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FFmpeg/libavcodec/indeo3.c

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  1. /*

  2.  * Indeo Video v3 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.  * This is a decoder for Intel Indeo Video v3.

  25.  * It is based on vector quantization, run-length coding and motion compensation.

  26.  * Known container formats: .avi and .mov

  27.  * Known FOURCCs: 'IV31', 'IV32'

  28.  *

  29.  * @see http://wiki.multimedia.cx/index.php?title=Indeo_3

  30.  */

  31. 

  32. #include "libavutil/imgutils.h"

  33. #include "libavutil/intreadwrite.h"

  34. #include "avcodec.h"

  35. #include "dsputil.h"

  36. #include "bytestream.h"

  37. #include "get_bits.h"

  38. 

  39. #include "indeo3data.h"

  40. 

  41. /* RLE opcodes. */

  42. enum {

  43.     RLE_ESC_F9    = 249, ///< same as RLE_ESC_FA + do the same with next block

  44.     RLE_ESC_FA    = 250, ///< INTRA: skip block, INTER: copy data from reference

  45.     RLE_ESC_FB    = 251, ///< apply null delta to N blocks / skip N blocks

  46.     RLE_ESC_FC    = 252, ///< same as RLE_ESC_FD + do the same with next block

  47.     RLE_ESC_FD    = 253, ///< apply null delta to all remaining lines of this block

  48.     RLE_ESC_FE    = 254, ///< apply null delta to all lines up to the 3rd line

  49.     RLE_ESC_FF    = 255  ///< apply null delta to all lines up to the 2nd line

  50. };

  51. 

  52. 

  53. /* Some constants for parsing frame bitstream flags. */

  54. #define BS_8BIT_PEL     (1 << 1) ///< 8bit pixel bitdepth indicator

  55. #define BS_KEYFRAME     (1 << 2) ///< intra frame indicator

  56. #define BS_MV_Y_HALF    (1 << 4) ///< vertical mv halfpel resolution indicator

  57. #define BS_MV_X_HALF    (1 << 5) ///< horizontal mv halfpel resolution indicator

  58. #define BS_NONREF       (1 << 8) ///< nonref (discardable) frame indicator

  59. #define BS_BUFFER        9       ///< indicates which of two frame buffers should be used

  60. 

  61. 

  62. typedef struct Plane {

  63.     uint8_t         *buffers[2];

  64.     uint8_t         *pixels[2]; ///< pointer to the actual pixel data of the buffers above

  65.     uint32_t        width;

  66.     uint32_t        height;

  67.     uint32_t        pitch;

  68. } Plane;

  69. 

  70. #define CELL_STACK_MAX  20

  71. 

  72. typedef struct Cell {

  73.     int16_t         xpos;       ///< cell coordinates in 4x4 blocks

  74.     int16_t         ypos;

  75.     int16_t         width;      ///< cell width  in 4x4 blocks

  76.     int16_t         height;     ///< cell height in 4x4 blocks

  77.     uint8_t         tree;       ///< tree id: 0- MC tree, 1 - VQ tree

  78.     const int8_t    *mv_ptr;    ///< ptr to the motion vector if any

  79. } Cell;

  80. 

  81. typedef struct Indeo3DecodeContext {

  82.     AVCodecContext *avctx;

  83.     AVFrame         frame;

  84.     DSPContext      dsp;

  85. 

  86.     GetBitContext   gb;

  87.     int             need_resync;

  88.     int             skip_bits;

  89.     const uint8_t   *next_cell_data;

  90.     const uint8_t   *last_byte;

  91.     const int8_t    *mc_vectors;

  92.     unsigned        num_vectors;    ///< number of motion vectors in mc_vectors

  93. 

  94.     int16_t         width, height;

  95.     uint32_t        frame_num;      ///< current frame number (zero-based)

  96.     uint32_t        data_size;      ///< size of the frame data in bytes

  97.     uint16_t        frame_flags;    ///< frame properties

  98.     uint8_t         cb_offset;      ///< needed for selecting VQ tables

  99.     uint8_t         buf_sel;        ///< active frame buffer: 0 - primary, 1 -secondary

  100.     const uint8_t   *y_data_ptr;

  101.     const uint8_t   *v_data_ptr;

  102.     const uint8_t   *u_data_ptr;

  103.     int32_t         y_data_size;

  104.     int32_t         v_data_size;

  105.     int32_t         u_data_size;

  106.     const uint8_t   *alt_quant;     ///< secondary VQ table set for the modes 1 and 4

  107.     Plane           planes[3];

  108. } Indeo3DecodeContext;

  109. 

  110. 

  111. static uint8_t requant_tab[8][128];

  112. 

  113. /*

  114.  *  Build the static requantization table.

  115.  *  This table is used to remap pixel values according to a specific

  116.  *  quant index and thus avoid overflows while adding deltas.

  117.  */

  118. static av_cold void build_requant_tab(void)

  119. {

  120.     static int8_t offsets[8] = { 1, 1, 2, -3, -3, 3, 4, 4 };

  121.     static int8_t deltas [8] = { 0, 1, 0,  4,  4, 1, 0, 1 };

  122. 

  123.     int i, j, step;

  124. 

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

  126.         step = i + 2;

  127.         for (j = 0; j < 128; j++)

  128.                 requant_tab[i][j] = (j + offsets[i]) / step * step + deltas[i];

  129.     }

  130. 

  131.     /* some last elements calculated above will have values >= 128 */

  132.     /* pixel values shall never exceed 127 so set them to non-overflowing values */

  133.     /* according with the quantization step of the respective section */

  134.     requant_tab[0][127] = 126;

  135.     requant_tab[1][119] = 118;

  136.     requant_tab[1][120] = 118;

  137.     requant_tab[2][126] = 124;

  138.     requant_tab[2][127] = 124;

  139.     requant_tab[6][124] = 120;

  140.     requant_tab[6][125] = 120;

  141.     requant_tab[6][126] = 120;

  142.     requant_tab[6][127] = 120;

  143. 

  144.     /* Patch for compatibility with the Intel's binary decoders */

  145.     requant_tab[1][7] = 10;

  146.     requant_tab[4][8] = 10;

  147. }

  148. 

  149. 

