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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 libavcodec/indeo5.c

  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 ALT_BITSTREAM_READER_LE

  31. #include "avcodec.h"

  32. #include "get_bits.h"

  33. #include "ivi_dsp.h"

  34. #include "ivi_common.h"

  35. #include "indeo5data.h"

  36. 

  37. /**

  38.  *  Indeo5 frame types.

  39.  */

  40. enum {

  41.     FRAMETYPE_INTRA       = 0,

  42.     FRAMETYPE_INTER       = 1,  ///< non-droppable P-frame

  43.     FRAMETYPE_INTER_SCAL  = 2,  ///< droppable P-frame used in the scalability mode

  44.     FRAMETYPE_INTER_NOREF = 3,  ///< droppable P-frame

  45.     FRAMETYPE_NULL        = 4   ///< empty frame with no data

  46. };

  47. 

  48. #define IVI5_PIC_SIZE_ESC       15

  49. 

  50. #define IVI5_IS_PROTECTED       0x20

  51. 

  52. typedef struct {

  53.     GetBitContext   gb;

  54.     AVFrame         frame;

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

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

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

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

  59.     int             dst_buf;

  60.     int             ref_buf;

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

  62.     int             frame_type;

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

  64.     int             frame_num;

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

  66.     uint8_t         frame_flags;

  67.     uint16_t        checksum;        ///< frame checksum

  68. 

  69.     int16_t         mb_huff_sel;     ///< MB huffman table selector

  70.     IVIHuffDesc     mb_huff_desc;    ///< MB table descriptor associated with the selector above

  71.     VLC             *mb_vlc;         ///< ptr to the vlc table for decoding macroblock data

  72.     VLC             mb_vlc_cust;     ///< custom macroblock vlc table

  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. } IVI5DecContext;

  80. 

  81. //! static vlc tables (initialized at startup)

  82. static VLC mb_vlc_tabs [8];

  83. static VLC blk_vlc_tabs[8];

  84. 

  85. 

  86. /**

  87.  *  Decodes Indeo5 GOP (Group of pictures) header.

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

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

  90.  *

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

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

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

  94.  */

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

  96. {

  97.     int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size, 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.     ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;

  119.     if (ctx->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.         blk_size_changed = 1; /* force reallocation of the internal structures */

  158.     }

  159. 

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

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

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

  163. 

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

  165. 

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

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

  168.             mb_size  = blk_size << !mb_size;

  169. 

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

  171.             if (blk_size_changed) {

  172.                 band->mb_size  = mb_size;

  173.                 band->blk_size = blk_size;

  174.             }

  175. 

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

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

  178.                 return -1;

  179.             }

  180. 

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

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

  183.             case 0:

  184.                 band->inv_transform = ff_ivi_inverse_slant_8x8;

  185.                 band->dc_transform  = ff_ivi_dc_slant_2d;

  186.                 band->scan          = ivi5_scans8x8[0];

  187.                 break;

  188. 

  189.             case 1:

  190.                 band->inv_transform = ff_ivi_row_slant8;

  191.                 band->dc_transform  = ff_ivi_dc_row_slant;

  192.                 band->scan          = ivi5_scans8x8[1];

  193.                 break;

  194. 

  195.             case 2:

  196.                 band->inv_transform = ff_ivi_col_slant8;

  197.                 band->dc_transform  = ff_ivi_dc_col_slant;

  198.                 band->scan          = ivi5_scans8x8[2];

  199.                 break;

  200. 

  201.             case 3:

  202.                 band->inv_transform = ff_ivi_put_pixels_8x8;

  203.                 band->dc_transform  = ff_ivi_put_dc_pixel_8x8;

  204.                 band->scan          = ivi5_scans8x8[2];

  205.                 break;

  206. 

  207.             case 4:

  208.                 band->inv_transform = ff_ivi_inverse_slant_4x4;

  209.                 band->dc_transform  = ff_ivi_dc_slant_2d;

  210.                 band->scan          = ivi5_scan4x4;

  211.                 break;

  212.             }

  213. 

