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  1. /*
  2.  * Indeo Video Interactive v5 compatible decoder
  3.  * Copyright (c) 2009 Maxim Poliakovski
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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 "ivi.h"
  34. #include "ivi_dsp.h"
  35. #include "indeo5data.h"
  36.  
  37. /**
  38.  *  Indeo5 frame types.
  39.  */
  40. enum {
  41.     FRAMETYPE_INTRA       = 0,
  42.     FRAMETYPE_INTER       = 1,  ///< non-droppable P-frame
  43.     FRAMETYPE_INTER_SCAL  = 2,  ///< droppable P-frame used in the scalability mode
  44.     FRAMETYPE_INTER_NOREF = 3,  ///< droppable P-frame
  45.     FRAMETYPE_NULL        = 4   ///< empty frame with no data
  46. };
  47.  
  48. #define IVI5_PIC_SIZE_ESC       15
  49.  
  50. /**
  51.  *  Decode Indeo5 GOP (Group of pictures) header.
  52.  *  This header is present in key frames only.
  53.  *  It defines parameters for all frames in a GOP.
  54.  *
  55.  *  @param[in,out] ctx    ptr to the decoder context
  56.  *  @param[in]     avctx  ptr to the AVCodecContext
  57.  *  @return         result code: 0 = OK, -1 = error
  58.  */
  59. static int decode_gop_header(IVI45DecContext *ctx, AVCodecContext *avctx)
  60. {
  61.     int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size, is_scalable;
  62.     int             quant_mat, blk_size_changed = 0;
  63.     IVIBandDesc     *band, *band1, *band2;
  64.     IVIPicConfig    pic_conf;
  65.  
  66.     ctx->gop_flags = get_bits(&ctx->gb, 8);
  67.  
  68.     ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
  69.  
  70.     if (ctx->gop_flags & IVI5_IS_PROTECTED)
  71.         ctx->lock_word = get_bits_long(&ctx->gb, 32);
  72.  
  73.     tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
  74.     if (tile_size > 256) {
  75.         av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
  76.         return AVERROR_INVALIDDATA;
  77.     }
  78.  
  79.     /* decode number of wavelet bands */
  80.     /* num_levels * 3 + 1 */
  81.     pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;
  82.     pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;
  83.     is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
  84.     if (is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
  85.         av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
  86.                pic_conf.luma_bands, pic_conf.chroma_bands);
  87.         return AVERROR_INVALIDDATA;
  88.     }
  89.  
  90.     pic_size_indx = get_bits(&ctx->gb, 4);
  91.     if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
  92.         pic_conf.pic_height = get_bits(&ctx->gb, 13);
  93.         pic_conf.pic_width  = get_bits(&ctx->gb, 13);
  94.     } else {
  95.         pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
  96.         pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;
  97.     }
  98.  
  99.     if (ctx->gop_flags & 2) {
  100.         avpriv_report_missing_feature(avctx, "YV12 picture format");
  101.         return AVERROR_PATCHWELCOME;
  102.     }
  103.  
  104.     pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
  105.     pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
  106.  
  107.     if (!tile_size) {
  108.         pic_conf.tile_height = pic_conf.pic_height;
  109.         pic_conf.tile_width  = pic_conf.pic_width;
  110.     } else {
  111.         pic_conf.tile_height = pic_conf.tile_width = tile_size;
  112.     }
  113.  
  114.     /* check if picture layout was changed and reallocate buffers */
  115.     if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf) || ctx->gop_invalid) {
  116.         result = ff_ivi_init_planes(ctx->planes, &pic_conf, 0);
  117.         if (result < 0) {
  118.             av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
  119.             return result;
  120.         }
  121.         ctx->pic_conf = pic_conf;
  122.         ctx->is_scalable = is_scalable;
  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.             if (p==0 && blk_size==4) {
  137.                 av_log(avctx, AV_LOG_ERROR, "4x4 luma blocks are unsupported!\n");
  138.                 return AVERROR_PATCHWELCOME;
  139.             }
  140.  
  141.             blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
  142.             if (blk_size_changed) {
  143.                 band->mb_size  = mb_size;
  144.                 band->blk_size = blk_size;
  145.             }
  146.  
