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FFmpeg/libavcodec/sanm.c

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  1. /*

  2.  * LucasArts Smush video decoder

  3.  * Copyright (c) 2006 Cyril Zorin

  4.  * Copyright (c) 2011 Konstantin Shishkov

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

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

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

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

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

  19.  * License along with FFmpeg; if not, write to the Free Software

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

  21.  */

  22. 

  23. // #define DEBUG 1

  24. 

  25. #include "avcodec.h"

  26. #include "copy_block.h"

  27. #include "bytestream.h"

  28. #include "internal.h"

  29. #include "libavutil/bswap.h"

  30. #include "libavutil/imgutils.h"

  31. #include "sanm_data.h"

  32. #include "libavutil/avassert.h"

  33. 

  34. #define NGLYPHS 256

  35. 

  36. typedef struct {

  37.     AVCodecContext *avctx;

  38.     GetByteContext gb;

  39. 

  40.     int version, subversion;

  41.     uint32_t pal[256];

  42.     int16_t delta_pal[768];

  43. 

  44.     int pitch;

  45.     int width, height;

  46.     int aligned_width, aligned_height;

  47.     int prev_seq;

  48. 

  49.     AVFrame *frame;

  50.     uint16_t *frm0, *frm1, *frm2;

  51.     uint8_t *stored_frame;

  52.     uint32_t frm0_size, frm1_size, frm2_size;

  53.     uint32_t stored_frame_size;

  54. 

  55.     uint8_t *rle_buf;

  56.     unsigned int rle_buf_size;

  57. 

  58.     int rotate_code;

  59. 

  60.     long npixels, buf_size;

  61. 

  62.     uint16_t codebook[256];

  63.     uint16_t small_codebook[4];

  64. 

  65.     int8_t p4x4glyphs[NGLYPHS][16];

  66.     int8_t p8x8glyphs[NGLYPHS][64];

  67. } SANMVideoContext;

  68. 

  69. typedef struct {

  70.     int seq_num, codec, rotate_code, rle_output_size;

  71. 

  72.     uint16_t bg_color;

  73.     uint32_t width, height;

  74. } SANMFrameHeader;

  75. 

  76. enum GlyphEdge {

  77.     LEFT_EDGE,

  78.     TOP_EDGE,

  79.     RIGHT_EDGE,

  80.     BOTTOM_EDGE,

  81.     NO_EDGE

  82. };

  83. 

  84. enum GlyphDir {

  85.     DIR_LEFT,

  86.     DIR_UP,

  87.     DIR_RIGHT,

  88.     DIR_DOWN,

  89.     NO_DIR

  90. };

  91. 

  92. /**

  93.  * Return enum GlyphEdge of box where point (x, y) lies.

  94.  *

  95.  * @param x x point coordinate

  96.  * @param y y point coordinate

  97.  * @param edge_size box width/height.

  98.  */

  99. static enum GlyphEdge which_edge(int x, int y, int edge_size)

  100. {

  101.     const int edge_max = edge_size - 1;

  102. 

  103.     if (!y) {

  104.         return BOTTOM_EDGE;

  105.     } else if (y == edge_max) {

  106.         return TOP_EDGE;

  107.     } else if (!x) {

  108.         return LEFT_EDGE;

  109.     } else if (x == edge_max) {

  110.         return RIGHT_EDGE;

  111.     } else {

  112.         return NO_EDGE;

  113.     }

  114. }

  115. 

  116. static enum GlyphDir which_direction(enum GlyphEdge edge0, enum GlyphEdge edge1)

  117. {

  118.     if ((edge0 == LEFT_EDGE && edge1 == RIGHT_EDGE) ||

  119.         (edge1 == LEFT_EDGE && edge0 == RIGHT_EDGE) ||

  120.         (edge0 == BOTTOM_EDGE && edge1 != TOP_EDGE) ||

  121.         (edge1 == BOTTOM_EDGE && edge0 != TOP_EDGE)) {

  122.         return DIR_UP;

  123.     } else if ((edge0 == TOP_EDGE && edge1 != BOTTOM_EDGE) ||

  124.                (edge1 == TOP_EDGE && edge0 != BOTTOM_EDGE)) {

  125.         return DIR_DOWN;

  126.     } else if ((edge0 == LEFT_EDGE && edge1 != RIGHT_EDGE) ||

  127.                (edge1 == LEFT_EDGE && edge0 != RIGHT_EDGE)) {

  128.         return DIR_LEFT;

  129.     } else if ((edge0 == TOP_EDGE && edge1 == BOTTOM_EDGE) ||

  130.                (edge1 == TOP_EDGE && edge0 == BOTTOM_EDGE) ||

  131.                (edge0 == RIGHT_EDGE && edge1 != LEFT_EDGE) ||

  132.                (edge1 == RIGHT_EDGE && edge0 != LEFT_EDGE)) {

  133.         return DIR_RIGHT;

  134.     }

  135. 

  136.     return NO_DIR;

  137. }

  138. 

  139. /**

  140.  * Interpolate two points.

  141.  */

  142. static void interp_point(int8_t *points, int x0, int y0, int x1, int y1,

  143.                          int pos, int npoints)

  144. {

  145.     if (npoints) {

  146.         points[0] = (x0 * pos + x1 * (npoints - pos) + (npoints >> 1)) / npoints;

  147.         points[1] = (y0 * pos + y1 * (npoints - pos) + (npoints >> 1)) / npoints;

  148.     } else {

  149.         points[0] = x0;

  150.         points[1] = y0;

  151.     }

  152. }

  153. 

  154. /**

  155.  * Construct glyphs by iterating through vectors coordinates.

  156.  *

  157.  * @param pglyphs pointer to table where glyphs are stored

  158.  * @param xvec pointer to x component of vectors coordinates

  159.  * @param yvec pointer to y component of vectors coordinates

  160.  * @param side_length glyph width/height.

  161.  */

  162. static void make_glyphs(int8_t *pglyphs, const int8_t *xvec, const int8_t *yvec,

  163.                         const int side_length)

  164. {

  165.     const int glyph_size = side_length * side_length;

  166.     int8_t *pglyph = pglyphs;

  167. 

  168.     int i, j;

  169.     for (i = 0; i < GLYPH_COORD_VECT_SIZE; i++) {

  170.         int x0    = xvec[i];

  171.         int y0    = yvec[i];

  172.         enum GlyphEdge edge0 = which_edge(x0, y0, side_length);

  173. 

  174.         for (j = 0; j < GLYPH_COORD_VECT_SIZE; j++, pglyph += glyph_size) {

  175.             int x1      = xvec[j];

  176.             int y1      = yvec[j];

  177.             enum GlyphEdge edge1   = which_edge(x1, y1, side_length);

  178.             enum GlyphDir  dir     = which_direction(edge0, edge1);

  179.             int npoints = FFMAX(FFABS(x1 - x0), FFABS(y1 - y0));

  180.             int ipoint;

  181. 