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

  215.                                 band->inv_transform == ff_ivi_inverse_slant_4x4;

  216. 

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

  218.             if (!p) {

  219.                 band->quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;

  220.             } else {

  221.                 band->quant_mat = 5;

  222.             }

  223. 

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

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

  226.                 return -1;

  227.             }

  228.         }

  229.     }

  230. 

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

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

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

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

  235. 

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

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

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

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

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

  241.         band2->quant_mat     = band1->quant_mat;

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

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

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

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

  246.     }

  247. 

  248.     /* reallocate internal structures if needed */

  249.     if (blk_size_changed) {

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

  251.                                    pic_conf.tile_height);

  252.         if (result) {

  253.             av_log(avctx, AV_LOG_ERROR,

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

  255.             return -1;

  256.         }

  257.     }

  258. 

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

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

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

  262.             return -1;

  263.         }

  264. 

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

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

  267.     }

  268. 

  269.     align_get_bits(&ctx->gb);

  270. 

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

  272. 

  273.     /* skip GOP extension if any */

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

  275.         do {

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

  277.         } while (i & 0x8000);

  278.     }

  279. 

  280.     align_get_bits(&ctx->gb);

  281. 

  282.     return 0;

  283. }

  284. 

  285. 

  286. /**

  287.  *  Skips a header extension.

  288.  *

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

  290.  */

  291. static inline void skip_hdr_extension(GetBitContext *gb)

  292. {

  293.     int i, len;

  294. 

  295.     do {

  296.         len = get_bits(gb, 8);

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

  298.     } while(len);

  299. }

  300. 

  301. 

  302. /**

  303.  *  Decodes Indeo5 picture header.

  304.  *

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

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

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

  308.  */

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

  310. {

  311.     int         result;

  312.     IVIHuffDesc new_huff;

  313. 

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

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

  316.         return -1;

  317.     }

  318. 

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

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

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

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

  323.         return -1;

  324.     }

  325. 

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

  327. 

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

  329.         if (decode_gop_header(ctx, avctx))

  330.             return -1;

  331.     }

  332. 

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

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

  335. 

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

  337. 

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

  339. 

  340.         /* skip unknown extension if any */

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

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

  343. 

  344.         /* decode macroblock huffman codebook */

  345.         if (ctx->frame_flags & 0x40) {

  346.             ctx->mb_huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);

  347.             if (ctx->mb_huff_sel != 7) {

  348.                 ctx->mb_vlc = &mb_vlc_tabs[ctx->mb_huff_sel];

  349.             } else {

  350.                 if (ff_ivi_huff_desc_cmp(&new_huff, &ctx->mb_huff_desc)) {

  351.                     ff_ivi_huff_desc_copy(&ctx->mb_huff_desc, &new_huff);

  352. 

  353.                     if (ctx->mb_vlc_cust.table)

  354.                         free_vlc(&ctx->mb_vlc_cust);

  355.                     result = ff_ivi_create_huff_from_desc(&ctx->mb_huff_desc,

  356.                                                           &ctx->mb_vlc_cust, 0);

  357.                     if (result) {

  358.                         av_log(avctx, AV_LOG_ERROR, "Error while initializing custom macroblock vlc table!\n");

  359.                         return -1;

  360.                     }

  361.                 }

  362.                 ctx->mb_vlc = &ctx->mb_vlc_cust;

  363.             }

  364.         } else {

  365.             ctx->mb_vlc = &mb_vlc_tabs[7]; /* select the default macroblock huffman table */

  366.         }

  367. 

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

  369.     }

  370. 

  371.     align_get_bits(&ctx->gb);

  372. 

  373.     return 0;

  374. }

  375. 

  376. 

  377. /**

  378.  *  Decodes Indeo5 band header.

  379.  *

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

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

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

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

  384.  */

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

  386.                            AVCodecContext *avctx)

  387. {

  388.     int         i, result;

  389.     uint8_t     band_flags;

  390.     IVIHuffDesc new_huff;

  391. 

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

  393. 

