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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 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.  * 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 "copy_block.h"

  36. #include "dsputil.h"

  37. #include "bytestream.h"

  38. #include "get_bits.h"

  39. #include "internal.h"

  40. 

  41. #include "indeo3data.h"

  42. 

  43. /* RLE opcodes. */

  44. enum {

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

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

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

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

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

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

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

  52. };

  53. 

  54. 

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

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

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

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

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

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

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

  62. 

  63. 

  64. typedef struct Plane {

  65.     uint8_t         *buffers[2];

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

  67.     uint32_t        width;

  68.     uint32_t        height;

  69.     uint32_t        pitch;

  70. } Plane;

  71. 

  72. #define CELL_STACK_MAX  20

  73. 

  74. typedef struct Cell {

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

  76.     int16_t         ypos;

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

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

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

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

  81. } Cell;

  82. 

  83. typedef struct Indeo3DecodeContext {

  84.     AVCodecContext *avctx;

  85.     AVFrame         frame;

  86.     DSPContext      dsp;

  87. 

  88.     GetBitContext   gb;

  89.     int             need_resync;

  90.     int             skip_bits;

  91.     const uint8_t   *next_cell_data;

  92.     const uint8_t   *last_byte;

  93.     const int8_t    *mc_vectors;

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

  95. 

  96.     int16_t         width, height;

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

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

  99.     uint16_t        frame_flags;    ///< frame properties

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

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

  102.     const uint8_t   *y_data_ptr;

  103.     const uint8_t   *v_data_ptr;

  104.     const uint8_t   *u_data_ptr;

  105.     int32_t         y_data_size;

  106.     int32_t         v_data_size;

  107.     int32_t         u_data_size;

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

  109.     Plane           planes[3];

  110. } Indeo3DecodeContext;

  111. 

  112. 

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

  114. 

  115. /*

  116.  *  Build the static requantization table.

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

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

  119.  */

  120. static av_cold void build_requant_tab(void)

  121. {

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

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

  124. 

  125.     int i, j, step;

  126. 

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

  128.         step = i + 2;

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

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

  131.     }

  132. 

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

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

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

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

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

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

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

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

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

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

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

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

  145. 

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

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

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

  149. }

  150. 

  151. 

  152. static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,

  153.                                           AVCodecContext *avctx, int luma_width, int luma_height)

  154. {

  155.     int p, chroma_width, chroma_height;

  156.     int luma_pitch, chroma_pitch, luma_size, chroma_size;

  157. 

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

  159.         luma_height < 16 || luma_height > 480 ||

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

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

  162.                luma_width, luma_height);

  163.         return AVERROR_INVALIDDATA;

  164.     }

  165. 

  166.     ctx->width  = luma_width ;

  167.     ctx->height = luma_height;

  168. 

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

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

  171. 

  172.     luma_pitch   = FFALIGN(luma_width,   16);

  173.     chroma_pitch = FFALIGN(chroma_width, 16);

  174. 

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

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

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

  178. 

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

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

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

  182. 

  183.     /* allocate frame buffers */

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

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

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

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

  188. 

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

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

  191. 

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

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

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

  195. 

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

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

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

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

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

  201.     }

  202. 

  203.     return 0;

  204. }

  205. 

  206. 

  207. static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx)

  208. {

  209.     int p;

  210. 

  211.     ctx->width=

  212.     ctx->height= 0;

  213. 

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

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

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

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

  218.     }

  219. }

  220. 

  221. 

  222. /**

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

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

  225.  *

  226.  *  @param ctx      pointer to the decoder context

  227.  *  @param plane    pointer to the plane descriptor

  228.  *  @param cell     pointer to the cell  descriptor

  229.  */

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

  231. {

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

  233.     uint8_t *src, *dst;

  234. 

  235.     /* setup output and reference pointers */

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

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

  238.     if(cell->mv_ptr){

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

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

  241.     }else

  242.         mv_x= mv_y= 0;

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

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

  245. 

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

  247. 

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

  249.         /* copy using 16xH blocks */

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

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

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

  253.         }

  254. 

  255.         /* copy using 8xH blocks */

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

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

  258.             w -= 2;

  259.             src += 8;

  260.             dst += 8;

  261.         }

  262. 