  182.             for (ipoint = 0; ipoint <= npoints; ipoint++) {

  183.                 int8_t point[2];

  184.                 int irow, icol;

  185. 

  186.                 interp_point(point, x0, y0, x1, y1, ipoint, npoints);

  187. 

  188.                 switch (dir) {

  189.                 case DIR_UP:

  190.                     for (irow = point[1]; irow >= 0; irow--)

  191.                         pglyph[point[0] + irow * side_length] = 1;

  192.                     break;

  193. 

  194.                 case DIR_DOWN:

  195.                     for (irow = point[1]; irow < side_length; irow++)

  196.                         pglyph[point[0] + irow * side_length] = 1;

  197.                     break;

  198. 

  199.                 case DIR_LEFT:

  200.                     for (icol = point[0]; icol >= 0; icol--)

  201.                         pglyph[icol + point[1] * side_length] = 1;

  202.                     break;

  203. 

  204.                 case DIR_RIGHT:

  205.                     for (icol = point[0]; icol < side_length; icol++)

  206.                         pglyph[icol + point[1] * side_length] = 1;

  207.                     break;

  208.                 }

  209.             }

  210.         }

  211.     }

  212. }

  213. 

  214. static void init_sizes(SANMVideoContext *ctx, int width, int height)

  215. {

  216.     ctx->width   = width;

  217.     ctx->height  = height;

  218.     ctx->npixels = width * height;

  219. 

  220.     ctx->aligned_width  = FFALIGN(width,  8);

  221.     ctx->aligned_height = FFALIGN(height, 8);

  222. 

  223.     ctx->buf_size = ctx->aligned_width * ctx->aligned_height * sizeof(ctx->frm0[0]);

  224.     ctx->pitch    = width;

  225. }

  226. 

  227. static void destroy_buffers(SANMVideoContext *ctx)

  228. {

  229.     av_freep(&ctx->frm0);

  230.     av_freep(&ctx->frm1);

  231.     av_freep(&ctx->frm2);

  232.     av_freep(&ctx->stored_frame);

  233.     av_freep(&ctx->rle_buf);

  234.     ctx->frm0_size =

  235.     ctx->frm1_size =

  236.     ctx->frm2_size = 0;

  237. }

  238. 

  239. static av_cold int init_buffers(SANMVideoContext *ctx)

  240. {

  241.     av_fast_padded_malloc(&ctx->frm0, &ctx->frm0_size, ctx->buf_size);

  242.     av_fast_padded_malloc(&ctx->frm1, &ctx->frm1_size, ctx->buf_size);

  243.     av_fast_padded_malloc(&ctx->frm2, &ctx->frm2_size, ctx->buf_size);

  244.     if (!ctx->version)

  245.         av_fast_padded_malloc(&ctx->stored_frame, &ctx->stored_frame_size, ctx->buf_size);

  246. 

  247.     if (!ctx->frm0 || !ctx->frm1 || !ctx->frm2 || (!ctx->stored_frame && !ctx->version)) {

  248.         destroy_buffers(ctx);

  249.         return AVERROR(ENOMEM);

  250.     }

  251. 

  252.     return 0;

  253. }

  254. 

  255. static void rotate_bufs(SANMVideoContext *ctx, int rotate_code)

  256. {

  257.     av_dlog(ctx->avctx, "rotate %d\n", rotate_code);

  258.     if (rotate_code == 2)

  259.         FFSWAP(uint16_t*, ctx->frm1, ctx->frm2);

  260.     FFSWAP(uint16_t*, ctx->frm2, ctx->frm0);

  261. }

  262. 

  263. static av_cold int decode_init(AVCodecContext *avctx)

  264. {

  265.     SANMVideoContext *ctx = avctx->priv_data;

  266. 

  267.     ctx->avctx     = avctx;

  268.     ctx->version   = !avctx->extradata_size;

  269. 

  270.     avctx->pix_fmt = ctx->version ? AV_PIX_FMT_RGB565 : AV_PIX_FMT_PAL8;

  271. 

  272.     init_sizes(ctx, avctx->width, avctx->height);

  273.     if (init_buffers(ctx)) {

  274.         av_log(avctx, AV_LOG_ERROR, "error allocating buffers\n");

  275.         return AVERROR(ENOMEM);

  276.     }

  277. 

  278.     make_glyphs(ctx->p4x4glyphs[0], glyph4_x, glyph4_y, 4);

  279.     make_glyphs(ctx->p8x8glyphs[0], glyph8_x, glyph8_y, 8);

  280. 

  281.     if (!ctx->version) {

  282.         int i;

  283. 

  284.         if (avctx->extradata_size < 1026) {

  285.             av_log(avctx, AV_LOG_ERROR, "not enough extradata\n");

  286.             return AVERROR_INVALIDDATA;

  287.         }

  288. 

  289.         ctx->subversion = AV_RL16(avctx->extradata);

  290.         for (i = 0; i < 256; i++)

  291.             ctx->pal[i] = 0xFFU << 24 | AV_RL32(avctx->extradata + 2 + i * 4);

  292.     }

  293. 

  294.     return 0;

  295. }

  296. 

  297. static av_cold int decode_end(AVCodecContext *avctx)

  298. {

  299.     SANMVideoContext *ctx = avctx->priv_data;

  300. 

  301.     destroy_buffers(ctx);

  302. 

  303.     return 0;

  304. }

  305. 

  306. static int rle_decode(SANMVideoContext *ctx, uint8_t *dst, const int out_size)

  307. {

  308.     int opcode, color, run_len, left = out_size;

  309. 

  310.     while (left > 0) {

  311.         opcode = bytestream2_get_byte(&ctx->gb);

  312.         run_len = (opcode >> 1) + 1;

  313.         if (run_len > left || bytestream2_get_bytes_left(&ctx->gb) <= 0)

  314.             return AVERROR_INVALIDDATA;

  315. 

  316.         if (opcode & 1) {

  317.             color = bytestream2_get_byte(&ctx->gb);

  318.             memset(dst, color, run_len);

  319.         } else {

  320.             if (bytestream2_get_bytes_left(&ctx->gb) < run_len)

  321.                 return AVERROR_INVALIDDATA;

  322.             bytestream2_get_bufferu(&ctx->gb, dst, run_len);

  323.         }

  324. 

  325.         dst  += run_len;

  326.         left -= run_len;

  327.     }

  328. 

  329.     return 0;

  330. }

  331. 

  332. static int old_codec1(SANMVideoContext *ctx, int top,

  333.                       int left, int width, int height)

  334. {

  335.     uint8_t *dst = ((uint8_t*)ctx->frm0) + left + top * ctx->pitch;

  336.     int i, j, len, flag, code, val, pos, end;

  337. 

