falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65978 Commits
32 Branches
325MB
Tree: d9e2aceb7f
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'd9e2aceb7f'
${ noResults }
FFmpeg/libavcodec/indeo3.c

1145 lines
41KB
Raw Blame History 

  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 const int8_t offsets[8] = { 1, 1, 2, -3, -3, 3, 4, 4 };

  122.     static const 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 void free_frame_buffers(Indeo3DecodeContext *ctx)

  152. {

  153.     int p;

  154. 

  155.     ctx->width = ctx->height = 0;

  156. 

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

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

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

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

  161.     }

  162. }

  163. 

  164. 

  165. static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,

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

  167. {

  168.     int p, chroma_width, chroma_height;

  169.     int luma_pitch, chroma_pitch, luma_size, chroma_size;

  170. 

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

  172.         luma_height < 16 || luma_height > 480 ||

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

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

  175.                luma_width, luma_height);

  176.         return AVERROR_INVALIDDATA;

  177.     }

  178. 

  179.     ctx->width  = luma_width ;

  180.     ctx->height = luma_height;

  181. 

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

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

  184. 

  185.     luma_pitch   = FFALIGN(luma_width,   16);

  186.     chroma_pitch = FFALIGN(chroma_width, 16);

  187. 

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

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

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

  191. 

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

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

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

  195. 

  196.     /* allocate frame buffers */

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

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

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

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

  201. 

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

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

  204. 

  205.         if (!ctx->planes[p].buffers[0] || !ctx->planes[p].buffers[1]) {

  206.             free_frame_buffers(ctx);

  207.             return AVERROR(ENOMEM);

  208.         }

  209. 

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

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

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

  213. 

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

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

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

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

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

  219.     }

  220. 

  221.     return 0;

  222. }

  223. 

  224. /**

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

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

  227.  *

  228.  *  @param ctx      pointer to the decoder context

  229.  *  @param plane    pointer to the plane descriptor

  230.  *  @param cell     pointer to the cell  descriptor

  231.  */

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

  233. {

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

  235.     uint8_t *src, *dst;

  236. 

  237.     /* setup output and reference pointers */

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

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

  240.     if(cell->mv_ptr){

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

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

  243.     }else

  244.         mv_x= mv_y= 0;

  245. 

  246.     /* -1 because there is an extra line on top for prediction */

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

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

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

  250.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  252.         return AVERROR_INVALIDDATA;

  253.     }

  254. 

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

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

  257. 

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

  259. 

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

  261.         /* copy using 16xH blocks */

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

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

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

  265.         }

  266. 

  267.         /* copy using 8xH blocks */

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

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

  270.             w -= 2;

  271.             src += 8;

  272.             dst += 8;

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

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

  275.             w--;

  276.             src += 4;

  277.             dst += 4;

  278.         }

  279.     }

  280. 

  281.     return 0;

  282. }

  283. 

  284. 

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

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

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

  288. 

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

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

  291. 

  292. 

  293. /*

  294.  *  Replicate each even pixel as follows:

  295.  *  ABCDEFGH -> AACCEEGG

  296.  */

  297. static inline uint64_t replicate64(uint64_t a) {

  298. #if HAVE_BIGENDIAN

  299.     a &= 0xFF00FF00FF00FF00ULL;

  300.     a |= a >> 8;

  301. #else

  302.     a &= 0x00FF00FF00FF00FFULL;

  303.     a |= a << 8;

  304. #endif

  305.     return a;

  306. }

  307. 

  308. static inline uint32_t replicate32(uint32_t a) {

  309. #if HAVE_BIGENDIAN

  310.     a &= 0xFF00FF00UL;

  311.     a |= a >> 8;

  312. #else

  313.     a &= 0x00FF00FFUL;

  314.     a |= a << 8;

  315. #endif

  316.     return a;

  317. }

  318. 

  319. 

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

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

  322.                            int32_t row_offset)

  323. {

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

  325.         AV_WN64A(dst, pix);

  326. }

  327. 

  328. 

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

  330. enum {

  331.     IV3_NOERR       = 0,

  332.     IV3_BAD_RLE     = 1,

  333.     IV3_BAD_DATA    = 2,

  334.     IV3_BAD_COUNTER = 3,

  335.     IV3_UNSUPPORTED = 4,

  336.     IV3_OUT_OF_DATA = 5

  337. };

  338. 

  339. 

