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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 "bytestream.h"

  27. #include "libavutil/bswap.h"

  28. #include "sanm_data.h"

  29. 

  30. #define NGLYPHS 256

  31. 

  32. typedef struct {

  33.     AVCodecContext *avctx;

  34.     GetByteContext gb;

  35. 

  36.     int version, subversion;

  37.     uint32_t pal[256];

  38.     int16_t delta_pal[768];

  39. 

  40.     int pitch;

  41.     int width, height;

  42.     int aligned_width, aligned_height;

  43.     int prev_seq;

  44. 

  45.     AVFrame frame, *output;

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

  47.     uint8_t *stored_frame;

  48.     uint32_t frm0_size, frm1_size, frm2_size;

  49.     uint32_t stored_frame_size;

  50. 

  51.     uint8_t *rle_buf;

  52.     unsigned int rle_buf_size;

  53. 

  54.     int rotate_code;

  55. 

  56.     long npixels, buf_size;

  57. 

  58.     uint16_t codebook[256];

  59.     uint16_t small_codebook[4];

  60. 

  61.     int8_t p4x4glyphs[NGLYPHS][16];

  62.     int8_t p8x8glyphs[NGLYPHS][64];

  63. } SANMVideoContext;

  64. 

  65. typedef struct {

  66.     int seq_num, codec, rotate_code, rle_output_size;

  67. 

  68.     uint16_t bg_color;

  69.     uint32_t width, height;

  70. } SANMFrameHeader;

  71. 

  72. enum GlyphEdge {

  73.     LEFT_EDGE,

  74.     TOP_EDGE,

  75.     RIGHT_EDGE,

  76.     BOTTOM_EDGE,

  77.     NO_EDGE

  78. };

  79. 

  80. enum GlyphDir {

  81.     DIR_LEFT,

  82.     DIR_UP,

  83.     DIR_RIGHT,

  84.     DIR_DOWN,

  85.     NO_DIR

  86. };

  87. 

  88. /**

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

  90.  *

  91.  * @param x x point coordinate

  92.  * @param y y point coordinate

  93.  * @param edge_size box width/height.

  94.  */

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

  96. {

  97.     const int edge_max = edge_size - 1;

  98. 

  99.     if (!y) {

  100.         return BOTTOM_EDGE;

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

  102.         return TOP_EDGE;

  103.     } else if (!x) {

  104.         return LEFT_EDGE;

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

  106.         return RIGHT_EDGE;

  107.     } else {

  108.         return NO_EDGE;

  109.     }

  110. }

  111. 

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

  113. {

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

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

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

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

  118.         return DIR_UP;

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

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

  121.         return DIR_DOWN;

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

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

  124.         return DIR_LEFT;

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

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

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

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

  129.         return DIR_RIGHT;

  130.     }

  131. 

  132.     return NO_DIR;

  133. }

  134. 

  135. /**

  136.  * Interpolate two points.

  137.  */

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

  139.                          int pos, int npoints)

  140. {

  141.     if (npoints) {

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

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

  144.     } else {

  145.         points[0] = x0;

  146.         points[1] = y0;

  147.     }

  148. }

  149. 

  150. /**

  151.  * Construct glyphs by iterating through vectors coordinates.

  152.  *

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

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

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

  156.  * @param side_length glyph width/height.

  157.  */

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

  159.                         const int side_length)

  160. {

  161.     const int glyph_size = side_length * side_length;

  162.     int8_t *pglyph = pglyphs;

  163. 

  164.     int i, j;

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

  166.         int x0    = xvec[i];

  167.         int y0    = yvec[i];

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

  169. 

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

  171.             int x1      = xvec[j];

  172.             int y1      = yvec[j];

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

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

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

  176.             int ipoint;

  177. 

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

  179.                 int8_t point[2];

  180.                 int irow, icol;

  181. 

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

  183. 

  184.                 switch (dir) {

  185.                 case DIR_UP:

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

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

  188.                     break;

  189. 

  190.                 case DIR_DOWN:

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

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

  193.                     break;

  194. 

  195.                 case DIR_LEFT:

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

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

  198.                     break;

  199. 

