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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 "bytestream.h"

  37. #include "get_bits.h"

  38. #include "hpeldsp.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.     HpelDSPContext  hdsp;

  86. 

  87.     GetBitContext   gb;

  88.     int             need_resync;

  89.     int             skip_bits;

  90.     const uint8_t   *next_cell_data;

  91.     const uint8_t   *last_byte;

  92.     const int8_t    *mc_vectors;

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

  94. 

  95.     int16_t         width, height;

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

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

  98.     uint16_t        frame_flags;    ///< frame properties

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

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

  101.     const uint8_t   *y_data_ptr;

  102.     const uint8_t   *v_data_ptr;

  103.     const uint8_t   *u_data_ptr;

  104.     int32_t         y_data_size;

  105.     int32_t         v_data_size;

  106.     int32_t         u_data_size;

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

  108.     Plane           planes[3];

  109. } Indeo3DecodeContext;

  110. 

  111. 

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

  113. 

  114. /*

  115.  *  Build the static requantization table.

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

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

  118.  */

  119. static av_cold void build_requant_tab(void)

  120. {

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

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

  123. 

  124.     int i, j, step;

  125. 

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

  127.         step = i + 2;

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

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

  130.     }

  131. 

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

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

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

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

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

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

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

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

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

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

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

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

  144. 

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

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

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

  148. }

  149. 

  150. 

  151. static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,

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

  153. {

  154.     int p, chroma_width, chroma_height;

  155.     int luma_pitch, chroma_pitch, luma_size, chroma_size;

  156. 

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

  158.         luma_height < 16 || luma_height > 480 ||

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

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

  161.                luma_width, luma_height);

  162.         return AVERROR_INVALIDDATA;

  163.     }

  164. 

  165.     ctx->width  = luma_width ;

  166.     ctx->height = luma_height;

  167. 

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

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

  170. 

  171.     luma_pitch   = FFALIGN(luma_width,   16);

  172.     chroma_pitch = FFALIGN(chroma_width, 16);

  173. 

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

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

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

  177. 

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

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

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

  181. 

  182.     /* allocate frame buffers */

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

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

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

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

  187. 

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

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

  190. 

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

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

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

  194. 

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

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

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

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

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

  200.     }

  201. 

  202.     return 0;

  203. }

  204. 

  205. 

  206. static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx)

  207. {

  208.     int p;

  209. 

  210.     ctx->width=

  211.     ctx->height= 0;

  212. 

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

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

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

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

  217.     }

  218. }

  219. 

  220. 

  221. /**

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

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

  224.  *

  225.  *  @param ctx      pointer to the decoder context

  226.  *  @param plane    pointer to the plane descriptor

  227.  *  @param cell     pointer to the cell  descriptor

  228.  */

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

  230. {

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

  232.     uint8_t *src, *dst;

  233. 

  234.     /* setup output and reference pointers */

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

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

  237.     if(cell->mv_ptr){

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

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

  240.     }else

  241.         mv_x= mv_y= 0;

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

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

  244. 

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

  246. 

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

  248.         /* copy using 16xH blocks */

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

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

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

  252.         }

  253. 

  254.         /* copy using 8xH blocks */

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

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

  257.             w -= 2;

  258.             src += 8;

  259.             dst += 8;

  260.         }

  261. 

  262.         if (w >= 1) {

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

  264.             w--;

  265.             src += 4;

  266.             dst += 4;

  267.         }

  268.     }

  269. }

  270. 

  271. 

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

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

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

  275. 

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

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

  278. 

  279. 

  280. /*

  281.  *  Replicate each even pixel as follows:

  282.  *  ABCDEFGH -> AACCEEGG

  283.  */

  284. static inline uint64_t replicate64(uint64_t a) {

  285. #if HAVE_BIGENDIAN

  286.     a &= 0xFF00FF00FF00FF00ULL;

  287.     a |= a >> 8;

  288. #else

  289.     a &= 0x00FF00FF00FF00FFULL;

  290.     a |= a << 8;

  291. #endif

  292.     return a;

  293. }

  294. 

