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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 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. static const 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, 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.         skip_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, indx, transform_id, scan_indx;

  329.     int i;

  330.     int quant_mat;

  331. 

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

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

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

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

  336.         return AVERROR_INVALIDDATA;

  337.     }

  338. 

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

  340.     if (!band->is_empty) {

  341.         /* skip header size

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

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

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

  345. 

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

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

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

  349.                    band->is_halfpel);

  350.             return AVERROR_INVALIDDATA;

  351.         }

  352. #if IVI4_STREAM_ANALYSER

  353.         if (!band->is_halfpel)

  354.             ctx->uses_fullpel = 1;

  355. #endif

  356. 

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

  358.         if (band->checksum_present)

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

  360. 

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

  362.         if (indx == 3) {

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

  364.             return AVERROR_INVALIDDATA;

  365.         }

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

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

  368. 

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

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

  371. 

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

  373. 

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

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

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

  377.                 !transforms[transform_id].inv_trans) {

  378.                 av_log_ask_for_sample(avctx, "Unimplemented transform: %d!\n", transform_id);

  379.                 return AVERROR_PATCHWELCOME;

  380.             }

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

  382.                  transform_id == 17) {

  383.                 av_log_ask_for_sample(avctx, "DCT transform not supported yet!\n");

  384.                 return AVERROR_PATCHWELCOME;

  385.             }

  386. 

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

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

  389.                 return AVERROR_INVALIDDATA;

  390.             }

  391. #if IVI4_STREAM_ANALYSER

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

  393.                 ctx->uses_haar = 1;

  394. #endif

  395. 

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

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

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

  399.             band->transform_size= (transform_id < 10) ? 8 : 4;

  400. 

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

  402.             if ((scan_indx>4 && scan_indx<10) != (band->blk_size==4)) {

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

  404.                 return AVERROR_INVALIDDATA;

  405.             }

  406.             if (scan_indx == 15) {

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

  408.                 return AVERROR_INVALIDDATA;

  409.             }

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

  411. 

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

  413.             if (quant_mat == 31) {

  414.                 av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");

  415.                 return AVERROR_INVALIDDATA;

  416.             }

  417.             if (quant_mat > 21) {

  418.                 av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix encountered!\n");

  419.                 return AVERROR_INVALIDDATA;

  420.             }

  421.             band->quant_mat = quant_mat;

  422.         }

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

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

  425.             band->quant_mat = 0;

  426.             return AVERROR_INVALIDDATA;

  427.         }

  428.         /* decode block huffman codebook */

  429.         if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF,

  430.                                  &band->blk_vlc, avctx))

  431.             return AVERROR_INVALIDDATA;

  432. 

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

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

  435. 

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

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

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

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

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

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

  442.                        band->num_corr);

  443.                 return AVERROR_INVALIDDATA;

  444.             }

  445. 

  446.             /* read correction pairs */

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

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

  449.         }

  450.     }

  451. 

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

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

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

  455.     } else {

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

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

  458.     }

  459. 

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

  461.     band->intra_scale = NULL;

  462.     band->inter_scale = NULL;

  463. 

  464.     align_get_bits(&ctx->gb);

  465. 

  466.     if (!band->scan) {

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

  468.         return AVERROR_INVALIDDATA;

  469.     }

  470. 

  471.     return 0;

  472. }

  473. 

  474. 

  475. /**

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

  477.  *  for all macroblocks in the current tile.

  478.  *

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

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

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

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

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

  484.  */

  485. static int decode_mb_info(IVI4DecContext *ctx, IVIBandDesc *band,

  486.                           IVITile *tile, AVCodecContext *avctx)

  487. {

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

  489.                 mv_scale, mb_type_bits, s;

  490.     IVIMbInfo   *mb, *ref_mb;

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

  492. 

  493.     mb     = tile->mbs;

  494.     ref_mb = tile->ref_mbs;

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

  496. 

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

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

  499. 

  500.     /* scale factor for motion vectors */

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

  502.     mv_x = mv_y = 0;

  503. 

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

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

  506.         return -1;

  507.     }

  508. 

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

  510.         mb_offset = offs;

  511. 

