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FFmpeg/libavcodec/indeo4.c

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  1. /*

  2.  * Indeo Video Interactive v4 compatible decoder

  3.  * Copyright (c) 2009-2011 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 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 "ivi_dsp.h"

  34. #include "ivi_common.h"

  35. #include "indeo4data.h"

  36. 

  37. /**

  38.  *  Indeo 4 frame types.

  39.  */

  40. enum {

  41.     FRAMETYPE_INTRA       = 0,

  42.     FRAMETYPE_INTRA1      = 1,  ///< intra frame with slightly different bitstream coding

  43.     FRAMETYPE_INTER       = 2,  ///< non-droppable P-frame

  44.     FRAMETYPE_BIDIR       = 3,  ///< bidirectional frame

  45.     FRAMETYPE_INTER_NOREF = 4,  ///< droppable P-frame

  46.     FRAMETYPE_NULL_FIRST  = 5,  ///< empty frame with no data

  47.     FRAMETYPE_NULL_LAST   = 6   ///< empty frame with no data

  48. };

  49. 

  50. #define IVI4_PIC_SIZE_ESC   7

  51. 

  52. 

  53. static const struct {

  54.     InvTransformPtr *inv_trans;

  55.     DCTransformPtr  *dc_trans;

  56.     int             is_2d_trans;

  57. } transforms[18] = {

  58.     { ff_ivi_inverse_haar_8x8,  ff_ivi_dc_haar_2d,       1 },

  59.     { ff_ivi_row_haar8,         ff_ivi_dc_haar_2d,       0 },

  60.     { ff_ivi_col_haar8,         ff_ivi_dc_haar_2d,       0 },

  61.     { ff_ivi_put_pixels_8x8,    ff_ivi_put_dc_pixel_8x8, 1 },

  62.     { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d,      1 },

  63.     { ff_ivi_row_slant8,        ff_ivi_dc_row_slant,     1 },

  64.     { ff_ivi_col_slant8,        ff_ivi_dc_col_slant,     1 },

  65.     { NULL, NULL, 0 }, /* inverse DCT 8x8 */

  66.     { NULL, NULL, 0 }, /* inverse DCT 8x1 */

  67.     { NULL, NULL, 0 }, /* inverse DCT 1x8 */

  68.     { ff_ivi_inverse_haar_4x4,  ff_ivi_dc_haar_2d,       1 },

  69.     { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d,      1 },

  70.     { NULL, NULL, 0 }, /* no transform 4x4 */

  71.     { ff_ivi_row_haar4,         ff_ivi_dc_haar_2d,       0 },

  72.     { ff_ivi_col_haar4,         ff_ivi_dc_haar_2d,       0 },

  73.     { ff_ivi_row_slant4,        ff_ivi_dc_row_slant,     0 },

  74.     { ff_ivi_col_slant4,        ff_ivi_dc_col_slant,     0 },

  75.     { NULL, NULL, 0 }, /* inverse DCT 4x4 */

  76. };

  77. 

  78. /**

  79.  *  Decode subdivision of a plane.

  80.  *  This is a simplified version that checks for two supported subdivisions:

  81.  *  - 1 wavelet band  per plane, size factor 1:1, code pattern: 3

  82.  *  - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3

  83.  *  Anything else is either unsupported or corrupt.

  84.  *

  85.  *  @param[in,out] gb    the GetBit context

  86.  *  @return        number of wavelet bands or 0 on error

  87.  */

  88. static int decode_plane_subdivision(GetBitContext *gb)

  89. {

  90.     int i;

  91. 

  92.     switch (get_bits(gb, 2)) {

  93.     case 3:

  94.         return 1;

  95.     case 2:

  96.         for (i = 0; i < 4; i++)

  97.             if (get_bits(gb, 2) != 3)

  98.                 return 0;

  99.         return 4;

  100.     default:

  101.         return 0;

  102.     }

  103. }

  104. 

  105. static inline int scale_tile_size(int def_size, int size_factor)

  106. {

  107.     return size_factor == 15 ? def_size : (size_factor + 1) << 5;

  108. }

  109. 

