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FFmpeg/libavcodec/indeo3.c

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  1. /*

  2.  * Indeo Video v3 compatible decoder

  3.  * Copyright (c) 2009 - 2011 Maxim Poliakovski

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * Libav is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file

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

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

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

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

  28.  *

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

  30.  */

  31. 

  32. #include "libavutil/imgutils.h"

  33. #include "libavutil/intreadwrite.h"

  34. #include "avcodec.h"

  35. #include "bytestream.h"

  36. #include "get_bits.h"

  37. #include "hpeldsp.h"

  38. #include "internal.h"

  39. 

  40. #include "indeo3data.h"

  41. 

  42. /* RLE opcodes. */

  43. enum {

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

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

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

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

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

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

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

  51. };

  52. 

  53. 

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

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

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

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

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

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

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

  61. 

  62. 

  63. typedef struct Plane {

  64.     uint8_t         *buffers[2];

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

  66.     uint32_t        width;

  67.     uint32_t        height;

  68.     uint32_t        pitch;

  69. } Plane;

  70. 

  71. #define CELL_STACK_MAX  20

  72. 

  73. typedef struct Cell {

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

  75.     int16_t         ypos;

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

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

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

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

  80. } Cell;

  81. 

  82. typedef struct Indeo3DecodeContext {

  83.     AVCodecContext *avctx;

  84.     HpelDSPContext  hdsp;

  85. 

  86.     GetBitContext   gb;

  87.     int             need_resync;

  88.     int             skip_bits;

  89.     const uint8_t   *next_cell_data;

  90.     const uint8_t   *last_byte;

  91.     const int8_t    *mc_vectors;

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

  93. 

  94.     int16_t         width, height;

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

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

  97.     uint16_t        frame_flags;    ///< frame properties

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

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

  100.     const uint8_t   *y_data_ptr;

  101.     const uint8_t   *v_data_ptr;

  102.     const uint8_t   *u_data_ptr;

  103.     int32_t         y_data_size;

  104.     int32_t         v_data_size;

  105.     int32_t         u_data_size;

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

  107.     Plane           planes[3];

  108. } Indeo3DecodeContext;

  109. 

  110. 

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

  112. 

  113. /*

  114.  *  Build the static requantization table.

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

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

  117.  */

  118. static av_cold void build_requant_tab(void)

  119. {

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

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

  122. 

  123.     int i, j, step;

  124. 

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

  126.         step = i + 2;

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

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

  129.     }

  130. 

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

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

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

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

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

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

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

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

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

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

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

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

  143. 

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

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

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

  147. }

  148. 

  149. 

  150. static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,

  151.                                           AVCodecContext *avctx)

  152. {

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

  154.     int luma_pitch, chroma_pitch, luma_size, chroma_size;

  155. 

  156.     luma_width  = ctx->width;

  157.     luma_height = ctx->height;

  158. 

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

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

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

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

  163.                luma_width, luma_height);

  164.         return AVERROR_INVALIDDATA;

  165.     }

  166. 

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

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

  169. 

  170.     luma_pitch   = FFALIGN(luma_width,   16);

  171.     chroma_pitch = FFALIGN(chroma_width, 16);

  172. 

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

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

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

  176. 

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

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

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

  180. 

  181.     /* allocate frame buffers */

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

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

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

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

  186. 

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

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

  189. 

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

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

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

  193. 

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

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

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

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

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

  199.     }

  200. 

  201.     return 0;

  202. }

  203. 

  204. 

  205. static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx)

  206. {

  207.     int p;

  208. 

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

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

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

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

  213.     }

  214. }

  215. 

  216. 

  217. /**

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

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

  220.  *

  221.  *  @param ctx      pointer to the decoder context

  222.  *  @param plane    pointer to the plane descriptor

  223.  *  @param cell     pointer to the cell  descriptor

  224.  */

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

  226. {

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

  228.     uint8_t *src, *dst;

  229. 

  230.     /* setup output and reference pointers */

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

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

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

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

  235. 