  263.         if (w >= 1) {

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

  265.             w--;

  266.             src += 4;

  267.             dst += 4;

  268.         }

  269.     }

  270. }

  271. 

  272. 

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

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

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

  276. 

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

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

  279. 

  280. 

  281. /*

  282.  *  Replicate each even pixel as follows:

  283.  *  ABCDEFGH -> AACCEEGG

  284.  */

  285. static inline uint64_t replicate64(uint64_t a) {

  286. #if HAVE_BIGENDIAN

  287.     a &= 0xFF00FF00FF00FF00ULL;

  288.     a |= a >> 8;

  289. #else

  290.     a &= 0x00FF00FF00FF00FFULL;

  291.     a |= a << 8;

  292. #endif

  293.     return a;

  294. }

  295. 

  296. static inline uint32_t replicate32(uint32_t a) {

  297. #if HAVE_BIGENDIAN

  298.     a &= 0xFF00FF00UL;

  299.     a |= a >> 8;

  300. #else

  301.     a &= 0x00FF00FFUL;

  302.     a |= a << 8;

  303. #endif

  304.     return a;

  305. }

  306. 

  307. 

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

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

  310.                            int32_t row_offset)

  311. {

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

  313.         AV_WN64A(dst, pix);

  314. }

  315. 

  316. 

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

  318. enum {

  319.     IV3_NOERR       = 0,

  320.     IV3_BAD_RLE     = 1,

  321.     IV3_BAD_DATA    = 2,

  322.     IV3_BAD_COUNTER = 3,

  323.     IV3_UNSUPPORTED = 4,

  324.     IV3_OUT_OF_DATA = 5

  325. };

  326. 

  327. 

  328. #define BUFFER_PRECHECK \

  329. if (*data_ptr >= last_ptr) \

  330.     return IV3_OUT_OF_DATA; \

  331. 

  332. #define RLE_BLOCK_COPY \

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

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

  335. 

  336. #define RLE_BLOCK_COPY_8 \

  337.     pix64 = AV_RN64A(ref);\

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

  339.         pix64 = replicate64(pix64);\

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

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

  342.     } else \

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

  344. 

  345. #define RLE_LINES_COPY \

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

  347. 

  348. #define RLE_LINES_COPY_M10 \

  349.     pix64 = AV_RN64A(ref);\

  350.     if (is_top_of_cell) {\

  351.         pix64 = replicate64(pix64);\

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

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

  354.     } else \

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

  356. 

  357. #define APPLY_DELTA_4 \

  358.     AV_WN16A(dst + line_offset    ,\

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

  360.     AV_WN16A(dst + line_offset + 2,\

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

  362.     if (mode >= 3) {\

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

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

  365.         } else {\

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

  367.         }\

  368.     }

  369. 

  370. #define APPLY_DELTA_8 \

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

  372.     if (is_top_of_cell) { \

  373.         AV_WN32A(dst + row_offset    , \

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

  375.         AV_WN32A(dst + row_offset + 4, \

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

  377.     } else { \

  378.         AV_WN32A(dst + row_offset    , \

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

  380.         AV_WN32A(dst + row_offset + 4, \

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

  382.     } \

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

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

  385.     /* otherwise - interpolate */\

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

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

  388.     } else \

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

  390. 

  391. 

  392. #define APPLY_DELTA_1011_INTER \

  393.     if (mode == 10) { \

  394.         AV_WN32A(dst                 , \

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

  396.         AV_WN32A(dst + 4             , \

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

  398.         AV_WN32A(dst + row_offset    , \

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

  400.         AV_WN32A(dst + row_offset + 4, \

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

  402.     } else { \

  403.         AV_WN16A(dst                 , \

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

  405.         AV_WN16A(dst + 2             , \

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

  407.         AV_WN16A(dst + row_offset    , \

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

  409.         AV_WN16A(dst + row_offset + 2, \

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

  411.     }

  412. 

  413. 

  414. static int decode_cell_data(Indeo3DecodeContext *ctx, Cell *cell,

  415.                             uint8_t *block, uint8_t *ref_block,

  416.                             int pitch, int h_zoom, int v_zoom, int mode,

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

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

  419. {

  420.     int           x, y, line, num_lines;

  421.     int           rle_blocks = 0;

  422.     uint8_t       code, *dst, *ref;

  423.     const vqEntry *delta_tab;

  424.     unsigned int  dyad1, dyad2;

  425.     uint64_t      pix64;

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

  427.     int           row_offset, blk_row_offset, line_offset;

  428. 