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

  513.             mb->xpos     = x;

  514.             mb->ypos     = y;

  515.             mb->buf_offs = mb_offset;

  516. 

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

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

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

  520.                     return AVERROR_INVALIDDATA;

  521.                 }

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

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

  524. 

  525.                 mb->q_delta = 0;

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

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

  528.                                            IVI_VLC_BITS, 1);

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

  530.                 }

  531. 

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

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

  534.                     /* motion vector inheritance */

  535.                     if (mv_scale) {

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

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

  538.                     } else {

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

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

  541.                     }

  542.                 }

  543.             } else {

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

  545.                     mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */

  546.                 } else if (ctx->frame_type == FRAMETYPE_INTRA) {

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

  548.                 } else {

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

  550.                 }

  551. 

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

  553. 

  554.                 mb->q_delta = 0;

  555.                 if (band->inherit_qdelta) {

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

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

  558.                            ctx->in_q)) {

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

  560.                                            IVI_VLC_BITS, 1);

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

  562.                 }

  563. 

  564.                 if (!mb->type) {

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

  566.                 } else {

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

  568.                         /* motion vector inheritance */

  569.                         if (mv_scale) {

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

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

  572.                         } else {

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

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

  575.                         }

  576.                     } else {

  577.                         /* decode motion vector deltas */

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

  579.                                             IVI_VLC_BITS, 1);

  580.                         mv_y += IVI_TOSIGNED(mv_delta);

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

  582.                                             IVI_VLC_BITS, 1);

  583.                         mv_x += IVI_TOSIGNED(mv_delta);

  584.                         mb->mv_x = mv_x;

  585.                         mb->mv_y = mv_y;

  586.                     }

  587.                 }

  588.             }

  589. 

  590.             s= band->is_halfpel;

  591.             if (mb->type)

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

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

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

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

  596.                 return AVERROR_INVALIDDATA;

  597.             }

  598. 

  599.             mb++;

  600.             if (ref_mb)

  601.                 ref_mb++;

  602.             mb_offset += band->mb_size;

  603.         }

  604. 

  605.         offs += row_offset;

  606.     }

  607. 

  608.     align_get_bits(&ctx->gb);

  609. 

  610.     return 0;

  611. }

  612. 

  613. 

  614. /**

  615.  *  Decode an Indeo 4 band.

  616.  *

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

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

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

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

  621.  */

  622. static int decode_band(IVI4DecContext *ctx, int plane_num,

  623.                        IVIBandDesc *band, AVCodecContext *avctx)

  624. {

  625.     int         result, i, t, pos, idx1, idx2;

  626.     IVITile     *tile;

  627.     int         ret = 0;

  628. 

  629.     band->buf     = band->bufs[ctx->dst_buf];

  630.     band->ref_buf = band->bufs[ctx->ref_buf];

  631. 

  632.     result = decode_band_hdr(ctx, band, avctx);

  633.     if (result) {

  634.         av_log(avctx, AV_LOG_ERROR, "Error decoding band header\n");

  635.         return result;

  636.     }

  637. 

  638.     if (band->is_empty) {

  639.         av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");

  640.         return AVERROR_INVALIDDATA;

  641.     }

  642. 

  643.     band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];

  644. 

  645.     /* apply corrections to the selected rvmap table if present */

  646.     for (i = 0; i < band->num_corr; i++) {

  647.         idx1 = band->corr[i * 2];

  648.         idx2 = band->corr[i * 2 + 1];

  649.         FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);

  650.         FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);

  651.         if (idx1 == band->rv_map->eob_sym || idx2 == band->rv_map->eob_sym)

  652.             band->rv_map->eob_sym ^= idx1 ^ idx2;

  653.         if (idx1 == band->rv_map->esc_sym || idx2 == band->rv_map->esc_sym)

  654.             band->rv_map->esc_sym ^= idx1 ^ idx2;

  655.     }

  656. 

  657.     pos = get_bits_count(&ctx->gb);

  658. 

  659.     for (t = 0; t < band->num_tiles; t++) {

  660.         tile = &band->tiles[t];

  661. 