  150. static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,

  151.                                           AVCodecContext *avctx)

  152. {

  153.     int p, luma_width, luma_height, chroma_width, chroma_height;

  154.     int luma_pitch, chroma_pitch, luma_size, chroma_size;

  155. 

  156.     luma_width  = ctx->width;

  157.     luma_height = ctx->height;

  158. 

  159.     if (luma_width  < 16 || luma_width  > 640 ||

  160.         luma_height < 16 || luma_height > 480 ||

  161.         luma_width  &  3 || luma_height &   3) {

  162.         av_log(avctx, AV_LOG_ERROR, "Invalid picture dimensions: %d x %d!\n",

  163.                luma_width, luma_height);

  164.         return AVERROR_INVALIDDATA;

  165.     }

  166. 

  167.     chroma_width  = FFALIGN(luma_width  >> 2, 4);

  168.     chroma_height = FFALIGN(luma_height >> 2, 4);

  169. 

  170.     luma_pitch   = FFALIGN(luma_width,   16);

  171.     chroma_pitch = FFALIGN(chroma_width, 16);

  172. 

  173.     /* Calculate size of the luminance plane.  */

  174.     /* Add one line more for INTRA prediction. */

  175.     luma_size = luma_pitch * (luma_height + 1);

  176. 

  177.     /* Calculate size of a chrominance planes. */

  178.     /* Add one line more for INTRA prediction. */

  179.     chroma_size = chroma_pitch * (chroma_height + 1);

  180. 

  181.     /* allocate frame buffers */

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

  183.         ctx->planes[p].pitch  = !p ? luma_pitch  : chroma_pitch;

  184.         ctx->planes[p].width  = !p ? luma_width  : chroma_width;

  185.         ctx->planes[p].height = !p ? luma_height : chroma_height;

  186. 

  187.         ctx->planes[p].buffers[0] = av_malloc(!p ? luma_size : chroma_size);

  188.         ctx->planes[p].buffers[1] = av_malloc(!p ? luma_size : chroma_size);

  189. 

  190.         /* fill the INTRA prediction lines with the middle pixel value = 64 */

  191.         memset(ctx->planes[p].buffers[0], 0x40, ctx->planes[p].pitch);

  192.         memset(ctx->planes[p].buffers[1], 0x40, ctx->planes[p].pitch);

  193. 

  194.         /* set buffer pointers = buf_ptr + pitch and thus skip the INTRA prediction line */

  195.         ctx->planes[p].pixels[0] = ctx->planes[p].buffers[0] + ctx->planes[p].pitch;

  196.         ctx->planes[p].pixels[1] = ctx->planes[p].buffers[1] + ctx->planes[p].pitch;

  197.         memset(ctx->planes[p].pixels[0], 0, ctx->planes[p].pitch * ctx->planes[p].height);

  198.         memset(ctx->planes[p].pixels[1], 0, ctx->planes[p].pitch * ctx->planes[p].height);

  199.     }

  200. 

  201.     return 0;

  202. }

  203. 

  204. 

  205. static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx)

  206. {

  207.     int p;

  208. 

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

  210.         av_freep(&ctx->planes[p].buffers[0]);

  211.         av_freep(&ctx->planes[p].buffers[1]);

  212.         ctx->planes[p].pixels[0] = ctx->planes[p].pixels[1] = 0;

  213.     }

  214. }

  215. 

  216. 

  217. /**

  218.  *  Copy pixels of the cell(x + mv_x, y + mv_y) from the previous frame into

  219.  *  the cell(x, y) in the current frame.

  220.  *

  221.  *  @param ctx      pointer to the decoder context

  222.  *  @param plane    pointer to the plane descriptor

  223.  *  @param cell     pointer to the cell  descriptor

  224.  */

  225. static void copy_cell(Indeo3DecodeContext *ctx, Plane *plane, Cell *cell)

  226. {

  227.     int     h, w, mv_x, mv_y, offset, offset_dst;

  228.     uint8_t *src, *dst;

  229. 

  230.     /* setup output and reference pointers */

  231.     offset_dst  = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);

  232.     dst         = plane->pixels[ctx->buf_sel] + offset_dst;

  233.     mv_y        = cell->mv_ptr[0];

  234.     mv_x        = cell->mv_ptr[1];

  235.     offset      = offset_dst + mv_y * plane->pitch + mv_x;

  236.     src         = plane->pixels[ctx->buf_sel ^ 1] + offset;

  237. 

  238.     h = cell->height << 2;

  239. 

  240.     for (w = cell->width; w > 0;) {

  241.         /* copy using 16xH blocks */

  242.         if (!((cell->xpos << 2) & 15) && w >= 4) {

  243.             for (; w >= 4; src += 16, dst += 16, w -= 4)

  244.                 ctx->dsp.put_no_rnd_pixels_tab[0][0](dst, src, plane->pitch, h);

  245.         }

  246. 

  247.         /* copy using 8xH blocks */

  248.         if (!((cell->xpos << 2) & 7) && w >= 2) {

  249.             ctx->dsp.put_no_rnd_pixels_tab[1][0](dst, src, plane->pitch, h);

  250.             w -= 2;

  251.             src += 8;

  252.             dst += 8;

  253.         }

  254. 

  255.         if (w >= 1) {

  256.             copy_block4(dst, src, plane->pitch, plane->pitch, h);

  257.             w--;

  258.             src += 4;

  259.             dst += 4;

  260.         }

  261.     }

  262. }

  263. 

  264. 

  265. /* Average 4/8 pixels at once without rounding using SWAR */

  266. #define AVG_32(dst, src, ref) \

  267.     AV_WN32A(dst, ((AV_RN32A(src) + AV_RN32A(ref)) >> 1) & 0x7F7F7F7FUL)

  268. 

  269. #define AVG_64(dst, src, ref) \

  270.     AV_WN64A(dst, ((AV_RN64A(src) + AV_RN64A(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL)

  271. 

  272. 

  273. /*

  274.  *  Replicate each even pixel as follows:

  275.  *  ABCDEFGH -> AACCEEGG

  276.  */

  277. static inline uint64_t replicate64(uint64_t a) {

  278. #if HAVE_BIGENDIAN

  279.     a &= 0xFF00FF00FF00FF00ULL;

  280.     a |= a >> 8;

  281. #else

  282.     a &= 0x00FF00FF00FF00FFULL;

  283.     a |= a << 8;

  284. #endif

  285.     return a;

  286. }

  287. 