  340. #define BUFFER_PRECHECK \

  341. if (*data_ptr >= last_ptr) \

  342.     return IV3_OUT_OF_DATA; \

  343. 

  344. #define RLE_BLOCK_COPY \

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

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

  347. 

  348. #define RLE_BLOCK_COPY_8 \

  349.     pix64 = AV_RN64(ref);\

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

  351.         pix64 = replicate64(pix64);\

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

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

  354.     } else \

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

  356. 

  357. #define RLE_LINES_COPY \

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

  359. 

  360. #define RLE_LINES_COPY_M10 \

  361.     pix64 = AV_RN64(ref);\

  362.     if (is_top_of_cell) {\

  363.         pix64 = replicate64(pix64);\

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

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

  366.     } else \

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

  368. 

  369. #define APPLY_DELTA_4 \

  370.     AV_WN16A(dst + line_offset    ,\

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

  372.     AV_WN16A(dst + line_offset + 2,\

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

  374.     if (mode >= 3) {\

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

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

  377.         } else {\

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

  379.         }\

  380.     }

  381. 

  382. #define APPLY_DELTA_8 \

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

  384.     if (is_top_of_cell) { \

  385.         AV_WN32A(dst + row_offset    , \

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

  387.         AV_WN32A(dst + row_offset + 4, \

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

  389.     } else { \

  390.         AV_WN32A(dst + row_offset    , \

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

  392.         AV_WN32A(dst + row_offset + 4, \

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

  394.     } \

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

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

  397.     /* otherwise - interpolate */\

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

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

  400.     } else \

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

  402. 

  403. 

  404. #define APPLY_DELTA_1011_INTER \

  405.     if (mode == 10) { \

  406.         AV_WN32A(dst                 , \

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

  408.         AV_WN32A(dst + 4             , \

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

  410.         AV_WN32A(dst + row_offset    , \

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

  412.         AV_WN32A(dst + row_offset + 4, \

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

  414.     } else { \

  415.         AV_WN16A(dst                 , \

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

  417.         AV_WN16A(dst + 2             , \

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

  419.         AV_WN16A(dst + row_offset    , \

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

  421.         AV_WN16A(dst + row_offset + 2, \

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

  423.     }

  424. 

  425. 

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

  427.                             uint8_t *block, uint8_t *ref_block,

  428.                             int pitch, int h_zoom, int v_zoom, int mode,

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

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

  431. {

  432.     int           x, y, line, num_lines;

  433.     int           rle_blocks = 0;

  434.     uint8_t       code, *dst, *ref;

  435.     const vqEntry *delta_tab;

  436.     unsigned int  dyad1, dyad2;

  437.     uint64_t      pix64;

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

  439.     int           row_offset, blk_row_offset, line_offset;

  440. 

  441.     row_offset     =  pitch;

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

  443.     line_offset    = v_zoom ? row_offset : 0;

  444. 

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

  446.         return IV3_BAD_DATA;

  447. 

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

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

  450.             ref = ref_block;

  451.             dst = block;

  452. 

  453.             if (rle_blocks > 0) {

  454.                 if (mode <= 4) {

  455.                     RLE_BLOCK_COPY;

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

  457.                     RLE_BLOCK_COPY_8;

  458.                 }

  459.                 rle_blocks--;

  460.             } else {

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

  462.                     num_lines = 1;

  463.                     is_top_of_cell = is_first_row && !line;

  464. 

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

  466.                     if (mode <= 4)

  467.                         delta_tab = delta[line & 1];

  468.                     else

  469.                         delta_tab = delta[1];

  470.                     BUFFER_PRECHECK;

  471.                     code = bytestream_get_byte(data_ptr);

  472.                     if (code < 248) {

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

  474.                             BUFFER_PRECHECK;

  475.                             dyad1 = bytestream_get_byte(data_ptr);

  476.                             dyad2 = code;

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

  478.                                 return IV3_BAD_DATA;

  479.                         } else {

  480.                             /* process QUADS */

  481.                             code -= delta_tab->num_dyads;

  482.                             dyad1 = code / delta_tab->quad_exp;

  483.                             dyad2 = code % delta_tab->quad_exp;

  484.                             if (swap_quads[line & 1])

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

  486.                         }

  487.                         if (mode <= 4) {

  488.                             APPLY_DELTA_4;

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

  490.                             APPLY_DELTA_8;

  491.                         } else {

  492.                             APPLY_DELTA_1011_INTER;

  493.                         }

  494.                     } else {

  495.                         /* process RLE codes */

  496.                         switch (code) {

  497.                         case RLE_ESC_FC:

  498.                             skip_flag  = 0;

  499.                             rle_blocks = 1;

  500.                             code       = 253;

  501.                             /* FALLTHROUGH */

  502.                         case RLE_ESC_FF:

  503.                         case RLE_ESC_FE:

  504.                         case RLE_ESC_FD:

  505.                             num_lines = 257 - code - line;

  506.                             if (num_lines <= 0)

  507.                                 return IV3_BAD_RLE;

  508.                             if (mode <= 4) {

  509.                                 RLE_LINES_COPY;

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

  511.                                 RLE_LINES_COPY_M10;

  512.                             }

  513.                             break;

  514.                         case RLE_ESC_FB:

  515.                             BUFFER_PRECHECK;

  516.                             code = bytestream_get_byte(data_ptr);

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

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

  519.                                 return IV3_BAD_COUNTER;

  520.                             skip_flag = code & 0x20;

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

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

  523.                                 if (mode <= 4) {

  524.                                     RLE_LINES_COPY;

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

  526.                                     RLE_LINES_COPY_M10;

  527.                                 }

  528.                             }

  529.                             break;

  530.                         case RLE_ESC_F9:

  531.                             skip_flag  = 1;

  532.                             rle_blocks = 1;

  533.                             /* FALLTHROUGH */

  534.                         case RLE_ESC_FA:

  535.                             if (line)

  536.                                 return IV3_BAD_RLE;

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

  538.                             if (cell->mv_ptr) {

  539.                                 if (mode <= 4) {

  540.                                     RLE_LINES_COPY;

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

  542.                                     RLE_LINES_COPY_M10;

  543.                                 }

  544.                             }

  545.                             break;

  546.                         default:

  547.                             return IV3_UNSUPPORTED;

  548.                         }

  549.                     }

  550. 

  551.                     line += num_lines;

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

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

  554.                 }

  555.             }

  556. 

  557.             /* move to next horizontal block */

  558.             block     += 4 << h_zoom;

  559.             ref_block += 4 << h_zoom;

  560.         }

  561. 

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

  563.         ref_block += blk_row_offset;

  564.         block     += blk_row_offset;

  565.     }

  566.     return IV3_NOERR;

  567. }

  568. 

  569. 

  570. /**

  571.  *  Decode a vector-quantized cell.

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

  573.  *  with which a cell can be encoded.

  574.  *

  575.  *  @param ctx      pointer to the decoder context

  576.  *  @param avctx    ptr to the AVCodecContext

  577.  *  @param plane    pointer to the plane descriptor

  578.  *  @param cell     pointer to the cell  descriptor

  579.  *  @param data_ptr pointer to the compressed data

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

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

  582.  */

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

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

  585.                        const uint8_t *last_ptr)

  586. {

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

  588.     int           zoom_fac;

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

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

  591.     const vqEntry *delta[2];

  592.     const uint8_t *data_start = data_ptr;

  593. 

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

  595.     code     = *data_ptr++;

  596.     mode     = code >> 4;

  597.     vq_index = code & 0xF;

  598. 

  599.     /* setup output and reference pointers */

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

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

  602. 

  603.     if (!cell->mv_ptr) {

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

  605.         ref_block = block - plane->pitch;

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

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

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

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

  610.         if (ret < 0)

  611.             return ret;

  612.     } else {

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

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

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

  616. 

  617.         /* -1 because there is an extra line on top for prediction */

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

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

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

  621.             av_log(ctx->avctx, AV_LOG_ERROR,

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

  623.             return AVERROR_INVALIDDATA;

  624.         }

  625. 

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

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

  628.     }

  629. 

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

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

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

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

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

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

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

  637.     } else {

  638.         vq_index += ctx->cb_offset;

  639.         prim_indx = second_indx = vq_index;

  640.     }

  641. 

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

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

  644.                prim_indx, second_indx);

  645.         return AVERROR_INVALIDDATA;

  646.     }

  647. 

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

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

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

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

  652. 

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

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

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

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

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

  658.     }

  659. 

  660.     error = IV3_NOERR;

  661. 

  662.     switch (mode) {

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

  664.     case 1:

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

  666.     case 4:

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

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

  669.             return AVERROR_INVALIDDATA;

  670.         }

  671. 