  338.     for (i = 0; i < height; i++) {

  339.         pos = 0;

  340. 

  341.         if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  342.             return AVERROR_INVALIDDATA;

  343. 

  344.         len = bytestream2_get_le16u(&ctx->gb);

  345.         end = bytestream2_tell(&ctx->gb) + len;

  346. 

  347.         while (bytestream2_tell(&ctx->gb) < end) {

  348.             if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  349.                 return AVERROR_INVALIDDATA;

  350. 

  351.             code = bytestream2_get_byteu(&ctx->gb);

  352.             flag = code & 1;

  353.             code = (code >> 1) + 1;

  354.             if (pos + code > width)

  355.                 return AVERROR_INVALIDDATA;

  356.             if (flag) {

  357.                 val = bytestream2_get_byteu(&ctx->gb);

  358.                 if (val)

  359.                     memset(dst + pos, val, code);

  360.                 pos += code;

  361.             } else {

  362.                 if (bytestream2_get_bytes_left(&ctx->gb) < code)

  363.                     return AVERROR_INVALIDDATA;

  364.                 for (j = 0; j < code; j++) {

  365.                     val = bytestream2_get_byteu(&ctx->gb);

  366.                     if (val)

  367.                         dst[pos] = val;

  368.                     pos++;

  369.                 }

  370.             }

  371.         }

  372.         dst += ctx->pitch;

  373.     }

  374.     ctx->rotate_code = 0;

  375. 

  376.     return 0;

  377. }

  378. 

  379. static inline void codec37_mv(uint8_t *dst, const uint8_t *src,

  380.                               int height, int stride, int x, int y)

  381. {

  382.     int pos, i, j;

  383. 

  384.     pos = x + y * stride;

  385.     for (j = 0; j < 4; j++) {

  386.         for (i = 0; i < 4; i++) {

  387.             if ((pos + i) < 0 || (pos + i) >= height * stride)

  388.                 dst[i] = 0;

  389.             else

  390.                 dst[i] = src[i];

  391.         }

  392.         dst += stride;

  393.         src += stride;

  394.         pos += stride;

  395.     }

  396. }

  397. 

  398. static int old_codec37(SANMVideoContext *ctx, int top,

  399.                        int left, int width, int height)

  400. {

  401.     int stride = ctx->pitch;

  402.     int i, j, k, t;

  403.     int skip_run = 0;

  404.     int compr, mvoff, seq, flags;

  405.     uint32_t decoded_size;

  406.     uint8_t *dst, *prev;

  407. 

  408.     compr        = bytestream2_get_byte(&ctx->gb);

  409.     mvoff        = bytestream2_get_byte(&ctx->gb);

  410.     seq          = bytestream2_get_le16(&ctx->gb);

  411.     decoded_size = bytestream2_get_le32(&ctx->gb);

  412.     bytestream2_skip(&ctx->gb, 4);

  413.     flags        = bytestream2_get_byte(&ctx->gb);

  414.     bytestream2_skip(&ctx->gb, 3);

  415. 

  416.     if (decoded_size > ctx->height * stride - left - top * stride) {

  417.         decoded_size = ctx->height * stride - left - top * stride;

  418.         av_log(ctx->avctx, AV_LOG_WARNING, "decoded size is too large\n");

  419.     }

  420. 

  421.     ctx->rotate_code = 0;

  422. 

  423.     if (((seq & 1) || !(flags & 1)) && (compr && compr != 2))

  424.         rotate_bufs(ctx, 1);

  425. 

  426.     dst  = ((uint8_t*)ctx->frm0) + left + top * stride;

  427.     prev = ((uint8_t*)ctx->frm2) + left + top * stride;

  428. 

  429.     if (mvoff > 2) {

  430.         av_log(ctx->avctx, AV_LOG_ERROR, "invalid motion base value %d\n", mvoff);

  431.         return AVERROR_INVALIDDATA;

  432.     }

  433.     av_dlog(ctx->avctx, "compression %d\n", compr);

  434.     switch (compr) {

  435.     case 0:

  436.         for (i = 0; i < height; i++) {

  437.             bytestream2_get_buffer(&ctx->gb, dst, width);

  438.             dst += stride;

  439.         }

  440.         memset(ctx->frm1, 0, ctx->height * stride);

  441.         memset(ctx->frm2, 0, ctx->height * stride);

  442.         break;

  443.     case 2:

  444.         if (rle_decode(ctx, dst, decoded_size))

  445.             return AVERROR_INVALIDDATA;

  446.         memset(ctx->frm1, 0, ctx->frm1_size);

  447.         memset(ctx->frm2, 0, ctx->frm2_size);

  448.         break;

  449.     case 3:

  450.     case 4:

  451.         if (flags & 4) {

  452.             for (j = 0; j < height; j += 4) {

  453.                 for (i = 0; i < width; i += 4) {

  454.                     int code;

  455.                     if (skip_run) {

  456.                         skip_run--;

  457.                         copy_block4(dst + i, prev + i, stride, stride, 4);

  458.                         continue;

  459.                     }

  460.                     if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  461.                         return AVERROR_INVALIDDATA;

  462.                     code = bytestream2_get_byteu(&ctx->gb);

  463.                     switch (code) {

  464.                     case 0xFF:

  465.                         if (bytestream2_get_bytes_left(&ctx->gb) < 16)

  466.                             return AVERROR_INVALIDDATA;

  467.                         for (k = 0; k < 4; k++)

  468.                             bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);

  469.                         break;

  470.                     case 0xFE:

  471.                         if (bytestream2_get_bytes_left(&ctx->gb) < 4)

  472.                             return AVERROR_INVALIDDATA;

  473.                         for (k = 0; k < 4; k++)

  474.                             memset(dst + i + k * stride, bytestream2_get_byteu(&ctx->gb), 4);

  475.                         break;

  476.                     case 0xFD:

  477.                         if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  478.                             return AVERROR_INVALIDDATA;

  479.                         t = bytestream2_get_byteu(&ctx->gb);

  480.                         for (k = 0; k < 4; k++)

  481.                             memset(dst + i + k * stride, t, 4);

  482.                         break;

  483.                     default:

  484.                         if (compr == 4 && !code) {

  485.                             if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  486.                                 return AVERROR_INVALIDDATA;

  487.                             skip_run = bytestream2_get_byteu(&ctx->gb) + 1;

  488.                             i -= 4;

  489.                         } else {

  490.                             int mx, my;

  491. 