  295. static inline uint32_t replicate32(uint32_t a) {

  296. #if HAVE_BIGENDIAN

  297.     a &= 0xFF00FF00UL;

  298.     a |= a >> 8;

  299. #else

  300.     a &= 0x00FF00FFUL;

  301.     a |= a << 8;

  302. #endif

  303.     return a;

  304. }

  305. 

  306. 

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

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

  309.                            int32_t row_offset)

  310. {

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

  312.         AV_WN64A(dst, pix);

  313. }

  314. 

  315. 

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

  317. enum {

  318.     IV3_NOERR       = 0,

  319.     IV3_BAD_RLE     = 1,

  320.     IV3_BAD_DATA    = 2,

  321.     IV3_BAD_COUNTER = 3,

  322.     IV3_UNSUPPORTED = 4,

  323.     IV3_OUT_OF_DATA = 5

  324. };

  325. 

  326. 

  327. #define BUFFER_PRECHECK \

  328. if (*data_ptr >= last_ptr) \

  329.     return IV3_OUT_OF_DATA; \

  330. 

  331. #define RLE_BLOCK_COPY \

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

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

  334. 

  335. #define RLE_BLOCK_COPY_8 \

  336.     pix64 = AV_RN64A(ref);\

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

  338.         pix64 = replicate64(pix64);\

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

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

  341.     } else \

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

  343. 

  344. #define RLE_LINES_COPY \

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

  346. 

  347. #define RLE_LINES_COPY_M10 \

  348.     pix64 = AV_RN64A(ref);\

  349.     if (is_top_of_cell) {\

  350.         pix64 = replicate64(pix64);\

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

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

  353.     } else \

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

  355. 

  356. #define APPLY_DELTA_4 \

  357.     AV_WN16A(dst + line_offset    ,\

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

  359.     AV_WN16A(dst + line_offset + 2,\

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

  361.     if (mode >= 3) {\

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

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

  364.         } else {\

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

  366.         }\

  367.     }

  368. 

  369. #define APPLY_DELTA_8 \

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

  371.     if (is_top_of_cell) { \

  372.         AV_WN32A(dst + row_offset    , \

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

  374.         AV_WN32A(dst + row_offset + 4, \

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

  376.     } else { \

  377.         AV_WN32A(dst + row_offset    , \

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

  379.         AV_WN32A(dst + row_offset + 4, \

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

  381.     } \

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

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

  384.     /* otherwise - interpolate */\

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

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

  387.     } else \

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

  389. 

  390. 

  391. #define APPLY_DELTA_1011_INTER \

  392.     if (mode == 10) { \

  393.         AV_WN32A(dst                 , \

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

  395.         AV_WN32A(dst + 4             , \

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

  397.         AV_WN32A(dst + row_offset    , \

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

  399.         AV_WN32A(dst + row_offset + 4, \

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

  401.     } else { \

  402.         AV_WN16A(dst                 , \

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

  404.         AV_WN16A(dst + 2             , \

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

  406.         AV_WN16A(dst + row_offset    , \

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

  408.         AV_WN16A(dst + row_offset + 2, \

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

  410.     }

  411. 

  412. 

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

  414.                             uint8_t *block, uint8_t *ref_block,

  415.                             int pitch, int h_zoom, int v_zoom, int mode,

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

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

  418. {

  419.     int           x, y, line, num_lines;

  420.     int           rle_blocks = 0;

  421.     uint8_t       code, *dst, *ref;

  422.     const vqEntry *delta_tab;

  423.     unsigned int  dyad1, dyad2;

  424.     uint64_t      pix64;

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

  426.     int           row_offset, blk_row_offset, line_offset;

  427. 