  110. /**

  111.  *  Decode Indeo 4 picture header.

  112.  *

  113.  *  @param[in,out] ctx       pointer to the decoder context

  114.  *  @param[in]     avctx     pointer to the AVCodecContext

  115.  *  @return        result code: 0 = OK, negative number = error

  116.  */

  117. static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)

  118. {

  119.     int             pic_size_indx, i, p;

  120.     IVIPicConfig    pic_conf;

  121. 

  122.     if (get_bits(&ctx->gb, 18) != 0x3FFF8) {

  123.         av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");

  124.         return AVERROR_INVALIDDATA;

  125.     }

  126. 

  127.     ctx->prev_frame_type = ctx->frame_type;

  128.     ctx->frame_type      = get_bits(&ctx->gb, 3);

  129.     if (ctx->frame_type == 7) {

  130.         av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);

  131.         return AVERROR_INVALIDDATA;

  132.     }

  133. 

  134. #if IVI4_STREAM_ANALYSER

  135.     if (ctx->frame_type == FRAMETYPE_BIDIR)

  136.         ctx->has_b_frames = 1;

  137. #endif

  138. 

  139.     ctx->transp_status = get_bits1(&ctx->gb);

  140. #if IVI4_STREAM_ANALYSER

  141.     if (ctx->transp_status) {

  142.         ctx->has_transp = 1;

  143.     }

  144. #endif

  145. 

  146.     /* unknown bit: Mac decoder ignores this bit, XANIM returns error */

  147.     if (get_bits1(&ctx->gb)) {

  148.         av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");

  149.         return AVERROR_INVALIDDATA;

  150.     }

  151. 

  152.     ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;

  153. 

  154.     /* null frames don't contain anything else so we just return */

  155.     if (ctx->frame_type >= FRAMETYPE_NULL_FIRST) {

  156.         av_dlog(avctx, "Null frame encountered!\n");

  157.         return 0;

  158.     }

  159. 

  160.     /* Check key lock status. If enabled - ignore lock word.         */

  161.     /* Usually we have to prompt the user for the password, but      */

  162.     /* we don't do that because Indeo 4 videos can be decoded anyway */

  163.     if (get_bits1(&ctx->gb)) {

  164.         skip_bits_long(&ctx->gb, 32);

  165.         av_dlog(avctx, "Password-protected clip!\n");

  166.     }

  167. 

  168.     pic_size_indx = get_bits(&ctx->gb, 3);

  169.     if (pic_size_indx == IVI4_PIC_SIZE_ESC) {

  170.         pic_conf.pic_height = get_bits(&ctx->gb, 16);

  171.         pic_conf.pic_width  = get_bits(&ctx->gb, 16);

  172.     } else {

  173.         pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];

  174.         pic_conf.pic_width  = ivi4_common_pic_sizes[pic_size_indx * 2    ];

  175.     }

  176. 

  177.     /* Decode tile dimensions. */

  178.     if (get_bits1(&ctx->gb)) {

  179.         pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));

  180.         pic_conf.tile_width  = scale_tile_size(pic_conf.pic_width,  get_bits(&ctx->gb, 4));

  181. #if IVI4_STREAM_ANALYSER

  182.         ctx->uses_tiling = 1;

  183. #endif

  184.     } else {

  185.         pic_conf.tile_height = pic_conf.pic_height;

  186.         pic_conf.tile_width  = pic_conf.pic_width;

  187.     }

  188. 

  189.     /* Decode chroma subsampling. We support only 4:4 aka YVU9. */

  190.     if (get_bits(&ctx->gb, 2)) {

  191.         av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");

  192.         return AVERROR_INVALIDDATA;

  193.     }

  194.     pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;

  195.     pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;

  196. 

  197.     /* decode subdivision of the planes */

  198.     pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);

  199.     pic_conf.chroma_bands = 0;

  200.     if (pic_conf.luma_bands)

  201.         pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);

  202.     ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;

  203.     if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {

  204.         av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",

  205.                pic_conf.luma_bands, pic_conf.chroma_bands);

  206.         return AVERROR_INVALIDDATA;

  207.     }

  208. 