  492.                             mx = c37_mv[(mvoff * 255 + code) * 2    ];

  493.                             my = c37_mv[(mvoff * 255 + code) * 2 + 1];

  494.                             codec37_mv(dst + i, prev + i + mx + my * stride,

  495.                                        ctx->height, stride, i + mx, j + my);

  496.                         }

  497.                     }

  498.                 }

  499.                 dst  += stride * 4;

  500.                 prev += stride * 4;

  501.             }

  502.         } else {

  503.             for (j = 0; j < height; j += 4) {

  504.                 for (i = 0; i < width; i += 4) {

  505.                     int code;

  506.                     if (skip_run) {

  507.                         skip_run--;

  508.                         copy_block4(dst + i, prev + i, stride, stride, 4);

  509.                         continue;

  510.                     }

  511.                     code = bytestream2_get_byte(&ctx->gb);

  512.                     if (code == 0xFF) {

  513.                         if (bytestream2_get_bytes_left(&ctx->gb) < 16)

  514.                             return AVERROR_INVALIDDATA;

  515.                         for (k = 0; k < 4; k++)

  516.                             bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);

  517.                     } else if (compr == 4 && !code) {

  518.                         if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  519.                             return AVERROR_INVALIDDATA;

  520.                         skip_run = bytestream2_get_byteu(&ctx->gb) + 1;

  521.                         i -= 4;

  522.                     } else {

  523.                         int mx, my;

  524. 

  525.                         mx = c37_mv[(mvoff * 255 + code) * 2];

  526.                         my = c37_mv[(mvoff * 255 + code) * 2 + 1];

  527.                         codec37_mv(dst + i, prev + i + mx + my * stride,

  528.                                    ctx->height, stride, i + mx, j + my);

  529.                     }

  530.                 }

  531.                 dst  += stride * 4;

  532.                 prev += stride * 4;

  533.             }

  534.         }

  535.         break;

  536.     default:

  537.         av_log(ctx->avctx, AV_LOG_ERROR,

  538.                "subcodec 37 compression %d not implemented\n", compr);

  539.         return AVERROR_PATCHWELCOME;

  540.     }

  541. 

  542.     return 0;

  543. }

  544. 

  545. static int process_block(SANMVideoContext *ctx, uint8_t *dst, uint8_t *prev1,

  546.                          uint8_t *prev2, int stride, int tbl, int size)

  547. {

  548.     int code, k, t;

  549.     uint8_t colors[2];

  550.     int8_t *pglyph;

  551. 

  552.     if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  553.         return AVERROR_INVALIDDATA;

  554. 

  555.     code = bytestream2_get_byteu(&ctx->gb);

  556.     if (code >= 0xF8) {

  557.         switch (code) {

  558.         case 0xFF:

  559.             if (size == 2) {

  560.                 if (bytestream2_get_bytes_left(&ctx->gb) < 4)

  561.                     return AVERROR_INVALIDDATA;

  562.                 dst[0]        = bytestream2_get_byteu(&ctx->gb);

  563.                 dst[1]        = bytestream2_get_byteu(&ctx->gb);

  564.                 dst[0+stride] = bytestream2_get_byteu(&ctx->gb);

  565.                 dst[1+stride] = bytestream2_get_byteu(&ctx->gb);

  566.             } else {

  567.                 size >>= 1;

  568.                 if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))

  569.                     return AVERROR_INVALIDDATA;

  570.                 if (process_block(ctx, dst + size, prev1 + size, prev2 + size,

  571.                                   stride, tbl, size))

  572.                     return AVERROR_INVALIDDATA;

  573.                 dst   += size * stride;

  574.                 prev1 += size * stride;

  575.                 prev2 += size * stride;

  576.                 if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))

  577.                     return AVERROR_INVALIDDATA;

  578.                 if (process_block(ctx, dst + size, prev1 + size, prev2 + size,

  579.                                   stride, tbl, size))

  580.                     return AVERROR_INVALIDDATA;

  581.             }

  582.             break;

  583.         case 0xFE:

  584.             if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  585.                 return AVERROR_INVALIDDATA;

  586. 

  587.             t = bytestream2_get_byteu(&ctx->gb);

  588.             for (k = 0; k < size; k++)

  589.                 memset(dst + k * stride, t, size);

  590.             break;

  591.         case 0xFD:

  592.             if (bytestream2_get_bytes_left(&ctx->gb) < 3)

  593.                 return AVERROR_INVALIDDATA;

  594. 

  595.             code = bytestream2_get_byteu(&ctx->gb);

  596.             pglyph = (size == 8) ? ctx->p8x8glyphs[code] : ctx->p4x4glyphs[code];

  597.             bytestream2_get_bufferu(&ctx->gb, colors, 2);

  598. 

  599.             for (k = 0; k < size; k++)

  600.                 for (t = 0; t < size; t++)

  601.                     dst[t + k * stride] = colors[!*pglyph++];

  602.             break;

  603.         case 0xFC:

  604.             for (k = 0; k < size; k++)

  605.                 memcpy(dst + k * stride, prev1 + k * stride, size);

  606.             break;

  607.         default:

  608.             k = bytestream2_tell(&ctx->gb);

  609.             bytestream2_seek(&ctx->gb, tbl + (code & 7), SEEK_SET);

  610.             t = bytestream2_get_byte(&ctx->gb);

  611.             bytestream2_seek(&ctx->gb, k, SEEK_SET);

  612.             for (k = 0; k < size; k++)

  613.                 memset(dst + k * stride, t, size);

  614.         }

  615.     } else {

  616.         int mx = motion_vectors[code][0];

  617.         int my = motion_vectors[code][1];

  618.         int index = prev2 - (const uint8_t*)ctx->frm2;

  619. 

  620.         av_assert2(index >= 0 && index < (ctx->buf_size>>1));

  621. 

  622.         if (index < - mx - my*stride ||

  623.             (ctx->buf_size>>1) - index < mx + size + (my + size - 1)*stride) {

  624.             av_log(ctx->avctx, AV_LOG_ERROR, "MV is invalid \n");

  625.             return AVERROR_INVALIDDATA;

  626.         }

  627. 

  628.         for (k = 0; k < size; k++)

  629.             memcpy(dst + k * stride, prev2 + mx + (my + k) * stride, size);

  630.     }

  631. 

  632.     return 0;

  633. }

  634. 

  635. static int old_codec47(SANMVideoContext *ctx, int top,

  636.                        int left, int width, int height)

  637. {

  638.     int i, j, seq, compr, new_rot, tbl_pos, skip;

  639.     int stride     = ctx->pitch;

  640.     uint8_t *dst   = ((uint8_t*)ctx->frm0) + left + top * stride;

  641.     uint8_t *prev1 = (uint8_t*)ctx->frm1;

  642.     uint8_t *prev2 = (uint8_t*)ctx->frm2;

  643.     uint32_t decoded_size;

  644. 

