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FFmpeg/libavcodec/indeo5.c

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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. #define IVI5_IS_PROTECTED       0x20

  52. 

  53. typedef struct {

  54.     GetBitContext   gb;

  55.     AVFrame         frame;

  56.     RVMapDesc       rvmap_tabs[9];   ///< local corrected copy of the static rvmap tables

  57.     IVIPlaneDesc    planes[3];       ///< color planes

  58.     const uint8_t   *frame_data;     ///< input frame data pointer

  59.     int             buf_switch;      ///< used to switch between three buffers

  60.     int             inter_scal;      ///< signals a sequence of scalable inter frames

  61.     int             dst_buf;         ///< buffer index for the currently decoded frame

  62.     int             ref_buf;         ///< inter frame reference buffer index

  63.     int             ref2_buf;        ///< temporal storage for switching buffers

  64.     uint32_t        frame_size;      ///< frame size in bytes

  65.     int             frame_type;

  66.     int             prev_frame_type; ///< frame type of the previous frame

  67.     int             frame_num;

  68.     uint32_t        pic_hdr_size;    ///< picture header size in bytes

  69.     uint8_t         frame_flags;

  70.     uint16_t        checksum;        ///< frame checksum

  71. 

  72.     IVIHuffTab      mb_vlc;          ///< vlc table for decoding macroblock data

  73. 

  74.     uint16_t        gop_hdr_size;

  75.     uint8_t         gop_flags;

  76.     int             is_scalable;

  77.     uint32_t        lock_word;

  78.     IVIPicConfig    pic_conf;

  79. 

  80.     int gop_invalid;

  81.     int buf_invalid[3];

  82. } IVI5DecContext;

  83. 

  84. 

  85. /**

  86.  *  Decode Indeo5 GOP (Group of pictures) header.

  87.  *  This header is present in key frames only.

  88.  *  It defines parameters for all frames in a GOP.

  89.  *

  90.  *  @param[in,out] ctx    ptr to the decoder context

  91.  *  @param[in]     avctx  ptr to the AVCodecContext

  92.  *  @return         result code: 0 = OK, -1 = error

  93.  */

  94. static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)

  95. {

  96.     int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size, is_scalable;

  97.     int             quant_mat, blk_size_changed = 0;

  98.     IVIBandDesc     *band, *band1, *band2;

  99.     IVIPicConfig    pic_conf;

  100. 

  101.     ctx->gop_flags = get_bits(&ctx->gb, 8);

  102. 

  103.     ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;

  104. 

  105.     if (ctx->gop_flags & IVI5_IS_PROTECTED)

  106.         ctx->lock_word = get_bits_long(&ctx->gb, 32);

  107. 

  108.     tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;

  109.     if (tile_size > 256) {

  110.         av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);

  111.         return -1;

  112.     }

  113. 

  114.     /* decode number of wavelet bands */

  115.     /* num_levels * 3 + 1 */

  116.     pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;

  117.     pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;

  118.     is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;

  119.     if (is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {

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

  121.                pic_conf.luma_bands, pic_conf.chroma_bands);

  122.         return -1;

  123.     }

  124. 

  125.     pic_size_indx = get_bits(&ctx->gb, 4);

  126.     if (pic_size_indx == IVI5_PIC_SIZE_ESC) {

  127.         pic_conf.pic_height = get_bits(&ctx->gb, 13);

  128.         pic_conf.pic_width  = get_bits(&ctx->gb, 13);

  129.     } else {

  130.         pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;

  131.         pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;

  132.     }

  133. 

  134.     if (ctx->gop_flags & 2) {

  135.         av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");

  136.         return -1;

  137.     }

  138. 

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

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

  141. 

  142.     if (!tile_size) {

  143.         pic_conf.tile_height = pic_conf.pic_height;

  144.         pic_conf.tile_width  = pic_conf.pic_width;

  145.     } else {

  146.         pic_conf.tile_height = pic_conf.tile_width = tile_size;

  147.     }

  148. 

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

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

  151.         result = ff_ivi_init_planes(ctx->planes, &pic_conf);

  152.         if (result) {

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

  154.             return -1;

  155.         }

  156.         ctx->pic_conf = pic_conf;

  157.         ctx->is_scalable = is_scalable;

  158.         blk_size_changed = 1; /* force reallocation of the internal structures */

  159.     }

  160. 