  209.     /* check if picture layout was changed and reallocate buffers */

  210.     if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {

  211.         if (ff_ivi_init_planes(ctx->planes, &pic_conf)) {

  212.             av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");

  213.             ctx->pic_conf.luma_bands = 0;

  214.             return AVERROR(ENOMEM);

  215.         }

  216. 

  217.         ctx->pic_conf = pic_conf;

  218. 

  219.         /* set default macroblock/block dimensions */

  220.         for (p = 0; p <= 2; p++) {

  221.             for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {

  222.                 ctx->planes[p].bands[i].mb_size  = !p ? (!ctx->is_scalable ? 16 : 8) : 4;

  223.                 ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;

  224.             }

  225.         }

  226. 

  227.         if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width,

  228.                               ctx->pic_conf.tile_height)) {

  229.             av_log(avctx, AV_LOG_ERROR,

  230.                    "Couldn't reallocate internal structures!\n");

  231.             return AVERROR(ENOMEM);

  232.         }

  233.     }

  234. 

  235.     ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;

  236. 

  237.     /* skip decTimeEst field if present */

  238.     if (get_bits1(&ctx->gb))

  239.         skip_bits(&ctx->gb, 8);

  240. 

  241.     /* decode macroblock and block huffman codebooks */

  242.     if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF,  &ctx->mb_vlc,  avctx) ||

  243.         ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))

  244.         return AVERROR_INVALIDDATA;

  245. 

  246.     ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;

  247. 

  248.     ctx->in_imf = get_bits1(&ctx->gb);

  249.     ctx->in_q   = get_bits1(&ctx->gb);

  250. 

  251.     ctx->pic_glob_quant = get_bits(&ctx->gb, 5);

  252. 

  253.     /* TODO: ignore this parameter if unused */

  254.     ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;

  255. 

  256.     ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;

  257. 

  258.     /* skip picture header extension if any */

  259.     while (get_bits1(&ctx->gb)) {

  260.         av_dlog(avctx, "Pic hdr extension encountered!\n");

  261.         skip_bits(&ctx->gb, 8);

  262.     }

  263. 

  264.     if (get_bits1(&ctx->gb)) {

  265.         av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");

  266.     }

  267. 

  268.     align_get_bits(&ctx->gb);

  269. 

  270.     return 0;

  271. }

  272. 

  273. 

  274. /**

  275.  *  Decode Indeo 4 band header.

  276.  *

  277.  *  @param[in,out] ctx       pointer to the decoder context

  278.  *  @param[in,out] band      pointer to the band descriptor

  279.  *  @param[in]     avctx     pointer to the AVCodecContext

  280.  *  @return        result code: 0 = OK, negative number = error

  281.  */

  282. static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,

  283.                            AVCodecContext *avctx)

  284. {

  285.     int plane, band_num, indx, transform_id, scan_indx;

  286.     int i;

  287. 

  288.     plane    = get_bits(&ctx->gb, 2);

  289.     band_num = get_bits(&ctx->gb, 4);

  290.     if (band->plane != plane || band->band_num != band_num) {

  291.         av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");

  292.         return AVERROR_INVALIDDATA;

  293.     }

  294. 

  295.     band->is_empty = get_bits1(&ctx->gb);

  296.     if (!band->is_empty) {

  297.         int old_blk_size = band->blk_size;

  298.         /* skip header size

  299.          * If header size is not given, header size is 4 bytes. */

  300.         if (get_bits1(&ctx->gb))

  301.             skip_bits(&ctx->gb, 16);

  302. 

  303.         band->is_halfpel = get_bits(&ctx->gb, 2);

  304.         if (band->is_halfpel >= 2) {

  305.             av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",

  306.                    band->is_halfpel);

  307.             return AVERROR_INVALIDDATA;

  308.         }

  309. #if IVI4_STREAM_ANALYSER

  310.         if (!band->is_halfpel)

  311.             ctx->uses_fullpel = 1;

  312. #endif

  313. 