  645.     tbl_pos = bytestream2_tell(&ctx->gb);

  646.     seq     = bytestream2_get_le16(&ctx->gb);

  647.     compr   = bytestream2_get_byte(&ctx->gb);

  648.     new_rot = bytestream2_get_byte(&ctx->gb);

  649.     skip    = bytestream2_get_byte(&ctx->gb);

  650.     bytestream2_skip(&ctx->gb, 9);

  651.     decoded_size = bytestream2_get_le32(&ctx->gb);

  652.     bytestream2_skip(&ctx->gb, 8);

  653. 

  654.     if (decoded_size > ctx->height * stride - left - top * stride) {

  655.         decoded_size = ctx->height * stride - left - top * stride;

  656.         av_log(ctx->avctx, AV_LOG_WARNING, "decoded size is too large\n");

  657.     }

  658. 

  659.     if (skip & 1)

  660.         bytestream2_skip(&ctx->gb, 0x8080);

  661.     if (!seq) {

  662.         ctx->prev_seq = -1;

  663.         memset(prev1, 0, ctx->height * stride);

  664.         memset(prev2, 0, ctx->height * stride);

  665.     }

  666.     av_dlog(ctx->avctx, "compression %d\n", compr);

  667.     switch (compr) {

  668.     case 0:

  669.         if (bytestream2_get_bytes_left(&ctx->gb) < width * height)

  670.             return AVERROR_INVALIDDATA;

  671.         for (j = 0; j < height; j++) {

  672.             bytestream2_get_bufferu(&ctx->gb, dst, width);

  673.             dst += stride;

  674.         }

  675.         break;

  676.     case 1:

  677.         if (bytestream2_get_bytes_left(&ctx->gb) < ((width + 1) >> 1) * ((height + 1) >> 1))

  678.             return AVERROR_INVALIDDATA;

  679.         for (j = 0; j < height; j += 2) {

  680.             for (i = 0; i < width; i += 2) {

  681.                 dst[i] = dst[i + 1] =

  682.                 dst[stride + i] = dst[stride + i + 1] = bytestream2_get_byteu(&ctx->gb);

  683.             }

  684.             dst += stride * 2;

  685.         }

  686.         break;

  687.     case 2:

  688.         if (seq == ctx->prev_seq + 1) {

  689.             for (j = 0; j < height; j += 8) {

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

  691.                     if (process_block(ctx, dst + i, prev1 + i, prev2 + i, stride,

  692.                                       tbl_pos + 8, 8))

  693.                         return AVERROR_INVALIDDATA;

  694.                 }

  695.                 dst   += stride * 8;

  696.                 prev1 += stride * 8;

  697.                 prev2 += stride * 8;

  698.             }

  699.         }

  700.         break;

  701.     case 3:

  702.         memcpy(ctx->frm0, ctx->frm2, ctx->pitch * ctx->height);

  703.         break;

  704.     case 4:

  705.         memcpy(ctx->frm0, ctx->frm1, ctx->pitch * ctx->height);

  706.         break;

  707.     case 5:

  708.         if (rle_decode(ctx, dst, decoded_size))

  709.             return AVERROR_INVALIDDATA;

  710.         break;

  711.     default:

  712.         av_log(ctx->avctx, AV_LOG_ERROR,

  713.                "subcodec 47 compression %d not implemented\n", compr);

  714.         return AVERROR_PATCHWELCOME;

  715.     }

  716.     if (seq == ctx->prev_seq + 1)

  717.         ctx->rotate_code = new_rot;

  718.     else

  719.         ctx->rotate_code = 0;

  720.     ctx->prev_seq = seq;

  721. 

  722.     return 0;

  723. }

  724. 

  725. static int process_frame_obj(SANMVideoContext *ctx)

  726. {

  727.     uint16_t codec, top, left, w, h;

  728. 

  729.     codec = bytestream2_get_le16u(&ctx->gb);

  730.     left  = bytestream2_get_le16u(&ctx->gb);

  731.     top   = bytestream2_get_le16u(&ctx->gb);

  732.     w     = bytestream2_get_le16u(&ctx->gb);

  733.     h     = bytestream2_get_le16u(&ctx->gb);

  734. 

  735.     if (ctx->width < left + w || ctx->height < top + h) {

  736.         if (av_image_check_size(FFMAX(left + w, ctx->width),

  737.                                 FFMAX(top  + h, ctx->height), 0, ctx->avctx) < 0)

  738.             return AVERROR_INVALIDDATA;

  739.         avcodec_set_dimensions(ctx->avctx, FFMAX(left + w, ctx->width),

  740.                                            FFMAX(top  + h, ctx->height));

  741.         init_sizes(ctx, FFMAX(left + w, ctx->width),

  742.                         FFMAX(top  + h, ctx->height));

  743.         if (init_buffers(ctx)) {

  744.             av_log(ctx->avctx, AV_LOG_ERROR, "error resizing buffers\n");

  745.             return AVERROR(ENOMEM);

  746.         }

  747.     }

  748.     bytestream2_skip(&ctx->gb, 4);

  749. 

  750.     av_dlog(ctx->avctx, "subcodec %d\n", codec);

  751.     switch (codec) {

  752.     case 1:

  753.     case 3:

  754.         return old_codec1(ctx, top, left, w, h);

  755.         break;

  756.     case 37:

  757.         return old_codec37(ctx, top, left, w, h);

  758.         break;

  759.     case 47:

  760.         return old_codec47(ctx, top, left, w, h);

  761.         break;

  762.     default:

  763.         avpriv_request_sample(ctx->avctx, "unknown subcodec %d", codec);

  764.         return AVERROR_PATCHWELCOME;

  765.     }

  766. }

  767. 

  768. static int decode_0(SANMVideoContext *ctx)

  769. {

  770.     uint16_t *frm = ctx->frm0;

  771.     int x, y;

  772. 

  773.     if (bytestream2_get_bytes_left(&ctx->gb) < ctx->width * ctx->height * 2) {

  774.         av_log(ctx->avctx, AV_LOG_ERROR, "insufficient data for raw frame\n");

  775.         return AVERROR_INVALIDDATA;

  776.     }

  777.     for (y = 0; y < ctx->height; y++) {

  778.         for (x = 0; x < ctx->width; x++)

  779.             frm[x] = bytestream2_get_le16u(&ctx->gb);

  780.         frm += ctx->pitch;

  781.     }

  782.     return 0;

  783. }

  784. 

  785. static int decode_nop(SANMVideoContext *ctx)

  786. {

  787.     avpriv_request_sample(ctx->avctx, "unknown/unsupported compression type");

  788.     return AVERROR_PATCHWELCOME;

  789. }

  790. 

  791. static void copy_block(uint16_t *pdest, uint16_t *psrc, int block_size, int pitch)

  792. {

  793.     uint8_t *dst = (uint8_t *)pdest;

  794.     uint8_t *src = (uint8_t *)psrc;

  795.     int stride = pitch * 2;

  796. 