  200.                 case DIR_RIGHT:

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

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

  203.                     break;

  204.                 }

  205.             }

  206.         }

  207.     }

  208. }

  209. 

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

  211. {

  212.     ctx->width   = width;

  213.     ctx->height  = height;

  214.     ctx->npixels = width * height;

  215. 

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

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

  218. 

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

  220.     ctx->pitch    = width;

  221. }

  222. 

  223. static void destroy_buffers(SANMVideoContext *ctx)

  224. {

  225.     av_freep(&ctx->frm0);

  226.     av_freep(&ctx->frm1);

  227.     av_freep(&ctx->frm2);

  228.     av_freep(&ctx->stored_frame);

  229.     av_freep(&ctx->rle_buf);

  230. }

  231. 

  232. static av_cold int init_buffers(SANMVideoContext *ctx)

  233. {

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

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

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

  237.     if (!ctx->version)

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

  239. 

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

  241.         destroy_buffers(ctx);

  242.         return AVERROR(ENOMEM);

  243.     }

  244. 

  245.     return 0;

  246. }

  247. 

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

  249. {

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

  251.     if (rotate_code == 2)

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

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

  254. }

  255. 

  256. static av_cold int decode_init(AVCodecContext *avctx)

  257. {

  258.     SANMVideoContext *ctx = avctx->priv_data;

  259. 

  260.     ctx->avctx     = avctx;

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

  262. 

  263.     avctx->pix_fmt = ctx->version ? PIX_FMT_RGB565 : PIX_FMT_PAL8;

  264. 

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

  266.     if (init_buffers(ctx)) {

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

  268.         return AVERROR(ENOMEM);

  269.     }

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

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

  272. 

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

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

  275. 

  276.     if (!ctx->version) {

  277.         int i;

  278. 

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

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

  281.             return AVERROR_INVALIDDATA;

  282.         }

  283. 

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

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

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

  287.     }

  288. 

  289.     return 0;

  290. }

  291. 

  292. static av_cold int decode_end(AVCodecContext *avctx)

  293. {

  294.     SANMVideoContext *ctx = avctx->priv_data;

  295. 

  296.     destroy_buffers(ctx);

  297. 

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

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

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

  301.     }

  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.     ctx->rotate_code = 0;

  417. 

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

  419.         rotate_bufs(ctx, 1);

  420. 

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

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

  423. 

  424.     if (mvoff > 2) {

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

  426.         return AVERROR_INVALIDDATA;

  427.     }

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

  429.     switch (compr) {

  430.     case 0:

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

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

  433.             dst += stride;

  434.         }

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

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

  437.         break;

  438.     case 2:

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

  440.             return AVERROR_INVALIDDATA;

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

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

  443.         break;

  444.     case 3:

  445.     case 4:

  446.         if (flags & 4) {

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

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

  449.                     int code;

  450.                     if (skip_run) {

  451.                         skip_run--;

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

  453.                             memcpy(dst + i + k * stride, prev + i + k * stride, 4);

  454.                         continue;

  455.                     }

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

  457.                         return AVERROR_INVALIDDATA;

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

  459.                     switch (code) {

  460.                     case 0xFF:

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

  462.                             return AVERROR_INVALIDDATA;

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

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

  465.                         break;

  466.                     case 0xFE:

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

  468.                             return AVERROR_INVALIDDATA;

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

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

  471.                         break;

  472.                     case 0xFD:

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

  474.                             return AVERROR_INVALIDDATA;

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

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

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

  478.                         break;

  479.                     default:

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

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

  482.                                 return AVERROR_INVALIDDATA;

  483.                             skip_run = bytestream2_get_byteu(&ctx->gb);

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

  485.                                 memcpy(dst + i + k * stride, prev + i + k * stride, 4);

  486.                         } else {

  487.                             int mx, my;

  488. 