  429.     row_offset     =  pitch;

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

  431.     line_offset    = v_zoom ? row_offset : 0;

  432. 

  433.     if (cell->height & v_zoom || cell->width & h_zoom)

  434.         return IV3_BAD_DATA;

  435. 

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

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

  438.             ref = ref_block;

  439.             dst = block;

  440. 

  441.             if (rle_blocks > 0) {

  442.                 if (mode <= 4) {

  443.                     RLE_BLOCK_COPY;

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

  445.                     RLE_BLOCK_COPY_8;

  446.                 }

  447.                 rle_blocks--;

  448.             } else {

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

  450.                     num_lines = 1;

  451.                     is_top_of_cell = is_first_row && !line;

  452. 

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

  454.                     if (mode <= 4)

  455.                         delta_tab = delta[line & 1];

  456.                     else

  457.                         delta_tab = delta[1];

  458.                     BUFFER_PRECHECK;

  459.                     code = bytestream_get_byte(data_ptr);

  460.                     if (code < 248) {

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

  462.                             BUFFER_PRECHECK;

  463.                             dyad1 = bytestream_get_byte(data_ptr);

  464.                             dyad2 = code;

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

  466.                                 return IV3_BAD_DATA;

  467.                         } else {

  468.                             /* process QUADS */

  469.                             code -= delta_tab->num_dyads;

  470.                             dyad1 = code / delta_tab->quad_exp;

  471.                             dyad2 = code % delta_tab->quad_exp;

  472.                             if (swap_quads[line & 1])

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

  474.                         }

  475.                         if (mode <= 4) {

  476.                             APPLY_DELTA_4;

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

  478.                             APPLY_DELTA_8;

  479.                         } else {

  480.                             APPLY_DELTA_1011_INTER;

  481.                         }

  482.                     } else {

  483.                         /* process RLE codes */

  484.                         switch (code) {

  485.                         case RLE_ESC_FC:

  486.                             skip_flag  = 0;

  487.                             rle_blocks = 1;

  488.                             code       = 253;

  489.                             /* FALLTHROUGH */

  490.                         case RLE_ESC_FF:

  491.                         case RLE_ESC_FE:

  492.                         case RLE_ESC_FD:

  493.                             num_lines = 257 - code - line;

  494.                             if (num_lines <= 0)

  495.                                 return IV3_BAD_RLE;

  496.                             if (mode <= 4) {

  497.                                 RLE_LINES_COPY;

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

  499.                                 RLE_LINES_COPY_M10;

  500.                             }

  501.                             break;

  502.                         case RLE_ESC_FB:

  503.                             BUFFER_PRECHECK;

  504.                             code = bytestream_get_byte(data_ptr);

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

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

  507.                                 return IV3_BAD_COUNTER;

  508.                             skip_flag = code & 0x20;

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

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

  511.                                 if (mode <= 4) {

  512.                                     RLE_LINES_COPY;

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

  514.                                     RLE_LINES_COPY_M10;

  515.                                 }

  516.                             }

  517.                             break;

  518.                         case RLE_ESC_F9:

  519.                             skip_flag  = 1;

  520.                             rle_blocks = 1;

  521.                             /* FALLTHROUGH */

  522.                         case RLE_ESC_FA:

  523.                             if (line)

  524.                                 return IV3_BAD_RLE;

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

  526.                             if (cell->mv_ptr) {

  527.                                 if (mode <= 4) {

  528.                                     RLE_LINES_COPY;

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

  530.                                     RLE_LINES_COPY_M10;

  531.                                 }

  532.                             }

  533.                             break;

  534.                         default:

  535.                             return IV3_UNSUPPORTED;

  536.                         }

  537.                     }

  538. 

  539.                     line += num_lines;

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

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

  542.                 }

  543.             }

  544. 

  545.             /* move to next horizontal block */

  546.             block     += 4 << h_zoom;

  547.             ref_block += 4 << h_zoom;

  548.         }

  549. 

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

  551.         ref_block += blk_row_offset;

  552.         block     += blk_row_offset;

  553.     }

  554.     return IV3_NOERR;

  555. }

  556. 