  147.             if (get_bits1(&ctx->gb)) {
  148.                 avpriv_report_missing_feature(avctx, "Extended transform info");
  149.                 return AVERROR_PATCHWELCOME;
  150.             }
  151.  
  152.             /* select transform function and scan pattern according to plane and band number */
  153.             switch ((p << 2) + i) {
  154.             case 0:
  155.                 band->inv_transform  = ff_ivi_inverse_slant_8x8;
  156.                 band->dc_transform   = ff_ivi_dc_slant_2d;
  157.                 band->scan           = ff_zigzag_direct;
  158.                 band->transform_size = 8;
  159.                 break;
  160.  
  161.             case 1:
  162.                 band->inv_transform  = ff_ivi_row_slant8;
  163.                 band->dc_transform   = ff_ivi_dc_row_slant;
  164.                 band->scan           = ff_ivi_vertical_scan_8x8;
  165.                 band->transform_size = 8;
  166.                 break;
  167.  
  168.             case 2:
  169.                 band->inv_transform  = ff_ivi_col_slant8;
  170.                 band->dc_transform   = ff_ivi_dc_col_slant;
  171.                 band->scan           = ff_ivi_horizontal_scan_8x8;
  172.                 band->transform_size = 8;
  173.                 break;
  174.  
  175.             case 3:
  176.                 band->inv_transform  = ff_ivi_put_pixels_8x8;
  177.                 band->dc_transform   = ff_ivi_put_dc_pixel_8x8;
  178.                 band->scan           = ff_ivi_horizontal_scan_8x8;
  179.                 band->transform_size = 8;
  180.                 break;
  181.  
  182.             case 4:
  183.                 band->inv_transform  = ff_ivi_inverse_slant_4x4;
  184.                 band->dc_transform   = ff_ivi_dc_slant_2d;
  185.                 band->scan           = ff_ivi_direct_scan_4x4;
  186.                 band->transform_size = 4;
  187.                 break;
  188.             }
  189.  
  190.             band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
  191.                                 band->inv_transform == ff_ivi_inverse_slant_4x4;
  192.  
  193.             if (band->transform_size != band->blk_size) {
  194.                 av_log(avctx, AV_LOG_ERROR, "transform and block size mismatch (%d != %d)\n", band->transform_size, band->blk_size);
  195.                 return AVERROR_INVALIDDATA;
  196.             }
  197.  
  198.             /* select dequant matrix according to plane and band number */
  199.             if (!p) {
  200.                 quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
  201.             } else {
  202.                 quant_mat = 5;
  203.             }
  204.  
  205.             if (band->blk_size == 8) {
  206.                 if(quant_mat >= 5){
  207.                     av_log(avctx, AV_LOG_ERROR, "quant_mat %d too large!\n", quant_mat);
  208.                     return -1;
  209.                 }
  210.                 band->intra_base  = &ivi5_base_quant_8x8_intra[quant_mat][0];
  211.                 band->inter_base  = &ivi5_base_quant_8x8_inter[quant_mat][0];
  212.                 band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0];
  213.                 band->inter_scale = &ivi5_scale_quant_8x8_inter[quant_mat][0];
  214.             } else {
  215.                 band->intra_base  = ivi5_base_quant_4x4_intra;
  216.                 band->inter_base  = ivi5_base_quant_4x4_inter;
  217.                 band->intra_scale = ivi5_scale_quant_4x4_intra;
  218.                 band->inter_scale = ivi5_scale_quant_4x4_inter;
  219.             }
  220.  
  221.             if (get_bits(&ctx->gb, 2)) {
  222.                 av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
  223.                 return AVERROR_INVALIDDATA;
  224.             }
  225.         }
  226.     }
  227.  
  228.     /* copy chroma parameters into the 2nd chroma plane */
  229.     for (i = 0; i < pic_conf.chroma_bands; i++) {
  230.         band1 = &ctx->planes[1].bands[i];
  231.         band2 = &ctx->planes[2].bands[i];
  232.  