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

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

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

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

  493.                         }

  494.                     }

  495.                 }

  496.                 dst  += stride * 4;

  497.                 prev += stride * 4;

  498.             }

  499.         } else {

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

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

  502.                     int code;

  503.                     if (skip_run) {

  504.                         skip_run--;

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

  506.                             memcpy(dst + i + k * stride, prev + i + k * stride, 4);

  507.                         continue;

  508.                     }

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

  510.                     if (code == 0xFF) {

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

  512.                             return AVERROR_INVALIDDATA;

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

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

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

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

  517.                             return AVERROR_INVALIDDATA;

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

  519.                         i -= 4;

  520.                     } else {

  521.                         int mx, my;

  522. 

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

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

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

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

  527.                     }

  528.                 }

  529.                 dst  += stride * 4;

  530.                 prev += stride * 4;

  531.             }

  532.         }

  533.         break;

  534.     default:

  535.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  537.         return AVERROR_PATCHWELCOME;

  538.     }

  539. 

  540.     return 0;

  541. }

  542. 

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

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

  545. {

  546.     int code, k, t;

  547.     uint8_t colors[2];

  548.     int8_t *pglyph;

  549. 

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

  551.         return AVERROR_INVALIDDATA;

  552. 

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

  554.     if (code >= 0xF8) {

  555.         switch (code) {

  556.         case 0xFF:

  557.             if (size == 2) {

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

  559.                     return AVERROR_INVALIDDATA;

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

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

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

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

  564.             } else {

  565.                 size >>= 1;

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

  567.                     return AVERROR_INVALIDDATA;

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

  569.                                   stride, tbl, size))

  570.                     return AVERROR_INVALIDDATA;

  571.                 dst   += size * stride;

  572.                 prev1 += size * stride;

  573.                 prev2 += size * stride;

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

  575.                     return AVERROR_INVALIDDATA;

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

  577.                                   stride, tbl, size))

  578.                     return AVERROR_INVALIDDATA;

  579.             }

  580.             break;

  581.         case 0xFE:

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

  583.                 return AVERROR_INVALIDDATA;

  584. 

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

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

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

  588.             break;

  589.         case 0xFD:

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

  591.                 return AVERROR_INVALIDDATA;

  592. 

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

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

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

  596. 

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

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

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

  600.             break;

  601.         case 0xFC:

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

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

  604.             break;

  605.         default:

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

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

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

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

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

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

  612.         }

  613.     } else {

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

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

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

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

  618.     }

  619. 

  620.     return 0;

  621. }

  622. 

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

  624.                        int left, int width, int height)

  625. {

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

  627.     int stride     = ctx->pitch;

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

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

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

  631.     uint32_t decoded_size;

  632. 

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

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

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

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

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

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

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

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

  641. 

  642.     if (skip & 1)

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

  644.     if (!seq) {

  645.         ctx->prev_seq = -1;

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

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

  648.     }

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

  650.     switch (compr) {

  651.     case 0:

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

  653.             return AVERROR_INVALIDDATA;

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

  655.             for (i = 0; i < width; i++)

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

  657.             dst += stride;

  658.         }

  659.         break;

  660.     case 1:

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

  662.             return AVERROR_INVALIDDATA;

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

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

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

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

  667.             }

  668.             dst += stride * 2;

  669.         }

  670.         break;

  671.     case 2:

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

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

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

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

  676.                                       tbl_pos + 8, 8))

  677.                         return AVERROR_INVALIDDATA;

  678.                 }

  679.                 dst   += stride * 8;

  680.                 prev1 += stride * 8;

  681.                 prev2 += stride * 8;

  682.             }

  683.         }

  684.         break;

  685.     case 3:

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

  687.         break;

  688.     case 4:

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

  690.         break;

  691.     case 5:

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

  693.             return AVERROR_INVALIDDATA;

  694.         break;

  695.     default:

  696.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  698.         return AVERROR_PATCHWELCOME;

  699.     }

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

  701.         ctx->rotate_code = new_rot;

  702.     else

  703.         ctx->rotate_code = 0;

  704.     ctx->prev_seq = seq;

  705. 

  706.     return 0;

  707. }

  708. 

  709. static int process_frame_obj(SANMVideoContext *ctx)

  710. {

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

  712. 

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

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

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

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

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

  718. 

