libavcodec/indeo4.c

   1 /*
   2  * Indeo Video Interactive v4 compatible decoder
   3  * Copyright (c) 2009-2011 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 4 decoder
  25  *
  26  * Indeo 4 data is usually transported within .avi or .mov files.
  27  * Known FOURCCs: 'IV41'
  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 "indeo4data.h"
  37
  38 #define IVI4_STREAM_ANALYSER    0
  39 #define IVI4_DEBUG_CHECKSUM     0
  40
  41 /**
  42  *  Indeo 4 frame types.
  43  */
  44 enum {
  45     FRAMETYPE_INTRA       = 0,
  46     FRAMETYPE_BIDIR1      = 1,  ///< bidirectional frame
  47     FRAMETYPE_INTER       = 2,  ///< non-droppable P-frame
  48     FRAMETYPE_BIDIR       = 3,  ///< bidirectional frame
  49     FRAMETYPE_INTER_NOREF = 4,  ///< droppable P-frame
  50     FRAMETYPE_NULL_FIRST  = 5,  ///< empty frame with no data
  51     FRAMETYPE_NULL_LAST   = 6   ///< empty frame with no data
  52 };
  53
  54 #define IVI4_PIC_SIZE_ESC   7
  55
  56
  57 typedef struct {
  58     GetBitContext   gb;
  59     AVFrame         frame;
  60     RVMapDesc       rvmap_tabs[9];   ///< local corrected copy of the static rvmap tables
  61
  62     uint32_t        frame_num;
  63     int             frame_type;
  64     int             prev_frame_type; ///< frame type of the previous frame
  65     uint32_t        data_size;       ///< size of the frame data in bytes from picture header
  66     int             is_scalable;
  67     int             transp_status;   ///< transparency mode status: 1 - enabled
  68
  69     IVIPicConfig    pic_conf;
  70     IVIPlaneDesc    planes[3];       ///< color planes
  71
  72     int             buf_switch;      ///< used to switch between three buffers
  73     int             dst_buf;         ///< buffer index for the currently decoded frame
  74     int             ref_buf;         ///< inter frame reference buffer index
  75
  76     IVIHuffTab      mb_vlc;          ///< current macroblock table descriptor
  77     IVIHuffTab      blk_vlc;         ///< current block table descriptor
  78
  79     uint16_t        checksum;        ///< frame checksum
  80
  81     uint8_t         rvmap_sel;
  82     uint8_t         in_imf;
  83     uint8_t         in_q;            ///< flag for explicitly stored quantiser delta
  84     uint8_t         pic_glob_quant;
  85     uint8_t         unknown1;
  86
  87 #if IVI4_STREAM_ANALYSER
  88     uint8_t         has_b_frames;
  89     uint8_t         has_transp;
  90     uint8_t         uses_tiling;
  91     uint8_t         uses_haar;
  92     uint8_t         uses_fullpel;
  93 #endif
  94 } IVI4DecContext;
  95
  96
  97 struct {
  98     InvTransformPtr *inv_trans;
  99     DCTransformPtr  *dc_trans;
 100     int             is_2d_trans;
 101 } transforms[18] = {
 102     { ff_ivi_inverse_haar_8x8,  ff_ivi_dc_haar_2d,       1 },
 103     { NULL, NULL, 0 }, /* inverse Haar 8x1 */
 104     { NULL, NULL, 0 }, /* inverse Haar 1x8 */
 105     { ff_ivi_put_pixels_8x8,    ff_ivi_put_dc_pixel_8x8, 1 },
 106     { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d,      1 },
 107     { ff_ivi_row_slant8,        ff_ivi_dc_row_slant,     1 },
 108     { ff_ivi_col_slant8,        ff_ivi_dc_col_slant,     1 },
 109     { NULL, NULL, 0 }, /* inverse DCT 8x8 */
 110     { NULL, NULL, 0 }, /* inverse DCT 8x1 */
 111     { NULL, NULL, 0 }, /* inverse DCT 1x8 */
 112     { NULL, NULL, 0 }, /* inverse Haar 4x4 */
 113     { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d,      1 },
 114     { NULL, NULL, 0 }, /* no transform 4x4 */
 115     { NULL, NULL, 0 }, /* inverse Haar 1x4 */
 116     { NULL, NULL, 0 }, /* inverse Haar 4x1 */
 117     { NULL, NULL, 0 }, /* inverse slant 1x4 */
 118     { NULL, NULL, 0 }, /* inverse slant 4x1 */
 119     { NULL, NULL, 0 }, /* inverse DCT 4x4 */
 120 };
 121
 122 /**
 123  *  Decode subdivision of a plane.