  161.     for (p = 0; p <= 1; p++) {

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

  163.             band = &ctx->planes[p].bands[i];

  164. 

  165.             band->is_halfpel = get_bits1(&ctx->gb);

  166. 

  167.             mb_size  = get_bits1(&ctx->gb);

  168.             blk_size = 8 >> get_bits1(&ctx->gb);

  169.             mb_size  = blk_size << !mb_size;

  170. 

  171.             if (p==0 && blk_size==4) {

  172.                 av_log(avctx, AV_LOG_ERROR, "4x4 luma blocks are unsupported!\n");

  173.                 return AVERROR_PATCHWELCOME;

  174.             }

  175. 

  176.             blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;

  177.             if (blk_size_changed) {

  178.                 band->mb_size  = mb_size;

  179.                 band->blk_size = blk_size;

  180.             }

  181. 

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

  183.                 av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");

  184.                 return -1;

  185.             }

  186. 

  187.             /* select transform function and scan pattern according to plane and band number */

  188.             switch ((p << 2) + i) {

  189.             case 0:

  190.                 band->inv_transform = ff_ivi_inverse_slant_8x8;

  191.                 band->dc_transform  = ff_ivi_dc_slant_2d;

  192.                 band->scan          = ff_zigzag_direct;

  193.                 band->transform_size= 8;

  194.                 break;

  195. 

  196.             case 1:

  197.                 band->inv_transform = ff_ivi_row_slant8;

  198.                 band->dc_transform  = ff_ivi_dc_row_slant;

  199.                 band->scan          = ff_ivi_vertical_scan_8x8;

  200.                 band->transform_size= 8;

  201.                 break;

  202. 

  203.             case 2:

  204.                 band->inv_transform = ff_ivi_col_slant8;

  205.                 band->dc_transform  = ff_ivi_dc_col_slant;

  206.                 band->scan          = ff_ivi_horizontal_scan_8x8;

  207.                 band->transform_size= 8;

  208.                 break;

  209. 

  210.             case 3:

  211.                 band->inv_transform = ff_ivi_put_pixels_8x8;

  212.                 band->dc_transform  = ff_ivi_put_dc_pixel_8x8;

  213.                 band->scan          = ff_ivi_horizontal_scan_8x8;

  214.                 band->transform_size= 8;

  215.                 break;

  216. 

  217.             case 4:

  218.                 band->inv_transform = ff_ivi_inverse_slant_4x4;

  219.                 band->dc_transform  = ff_ivi_dc_slant_2d;

  220.                 band->scan          = ff_ivi_direct_scan_4x4;

  221.                 band->transform_size= 4;

  222.                 break;

  223.             }

  224. 

  225.             band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||

  226.                                 band->inv_transform == ff_ivi_inverse_slant_4x4;

  227. 

  228.             /* select dequant matrix according to plane and band number */

  229.             if (!p) {

  230.                 quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;

  231.             } else {

  232.                 quant_mat = 5;

  233.             }

  234. 

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

  236.                 band->intra_base  = &ivi5_base_quant_8x8_intra[quant_mat][0];

  237.                 band->inter_base  = &ivi5_base_quant_8x8_inter[quant_mat][0];

  238.                 band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0];

  239.                 band->inter_scale = &ivi5_scale_quant_8x8_inter[quant_mat][0];

  240.             } else {

  241.                 band->intra_base  = ivi5_base_quant_4x4_intra;

  242.                 band->inter_base  = ivi5_base_quant_4x4_inter;

  243.                 band->intra_scale = ivi5_scale_quant_4x4_intra;

  244.                 band->inter_scale = ivi5_scale_quant_4x4_inter;

  245.             }

  246. 

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

  248.                 av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");

  249.                 return -1;

  250.             }

  251.         }

  252.     }

  253. 

  254.     /* copy chroma parameters into the 2nd chroma plane */

  255.     for (i = 0; i < pic_conf.chroma_bands; i++) {

  256.         band1 = &ctx->planes[1].bands[i];

  257.         band2 = &ctx->planes[2].bands[i];

  258. 

