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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 "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, is_scalable;
  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 AVERROR_INVALIDDATA;
  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.     is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
  85.     if (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 AVERROR_INVALIDDATA;
  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.         avpriv_report_missing_feature(avctx, "YV12 picture format");
  102.         return AVERROR_PATCHWELCOME;
  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) || ctx->gop_invalid) {
  117.         result = ff_ivi_init_planes(ctx->planes, &pic_conf);
  118.         if (result < 0) {
  119.             av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
  120.             return result;
  121.         }
  122.         ctx->pic_conf = pic_conf;
  123.         ctx->is_scalable = is_scalable;
  124.         blk_size_changed = 1; /* force reallocation of the internal structures */
  125.     }
  126.  
  127.     for (p = 0; p <= 1; p++) {
  128.         for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
  129.             band = &ctx->planes[p].bands[i];
  130.  
  131.             band->is_halfpel = get_bits1(&ctx->gb);
  132.  
  133.             mb_size  = get_bits1(&ctx->gb);
  134.             blk_size = 8 >> get_bits1(&ctx->gb);
  135.             mb_size  = blk_size << !mb_size;
  136.  
  137.             if (p==0 && blk_size==4) {
  138.                 av_log(avctx, AV_LOG_ERROR, "4x4 luma blocks are unsupported!\n");
  139.                 return AVERROR_PATCHWELCOME;
  140.             }
  141.  
  142.             blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
  143.             if (blk_size_changed) {
  144.                 band->mb_size  = mb_size;
  145.                 band->blk_size = blk_size;
  146.             }
  147.  
  148.             if (get_bits1(&ctx->gb)) {
  149.                 avpriv_report_missing_feature(avctx, "Extended transform info");
  150.                 return AVERROR_PATCHWELCOME;
  151.             }
  152.  
  153.             /* select transform function and scan pattern according to plane and band number */
  154.             switch ((p << 2) + i) {
  155.             case 0:
  156.                 band->inv_transform  = ff_ivi_inverse_slant_8x8;
  157.                 band->dc_transform   = ff_ivi_dc_slant_2d;
  158.                 band->scan           = ff_zigzag_direct;
  159.                 band->transform_size = 8;
  160.                 break;
  161.  
  162.             case 1:
  163.                 band->inv_transform  = ff_ivi_row_slant8;
  164.                 band->dc_transform   = ff_ivi_dc_row_slant;
  165.                 band->scan           = ff_ivi_vertical_scan_8x8;
  166.                 band->transform_size = 8;
  167.                 break;
  168.  
  169.             case 2:
  170.                 band->inv_transform  = ff_ivi_col_slant8;
  171.                 band->dc_transform   = ff_ivi_dc_col_slant;
  172.                 band->scan           = ff_ivi_horizontal_scan_8x8;
  173.                 band->transform_size = 8;
  174.                 break;
  175.  
  176.             case 3:
  177.                 band->inv_transform  = ff_ivi_put_pixels_8x8;
  178.                 band->dc_transform   = ff_ivi_put_dc_pixel_8x8;
  179.                 band->scan           = ff_ivi_horizontal_scan_8x8;
  180.                 band->transform_size = 8;
  181.                 break;
  182.  
  183.             case 4:
  184.                 band->inv_transform  = ff_ivi_inverse_slant_4x4;
  185.                 band->dc_transform   = ff_ivi_dc_slant_2d;
  186.                 band->scan           = ff_ivi_direct_scan_4x4;
  187.                 band->transform_size = 4;
  188.                 break;
  189.             }
  190.  
  191.             band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
  192.                                 band->inv_transform == ff_ivi_inverse_slant_4x4;
  193.  
  194.             if (band->transform_size != band->blk_size) {
  195.                 av_log(avctx, AV_LOG_ERROR, "transform and block size mismatch (%d != %d)\n", band->transform_size, band->blk_size);
  196.                 return AVERROR_INVALIDDATA;
  197.             }
  198.  
  199.             /* select dequant matrix according to plane and band number */
  200.             if (!p) {
  201.                 quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
  202.             } else {
  203.                 quant_mat = 5;
  204.             }
  205.  