  557. 

  558. /**

  559.  *  Decode a vector-quantized cell.

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

  561.  *  with which a cell can be encoded.

  562.  *

  563.  *  @param ctx      pointer to the decoder context

  564.  *  @param avctx    ptr to the AVCodecContext

  565.  *  @param plane    pointer to the plane descriptor

  566.  *  @param cell     pointer to the cell  descriptor

  567.  *  @param data_ptr pointer to the compressed data

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

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

  570.  */

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

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

  573.                        const uint8_t *last_ptr)

  574. {

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

  576.     int           zoom_fac;

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

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

  579.     const vqEntry *delta[2];

  580.     const uint8_t *data_start = data_ptr;

  581. 

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

  583.     code     = *data_ptr++;

  584.     mode     = code >> 4;

  585.     vq_index = code & 0xF;

  586. 

  587.     /* setup output and reference pointers */

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

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

  590. 

  591.     if (cell->mv_ptr) {

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

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

  594.         if (   mv_x + 4*cell->xpos < 0

  595.             || mv_y + 4*cell->ypos < 0

  596.             || mv_x + 4*cell->xpos + 4*cell->width  > plane->width

  597.             || mv_y + 4*cell->ypos + 4*cell->height > plane->height) {

  598.             av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", mv_x + 4*cell->xpos, mv_y + 4*cell->ypos);

  599.             return AVERROR_INVALIDDATA;

  600.         }

  601.     }

  602. 

  603.     if (!cell->mv_ptr) {

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

  605.         ref_block = block - plane->pitch;

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

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

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

  609.         copy_cell(ctx, plane, cell);

  610.     } else {

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

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

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

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

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

  616.     }

  617. 

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

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

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

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

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

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

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

  625.     } else {

  626.         vq_index += ctx->cb_offset;

  627.         prim_indx = second_indx = vq_index;

  628.     }

  629. 

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

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

  632.                prim_indx, second_indx);

  633.         return AVERROR_INVALIDDATA;

  634.     }

  635. 

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

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

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

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

  640. 

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

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

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

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

  645.             ref_block[x] = requant_tab[vq_index & 7][ref_block[x] & 127];

  646.     }

  647. 

  648.     error = IV3_NOERR;

  649. 

  650.     switch (mode) {

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

  652.     case 1:

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

  654.     case 4:

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

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

  657.             return AVERROR_INVALIDDATA;

  658.         }

  659. 

  660.         zoom_fac = mode >= 3;

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

  662.                                  0, zoom_fac, mode, delta, swap_quads,

  663.                                  &data_ptr, last_ptr);

  664.         break;

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

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

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

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

  669.                                      1, 1, mode, delta, swap_quads,

  670.                                      &data_ptr, last_ptr);

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

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

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

  674.                return AVERROR_INVALIDDATA;

  675.             }

  676. 

  677.             zoom_fac = mode == 10;

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

  679.                                      zoom_fac, 1, mode, delta, swap_quads,

  680.                                      &data_ptr, last_ptr);

  681.         }

  682.         break;

  683.     default:

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

  685.         return AVERROR_INVALIDDATA;

  686.     }//switch mode

  687. 

  688.     switch (error) {

  689.     case IV3_BAD_RLE:

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

  691.                mode, data_ptr[-1]);

  692.         return AVERROR_INVALIDDATA;

  693.     case IV3_BAD_DATA:

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

  695.         return AVERROR_INVALIDDATA;

  696.     case IV3_BAD_COUNTER:

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

  698.         return AVERROR_INVALIDDATA;

  699.     case IV3_UNSUPPORTED:

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

  701.         return AVERROR_INVALIDDATA;

  702.     case IV3_OUT_OF_DATA:

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

  704.         return AVERROR_INVALIDDATA;

  705.     }

  706. 

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

  708. }

  709. 

  710. 

  711. /* Binary tree codes. */

  712. enum {

  713.     H_SPLIT    = 0,

  714.     V_SPLIT    = 1,

  715.     INTRA_NULL = 2,

  716.     INTER_DATA = 3

  717. };

  718. 

  719. 

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

  721. 

  722. #define UPDATE_BITPOS(n) \

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

  724.     ctx->need_resync = 1

  725. 