  394.     if (band_flags & 1) {

  395.         band->is_empty = 1;

  396.         return 0;

  397.     }

  398. 

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

  400. 

  401.     band->inherit_mv     = band_flags & 2;

  402.     band->inherit_qdelta = band_flags & 8;

  403.     band->qdelta_present = band_flags & 4;

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

  405. 

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

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

  408.     if (band_flags & 0x10) {

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

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

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

  412.                    band->num_corr);

  413.             return -1;

  414.         }

  415. 

  416.         /* read correction pairs */

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

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

  419.     }

  420. 

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

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

  423. 

  424.     /* decode block huffman codebook */

  425.     if (band_flags & 0x80) {

  426.         band->huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);

  427.         if (band->huff_sel != 7) {

  428.             band->blk_vlc = &blk_vlc_tabs[band->huff_sel];

  429.         } else {

  430.             if (ff_ivi_huff_desc_cmp(&new_huff, &band->huff_desc)) {

  431.                 ff_ivi_huff_desc_copy(&band->huff_desc, &new_huff);

  432. 

  433.                 if (band->blk_vlc_cust.table)

  434.                     free_vlc(&band->blk_vlc_cust);

  435.                 result = ff_ivi_create_huff_from_desc(&band->huff_desc,

  436.                                                       &band->blk_vlc_cust, 0);

  437.                 if (result) {

  438.                     av_log(avctx, AV_LOG_ERROR, "Error while initializing custom block vlc table!\n");

  439.                     return -1;

  440.                 }

  441.             }

  442.             band->blk_vlc = &band->blk_vlc_cust;

  443.         }

  444.     } else {

  445.         band->blk_vlc = &blk_vlc_tabs[7]; /* select the default macroblock huffman table */

  446.     }

  447. 

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

  449.     if (band->checksum_present)

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

  451. 

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

  453. 

  454.     /* skip unknown extension if any */

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

  456.         align_get_bits(&ctx->gb);

  457.         skip_hdr_extension(&ctx->gb);

  458.     }

  459. 

  460.     align_get_bits(&ctx->gb);

  461. 

  462.     return 0;

  463. }

  464. 

  465. 

  466. /**

  467.  *  Decodes info (block type, cbp, quant delta, motion vector)

  468.  *  for all macroblocks in the current tile.

  469.  *

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

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

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

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

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

  475.  */

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

  477.                           IVITile *tile, AVCodecContext *avctx)

  478. {

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

  480.                 mv_scale, blks_per_mb;

  481.     IVIMbInfo   *mb, *ref_mb;

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

  483. 

  484.     mb     = tile->mbs;

  485.     ref_mb = tile->ref_mbs;

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

  487. 

  488.     /* scale factor for motion vectors */

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

  490.     mv_x = mv_y = 0;

  491. 

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

  493.         mb_offset = offs;

  494. 

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

  496.             mb->xpos     = x;

  497.             mb->ypos     = y;

  498.             mb->buf_offs = mb_offset;

  499. 

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

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

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

  503.                     return -1;

  504.                 }

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

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

  507. 

  508.                 mb->q_delta = 0;

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

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

  511.                                            IVI_VLC_BITS, 1);

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

  513.                 }

  514. 

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

  516.                 if (band->inherit_mv){

  517.                     /* motion vector inheritance */

  518.                     if (mv_scale) {

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

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

  521.                     } else {

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

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

  524.                     }

  525.                 }

  526.             } else {

  527.                 if (band->inherit_mv) {

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

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

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

  531.                 } else {

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

  533.                 }

  534. 

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

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

  537. 

  538.                 mb->q_delta = 0;

  539.                 if (band->qdelta_present) {

  540.                     if (band->inherit_qdelta) {

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

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

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

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

  545.                                                IVI_VLC_BITS, 1);

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

  547.                     }

  548.                 }

  549. 