  314.         band->checksum_present = get_bits1(&ctx->gb);

  315.         if (band->checksum_present)

  316.             band->checksum = get_bits(&ctx->gb, 16);

  317. 

  318.         indx = get_bits(&ctx->gb, 2);

  319.         if (indx == 3) {

  320.             av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");

  321.             return AVERROR_INVALIDDATA;

  322.         }

  323.         band->mb_size  = 16 >> indx;

  324.         band->blk_size = 8 >> (indx >> 1);

  325. 

  326.         band->inherit_mv     = get_bits1(&ctx->gb);

  327.         band->inherit_qdelta = get_bits1(&ctx->gb);

  328. 

  329.         band->glob_quant = get_bits(&ctx->gb, 5);

  330. 

  331.         if (!get_bits1(&ctx->gb) || ctx->frame_type == FRAMETYPE_INTRA) {

  332.             transform_id = get_bits(&ctx->gb, 5);

  333.             if (transform_id >= FF_ARRAY_ELEMS(transforms) ||

  334.                 !transforms[transform_id].inv_trans) {

  335.                 avpriv_request_sample(avctx, "Transform %d", transform_id);

  336.                 return AVERROR_PATCHWELCOME;

  337.             }

  338.             if ((transform_id >= 7 && transform_id <= 9) ||

  339.                  transform_id == 17) {

  340.                 avpriv_request_sample(avctx, "DCT transform");

  341.                 return AVERROR_PATCHWELCOME;

  342.             }

  343. 

  344.             if (transform_id < 10 && band->blk_size < 8) {

  345.                 av_log(avctx, AV_LOG_ERROR, "wrong transform size!\n");

  346.                 return AVERROR_INVALIDDATA;

  347.             }

  348. #if IVI4_STREAM_ANALYSER

  349.             if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)

  350.                 ctx->uses_haar = 1;

  351. #endif

  352. 

  353.             band->inv_transform = transforms[transform_id].inv_trans;

  354.             band->dc_transform  = transforms[transform_id].dc_trans;

  355.             band->is_2d_trans   = transforms[transform_id].is_2d_trans;

  356. 

  357.             if (transform_id < 10)

  358.                 band->transform_size = 8;

  359.             else

  360.                 band->transform_size = 4;

  361. 

  362.             if (band->blk_size != band->transform_size) {

  363.                 av_log(avctx, AV_LOG_ERROR, "transform and block size mismatch (%d != %d)\n", band->transform_size, band->blk_size);

  364.                 return AVERROR_INVALIDDATA;

  365.             }

  366. 

  367.             scan_indx = get_bits(&ctx->gb, 4);

  368.             if (scan_indx == 15) {

  369.                 av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");

  370.                 return AVERROR_INVALIDDATA;

  371.             }

  372.             if (scan_indx > 4 && scan_indx < 10) {

  373.                 if (band->blk_size != 4) {

  374.                     av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");

  375.                     return AVERROR_INVALIDDATA;

  376.                 }

  377.             } else if (band->blk_size != 8) {

  378.                 av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");

  379.                 return AVERROR_INVALIDDATA;

  380.             }

  381. 

  382.             band->scan = scan_index_to_tab[scan_indx];

  383.             band->scan_size = band->blk_size;

  384. 

  385.             band->quant_mat = get_bits(&ctx->gb, 5);

  386.             if (band->quant_mat >= FF_ARRAY_ELEMS(quant_index_to_tab)) {

  387. 