  236.     /* -1 because there is an extra line on top for prediction */

  237.     if ((cell->ypos << 2) + mv_y < -1 || (cell->xpos << 2) + mv_x < 0 ||

  238.         ((cell->ypos + cell->height) << 2) + mv_y > plane->height     ||

  239.         ((cell->xpos + cell->width)  << 2) + mv_x > plane->width) {

  240.         av_log(ctx->avctx, AV_LOG_ERROR,

  241.                "Motion vectors point out of the frame.\n");

  242.         return AVERROR_INVALIDDATA;

  243.     }

  244. 

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

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

  247. 

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

  249. 

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

  251.         /* copy using 16xH blocks */

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

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

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

  255.         }

  256. 

  257.         /* copy using 8xH blocks */

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

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

  260.             w -= 2;

  261.             src += 8;

  262.             dst += 8;

  263.         } else if (w >= 1) {

  264.             ctx->hdsp.put_pixels_tab[2][0](dst, src, plane->pitch, h);

  265.             w--;

  266.             src += 4;

  267.             dst += 4;

  268.         }

  269.     }

  270. 

  271.     return 0;

  272. }

  273. 

  274. 

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

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

  277.     AV_WN32A(dst, ((AV_RN32(src) + AV_RN32(ref)) >> 1) & 0x7F7F7F7FUL)

  278. 

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

  280.     AV_WN64A(dst, ((AV_RN64(src) + AV_RN64(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL)

  281. 

  282. 

  283. /*

  284.  *  Replicate each even pixel as follows:

  285.  *  ABCDEFGH -> AACCEEGG

  286.  */

  287. static inline uint64_t replicate64(uint64_t a) {

  288. #if HAVE_BIGENDIAN

  289.     a &= 0xFF00FF00FF00FF00ULL;

  290.     a |= a >> 8;

  291. #else

  292.     a &= 0x00FF00FF00FF00FFULL;

  293.     a |= a << 8;

  294. #endif

  295.     return a;

  296. }

  297. 

  298. static inline uint32_t replicate32(uint32_t a) {

  299. #if HAVE_BIGENDIAN

  300.     a &= 0xFF00FF00UL;

  301.     a |= a >> 8;

  302. #else

  303.     a &= 0x00FF00FFUL;

  304.     a |= a << 8;

  305. #endif

  306.     return a;

  307. }

  308. 

  309. 

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

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

  312.                            int32_t row_offset)

  313. {

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

  315.         AV_WN64A(dst, pix);

  316. }

  317. 

  318. 

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

  320. enum {

  321.     IV3_NOERR       = 0,

  322.     IV3_BAD_RLE     = 1,

  323.     IV3_BAD_DATA    = 2,

  324.     IV3_BAD_COUNTER = 3,

  325.     IV3_UNSUPPORTED = 4,

  326.     IV3_OUT_OF_DATA = 5

  327. };

  328. 

  329. 

  330. #define BUFFER_PRECHECK \

  331. if (*data_ptr >= last_ptr) \

  332.     return IV3_OUT_OF_DATA; \

  333. 

  334. #define RLE_BLOCK_COPY \

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

  336.         ctx->hdsp.put_pixels_tab[2][0](dst, ref, row_offset, 4 << v_zoom)

  337. 

  338. #define RLE_BLOCK_COPY_8 \

  339.     pix64 = AV_RN64(ref);\

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

  341.         pix64 = replicate64(pix64);\

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

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

  344.     } else \

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

  346. 

  347. #define RLE_LINES_COPY \

  348.     ctx->hdsp.put_pixels_tab[2][0](dst, ref, row_offset, num_lines << v_zoom)

  349. 

  350. #define RLE_LINES_COPY_M10 \

  351.     pix64 = AV_RN64(ref);\

  352.     if (is_top_of_cell) {\

  353.         pix64 = replicate64(pix64);\

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

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

  356.     } else \

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

  358. 

  359. #define APPLY_DELTA_4 \

  360.     AV_WN16A(dst + line_offset    ,\

  361.              (AV_RN16(ref    ) + delta_tab->deltas[dyad1]) & 0x7F7F);\

  362.     AV_WN16A(dst + line_offset + 2,\

  363.              (AV_RN16(ref + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\

  364.     if (mode >= 3) {\

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

  366.             AV_COPY32U(dst, dst + row_offset);\

  367.         } else {\

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

  369.         }\

  370.     }

  371. 