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

  720.         ctx->avctx->width  = FFMAX(left + w, ctx->width);

  721.         ctx->avctx->height = FFMAX(top + h, ctx->height);

  722.         init_sizes(ctx, left + w, top + h);

  723.         if (init_buffers(ctx)) {

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

  725.             return AVERROR(ENOMEM);

  726.         }

  727.     }

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

  729. 

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

  731.     switch (codec) {

  732.     case 1:

  733.     case 3:

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

  735.         break;

  736.     case 37:

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

  738.         break;

  739.     case 47:

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

  741.         break;

  742.     default:

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

  744.         return AVERROR_PATCHWELCOME;

  745.     }

  746. }

  747. 

  748. static int decode_0(SANMVideoContext *ctx)

  749. {

  750.     uint16_t *frm = ctx->frm0;

  751.     int x, y;

  752. 

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

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

  755.         return AVERROR_INVALIDDATA;

  756.     }

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

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

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

  760.         frm += ctx->pitch;

  761.     }

  762.     return 0;

  763. }

  764. 

  765. static int decode_nop(SANMVideoContext *ctx)

  766. {

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

  768.     return AVERROR_PATCHWELCOME;

  769. }

  770. 

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

  772. {

  773.     int y;

  774. 

  775.     for (y = 0; y != block_size; y++, pdest += pitch, psrc += pitch)

  776.         memcpy(pdest, psrc, block_size * sizeof(pdest[0]));

  777. }

  778. 

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

  780. {

  781.     int x, y;

  782. 

  783.     pitch -= block_size;

  784.     for (y = 0; y != block_size; y++, pdest += pitch)

  785.         for (x = 0; x != block_size; x++)

  786.             *pdest++ = color;

  787. }

  788. 

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

  790.                       uint16_t bg_color, int block_size, int pitch)

  791. {

  792.     int8_t *pglyph;

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

  794.     int x, y;

  795. 

  796.     if (index > NGLYPHS) {

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

  798.         return AVERROR_INVALIDDATA;

  799.     }

  800. 

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

  802.     pitch -= block_size;

  803. 

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

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

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

  807.     return 0;

  808. }

  809. 

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

  811. {

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

  813. 

  814.     if (block_size == 2) {

  815.         uint32_t indices;

  816. 

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

  818.             return AVERROR_INVALIDDATA;

  819. 

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

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

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

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

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

  825.     } else {

  826.         uint16_t fgcolor, bgcolor;

  827.         int glyph;

  828. 

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

  830.             return AVERROR_INVALIDDATA;

  831. 

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

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

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

  835. 

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

  837.     }

  838.     return 0;

  839. }

  840. 

  841. static int opcode_0xf8(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.         if (bytestream2_get_bytes_left(&ctx->gb) < 8)

  847.             return AVERROR_INVALIDDATA;

  848. 

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

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

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

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

  853.     } else {

  854.         uint16_t fgcolor, bgcolor;

  855.         int glyph;

  856. 

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

  858.             return AVERROR_INVALIDDATA;

  859. 

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

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

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

  863. 

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

  865.     }

  866.     return 0;

  867. }

  868. 

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

  870.                      int block_size)

  871. {

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

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

  874. 

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

  876. 

  877.     if (!good) {

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

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

  880.     }

  881. 

  882.     return good;

  883. }

  884. 

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

  886. {

  887.     int16_t mx, my, index;

  888.     int opcode;

  889. 

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

  891.         return AVERROR_INVALIDDATA;

  892. 

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

  894. 

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

  896.     switch (opcode) {

  897.     default:

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

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

  900. 

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

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

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

  904.                        blk_size, ctx->pitch);

  905.         }

  906.         break;

  907.     case 0xF5:

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

  909.             return AVERROR_INVALIDDATA;

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

  911. 

  912.         mx = index % ctx->width;

  913.         my = index / ctx->width;

  914. 

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

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

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

  918.                        blk_size, ctx->pitch);

  919.         }

  920.         break;

  921.     case 0xF6:

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

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

  924.                    blk_size, ctx->pitch);

  925.         break;

  926.     case 0xF7:

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

  928.         break;

  929. 