  428.     row_offset     =  pitch;

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

  430.     line_offset    = v_zoom ? row_offset : 0;

  431. 

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

  433.         return IV3_BAD_DATA;

  434. 

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

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

  437.             ref = ref_block;

  438.             dst = block;

  439. 

  440.             if (rle_blocks > 0) {

  441.                 if (mode <= 4) {

  442.                     RLE_BLOCK_COPY;

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

  444.                     RLE_BLOCK_COPY_8;

  445.                 }

  446.                 rle_blocks--;

  447.             } else {

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

  449.                     num_lines = 1;

  450.                     is_top_of_cell = is_first_row && !line;

  451. 

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

  453.                     if (mode <= 4)

  454.                         delta_tab = delta[line & 1];

  455.                     else

  456.                         delta_tab = delta[1];

  457.                     BUFFER_PRECHECK;

  458.                     code = bytestream_get_byte(data_ptr);

  459.                     if (code < 248) {

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

  461.                             BUFFER_PRECHECK;

  462.                             dyad1 = bytestream_get_byte(data_ptr);

  463.                             dyad2 = code;

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

  465.                                 return IV3_BAD_DATA;

  466.                         } else {

  467.                             /* process QUADS */

  468.                             code -= delta_tab->num_dyads;

  469.                             dyad1 = code / delta_tab->quad_exp;

  470.                             dyad2 = code % delta_tab->quad_exp;

  471.                             if (swap_quads[line & 1])

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

  473.                         }

  474.                         if (mode <= 4) {

  475.                             APPLY_DELTA_4;

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

  477.                             APPLY_DELTA_8;

  478.                         } else {

  479.                             APPLY_DELTA_1011_INTER;

  480.                         }

  481.                     } else {

  482.                         /* process RLE codes */

  483.                         switch (code) {

  484.                         case RLE_ESC_FC:

  485.                             skip_flag  = 0;

  486.                             rle_blocks = 1;

  487.                             code       = 253;

  488.                             /* FALLTHROUGH */

  489.                         case RLE_ESC_FF:

  490.                         case RLE_ESC_FE:

  491.                         case RLE_ESC_FD:

  492.                             num_lines = 257 - code - line;

  493.                             if (num_lines <= 0)

  494.                                 return IV3_BAD_RLE;

  495.                             if (mode <= 4) {

  496.                                 RLE_LINES_COPY;

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

  498.                                 RLE_LINES_COPY_M10;

  499.                             }

  500.                             break;

  501.                         case RLE_ESC_FB:

  502.                             BUFFER_PRECHECK;

  503.                             code = bytestream_get_byte(data_ptr);

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

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

  506.                                 return IV3_BAD_COUNTER;

  507.                             skip_flag = code & 0x20;

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

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

  510.                                 if (mode <= 4) {

  511.                                     RLE_LINES_COPY;

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

  513.                                     RLE_LINES_COPY_M10;

  514.                                 }

  515.                             }

  516.                             break;

  517.                         case RLE_ESC_F9:

  518.                             skip_flag  = 1;

  519.                             rle_blocks = 1;

  520.                             /* FALLTHROUGH */

  521.                         case RLE_ESC_FA:

  522.                             if (line)

  523.                                 return IV3_BAD_RLE;

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

  525.                             if (cell->mv_ptr) {

  526.                                 if (mode <= 4) {

  527.                                     RLE_LINES_COPY;

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

  529.                                     RLE_LINES_COPY_M10;

  530.                                 }

  531.                             }

  532.                             break;

  533.                         default:

  534.                             return IV3_UNSUPPORTED;

  535.                         }

  536.                     }

  537. 

  538.                     line += num_lines;

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

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

  541.                 }

  542.             }

  543. 

  544.             /* move to next horizontal block */

  545.             block     += 4 << h_zoom;

  546.             ref_block += 4 << h_zoom;

  547.         }

  548. 