  288. static inline uint32_t replicate32(uint32_t a) {

  289. #if HAVE_BIGENDIAN

  290.     a &= 0xFF00FF00UL;

  291.     a |= a >> 8;

  292. #else

  293.     a &= 0x00FF00FFUL;

  294.     a |= a << 8;

  295. #endif

  296.     return a;

  297. }

  298. 

  299. 

  300. /* Fill n lines with 64bit pixel value pix */

  301. static inline void fill_64(uint8_t *dst, const uint64_t pix, int32_t n,

  302.                            int32_t row_offset)

  303. {

  304.     for (; n > 0; dst += row_offset, n--)

  305.         AV_WN64A(dst, pix);

  306. }

  307. 

  308. 

  309. /* Error codes for cell decoding. */

  310. enum {

  311.     IV3_NOERR       = 0,

  312.     IV3_BAD_RLE     = 1,

  313.     IV3_BAD_DATA    = 2,

  314.     IV3_BAD_COUNTER = 3,

  315.     IV3_UNSUPPORTED = 4,

  316.     IV3_OUT_OF_DATA = 5

  317. };

  318. 

  319. 

  320. #define BUFFER_PRECHECK \

  321. if (*data_ptr >= last_ptr) \

  322.     return IV3_OUT_OF_DATA; \

  323. 

  324. #define RLE_BLOCK_COPY \

  325.     if (cell->mv_ptr || !skip_flag) \

  326.         copy_block4(dst, ref, row_offset, row_offset, 4 << v_zoom)

  327. 

  328. #define RLE_BLOCK_COPY_8 \

  329.     pix64 = AV_RN64A(ref);\

  330.     if (is_first_row) {/* special prediction case: top line of a cell */\

  331.         pix64 = replicate64(pix64);\

  332.         fill_64(dst + row_offset, pix64, 7, row_offset);\

  333.         AVG_64(dst, ref, dst + row_offset);\

  334.     } else \

  335.         fill_64(dst, pix64, 8, row_offset)

  336. 

  337. #define RLE_LINES_COPY \

  338.     copy_block4(dst, ref, row_offset, row_offset, num_lines << v_zoom)

  339. 

  340. #define RLE_LINES_COPY_M10 \

  341.     pix64 = AV_RN64A(ref);\

  342.     if (is_top_of_cell) {\

  343.         pix64 = replicate64(pix64);\

  344.         fill_64(dst + row_offset, pix64, (num_lines << 1) - 1, row_offset);\

  345.         AVG_64(dst, ref, dst + row_offset);\

  346.     } else \

  347.         fill_64(dst, pix64, num_lines << 1, row_offset)

  348. 

  349. #define APPLY_DELTA_4 \

  350.     AV_WN16A(dst + line_offset    ,\

  351.              (AV_RN16A(ref    ) + delta_tab->deltas[dyad1]) & 0x7F7F);\

  352.     AV_WN16A(dst + line_offset + 2,\

  353.              (AV_RN16A(ref + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\

  354.     if (mode >= 3) {\

  355.         if (is_top_of_cell && !cell->ypos) {\

  356.             AV_COPY32(dst, dst + row_offset);\

  357.         } else {\

  358.             AVG_32(dst, ref, dst + row_offset);\

  359.         }\

  360.     }

  361. 

  362. #define APPLY_DELTA_8 \

  363.     /* apply two 32-bit VQ deltas to next even line */\

  364.     if (is_top_of_cell) { \

  365.         AV_WN32A(dst + row_offset    , \

  366.                  (replicate32(AV_RN32A(ref    )) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\

  367.         AV_WN32A(dst + row_offset + 4, \

  368.                  (replicate32(AV_RN32A(ref + 4)) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\

  369.     } else { \

  370.         AV_WN32A(dst + row_offset    , \

  371.                  (AV_RN32A(ref    ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\

  372.         AV_WN32A(dst + row_offset + 4, \

  373.                  (AV_RN32A(ref + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\

  374.     } \

  375.     /* odd lines are not coded but rather interpolated/replicated */\

  376.     /* first line of the cell on the top of image? - replicate */\

  377.     /* otherwise - interpolate */\

  378.     if (is_top_of_cell && !cell->ypos) {\

  379.         AV_COPY64(dst, dst + row_offset);\

  380.     } else \

  381.         AVG_64(dst, ref, dst + row_offset);

  382. 

  383. 

  384. #define APPLY_DELTA_1011_INTER \

  385.     if (mode == 10) { \

  386.         AV_WN32A(dst                 , \

  387.                  (AV_RN32A(dst                 ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\

  388.         AV_WN32A(dst + 4             , \

  389.                  (AV_RN32A(dst + 4             ) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\

  390.         AV_WN32A(dst + row_offset    , \

  391.                  (AV_RN32A(dst + row_offset    ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\

  392.         AV_WN32A(dst + row_offset + 4, \

  393.                  (AV_RN32A(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\

  394.     } else { \

  395.         AV_WN16A(dst                 , \

  396.                  (AV_RN16A(dst                 ) + delta_tab->deltas[dyad1]) & 0x7F7F);\

  397.         AV_WN16A(dst + 2             , \

  398.                  (AV_RN16A(dst + 2             ) + delta_tab->deltas[dyad2]) & 0x7F7F);\

  399.         AV_WN16A(dst + row_offset    , \

  400.                  (AV_RN16A(dst + row_offset    ) + delta_tab->deltas[dyad1]) & 0x7F7F);\

  401.         AV_WN16A(dst + row_offset + 2, \

  402.                  (AV_RN16A(dst + row_offset + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\

  403.     }

  404. 

  405. 

  406. static int decode_cell_data(Cell *cell, uint8_t *block, uint8_t *ref_block,

  407.                             int pitch, int h_zoom, int v_zoom, int mode,

  408.                             const vqEntry *delta[2], int swap_quads[2],

  409.                             const uint8_t **data_ptr, const uint8_t *last_ptr)

  410. {

  411.     int           x, y, line, num_lines;

  412.     int           rle_blocks = 0;

  413.     uint8_t       code, *dst, *ref;

  414.     const vqEntry *delta_tab;

  415.     unsigned int  dyad1, dyad2;

  416.     uint64_t      pix64;

  417.     int           skip_flag = 0, is_top_of_cell, is_first_row = 1;

  418.     int           row_offset, blk_row_offset, line_offset;

  419. 