  259.         band2->width         = band1->width;

  260.         band2->height        = band1->height;

  261.         band2->mb_size       = band1->mb_size;

  262.         band2->blk_size      = band1->blk_size;

  263.         band2->is_halfpel    = band1->is_halfpel;

  264.         band2->intra_base    = band1->intra_base;

  265.         band2->inter_base    = band1->inter_base;

  266.         band2->intra_scale   = band1->intra_scale;

  267.         band2->inter_scale   = band1->inter_scale;

  268.         band2->scan          = band1->scan;

  269.         band2->inv_transform = band1->inv_transform;

  270.         band2->dc_transform  = band1->dc_transform;

  271.         band2->is_2d_trans   = band1->is_2d_trans;

  272.         band2->transform_size= band1->transform_size;

  273.     }

  274. 

  275.     /* reallocate internal structures if needed */

  276.     if (blk_size_changed) {

  277.         result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,

  278.                                    pic_conf.tile_height);

  279.         if (result) {

  280.             av_log(avctx, AV_LOG_ERROR,

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

  282.             return -1;

  283.         }

  284.     }

  285. 

  286.     if (ctx->gop_flags & 8) {

  287.         if (get_bits(&ctx->gb, 3)) {

  288.             av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");

  289.             return -1;

  290.         }

  291. 

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

  293.             skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */

  294.     }

  295. 

  296.     align_get_bits(&ctx->gb);

  297. 

  298.     skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */

  299. 

  300.     /* skip GOP extension if any */

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

  302.         do {

  303.             i = get_bits(&ctx->gb, 16);

  304.         } while (i & 0x8000);

  305.     }

  306. 

  307.     align_get_bits(&ctx->gb);

  308. 

  309.     return 0;

  310. }

  311. 

  312. 

  313. /**

  314.  *  Skip a header extension.

  315.  *

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

  317.  */

  318. static inline void skip_hdr_extension(GetBitContext *gb)

  319. {

  320.     int i, len;

  321. 

  322.     do {

  323.         len = get_bits(gb, 8);

  324.         for (i = 0; i < len; i++) skip_bits(gb, 8);

  325.     } while(len);

  326. }

  327. 

  328. 

  329. /**

  330.  *  Decode Indeo5 picture header.

  331.  *

  332.  *  @param[in,out]  ctx    ptr to the decoder context

  333.  *  @param[in]      avctx  ptr to the AVCodecContext

  334.  *  @return         result code: 0 = OK, -1 = error

  335.  */

  336. static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)

  337. {

  338.     if (get_bits(&ctx->gb, 5) != 0x1F) {

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

  340.         return -1;

  341.     }

  342. 

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

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

  345.     if (ctx->frame_type >= 5) {

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

  347.         return -1;

  348.     }

  349. 

  350.     ctx->frame_num = get_bits(&ctx->gb, 8);

  351. 

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

  353.         ctx->gop_invalid = 1;

  354.         if (decode_gop_header(ctx, avctx))

  355.             return -1;

  356.         ctx->gop_invalid = 0;

  357.     }

  358. 

  359.     if (ctx->frame_type == FRAMETYPE_INTER_SCAL && !ctx->is_scalable) {

  360.         av_log(avctx, AV_LOG_ERROR, "Scalable inter frame in non scaleable stream\n");

  361.         ctx->frame_type = FRAMETYPE_INTER;

  362.         return AVERROR_INVALIDDATA;

  363.     }

  364. 

  365.     if (ctx->frame_type != FRAMETYPE_NULL) {

  366.         ctx->frame_flags = get_bits(&ctx->gb, 8);

  367. 

  368.         ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;

  369. 

  370.         ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;

  371. 

  372.         /* skip unknown extension if any */

  373.         if (ctx->frame_flags & 0x20)

  374.             skip_hdr_extension(&ctx->gb); /* XXX: untested */

  375. 

  376.         /* decode macroblock huffman codebook */

  377.         if (ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40, IVI_MB_HUFF, &ctx->mb_vlc, avctx))

  378.             return -1;

  379. 

  380.         skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */

  381.     }

  382. 

  383.     align_get_bits(&ctx->gb);

  384. 

  385.     return 0;

  386. }

  387. 

  388. 

  389. /**

  390.  *  Decode Indeo5 band header.

  391.  *

  392.  *  @param[in,out]  ctx    ptr to the decoder context

  393.  *  @param[in,out]  band   ptr to the band descriptor

  394.  *  @param[in]      avctx  ptr to the AVCodecContext

  395.  *  @return         result code: 0 = OK, -1 = error

  396.  */

  397. static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,

  398.                            AVCodecContext *avctx)

  399. {

  400.     int         i;

  401.     uint8_t     band_flags;

  402. 