  726. #define RESYNC_BITSTREAM \

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

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

  729.         ctx->skip_bits   = 0;                                  \

  730.         ctx->need_resync = 0;                                  \

  731.     }

  732. 

  733. #define CHECK_CELL \

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

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

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

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

  738.         return AVERROR_INVALIDDATA;                                                              \

  739.     }

  740. 

  741. 

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

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

  744.                          const int depth, const int strip_width)

  745. {

  746.     Cell    curr_cell;

  747.     int     bytes_used;

  748.     int mv_x, mv_y;

  749. 

  750.     if (depth <= 0) {

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

  752.         return AVERROR_INVALIDDATA; // unwind recursion

  753.     }

  754. 

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

  756.     if (code == H_SPLIT) {

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

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

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

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

  761.             return AVERROR_INVALIDDATA;

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

  763.         if (curr_cell.width > strip_width) {

  764.             /* split strip */

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

  766.         } else

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

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

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

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

  771.             return AVERROR_INVALIDDATA;

  772.     }

  773. 

  774.     while (get_bits_left(&ctx->gb) >= 2) { /* loop until return */

  775.         RESYNC_BITSTREAM;

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

  777.         case H_SPLIT:

  778.         case V_SPLIT:

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

  780.                 return AVERROR_INVALIDDATA;

  781.             break;

  782.         case INTRA_NULL:

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

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

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

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

  787.                 RESYNC_BITSTREAM;

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

  789.                 if (code >= 2) {

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

  791.                     return AVERROR_INVALIDDATA;

  792.                 }

  793.                 if (code == 1)

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

  795. 

  796.                 CHECK_CELL

  797.                 if (!curr_cell.mv_ptr)

  798.                     return AVERROR_INVALIDDATA;

  799. 

  800.                 mv_y = curr_cell.mv_ptr[0];

  801.                 mv_x = curr_cell.mv_ptr[1];

  802.                 if (   mv_x + 4*curr_cell.xpos < 0

  803.                     || mv_y + 4*curr_cell.ypos < 0

  804.                     || mv_x + 4*curr_cell.xpos + 4*curr_cell.width  > plane->width

  805.                     || mv_y + 4*curr_cell.ypos + 4*curr_cell.height > plane->height) {

  806.                     av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", mv_x + 4*curr_cell.xpos, mv_y + 4*curr_cell.ypos);

  807.                     return AVERROR_INVALIDDATA;

  808.                 }

  809. 

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

  811.                 return 0;

  812.             }

  813.             break;

  814.         case INTER_DATA:

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

  816.                 unsigned mv_idx;

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

  818.                 if (!ctx->need_resync)

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

  820.                 if (ctx->next_cell_data >= ctx->last_byte) {

  821.                     av_log(avctx, AV_LOG_ERROR, "motion vector out of array\n");

  822.                     return AVERROR_INVALIDDATA;

  823.                 }

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

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

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

  827.                     return AVERROR_INVALIDDATA;

  828.                 }

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

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

  831.                 UPDATE_BITPOS(8);

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

  833.                 if (!ctx->need_resync)

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

  835. 

  836.                 CHECK_CELL

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

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

  839.                 if (bytes_used < 0)

  840.                     return AVERROR_INVALIDDATA;

  841. 

  842.                 UPDATE_BITPOS(bytes_used << 3);

  843.                 ctx->next_cell_data += bytes_used;

  844.                 return 0;

  845.             }

  846.             break;

  847.         }

  848.     }//while

  849. 

  850.     return AVERROR_INVALIDDATA;

  851. }

  852. 

  853. 

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

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

  856.                         int32_t strip_width)

  857. {

  858.     Cell            curr_cell;

  859.     unsigned        num_vectors;

  860. 

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

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

  863.     num_vectors = bytestream_get_le32(&data); data_size -= 4;

  864.     if (num_vectors > 256) {

  865.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  867.         return AVERROR_INVALIDDATA;

  868.     }

  869.     if (num_vectors * 2 > data_size)

  870.         return AVERROR_INVALIDDATA;

  871. 

  872.     ctx->num_vectors = num_vectors;

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

  874. 

  875.     /* init the bitreader */

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

  877.     ctx->skip_bits   = 0;

  878.     ctx->need_resync = 0;

  879. 

  880.     ctx->last_byte = data + data_size;

  881. 