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

  550.         ref_block += blk_row_offset;

  551.         block     += blk_row_offset;

  552.     }

  553.     return IV3_NOERR;

  554. }

  555. 

  556. 

  557. /**

  558.  *  Decode a vector-quantized cell.

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

  560.  *  with which a cell can be encoded.

  561.  *

  562.  *  @param ctx      pointer to the decoder context

  563.  *  @param avctx    ptr to the AVCodecContext

  564.  *  @param plane    pointer to the plane descriptor

  565.  *  @param cell     pointer to the cell  descriptor

  566.  *  @param data_ptr pointer to the compressed data

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

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

  569.  */

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

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

  572.                        const uint8_t *last_ptr)

  573. {

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

  575.     int           zoom_fac;

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

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

  578.     const vqEntry *delta[2];

  579.     const uint8_t *data_start = data_ptr;

  580. 

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

  582.     code     = *data_ptr++;

  583.     mode     = code >> 4;

  584.     vq_index = code & 0xF;

  585. 

  586.     /* setup output and reference pointers */

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

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

  589. 

  590.     if (cell->mv_ptr) {

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

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

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

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

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

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

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

  598.             return AVERROR_INVALIDDATA;

  599.         }

  600.     }

  601. 

  602.     if (!cell->mv_ptr) {

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

  604.         ref_block = block - plane->pitch;

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

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

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

  608.         copy_cell(ctx, plane, cell);

  609.     } else {

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

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

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

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

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

  615.     }

  616. 

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

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

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

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

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

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

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

  624.     } else {

  625.         vq_index += ctx->cb_offset;

  626.         prim_indx = second_indx = vq_index;

  627.     }

  628. 

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

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

  631.                prim_indx, second_indx);

  632.         return AVERROR_INVALIDDATA;

  633.     }

  634. 

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

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

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

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

  639. 

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

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

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

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

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

  645.     }

  646. 

  647.     error = IV3_NOERR;

  648. 

  649.     switch (mode) {

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

  651.     case 1:

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

  653.     case 4:

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

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

  656.             return AVERROR_INVALIDDATA;

  657.         }

  658. 

  659.         zoom_fac = mode >= 3;

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

  661.                                  0, zoom_fac, mode, delta, swap_quads,

  662.                                  &data_ptr, last_ptr);

  663.         break;

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

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

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

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

  668.                                      1, 1, mode, delta, swap_quads,

  669.                                      &data_ptr, last_ptr);

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

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

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

  673.                return AVERROR_INVALIDDATA;

  674.             }

  675. 

  676.             zoom_fac = mode == 10;

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

  678.                                      zoom_fac, 1, mode, delta, swap_quads,

  679.                                      &data_ptr, last_ptr);

  680.         }

  681.         break;

  682.     default:

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

  684.         return AVERROR_INVALIDDATA;

  685.     }//switch mode

  686. 

  687.     switch (error) {

  688.     case IV3_BAD_RLE:

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

  690.                mode, data_ptr[-1]);

  691.         return AVERROR_INVALIDDATA;

  692.     case IV3_BAD_DATA:

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

  694.         return AVERROR_INVALIDDATA;

  695.     case IV3_BAD_COUNTER:

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

  697.         return AVERROR_INVALIDDATA;

  698.     case IV3_UNSUPPORTED:

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

  700.         return AVERROR_INVALIDDATA;

  701.     case IV3_OUT_OF_DATA:

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

  703.         return AVERROR_INVALIDDATA;

  704.     }

  705. 

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

  707. }

  708. 

  709. 

  710. /* Binary tree codes. */

  711. enum {

  712.     H_SPLIT    = 0,

  713.     V_SPLIT    = 1,

  714.     INTRA_NULL = 2,

  715.     INTER_DATA = 3

  716. };

  717. 

  718. 

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

  720. 

  721. #define UPDATE_BITPOS(n) \

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

  723.     ctx->need_resync = 1

  724. 