  372. #define APPLY_DELTA_8 \

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

  374.     if (is_top_of_cell) { \

  375.         AV_WN32A(dst + row_offset    , \

  376.                  (replicate32(AV_RN32(ref    )) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\

  377.         AV_WN32A(dst + row_offset + 4, \

  378.                  (replicate32(AV_RN32(ref + 4)) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\

  379.     } else { \

  380.         AV_WN32A(dst + row_offset    , \

  381.                  (AV_RN32(ref    ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\

  382.         AV_WN32A(dst + row_offset + 4, \

  383.                  (AV_RN32(ref + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\

  384.     } \

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

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

  387.     /* otherwise - interpolate */\

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

  389.         AV_COPY64U(dst, dst + row_offset);\

  390.     } else \

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

  392. 

  393. 

  394. #define APPLY_DELTA_1011_INTER \

  395.     if (mode == 10) { \

  396.         AV_WN32A(dst                 , \

  397.                  (AV_RN32(dst                 ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\

  398.         AV_WN32A(dst + 4             , \

  399.                  (AV_RN32(dst + 4             ) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\

  400.         AV_WN32A(dst + row_offset    , \

  401.                  (AV_RN32(dst + row_offset    ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\

  402.         AV_WN32A(dst + row_offset + 4, \

  403.                  (AV_RN32(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\

  404.     } else { \

  405.         AV_WN16A(dst                 , \

  406.                  (AV_RN16(dst                 ) + delta_tab->deltas[dyad1]) & 0x7F7F);\

  407.         AV_WN16A(dst + 2             , \

  408.                  (AV_RN16(dst + 2             ) + delta_tab->deltas[dyad2]) & 0x7F7F);\

  409.         AV_WN16A(dst + row_offset    , \

  410.                  (AV_RN16(dst + row_offset    ) + delta_tab->deltas[dyad1]) & 0x7F7F);\

  411.         AV_WN16A(dst + row_offset + 2, \

  412.                  (AV_RN16(dst + row_offset + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\

  413.     }

  414. 

  415. 

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

  417.                             uint8_t *block, uint8_t *ref_block,

  418.                             int pitch, int h_zoom, int v_zoom, int mode,

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

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

  421. {

  422.     int           x, y, line, num_lines;

  423.     int           rle_blocks = 0;

  424.     uint8_t       code, *dst, *ref;

  425.     const vqEntry *delta_tab;

  426.     unsigned int  dyad1, dyad2;

  427.     uint64_t      pix64;

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

  429.     int           row_offset, blk_row_offset, line_offset;

  430. 

  431.     row_offset     =  pitch;

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

  433.     line_offset    = v_zoom ? row_offset : 0;

  434. 

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

  436.         return IV3_BAD_DATA;

  437. 

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

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

  440.             ref = ref_block;

  441.             dst = block;

  442. 

  443.             if (rle_blocks > 0) {

  444.                 if (mode <= 4) {

  445.                     RLE_BLOCK_COPY;

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

  447.                     RLE_BLOCK_COPY_8;

  448.                 }

  449.                 rle_blocks--;

  450.             } else {

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

  452.                     num_lines = 1;

  453.                     is_top_of_cell = is_first_row && !line;

  454. 

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

  456.                     if (mode <= 4)

  457.                         delta_tab = delta[line & 1];

  458.                     else

  459.                         delta_tab = delta[1];

  460.                     BUFFER_PRECHECK;

  461.                     code = bytestream_get_byte(data_ptr);

  462.                     if (code < 248) {

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

  464.                             BUFFER_PRECHECK;

  465.                             dyad1 = bytestream_get_byte(data_ptr);

  466.                             dyad2 = code;

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

  468.                                 return IV3_BAD_DATA;

  469.                         } else {

  470.                             /* process QUADS */

  471.                             code -= delta_tab->num_dyads;

  472.                             dyad1 = code / delta_tab->quad_exp;

  473.                             dyad2 = code % delta_tab->quad_exp;

  474.                             if (swap_quads[line & 1])