  662.         tile->is_empty = get_bits1(&ctx->gb);

  663.         if (tile->is_empty) {

  664.             ff_ivi_process_empty_tile(avctx, band, tile,

  665.                                       (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));

  666.             av_dlog(avctx, "Empty tile encountered!\n");

  667.         } else {

  668.             tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);

  669.             if (!tile->data_size) {

  670.                 av_log(avctx, AV_LOG_ERROR, "Tile data size is zero!\n");

  671.                 ret = AVERROR_INVALIDDATA;

  672.                 break;

  673.             }

  674. 

  675.             result = decode_mb_info(ctx, band, tile, avctx);

  676.             if (result < 0)

  677.                 break;

  678. 

  679.             result = ff_ivi_decode_blocks(&ctx->gb, band, tile);

  680.             if (result < 0 || ((get_bits_count(&ctx->gb) - pos) >> 3) != tile->data_size) {

  681.                 av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n");

  682.                 break;

  683.             }

  684. 

  685.             pos += tile->data_size << 3; // skip to next tile

  686.         }

  687.     }

  688. 

  689.     /* restore the selected rvmap table by applying its corrections in reverse order */

  690.     for (i = band->num_corr - 1; i >= 0; i--) {

  691.         idx1 = band->corr[i * 2];

  692.         idx2 = band->corr[i * 2 + 1];

  693.         FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);

  694.         FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);

  695.         if (idx1 == band->rv_map->eob_sym || idx2 == band->rv_map->eob_sym)

  696.             band->rv_map->eob_sym ^= idx1 ^ idx2;

  697.         if (idx1 == band->rv_map->esc_sym || idx2 == band->rv_map->esc_sym)

  698.             band->rv_map->esc_sym ^= idx1 ^ idx2;

  699.     }

  700. 

  701. #if defined(DEBUG) && IVI4_DEBUG_CHECKSUM

  702.     if (band->checksum_present) {

  703.         uint16_t chksum = ivi_calc_band_checksum(band);

  704.         if (chksum != band->checksum) {

  705.             av_log(avctx, AV_LOG_ERROR,

  706.                    "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",

  707.                    band->plane, band->band_num, band->checksum, chksum);

  708.         }

  709.     }

  710. #endif

  711. 

  712.     align_get_bits(&ctx->gb);

  713. 

  714.     return ret;

  715. }

  716. 

  717. 

  718. static av_cold int decode_init(AVCodecContext *avctx)

  719. {

  720.     IVI4DecContext *ctx = avctx->priv_data;

  721. 

  722.     ff_ivi_init_static_vlc();

  723. 

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

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

  726. 

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

  728.     /* during picture header decoding.          */

  729.     ctx->pic_conf.pic_width  = 0;

  730.     ctx->pic_conf.pic_height = 0;

  731. 

  732.     avctx->pix_fmt = PIX_FMT_YUV410P;

  733. 

  734.     return 0;

  735. }

  736. 

  737. 

  738. /**

  739.  *  Rearrange decoding and reference buffers.

  740.  *

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

  742.  */

  743. static void switch_buffers(IVI4DecContext *ctx)

  744. {

  745.     switch (ctx->prev_frame_type) {

  746.     case FRAMETYPE_INTRA:

  747.     case FRAMETYPE_INTER:

  748.         ctx->buf_switch ^= 1;

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

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

  751.         break;

  752.     case FRAMETYPE_INTER_NOREF:

  753.         break;

  754.     }

  755. 

  756.     switch (ctx->frame_type) {

  757.     case FRAMETYPE_INTRA:

  758.         ctx->buf_switch = 0;

  759.         /* FALLTHROUGH */

  760.     case FRAMETYPE_INTER:

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

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

  763.         break;

  764.     case FRAMETYPE_INTER_NOREF:

  765.     case FRAMETYPE_NULL_FIRST:

  766.     case FRAMETYPE_NULL_LAST:

  767.         break;

  768.     }

  769. }

  770. 

  771. 

  772. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,

  773.                         AVPacket *avpkt)

  774. {

  775.     IVI4DecContext  *ctx = avctx->priv_data;

  776.     const uint8_t   *buf = avpkt->data;

  777.     int             buf_size = avpkt->size;

  778.     int             result, p, b;

  779. 

  780.     init_get_bits(&ctx->gb, buf, buf_size * 8);

  781. 