  233.         band2->width         = band1->width;
  234.         band2->height        = band1->height;
  235.         band2->mb_size       = band1->mb_size;
  236.         band2->blk_size      = band1->blk_size;
  237.         band2->is_halfpel    = band1->is_halfpel;
  238.         band2->intra_base    = band1->intra_base;
  239.         band2->inter_base    = band1->inter_base;
  240.         band2->intra_scale   = band1->intra_scale;
  241.         band2->inter_scale   = band1->inter_scale;
  242.         band2->scan          = band1->scan;
  243.         band2->inv_transform = band1->inv_transform;
  244.         band2->dc_transform  = band1->dc_transform;
  245.         band2->is_2d_trans   = band1->is_2d_trans;
  246.         band2->transform_size= band1->transform_size;
  247.     }
  248.  
  249.     /* reallocate internal structures if needed */
  250.     if (blk_size_changed) {
  251.         result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
  252.                                    pic_conf.tile_height);
  253.         if (result < 0) {
  254.             av_log(avctx, AV_LOG_ERROR,
  255.                    "Couldn't reallocate internal structures!\n");
  256.             return result;
  257.         }
  258.     }
  259.  
  260.     if (ctx->gop_flags & 8) {
  261.         if (get_bits(&ctx->gb, 3)) {
  262.             av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
  263.             return AVERROR_INVALIDDATA;
  264.         }
  265.  
  266.         if (get_bits1(&ctx->gb))
  267.             skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
  268.     }
  269.  
  270.     align_get_bits(&ctx->gb);
  271.  
  272.     skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
  273.  
  274.     /* skip GOP extension if any */
  275.     if (get_bits1(&ctx->gb)) {
  276.         do {
  277.             i = get_bits(&ctx->gb, 16);
  278.         } while (i & 0x8000);
  279.     }
  280.  
  281.     align_get_bits(&ctx->gb);
  282.  
  283.     return 0;
  284. }
  285.  
  286.  
  287. /**
  288.  *  Skip a header extension.
  289.  *
  290.  *  @param[in,out]  gb  the GetBit context
  291.  */
  292. static inline int skip_hdr_extension(GetBitContext *gb)
  293. {
  294.     int i, len;
  295.  
  296.     do {
  297.         len = get_bits(gb, 8);
  298.         if (8*len > get_bits_left(gb))
  299.             return AVERROR_INVALIDDATA;
  300.         for (i = 0; i < len; i++) skip_bits(gb, 8);
  301.     } while(len);
  302.  
  303.     return 0;
  304. }
  305.  
  306.  
  307. /**
  308.  *  Decode Indeo5 picture header.
  309.  *
  310.  *  @param[in,out]  ctx    ptr to the decoder context
  311.  *  @param[in]      avctx  ptr to the AVCodecContext
  312.  *  @return         result code: 0 = OK, -1 = error
  313.  */
  314. static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
  315. {
  316.     int ret;
  317.  
  318.     if (get_bits(&ctx->gb, 5) != 0x1F) {
  319.         av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
  320.         return AVERROR_INVALIDDATA;
  321.     }
  322.  
  323.     ctx->prev_frame_type = ctx->frame_type;
  324.     ctx->frame_type      = get_bits(&ctx->gb, 3);
  325.     if (ctx->frame_type >= 5) {
  326.         av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
  327.         return AVERROR_INVALIDDATA;
  328.     }
  329.  
  330.     ctx->frame_num = get_bits(&ctx->gb, 8);
  331.  
  332.     if (ctx->frame_type == FRAMETYPE_INTRA) {
  333.         if ((ret = decode_gop_header(ctx, avctx)) < 0) {
  334.             av_log(avctx, AV_LOG_ERROR, "Invalid GOP header, skipping frames.\n");
  335.             ctx->gop_invalid = 1;
  336.             return ret;
  337.         }
  338.         ctx->gop_invalid = 0;
  339.     }
  340.  
  341.     if (ctx->frame_type == FRAMETYPE_INTER_SCAL && !ctx->is_scalable) {
  342.         av_log(avctx, AV_LOG_ERROR, "Scalable inter frame in non scalable stream\n");
  343.         ctx->frame_type = FRAMETYPE_INTER;
  344.         return AVERROR_INVALIDDATA;
  345.     }
  346.  
  347.     if (ctx->frame_type != FRAMETYPE_NULL) {
  348.         ctx->frame_flags = get_bits(&ctx->gb, 8);
  349.  
  350.         ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
  351.  
  352.         ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
  353.  