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

  883.     curr_cell.xpos   = curr_cell.ypos = 0;

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

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

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

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

  888. 

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

  890. }

  891. 

  892. 

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

  894. 

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

  896.                                 const uint8_t *buf, int buf_size)

  897. {

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

  899.     uint32_t        frame_num, word2, check_sum, data_size;

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

  901.     uint16_t        height, width;

  902.     int             i, j;

  903. 

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

  905.     frame_num = bytestream_get_le32(&buf_ptr);

  906.     word2     = bytestream_get_le32(&buf_ptr);

  907.     check_sum = bytestream_get_le32(&buf_ptr);

  908.     data_size = bytestream_get_le32(&buf_ptr);

  909. 

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

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

  912.         return AVERROR_INVALIDDATA;

  913.     }

  914. 

  915.     /* parse the bitstream header */

  916.     bs_hdr = buf_ptr;

  917.     buf_size -= 16;

  918. 

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

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

  921.         return AVERROR_INVALIDDATA;

  922.     }

  923. 

  924.     ctx->frame_num   =  frame_num;

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

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

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

  928. 

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

  930.         return 4;

  931.     if (ctx->data_size > buf_size)

  932.         ctx->data_size = buf_size;

  933. 

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

  935. 

  936.     /* check frame dimensions */

  937.     height = bytestream_get_le16(&buf_ptr);

  938.     width  = bytestream_get_le16(&buf_ptr);

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

  940.         return AVERROR_INVALIDDATA;

  941. 

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

  943.         int res;

  944. 

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

  946. 

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

  948.             height < 16 || height > 480 ||

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

  950.             av_log(avctx, AV_LOG_ERROR,

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

  952.             return AVERROR_INVALIDDATA;

  953.         }

  954.         free_frame_buffers(ctx);

  955.         if ((res = allocate_frame_buffers(ctx, avctx, width, height)) < 0)

  956.              return res;

  957.         avcodec_set_dimensions(avctx, width, height);

  958.     }

  959. 

  960.     y_offset = bytestream_get_le32(&buf_ptr);

  961.     v_offset = bytestream_get_le32(&buf_ptr);

  962.     u_offset = bytestream_get_le32(&buf_ptr);

  963. 

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

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

  966.     starts[0] = y_offset;

  967.     starts[1] = v_offset;

  968.     starts[2] = u_offset;

  969. 

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

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

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

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

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

  975.     }

  976. 

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

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

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

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

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

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

  983.         return AVERROR_INVALIDDATA;

  984.     }

  985. 

  986.     ctx->y_data_ptr = bs_hdr + y_offset;

  987.     ctx->v_data_ptr = bs_hdr + v_offset;

  988.     ctx->u_data_ptr = bs_hdr + u_offset;

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

  990. 

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

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

  993.         return 16;

  994.     }

  995. 

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

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

  998.         return AVERROR_PATCHWELCOME;

  999.     }

  1000. 

  1001.     if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {

  1002.         av_log_ask_for_sample(avctx, "halfpel motion vectors\n");

  1003.         return AVERROR_PATCHWELCOME;

  1004.     }

  1005. 

  1006.     return 0;

  1007. }

  1008. 

  1009. 

  1010. /**

  1011.  *  Convert and output the current plane.

  1012.  *  All pixel values will be upsampled by shifting right by one bit.

  1013.  *

  1014.  *  @param[in]  plane        pointer to the descriptor of the plane being processed

  1015.  *  @param[in]  buf_sel      indicates which frame buffer the input data stored in

  1016.  *  @param[out] dst          pointer to the buffer receiving converted pixels

  1017.  *  @param[in]  dst_pitch    pitch for moving to the next y line

  1018.  *  @param[in]  dst_height   output plane height

  1019.  */

  1020. static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst,

  1021.                          int dst_pitch, int dst_height)

  1022. {

  1023.     int             x,y;

  1024.     const uint8_t   *src  = plane->pixels[buf_sel];

  1025.     uint32_t        pitch = plane->pitch;

  1026. 

  1027.     dst_height = FFMIN(dst_height, plane->height);

  1028.     for (y = 0; y < dst_height; y++) {

  1029.         /* convert four pixels at once using SWAR */

  1030.         for (x = 0; x < plane->width >> 2; x++) {

  1031.             AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);

  1032.             src += 4;

  1033.             dst += 4;

  1034.         }

  1035. 