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

  476.                         }

  477.                         if (mode <= 4) {

  478.                             APPLY_DELTA_4;

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

  480.                             APPLY_DELTA_8;

  481.                         } else {

  482.                             APPLY_DELTA_1011_INTER;

  483.                         }

  484.                     } else {

  485.                         /* process RLE codes */

  486.                         switch (code) {

  487.                         case RLE_ESC_FC:

  488.                             skip_flag  = 0;

  489.                             rle_blocks = 1;

  490.                             code       = 253;

  491.                             /* FALLTHROUGH */

  492.                         case RLE_ESC_FF:

  493.                         case RLE_ESC_FE:

  494.                         case RLE_ESC_FD:

  495.                             num_lines = 257 - code - line;

  496.                             if (num_lines <= 0)

  497.                                 return IV3_BAD_RLE;

  498.                             if (mode <= 4) {

  499.                                 RLE_LINES_COPY;

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

  501.                                 RLE_LINES_COPY_M10;

  502.                             }

  503.                             break;

  504.                         case RLE_ESC_FB:

  505.                             BUFFER_PRECHECK;

  506.                             code = bytestream_get_byte(data_ptr);

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

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

  509.                                 return IV3_BAD_COUNTER;

  510.                             skip_flag = code & 0x20;

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

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

  513.                                 if (mode <= 4) {

  514.                                     RLE_LINES_COPY;

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

  516.                                     RLE_LINES_COPY_M10;

  517.                                 }

  518.                             }

  519.                             break;

  520.                         case RLE_ESC_F9:

  521.                             skip_flag  = 1;

  522.                             rle_blocks = 1;

  523.                             /* FALLTHROUGH */

  524.                         case RLE_ESC_FA:

  525.                             if (line)

  526.                                 return IV3_BAD_RLE;

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

  528.                             if (cell->mv_ptr) {

  529.                                 if (mode <= 4) {

  530.                                     RLE_LINES_COPY;

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

  532.                                     RLE_LINES_COPY_M10;

  533.                                 }

  534.                             }

  535.                             break;

  536.                         default:

  537.                             return IV3_UNSUPPORTED;

  538.                         }

  539.                     }

  540. 

  541.                     line += num_lines;

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

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

  544.                 }

  545.             }

  546. 

  547.             /* move to next horizontal block */

  548.             block     += 4 << h_zoom;

  549.             ref_block += 4 << h_zoom;

  550.         }

  551. 

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

  553.         ref_block += blk_row_offset;

  554.         block     += blk_row_offset;

  555.     }

  556.     return IV3_NOERR;

  557. }

  558. 

  559. 

  560. /**

  561.  *  Decode a vector-quantized cell.

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

  563.  *  with which a cell can be encoded.

  564.  *

  565.  *  @param ctx      pointer to the decoder context

  566.  *  @param avctx    ptr to the AVCodecContext

  567.  *  @param plane    pointer to the plane descriptor

  568.  *  @param cell     pointer to the cell  descriptor

  569.  *  @param data_ptr pointer to the compressed data

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

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

  572.  */

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

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

  575.                        const uint8_t *last_ptr)

  576. {

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

  578.     int           zoom_fac;

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

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

  581.     const vqEntry *delta[2];

  582.     const uint8_t *data_start = data_ptr;

  583. 

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

  585.     code     = *data_ptr++;

  586.     mode     = code >> 4;

  587.     vq_index = code & 0xF;

  588. 

  589.     /* setup output and reference pointers */

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

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

  592.     if (!cell->mv_ptr) {

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

  594.         ref_block = block - plane->pitch;

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

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

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

  598.         int ret = copy_cell(ctx, plane, cell);

  599.         if (ret < 0)

  600.             return ret;

  601.     } else {

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

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

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

  605. 

  606.         /* -1 because there is an extra line on top for prediction */

  607.         if ((cell->ypos << 2) + mv_y < -1 || (cell->xpos << 2) + mv_x < 0 ||

  608.             ((cell->ypos + cell->height) << 2) + mv_y > plane->height     ||

  609.             ((cell->xpos + cell->width)  << 2) + mv_x > plane->width) {

  610.             av_log(ctx->avctx, AV_LOG_ERROR,

  611.                    "Motion vectors point out of the frame.\n");

  612.             return AVERROR_INVALIDDATA;

  613.         }

  614. 