  403.     band_flags = get_bits(&ctx->gb, 8);

  404. 

  405.     if (band_flags & 1) {

  406.         band->is_empty = 1;

  407.         return 0;

  408.     }

  409. 

  410.     band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;

  411. 

  412.     band->inherit_mv     = band_flags & 2;

  413.     band->inherit_qdelta = band_flags & 8;

  414.     band->qdelta_present = band_flags & 4;

  415.     if (!band->qdelta_present) band->inherit_qdelta = 1;

  416. 

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

  418.     band->num_corr = 0; /* there are no corrections */

  419.     if (band_flags & 0x10) {

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

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

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

  423.                    band->num_corr);

  424.             return -1;

  425.         }

  426. 

  427.         /* read correction pairs */

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

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

  430.     }

  431. 

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

  433.     band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;

  434. 

  435.     /* decode block huffman codebook */

  436.     if (ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF, &band->blk_vlc, avctx))

  437.         return -1;

  438. 

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

  440.     if (band->checksum_present)

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

  442. 

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

  444. 

  445.     /* skip unknown extension if any */

  446.     if (band_flags & 0x20) { /* XXX: untested */

  447.         align_get_bits(&ctx->gb);

  448.         skip_hdr_extension(&ctx->gb);

  449.     }

  450. 

  451.     align_get_bits(&ctx->gb);

  452. 

  453.     return 0;

  454. }

  455. 

  456. 

  457. /**

  458.  *  Decode info (block type, cbp, quant delta, motion vector)

  459.  *  for all macroblocks in the current tile.

  460.  *

  461.  *  @param[in,out]  ctx    ptr to the decoder context

  462.  *  @param[in,out]  band   ptr to the band descriptor

  463.  *  @param[in,out]  tile   ptr to the tile descriptor

  464.  *  @param[in]      avctx  ptr to the AVCodecContext

  465.  *  @return         result code: 0 = OK, -1 = error

  466.  */

  467. static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,

  468.                           IVITile *tile, AVCodecContext *avctx)

  469. {

  470.     int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,

  471.                 mv_scale, blks_per_mb, s;

  472.     IVIMbInfo   *mb, *ref_mb;

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

  474. 

  475.     mb     = tile->mbs;

  476.     ref_mb = tile->ref_mbs;

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

  478. 

  479.     if (!ref_mb &&

  480.         ((band->qdelta_present && band->inherit_qdelta) || band->inherit_mv))

  481.         return AVERROR_INVALIDDATA;

  482. 

  483.     if( tile->num_MBs != IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size) ){

  484.         av_log(avctx, AV_LOG_ERROR, "allocated tile size %d mismatches parameters %d\n",

  485.                tile->num_MBs, IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size));

  486.         return AVERROR_INVALIDDATA;

  487.     }

  488. 

  489.     /* scale factor for motion vectors */

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

  491.     mv_x = mv_y = 0;

  492. 

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

  494.         mb_offset = offs;

  495. 

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

  497.             mb->xpos     = x;

  498.             mb->ypos     = y;

  499.             mb->buf_offs = mb_offset;

  500. 

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

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

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

  504.                     return -1;

  505.                 }

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

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

  508. 

  509.                 mb->q_delta = 0;

  510.                 if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {

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

  512.                                            IVI_VLC_BITS, 1);

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

  514.                 }

  515. 

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

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

  518.                     /* motion vector inheritance */

  519.                     if (mv_scale) {

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

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

  522.                     } else {

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

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

  525.                     }

  526.                 }

  527.             } else {

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

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

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

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

  532.                 } else {

  533.                     mb->type = get_bits1(&ctx->gb);

  534.                 }

  535. 

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

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

  538. 

  539.                 mb->q_delta = 0;

  540.                 if (band->qdelta_present) {

  541.                     if (band->inherit_qdelta) {

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

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

  544.                                            (ctx->frame_flags & 8))) {

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

  546.                                                IVI_VLC_BITS, 1);

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

  548.                     }

  549.                 }

  550. 