  388.                 if (band->quant_mat == 31)

  389.                     av_log(avctx, AV_LOG_ERROR,

  390.                            "Custom quant matrix encountered!\n");

  391.                 else

  392.                     avpriv_request_sample(avctx, "Quantization matrix %d",

  393.                                           band->quant_mat);

  394.                 band->quant_mat = -1;

  395.                 return AVERROR_INVALIDDATA;

  396.             }

  397.         } else {

  398.             if (old_blk_size != band->blk_size) {

  399.                 av_log(avctx, AV_LOG_ERROR,

  400.                        "The band block size does not match the configuration "

  401.                        "inherited\n");

  402.                 return AVERROR_INVALIDDATA;

  403.             }

  404.             if (band->quant_mat < 0) {

  405.                 av_log(avctx, AV_LOG_ERROR, "Invalid quant_mat inherited\n");

  406.                 return AVERROR_INVALIDDATA;

  407.             }

  408.         }

  409.         if (quant_index_to_tab[band->quant_mat] > 4 && band->blk_size == 4) {

  410.             av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix for 4x4 block encountered!\n");

  411.             band->quant_mat = 0;

  412.             return AVERROR_INVALIDDATA;

  413.         }

  414.         if (band->scan_size != band->blk_size) {

  415.             av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");

  416.             return AVERROR_INVALIDDATA;

  417.         }

  418.         if (band->transform_size == 8 && band->blk_size < 8) {

  419.             av_log(avctx, AV_LOG_ERROR, "mismatching transform_size!\n");

  420.             return AVERROR_INVALIDDATA;

  421.         }

  422. 

  423.         /* decode block huffman codebook */

  424.         if (!get_bits1(&ctx->gb))

  425.             band->blk_vlc.tab = ctx->blk_vlc.tab;

  426.         else

  427.             if (ff_ivi_dec_huff_desc(&ctx->gb, 1, IVI_BLK_HUFF,

  428.                                      &band->blk_vlc, avctx))

  429.                 return AVERROR_INVALIDDATA;

  430. 

  431.         /* select appropriate rvmap table for this band */

  432.         band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;

  433. 

  434.         /* decode rvmap probability corrections if any */

  435.         band->num_corr = 0; /* there is no corrections */

  436.         if (get_bits1(&ctx->gb)) {

  437.             band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */

  438.             if (band->num_corr > 61) {

  439.                 av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",

  440.                        band->num_corr);

  441.                 return AVERROR_INVALIDDATA;

  442.             }

  443. 

  444.             /* read correction pairs */

  445.             for (i = 0; i < band->num_corr * 2; i++)

  446.                 band->corr[i] = get_bits(&ctx->gb, 8);

  447.         }

  448.     }

  449. 

  450.     if (band->blk_size == 8) {

  451.         band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0];

  452.         band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];

  453.     } else {

  454.         band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0];

  455.         band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];

  456.     }

  457. 

  458.     /* Indeo 4 doesn't use scale tables */

  459.     band->intra_scale = NULL;

  460.     band->inter_scale = NULL;

  461. 

  462.     align_get_bits(&ctx->gb);

  463. 

  464.     if (!band->scan) {

  465.         av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");

  466.         return AVERROR_INVALIDDATA;

  467.     }

  468. 

  469.     return 0;

  470. }

  471. 

  472. 

  473. /**

  474.  *  Decode information (block type, cbp, quant delta, motion vector)

  475.  *  for all macroblocks in the current tile.

  476.  *

  477.  *  @param[in,out] ctx       pointer to the decoder context

  478.  *  @param[in,out] band      pointer to the band descriptor

  479.  *  @param[in,out] tile      pointer to the tile descriptor

  480.  *  @param[in]     avctx     pointer to the AVCodecContext

  481.  *  @return        result code: 0 = OK, negative number = error

  482.  */

  483. static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,

  484.                           IVITile *tile, AVCodecContext *avctx)

  485. {

  486.     int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,

  487.                 mv_scale, mb_type_bits, s;

  488.     IVIMbInfo   *mb, *ref_mb;

  489.     int         row_offset = band->mb_size * band->pitch;

  490. 

  491.     mb     = tile->mbs;

  492.     ref_mb = tile->ref_mbs;

  493.     offs   = tile->ypos * band->pitch + tile->xpos;

  494. 

  495.     blks_per_mb  = band->mb_size   != band->blk_size  ? 4 : 1;

  496.     mb_type_bits = ctx->frame_type == FRAMETYPE_BIDIR ? 2 : 1;

  497. 

  498.     /* scale factor for motion vectors */

  499.     mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);

  500.     mv_x = mv_y = 0;

  501. 