 124  *  This is a simplified version that checks for two supported subdivisions:
 125  *  - 1 wavelet band  per plane, size factor 1:1, code pattern: 3
 126  *  - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3
 127  *  Anything else is either unsupported or corrupt.
 128  *
 129  *  @param[in,out] gb    the GetBit context
 130  *  @return        number of wavelet bands or 0 on error
 131  */
 132 static int decode_plane_subdivision(GetBitContext *gb)
 133 {
 134     int i;
 135
 136     switch (get_bits(gb, 2)) {
 137     case 3:
 138         return 1;
 139     case 2:
 140         for (i = 0; i < 4; i++)
 141             if (get_bits(gb, 2) != 3)
 142                 return 0;
 143         return 4;
 144     default:
 145         return 0;
 146     }
 147 }
 148
 149 static inline int scale_tile_size(int def_size, int size_factor)
 150 {
 151     return (size_factor == 15 ? def_size : (size_factor + 1) << 5);
 152 }
 153
 154 /**
 155  *  Decode Indeo 4 picture header.
 156  *
 157  *  @param[in,out] ctx       pointer to the decoder context
 158  *  @param[in]     avctx     pointer to the AVCodecContext
 159  *  @return        result code: 0 = OK, negative number = error
 160  */
 161 static int decode_pic_hdr(IVI4DecContext *ctx, AVCodecContext *avctx)
 162 {
 163     int             pic_size_indx, val, i, p;
 164     IVIPicConfig    pic_conf;
 165
 166     if (get_bits(&ctx->gb, 18) != 0x3FFF8) {
 167         av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
 168         return AVERROR_INVALIDDATA;
 169     }
 170
 171     ctx->prev_frame_type = ctx->frame_type;
 172     ctx->frame_type      = get_bits(&ctx->gb, 3);
 173     if (ctx->frame_type == 7) {
 174         av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);
 175         return AVERROR_INVALIDDATA;
 176     }
 177
 178 #if IVI4_STREAM_ANALYSER
 179     if (   ctx->frame_type == FRAMETYPE_BIDIR1
 180         || ctx->frame_type == FRAMETYPE_BIDIR)
 181         ctx->has_b_frames = 1;
 182 #endif
 183
 184     ctx->transp_status = get_bits1(&ctx->gb);
 185 #if IVI4_STREAM_ANALYSER
 186     if (ctx->transp_status) {
 187         ctx->has_transp = 1;
 188     }
 189 #endif
 190
 191     /* unknown bit: Mac decoder ignores this bit, XANIM returns error */
 192     if (get_bits1(&ctx->gb)) {
 193         av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");
 194         return AVERROR_INVALIDDATA;
 195     }
 196
 197     ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;
 198
 199     /* null frames don't contain anything else so we just return */
 200     if (ctx->frame_type >= FRAMETYPE_NULL_FIRST) {
 201         av_dlog(avctx, "Null frame encountered!\n");
 202         return 0;
 203     }
 204
 205     /* Check key lock status. If enabled - ignore lock word.         */
 206     /* Usually we have to prompt the user for the password, but      */
 207     /* we don't do that because Indeo 4 videos can be decoded anyway */
 208     if (get_bits1(&ctx->gb)) {
 209         skip_bits_long(&ctx->gb, 32);
 210         av_dlog(avctx, "Password-protected clip!\n");
 211     }
 212
 213     pic_size_indx = get_bits(&ctx->gb, 3);
 214     if (pic_size_indx == IVI4_PIC_SIZE_ESC) {
 215         pic_conf.pic_height = get_bits(&ctx->gb, 16);
 216         pic_conf.pic_width  = get_bits(&ctx->gb, 16);
 217     } else {
 218         pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];
 219         pic_conf.pic_width  = ivi4_common_pic_sizes[pic_size_indx * 2    ];
 220     }
 221
 222     /* Decode tile dimensions. */
 223     if (get_bits1(&ctx->gb)) {
 224         pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));
 225         pic_conf.tile_width  = scale_tile_size(pic_conf.pic_width,  get_bits(&ctx->gb, 4));
 226 #if IVI4_STREAM_ANALYSER
 227         ctx->uses_tiling = 1;
 228 #endif
 229     } else {
 230         pic_conf.tile_height = pic_conf.pic_height;
 231         pic_conf.tile_width  = pic_conf.pic_width;
 232     }
 233
 234     /* Decode chroma subsampling. We support only 4:4 aka YVU9. */
 235     if (get_bits(&ctx->gb, 2)) {
 236         av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");
 237         return AVERROR_INVALIDDATA;
 238     }