  354.         /* skip unknown extension if any */
  355.         if (ctx->frame_flags & 0x20)
  356.             skip_hdr_extension(&ctx->gb); /* XXX: untested */
  357.  
  358.         /* decode macroblock huffman codebook */
  359.         ret = ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40,
  360.                                    IVI_MB_HUFF, &ctx->mb_vlc, avctx);
  361.         if (ret < 0)
  362.             return ret;
  363.  
  364.         skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
  365.     }
  366.  
  367.     align_get_bits(&ctx->gb);
  368.  
  369.     return 0;
  370. }
  371.  
  372.  
  373. /**
  374.  *  Decode Indeo5 band header.
  375.  *
  376.  *  @param[in,out]  ctx    ptr to the decoder context
  377.  *  @param[in,out]  band   ptr to the band descriptor
  378.  *  @param[in]      avctx  ptr to the AVCodecContext
  379.  *  @return         result code: 0 = OK, -1 = error
  380.  */
  381. static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
  382.                            AVCodecContext *avctx)
  383. {
  384.     int         i, ret;
  385.     uint8_t     band_flags;
  386.  
  387.     band_flags = get_bits(&ctx->gb, 8);
  388.  
  389.     if (band_flags & 1) {
  390.         band->is_empty = 1;
  391.         return 0;
  392.     }
  393.  
  394.     band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
  395.  
  396.     band->inherit_mv     = band_flags & 2;
  397.     band->inherit_qdelta = band_flags & 8;
  398.     band->qdelta_present = band_flags & 4;
  399.     if (!band->qdelta_present) band->inherit_qdelta = 1;
  400.  
  401.     /* decode rvmap probability corrections if any */
  402.     band->num_corr = 0; /* there are no corrections */
  403.     if (band_flags & 0x10) {
  404.         band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
  405.         if (band->num_corr > 61) {
  406.             av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
  407.                    band->num_corr);
  408.             return AVERROR_INVALIDDATA;
  409.         }
  410.  
  411.         /* read correction pairs */
  412.         for (i = 0; i < band->num_corr * 2; i++)
  413.             band->corr[i] = get_bits(&ctx->gb, 8);
  414.     }
  415.  
  416.     /* select appropriate rvmap table for this band */
  417.     band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
  418.  
  419.     /* decode block huffman codebook */
  420.     ret = ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF,
  421.                                &band->blk_vlc, avctx);
  422.     if (ret < 0)
  423.         return ret;
  424.  
  425.     band->checksum_present = get_bits1(&ctx->gb);
  426.     if (band->checksum_present)
  427.         band->checksum = get_bits(&ctx->gb, 16);
  428.  
  429.     band->glob_quant = get_bits(&ctx->gb, 5);
  430.  
  431.     /* skip unknown extension if any */
  432.     if (band_flags & 0x20) { /* XXX: untested */
  433.         align_get_bits(&ctx->gb);
  434.         skip_hdr_extension(&ctx->gb);
  435.     }
  436.  
  437.     align_get_bits(&ctx->gb);
  438.  
  439.     return 0;
  440. }
  441.  
  442.  
  443. /**
  444.  *  Decode info (block type, cbp, quant delta, motion vector)
  445.  *  for all macroblocks in the current tile.
  446.  *
  447.  *  @param[in,out]  ctx    ptr to the decoder context
  448.  *  @param[in,out]  band   ptr to the band descriptor
  449.  *  @param[in,out]  tile   ptr to the tile descriptor
  450.  *  @param[in]      avctx  ptr to the AVCodecContext
  451.  *  @return         result code: 0 = OK, -1 = error
  452.  */
  453. static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
  454.                           IVITile *tile, AVCodecContext *avctx)
  455. {
  456.     int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
  457.                 mv_scale, blks_per_mb, s;
  458.     IVIMbInfo   *mb, *ref_mb;
  459.     int         row_offset = band->mb_size * band->pitch;
  460.  
  461.     mb     = tile->mbs;
  462.     ref_mb = tile->ref_mbs;
  463.     offs   = tile->ypos * band->pitch + tile->xpos;
  464.  
  465.     if (!ref_mb &&
  466.         ((band->qdelta_present && band->inherit_qdelta) || band->inherit_mv))
  467.         return AVERROR_INVALIDDATA;
  468.  
