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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, *output;

  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.     ctx->output          = &ctx->frame;

  278.     ctx->output->data[0] = 0;

  279. 

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

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

  282. 

  283.     if (!ctx->version) {

  284.         int i;

  285. 

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

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

  288.             return AVERROR_INVALIDDATA;

  289.         }

  290. 

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

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

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

  294.     }

  295. 

  296.     return 0;

  297. }

  298. 

  299. static av_cold int decode_end(AVCodecContext *avctx)

  300. {

  301.     SANMVideoContext *ctx = avctx->priv_data;

  302. 

  303.     destroy_buffers(ctx);

  304. 

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

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

  307.         ctx->frame.data[0] = 0;

  308.     }

  309. 

  310.     return 0;

  311. }

  312. 

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

  314. {

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

  316. 

  317.     while (left > 0) {

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

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

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

  321.             return AVERROR_INVALIDDATA;

  322. 

  323.         if (opcode & 1) {

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

  325.             memset(dst, color, run_len);

  326.         } else {

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

  328.                 return AVERROR_INVALIDDATA;

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

  330.         }

  331. 

  332.         dst  += run_len;

  333.         left -= run_len;

  334.     }

  335. 

  336.     return 0;

  337. }

  338. 

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

  340.                       int left, int width, int height)

  341. {

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

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

  344. 

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

  346.         pos = 0;

  347. 

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

  349.             return AVERROR_INVALIDDATA;

  350. 

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

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

  353. 

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

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

  356.                 return AVERROR_INVALIDDATA;

  357. 

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

  359.             flag = code & 1;

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

  361.             if (pos + code > width)

  362.                 return AVERROR_INVALIDDATA;

  363.             if (flag) {

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

  365.                 if (val)

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

  367.                 pos += code;

  368.             } else {

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

  370.                     return AVERROR_INVALIDDATA;

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

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

  373.                     if (val)

  374.                         dst[pos] = val;

  375.                     pos++;

  376.                 }

  377.             }

  378.         }

  379.         dst += ctx->pitch;

  380.     }

  381.     ctx->rotate_code = 0;

  382. 

  383.     return 0;

  384. }

  385. 

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

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

  388. {

  389.     int pos, i, j;

  390. 

  391.     pos = x + y * stride;

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

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

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

  395.                 dst[i] = 0;

  396.             else

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

  398.         }

  399.         dst += stride;

  400.         src += stride;

  401.         pos += stride;

  402.     }

  403. }

  404. 

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

  406.                        int left, int width, int height)

  407. {

  408.     int stride = ctx->pitch;

  409.     int i, j, k, t;

  410.     int skip_run = 0;

  411.     int compr, mvoff, seq, flags;

  412.     uint32_t decoded_size;

  413.     uint8_t *dst, *prev;

  414. 

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

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

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

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

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

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

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

  422. 

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

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

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

  426.     }

  427. 

  428.     ctx->rotate_code = 0;

  429. 

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

  431.         rotate_bufs(ctx, 1);

  432. 

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

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

  435. 

  436.     if (mvoff > 2) {

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

  438.         return AVERROR_INVALIDDATA;

  439.     }

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

  441.     switch (compr) {

  442.     case 0:

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

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

  445.             dst += stride;

  446.         }

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

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

  449.         break;

  450.     case 2:

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

  452.             return AVERROR_INVALIDDATA;

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

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

  455.         break;

  456.     case 3:

  457.     case 4:

  458.         if (flags & 4) {

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

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

  461.                     int code;

  462.                     if (skip_run) {

  463.                         skip_run--;

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

  465.                         continue;

  466.                     }

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

  468.                         return AVERROR_INVALIDDATA;

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

  470.                     switch (code) {

  471.                     case 0xFF:

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

  473.                             return AVERROR_INVALIDDATA;

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

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

  476.                         break;

  477.                     case 0xFE:

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

  479.                             return AVERROR_INVALIDDATA;

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

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

  482.                         break;

  483.                     case 0xFD:

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

  485.                             return AVERROR_INVALIDDATA;

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

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

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

  489.                         break;

  490.                     default:

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

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

  493.                                 return AVERROR_INVALIDDATA;

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

  495.                             i -= 4;

  496.                         } else {

  497.                             int mx, my;

  498. 