 239     pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
 240     pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
 241
 242     /* decode subdivision of the planes */
 243     pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);
 244     if (pic_conf.luma_bands)
 245         pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);
 246     ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
 247     if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
 248         av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
 249                pic_conf.luma_bands, pic_conf.chroma_bands);
 250         return AVERROR_INVALIDDATA;
 251     }
 252
 253     /* check if picture layout was changed and reallocate buffers */
 254     if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
 255         if (ff_ivi_init_planes(ctx->planes, &pic_conf)) {
 256             av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
 257             return AVERROR(ENOMEM);
 258         }
 259
 260         ctx->pic_conf = pic_conf;
 261
 262         /* set default macroblock/block dimensions */
 263         for (p = 0; p <= 2; p++) {
 264             for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
 265                 ctx->planes[p].bands[i].mb_size  = !p ? (!ctx->is_scalable ? 16 : 8) : 4;
 266                 ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;
 267             }
 268         }
 269
 270         if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width,
 271                               ctx->pic_conf.tile_height)) {
 272             av_log(avctx, AV_LOG_ERROR,
 273                    "Couldn't reallocate internal structures!\n");
 274             return AVERROR(ENOMEM);
 275         }
 276     }
 277
 278     ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;
 279
 280     /* skip decTimeEst field if present */
 281     if (get_bits1(&ctx->gb))
 282         skip_bits(&ctx->gb, 8);
 283
 284     /* decode macroblock and block huffman codebooks */
 285     if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF,  &ctx->mb_vlc,  avctx) ||
 286         ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))
 287         return AVERROR_INVALIDDATA;
 288
 289     ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
 290
 291     ctx->in_imf = get_bits1(&ctx->gb);
 292     ctx->in_q   = get_bits1(&ctx->gb);
 293
 294     ctx->pic_glob_quant = get_bits(&ctx->gb, 5);
 295
 296     /* TODO: ignore this parameter if unused */
 297     ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;
 298
 299     ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;
 300
 301     /* skip picture header extension if any */
 302     while (get_bits1(&ctx->gb)) {
 303         av_dlog(avctx, "Pic hdr extension encountered!\n");
 304         val = get_bits(&ctx->gb, 8);
 305     }
 306
 307     if (get_bits1(&ctx->gb)) {
 308         av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");
 309     }
 310
 311     align_get_bits(&ctx->gb);
 312
 313     return 0;
 314 }
 315
 316
 317 /**
 318  *  Decode Indeo 4 band header.
 319  *
 320  *  @param[in,out] ctx       pointer to the decoder context
 321  *  @param[in,out] band      pointer to the band descriptor
 322  *  @param[in]     avctx     pointer to the AVCodecContext
 323  *  @return        result code: 0 = OK, negative number = error
 324  */
 325 static int decode_band_hdr(IVI4DecContext *ctx, IVIBandDesc *band,
 326                            AVCodecContext *avctx)
 327 {
 328     int plane, band_num, hdr_size, indx, transform_id, scan_indx;
 329     int i;
 330
 331     plane    = get_bits(&ctx->gb, 2);
 332     band_num = get_bits(&ctx->gb, 4);
 333     if (band->plane != plane || band->band_num != band_num) {
 334         av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");
 335         return AVERROR_INVALIDDATA;
 336     }
 337
 338     band->is_empty = get_bits1(&ctx->gb);
 339     if (!band->is_empty) {
 340         hdr_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 4;
 341
 342         band->is_halfpel = get_bits(&ctx->gb, 2);
 343         if (band->is_halfpel >= 2) {
 344             av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",