  551.                 if (!mb->type) {

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

  553.                 } else {

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

  555.                         /* motion vector inheritance */

  556.                         if (mv_scale) {

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

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

  559.                         } else {

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

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

  562.                         }

  563.                     } else {

  564.                         /* decode motion vector deltas */

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

  566.                                             IVI_VLC_BITS, 1);

  567.                         mv_y += IVI_TOSIGNED(mv_delta);

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

  569.                                             IVI_VLC_BITS, 1);

  570.                         mv_x += IVI_TOSIGNED(mv_delta);

  571.                         mb->mv_x = mv_x;

  572.                         mb->mv_y = mv_y;

  573.                     }

  574.                 }

  575.             }

  576. 

  577.             s= band->is_halfpel;

  578.             if (mb->type)

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

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

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

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

  583.                 return AVERROR_INVALIDDATA;

  584.             }

  585. 

  586.             mb++;

  587.             if (ref_mb)

  588.                 ref_mb++;

  589.             mb_offset += band->mb_size;

  590.         }

  591. 

  592.         offs += row_offset;

  593.     }

  594. 

  595.     align_get_bits(&ctx->gb);

  596. 

  597.     return 0;

  598. }

  599. 

  600. 

  601. /**

  602.  *  Decode an Indeo5 band.

  603.  *

  604.  *  @param[in,out]  ctx    ptr to the decoder context

  605.  *  @param[in,out]  band   ptr to the band descriptor

  606.  *  @param[in]      avctx  ptr to the AVCodecContext

  607.  *  @return         result code: 0 = OK, -1 = error

  608.  */

  609. static int decode_band(IVI5DecContext *ctx, int plane_num,

  610.                        IVIBandDesc *band, AVCodecContext *avctx)

  611. {

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

  613.     IVITile     *tile;

  614. 

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

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

  617.     band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);

  618. 

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

  620.     if (result) {

  621.         av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",

  622.                result);

  623.         return -1;

  624.     }

  625. 

  626.     if (band->is_empty) {

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

  628.         return -1;

  629.     }

  630. 

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

  632. 

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

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

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

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

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

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

  639.     }

  640. 

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

  642. 

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

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

  645. 

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

  647.         if (tile->is_empty) {

  648.             ff_ivi_process_empty_tile(avctx, band, tile,

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

  650.         } else {

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

  652. 

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

  654.             if (result < 0)

  655.                 break;

  656. 

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

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

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

  660.                 break;

  661.             }

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

  663.         }

  664.     }

  665. 

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

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

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

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

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

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

  672.     }

  673. 

  674. #ifdef DEBUG

  675.     if (band->checksum_present) {

  676.         uint16_t chksum = ivi_calc_band_checksum(band);

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

  678.             av_log(avctx, AV_LOG_ERROR,

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

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

  681.         }

  682.     }

  683. #endif

  684. 

  685.     align_get_bits(&ctx->gb);

  686. 

  687.     return result;

  688. }

  689. 

  690. 

  691. /**

  692.  *  Switch buffers.

  693.  *

  694.  *  @param[in,out] ctx  ptr to the decoder context

  695.  */

  696. static void switch_buffers(IVI5DecContext *ctx)

  697. {

  698.     switch (ctx->prev_frame_type) {

  699.     case FRAMETYPE_INTRA:

  700.     case FRAMETYPE_INTER:

  701.         ctx->buf_switch ^= 1;

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

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

  704.         break;

  705.     case FRAMETYPE_INTER_SCAL:

  706.         if (!ctx->inter_scal) {

  707.             ctx->ref2_buf   = 2;

  708.             ctx->inter_scal = 1;

  709.         }

  710.         FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);

  711.         ctx->ref_buf = ctx->ref2_buf;

  712.         break;

  713.     case FRAMETYPE_INTER_NOREF:

  714.         break;

  715.     }

  716. 

  717.     switch (ctx->frame_type) {

  718.     case FRAMETYPE_INTRA:

  719.         ctx->buf_switch = 0;

  720.         /* FALLTHROUGH */

  721.     case FRAMETYPE_INTER:

  722.         ctx->inter_scal = 0;

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

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

  725.         break;

  726.     case FRAMETYPE_INTER_SCAL:

  727.     case FRAMETYPE_INTER_NOREF:

  728.     case FRAMETYPE_NULL:

  729.         break;

  730.     }

  731. }

  732. 

  733. 

  734. /**

  735.  *  Initialize Indeo5 decoder.