  502.     if (((tile->width + band->mb_size-1)/band->mb_size) * ((tile->height + band->mb_size-1)/band->mb_size) != tile->num_MBs) {

  503.         av_log(avctx, AV_LOG_ERROR, "num_MBs mismatch %d %d %d %d\n", tile->width, tile->height, band->mb_size, tile->num_MBs);

  504.         return -1;

  505.     }

  506. 

  507.     for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {

  508.         mb_offset = offs;

  509. 

  510.         for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {

  511.             mb->xpos     = x;

  512.             mb->ypos     = y;

  513.             mb->buf_offs = mb_offset;

  514. 

  515.             if (get_bits1(&ctx->gb)) {

  516.                 if (ctx->frame_type == FRAMETYPE_INTRA) {

  517.                     av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");

  518.                     return AVERROR_INVALIDDATA;

  519.                 }

  520.                 mb->type = 1; /* empty macroblocks are always INTER */

  521.                 mb->cbp  = 0; /* all blocks are empty */

  522. 

  523.                 mb->q_delta = 0;

  524.                 if (!band->plane && !band->band_num && ctx->in_q) {

  525.                     mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,

  526.                                            IVI_VLC_BITS, 1);

  527.                     mb->q_delta = IVI_TOSIGNED(mb->q_delta);

  528.                 }

  529. 

  530.                 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */

  531.                 if (band->inherit_mv && ref_mb) {

  532.                     /* motion vector inheritance */

  533.                     if (mv_scale) {

  534.                         mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);

  535.                         mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);

  536.                     } else {

  537.                         mb->mv_x = ref_mb->mv_x;

  538.                         mb->mv_y = ref_mb->mv_y;

  539.                     }

  540.                 }

  541.             } else {

  542.                 if (band->inherit_mv) {

  543.                     /* copy mb_type from corresponding reference mb */

  544.                     if (!ref_mb) {

  545.                         av_log(avctx, AV_LOG_ERROR, "ref_mb unavailable\n");

  546.                         return AVERROR_INVALIDDATA;

  547.                     }

  548.                     mb->type = ref_mb->type;

  549.                 } else if (ctx->frame_type == FRAMETYPE_INTRA ||

  550.                            ctx->frame_type == FRAMETYPE_INTRA1) {

  551.                     mb->type = 0; /* mb_type is always INTRA for intra-frames */

  552.                 } else {

  553.                     mb->type = get_bits(&ctx->gb, mb_type_bits);

  554.                 }

  555. 

  556.                 mb->cbp = get_bits(&ctx->gb, blks_per_mb);

  557. 

  558.                 mb->q_delta = 0;

  559.                 if (band->inherit_qdelta) {

  560.                     if (ref_mb) mb->q_delta = ref_mb->q_delta;

  561.                 } else if (mb->cbp || (!band->plane && !band->band_num &&

  562.                            ctx->in_q)) {

  563.                     mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,

  564.                                            IVI_VLC_BITS, 1);

  565.                     mb->q_delta = IVI_TOSIGNED(mb->q_delta);

  566.                 }

  567. 

  568.                 if (!mb->type) {

  569.                     mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */

  570.                 } else {

  571.                     if (band->inherit_mv) {

  572.                         if (ref_mb)

  573.                             /* motion vector inheritance */

  574.                             if (mv_scale) {

  575.                                 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);

  576.                                 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);

  577.                             } else {

  578.                                 mb->mv_x = ref_mb->mv_x;

  579.                                 mb->mv_y = ref_mb->mv_y;

  580.                             }

  581.                     } else {

  582.                         /* decode motion vector deltas */

  583.                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,

  584.                                             IVI_VLC_BITS, 1);

  585.                         mv_y += IVI_TOSIGNED(mv_delta);

  586.                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,

  587.                                             IVI_VLC_BITS, 1);

  588.                         mv_x += IVI_TOSIGNED(mv_delta);

  589.                         mb->mv_x = mv_x;

  590.                         mb->mv_y = mv_y;

  591.                     }

  592.                 }

  593.             }

  594. 