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

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

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

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

  503.                         }

  504.                     }

  505.                 }

  506.                 dst  += stride * 4;

  507.                 prev += stride * 4;

  508.             }

  509.         } else {

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

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

  512.                     int code;

  513.                     if (skip_run) {

  514.                         skip_run--;

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

  516.                         continue;

  517.                     }

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

  519.                     if (code == 0xFF) {

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

  521.                             return AVERROR_INVALIDDATA;

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

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

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

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

  526.                             return AVERROR_INVALIDDATA;

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

  528.                         i -= 4;

  529.                     } else {

  530.                         int mx, my;

  531. 

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

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

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

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

  536.                     }

  537.                 }

  538.                 dst  += stride * 4;

  539.                 prev += stride * 4;

  540.             }

  541.         }

  542.         break;

  543.     default:

  544.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  546.         return AVERROR_PATCHWELCOME;

  547.     }

  548. 

  549.     return 0;

  550. }

  551. 

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

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

  554. {

  555.     int code, k, t;

  556.     uint8_t colors[2];

  557.     int8_t *pglyph;

  558. 

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

  560.         return AVERROR_INVALIDDATA;

  561. 

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

  563.     if (code >= 0xF8) {

  564.         switch (code) {

  565.         case 0xFF:

  566.             if (size == 2) {

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

  568.                     return AVERROR_INVALIDDATA;

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

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

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

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

  573.             } else {

  574.                 size >>= 1;

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

  576.                     return AVERROR_INVALIDDATA;

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

  578.                                   stride, tbl, size))

  579.                     return AVERROR_INVALIDDATA;

  580.                 dst   += size * stride;

  581.                 prev1 += size * stride;

  582.                 prev2 += size * stride;

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

  584.                     return AVERROR_INVALIDDATA;

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

  586.                                   stride, tbl, size))

  587.                     return AVERROR_INVALIDDATA;

  588.             }

  589.             break;

  590.         case 0xFE:

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

  592.                 return AVERROR_INVALIDDATA;

  593. 

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

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

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

  597.             break;

  598.         case 0xFD:

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

  600.                 return AVERROR_INVALIDDATA;

  601. 

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

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

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

  605. 

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

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

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

  609.             break;

  610.         case 0xFC:

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

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

  613.             break;

  614.         default:

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

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

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

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

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

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

  621.         }

  622.     } else {

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

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

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

  626. 

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

  628. 

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

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

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

  632.             return AVERROR_INVALIDDATA;

  633.         }

  634. 

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

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

  637.     }

  638. 

  639.     return 0;

  640. }

  641. 

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

  643.                        int left, int width, int height)

  644. {

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

  646.     int stride     = ctx->pitch;

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

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

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

  650.     uint32_t decoded_size;

  651. 

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

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

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

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

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

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

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

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

  660. 

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

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

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

  664.     }

  665. 

  666.     if (skip & 1)

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

  668.     if (!seq) {

  669.         ctx->prev_seq = -1;

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

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

  672.     }

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

  674.     switch (compr) {

  675.     case 0:

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

  677.             return AVERROR_INVALIDDATA;

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

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

  680.             dst += stride;

  681.         }

  682.         break;

  683.     case 1:

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

  685.             return AVERROR_INVALIDDATA;

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

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

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

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

  690.             }

  691.             dst += stride * 2;

  692.         }

  693.         break;

  694.     case 2:

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

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

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

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

  699.                                       tbl_pos + 8, 8))

  700.                         return AVERROR_INVALIDDATA;

  701.                 }

  702.                 dst   += stride * 8;

  703.                 prev1 += stride * 8;

  704.                 prev2 += stride * 8;

  705.             }

  706.         }

  707.         break;

  708.     case 3:

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

  710.         break;

  711.     case 4:

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

  713.         break;

  714.     case 5:

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

  716.             return AVERROR_INVALIDDATA;

  717.         break;

  718.     default:

  719.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  721.         return AVERROR_PATCHWELCOME;

  722.     }

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

  724.         ctx->rotate_code = new_rot;

  725.     else

  726.         ctx->rotate_code = 0;

  727.     ctx->prev_seq = seq;

  728. 

  729.     return 0;

  730. }

  731. 

  732. static int process_frame_obj(SANMVideoContext *ctx)

  733. {

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

  735. 