  1036.         for (x <<= 2; x < plane->width; x++)

  1037.             *dst++ = *src++ << 1;

  1038. 

  1039.         src += pitch     - plane->width;

  1040.         dst += dst_pitch - plane->width;

  1041.     }

  1042. }

  1043. 

  1044. 

  1045. static av_cold int decode_init(AVCodecContext *avctx)

  1046. {

  1047.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1048. 

  1049.     ctx->avctx     = avctx;

  1050.     avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  1051.     avcodec_get_frame_defaults(&ctx->frame);

  1052. 

  1053.     build_requant_tab();

  1054. 

  1055.     ff_dsputil_init(&ctx->dsp, avctx);

  1056. 

  1057.     return allocate_frame_buffers(ctx, avctx, avctx->width, avctx->height);

  1058. }

  1059. 

  1060. 

  1061. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  1062.                         AVPacket *avpkt)

  1063. {

  1064.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1065.     const uint8_t *buf = avpkt->data;

  1066.     int buf_size       = avpkt->size;

  1067.     int res;

  1068. 

  1069.     res = decode_frame_headers(ctx, avctx, buf, buf_size);

  1070.     if (res < 0)

  1071.         return res;

  1072. 

  1073.     /* skip sync(null) frames */

  1074.     if (res) {

  1075.         // we have processed 16 bytes but no data was decoded

  1076.         *got_frame = 0;

  1077.         return buf_size;

  1078.     }

  1079. 

  1080.     /* skip droppable INTER frames if requested */

  1081.     if (ctx->frame_flags & BS_NONREF &&

  1082.        (avctx->skip_frame >= AVDISCARD_NONREF))

  1083.         return 0;

  1084. 

  1085.     /* skip INTER frames if requested */

  1086.     if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)

  1087.         return 0;

  1088. 

  1089.     /* use BS_BUFFER flag for buffer switching */

  1090.     ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;

  1091. 

  1092.     if (ctx->frame.data[0])

  1093.         avctx->release_buffer(avctx, &ctx->frame);

  1094. 

  1095.     ctx->frame.reference = 0;

  1096.     if ((res = ff_get_buffer(avctx, &ctx->frame)) < 0) {

  1097.         av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1098.         return res;

  1099.     }

  1100. 

  1101.     /* decode luma plane */

  1102.     if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))

  1103.         return res;

  1104. 

  1105.     /* decode chroma planes */

  1106.     if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))

  1107.         return res;

  1108. 

  1109.     if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))

  1110.         return res;

  1111. 

  1112.     output_plane(&ctx->planes[0], ctx->buf_sel,

  1113.                  ctx->frame.data[0], ctx->frame.linesize[0],

  1114.                  avctx->height);

  1115.     output_plane(&ctx->planes[1], ctx->buf_sel,

  1116.                  ctx->frame.data[1], ctx->frame.linesize[1],

  1117.                  (avctx->height + 3) >> 2);

  1118.     output_plane(&ctx->planes[2], ctx->buf_sel,

  1119.                  ctx->frame.data[2], ctx->frame.linesize[2],

  1120.                  (avctx->height + 3) >> 2);

  1121. 

  1122.     *got_frame = 1;

  1123.     *(AVFrame*)data = ctx->frame;

  1124. 

  1125.     return buf_size;

  1126. }

  1127. 

  1128. 

  1129. static av_cold int decode_close(AVCodecContext *avctx)

  1130. {

  1131.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1132. 

  1133.     free_frame_buffers(avctx->priv_data);

  1134. 

  1135.     if (ctx->frame.data[0])

  1136.         avctx->release_buffer(avctx, &ctx->frame);

  1137. 

  1138.     return 0;

  1139. }

  1140. 

  1141. AVCodec ff_indeo3_decoder = {

  1142.     .name           = "indeo3",

  1143.     .type           = AVMEDIA_TYPE_VIDEO,

  1144.     .id             = AV_CODEC_ID_INDEO3,

  1145.     .priv_data_size = sizeof(Indeo3DecodeContext),

  1146.     .init           = decode_init,

  1147.     .close          = decode_close,

  1148.     .decode         = decode_frame,

  1149.     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),

  1150.     .capabilities   = CODEC_CAP_DR1,

  1151. };