  725. #define RESYNC_BITSTREAM \

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

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

  728.         ctx->skip_bits   = 0;                                  \

  729.         ctx->need_resync = 0;                                  \

  730.     }

  731. 

  732. #define CHECK_CELL \

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

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

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

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

  737.         return AVERROR_INVALIDDATA;                                                              \

  738.     }

  739. 

  740. 

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

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

  743.                          const int depth, const int strip_width)

  744. {

  745.     Cell    curr_cell;

  746.     int     bytes_used;

  747.     int mv_x, mv_y;

  748. 

  749.     if (depth <= 0) {

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

  751.         return AVERROR_INVALIDDATA; // unwind recursion

  752.     }

  753. 

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

  755.     if (code == H_SPLIT) {

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

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

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

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

  760.             return AVERROR_INVALIDDATA;

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

  762.         if (curr_cell.width > strip_width) {

  763.             /* split strip */

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

  765.         } else

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

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

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

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

  770.             return AVERROR_INVALIDDATA;

  771.     }

  772. 

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

  774.         RESYNC_BITSTREAM;

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

  776.         case H_SPLIT:

  777.         case V_SPLIT:

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

  779.                 return AVERROR_INVALIDDATA;

  780.             break;

  781.         case INTRA_NULL:

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

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

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

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

  786.                 RESYNC_BITSTREAM;

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

  788.                 if (code >= 2) {

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

  790.                     return AVERROR_INVALIDDATA;

  791.                 }

  792.                 if (code == 1)

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

  794. 

  795.                 CHECK_CELL

  796.                 if (!curr_cell.mv_ptr)

  797.                     return AVERROR_INVALIDDATA;

  798. 

  799.                 mv_y = curr_cell.mv_ptr[0];

  800.                 mv_x = curr_cell.mv_ptr[1];

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

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

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

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

  805.                     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);

  806.                     return AVERROR_INVALIDDATA;

  807.                 }

  808. 

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

  810.                 return 0;

  811.             }

  812.             break;

  813.         case INTER_DATA:

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

  815.                 unsigned mv_idx;

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

  817.                 if (!ctx->need_resync)

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

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

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

  821.                     return AVERROR_INVALIDDATA;

  822.                 }

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

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

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

  826.                     return AVERROR_INVALIDDATA;

  827.                 }

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

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

  830.                 UPDATE_BITPOS(8);

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

  832.                 if (!ctx->need_resync)

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

  834. 

  835.                 CHECK_CELL

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

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

  838.                 if (bytes_used < 0)

  839.                     return AVERROR_INVALIDDATA;

  840. 

  841.                 UPDATE_BITPOS(bytes_used << 3);

  842.                 ctx->next_cell_data += bytes_used;

  843.                 return 0;

  844.             }

  845.             break;

  846.         }

  847.     }//while

  848. 

  849.     return AVERROR_INVALIDDATA;

  850. }

  851. 

  852. 

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

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

  855.                         int32_t strip_width)

  856. {

  857.     Cell            curr_cell;

  858.     unsigned        num_vectors;

  859. 

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

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

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

  863.     if (num_vectors > 256) {

  864.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  866.         return AVERROR_INVALIDDATA;

  867.     }

  868.     if (num_vectors * 2 > data_size)

  869.         return AVERROR_INVALIDDATA;

  870. 

  871.     ctx->num_vectors = num_vectors;

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

  873. 

  874.     /* init the bitreader */

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

  876.     ctx->skip_bits   = 0;

  877.     ctx->need_resync = 0;

  878. 

  879.     ctx->last_byte = data + data_size;

  880. 

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

  882.     curr_cell.xpos   = curr_cell.ypos = 0;

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

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

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

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

  887. 

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

  889. }

  890. 

  891. 

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

  893. 

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

  895.                                 const uint8_t *buf, int buf_size)

  896. {

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

  898.     uint32_t        frame_num, word2, check_sum, data_size;

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

  900.     uint16_t        height, width;

  901.     int             i, j;

  902. 