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

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

  617.     }

  618. 

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

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

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

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

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

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

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

  626.     } else {

  627.         vq_index += ctx->cb_offset;

  628.         prim_indx = second_indx = vq_index;

  629.     }

  630. 

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

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

  633.                prim_indx, second_indx);

  634.         return AVERROR_INVALIDDATA;

  635.     }

  636. 

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

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

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

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

  641. 

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

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

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

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

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

  647.     }

  648. 

  649.     error = IV3_NOERR;

  650. 

  651.     switch (mode) {

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

  653.     case 1:

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

  655.     case 4:

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

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

  658.             return AVERROR_INVALIDDATA;

  659.         }

  660. 

  661.         zoom_fac = mode >= 3;

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

  663.                                  0, zoom_fac, mode, delta, swap_quads,

  664.                                  &data_ptr, last_ptr);

  665.         break;

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

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

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

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

  670.                                      1, 1, mode, delta, swap_quads,

  671.                                      &data_ptr, last_ptr);

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

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

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

  675.                return AVERROR_INVALIDDATA;

  676.             }

  677. 

  678.             zoom_fac = mode == 10;

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

  680.                                      zoom_fac, 1, mode, delta, swap_quads,

  681.                                      &data_ptr, last_ptr);

  682.         }

  683.         break;

  684.     default:

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

  686.         return AVERROR_INVALIDDATA;

  687.     }//switch mode

  688. 

  689.     switch (error) {

  690.     case IV3_BAD_RLE:

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

  692.                mode, data_ptr[-1]);

  693.         return AVERROR_INVALIDDATA;

  694.     case IV3_BAD_DATA:

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

  696.         return AVERROR_INVALIDDATA;

  697.     case IV3_BAD_COUNTER:

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

  699.         return AVERROR_INVALIDDATA;

  700.     case IV3_UNSUPPORTED:

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

  702.         return AVERROR_INVALIDDATA;

  703.     case IV3_OUT_OF_DATA:

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

  705.         return AVERROR_INVALIDDATA;

  706.     }

  707. 

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

  709. }

  710. 

  711. 

  712. /* Binary tree codes. */

  713. enum {

  714.     H_SPLIT    = 0,

  715.     V_SPLIT    = 1,

  716.     INTRA_NULL = 2,

  717.     INTER_DATA = 3

  718. };

  719. 

  720. 

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

  722. 

  723. #define UPDATE_BITPOS(n) \

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

  725.     ctx->need_resync = 1

  726. 

  727. #define RESYNC_BITSTREAM \

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

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

  730.         ctx->skip_bits   = 0;                                  \

  731.         ctx->need_resync = 0;                                  \

  732.     }

  733. 

  734. #define CHECK_CELL \

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

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

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

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

  739.         return AVERROR_INVALIDDATA;                                                              \

  740.     }

  741. 

  742. 

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

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

  745.                          const int depth, const int strip_width)

  746. {

  747.     Cell    curr_cell;

  748.     int     bytes_used, ret;

  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 (1) { /* 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.                 ret = copy_cell(ctx, plane, &curr_cell);

  800.                 return ret;

  801.             }

  802.             break;

  803.         case INTER_DATA:

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

  805.                 unsigned mv_idx;

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

  807.                 if (!ctx->need_resync)

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

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

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

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

  812.                     return AVERROR_INVALIDDATA;

  813.                 }

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

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

  816.                 UPDATE_BITPOS(8);

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

  818.                 if (!ctx->need_resync)

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

  820. 

  821.                 CHECK_CELL

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

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

  824.                 if (bytes_used < 0)

  825.                     return AVERROR_INVALIDDATA;

  826. 

  827.                 UPDATE_BITPOS(bytes_used << 3);

  828.                 ctx->next_cell_data += bytes_used;

  829.                 return 0;

  830.             }

  831.             break;

  832.         }

  833.     }//while

  834. 

  835.     return 0;

  836. }

  837. 

  838. 

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

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

  841.                         int32_t strip_width)

  842. {

  843.     Cell            curr_cell;

  844.     unsigned        num_vectors;

  845. 