  206.             if (band->blk_size == 8) {
  207.                 if(quant_mat >= 5){
  208.                     av_log(avctx, AV_LOG_ERROR, "quant_mat %d too large!\n", quant_mat);
  209.                     return -1;
  210.                 }
  211.                 band->intra_base  = &ivi5_base_quant_8x8_intra[quant_mat][0];
  212.                 band->inter_base  = &ivi5_base_quant_8x8_inter[quant_mat][0];
  213.                 band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0];
  214.                 band->inter_scale = &ivi5_scale_quant_8x8_inter[quant_mat][0];
  215.             } else {
  216.                 band->intra_base  = ivi5_base_quant_4x4_intra;
  217.                 band->inter_base  = ivi5_base_quant_4x4_inter;
  218.                 band->intra_scale = ivi5_scale_quant_4x4_intra;
  219.                 band->inter_scale = ivi5_scale_quant_4x4_inter;
  220.             }
  221.  
  222.             if (get_bits(&ctx->gb, 2)) {
  223.                 av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
  224.                 return AVERROR_INVALIDDATA;
  225.             }
  226.         }
  227.     }
  228.  
  229.     /* copy chroma parameters into the 2nd chroma plane */
  230.     for (i = 0; i < pic_conf.chroma_bands; i++) {
  231.         band1 = &ctx->planes[1].bands[i];
  232.         band2 = &ctx->planes[2].bands[i];
  233.  
  234.         band2->width         = band1->width;
  235.         band2->height        = band1->height;
  236.         band2->mb_size       = band1->mb_size;
  237.         band2->blk_size      = band1->blk_size;
  238.         band2->is_halfpel    = band1->is_halfpel;
  239.         band2->intra_base    = band1->intra_base;
  240.         band2->inter_base    = band1->inter_base;
  241.         band2->intra_scale   = band1->intra_scale;
  242.         band2->inter_scale   = band1->inter_scale;
  243.         band2->scan          = band1->scan;
  244.         band2->inv_transform = band1->inv_transform;
  245.         band2->dc_transform  = band1->dc_transform;
  246.         band2->is_2d_trans   = band1->is_2d_trans;
  247.         band2->transform_size= band1->transform_size;
  248.     }
  249.  
  250.     /* reallocate internal structures if needed */
  251.     if (blk_size_changed) {
  252.         result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
  253.                                    pic_conf.tile_height);
  254.         if (result < 0) {
  255.             av_log(avctx, AV_LOG_ERROR,
  256.                    "Couldn't reallocate internal structures!\n");
  257.             return result;
  258.         }
  259.     }
  260.  
  261.     if (ctx->gop_flags & 8) {
  262.         if (get_bits(&ctx->gb, 3)) {
  263.             av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
  264.             return AVERROR_INVALIDDATA;
  265.         }
  266.  
  267.         if (get_bits1(&ctx->gb))
  268.             skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
  269.     }
  270.  
  271.     align_get_bits(&ctx->gb);
  272.  
  273.     skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
  274.  
  275.     /* skip GOP extension if any */
  276.     if (get_bits1(&ctx->gb)) {
  277.         do {
  278.             i = get_bits(&ctx->gb, 16);
  279.         } while (i & 0x8000);
  280.     }
  281.  
  282.     align_get_bits(&ctx->gb);
  283.  
  284.     return 0;
  285. }
  286.  
  287.  
  288. /**
  289.  *  Skip a header extension.
  290.  *
  291.  *  @param[in,out]  gb  the GetBit context
  292.  */
  293. static inline void skip_hdr_extension(GetBitContext *gb)
  294. {
  295.     int i, len;
  296.  
  297.     do {
  298.         len = get_bits(gb, 8);
  299.         for (i = 0; i < len; i++) skip_bits(gb, 8);
  300.     } while(len);
  301. }
  302.  
  303.  
  304. /**
  305.  *  Decode Indeo5 picture header.
  306.  *
  307.  *  @param[in,out]  ctx    ptr to the decoder context
  308.  *  @param[in]      avctx  ptr to the AVCodecContext
  309.  *  @return         result code: 0 = OK, -1 = error
  310.  */
  311. static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
  312. {
  313.     int ret;
  314.  
  315.     if (get_bits(&ctx->gb, 5) != 0x1F) {
  316.         av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
  317.         return AVERROR_INVALIDDATA;
  318.     }
  319.  