  420.     row_offset     =  pitch;

  421.     blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2);

  422.     line_offset    = v_zoom ? row_offset : 0;

  423. 

  424.     for (y = 0; y < cell->height; is_first_row = 0, y += 1 + v_zoom) {

  425.         for (x = 0; x < cell->width; x += 1 + h_zoom) {

  426.             ref = ref_block;

  427.             dst = block;

  428. 

  429.             if (rle_blocks > 0) {

  430.                 if (mode <= 4) {

  431.                     RLE_BLOCK_COPY;

  432.                 } else if (mode == 10 && !cell->mv_ptr) {

  433.                     RLE_BLOCK_COPY_8;

  434.                 }

  435.                 rle_blocks--;

  436.             } else {

  437.                 for (line = 0; line < 4;) {

  438.                     num_lines = 1;

  439.                     is_top_of_cell = is_first_row && !line;

  440. 

  441.                     /* select primary VQ table for odd, secondary for even lines */

  442.                     if (mode <= 4)

  443.                         delta_tab = delta[line & 1];

  444.                     else

  445.                         delta_tab = delta[1];

  446.                     BUFFER_PRECHECK;

  447.                     code = bytestream_get_byte(data_ptr);

  448.                     if (code < 248) {

  449.                         if (code < delta_tab->num_dyads) {

  450.                             BUFFER_PRECHECK;

  451.                             dyad1 = bytestream_get_byte(data_ptr);

  452.                             dyad2 = code;

  453.                             if (dyad1 >= delta_tab->num_dyads || dyad1 >= 248)

  454.                                 return IV3_BAD_DATA;

  455.                         } else {

  456.                             /* process QUADS */

  457.                             code -= delta_tab->num_dyads;

  458.                             dyad1 = code / delta_tab->quad_exp;

  459.                             dyad2 = code % delta_tab->quad_exp;

  460.                             if (swap_quads[line & 1])

  461.                                 FFSWAP(unsigned int, dyad1, dyad2);

  462.                         }

  463.                         if (mode <= 4) {

  464.                             APPLY_DELTA_4;

  465.                         } else if (mode == 10 && !cell->mv_ptr) {

  466.                             APPLY_DELTA_8;

  467.                         } else {

  468.                             APPLY_DELTA_1011_INTER;

  469.                         }

  470.                     } else {

  471.                         /* process RLE codes */

  472.                         switch (code) {

  473.                         case RLE_ESC_FC:

  474.                             skip_flag  = 0;

  475.                             rle_blocks = 1;

  476.                             code       = 253;

  477.                             /* FALLTHROUGH */

  478.                         case RLE_ESC_FF:

  479.                         case RLE_ESC_FE:

  480.                         case RLE_ESC_FD:

  481.                             num_lines = 257 - code - line;

  482.                             if (num_lines <= 0)

  483.                                 return IV3_BAD_RLE;

  484.                             if (mode <= 4) {

  485.                                 RLE_LINES_COPY;

  486.                             } else if (mode == 10 && !cell->mv_ptr) {

  487.                                 RLE_LINES_COPY_M10;

  488.                             }

  489.                             break;

  490.                         case RLE_ESC_FB:

  491.                             BUFFER_PRECHECK;

  492.                             code = bytestream_get_byte(data_ptr);

  493.                             rle_blocks = (code & 0x1F) - 1; /* set block counter */

  494.                             if (code >= 64 || rle_blocks < 0)

  495.                                 return IV3_BAD_COUNTER;

  496.                             skip_flag = code & 0x20;

  497.                             num_lines = 4 - line; /* enforce next block processing */

  498.                             if (mode >= 10 || (cell->mv_ptr || !skip_flag)) {

  499.                                 if (mode <= 4) {

  500.                                     RLE_LINES_COPY;

  501.                                 } else if (mode == 10 && !cell->mv_ptr) {

  502.                                     RLE_LINES_COPY_M10;

  503.                                 }

  504.                             }

  505.                             break;

  506.                         case RLE_ESC_F9:

  507.                             skip_flag  = 1;

  508.                             rle_blocks = 1;

  509.                             /* FALLTHROUGH */

  510.                         case RLE_ESC_FA:

  511.                             if (line)

  512.                                 return IV3_BAD_RLE;

  513.                             num_lines = 4; /* enforce next block processing */

  514.                             if (cell->mv_ptr) {

  515.                                 if (mode <= 4) {

  516.                                     RLE_LINES_COPY;

  517.                                 } else if (mode == 10 && !cell->mv_ptr) {

  518.                                     RLE_LINES_COPY_M10;

  519.                                 }

  520.                             }

  521.                             break;

  522.                         default:

  523.                             return IV3_UNSUPPORTED;

  524.                         }

  525.                     }

  526. 

  527.                     line += num_lines;

  528.                     ref  += row_offset * (num_lines << v_zoom);

  529.                     dst  += row_offset * (num_lines << v_zoom);

  530.                 }

  531.             }

  532. 

  533.             /* move to next horizontal block */

  534.             block     += 4 << h_zoom;

  535.             ref_block += 4 << h_zoom;

  536.         }

  537. 

  538.         /* move to next line of blocks */

  539.         ref_block += blk_row_offset;

  540.         block     += blk_row_offset;

  541.     }

  542.     return IV3_NOERR;

  543. }

  544. 

  545. 

  546. /**

  547.  *  Decode a vector-quantized cell.

  548.  *  It consists of several routines, each of which handles one or more "modes"

  549.  *  with which a cell can be encoded.

  550.  *

  551.  *  @param ctx      pointer to the decoder context

  552.  *  @param avctx    ptr to the AVCodecContext

  553.  *  @param plane    pointer to the plane descriptor

  554.  *  @param cell     pointer to the cell  descriptor

  555.  *  @param data_ptr pointer to the compressed data

  556.  *  @param last_ptr pointer to the last byte to catch reads past end of buffer

  557.  *  @return         number of consumed bytes or negative number in case of error

  558.  */

  559. static int decode_cell(Indeo3DecodeContext *ctx, AVCodecContext *avctx,

  560.                        Plane *plane, Cell *cell, const uint8_t *data_ptr,

  561.                        const uint8_t *last_ptr)

  562. {

  563.     int           x, mv_x, mv_y, mode, vq_index, prim_indx, second_indx;

  564.     int           zoom_fac;

  565.     int           offset, error = 0, swap_quads[2];

  566.     uint8_t       code, *block, *ref_block = 0;

  567.     const vqEntry *delta[2];

  568.     const uint8_t *data_start = data_ptr;

  569. 