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

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

  848.     num_vectors = bytestream_get_le32(&data);

  849.     if (num_vectors > 256) {

  850.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  852.         return AVERROR_INVALIDDATA;

  853.     }

  854.     if (num_vectors * 2 >= data_size)

  855.         return AVERROR_INVALIDDATA;

  856. 

  857.     ctx->num_vectors = num_vectors;

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

  859. 

  860.     /* init the bitreader */

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

  862.     ctx->skip_bits   = 0;

  863.     ctx->need_resync = 0;

  864. 

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

  866. 

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

  868.     curr_cell.xpos   = curr_cell.ypos = 0;

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

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

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

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

  873. 

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

  875. }

  876. 

  877. 

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

  879. 

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

  881.                                 const uint8_t *buf, int buf_size)

  882. {

  883.     GetByteContext gb;

  884.     const uint8_t   *bs_hdr;

  885.     uint32_t        frame_num, word2, check_sum, data_size;

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

  887.     uint16_t        height, width;

  888.     int             i, j;

  889. 

  890.     bytestream2_init(&gb, buf, buf_size);

  891. 

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

  893.     frame_num = bytestream2_get_le32(&gb);

  894.     word2     = bytestream2_get_le32(&gb);

  895.     check_sum = bytestream2_get_le32(&gb);

  896.     data_size = bytestream2_get_le32(&gb);

  897. 

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

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

  900.         return AVERROR_INVALIDDATA;

  901.     }

  902. 

  903.     /* parse the bitstream header */

  904.     bs_hdr = gb.buffer;

  905. 

  906.     if (bytestream2_get_le16(&gb) != 32) {

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

  908.         return AVERROR_INVALIDDATA;

  909.     }

  910. 

  911.     ctx->frame_num   =  frame_num;

  912.     ctx->frame_flags =  bytestream2_get_le16(&gb);

  913.     ctx->data_size   = (bytestream2_get_le32(&gb) + 7) >> 3;

  914.     ctx->cb_offset   =  bytestream2_get_byte(&gb);

  915. 

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

  917.         return 4;

  918.     ctx->data_size = FFMIN(ctx->data_size, buf_size - 16);

  919. 

  920.     bytestream2_skip(&gb, 3); // skip reserved byte and checksum

  921. 

  922.     /* check frame dimensions */

  923.     height = bytestream2_get_le16(&gb);

  924.     width  = bytestream2_get_le16(&gb);

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

  926.         return AVERROR_INVALIDDATA;

  927. 

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

  929.         int res;

  930. 

  931.         ff_dlog(avctx, "Frame dimensions changed!\n");

  932. 

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

  934.             height < 16 || height > 480 ||

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

  936.             av_log(avctx, AV_LOG_ERROR,

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

  938.             return AVERROR_INVALIDDATA;

  939.         }

  940. 

  941.         ctx->width  = width;

  942.         ctx->height = height;

  943. 

  944.         free_frame_buffers(ctx);

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

  946.              return res;

  947.         if ((res = ff_set_dimensions(avctx, width, height)) < 0)

  948.             return res;

  949.     }

  950. 

  951.     y_offset = bytestream2_get_le32(&gb);

  952.     v_offset = bytestream2_get_le32(&gb);

  953.     u_offset = bytestream2_get_le32(&gb);

  954.     bytestream2_skip(&gb, 4);

  955. 

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

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

  958.     starts[0] = y_offset;

  959.     starts[1] = v_offset;

  960.     starts[2] = u_offset;

  961. 

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

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

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

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

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

  967.     }

  968. 

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

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

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

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

  973.         FFMIN3(y_offset, v_offset, u_offset) < gb.buffer - bs_hdr + 16 ||

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

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

  976.         return AVERROR_INVALIDDATA;

  977.     }

  978. 

  979.     ctx->y_data_ptr = bs_hdr + y_offset;

  980.     ctx->v_data_ptr = bs_hdr + v_offset;

  981.     ctx->u_data_ptr = bs_hdr + u_offset;

  982.     ctx->alt_quant  = gb.buffer;

  983. 

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

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

  986.         return 16;

  987.     }

  988. 

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

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

  991.         return AVERROR_PATCHWELCOME;

  992.     }

  993. 