 345                    band->is_halfpel);
 346             return AVERROR_INVALIDDATA;
 347         }
 348 #if IVI4_STREAM_ANALYSER
 349         if (!band->is_halfpel)
 350             ctx->uses_fullpel = 1;
 351 #endif
 352
 353         band->checksum_present = get_bits1(&ctx->gb);
 354         if (band->checksum_present)
 355             band->checksum = get_bits(&ctx->gb, 16);
 356
 357         indx = get_bits(&ctx->gb, 2);
 358         if (indx == 3) {
 359             av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");
 360             return AVERROR_INVALIDDATA;
 361         }
 362         band->mb_size  = 16 >> indx;
 363         band->blk_size = 8 >> (indx >> 1);
 364
 365         band->inherit_mv     = get_bits1(&ctx->gb);
 366         band->inherit_qdelta = get_bits1(&ctx->gb);
 367
 368         band->glob_quant = get_bits(&ctx->gb, 5);
 369
 370         if (!get_bits1(&ctx->gb) || ctx->frame_type == FRAMETYPE_INTRA) {
 371             transform_id = get_bits(&ctx->gb, 5);
 372             if (!transforms[transform_id].inv_trans) {
 373                 av_log_ask_for_sample(avctx, "Unimplemented transform: %d!\n", transform_id);
 374                 return AVERROR_PATCHWELCOME;
 375             }
 376             if ((transform_id >= 7 && transform_id <= 9) ||
 377                  transform_id == 17) {
 378                 av_log_ask_for_sample(avctx, "DCT transform not supported yet!\n");
 379                 return AVERROR_PATCHWELCOME;
 380             }
 381
 382 #if IVI4_STREAM_ANALYSER
 383             if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)
 384                 ctx->uses_haar = 1;
 385 #endif
 386
 387             band->inv_transform = transforms[transform_id].inv_trans;
 388             band->dc_transform  = transforms[transform_id].dc_trans;
 389             band->is_2d_trans   = transforms[transform_id].is_2d_trans;
 390
 391             scan_indx = get_bits(&ctx->gb, 4);
 392             if (scan_indx == 15) {
 393                 av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
 394                 return AVERROR_INVALIDDATA;
 395             }
 396             band->scan = scan_index_to_tab[scan_indx];
 397
 398             band->quant_mat = get_bits(&ctx->gb, 5);
 399             if (band->quant_mat == 31) {
 400                 av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");
 401                 return AVERROR_INVALIDDATA;
 402             }
 403         }
 404
 405         /* decode block huffman codebook */
 406         if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF,
 407                                  &band->blk_vlc, avctx))
 408             return AVERROR_INVALIDDATA;
 409
 410         /* select appropriate rvmap table for this band */
 411         band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
 412
 413         /* decode rvmap probability corrections if any */
 414         band->num_corr = 0; /* there is no corrections */
 415         if (get_bits1(&ctx->gb)) {
 416             band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
 417             if (band->num_corr > 61) {
 418                 av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
 419                        band->num_corr);
 420                 return AVERROR_INVALIDDATA;
 421             }
 422
 423             /* read correction pairs */
 424             for (i = 0; i < band->num_corr * 2; i++)
 425                 band->corr[i] = get_bits(&ctx->gb, 8);
 426         }
 427     }
 428
 429     if (band->blk_size == 8) {
 430         band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0];
 431         band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
 432     } else {
 433         band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0];
 434         band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];
 435     }
 436
 437     /* Indeo 4 doesn't use scale tables */
 438     band->intra_scale = NULL;
 439     band->inter_scale = NULL;
 440
 441     align_get_bits(&ctx->gb);
 442
 443     return 0;
 444 }
 445
 446
 447 /**
 448  *  Decode information (block type, cbp, quant delta, motion vector)
 449  *  for all macroblocks in the current tile.