  469.     if (tile->num_MBs != IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size)) {
  470.         av_log(avctx, AV_LOG_ERROR, "Allocated tile size %d mismatches parameters %d\n",
  471.                tile->num_MBs, IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size));
  472.         return AVERROR_INVALIDDATA;
  473.     }
  474.  
  475.     /* scale factor for motion vectors */
  476.     mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
  477.     mv_x = mv_y = 0;
  478.  
  479.     for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
  480.         mb_offset = offs;
  481.  
  482.         for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
  483.             mb->xpos     = x;
  484.             mb->ypos     = y;
  485.             mb->buf_offs = mb_offset;
  486.  
  487.             if (get_bits1(&ctx->gb)) {
  488.                 if (ctx->frame_type == FRAMETYPE_INTRA) {
  489.                     av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
  490.                     return AVERROR_INVALIDDATA;
  491.                 }
  492.                 mb->type = 1; /* empty macroblocks are always INTER */
  493.                 mb->cbp  = 0; /* all blocks are empty */
  494.  
  495.                 mb->q_delta = 0;
  496.                 if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
  497.                     mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
  498.                                            IVI_VLC_BITS, 1);
  499.                     mb->q_delta = IVI_TOSIGNED(mb->q_delta);
  500.                 }
  501.  
  502.                 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
  503.                 if (band->inherit_mv && ref_mb){
  504.                     /* motion vector inheritance */
  505.                     if (mv_scale) {
  506.                         mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
  507.                         mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
  508.                     } else {
  509.                         mb->mv_x = ref_mb->mv_x;
  510.                         mb->mv_y = ref_mb->mv_y;
  511.                     }
  512.                 }
  513.             } else {
  514.                 if (band->inherit_mv && ref_mb) {
  515.                     mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
  516.                 } else if (ctx->frame_type == FRAMETYPE_INTRA) {
  517.                     mb->type = 0; /* mb_type is always INTRA for intra-frames */
  518.                 } else {
  519.                     mb->type = get_bits1(&ctx->gb);
  520.                 }
  521.  
  522.                 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
  523.                 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
  524.  
  525.                 mb->q_delta = 0;
  526.                 if (band->qdelta_present) {
  527.                     if (band->inherit_qdelta) {
  528.                         if (ref_mb) mb->q_delta = ref_mb->q_delta;
  529.                     } else if (mb->cbp || (!band->plane && !band->band_num &&
  530.                                            (ctx->frame_flags & 8))) {
  531.                         mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
  532.                                                IVI_VLC_BITS, 1);
  533.                         mb->q_delta = IVI_TOSIGNED(mb->q_delta);
  534.                     }
  535.                 }
  536.  
  537.                 if (!mb->type) {
  538.                     mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
  539.                 } else {
  540.                     if (band->inherit_mv && ref_mb){
  541.                         /* motion vector inheritance */
  542.                         if (mv_scale) {
  543.                             mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
  544.                             mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
  545.                         } else {
  546.                             mb->mv_x = ref_mb->mv_x;
  547.                             mb->mv_y = ref_mb->mv_y;
  548.                         }
  549.                     } else {
  550.                         /* decode motion vector deltas */
  551.                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
  552.                                             IVI_VLC_BITS, 1);
  553.                         mv_y += IVI_TOSIGNED(mv_delta);
  554.                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
  555.                                             IVI_VLC_BITS, 1);
  556.                         mv_x += IVI_TOSIGNED(mv_delta);
  557.                         mb->mv_x = mv_x;
  558.                         mb->mv_y = mv_y;
  559.                     }
  560.                 }
  561.             }
  562.  
  563.             s= band->is_halfpel;
  564.             if (mb->type)
  565.             if ( x +  (mb->mv_x   >>s) +                 (y+               (mb->mv_y   >>s))*band->pitch < 0 ||
  566.                  x + ((mb->mv_x+s)>>s) + band->mb_size - 1
  567.                    + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize - 1) {
  568.                 av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
  569.                 return AVERROR_INVALIDDATA;
  570.             }
  571.  
  572.             mb++;
  573.             if (ref_mb)
  574.                 ref_mb++;
  575.             mb_offset += band->mb_size;
  576.         }
  577.  
  578.         offs += row_offset;
  579.     }
  580.  
  581.     align_get_bits(&ctx->gb);
  582.  