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

  904.     frame_num = bytestream_get_le32(&buf_ptr);

  905.     word2     = bytestream_get_le32(&buf_ptr);

  906.     check_sum = bytestream_get_le32(&buf_ptr);

  907.     data_size = bytestream_get_le32(&buf_ptr);

  908. 

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

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

  911.         return AVERROR_INVALIDDATA;

  912.     }

  913. 

  914.     /* parse the bitstream header */

  915.     bs_hdr = buf_ptr;

  916.     buf_size -= 16;

  917. 

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

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

  920.         return AVERROR_INVALIDDATA;

  921.     }

  922. 

  923.     ctx->frame_num   =  frame_num;

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

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

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

  927. 

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

  929.         return 4;

  930.     if (ctx->data_size > buf_size)

  931.         ctx->data_size = buf_size;

  932. 

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

  934. 

  935.     /* check frame dimensions */

  936.     height = bytestream_get_le16(&buf_ptr);

  937.     width  = bytestream_get_le16(&buf_ptr);

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

  939.         return AVERROR_INVALIDDATA;

  940. 

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

  942.         int res;

  943. 

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

  945. 

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

  947.             height < 16 || height > 480 ||

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

  949.             av_log(avctx, AV_LOG_ERROR,

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

  951.             return AVERROR_INVALIDDATA;

  952.         }

  953.         free_frame_buffers(ctx);

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

  955.              return res;

  956.         avcodec_set_dimensions(avctx, width, height);

  957.     }

  958. 

  959.     y_offset = bytestream_get_le32(&buf_ptr);

  960.     v_offset = bytestream_get_le32(&buf_ptr);

  961.     u_offset = bytestream_get_le32(&buf_ptr);

  962. 

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

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

  965.     starts[0] = y_offset;

  966.     starts[1] = v_offset;

  967.     starts[2] = u_offset;

  968. 

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

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

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

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

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

  974.     }

  975. 

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

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

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

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

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

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

  982.         return AVERROR_INVALIDDATA;

  983.     }

  984. 

  985.     ctx->y_data_ptr = bs_hdr + y_offset;

  986.     ctx->v_data_ptr = bs_hdr + v_offset;

  987.     ctx->u_data_ptr = bs_hdr + u_offset;

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

  989. 

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

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

  992.         return 16;

  993.     }

  994. 

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

  996.         avpriv_request_sample(avctx, "8-bit pixel format");

  997.         return AVERROR_PATCHWELCOME;

  998.     }

  999. 

  1000.     if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {

  1001.         avpriv_request_sample(avctx, "Halfpel motion vectors");

  1002.         return AVERROR_PATCHWELCOME;

  1003.     }

  1004. 

  1005.     return 0;

  1006. }

  1007. 

  1008. 

  1009. /**

  1010.  *  Convert and output the current plane.

  1011.  *  All pixel values will be upsampled by shifting right by one bit.

  1012.  *

  1013.  *  @param[in]  plane        pointer to the descriptor of the plane being processed

  1014.  *  @param[in]  buf_sel      indicates which frame buffer the input data stored in

  1015.  *  @param[out] dst          pointer to the buffer receiving converted pixels

  1016.  *  @param[in]  dst_pitch    pitch for moving to the next y line

  1017.  *  @param[in]  dst_height   output plane height

  1018.  */

  1019. static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst,

  1020.                          int dst_pitch, int dst_height)

  1021. {

  1022.     int             x,y;

  1023.     const uint8_t   *src  = plane->pixels[buf_sel];

  1024.     uint32_t        pitch = plane->pitch;

  1025. 

  1026.     dst_height = FFMIN(dst_height, plane->height);

  1027.     for (y = 0; y < dst_height; y++) {

  1028.         /* convert four pixels at once using SWAR */

  1029.         for (x = 0; x < plane->width >> 2; x++) {

  1030.             AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);

  1031.             src += 4;

  1032.             dst += 4;

  1033.         }

  1034. 