  672.         zoom_fac = mode >= 3;

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

  674.                                  0, zoom_fac, mode, delta, swap_quads,

  675.                                  &data_ptr, last_ptr);

  676.         break;

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

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

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

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

  681.                                      1, 1, mode, delta, swap_quads,

  682.                                      &data_ptr, last_ptr);

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

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

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

  686.                return AVERROR_INVALIDDATA;

  687.             }

  688. 

  689.             zoom_fac = mode == 10;

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

  691.                                      zoom_fac, 1, mode, delta, swap_quads,

  692.                                      &data_ptr, last_ptr);

  693.         }

  694.         break;

  695.     default:

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

  697.         return AVERROR_INVALIDDATA;

  698.     }//switch mode

  699. 

  700.     switch (error) {

  701.     case IV3_BAD_RLE:

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

  703.                mode, data_ptr[-1]);

  704.         return AVERROR_INVALIDDATA;

  705.     case IV3_BAD_DATA:

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

  707.         return AVERROR_INVALIDDATA;

  708.     case IV3_BAD_COUNTER:

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

  710.         return AVERROR_INVALIDDATA;

  711.     case IV3_UNSUPPORTED:

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

  713.         return AVERROR_INVALIDDATA;

  714.     case IV3_OUT_OF_DATA:

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

  716.         return AVERROR_INVALIDDATA;

  717.     }

  718. 

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

  720. }

  721. 

  722. 

  723. /* Binary tree codes. */

  724. enum {

  725.     H_SPLIT    = 0,

  726.     V_SPLIT    = 1,

  727.     INTRA_NULL = 2,

  728.     INTER_DATA = 3

  729. };

  730. 

  731. 

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

  733. 

  734. #define UPDATE_BITPOS(n) \

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

  736.     ctx->need_resync = 1

  737. 

  738. #define RESYNC_BITSTREAM \

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

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

  741.         ctx->skip_bits   = 0;                                  \

  742.         ctx->need_resync = 0;                                  \

  743.     }

  744. 

  745. #define CHECK_CELL \

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

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

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

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

  750.         return AVERROR_INVALIDDATA;                                                              \

  751.     }

  752. 

  753. 

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

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

  756.                          const int depth, const int strip_width)

  757. {

  758.     Cell    curr_cell;

  759.     int     bytes_used, ret;

  760. 

  761.     if (depth <= 0) {

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

  763.         return AVERROR_INVALIDDATA; // unwind recursion

  764.     }

  765. 

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

  767.     if (code == H_SPLIT) {

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

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

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

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

  772.             return AVERROR_INVALIDDATA;

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

  774.         if (curr_cell.width > strip_width) {

  775.             /* split strip */

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

  777.         } else

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

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

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

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

  782.             return AVERROR_INVALIDDATA;

  783.     }

  784. 

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

  786.         RESYNC_BITSTREAM;

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

  788.         case H_SPLIT:

  789.         case V_SPLIT:

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

  791.                 return AVERROR_INVALIDDATA;

  792.             break;

  793.         case INTRA_NULL:

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

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

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

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

  798.                 RESYNC_BITSTREAM;

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

  800.                 if (code >= 2) {

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

  802.                     return AVERROR_INVALIDDATA;

  803.                 }

  804.                 if (code == 1)

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

  806. 

  807.                 CHECK_CELL

  808.                 if (!curr_cell.mv_ptr)

  809.                     return AVERROR_INVALIDDATA;

  810. 

  811.                 ret = copy_cell(ctx, plane, &curr_cell);

  812.                 return ret;

  813.             }

  814.             break;

  815.         case INTER_DATA:

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

  817.                 unsigned mv_idx;

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

  819.                 if (!ctx->need_resync)

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

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

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

  823.                     return AVERROR_INVALIDDATA;

  824.                 }

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

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

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

  828.                     return AVERROR_INVALIDDATA;

  829.                 }

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

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

  832.                 UPDATE_BITPOS(8);

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

  834.                 if (!ctx->need_resync)

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

  836. 

  837.                 CHECK_CELL

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

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

  840.                 if (bytes_used < 0)

  841.                     return AVERROR_INVALIDDATA;

  842. 

  843.                 UPDATE_BITPOS(bytes_used << 3);

  844.                 ctx->next_cell_data += bytes_used;

  845.                 return 0;

  846.             }

  847.             break;

  848.         }

  849.     }//while

  850. 

  851.     return AVERROR_INVALIDDATA;

  852. }

  853. 

  854. 