  583.     return 0;
  584. }
  585.  
  586.  
  587. /**
  588.  *  Switch buffers.
  589.  *
  590.  *  @param[in,out] ctx  ptr to the decoder context
  591.  */
  592. static void switch_buffers(IVI45DecContext *ctx)
  593. {
  594.     switch (ctx->prev_frame_type) {
  595.     case FRAMETYPE_INTRA:
  596.     case FRAMETYPE_INTER:
  597.         ctx->buf_switch ^= 1;
  598.         ctx->dst_buf = ctx->buf_switch;
  599.         ctx->ref_buf = ctx->buf_switch ^ 1;
  600.         break;
  601.     case FRAMETYPE_INTER_SCAL:
  602.         if (!ctx->inter_scal) {
  603.             ctx->ref2_buf   = 2;
  604.             ctx->inter_scal = 1;
  605.         }
  606.         FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);
  607.         ctx->ref_buf = ctx->ref2_buf;
  608.         break;
  609.     case FRAMETYPE_INTER_NOREF:
  610.         break;
  611.     }
  612.  
  613.     switch (ctx->frame_type) {
  614.     case FRAMETYPE_INTRA:
  615.         ctx->buf_switch = 0;
  616.         /* FALLTHROUGH */
  617.     case FRAMETYPE_INTER:
  618.         ctx->inter_scal = 0;
  619.         ctx->dst_buf = ctx->buf_switch;
  620.         ctx->ref_buf = ctx->buf_switch ^ 1;
  621.         break;
  622.     case FRAMETYPE_INTER_SCAL:
  623.     case FRAMETYPE_INTER_NOREF:
  624.     case FRAMETYPE_NULL:
  625.         break;
  626.     }
  627. }
  628.  
  629.  
  630. static int is_nonnull_frame(IVI45DecContext *ctx)
  631. {
  632.     return ctx->frame_type != FRAMETYPE_NULL;
  633. }
  634.  
  635.  
  636. /**
  637.  *  Initialize Indeo5 decoder.
  638.  */
  639. static av_cold int decode_init(AVCodecContext *avctx)
  640. {
  641.     IVI45DecContext  *ctx = avctx->priv_data;
  642.     int             result;
  643.  
  644.     ff_ivi_init_static_vlc();
  645.  
  646.     /* copy rvmap tables in our context so we can apply changes to them */
  647.     memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
  648.  
  649.     /* set the initial picture layout according to the basic profile:
  650.        there is only one band per plane (no scalability), only one tile (no local decoding)
  651.        and picture format = YVU9 */
  652.     ctx->pic_conf.pic_width     = avctx->width;
  653.     ctx->pic_conf.pic_height    = avctx->height;
  654.     ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
  655.     ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
  656.     ctx->pic_conf.tile_width    = avctx->width;
  657.     ctx->pic_conf.tile_height   = avctx->height;
  658.     ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
  659.  
  660.     result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf, 0);
  661.     if (result) {
  662.         av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
  663.         return AVERROR_INVALIDDATA;
  664.     }
  665.  
  666.     ctx->buf_switch = 0;
  667.     ctx->inter_scal = 0;
  668.  
  669.     ctx->decode_pic_hdr   = decode_pic_hdr;
  670.     ctx->decode_band_hdr  = decode_band_hdr;
  671.     ctx->decode_mb_info   = decode_mb_info;
  672.     ctx->switch_buffers   = switch_buffers;
  673.     ctx->is_nonnull_frame = is_nonnull_frame;
  674.  
  675.     ctx->is_indeo4 = 0;
  676.  
  677.     avctx->pix_fmt = AV_PIX_FMT_YUV410P;
  678.  
  679.     return 0;
  680. }
  681.  
  682. AVCodec ff_indeo5_decoder = {
  683.     .name           = "indeo5",
  684.     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
  685.     .type           = AVMEDIA_TYPE_VIDEO,
  686.     .id             = AV_CODEC_ID_INDEO5,
  687.     .priv_data_size = sizeof(IVI45DecContext),
  688.     .init           = decode_init,
  689.     .close          = ff_ivi_decode_close,
  690.     .decode         = ff_ivi_decode_frame,
  691.     .capabilities   = AV_CODEC_CAP_DR1,
  692. };
  693.