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

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

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

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

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

  741. 

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

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

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

  745.             return AVERROR_INVALIDDATA;

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

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

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

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

  750.         if (init_buffers(ctx)) {

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

  752.             return AVERROR(ENOMEM);

  753.         }

  754.     }

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

  756. 

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

  758.     switch (codec) {

  759.     case 1:

  760.     case 3:

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

  762.         break;

  763.     case 37:

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

  765.         break;

  766.     case 47:

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

  768.         break;

  769.     default:

  770.         av_log_ask_for_sample(ctx->avctx, "unknown subcodec %d\n", codec);

  771.         return AVERROR_PATCHWELCOME;

  772.     }

  773. }

  774. 

  775. static int decode_0(SANMVideoContext *ctx)

  776. {

  777.     uint16_t *frm = ctx->frm0;

  778.     int x, y;

  779. 

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

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

  782.         return AVERROR_INVALIDDATA;

  783.     }

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

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

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

  787.         frm += ctx->pitch;

  788.     }

  789.     return 0;

  790. }

  791. 

  792. static int decode_nop(SANMVideoContext *ctx)

  793. {

  794.     av_log_ask_for_sample(ctx->avctx, "unknown/unsupported compression type\n");

  795.     return AVERROR_PATCHWELCOME;

  796. }

  797. 

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

  799. {

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

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

  802.     int stride = pitch * 2;

  803. 

  804.     switch (block_size) {

  805.     case 2:

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

  807.         break;

  808.     case 4:

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

  810.         break;

  811.     case 8:

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

  813.         break;

  814.     }

  815. }

  816. 

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

  818. {

  819.     int x, y;

  820. 

  821.     pitch -= block_size;

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

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

  824.             *pdest++ = color;

  825. }

  826. 

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

  828.                       uint16_t bg_color, int block_size, int pitch)

  829. {

  830.     int8_t *pglyph;

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

  832.     int x, y;

  833. 

  834.     if (index >= NGLYPHS) {

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

  836.         return AVERROR_INVALIDDATA;

  837.     }

  838. 

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

  840.     pitch -= block_size;

  841. 

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

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

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

  845.     return 0;

  846. }

  847. 

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

  849. {

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

  851. 

  852.     if (block_size == 2) {

  853.         uint32_t indices;

  854. 

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

  856.             return AVERROR_INVALIDDATA;

  857. 

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

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

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

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

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

  863.     } else {

  864.         uint16_t fgcolor, bgcolor;

  865.         int glyph;

  866. 

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

  868.             return AVERROR_INVALIDDATA;

  869. 

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

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

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

  873. 

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

  875.     }

  876.     return 0;

  877. }

  878. 

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

  880. {

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

  882. 

  883.     if (block_size == 2) {

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

  885.             return AVERROR_INVALIDDATA;

  886. 

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

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

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

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

  891.     } else {

  892.         uint16_t fgcolor, bgcolor;

  893.         int glyph;

  894. 

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

  896.             return AVERROR_INVALIDDATA;

  897. 

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

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

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

  901. 

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

  903.     }

  904.     return 0;

  905. }

  906. 

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

  908.                      int block_size)

  909. {

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

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

  912. 

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

  914. 

  915.     if (!good) {

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

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

  918.     }

  919. 

  920.     return good;

  921. }

  922. 

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

  924. {

  925.     int16_t mx, my, index;

  926.     int opcode;

  927. 

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

  929.         return AVERROR_INVALIDDATA;

  930. 

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

  932. 

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

  934.     switch (opcode) {

  935.     default:

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

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

  938. 

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

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

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

  942.                        blk_size, ctx->pitch);

  943.         }

  944.         break;

  945.     case 0xF5:

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

  947.             return AVERROR_INVALIDDATA;

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

  949. 

  950.         mx = index % ctx->width;

  951.         my = index / ctx->width;

  952. 

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

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

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

  956.                        blk_size, ctx->pitch);

  957.         }

  958.         break;

  959.     case 0xF6:

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

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

  962.                    blk_size, ctx->pitch);

  963.         break;

  964.     case 0xF7:

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

  966.         break;

  967. 