 450  *
 451  *  @param[in,out] ctx       pointer to the decoder context
 452  *  @param[in,out] band      pointer to the band descriptor
 453  *  @param[in,out] tile      pointer to the tile descriptor
 454  *  @param[in]     avctx     pointer to the AVCodecContext
 455  *  @return        result code: 0 = OK, negative number = error
 456  */
 457 static int decode_mb_info(IVI4DecContext *ctx, IVIBandDesc *band,
 458                           IVITile *tile, AVCodecContext *avctx)
 459 {
 460     int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,
 461                 mv_scale, mb_type_bits;
 462     IVIMbInfo   *mb, *ref_mb;
 463     int         row_offset = band->mb_size * band->pitch;
 464
 465     mb     = tile->mbs;
 466     ref_mb = tile->ref_mbs;
 467     offs   = tile->ypos * band->pitch + tile->xpos;
 468
 469     blks_per_mb  = band->mb_size   != band->blk_size  ? 4 : 1;
 470     mb_type_bits = ctx->frame_type == FRAMETYPE_BIDIR ? 2 : 1;
 471
 472     /* scale factor for motion vectors */
 473     mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
 474     mv_x = mv_y = 0;
 475
 476     for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {
 477         mb_offset = offs;
 478
 479         for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {
 480             mb->xpos     = x;
 481             mb->ypos     = y;
 482             mb->buf_offs = mb_offset;
 483
 484             if (get_bits1(&ctx->gb)) {
 485                 if (ctx->frame_type == FRAMETYPE_INTRA) {
 486                     av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
 487                     return AVERROR_INVALIDDATA;
 488                 }
 489                 mb->type = 1; /* empty macroblocks are always INTER */
 490                 mb->cbp  = 0; /* all blocks are empty */
 491
 492                 mb->q_delta = 0;
 493                 if (!band->plane && !band->band_num && ctx->in_q) {
 494                     mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
 495                                            IVI_VLC_BITS, 1);
 496                     mb->q_delta = IVI_TOSIGNED(mb->q_delta);
 497                 }
 498
 499                 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
 500                 if (band->inherit_mv) {
 501                     /* motion vector inheritance */
 502                     if (mv_scale) {
 503                         mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
 504                         mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
 505                     } else {
 506                         mb->mv_x = ref_mb->mv_x;
 507                         mb->mv_y = ref_mb->mv_y;
 508                     }
 509                 }
 510             } else {
 511                 if (band->inherit_mv) {
 512                     mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
 513                 } else if (ctx->frame_type == FRAMETYPE_INTRA) {
 514                     mb->type = 0; /* mb_type is always INTRA for intra-frames */
 515                 } else {
 516                     mb->type = get_bits(&ctx->gb, mb_type_bits);
 517                 }
 518
 519                 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
 520
 521                 mb->q_delta = 0;
 522                 if (band->inherit_qdelta) {
 523                     if (ref_mb) mb->q_delta = ref_mb->q_delta;
 524                 } else if (mb->cbp || (!band->plane && !band->band_num &&
 525                            ctx->in_q)) {
 526                     mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
 527                                            IVI_VLC_BITS, 1);
 528                     mb->q_delta = IVI_TOSIGNED(mb->q_delta);
 529                 }
 530
 531                 if (!mb->type) {
 532                     mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
 533                 } else {
 534                     if (band->inherit_mv) {
 535                         /* motion vector inheritance */
 536                         if (mv_scale) {
 537                             mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
 538                             mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
 539                         } else {
 540                             mb->mv_x = ref_mb->mv_x;
 541                             mb->mv_y = ref_mb->mv_y;
 542                         }
 543                     } else {
 544                         /* decode motion vector deltas */
 545                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
 546                                             IVI_VLC_BITS, 1);
 547                         mv_y += IVI_TOSIGNED(mv_delta);
 548                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
 549                                             IVI_VLC_BITS, 1);
 550                         mv_x += IVI_TOSIGNED(mv_delta);
 551                         mb->mv_x = mv_x;
 552                         mb->mv_y = mv_y;
 553                     }
 554                 }
 555             }
 556
 557             mb++;
 558             if (ref_mb)
 559                 ref_mb++;
 560             mb_offset += band->mb_size;
 561         }
 562
 563         offs += row_offset;
 564     }
 565
 566     align_get_bits(&ctx->gb);
 567
 568     return 0;
 569 }
 570
 571
 572 /**
 573  *  Decode an Indeo 4 band.