  570.     /* get coding mode and VQ table index from the VQ descriptor byte */

  571.     code     = *data_ptr++;

  572.     mode     = code >> 4;

  573.     vq_index = code & 0xF;

  574. 

  575.     /* setup output and reference pointers */

  576.     offset = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);

  577.     block  =  plane->pixels[ctx->buf_sel] + offset;

  578.     if (!cell->mv_ptr) {

  579.         /* use previous line as reference for INTRA cells */

  580.         ref_block = block - plane->pitch;

  581.     } else if (mode >= 10) {

  582.         /* for mode 10 and 11 INTER first copy the predicted cell into the current one */

  583.         /* so we don't need to do data copying for each RLE code later */

  584.         copy_cell(ctx, plane, cell);

  585.     } else {

  586.         /* set the pointer to the reference pixels for modes 0-4 INTER */

  587.         mv_y      = cell->mv_ptr[0];

  588.         mv_x      = cell->mv_ptr[1];

  589.         offset   += mv_y * plane->pitch + mv_x;

  590.         ref_block = plane->pixels[ctx->buf_sel ^ 1] + offset;

  591.     }

  592. 

  593.     /* select VQ tables as follows: */

  594.     /* modes 0 and 3 use only the primary table for all lines in a block */

  595.     /* while modes 1 and 4 switch between primary and secondary tables on alternate lines */

  596.     if (mode == 1 || mode == 4) {

  597.         code        = ctx->alt_quant[vq_index];

  598.         prim_indx   = (code >> 4)  + ctx->cb_offset;

  599.         second_indx = (code & 0xF) + ctx->cb_offset;

  600.     } else {

  601.         vq_index += ctx->cb_offset;

  602.         prim_indx = second_indx = vq_index;

  603.     }

  604. 

  605.     if (prim_indx >= 24 || second_indx >= 24) {

  606.         av_log(avctx, AV_LOG_ERROR, "Invalid VQ table indexes! Primary: %d, secondary: %d!\n",

  607.                prim_indx, second_indx);

  608.         return AVERROR_INVALIDDATA;

  609.     }

  610. 

  611.     delta[0] = &vq_tab[second_indx];

  612.     delta[1] = &vq_tab[prim_indx];

  613.     swap_quads[0] = second_indx >= 16;

  614.     swap_quads[1] = prim_indx   >= 16;

  615. 

  616.     /* requantize the prediction if VQ index of this cell differs from VQ index */

  617.     /* of the predicted cell in order to avoid overflows. */

  618.     if (vq_index >= 8 && ref_block) {

  619.         for (x = 0; x < cell->width << 2; x++)

  620.             ref_block[x] = requant_tab[vq_index & 7][ref_block[x]];

  621.     }

  622. 

  623.     error = IV3_NOERR;

  624. 

  625.     switch (mode) {

  626.     case 0: /*------------------ MODES 0 & 1 (4x4 block processing) --------------------*/

  627.     case 1:

  628.     case 3: /*------------------ MODES 3 & 4 (4x8 block processing) --------------------*/

  629.     case 4:

  630.         if (mode >= 3 && cell->mv_ptr) {

  631.             av_log(avctx, AV_LOG_ERROR, "Attempt to apply Mode 3/4 to an INTER cell!\n");

  632.             return AVERROR_INVALIDDATA;

  633.         }

  634. 

  635.         zoom_fac = mode >= 3;

  636.         error = decode_cell_data(cell, block, ref_block, plane->pitch, 0, zoom_fac,

  637.                                  mode, delta, swap_quads, &data_ptr, last_ptr);

  638.         break;

  639.     case 10: /*-------------------- MODE 10 (8x8 block processing) ---------------------*/

  640.     case 11: /*----------------- MODE 11 (4x8 INTER block processing) ------------------*/

  641.         if (mode == 10 && !cell->mv_ptr) { /* MODE 10 INTRA processing */

  642.             error = decode_cell_data(cell, block, ref_block, plane->pitch, 1, 1,

  643.                                      mode, delta, swap_quads, &data_ptr, last_ptr);

  644.         } else { /* mode 10 and 11 INTER processing */

  645.             if (mode == 11 && !cell->mv_ptr) {

  646.                av_log(avctx, AV_LOG_ERROR, "Attempt to use Mode 11 for an INTRA cell!\n");

  647.                return AVERROR_INVALIDDATA;

  648.             }

  649. 

  650.             zoom_fac = mode == 10;

  651.             error = decode_cell_data(cell, block, ref_block, plane->pitch,

  652.                                      zoom_fac, 1, mode, delta, swap_quads,

  653.                                      &data_ptr, last_ptr);

  654.         }

  655.         break;

  656.     default:

  657.         av_log(avctx, AV_LOG_ERROR, "Unsupported coding mode: %d\n", mode);

  658.         return AVERROR_INVALIDDATA;

  659.     }//switch mode

  660. 

  661.     switch (error) {

  662.     case IV3_BAD_RLE:

  663.         av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE code %X is not allowed at the current line\n",

  664.                mode, data_ptr[-1]);

  665.         return AVERROR_INVALIDDATA;

  666.     case IV3_BAD_DATA:

  667.         av_log(avctx, AV_LOG_ERROR, "Mode %d: invalid VQ data\n", mode);

  668.         return AVERROR_INVALIDDATA;

  669.     case IV3_BAD_COUNTER:

  670.         av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE-FB invalid counter: %d\n", mode, code);

  671.         return AVERROR_INVALIDDATA;

  672.     case IV3_UNSUPPORTED:

  673.         av_log(avctx, AV_LOG_ERROR, "Mode %d: unsupported RLE code: %X\n", mode, data_ptr[-1]);

  674.         return AVERROR_INVALIDDATA;

  675.     case IV3_OUT_OF_DATA:

  676.         av_log(avctx, AV_LOG_ERROR, "Mode %d: attempt to read past end of buffer\n", mode);

  677.         return AVERROR_INVALIDDATA;

  678.     }

  679. 