  968.     case 0xF8:

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

  970.         break;

  971.     case 0xF9:

  972.     case 0xFA:

  973.     case 0xFB:

  974.     case 0xFC:

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

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

  977.         break;

  978.     case 0xFD:

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

  980.             return AVERROR_INVALIDDATA;

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

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

  983.         break;

  984.     case 0xFE:

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

  986.             return AVERROR_INVALIDDATA;

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

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

  989.         break;

  990.     case 0xFF:

  991.         if (blk_size == 2) {

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

  993.         } else {

  994.             blk_size >>= 1;

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

  996.                 return AVERROR_INVALIDDATA;

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

  998.                 return AVERROR_INVALIDDATA;

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

  1000.                 return AVERROR_INVALIDDATA;

  1001.             if (codec2subblock(ctx, cx + blk_size, cy + blk_size, blk_size))

  1002.                 return AVERROR_INVALIDDATA;

  1003.         }

  1004.         break;

  1005.     }

  1006.     return 0;

  1007. }

  1008. 

  1009. static int decode_2(SANMVideoContext *ctx)

  1010. {

  1011.     int cx, cy, ret;

  1012. 

  1013.     for (cy = 0; cy < ctx->aligned_height; cy += 8) {

  1014.         for (cx = 0; cx < ctx->aligned_width; cx += 8) {

  1015.             if (ret = codec2subblock(ctx, cx, cy, 8))

  1016.                 return ret;

  1017.         }

  1018.     }

  1019. 

  1020.     return 0;

  1021. }

  1022. 

  1023. static int decode_3(SANMVideoContext *ctx)

  1024. {

  1025.     memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);

  1026.     return 0;

  1027. }

  1028. 

  1029. static int decode_4(SANMVideoContext *ctx)

  1030. {

  1031.     memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);

  1032.     return 0;

  1033. }

  1034. 

  1035. static int decode_5(SANMVideoContext *ctx)

  1036. {

  1037. #if HAVE_BIGENDIAN

  1038.     uint16_t *frm;

  1039.     int npixels;

  1040. #endif

  1041.     uint8_t *dst = (uint8_t*)ctx->frm0;

  1042. 

  1043.     if (rle_decode(ctx, dst, ctx->buf_size))

  1044.         return AVERROR_INVALIDDATA;

  1045. 

  1046. #if HAVE_BIGENDIAN

  1047.     npixels = ctx->npixels;

  1048.     frm = ctx->frm0;

  1049.     while (npixels--)

  1050.         *frm++ = av_bswap16(*frm);

  1051. #endif

  1052. 

  1053.     return 0;

  1054. }

  1055. 

  1056. static int decode_6(SANMVideoContext *ctx)

  1057. {

  1058.     int npixels = ctx->npixels;

  1059.     uint16_t *frm = ctx->frm0;

  1060. 

  1061.     if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {

  1062.         av_log(ctx->avctx, AV_LOG_ERROR, "insufficient data for frame\n");

  1063.         return AVERROR_INVALIDDATA;

  1064.     }

  1065.     while (npixels--)

  1066.         *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1067. 

  1068.     return 0;

  1069. }

  1070. 

  1071. static int decode_8(SANMVideoContext *ctx)

  1072. {

  1073.     uint16_t *pdest = ctx->frm0;

  1074.     uint8_t *rsrc;

  1075.     long npixels = ctx->npixels;

  1076. 

  1077.     av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);

  1078.     if (!ctx->rle_buf) {

  1079.         av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed\n");

  1080.         return AVERROR(ENOMEM);

  1081.     }

  1082.     rsrc = ctx->rle_buf;

  1083. 

  1084.     if (rle_decode(ctx, rsrc, npixels))

  1085.         return AVERROR_INVALIDDATA;

  1086. 

  1087.     while (npixels--)

  1088.         *pdest++ = ctx->codebook[*rsrc++];

  1089. 

  1090.     return 0;

  1091. }

  1092. 

  1093. typedef int (*frm_decoder)(SANMVideoContext *ctx);

  1094. 

  1095. static const frm_decoder v1_decoders[] = {

  1096.     decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,

  1097.     decode_6, decode_nop, decode_8

  1098. };

  1099. 

  1100. static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1101. {

  1102.     int i, ret;

  1103. 