 574  *
 575  *  @param[in,out] ctx       pointer to the decoder context
 576  *  @param[in,out] band      pointer to the band descriptor
 577  *  @param[in]     avctx     pointer to the AVCodecContext
 578  *  @return        result code: 0 = OK, negative number = error
 579  */
 580 static int decode_band(IVI4DecContext *ctx, int plane_num,
 581                        IVIBandDesc *band, AVCodecContext *avctx)
 582 {
 583     int         result, i, t, pos, idx1, idx2;
 584     IVITile     *tile;
 585
 586     band->buf     = band->bufs[ctx->dst_buf];
 587     band->ref_buf = band->bufs[ctx->ref_buf];
 588
 589     result = decode_band_hdr(ctx, band, avctx);
 590     if (result) {
 591         av_log(avctx, AV_LOG_ERROR, "Error decoding band header\n");
 592         return result;
 593     }
 594
 595     if (band->is_empty) {
 596         av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
 597         return AVERROR_INVALIDDATA;
 598     }
 599
 600     band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
 601
 602     /* apply corrections to the selected rvmap table if present */
 603     for (i = 0; i < band->num_corr; i++) {
 604         idx1 = band->corr[i * 2];
 605         idx2 = band->corr[i * 2 + 1];
 606         FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
 607         FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
 608     }
 609
 610     pos = get_bits_count(&ctx->gb);
 611
 612     for (t = 0; t < band->num_tiles; t++) {
 613         tile = &band->tiles[t];
 614
 615         tile->is_empty = get_bits1(&ctx->gb);
 616         if (tile->is_empty) {
 617             ff_ivi_process_empty_tile(avctx, band, tile,
 618                                       (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
 619             av_dlog(avctx, "Empty tile encountered!\n");
 620         } else {
 621             tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
 622             if (!tile->data_size) {
 623                 av_log(avctx, AV_LOG_ERROR, "Tile data size is zero!\n");
 624                 return AVERROR_INVALIDDATA;
 625             }
 626
 627             result = decode_mb_info(ctx, band, tile, avctx);
 628             if (result < 0)
 629                 break;
 630
 631             result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
 632             if (result < 0 || ((get_bits_count(&ctx->gb) - pos) >> 3) != tile->data_size) {
 633                 av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n");
 634                 break;
 635             }
 636
 637             pos += tile->data_size << 3; // skip to next tile
 638         }
 639     }
 640
 641     /* restore the selected rvmap table by applying its corrections in reverse order */
 642     for (i = band->num_corr - 1; i >= 0; i--) {
 643         idx1 = band->corr[i * 2];
 644         idx2 = band->corr[i * 2 + 1];
 645         FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
 646         FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
 647     }
 648
 649 #if defined(DEBUG) && IVI4_DEBUG_CHECKSUM
 650     if (band->checksum_present) {
 651         uint16_t chksum = ivi_calc_band_checksum(band);
 652         if (chksum != band->checksum) {
 653             av_log(avctx, AV_LOG_ERROR,
 654                    "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
 655                    band->plane, band->band_num, band->checksum, chksum);
 656         }
 657     }
 658 #endif
 659
 660     align_get_bits(&ctx->gb);
 661
 662     return 0;
 663 }
 664
 665
 666 static av_cold int decode_init(AVCodecContext *avctx)
 667 {
 668     IVI4DecContext *ctx = avctx->priv_data;
 669
 670     ff_ivi_init_static_vlc();
 671
 672     /* copy rvmap tables in our context so we can apply changes to them */
 673     memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
 674
 675     /* Force allocation of the internal buffers */
 676     /* during picture header decoding.          */
 677     ctx->pic_conf.pic_width  = 0;
 678     ctx->pic_conf.pic_height = 0;
 679
 680     avctx->pix_fmt = PIX_FMT_YUV410P;
 681
 682     return 0;
 683 }
 684
 685
 686 /**
 687  *  Rearrange decoding and reference buffers.