  680.     return data_ptr - data_start; /* report number of bytes consumed from the input buffer */

  681. }

  682. 

  683. 

  684. /* Binary tree codes. */

  685. enum {

  686.     H_SPLIT    = 0,

  687.     V_SPLIT    = 1,

  688.     INTRA_NULL = 2,

  689.     INTER_DATA = 3

  690. };

  691. 

  692. 

  693. #define SPLIT_CELL(size, new_size) (new_size) = ((size) > 2) ? ((((size) + 2) >> 2) << 1) : 1

  694. 

  695. #define UPDATE_BITPOS(n) \

  696.     ctx->skip_bits  += (n); \

  697.     ctx->need_resync = 1

  698. 

  699. #define RESYNC_BITSTREAM \

  700.     if (ctx->need_resync && !(get_bits_count(&ctx->gb) & 7)) { \

  701.         skip_bits_long(&ctx->gb, ctx->skip_bits);              \

  702.         ctx->skip_bits   = 0;                                  \

  703.         ctx->need_resync = 0;                                  \

  704.     }

  705. 

  706. #define CHECK_CELL \

  707.     if (curr_cell.xpos + curr_cell.width > (plane->width >> 2) ||               \

  708.         curr_cell.ypos + curr_cell.height > (plane->height >> 2)) {             \

  709.         av_log(avctx, AV_LOG_ERROR, "Invalid cell: x=%d, y=%d, w=%d, h=%d\n",   \

  710.                curr_cell.xpos, curr_cell.ypos, curr_cell.width, curr_cell.height); \

  711.         return AVERROR_INVALIDDATA;                                                              \

  712.     }

  713. 

  714. 

  715. static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx,

  716.                          Plane *plane, int code, Cell *ref_cell,

  717.                          const int depth, const int strip_width)

  718. {

  719.     Cell    curr_cell;

  720.     int     bytes_used;

  721. 

  722.     if (depth <= 0) {

  723.         av_log(avctx, AV_LOG_ERROR, "Stack overflow (corrupted binary tree)!\n");

  724.         return AVERROR_INVALIDDATA; // unwind recursion

  725.     }

  726. 

  727.     curr_cell = *ref_cell; // clone parent cell

  728.     if (code == H_SPLIT) {

  729.         SPLIT_CELL(ref_cell->height, curr_cell.height);

  730.         ref_cell->ypos   += curr_cell.height;

  731.         ref_cell->height -= curr_cell.height;

  732.         if (ref_cell->height <= 0 || curr_cell.height <= 0)

  733.             return AVERROR_INVALIDDATA;

  734.     } else if (code == V_SPLIT) {

  735.         if (curr_cell.width > strip_width) {

  736.             /* split strip */

  737.             curr_cell.width = (curr_cell.width <= (strip_width << 1) ? 1 : 2) * strip_width;

  738.         } else

  739.             SPLIT_CELL(ref_cell->width, curr_cell.width);

  740.         ref_cell->xpos  += curr_cell.width;

  741.         ref_cell->width -= curr_cell.width;

  742.         if (ref_cell->width <= 0 || curr_cell.width <= 0)

  743.             return AVERROR_INVALIDDATA;

  744.     }

  745. 

  746.     while (1) { /* loop until return */

  747.         RESYNC_BITSTREAM;

  748.         switch (code = get_bits(&ctx->gb, 2)) {

  749.         case H_SPLIT:

  750.         case V_SPLIT:

  751.             if (parse_bintree(ctx, avctx, plane, code, &curr_cell, depth - 1, strip_width))

  752.                 return AVERROR_INVALIDDATA;

  753.             break;

  754.         case INTRA_NULL:

  755.             if (!curr_cell.tree) { /* MC tree INTRA code */

  756.                 curr_cell.mv_ptr = 0; /* mark the current strip as INTRA */

  757.                 curr_cell.tree   = 1; /* enter the VQ tree */

  758.             } else { /* VQ tree NULL code */

  759.                 RESYNC_BITSTREAM;

  760.                 code = get_bits(&ctx->gb, 2);

  761.                 if (code >= 2) {

  762.                     av_log(avctx, AV_LOG_ERROR, "Invalid VQ_NULL code: %d\n", code);

  763.                     return AVERROR_INVALIDDATA;

  764.                 }

  765.                 if (code == 1)

  766.                     av_log(avctx, AV_LOG_ERROR, "SkipCell procedure not implemented yet!\n");

  767. 

  768.                 CHECK_CELL

  769.                 if (!curr_cell.mv_ptr)

  770.                     return AVERROR_INVALIDDATA;

  771.                 copy_cell(ctx, plane, &curr_cell);

  772.                 return 0;

  773.             }

  774.             break;

  775.         case INTER_DATA:

  776.             if (!curr_cell.tree) { /* MC tree INTER code */

  777.                 unsigned mv_idx;

  778.                 /* get motion vector index and setup the pointer to the mv set */

  779.                 if (!ctx->need_resync)

  780.                     ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];

  781.                 mv_idx = *(ctx->next_cell_data++);

  782.                 if (mv_idx >= ctx->num_vectors) {

  783.                     av_log(avctx, AV_LOG_ERROR, "motion vector index out of range\n");

  784.                     return AVERROR_INVALIDDATA;

  785.                 }

  786.                 curr_cell.mv_ptr = &ctx->mc_vectors[mv_idx << 1];

  787.                 curr_cell.tree   = 1; /* enter the VQ tree */

  788.                 UPDATE_BITPOS(8);

  789.             } else { /* VQ tree DATA code */

  790.                 if (!ctx->need_resync)

  791.                     ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];

  792. 

  793.                 CHECK_CELL

  794.                 bytes_used = decode_cell(ctx, avctx, plane, &curr_cell,

  795.                                          ctx->next_cell_data, ctx->last_byte);

  796.                 if (bytes_used < 0)

  797.                     return AVERROR_INVALIDDATA;

  798. 

  799.                 UPDATE_BITPOS(bytes_used << 3);

  800.                 ctx->next_cell_data += bytes_used;

  801.                 return 0;

  802.             }

  803.             break;

  804.         }

  805.     }//while

  806. 

  807.     return 0;

  808. }

  809. 

  810. 