  736.  */

  737. static av_cold int decode_init(AVCodecContext *avctx)

  738. {

  739.     IVI5DecContext  *ctx = avctx->priv_data;

  740.     int             result;

  741. 

  742.     ff_ivi_init_static_vlc();

  743. 

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

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

  746. 

  747.     /* set the initial picture layout according to the basic profile:

  748.        there is only one band per plane (no scalability), only one tile (no local decoding)

  749.        and picture format = YVU9 */

  750.     ctx->pic_conf.pic_width     = avctx->width;

  751.     ctx->pic_conf.pic_height    = avctx->height;

  752.     ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;

  753.     ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;

  754.     ctx->pic_conf.tile_width    = avctx->width;

  755.     ctx->pic_conf.tile_height   = avctx->height;

  756.     ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;

  757. 

  758.     avcodec_get_frame_defaults(&ctx->frame);

  759. 

  760.     result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);

  761.     if (result) {

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

  763.         return -1;

  764.     }

  765. 

  766.     ctx->buf_switch = 0;

  767.     ctx->inter_scal = 0;

  768. 

  769.     avctx->pix_fmt = PIX_FMT_YUV410P;

  770. 

  771.     return 0;

  772. }

  773. 

  774. 

  775. /**

  776.  *  main decoder function

  777.  */

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

  779.                         AVPacket *avpkt)

  780. {

  781.     IVI5DecContext  *ctx = avctx->priv_data;

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

  783.     int             buf_size = avpkt->size;

  784.     int             result, p, b;

  785. 

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

  787.     ctx->frame_data = buf;

  788.     ctx->frame_size = buf_size;

  789. 

  790.     result = decode_pic_hdr(ctx, avctx);

  791.     if (result || ctx->gop_invalid) {

  792.         av_log(avctx, AV_LOG_ERROR,

  793.                "Error while decoding picture header: %d\n", result);

  794.         return -1;

  795.     }

  796. 

  797.     if (ctx->gop_flags & IVI5_IS_PROTECTED) {

  798.         av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");

  799.         return -1;

  800.     }

  801. 

  802.     switch_buffers(ctx);

  803. 

  804.     //{ START_TIMER;

  805. 

  806.     if (ctx->frame_type != FRAMETYPE_NULL) {

  807.         ctx->buf_invalid[ctx->dst_buf] = 1;

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

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

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

  811.                 if (result) {

  812.                     av_log(avctx, AV_LOG_ERROR,

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

  814.                     return -1;

  815.                 }

  816.             }

  817.         }

  818.         ctx->buf_invalid[ctx->dst_buf] = 0;

  819.     }

  820.     if (ctx->buf_invalid[ctx->dst_buf])

  821.         return -1;

  822. 

  823.     //STOP_TIMER("decode_planes"); }

  824. 

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

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

  827. 

  828.     if(   avctx->width  != ctx->planes[0].width

  829.        || avctx->height != ctx->planes[0].height)

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

  831. 

  832.     ctx->frame.reference = 0;

  833.     if (avctx->get_buffer(avctx, &ctx->frame) < 0) {

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

  835.         return -1;

  836.     }

  837. 

  838.     if (ctx->is_scalable) {

  839.         ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);

  840.     } else {

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

  842.     }

  843. 

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

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

  846. 

  847.     *data_size = sizeof(AVFrame);

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

  849. 

  850.     return buf_size;

  851. }

  852. 

  853. 

  854. /**

  855.  *  Close Indeo5 decoder and clean up its context.

  856.  */

  857. static av_cold int decode_close(AVCodecContext *avctx)

  858. {

  859.     IVI5DecContext *ctx = avctx->priv_data;

  860. 

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

  862. 

  863.     if (ctx->mb_vlc.cust_tab.table)

  864.         ff_free_vlc(&ctx->mb_vlc.cust_tab);

  865. 

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

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

  868. 

  869.     return 0;

  870. }

  871. 

  872. 

  873. AVCodec ff_indeo5_decoder = {

  874.     .name           = "indeo5",

  875.     .type           = AVMEDIA_TYPE_VIDEO,

  876.     .id             = CODEC_ID_INDEO5,

  877.     .priv_data_size = sizeof(IVI5DecContext),

  878.     .init           = decode_init,

  879.     .close          = decode_close,

  880.     .decode         = decode_frame,

  881.     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),

  882. };