  550.                 if (!mb->type) {

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

  552.                 } else {

  553.                     if (band->inherit_mv){

  554.                         /* motion vector inheritance */

  555.                         if (mv_scale) {

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

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

  558.                         } else {

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

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

  561.                         }

  562.                     } else {

  563.                         /* decode motion vector deltas */

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

  565.                                             IVI_VLC_BITS, 1);

  566.                         mv_y += IVI_TOSIGNED(mv_delta);

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

  568.                                             IVI_VLC_BITS, 1);

  569.                         mv_x += IVI_TOSIGNED(mv_delta);

  570.                         mb->mv_x = mv_x;

  571.                         mb->mv_y = mv_y;

  572.                     }

  573.                 }

  574.             }

  575. 

  576.             mb++;

  577.             if (ref_mb)

  578.                 ref_mb++;

  579.             mb_offset += band->mb_size;

  580.         }

  581. 

  582.         offs += row_offset;

  583.     }

  584. 

  585.     align_get_bits(&ctx->gb);

  586. 

  587.     return 0;

  588. }

  589. 

  590. 

  591. /**

  592.  *  Decodes an Indeo5 band.

  593.  *

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

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

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

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

  598.  */

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

  600.                        IVIBandDesc *band, AVCodecContext *avctx)

  601. {

  602.     int         result, i, t, idx1, idx2;

  603.     IVITile     *tile;

  604. 

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

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

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

  608. 

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

  610.     if (result) {

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

  612.                result);

  613.         return -1;

  614.     }

  615. 

  616.     if (band->is_empty) {

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

  618.         return -1;

  619.     }

  620. 

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

  622. 

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

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

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

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

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

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

  629.     }

  630. 

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

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

  633. 

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

  635.         if (tile->is_empty) {

  636.             ff_ivi_process_empty_tile(avctx, band, tile,

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

  638.             align_get_bits(&ctx->gb);

  639.         } else {

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

  641. 

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

  643.             if (result < 0)

  644.                 break;

  645. 

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

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

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

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

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

  651.             } else {

  652.                 band->intra_base  = ivi5_base_quant_4x4_intra;

  653.                 band->inter_base  = ivi5_base_quant_4x4_inter;

  654.                 band->intra_scale = ivi5_scale_quant_4x4_intra;

  655.                 band->inter_scale = ivi5_scale_quant_4x4_inter;

  656.             }

  657. 

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

  659.             if (result < 0) {

  660.                 av_log(avctx, AV_LOG_ERROR, "Corrupted blocks data encountered!\n");

  661.                 break;

  662.             }

  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. #if IVI_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.     return result;

  686. }

  687. 

  688. 

  689. /**

  690.  *  Switches buffers.

  691.  *

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

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

  694.  */

  695. static void switch_buffers(IVI5DecContext *ctx, AVCodecContext *avctx)

  696. {

  697.     switch (ctx->frame_type) {

  698.     case FRAMETYPE_INTRA:

  699.         ctx->buf_switch = 0;

  700.         ctx->dst_buf    = 0;

  701.         ctx->ref_buf    = 0;

  702.         break;

  703.     case FRAMETYPE_INTER:

  704.         ctx->buf_switch &= 1;

  705.         /* swap buffers only if there were no droppable frames */

  706.         if (ctx->prev_frame_type != FRAMETYPE_INTER_NOREF &&

  707.             ctx->prev_frame_type != FRAMETYPE_INTER_SCAL)

  708.             ctx->buf_switch ^= 1;

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

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

  711.         break;

  712.     case FRAMETYPE_INTER_SCAL:

  713.         if (ctx->prev_frame_type == FRAMETYPE_INTER_NOREF)

  714.             break;

  715.         if (ctx->prev_frame_type != FRAMETYPE_INTER_SCAL) {

  716.             ctx->buf_switch ^= 1;

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

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

  719.         } else {

  720.             ctx->buf_switch ^= 2;

  721.             ctx->dst_buf = 2;

  722.             ctx->ref_buf = ctx->buf_switch & 1;

  723.             if (!(ctx->buf_switch & 2))

  724.                 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);

  725.         }

  726.         break;

  727.     case FRAMETYPE_INTER_NOREF:

  728.         if (ctx->prev_frame_type == FRAMETYPE_INTER_SCAL) {

  729.             ctx->buf_switch ^= 2;