  595.             s= band->is_halfpel;

  596.             if (mb->type)

  597.             if ( x +  (mb->mv_x   >>s) +                 (y+               (mb->mv_y   >>s))*band->pitch < 0 ||

  598.                  x + ((mb->mv_x+s)>>s) + band->mb_size - 1

  599.                    + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize -1) {

  600.                 av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);

  601.                 return AVERROR_INVALIDDATA;

  602.             }

  603. 

  604.             mb++;

  605.             if (ref_mb)

  606.                 ref_mb++;

  607.             mb_offset += band->mb_size;

  608.         }

  609. 

  610.         offs += row_offset;

  611.     }

  612. 

  613.     align_get_bits(&ctx->gb);

  614. 

  615.     return 0;

  616. }

  617. 

  618. 

  619. /**

  620.  *  Rearrange decoding and reference buffers.

  621.  *

  622.  *  @param[in,out] ctx       pointer to the decoder context

  623.  */

  624. static void switch_buffers(IVI45DecContext *ctx)

  625. {

  626.     switch (ctx->prev_frame_type) {

  627.     case FRAMETYPE_INTRA:

  628.     case FRAMETYPE_INTRA1:

  629.     case FRAMETYPE_INTER:

  630.         ctx->buf_switch ^= 1;

  631.         ctx->dst_buf     = ctx->buf_switch;

  632.         ctx->ref_buf     = ctx->buf_switch ^ 1;

  633.         break;

  634.     case FRAMETYPE_INTER_NOREF:

  635.         break;

  636.     }

  637. 

  638.     switch (ctx->frame_type) {

  639.     case FRAMETYPE_INTRA:

  640.     case FRAMETYPE_INTRA1:

  641.         ctx->buf_switch = 0;

  642.         /* FALLTHROUGH */

  643.     case FRAMETYPE_INTER:

  644.         ctx->dst_buf = ctx->buf_switch;

  645.         ctx->ref_buf = ctx->buf_switch ^ 1;

  646.         break;

  647.     case FRAMETYPE_INTER_NOREF:

  648.     case FRAMETYPE_NULL_FIRST:

  649.     case FRAMETYPE_NULL_LAST:

  650.         break;

  651.     }

  652. }

  653. 

  654. 

  655. static int is_nonnull_frame(IVI45DecContext *ctx)

  656. {

  657.     return ctx->frame_type < FRAMETYPE_NULL_FIRST;

  658. }

  659. 

  660. 

  661. static av_cold int decode_init(AVCodecContext *avctx)

  662. {

  663.     IVI45DecContext *ctx = avctx->priv_data;

  664. 

  665.     ff_ivi_init_static_vlc();

  666. 

  667.     /* copy rvmap tables in our context so we can apply changes to them */

  668.     memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));

  669. 

  670.     /* Force allocation of the internal buffers */

  671.     /* during picture header decoding.          */

  672.     ctx->pic_conf.pic_width  = 0;

  673.     ctx->pic_conf.pic_height = 0;

  674. 

  675.     avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  676. 

  677.     ctx->decode_pic_hdr   = decode_pic_hdr;

  678.     ctx->decode_band_hdr  = decode_band_hdr;

  679.     ctx->decode_mb_info   = decode_mb_info;

  680.     ctx->switch_buffers   = switch_buffers;

  681.     ctx->is_nonnull_frame = is_nonnull_frame;

  682. 

  683.     return 0;

  684. }

  685. 

  686. 

  687. AVCodec ff_indeo4_decoder = {

  688.     .name           = "indeo4",

  689.     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),

  690.     .type           = AVMEDIA_TYPE_VIDEO,

  691.     .id             = AV_CODEC_ID_INDEO4,

  692.     .priv_data_size = sizeof(IVI45DecContext),

  693.     .init           = decode_init,

  694.     .close          = ff_ivi_decode_close,

  695.     .decode         = ff_ivi_decode_frame,

  696.     .capabilities   = CODEC_CAP_DR1,

  697. };