  797.     switch (block_size) {

  798.     case 2:

  799.         copy_block4(dst, src, stride, stride, 2);

  800.         break;

  801.     case 4:

  802.         copy_block8(dst, src, stride, stride, 4);

  803.         break;

  804.     case 8:

  805.         copy_block16(dst, src, stride, stride, 8);

  806.         break;

  807.     }

  808. }

  809. 

  810. static void fill_block(uint16_t *pdest, uint16_t color, int block_size, int pitch)

  811. {

  812.     int x, y;

  813. 

  814.     pitch -= block_size;

  815.     for (y = 0; y < block_size; y++, pdest += pitch)

  816.         for (x = 0; x < block_size; x++)

  817.             *pdest++ = color;

  818. }

  819. 

  820. static int draw_glyph(SANMVideoContext *ctx, uint16_t *dst, int index, uint16_t fg_color,

  821.                       uint16_t bg_color, int block_size, int pitch)

  822. {

  823.     int8_t *pglyph;

  824.     uint16_t colors[2] = { fg_color, bg_color };

  825.     int x, y;

  826. 

  827.     if (index >= NGLYPHS) {

  828.         av_log(ctx->avctx, AV_LOG_ERROR, "ignoring nonexistent glyph #%u\n", index);

  829.         return AVERROR_INVALIDDATA;

  830.     }

  831. 

  832.     pglyph = block_size == 8 ? ctx->p8x8glyphs[index] : ctx->p4x4glyphs[index];

  833.     pitch -= block_size;

  834. 

  835.     for (y = 0; y < block_size; y++, dst += pitch)

  836.         for (x = 0; x < block_size; x++)

  837.             *dst++ = colors[*pglyph++];

  838.     return 0;

  839. }

  840. 

  841. static int opcode_0xf7(SANMVideoContext *ctx, int cx, int cy, int block_size, int pitch)

  842. {

  843.     uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;

  844. 

  845.     if (block_size == 2) {

  846.         uint32_t indices;

  847. 

  848.         if (bytestream2_get_bytes_left(&ctx->gb) < 4)

  849.             return AVERROR_INVALIDDATA;

  850. 

  851.         indices        = bytestream2_get_le32u(&ctx->gb);

  852.         dst[0]         = ctx->codebook[indices & 0xFF]; indices >>= 8;

  853.         dst[1]         = ctx->codebook[indices & 0xFF]; indices >>= 8;

  854.         dst[pitch]     = ctx->codebook[indices & 0xFF]; indices >>= 8;

  855.         dst[pitch + 1] = ctx->codebook[indices & 0xFF];

  856.     } else {

  857.         uint16_t fgcolor, bgcolor;

  858.         int glyph;

  859. 

  860.         if (bytestream2_get_bytes_left(&ctx->gb) < 3)

  861.             return AVERROR_INVALIDDATA;

  862. 

  863.         glyph   = bytestream2_get_byteu(&ctx->gb);

  864.         bgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  865.         fgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  866. 

  867.         draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);

  868.     }

  869.     return 0;

  870. }

  871. 

  872. static int opcode_0xf8(SANMVideoContext *ctx, int cx, int cy, int block_size, int pitch)

  873. {

  874.     uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;

  875. 

  876.     if (block_size == 2) {

  877.         if (bytestream2_get_bytes_left(&ctx->gb) < 8)

  878.             return AVERROR_INVALIDDATA;

  879. 

  880.         dst[0]         = bytestream2_get_le16u(&ctx->gb);

  881.         dst[1]         = bytestream2_get_le16u(&ctx->gb);

  882.         dst[pitch]     = bytestream2_get_le16u(&ctx->gb);

  883.         dst[pitch + 1] = bytestream2_get_le16u(&ctx->gb);

  884.     } else {

  885.         uint16_t fgcolor, bgcolor;

  886.         int glyph;

  887. 

  888.         if (bytestream2_get_bytes_left(&ctx->gb) < 5)

  889.             return AVERROR_INVALIDDATA;

  890. 

  891.         glyph   = bytestream2_get_byteu(&ctx->gb);

  892.         bgcolor = bytestream2_get_le16u(&ctx->gb);

  893.         fgcolor = bytestream2_get_le16u(&ctx->gb);

  894. 

  895.         draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);

  896.     }

  897.     return 0;

  898. }

  899. 

  900. static int good_mvec(SANMVideoContext *ctx, int cx, int cy, int mx, int my,

  901.                      int block_size)

  902. {

  903.     int start_pos = cx + mx + (cy + my) * ctx->pitch;

  904.     int end_pos = start_pos + (block_size - 1) * (ctx->pitch + 1);

  905. 

  906.     int good = start_pos >= 0 && end_pos < (ctx->buf_size >> 1);

  907. 

  908.     if (!good) {

  909.         av_log(ctx->avctx, AV_LOG_ERROR, "ignoring invalid motion vector (%i, %i)->(%u, %u), block size = %u\n",

  910.                cx + mx, cy + my, cx, cy, block_size);

  911.     }

  912. 

  913.     return good;

  914. }

  915. 

  916. static int codec2subblock(SANMVideoContext *ctx, int cx, int cy, int blk_size)

  917. {

  918.     int16_t mx, my, index;

  919.     int opcode;

  920. 

  921.     if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  922.         return AVERROR_INVALIDDATA;

  923. 

  924.     opcode = bytestream2_get_byteu(&ctx->gb);

  925. 

  926.     av_dlog(ctx->avctx, "opcode 0x%0X cx %d cy %d blk %d\n", opcode, cx, cy, blk_size);

  927.     switch (opcode) {

  928.     default:

  929.         mx = motion_vectors[opcode][0];

  930.         my = motion_vectors[opcode][1];

  931. 

  932.         if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {

  933.             copy_block(ctx->frm0 + cx      + ctx->pitch *  cy,

  934.                        ctx->frm2 + cx + mx + ctx->pitch * (cy + my),

  935.                        blk_size, ctx->pitch);

  936.         }

  937.         break;

  938.     case 0xF5:

  939.         if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  940.             return AVERROR_INVALIDDATA;

  941.         index = bytestream2_get_le16u(&ctx->gb);

  942. 

  943.         mx = index % ctx->width;

  944.         my = index / ctx->width;

  945. 

  946.         if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {

  947.             copy_block(ctx->frm0 + cx      + ctx->pitch *  cy,

  948.                        ctx->frm2 + cx + mx + ctx->pitch * (cy + my),

  949.                        blk_size, ctx->pitch);

  950.         }

  951.         break;

  952.     case 0xF6:

  953.         copy_block(ctx->frm0 + cx + ctx->pitch * cy,

  954.                    ctx->frm1 + cx + ctx->pitch * cy,

  955.                    blk_size, ctx->pitch);

  956.         break;

  957.     case 0xF7:

  958.         opcode_0xf7(ctx, cx, cy, blk_size, ctx->pitch);

  959.         break;

  960. 