  730.             ctx->dst_buf = 2;

  731.             ctx->ref_buf = ctx->buf_switch & 1;

  732.             if (!(ctx->buf_switch & 2))

  733.                 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);

  734.         } else {

  735.             ctx->buf_switch ^= 1;

  736.             ctx->dst_buf     =  ctx->buf_switch & 1;

  737.             ctx->ref_buf     = (ctx->buf_switch & 1) ^ 1;

  738.         }

  739.         break;

  740.     case FRAMETYPE_NULL:

  741.         return;

  742.     default:

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

  744.     }

  745. }

  746. 

  747. 

  748. /**

  749.  *  Initializes Indeo5 decoder.

  750.  */

  751. static av_cold int decode_init(AVCodecContext *avctx)

  752. {

  753.     IVI5DecContext  *ctx = avctx->priv_data;

  754.     int             i, result;

  755. 

  756.     /* initialize static vlc tables for macroblock/block signals */

  757.     for (i = 0; i < 8; i++) {

  758.         ff_ivi_create_huff_from_desc(&ff_ivi_mb_huff_desc[i],  &mb_vlc_tabs[i],  1);

  759.         ff_ivi_create_huff_from_desc(&ff_ivi_blk_huff_desc[i], &blk_vlc_tabs[i], 1);

  760.     }

  761. 

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

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

  764. 

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

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

  767.        and picture format = YVU9 */

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

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

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

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

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

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

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

  775. 

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

  777.     if (result) {

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

  779.         return -1;

  780.     }

  781. 

  782.     avctx->pix_fmt = PIX_FMT_YUV410P;

  783. 

  784.     return 0;

  785. }

  786. 

  787. 

  788. /**

  789.  *  main decoder function

  790.  */

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

  792.                         AVPacket *avpkt)

  793. {

  794.     IVI5DecContext  *ctx = avctx->priv_data;

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

  796.     int             buf_size = avpkt->size;

  797.     int             result, p, b;

  798. 

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

  800.     ctx->frame_data = buf;

  801.     ctx->frame_size = buf_size;

  802. 

  803.     result = decode_pic_hdr(ctx, avctx);

  804.     if (result) {

  805.         av_log(avctx, AV_LOG_ERROR,

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

  807.         return -1;

  808.     }

  809. 

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

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

  812.         return -1;

  813.     }

  814. 

  815.     switch_buffers(ctx, avctx);

  816. 

  817.     //START_TIMER;

  818. 

  819.     if (ctx->frame_type == FRAMETYPE_NULL) {

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

  821.     } else {

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

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

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

  825.                 if (result) {

  826.                     av_log(avctx, AV_LOG_ERROR,

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

  828.                     return -1;

  829.                 }

  830.             }

  831.         }

  832.     }

  833. 

  834.     //STOP_TIMER("decode_planes");

  835. 

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

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

  838. 

  839.     ctx->frame.reference = 0;

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

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

  842.         return -1;

  843.     }

  844. 

  845.     if (ctx->is_scalable) {

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

  847.     } else {

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

  849.     }

  850. 

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

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

  853. 

  854.     *data_size = sizeof(AVFrame);

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

  856. 

  857.     return buf_size;

  858. }

  859. 

  860. 

  861. /**

  862.  *  Closes Indeo5 decoder and cleans up its context.

  863.  */

  864. static av_cold int decode_close(AVCodecContext *avctx)

  865. {

  866.     IVI5DecContext *ctx = avctx->priv_data;

  867. 

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

  869. 

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

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

  872. 

  873.     return 0;

  874. }

  875. 

  876. 

  877. AVCodec indeo5_decoder = {

  878.     .name           = "indeo5",

  879.     .type           = CODEC_TYPE_VIDEO,

  880.     .id             = CODEC_ID_INDEO5,

  881.     .priv_data_size = sizeof(IVI5DecContext),

  882.     .init           = decode_init,

  883.     .close          = decode_close,

  884.     .decode         = decode_frame,

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

  886. };