  782.     result = decode_pic_hdr(ctx, avctx);

  783.     if (result) {

  784.         av_log(avctx, AV_LOG_ERROR, "Error decoding picture header\n");

  785.         return result;

  786.     }

  787. 

  788.     switch_buffers(ctx);

  789. 

  790.     if (ctx->frame_type < FRAMETYPE_NULL_FIRST) {

  791.         for (p = 0; p < 3; p++) {

  792.             for (b = 0; b < ctx->planes[p].num_bands; b++) {

  793.                 result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);

  794.                 if (result) {

  795.                     av_log(avctx, AV_LOG_ERROR,

  796.                            "Error decoding band: %d, plane: %d\n", b, p);

  797.                     return result;

  798.                 }

  799.             }

  800.         }

  801.     }

  802. 

  803.     /* If the bidirectional mode is enabled, next I and the following P frame will */

  804.     /* be sent together. Unfortunately the approach below seems to be the only way */

  805.     /* to handle the B-frames mode. That's exactly the same Intel decoders do.     */

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

  807.         while (get_bits(&ctx->gb, 8)); // skip version string

  808.         skip_bits_long(&ctx->gb, 64);  // skip padding, TODO: implement correct 8-bytes alignment

  809.         if (get_bits_left(&ctx->gb) > 18 && show_bits(&ctx->gb, 18) == 0x3FFF8)

  810.             av_log(avctx, AV_LOG_ERROR, "Buffer contains IP frames!\n");

  811.     }

  812. 

  813.     if (ctx->frame_type >= FRAMETYPE_NULL_FIRST)

  814.         return buf_size;

  815. 

  816.     if (ctx->frame.data[0])

  817.         avctx->release_buffer(avctx, &ctx->frame);

  818. 

  819.     avcodec_set_dimensions(avctx, ctx->planes[0].width, ctx->planes[0].height);

  820.     ctx->frame.reference = 0;

  821.     if ((result = avctx->get_buffer(avctx, &ctx->frame)) < 0) {

  822.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  823.         return result;

  824.     }

  825. 

  826.     if (ctx->is_scalable) {

  827.         ff_ivi_recompose_haar(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);

  828.     } else {

  829.         ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);

  830.     }

  831. 

  832.     ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);

  833.     ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);

  834. 

  835.     *data_size = sizeof(AVFrame);

  836.     *(AVFrame*)data = ctx->frame;

  837. 

  838.     return buf_size;

  839. }

  840. 

  841. 

  842. static av_cold int decode_close(AVCodecContext *avctx)

  843. {

  844.     IVI4DecContext *ctx = avctx->priv_data;

  845. 

  846.     ff_ivi_free_buffers(&ctx->planes[0]);

  847. 

  848.     if (ctx->frame.data[0])

  849.         avctx->release_buffer(avctx, &ctx->frame);

  850. 

  851. #if IVI4_STREAM_ANALYSER

  852.     if (ctx->is_scalable)

  853.         av_log(avctx, AV_LOG_ERROR, "This video uses scalability mode!\n");

  854.     if (ctx->uses_tiling)

  855.         av_log(avctx, AV_LOG_ERROR, "This video uses local decoding!\n");

  856.     if (ctx->has_b_frames)

  857.         av_log(avctx, AV_LOG_ERROR, "This video contains B-frames!\n");

  858.     if (ctx->has_transp)

  859.         av_log(avctx, AV_LOG_ERROR, "Transparency mode is enabled!\n");

  860.     if (ctx->uses_haar)

  861.         av_log(avctx, AV_LOG_ERROR, "This video uses Haar transform!\n");

  862.     if (ctx->uses_fullpel)

  863.         av_log(avctx, AV_LOG_ERROR, "This video uses fullpel motion vectors!\n");

  864. #endif

  865. 

  866.     return 0;

  867. }

  868. 

  869. 

  870. AVCodec ff_indeo4_decoder = {

  871.     .name           = "indeo4",

  872.     .type           = AVMEDIA_TYPE_VIDEO,

  873.     .id             = CODEC_ID_INDEO4,

  874.     .priv_data_size = sizeof(IVI4DecContext),

  875.     .init           = decode_init,

  876.     .close          = decode_close,

  877.     .decode         = decode_frame,

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

  879. };