  961.     case 0xF8:

  962.         opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);

  963.         break;

  964.     case 0xF9:

  965.     case 0xFA:

  966.     case 0xFB:

  967.     case 0xFC:

  968.         fill_block(ctx->frm0 + cx + cy * ctx->pitch,

  969.                    ctx->small_codebook[opcode - 0xf9], blk_size, ctx->pitch);

  970.         break;

  971.     case 0xFD:

  972.         if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  973.             return AVERROR_INVALIDDATA;

  974.         fill_block(ctx->frm0 + cx + cy * ctx->pitch,

  975.                    ctx->codebook[bytestream2_get_byteu(&ctx->gb)], blk_size, ctx->pitch);

  976.         break;

  977.     case 0xFE:

  978.         if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  979.             return AVERROR_INVALIDDATA;

  980.         fill_block(ctx->frm0 + cx + cy * ctx->pitch,

  981.                    bytestream2_get_le16u(&ctx->gb), blk_size, ctx->pitch);

  982.         break;

  983.     case 0xFF:

  984.         if (blk_size == 2) {

  985.             opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);

  986.         } else {

  987.             blk_size >>= 1;

  988.             if (codec2subblock(ctx, cx           , cy           , blk_size))

  989.                 return AVERROR_INVALIDDATA;

  990.             if (codec2subblock(ctx, cx + blk_size, cy           , blk_size))

  991.                 return AVERROR_INVALIDDATA;

  992.             if (codec2subblock(ctx, cx           , cy + blk_size, blk_size))

  993.                 return AVERROR_INVALIDDATA;

  994.             if (codec2subblock(ctx, cx + blk_size, cy + blk_size, blk_size))

  995.                 return AVERROR_INVALIDDATA;

  996.         }

  997.         break;

  998.     }

  999.     return 0;

  1000. }

  1001. 

  1002. static int decode_2(SANMVideoContext *ctx)

  1003. {

  1004.     int cx, cy, ret;

  1005. 

  1006.     for (cy = 0; cy < ctx->aligned_height; cy += 8) {

  1007.         for (cx = 0; cx < ctx->aligned_width; cx += 8) {

  1008.             if (ret = codec2subblock(ctx, cx, cy, 8))

  1009.                 return ret;

  1010.         }

  1011.     }

  1012. 

  1013.     return 0;

  1014. }

  1015. 

  1016. static int decode_3(SANMVideoContext *ctx)

  1017. {

  1018.     memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);

  1019.     return 0;

  1020. }

  1021. 

  1022. static int decode_4(SANMVideoContext *ctx)

  1023. {

  1024.     memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);

  1025.     return 0;

  1026. }

  1027. 

  1028. static int decode_5(SANMVideoContext *ctx)

  1029. {

  1030. #if HAVE_BIGENDIAN

  1031.     uint16_t *frm;

  1032.     int npixels;

  1033. #endif

  1034.     uint8_t *dst = (uint8_t*)ctx->frm0;

  1035. 

  1036.     if (rle_decode(ctx, dst, ctx->buf_size))

  1037.         return AVERROR_INVALIDDATA;

  1038. 

  1039. #if HAVE_BIGENDIAN

  1040.     npixels = ctx->npixels;

  1041.     frm = ctx->frm0;

  1042.     while (npixels--)

  1043.         *frm++ = av_bswap16(*frm);

  1044. #endif

  1045. 

  1046.     return 0;

  1047. }

  1048. 

  1049. static int decode_6(SANMVideoContext *ctx)

  1050. {

  1051.     int npixels = ctx->npixels;

  1052.     uint16_t *frm = ctx->frm0;

  1053. 

  1054.     if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {

  1055.         av_log(ctx->avctx, AV_LOG_ERROR, "insufficient data for frame\n");

  1056.         return AVERROR_INVALIDDATA;

  1057.     }

  1058.     while (npixels--)

  1059.         *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1060. 

  1061.     return 0;

  1062. }

  1063. 

  1064. static int decode_8(SANMVideoContext *ctx)

  1065. {

  1066.     uint16_t *pdest = ctx->frm0;

  1067.     uint8_t *rsrc;

  1068.     long npixels = ctx->npixels;

  1069. 

  1070.     av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);

  1071.     if (!ctx->rle_buf) {

  1072.         av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed\n");

  1073.         return AVERROR(ENOMEM);

  1074.     }

  1075.     rsrc = ctx->rle_buf;

  1076. 

  1077.     if (rle_decode(ctx, rsrc, npixels))

  1078.         return AVERROR_INVALIDDATA;

  1079. 

  1080.     while (npixels--)

  1081.         *pdest++ = ctx->codebook[*rsrc++];

  1082. 

  1083.     return 0;

  1084. }

  1085. 

  1086. typedef int (*frm_decoder)(SANMVideoContext *ctx);

  1087. 

  1088. static const frm_decoder v1_decoders[] = {

  1089.     decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,

  1090.     decode_6, decode_nop, decode_8

  1091. };

  1092. 

  1093. static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1094. {

  1095.     int i, ret;

  1096. 

  1097.     if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {

  1098.         av_log(ctx->avctx, AV_LOG_ERROR, "too short input frame (%d bytes)\n",

  1099.                ret);

  1100.         return AVERROR_INVALIDDATA;

  1101.     }

  1102.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1103. 

  1104.     hdr->width  = bytestream2_get_le32u(&ctx->gb);

  1105.     hdr->height = bytestream2_get_le32u(&ctx->gb);

  1106. 

  1107.     if (hdr->width != ctx->width || hdr->height != ctx->height) {

  1108.         av_log(ctx->avctx, AV_LOG_ERROR, "variable size frames are not implemented\n");

  1109.         return AVERROR_PATCHWELCOME;

  1110.     }

  1111. 

  1112.     hdr->seq_num     = bytestream2_get_le16u(&ctx->gb);

  1113.     hdr->codec       = bytestream2_get_byteu(&ctx->gb);

  1114.     hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);

  1115. 

  1116.     bytestream2_skip(&ctx->gb, 4); // skip pad

  1117. 

  1118.     for (i = 0; i < 4; i++)

  1119.         ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1120.     hdr->bg_color = bytestream2_get_le16u(&ctx->gb);

  1121. 

  1122.     bytestream2_skip(&ctx->gb, 2); // skip pad

  1123. 

  1124.     hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);

  1125.     for (i = 0; i < 256; i++)

  1126.         ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1127. 

  1128.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1129. 

  1130.     av_dlog(ctx->avctx, "subcodec %d\n", hdr->codec);

  1131.     return 0;

  1132. }

  1133. 