  320.     ctx->prev_frame_type = ctx->frame_type;
  321.     ctx->frame_type      = get_bits(&ctx->gb, 3);
  322.     if (ctx->frame_type >= 5) {
  323.         av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
  324.         return AVERROR_INVALIDDATA;
  325.     }
  326.  
  327.     ctx->frame_num = get_bits(&ctx->gb, 8);
  328.  
  329.     if (ctx->frame_type == FRAMETYPE_INTRA) {
  330.         if ((ret = decode_gop_header(ctx, avctx)) < 0) {
  331.             av_log(avctx, AV_LOG_ERROR, "Invalid GOP header, skipping frames.\n");
  332.             ctx->gop_invalid = 1;
  333.             return ret;
  334.         }
  335.         ctx->gop_invalid = 0;
  336.     }
  337.  
  338.     if (ctx->frame_type == FRAMETYPE_INTER_SCAL && !ctx->is_scalable) {
  339.         av_log(avctx, AV_LOG_ERROR, "Scalable inter frame in non scaleable stream\n");
  340.         ctx->frame_type = FRAMETYPE_INTER;
  341.         return AVERROR_INVALIDDATA;
  342.     }
  343.  
  344.     if (ctx->frame_type != FRAMETYPE_NULL) {
  345.         ctx->frame_flags = get_bits(&ctx->gb, 8);
  346.  
  347.         ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
  348.  
  349.         ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
  350.  
  351.         /* skip unknown extension if any */
  352.         if (ctx->frame_flags & 0x20)
  353.             skip_hdr_extension(&ctx->gb); /* XXX: untested */
  354.  
  355.         /* decode macroblock huffman codebook */
  356.         ret = ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40,
  357.                                    IVI_MB_HUFF, &ctx->mb_vlc, avctx);
  358.         if (ret < 0)
  359.             return ret;
  360.  
  361.         skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
  362.     }
  363.  
  364.     align_get_bits(&ctx->gb);
  365.  
  366.     return 0;
  367. }
  368.  
  369.  
  370. /**
  371.  *  Decode Indeo5 band header.
  372.  *
  373.  *  @param[in,out]  ctx    ptr to the decoder context
  374.  *  @param[in,out]  band   ptr to the band descriptor
  375.  *  @param[in]      avctx  ptr to the AVCodecContext
  376.  *  @return         result code: 0 = OK, -1 = error
  377.  */
  378. static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
  379.                            AVCodecContext *avctx)
  380. {
  381.     int         i, ret;
  382.     uint8_t     band_flags;
  383.  
  384.     band_flags = get_bits(&ctx->gb, 8);
  385.  
  386.     if (band_flags & 1) {
  387.         band->is_empty = 1;
  388.         return 0;
  389.     }
  390.  
  391.     band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
  392.  
  393.     band->inherit_mv     = band_flags & 2;
  394.     band->inherit_qdelta = band_flags & 8;
  395.     band->qdelta_present = band_flags & 4;
  396.     if (!band->qdelta_present) band->inherit_qdelta = 1;
  397.  
  398.     /* decode rvmap probability corrections if any */
  399.     band->num_corr = 0; /* there are no corrections */
  400.     if (band_flags & 0x10) {
  401.         band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
  402.         if (band->num_corr > 61) {
  403.             av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
  404.                    band->num_corr);
  405.             return AVERROR_INVALIDDATA;
  406.         }
  407.  
  408.         /* read correction pairs */
  409.         for (i = 0; i < band->num_corr * 2; i++)
  410.             band->corr[i] = get_bits(&ctx->gb, 8);
  411.     }
  412.  
  413.     /* select appropriate rvmap table for this band */
  414.     band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
  415.  
  416.     /* decode block huffman codebook */
  417.     ret = ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF,
  418.                                &band->blk_vlc, avctx);
  419.     if (ret < 0)
  420.         return ret;
  421.  
  422.     band->checksum_present = get_bits1(&ctx->gb);
  423.     if (band->checksum_present)
  424.         band->checksum = get_bits(&ctx->gb, 16);
  425.  
  426.     band->glob_quant = get_bits(&ctx->gb, 5);
  427.  