  1104.     if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {

  1105.         av_log(ctx->avctx, AV_LOG_ERROR, "too short input frame (%d bytes)\n",

  1106.                ret);

  1107.         return AVERROR_INVALIDDATA;

  1108.     }

  1109.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1110. 

  1111.     hdr->width  = bytestream2_get_le32u(&ctx->gb);

  1112.     hdr->height = bytestream2_get_le32u(&ctx->gb);

  1113. 

  1114.     if (hdr->width != ctx->width || hdr->height != ctx->height) {

  1115.         av_log(ctx->avctx, AV_LOG_ERROR, "variable size frames are not implemented\n");

  1116.         return AVERROR_PATCHWELCOME;

  1117.     }

  1118. 

  1119.     hdr->seq_num     = bytestream2_get_le16u(&ctx->gb);

  1120.     hdr->codec       = bytestream2_get_byteu(&ctx->gb);

  1121.     hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);

  1122. 

  1123.     bytestream2_skip(&ctx->gb, 4); // skip pad

  1124. 

  1125.     for (i = 0; i < 4; i++)

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

  1127.     hdr->bg_color = bytestream2_get_le16u(&ctx->gb);

  1128. 

  1129.     bytestream2_skip(&ctx->gb, 2); // skip pad

  1130. 

  1131.     hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);

  1132.     for (i = 0; i < 256; i++)

  1133.         ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1134. 

  1135.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1136. 

  1137.     av_dlog(ctx->avctx, "subcodec %d\n", hdr->codec);

  1138.     return 0;

  1139. }

  1140. 

  1141. static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)

  1142. {

  1143.     while (buf_size--)

  1144.         *pbuf++ = color;

  1145. }

  1146. 

  1147. static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1148. {

  1149.     uint8_t *dst;

  1150.     const uint8_t *src = (uint8_t*) ctx->frm0;

  1151.     int ret, dstpitch, height = ctx->height;

  1152.     int srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);

  1153. 

  1154.     if ((ret = ff_get_buffer(ctx->avctx, ctx->output)) < 0) {

  1155.         av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1156.         return ret;

  1157.     }

  1158. 

  1159.     dst      = ctx->output->data[0];

  1160.     dstpitch = ctx->output->linesize[0];

  1161. 

  1162.     while (height--) {

  1163.         memcpy(dst, src, srcpitch);

  1164.         src += srcpitch;

  1165.         dst += dstpitch;

  1166.     }

  1167. 

  1168.     return 0;

  1169. }

  1170. 

  1171. static int decode_frame(AVCodecContext *avctx, void *data,

  1172.                         int *got_frame_ptr, AVPacket *pkt)

  1173. {

  1174.     SANMVideoContext *ctx = avctx->priv_data;

  1175.     int i, ret;

  1176. 

  1177.     bytestream2_init(&ctx->gb, pkt->data, pkt->size);

  1178.     if (ctx->output->data[0])

  1179.         avctx->release_buffer(avctx, ctx->output);

  1180. 

  1181.     if (!ctx->version) {

  1182.         int to_store = 0;

  1183. 

  1184.         while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {

  1185.             uint32_t sig, size;

  1186.             int pos;

  1187. 

  1188.             sig  = bytestream2_get_be32u(&ctx->gb);

  1189.             size = bytestream2_get_be32u(&ctx->gb);

  1190.             pos  = bytestream2_tell(&ctx->gb);

  1191. 

  1192.             if (bytestream2_get_bytes_left(&ctx->gb) < size) {

  1193.                 av_log(avctx, AV_LOG_ERROR, "incorrect chunk size %d\n", size);

  1194.                 break;

  1195.             }

  1196.             switch (sig) {

  1197.             case MKBETAG('N', 'P', 'A', 'L'):

  1198.                 if (size != 256 * 3) {

  1199.                     av_log(avctx, AV_LOG_ERROR, "incorrect palette block size %d\n",

  1200.                            size);

  1201.                     return AVERROR_INVALIDDATA;

  1202.                 }

  1203.                 for (i = 0; i < 256; i++)

  1204.                     ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1205.                 break;

  1206.             case MKBETAG('F', 'O', 'B', 'J'):

  1207.                 if (size < 16)

  1208.                     return AVERROR_INVALIDDATA;

  1209.                 if (ret = process_frame_obj(ctx))

  1210.                     return ret;

  1211.                 break;

  1212.             case MKBETAG('X', 'P', 'A', 'L'):

  1213.                 if (size == 6 || size == 4) {

  1214.                     uint8_t tmp[3];

  1215.                     int j;

  1216. 