  1134. static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)

  1135. {

  1136.     while (buf_size--)

  1137.         *pbuf++ = color;

  1138. }

  1139. 

  1140. static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1141. {

  1142.     uint8_t *dst;

  1143.     const uint8_t *src = (uint8_t*) ctx->frm0;

  1144.     int ret, dstpitch, height = ctx->height;

  1145.     int srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);

  1146. 

  1147.     if ((ret = ff_get_buffer(ctx->avctx, ctx->frame, 0)) < 0)

  1148.         return ret;

  1149. 

  1150.     dst      = ctx->frame->data[0];

  1151.     dstpitch = ctx->frame->linesize[0];

  1152. 

  1153.     while (height--) {

  1154.         memcpy(dst, src, srcpitch);

  1155.         src += srcpitch;

  1156.         dst += dstpitch;

  1157.     }

  1158. 

  1159.     return 0;

  1160. }

  1161. 

  1162. static int decode_frame(AVCodecContext *avctx, void *data,

  1163.                         int *got_frame_ptr, AVPacket *pkt)

  1164. {

  1165.     SANMVideoContext *ctx = avctx->priv_data;

  1166.     int i, ret;

  1167. 

  1168.     ctx->frame = data;

  1169.     bytestream2_init(&ctx->gb, pkt->data, pkt->size);

  1170. 

  1171.     if (!ctx->version) {

  1172.         int to_store = 0;

  1173. 

  1174.         while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {

  1175.             uint32_t sig, size;

  1176.             int pos;

  1177. 

  1178.             sig  = bytestream2_get_be32u(&ctx->gb);

  1179.             size = bytestream2_get_be32u(&ctx->gb);

  1180.             pos  = bytestream2_tell(&ctx->gb);

  1181. 

  1182.             if (bytestream2_get_bytes_left(&ctx->gb) < size) {

  1183.                 av_log(avctx, AV_LOG_ERROR, "incorrect chunk size %d\n", size);

  1184.                 break;

  1185.             }

  1186.             switch (sig) {

  1187.             case MKBETAG('N', 'P', 'A', 'L'):

  1188.                 if (size != 256 * 3) {

  1189.                     av_log(avctx, AV_LOG_ERROR, "incorrect palette block size %d\n",

  1190.                            size);

  1191.                     return AVERROR_INVALIDDATA;

  1192.                 }

  1193.                 for (i = 0; i < 256; i++)

  1194.                     ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1195.                 break;

  1196.             case MKBETAG('F', 'O', 'B', 'J'):

  1197.                 if (size < 16)

  1198.                     return AVERROR_INVALIDDATA;

  1199.                 if (ret = process_frame_obj(ctx))

  1200.                     return ret;

  1201.                 break;

  1202.             case MKBETAG('X', 'P', 'A', 'L'):

  1203.                 if (size == 6 || size == 4) {

  1204.                     uint8_t tmp[3];

  1205.                     int j;

  1206. 

  1207.                     for (i = 0; i < 256; i++) {

  1208.                         for (j = 0; j < 3; j++) {

  1209.                             int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;

  1210.                             tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);

  1211.                         }

  1212.                         ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);

  1213.                     }

  1214.                 } else {

  1215.                     if (size < 768 * 2 + 4) {

  1216.                         av_log(avctx, AV_LOG_ERROR, "incorrect palette change block size %d\n",

  1217.                                size);

  1218.                         return AVERROR_INVALIDDATA;

  1219.                     }

  1220.                     bytestream2_skipu(&ctx->gb, 4);

  1221.                     for (i = 0; i < 768; i++)

  1222.                         ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);

  1223.                     if (size >= 768 * 5 + 4) {

  1224.                         for (i = 0; i < 256; i++)

  1225.                             ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1226.                     } else {

  1227.                         memset(ctx->pal, 0, sizeof(ctx->pal));

  1228.                     }

  1229.                 }

  1230.                 break;

  1231.             case MKBETAG('S', 'T', 'O', 'R'):

  1232.                 to_store = 1;

  1233.                 break;

  1234.             case MKBETAG('F', 'T', 'C', 'H'):

  1235.                 memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);

  1236.                 break;

  1237.             default:

  1238.                 bytestream2_skip(&ctx->gb, size);

  1239.                 av_log(avctx, AV_LOG_DEBUG, "unknown/unsupported chunk %x\n", sig);

  1240.                 break;

  1241.             }

  1242. 

  1243.             bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);

  1244.             if (size & 1)

  1245.                 bytestream2_skip(&ctx->gb, 1);

  1246.         }

  1247.         if (to_store)

  1248.             memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);

  1249.         if ((ret = copy_output(ctx, NULL)))

  1250.             return ret;

  1251.         memcpy(ctx->frame->data[1], ctx->pal, 1024);

  1252.     } else {

  1253.         SANMFrameHeader header;

  1254. 

  1255.         if ((ret = read_frame_header(ctx, &header)))

  1256.             return ret;

  1257. 

  1258.         ctx->rotate_code = header.rotate_code;

  1259.         if ((ctx->frame->key_frame = !header.seq_num)) {

  1260.             ctx->frame->pict_type = AV_PICTURE_TYPE_I;

  1261.             fill_frame(ctx->frm1, ctx->npixels, header.bg_color);

  1262.             fill_frame(ctx->frm2, ctx->npixels, header.bg_color);

  1263.         } else {

  1264.             ctx->frame->pict_type = AV_PICTURE_TYPE_P;

  1265.         }

  1266. 

  1267.         if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {

  1268.             if ((ret = v1_decoders[header.codec](ctx))) {

  1269.                 av_log(avctx, AV_LOG_ERROR,

  1270.                        "subcodec %d: error decoding frame\n", header.codec);

  1271.                 return ret;

  1272.             }

  1273.         } else {

  1274.             avpriv_request_sample(avctx, "subcodec %d",

  1275.                    header.codec);

  1276.             return AVERROR_PATCHWELCOME;

  1277.         }

  1278. 

  1279.         if ((ret = copy_output(ctx, &header)))

  1280.             return ret;

  1281.     }

  1282.     if (ctx->rotate_code)

  1283.         rotate_bufs(ctx, ctx->rotate_code);

  1284. 

  1285.     *got_frame_ptr  = 1;

  1286. 

  1287.     return pkt->size;

  1288. }

  1289. 

  1290. AVCodec ff_sanm_decoder = {

  1291.     .name           = "sanm",

  1292.     .type           = AVMEDIA_TYPE_VIDEO,

  1293.     .id             = AV_CODEC_ID_SANM,

  1294.     .priv_data_size = sizeof(SANMVideoContext),

  1295.     .init           = decode_init,

  1296.     .close          = decode_end,

  1297.     .decode         = decode_frame,

  1298.     .capabilities   = CODEC_CAP_DR1,

  1299.     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts SMUSH video"),

  1300. };