  811. static int decode_plane(Indeo3DecodeContext *ctx, AVCodecContext *avctx,

  812.                         Plane *plane, const uint8_t *data, int32_t data_size,

  813.                         int32_t strip_width)

  814. {

  815.     Cell            curr_cell;

  816.     unsigned        num_vectors;

  817. 

  818.     /* each plane data starts with mc_vector_count field, */

  819.     /* an optional array of motion vectors followed by the vq data */

  820.     num_vectors = bytestream_get_le32(&data);

  821.     if (num_vectors > 256) {

  822.         av_log(ctx->avctx, AV_LOG_ERROR,

  823.                "Read invalid number of motion vectors %d\n", num_vectors);

  824.         return AVERROR_INVALIDDATA;

  825.     }

  826.     if (num_vectors * 2 >= data_size)

  827.         return AVERROR_INVALIDDATA;

  828. 

  829.     ctx->num_vectors = num_vectors;

  830.     ctx->mc_vectors  = num_vectors ? data : 0;

  831. 

  832.     /* init the bitreader */

  833.     init_get_bits(&ctx->gb, &data[num_vectors * 2], (data_size - num_vectors * 2) << 3);

  834.     ctx->skip_bits   = 0;

  835.     ctx->need_resync = 0;

  836. 

  837.     ctx->last_byte = data + data_size - 1;

  838. 

  839.     /* initialize the 1st cell and set its dimensions to whole plane */

  840.     curr_cell.xpos   = curr_cell.ypos = 0;

  841.     curr_cell.width  = plane->width  >> 2;

  842.     curr_cell.height = plane->height >> 2;

  843.     curr_cell.tree   = 0; // we are in the MC tree now

  844.     curr_cell.mv_ptr = 0; // no motion vector = INTRA cell

  845. 

  846.     return parse_bintree(ctx, avctx, plane, INTRA_NULL, &curr_cell, CELL_STACK_MAX, strip_width);

  847. }

  848. 

  849. 

  850. #define OS_HDR_ID   MKBETAG('F', 'R', 'M', 'H')

  851. 

  852. static int decode_frame_headers(Indeo3DecodeContext *ctx, AVCodecContext *avctx,

  853.                                 const uint8_t *buf, int buf_size)

  854. {

  855.     const uint8_t   *buf_ptr = buf, *bs_hdr;

  856.     uint32_t        frame_num, word2, check_sum, data_size;

  857.     uint32_t        y_offset, u_offset, v_offset, starts[3], ends[3];

  858.     uint16_t        height, width;

  859.     int             i, j;

  860. 

  861.     /* parse and check the OS header */

  862.     frame_num = bytestream_get_le32(&buf_ptr);

  863.     word2     = bytestream_get_le32(&buf_ptr);

  864.     check_sum = bytestream_get_le32(&buf_ptr);

  865.     data_size = bytestream_get_le32(&buf_ptr);

  866. 

  867.     if ((frame_num ^ word2 ^ data_size ^ OS_HDR_ID) != check_sum) {

  868.         av_log(avctx, AV_LOG_ERROR, "OS header checksum mismatch!\n");

  869.         return AVERROR_INVALIDDATA;

  870.     }

  871. 

  872.     /* parse the bitstream header */

  873.     bs_hdr = buf_ptr;

  874. 

  875.     if (bytestream_get_le16(&buf_ptr) != 32) {

  876.         av_log(avctx, AV_LOG_ERROR, "Unsupported codec version!\n");

  877.         return AVERROR_INVALIDDATA;

  878.     }

  879. 

  880.     ctx->frame_num   =  frame_num;

  881.     ctx->frame_flags =  bytestream_get_le16(&buf_ptr);

  882.     ctx->data_size   = (bytestream_get_le32(&buf_ptr) + 7) >> 3;

  883.     ctx->cb_offset   = *buf_ptr++;

  884. 

  885.     if (ctx->data_size == 16)

  886.         return 4;

  887.     if (ctx->data_size > buf_size)

  888.         ctx->data_size = buf_size;

  889. 

  890.     buf_ptr += 3; // skip reserved byte and checksum

  891. 

  892.     /* check frame dimensions */

  893.     height = bytestream_get_le16(&buf_ptr);

  894.     width  = bytestream_get_le16(&buf_ptr);

  895.     if (av_image_check_size(width, height, 0, avctx))

  896.         return AVERROR_INVALIDDATA;

  897. 

  898.     if (width != ctx->width || height != ctx->height) {

  899.         int res;

  900. 

  901.         av_dlog(avctx, "Frame dimensions changed!\n");

  902. 

  903.         if (width  < 16 || width  > 640 ||

  904.             height < 16 || height > 480 ||

  905.             width  &  3 || height &   3) {

  906.             av_log(avctx, AV_LOG_ERROR,

  907.                    "Invalid picture dimensions: %d x %d!\n", width, height);

  908.             return AVERROR_INVALIDDATA;

  909.         }

  910. 

  911.         ctx->width  = width;

  912.         ctx->height = height;

  913. 

  914.         free_frame_buffers(ctx);

  915.         if ((res = allocate_frame_buffers(ctx, avctx)) < 0)

  916.              return res;

  917.         avcodec_set_dimensions(avctx, width, height);

  918.     }

  919. 

  920.     y_offset = bytestream_get_le32(&buf_ptr);

  921.     v_offset = bytestream_get_le32(&buf_ptr);

  922.     u_offset = bytestream_get_le32(&buf_ptr);

  923. 

  924.     /* unfortunately there is no common order of planes in the buffer */

  925.     /* so we use that sorting algo for determining planes data sizes  */

  926.     starts[0] = y_offset;

  927.     starts[1] = v_offset;

  928.     starts[2] = u_offset;

  929. 

  930.     for (j = 0; j < 3; j++) {

  931.         ends[j] = ctx->data_size;

  932.         for (i = 2; i >= 0; i--)

  933.             if (starts[i] < ends[j] && starts[i] > starts[j])

  934.                 ends[j] = starts[i];

  935.     }

  936. 

  937.     ctx->y_data_size = ends[0] - starts[0];

  938.     ctx->v_data_size = ends[1] - starts[1];

  939.     ctx->u_data_size = ends[2] - starts[2];

  940.     if (FFMAX3(y_offset, v_offset, u_offset) >= ctx->data_size - 16 ||

  941.         FFMIN3(ctx->y_data_size, ctx->v_data_size, ctx->u_data_size) <= 0) {

  942.         av_log(avctx, AV_LOG_ERROR, "One of the y/u/v offsets is invalid\n");

  943.         return AVERROR_INVALIDDATA;

  944.     }

  945. 