  428.     /* skip unknown extension if any */
  429.     if (band_flags & 0x20) { /* XXX: untested */
  430.         align_get_bits(&ctx->gb);
  431.         skip_hdr_extension(&ctx->gb);
  432.     }
  433.  
  434.     align_get_bits(&ctx->gb);
  435.  
  436.     return 0;
  437. }
  438.  
  439.  
  440. /**
  441.  *  Decode info (block type, cbp, quant delta, motion vector)
  442.  *  for all macroblocks in the current tile.
  443.  *
  444.  *  @param[in,out]  ctx    ptr to the decoder context
  445.  *  @param[in,out]  band   ptr to the band descriptor
  446.  *  @param[in,out]  tile   ptr to the tile descriptor
  447.  *  @param[in]      avctx  ptr to the AVCodecContext
  448.  *  @return         result code: 0 = OK, -1 = error
  449.  */
  450. static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
  451.                           IVITile *tile, AVCodecContext *avctx)
  452. {
  453.     int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
  454.                 mv_scale, blks_per_mb, s;
  455.     IVIMbInfo   *mb, *ref_mb;
  456.     int         row_offset = band->mb_size * band->pitch;
  457.  
  458.     mb     = tile->mbs;
  459.     ref_mb = tile->ref_mbs;
  460.     offs   = tile->ypos * band->pitch + tile->xpos;
  461.  
  462.     if (!ref_mb &&
  463.         ((band->qdelta_present && band->inherit_qdelta) || band->inherit_mv))
  464.         return AVERROR_INVALIDDATA;
  465.  
  466.     if (tile->num_MBs != IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size)) {
  467.         av_log(avctx, AV_LOG_ERROR, "Allocated tile size %d mismatches parameters %d\n",
  468.                tile->num_MBs, IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size));
  469.         return AVERROR_INVALIDDATA;
  470.     }
  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->frame_flags & 8)) {
  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 && ref_mb){
  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 && ref_mb) {
  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_bits1(&ctx->gb);
  517.                 }
  518.  
  519.                 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
  520.                 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
  521.  
  522.                 mb->q_delta = 0;
  523.                 if (band->qdelta_present) {
  524.                     if (band->inherit_qdelta) {
  525.                         if (ref_mb) mb->q_delta = ref_mb->q_delta;
  526.                     } else if (mb->cbp || (!band->plane && !band->band_num &&
  527.                                            (ctx->frame_flags & 8))) {
  528.                         mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
  529.                                                IVI_VLC_BITS, 1);
  530.                         mb->q_delta = IVI_TOSIGNED(mb->q_delta);
  531.                     }
  532.                 }
  533.  
  534.                 if (!mb->type) {
  535.                     mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
  536.                 } else {
  537.                     if (band->inherit_mv && ref_mb){
  538.                         /* motion vector inheritance */
  539.                         if (mv_scale) {
  540.                             mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
  541.                             mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
  542.                         } else {
  543.                             mb->mv_x = ref_mb->mv_x;
  544.                             mb->mv_y = ref_mb->mv_y;
  545.                         }
  546.                     } else {
  547.                         /* decode motion vector deltas */
  548.                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
  549.                                             IVI_VLC_BITS, 1);
  550.                         mv_y += IVI_TOSIGNED(mv_delta);
  551.                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
  552.                                             IVI_VLC_BITS, 1);
  553.                         mv_x += IVI_TOSIGNED(mv_delta);
  554.                         mb->mv_x = mv_x;
  555.                         mb->mv_y = mv_y;
  556.                     }
  557.                 }
  558.             }
  559.  
  560.             s= band->is_halfpel;
  561.             if (mb->type)
  562.             if ( x +  (mb->mv_x   >>s) +                 (y+               (mb->mv_y   >>s))*band->pitch < 0 ||
  563.                  x + ((mb->mv_x+s)>>s) + band->mb_size - 1
  564.                    + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize - 1) {
  565.                 av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
  566.                 return AVERROR_INVALIDDATA;
  567.             }
  568.  
  569.             mb++;
  570.             if (ref_mb)
  571.                 ref_mb++;
  572.             mb_offset += band->mb_size;
  573.         }
  574.  
  575.         offs += row_offset;
  576.     }
  577.  