  1035.         for (x <<= 2; x < plane->width; x++)

  1036.             *dst++ = *src++ << 1;

  1037. 

  1038.         src += pitch     - plane->width;

  1039.         dst += dst_pitch - plane->width;

  1040.     }

  1041. }

  1042. 

  1043. 

  1044. static av_cold int decode_init(AVCodecContext *avctx)

  1045. {

  1046.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1047. 

  1048.     ctx->avctx     = avctx;

  1049.     avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  1050. 

  1051.     build_requant_tab();

  1052. 

  1053.     ff_hpeldsp_init(&ctx->hdsp, avctx->flags);

  1054. 

  1055.     return allocate_frame_buffers(ctx, avctx, avctx->width, avctx->height);

  1056. }

  1057. 

  1058. 

  1059. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  1060.                         AVPacket *avpkt)

  1061. {

  1062.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1063.     const uint8_t *buf = avpkt->data;

  1064.     int buf_size       = avpkt->size;

  1065.     AVFrame *frame     = data;

  1066.     int res;

  1067. 

  1068.     res = decode_frame_headers(ctx, avctx, buf, buf_size);

  1069.     if (res < 0)

  1070.         return res;

  1071. 

  1072.     /* skip sync(null) frames */

  1073.     if (res) {

  1074.         // we have processed 16 bytes but no data was decoded

  1075.         *got_frame = 0;

  1076.         return buf_size;

  1077.     }

  1078. 

  1079.     /* skip droppable INTER frames if requested */

  1080.     if (ctx->frame_flags & BS_NONREF &&

  1081.        (avctx->skip_frame >= AVDISCARD_NONREF))

  1082.         return 0;

  1083. 

  1084.     /* skip INTER frames if requested */

  1085.     if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)

  1086.         return 0;

  1087. 

  1088.     /* use BS_BUFFER flag for buffer switching */

  1089.     ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;

  1090. 

  1091.     if ((res = ff_get_buffer(avctx, frame, 0)) < 0)

  1092.         return res;

  1093. 

  1094.     /* decode luma plane */

  1095.     if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))

  1096.         return res;

  1097. 

  1098.     /* decode chroma planes */

  1099.     if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))

  1100.         return res;

  1101. 

  1102.     if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))

  1103.         return res;

  1104. 

  1105.     output_plane(&ctx->planes[0], ctx->buf_sel,

  1106.                  frame->data[0], frame->linesize[0],

  1107.                  avctx->height);

  1108.     output_plane(&ctx->planes[1], ctx->buf_sel,

  1109.                  frame->data[1], frame->linesize[1],

  1110.                  (avctx->height + 3) >> 2);

  1111.     output_plane(&ctx->planes[2], ctx->buf_sel,

  1112.                  frame->data[2], frame->linesize[2],

  1113.                  (avctx->height + 3) >> 2);

  1114. 

  1115.     *got_frame = 1;

  1116. 

  1117.     return buf_size;

  1118. }

  1119. 

  1120. 

  1121. static av_cold int decode_close(AVCodecContext *avctx)

  1122. {

  1123.     free_frame_buffers(avctx->priv_data);

  1124. 

  1125.     return 0;

  1126. }

  1127. 

  1128. AVCodec ff_indeo3_decoder = {

  1129.     .name           = "indeo3",

  1130.     .type           = AVMEDIA_TYPE_VIDEO,

  1131.     .id             = AV_CODEC_ID_INDEO3,

  1132.     .priv_data_size = sizeof(Indeo3DecodeContext),

  1133.     .init           = decode_init,

  1134.     .close          = decode_close,

  1135.     .decode         = decode_frame,

  1136.     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),

  1137.     .capabilities   = CODEC_CAP_DR1,

  1138. };