  1217.                     for (i = 0; i < 256; i++) {

  1218.                         for (j = 0; j < 3; j++) {

  1219.                             int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;

  1220.                             tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);

  1221.                         }

  1222.                         ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);

  1223.                     }

  1224.                 } else {

  1225.                     if (size < 768 * 2 + 4) {

  1226.                         av_log(avctx, AV_LOG_ERROR, "incorrect palette change block size %d\n",

  1227.                                size);

  1228.                         return AVERROR_INVALIDDATA;

  1229.                     }

  1230.                     bytestream2_skipu(&ctx->gb, 4);

  1231.                     for (i = 0; i < 768; i++)

  1232.                         ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);

  1233.                     if (size >= 768 * 5 + 4) {

  1234.                         for (i = 0; i < 256; i++)

  1235.                             ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1236.                     } else {

  1237.                         memset(ctx->pal, 0, sizeof(ctx->pal));

  1238.                     }

  1239.                 }

  1240.                 break;

  1241.             case MKBETAG('S', 'T', 'O', 'R'):

  1242.                 to_store = 1;

  1243.                 break;

  1244.             case MKBETAG('F', 'T', 'C', 'H'):

  1245.                 memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);

  1246.                 break;

  1247.             default:

  1248.                 bytestream2_skip(&ctx->gb, size);

  1249.                 av_log(avctx, AV_LOG_DEBUG, "unknown/unsupported chunk %x\n", sig);

  1250.                 break;

  1251.             }

  1252. 

  1253.             bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);

  1254.             if (size & 1)

  1255.                 bytestream2_skip(&ctx->gb, 1);

  1256.         }

  1257.         if (to_store)

  1258.             memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);

  1259.         if ((ret = copy_output(ctx, NULL)))

  1260.             return ret;

  1261.         memcpy(ctx->output->data[1], ctx->pal, 1024);

  1262.     } else {

  1263.         SANMFrameHeader header;

  1264. 

  1265.         if ((ret = read_frame_header(ctx, &header)))

  1266.             return ret;

  1267. 

  1268.         ctx->rotate_code = header.rotate_code;

  1269.         if ((ctx->output->key_frame = !header.seq_num)) {

  1270.             ctx->output->pict_type = AV_PICTURE_TYPE_I;

  1271.             fill_frame(ctx->frm1, ctx->npixels, header.bg_color);

  1272.             fill_frame(ctx->frm2, ctx->npixels, header.bg_color);

  1273.         } else {

  1274.             ctx->output->pict_type = AV_PICTURE_TYPE_P;

  1275.         }

  1276. 

  1277.         if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {

  1278.             if ((ret = v1_decoders[header.codec](ctx))) {

  1279.                 av_log(avctx, AV_LOG_ERROR,

  1280.                        "subcodec %d: error decoding frame\n", header.codec);

  1281.                 return ret;

  1282.             }

  1283.         } else {

  1284.             av_log_ask_for_sample(avctx, "subcodec %d is not implemented\n",

  1285.                    header.codec);

  1286.             return AVERROR_PATCHWELCOME;

  1287.         }

  1288. 

  1289.         if ((ret = copy_output(ctx, &header)))

  1290.             return ret;

  1291.     }

  1292.     if (ctx->rotate_code)

  1293.         rotate_bufs(ctx, ctx->rotate_code);

  1294. 

  1295.     *got_frame_ptr  = 1;

  1296.     *(AVFrame*)data = *ctx->output;

  1297. 

  1298.     return pkt->size;

  1299. }

  1300. 

  1301. AVCodec ff_sanm_decoder = {

  1302.     .name           = "sanm",

  1303.     .type           = AVMEDIA_TYPE_VIDEO,

  1304.     .id             = AV_CODEC_ID_SANM,

  1305.     .priv_data_size = sizeof(SANMVideoContext),

  1306.     .init           = decode_init,

  1307.     .close          = decode_end,

  1308.     .decode         = decode_frame,

  1309.     .capabilities   = CODEC_CAP_DR1,

  1310.     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts SMUSH video"),

  1311. };