  578.     align_get_bits(&ctx->gb);
  579.  
  580.     return 0;
  581. }
  582.  
  583.  
  584. /**
  585.  *  Switch buffers.
  586.  *
  587.  *  @param[in,out] ctx  ptr to the decoder context
  588.  */
  589. static void switch_buffers(IVI45DecContext *ctx)
  590. {
  591.     switch (ctx->prev_frame_type) {
  592.     case FRAMETYPE_INTRA:
  593.     case FRAMETYPE_INTER:
  594.         ctx->buf_switch ^= 1;
  595.         ctx->dst_buf = ctx->buf_switch;
  596.         ctx->ref_buf = ctx->buf_switch ^ 1;
  597.         break;
  598.     case FRAMETYPE_INTER_SCAL:
  599.         if (!ctx->inter_scal) {
  600.             ctx->ref2_buf   = 2;
  601.             ctx->inter_scal = 1;
  602.         }
  603.         FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);
  604.         ctx->ref_buf = ctx->ref2_buf;
  605.         break;
  606.     case FRAMETYPE_INTER_NOREF:
  607.         break;
  608.     }
  609.  
  610.     switch (ctx->frame_type) {
  611.     case FRAMETYPE_INTRA:
  612.         ctx->buf_switch = 0;
  613.         /* FALLTHROUGH */
  614.     case FRAMETYPE_INTER:
  615.         ctx->inter_scal = 0;
  616.         ctx->dst_buf = ctx->buf_switch;
  617.         ctx->ref_buf = ctx->buf_switch ^ 1;
  618.         break;
  619.     case FRAMETYPE_INTER_SCAL:
  620.     case FRAMETYPE_INTER_NOREF:
  621.     case FRAMETYPE_NULL:
  622.         break;
  623.     }
  624. }
  625.  
  626.  
  627. static int is_nonnull_frame(IVI45DecContext *ctx)
  628. {
  629.     return ctx->frame_type != FRAMETYPE_NULL;
  630. }
  631.  
  632.  
  633. /**
  634.  *  Initialize Indeo5 decoder.
  635.  */
  636. static av_cold int decode_init(AVCodecContext *avctx)
  637. {
  638.     IVI45DecContext  *ctx = avctx->priv_data;
  639.     int             result;
  640.  
  641.     ff_ivi_init_static_vlc();
  642.  
  643.     /* copy rvmap tables in our context so we can apply changes to them */
  644.     memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
  645.  
  646.     /* set the initial picture layout according to the basic profile:
  647.        there is only one band per plane (no scalability), only one tile (no local decoding)
  648.        and picture format = YVU9 */
  649.     ctx->pic_conf.pic_width     = avctx->width;
  650.     ctx->pic_conf.pic_height    = avctx->height;
  651.     ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
  652.     ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
  653.     ctx->pic_conf.tile_width    = avctx->width;
  654.     ctx->pic_conf.tile_height   = avctx->height;
  655.     ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
  656.  
  657.     result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
  658.     if (result) {
  659.         av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
  660.         return AVERROR_INVALIDDATA;
  661.     }
  662.  
  663.     ctx->buf_switch = 0;
  664.     ctx->inter_scal = 0;
  665.  
  666.     ctx->decode_pic_hdr   = decode_pic_hdr;
  667.     ctx->decode_band_hdr  = decode_band_hdr;
  668.     ctx->decode_mb_info   = decode_mb_info;
  669.     ctx->switch_buffers   = switch_buffers;
  670.     ctx->is_nonnull_frame = is_nonnull_frame;
  671.  
  672.     avctx->pix_fmt = AV_PIX_FMT_YUV410P;
  673.  
  674.     return 0;
  675. }
  676.  
  677. AVCodec ff_indeo5_decoder = {
  678.     .name           = "indeo5",
  679.     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
  680.     .type           = AVMEDIA_TYPE_VIDEO,
  681.     .id             = AV_CODEC_ID_INDEO5,
  682.     .priv_data_size = sizeof(IVI45DecContext),
  683.     .init           = decode_init,
  684.     .close          = ff_ivi_decode_close,
  685.     .decode         = ff_ivi_decode_frame,
  686.     .capabilities   = CODEC_CAP_DR1,
  687. };
  688.