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

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

  996.         return AVERROR_PATCHWELCOME;

  997.     }

  998. 

  999.     return 0;

  1000. }

  1001. 

  1002. 

  1003. /**

  1004.  *  Convert and output the current plane.

  1005.  *  All pixel values will be upsampled by shifting right by one bit.

  1006.  *

  1007.  *  @param[in]  plane        pointer to the descriptor of the plane being processed

  1008.  *  @param[in]  buf_sel      indicates which frame buffer the input data stored in

  1009.  *  @param[out] dst          pointer to the buffer receiving converted pixels

  1010.  *  @param[in]  dst_pitch    pitch for moving to the next y line

  1011.  *  @param[in]  dst_height   output plane height

  1012.  */

  1013. static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst,

  1014.                          int dst_pitch, int dst_height)

  1015. {

  1016.     int             x,y;

  1017.     const uint8_t   *src  = plane->pixels[buf_sel];

  1018.     uint32_t        pitch = plane->pitch;

  1019. 

  1020.     dst_height = FFMIN(dst_height, plane->height);

  1021.     for (y = 0; y < dst_height; y++) {

  1022.         /* convert four pixels at once using SWAR */

  1023.         for (x = 0; x < plane->width >> 2; x++) {

  1024.             AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);

  1025.             src += 4;

  1026.             dst += 4;

  1027.         }

  1028. 

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

  1030.             *dst++ = *src++ << 1;

  1031. 

  1032.         src += pitch     - plane->width;

  1033.         dst += dst_pitch - plane->width;

  1034.     }

  1035. }

  1036. 

  1037. 

  1038. static av_cold int decode_init(AVCodecContext *avctx)

  1039. {

  1040.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1041. 

  1042.     ctx->avctx     = avctx;

  1043.     ctx->width     = avctx->width;

  1044.     ctx->height    = avctx->height;

  1045.     avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  1046. 

  1047.     build_requant_tab();

  1048. 

  1049.     ff_hpeldsp_init(&ctx->hdsp, avctx->flags);

  1050. 

  1051.     allocate_frame_buffers(ctx, avctx);

  1052. 

  1053.     return 0;

  1054. }

  1055. 

  1056. 

  1057. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  1058.                         AVPacket *avpkt)

  1059. {

  1060.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1061.     const uint8_t *buf = avpkt->data;

  1062.     int buf_size       = avpkt->size;

  1063.     AVFrame *frame     = data;

  1064.     int res;

  1065. 

  1066.     res = decode_frame_headers(ctx, avctx, buf, buf_size);

  1067.     if (res < 0)

  1068.         return res;

  1069. 

  1070.     /* skip sync(null) frames */

  1071.     if (res) {

  1072.         // we have processed 16 bytes but no data was decoded

  1073.         *got_frame = 0;

  1074.         return buf_size;

  1075.     }

  1076. 

  1077.     /* skip droppable INTER frames if requested */

  1078.     if (ctx->frame_flags & BS_NONREF &&

  1079.        (avctx->skip_frame >= AVDISCARD_NONREF))

  1080.         return 0;

  1081. 

  1082.     /* skip INTER frames if requested */

  1083.     if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)

  1084.         return 0;

  1085. 

  1086.     /* use BS_BUFFER flag for buffer switching */

  1087.     ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;

  1088. 

  1089.     /* decode luma plane */

  1090.     if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))

  1091.         return res;

  1092. 

  1093.     /* decode chroma planes */

  1094.     if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))

  1095.         return res;

  1096. 

  1097.     if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))

  1098.         return res;

  1099. 

  1100.     if ((res = ff_get_buffer(avctx, frame, 0)) < 0) {

  1101.         av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1102.         return res;

  1103.     }

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

  1131.     .type           = AVMEDIA_TYPE_VIDEO,

  1132.     .id             = AV_CODEC_ID_INDEO3,

  1133.     .priv_data_size = sizeof(Indeo3DecodeContext),

  1134.     .init           = decode_init,

  1135.     .close          = decode_close,

  1136.     .decode         = decode_frame,

  1137.     .capabilities   = AV_CODEC_CAP_DR1,

  1138. };