_mv) {
 479                     mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
 480                 } else if (ctx->frame_type == FRAMETYPE_INTRA) {
 481                     mb->type = 0; /* mb_type is always INTRA for intra-frames */
 482                 } else {
 483                     mb->type = get_bits1(&ctx->gb);
 484                 }
 485
 486                 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
 487                 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
 488
 489                 mb->q_delta = 0;
 490                 if (band->qdelta_present) {
 491                     if (band->inherit_qdelta) {
 492                         if (ref_mb) mb->q_delta = ref_mb->q_delta;
 493                     } else if (mb->cbp || (!band->plane && !band->band_num &&
 494                                            (ctx->frame_flags & 8))) {
 495                         mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
 496                                                IVI_VLC_BITS, 1);
 497                         mb->q_delta = IVI_TOSIGNED(mb->q_delta);
 498                     }
 499                 }
 500
 501                 if (!mb->type) {
 502                     mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
 503                 } else {
 504                     if (band->inherit_mv){
 505                         /* motion vector inheritance */
 506                         if (mv_scale) {
 507                             mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
 508                             mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
 509                         } else {
 510                             mb->mv_x = ref_mb->mv_x;
 511                             mb->mv_y = ref_mb->mv_y;
 512                         }
 513                     } else {
 514                         /* decode motion vector deltas */
 515                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
 516                                             IVI_VLC_BITS, 1);
 517                         mv_y += IVI_TOSIGNED(mv_delta);
 518                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
 519                                             IVI_VLC_BITS, 1);
 520                         mv_x += IVI_TOSIGNED(mv_delta);
 521                         mb->mv_x = mv_x;
 522                         mb->mv_y = mv_y;
 523                     }
 524                 }
 525             }
 526
 527             mb++;
 528             if (ref_mb)
 529                 ref_mb++;
 530             mb_offset += band->mb_size;
 531         }
 532
 533         offs += row_offset;
 534     }
 535
 536     align_get_bits(&ctx->gb);
 537
 538     return 0;
 539 }
 540
 541
 542 /**
 543  *  Switch buffers.
 544  *
 545  *  @param[in,out] ctx  ptr to the decoder context
 546  */
 547 static void switch_buffers(IVI45DecContext *ctx)
 548 {
 549     switch (ctx->prev_frame_type) {
 550     case FRAMETYPE_INTRA:
 551     case FRAMETYPE_INTER:
 552         ctx->buf_switch ^= 1;
 553         ctx->dst_buf = ctx->buf_switch;
 554         ctx->ref_buf = ctx->buf_switch ^ 1;
 555         break;
 556     case FRAMETYPE_INTER_SCAL:
 557         if (!ctx->inter_scal) {
 558             ctx->ref2_buf   = 2;
 559             ctx->inter_scal = 1;
 560         }
 561         FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);
 562         ctx->ref_buf = ctx->ref2_buf;
 563         break;
 564     case FRAMETYPE_INTER_NOREF:
 565         break;
 566     }
 567
 568     switch (ctx->frame_type) {
 569     case FRAMETYPE_INTRA:
 570         ctx->buf_switch = 0;
 571         /* FALLTHROUGH */
 572     case FRAMETYPE_INTER:
 573         ctx->inter_scal = 0;
 574         ctx->dst_buf = ctx->buf_switch;
 575         ctx->ref_buf = ctx->buf_switch ^ 1;
 576         break;
 577     case FRAMETYPE_INTER_SCAL:
 578     case FRAMETYPE_INTER_NOREF:
 579     case FRAMETYPE_NULL:
 580         break;
 581     }
 582 }
 583
 584
 585 static int is_nonnull_frame(IVI45DecContext *ctx)
 586 {
 587     return ctx->frame_type != FRAMETYPE_NULL;
 588 }
 589
 590
 591 /**
 592  *  Initialize Indeo5 decoder.
 593  */
 594 static av_cold int decode_init(AVCodecContext *avctx)
 595 {
 596     IVI45DecContext  *ctx = avctx->priv_data;
 597     int             result;
 598
 599     ff_ivi_init_static_vlc();
 600
 601     /* copy rvmap tables in our context so we can apply changes to them */
 602     memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
 603
 604     /* set the initial picture layout according to the basic profile:
 605        there is only one band per plane (no scalability), only one tile (no local decoding)
 606        and picture format = YVU9 */
 607     ctx->pic_conf.pic_width     = avctx->width;
 608     ctx->pic_conf.pic_height    = avctx->height;
 609     ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
 610     ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
 611     ctx->pic_conf.tile_width    = avctx->width;
 612     ctx->pic_conf.tile_height   = avctx->height;
 613     ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
 614
 615     result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
 616     if (result) {
 617         av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
 618         return -1;
 619     }
 620
 621     ctx->buf_switch = 0;
 622     ctx->inter_scal = 0;
 623
 624     ctx->decode_pic_hdr   = decode_pic_hdr;
 625     ctx->decode_band_hdr  = decode_band_hdr;
 626     ctx->decode_mb_info   = decode_mb_info;
 627     ctx->switch_buffers   = switch_buffers;
 628     ctx->is_nonnull_frame = is_nonnull_frame;
 629
 630     avctx->pix_fmt = AV_PIX_FMT_YUV410P;
 631
 632     return 0;
 633 }
 634
 635
 636 AVCodec ff_indeo5_decoder = {
 637     .name           = "indeo5",
 638     .type           = AVMEDIA_TYPE_VIDEO,
 639     .id             = AV_CODEC_ID_INDEO5,
 640     .priv_data_size = sizeof(IVI45DecContext),
 641     .init           = decode_init,
 642     .close          = ff_ivi_decode_close,
 643     .decode         = ff_ivi_decode_frame,
 644     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
 645     .capabilities   = CODEC_CAP_DR1,
 646 };