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

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

  857.                         int32_t strip_width)

  858. {

  859.     Cell            curr_cell;

  860.     unsigned        num_vectors;

  861. 

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

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

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

  865.     if (num_vectors > 256) {

  866.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  868.         return AVERROR_INVALIDDATA;

  869.     }

  870.     if (num_vectors * 2 > data_size)

  871.         return AVERROR_INVALIDDATA;

  872. 

  873.     ctx->num_vectors = num_vectors;

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

  875. 

  876.     /* init the bitreader */

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

  878.     ctx->skip_bits   = 0;

  879.     ctx->need_resync = 0;

  880. 

  881.     ctx->last_byte = data + data_size;

  882. 

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

  884.     curr_cell.xpos   = curr_cell.ypos = 0;

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

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

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

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

  889. 

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

  891. }

  892. 

  893. 

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

  895. 

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

  897.                                 const uint8_t *buf, int buf_size)

  898. {

  899.     GetByteContext gb;

  900.     const uint8_t   *bs_hdr;

  901.     uint32_t        frame_num, word2, check_sum, data_size;

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

  903.     uint16_t        height, width;

  904.     int             i, j;

  905. 

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

  907. 

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

  909.     frame_num = bytestream2_get_le32(&gb);

  910.     word2     = bytestream2_get_le32(&gb);

  911.     check_sum = bytestream2_get_le32(&gb);

  912.     data_size = bytestream2_get_le32(&gb);

  913. 

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

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

  916.         return AVERROR_INVALIDDATA;

  917.     }

  918. 

  919.     /* parse the bitstream header */

  920.     bs_hdr = gb.buffer;

  921. 

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

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

  924.         return AVERROR_INVALIDDATA;

  925.     }

  926. 

  927.     ctx->frame_num   =  frame_num;

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

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

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

  931. 

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

  933.         return 4;

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

  935. 

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

  937. 

  938.     /* check frame dimensions */

  939.     height = bytestream2_get_le16(&gb);

  940.     width  = bytestream2_get_le16(&gb);

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

  942.         return AVERROR_INVALIDDATA;

  943. 

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

  945.         int res;

  946. 

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

  948. 

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

  950.             height < 16 || height > 480 ||

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

  952.             av_log(avctx, AV_LOG_ERROR,

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

  954.             return AVERROR_INVALIDDATA;

  955.         }

  956.         free_frame_buffers(ctx);

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

  958.              return res;

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

  960.             return res;

  961.     }

  962. 

  963.     y_offset = bytestream2_get_le32(&gb);

  964.     v_offset = bytestream2_get_le32(&gb);

  965.     u_offset = bytestream2_get_le32(&gb);

  966.     bytestream2_skip(&gb, 4);

  967. 

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

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

  970.     starts[0] = y_offset;

  971.     starts[1] = v_offset;

  972.     starts[2] = u_offset;

  973. 

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

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

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

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

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

  979.     }

  980. 

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

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

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

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

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

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

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

  988.         return AVERROR_INVALIDDATA;

  989.     }

  990. 

  991.     ctx->y_data_ptr = bs_hdr + y_offset;

  992.     ctx->v_data_ptr = bs_hdr + v_offset;

  993.     ctx->u_data_ptr = bs_hdr + u_offset;

  994.     ctx->alt_quant  = gb.buffer;

  995. 

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

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

  998.         return 16;

  999.     }

  1000. 

  1001.     if (ctx->frame_flags & BS_8BIT_PEL) {

  1002.         avpriv_request_sample(avctx, "8-bit pixel format");

  1003.         return AVERROR_PATCHWELCOME;

  1004.     }

  1005. 

  1006.     if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {

  1007.         avpriv_request_sample(avctx, "Halfpel motion vectors");

  1008.         return AVERROR_PATCHWELCOME;

  1009.     }

  1010. 

  1011.     return 0;

  1012. }

  1013. 

  1014. 

  1015. /**

  1016.  *  Convert and output the current plane.

  1017.  *  All pixel values will be upsampled by shifting right by one bit.

  1018.  *

  1019.  *  @param[in]  plane        pointer to the descriptor of the plane being processed

  1020.  *  @param[in]  buf_sel      indicates which frame buffer the input data stored in

  1021.  *  @param[out] dst          pointer to the buffer receiving converted pixels

  1022.  *  @param[in]  dst_pitch    pitch for moving to the next y line

  1023.  *  @param[in]  dst_height   output plane height

  1024.  */

  1025. static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst,

  1026.                          int dst_pitch, int dst_height)

  1027. {

  1028.     int             x,y;

  1029.     const uint8_t   *src  = plane->pixels[buf_sel];

  1030.     uint32_t        pitch = plane->pitch;

  1031. 