  946.     ctx->y_data_ptr = bs_hdr + y_offset;

  947.     ctx->v_data_ptr = bs_hdr + v_offset;

  948.     ctx->u_data_ptr = bs_hdr + u_offset;

  949.     ctx->alt_quant  = buf_ptr + sizeof(uint32_t);

  950. 

  951.     if (ctx->data_size == 16) {

  952.         av_log(avctx, AV_LOG_DEBUG, "Sync frame encountered!\n");

  953.         return 16;

  954.     }

  955. 

  956.     if (ctx->frame_flags & BS_8BIT_PEL) {

  957.         av_log_ask_for_sample(avctx, "8-bit pixel format\n");

  958.         return AVERROR_PATCHWELCOME;

  959.     }

  960. 

  961.     if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {

  962.         av_log_ask_for_sample(avctx, "halfpel motion vectors\n");

  963.         return AVERROR_PATCHWELCOME;

  964.     }

  965. 

  966.     return 0;

  967. }

  968. 

  969. 

  970. /**

  971.  *  Convert and output the current plane.

  972.  *  All pixel values will be upsampled by shifting right by one bit.

  973.  *

  974.  *  @param[in]  plane        pointer to the descriptor of the plane being processed

  975.  *  @param[in]  buf_sel      indicates which frame buffer the input data stored in

  976.  *  @param[out] dst          pointer to the buffer receiving converted pixels

  977.  *  @param[in]  dst_pitch    pitch for moving to the next y line

  978.  */

  979. static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst, int dst_pitch)

  980. {

  981.     int             x,y;

  982.     const uint8_t   *src  = plane->pixels[buf_sel];

  983.     uint32_t        pitch = plane->pitch;

  984. 

  985.     for (y = 0; y < plane->height; y++) {

  986.         /* convert four pixels at once using SWAR */

  987.         for (x = 0; x < plane->width >> 2; x++) {

  988.             AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);

  989.             src += 4;

  990.             dst += 4;

  991.         }

  992. 

  993.         for (x <<= 2; x < plane->width; x++)

  994.             *dst++ = *src++ << 1;

  995. 

  996.         src += pitch     - plane->width;

  997.         dst += dst_pitch - plane->width;

  998.     }

  999. }

  1000. 

  1001. 

  1002. static av_cold int decode_init(AVCodecContext *avctx)

  1003. {

  1004.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1005. 

  1006.     ctx->avctx     = avctx;

  1007.     ctx->width     = avctx->width;

  1008.     ctx->height    = avctx->height;

  1009.     avctx->pix_fmt = PIX_FMT_YUV410P;

  1010. 

  1011.     build_requant_tab();

  1012. 

  1013.     ff_dsputil_init(&ctx->dsp, avctx);

  1014. 

  1015.     allocate_frame_buffers(ctx, avctx);

  1016. 

  1017.     return 0;

  1018. }

  1019. 

  1020. 

  1021. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,

  1022.                         AVPacket *avpkt)

  1023. {

  1024.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1025.     const uint8_t *buf = avpkt->data;

  1026.     int buf_size       = avpkt->size;

  1027.     int res;

  1028. 

  1029.     res = decode_frame_headers(ctx, avctx, buf, buf_size);

  1030.     if (res < 0)

  1031.         return res;

  1032. 

  1033.     /* skip sync(null) frames */

  1034.     if (res) {

  1035.         // we have processed 16 bytes but no data was decoded

  1036.         *data_size = 0;

  1037.         return buf_size;

  1038.     }

  1039. 

  1040.     /* skip droppable INTER frames if requested */

  1041.     if (ctx->frame_flags & BS_NONREF &&

  1042.        (avctx->skip_frame >= AVDISCARD_NONREF))

  1043.         return 0;

  1044. 

  1045.     /* skip INTER frames if requested */

  1046.     if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)

  1047.         return 0;

  1048. 

  1049.     /* use BS_BUFFER flag for buffer switching */

  1050.     ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;

  1051. 

  1052.     /* decode luma plane */

  1053.     if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))

  1054.         return res;

  1055. 

  1056.     /* decode chroma planes */

  1057.     if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))

  1058.         return res;

  1059. 

  1060.     if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))

  1061.         return res;

  1062. 

  1063.     if (ctx->frame.data[0])

  1064.         avctx->release_buffer(avctx, &ctx->frame);

  1065. 

  1066.     ctx->frame.reference = 0;

  1067.     if ((res = avctx->get_buffer(avctx, &ctx->frame)) < 0) {

  1068.         av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1069.         return res;

  1070.     }

  1071. 

  1072.     output_plane(&ctx->planes[0], ctx->buf_sel, ctx->frame.data[0], ctx->frame.linesize[0]);

  1073.     output_plane(&ctx->planes[1], ctx->buf_sel, ctx->frame.data[1], ctx->frame.linesize[1]);

  1074.     output_plane(&ctx->planes[2], ctx->buf_sel, ctx->frame.data[2], ctx->frame.linesize[2]);

  1075. 

  1076.     *data_size      = sizeof(AVFrame);

  1077.     *(AVFrame*)data = ctx->frame;

  1078. 

  1079.     return buf_size;

  1080. }

  1081. 

  1082. 

  1083. static av_cold int decode_close(AVCodecContext *avctx)

  1084. {

  1085.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1086. 

  1087.     free_frame_buffers(avctx->priv_data);

  1088. 

  1089.     if (ctx->frame.data[0])

  1090.         avctx->release_buffer(avctx, &ctx->frame);

  1091. 

  1092.     return 0;

  1093. }

  1094. 

  1095. AVCodec ff_indeo3_decoder = {

  1096.     .name           = "indeo3",

  1097.     .type           = AVMEDIA_TYPE_VIDEO,

  1098.     .id             = CODEC_ID_INDEO3,

  1099.     .priv_data_size = sizeof(Indeo3DecodeContext),

  1100.     .init           = decode_init,

  1101.     .close          = decode_close,

  1102.     .decode         = decode_frame,

  1103.     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),

  1104. };