 688  *
 689  *  @param[in,out] ctx       pointer to the decoder context
 690  */
 691 static void switch_buffers(IVI4DecContext *ctx)
 692 {
 693     switch (ctx->prev_frame_type) {
 694     case FRAMETYPE_INTRA:
 695     case FRAMETYPE_INTER:
 696         ctx->buf_switch ^= 1;
 697         ctx->dst_buf     = ctx->buf_switch;
 698         ctx->ref_buf     = ctx->buf_switch ^ 1;
 699         break;
 700     case FRAMETYPE_INTER_NOREF:
 701         break;
 702     }
 703
 704     switch (ctx->frame_type) {
 705     case FRAMETYPE_INTRA:
 706         ctx->buf_switch = 0;
 707         /* FALLTHROUGH */
 708     case FRAMETYPE_INTER:
 709         ctx->dst_buf = ctx->buf_switch;
 710         ctx->ref_buf = ctx->buf_switch ^ 1;
 711         break;
 712     case FRAMETYPE_INTER_NOREF:
 713     case FRAMETYPE_NULL_FIRST:
 714     case FRAMETYPE_NULL_LAST:
 715         break;
 716     }
 717 }
 718
 719
 720 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
 721                         AVPacket *avpkt)
 722 {
 723     IVI4DecContext  *ctx = avctx->priv_data;
 724     const uint8_t   *buf = avpkt->data;
 725     int             buf_size = avpkt->size;
 726     int             result, p, b;
 727
 728     init_get_bits(&ctx->gb, buf, buf_size * 8);
 729
 730     result = decode_pic_hdr(ctx, avctx);
 731     if (result) {
 732         av_log(avctx, AV_LOG_ERROR, "Error decoding picture header\n");
 733         return result;
 734     }
 735
 736     switch_buffers(ctx);
 737
 738     if (ctx->frame_type < FRAMETYPE_NULL_FIRST) {
 739         for (p = 0; p < 3; p++) {
 740             for (b = 0; b < ctx->planes[p].num_bands; b++) {
 741                 result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
 742                 if (result) {
 743                     av_log(avctx, AV_LOG_ERROR,
 744                            "Error decoding band: %d, plane: %d\n", b, p);
 745                     return result;
 746                 }
 747             }
 748         }
 749     }
 750
 751     /* If the bidirectional mode is enabled, next I and the following P frame will */
 752     /* be sent together. Unfortunately the approach below seems to be the only way */
 753     /* to handle the B-frames mode. That's exactly the same Intel decoders do.     */
 754     if (ctx->frame_type == FRAMETYPE_INTRA) {
 755         while (get_bits(&ctx->gb, 8)); // skip version string
 756         skip_bits_long(&ctx->gb, 64);  // skip padding, TODO: implement correct 8-bytes alignment
 757         if (get_bits_left(&ctx->gb) > 18 && show_bits(&ctx->gb, 18) == 0x3FFF8)
 758             av_log(avctx, AV_LOG_ERROR, "Buffer contains IP frames!\n");
 759     }
 760
 761     if (ctx->frame.data[0])
 762         avctx->release_buffer(avctx, &ctx->frame);
 763
 764     ctx->frame.reference = 0;
 765     if ((result = avctx->get_buffer(avctx, &ctx->frame)) < 0) {
 766         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 767         return result;
 768     }
 769
 770     if (ctx->is_scalable) {
 771         ff_ivi_recompose_haar(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
 772     } else {
 773         ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
 774     }
 775
 776     ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
 777     ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
 778
 779     *data_size = sizeof(AVFrame);
 780     *(AVFrame*)data = ctx->frame;
 781
 782     return buf_size;
 783 }
 784
 785
 786 static av_cold int decode_close(AVCodecContext *avctx)
 787 {
 788     IVI4DecContext *ctx = avctx->priv_data;
 789
 790     ff_ivi_free_buffers(&ctx->planes[0]);
 791
 792     if (ctx->frame.data[0])
 793         avctx->release_buffer(avctx, &ctx->frame);
 794
 795 #if IVI4_STREAM_ANALYSER
 796     if (ctx->is_scalable)
 797         av_log(avctx, AV_LOG_ERROR, "This video uses scalability mode!\n");
 798     if (ctx->uses_tiling)
 799         av_log(avctx, AV_LOG_ERROR, "This video uses local decoding!\n");
 800     if (ctx->has_b_frames)
 801         av_log(avctx, AV_LOG_ERROR, "This video contains B-frames!\n");
 802     if (ctx->has_transp)
 803         av_log(avctx, AV_LOG_ERROR, "Transparency mode is enabled!\n");
 804     if (ctx->uses_haar)
 805         av_log(avctx, AV_LOG_ERROR, "This video uses Haar transform!\n");
 806     if (ctx->uses_fullpel)
 807         av_log(avctx, AV_LOG_ERROR, "This video uses fullpel motion vectors!\n");
 808 #endif
 809
 810     return 0;
 811 }
 812
 813
 814 AVCodec ff_indeo4_decoder = {
 815     .name           = "indeo4",
 816     .type           = AVMEDIA_TYPE_VIDEO,
 817     .id             = CODEC_ID_INDEO4,
 818     .priv_data_size = sizeof(IVI4DecContext),
 819     .init           = decode_init,
 820     .close          = decode_close,
 821     .decode         = decode_frame,
 822     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
 823 };