  1032.     dst_height = FFMIN(dst_height, plane->height);

  1033.     for (y = 0; y < dst_height; y++) {

  1034.         /* convert four pixels at once using SWAR */

  1035.         for (x = 0; x < plane->width >> 2; x++) {

  1036.             AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);

  1037.             src += 4;

  1038.             dst += 4;

  1039.         }

  1040. 

  1041.         for (x <<= 2; x < plane->width; x++)

  1042.             *dst++ = *src++ << 1;

  1043. 

  1044.         src += pitch     - plane->width;

  1045.         dst += dst_pitch - plane->width;

  1046.     }

  1047. }

  1048. 

  1049. 

  1050. static av_cold int decode_init(AVCodecContext *avctx)

  1051. {

  1052.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1053. 

  1054.     ctx->avctx     = avctx;

  1055.     avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  1056. 

  1057.     build_requant_tab();

  1058. 

  1059.     ff_hpeldsp_init(&ctx->hdsp, avctx->flags);

  1060. 

  1061.     return allocate_frame_buffers(ctx, avctx, avctx->width, avctx->height);

  1062. }

  1063. 

  1064. 

  1065. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  1066.                         AVPacket *avpkt)

  1067. {

  1068.     Indeo3DecodeContext *ctx = avctx->priv_data;

  1069.     const uint8_t *buf = avpkt->data;

  1070.     int buf_size       = avpkt->size;

  1071.     AVFrame *frame     = data;

  1072.     int res;

  1073. 

  1074.     res = decode_frame_headers(ctx, avctx, buf, buf_size);

  1075.     if (res < 0)

  1076.         return res;

  1077. 

  1078.     /* skip sync(null) frames */

  1079.     if (res) {

  1080.         // we have processed 16 bytes but no data was decoded

  1081.         *got_frame = 0;

  1082.         return buf_size;

  1083.     }

  1084. 

  1085.     /* skip droppable INTER frames if requested */

  1086.     if (ctx->frame_flags & BS_NONREF &&

  1087.        (avctx->skip_frame >= AVDISCARD_NONREF))

  1088.         return 0;

  1089. 

  1090.     /* skip INTER frames if requested */

  1091.     if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)

  1092.         return 0;

  1093. 

  1094.     /* use BS_BUFFER flag for buffer switching */

  1095.     ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;

  1096. 

  1097.     if ((res = ff_get_buffer(avctx, frame, 0)) < 0)

  1098.         return res;

  1099. 

  1100.     /* decode luma plane */

  1101.     if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))

  1102.         return res;

  1103. 

  1104.     /* decode chroma planes */

  1105.     if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))

  1106.         return res;

  1107. 

  1108.     if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))

  1109.         return res;

  1110. 

  1111.     output_plane(&ctx->planes[0], ctx->buf_sel,

  1112.                  frame->data[0], frame->linesize[0],

  1113.                  avctx->height);

  1114.     output_plane(&ctx->planes[1], ctx->buf_sel,

  1115.                  frame->data[1], frame->linesize[1],

  1116.                  (avctx->height + 3) >> 2);

  1117.     output_plane(&ctx->planes[2], ctx->buf_sel,

  1118.                  frame->data[2], frame->linesize[2],

  1119.                  (avctx->height + 3) >> 2);

  1120. 

  1121.     *got_frame = 1;

  1122. 

  1123.     return buf_size;

  1124. }

  1125. 

  1126. 

  1127. static av_cold int decode_close(AVCodecContext *avctx)

  1128. {

  1129.     free_frame_buffers(avctx->priv_data);

  1130. 

  1131.     return 0;

  1132. }

  1133. 

  1134. AVCodec ff_indeo3_decoder = {

  1135.     .name           = "indeo3",

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

  1137.     .type           = AVMEDIA_TYPE_VIDEO,

  1138.     .id             = AV_CODEC_ID_INDEO3,

  1139.     .priv_data_size = sizeof(Indeo3DecodeContext),

  1140.     .init           = decode_init,

  1141.     .close          = decode_close,

  1142.     .decode         = decode_frame,

  1143.     .capabilities   = CODEC_CAP_DR1,

  1144. };