  930.     case 0xF8:

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

  932.         break;

  933.     case 0xF9:

  934.     case 0xFA:

  935.     case 0xFB:

  936.     case 0xFC:

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

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

  939.         break;

  940.     case 0xFD:

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

  942.             return AVERROR_INVALIDDATA;

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

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

  945.         break;

  946.     case 0xFE:

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

  948.             return AVERROR_INVALIDDATA;

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

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

  951.         break;

  952.     case 0xFF:

  953.         if (blk_size == 2) {

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

  955.         } else {

  956.             blk_size >>= 1;

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

  958.                 return AVERROR_INVALIDDATA;

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

  960.                 return AVERROR_INVALIDDATA;

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

  962.                 return AVERROR_INVALIDDATA;

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

  964.                 return AVERROR_INVALIDDATA;

  965.         }

  966.         break;

  967.     }

  968.     return 0;

  969. }

  970. 

  971. static int decode_2(SANMVideoContext *ctx)

  972. {

  973.     int cx, cy, ret;

  974. 

  975.     for (cy = 0; cy != ctx->aligned_height; cy += 8) {

  976.         for (cx = 0; cx != ctx->aligned_width; cx += 8) {

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

  978.                 return ret;

  979.         }

  980.     }

  981. 

  982.     return 0;

  983. }

  984. 

  985. static int decode_3(SANMVideoContext *ctx)

  986. {

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

  988.     return 0;

  989. }

  990. 

  991. static int decode_4(SANMVideoContext *ctx)

  992. {

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

  994.     return 0;

  995. }

  996. 

  997. static int decode_5(SANMVideoContext *ctx)

  998. {

  999. #if HAVE_BIGENDIAN

  1000.     uint16_t *frm;

  1001.     int npixels;

  1002. #endif

  1003.     uint8_t *dst = (uint8_t*)ctx->frm0;

  1004. 

  1005.     if (rle_decode(ctx, dst, ctx->buf_size))

  1006.         return AVERROR_INVALIDDATA;

  1007. 

  1008. #if HAVE_BIGENDIAN

  1009.     npixels = ctx->npixels;

  1010.     frm = ctx->frm0;

  1011.     while (npixels--)

  1012.         *frm++ = av_bswap16(*frm);

  1013. #endif

  1014. 

  1015.     return 0;

  1016. }

  1017. 

  1018. static int decode_6(SANMVideoContext *ctx)

  1019. {

  1020.     int npixels = ctx->npixels;

  1021.     uint16_t *frm = ctx->frm0;

  1022. 

  1023.     if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {

  1024.         av_log(ctx->avctx, AV_LOG_ERROR, "insufficient data for frame\n");

  1025.         return AVERROR_INVALIDDATA;

  1026.     }

  1027.     while (npixels--)

  1028.         *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1029. 

  1030.     return 0;

  1031. }

  1032. 

  1033. static int decode_8(SANMVideoContext *ctx)

  1034. {

  1035.     uint16_t *pdest = ctx->frm0;

  1036.     uint8_t *rsrc;

  1037.     long npixels = ctx->npixels;

  1038. 

  1039.     av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);

  1040.     if (!ctx->rle_buf) {

  1041.         av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed\n");

  1042.         return AVERROR(ENOMEM);

  1043.     }

  1044.     rsrc = ctx->rle_buf;

  1045. 

  1046.     if (rle_decode(ctx, rsrc, npixels))

  1047.         return AVERROR_INVALIDDATA;

  1048. 

  1049.     while (npixels--)

  1050.         *pdest++ = ctx->codebook[*rsrc++];

  1051. 

  1052.     return 0;

  1053. }

  1054. 

  1055. typedef int (*frm_decoder)(SANMVideoContext *ctx);

  1056. 

  1057. static const frm_decoder v1_decoders[] = {

  1058.     decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,

  1059.     decode_6, decode_nop, decode_8

  1060. };

  1061. 

  1062. static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1063. {

  1064.     int i, ret;

  1065. 

  1066.     if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {

  1067.         av_log(ctx->avctx, AV_LOG_ERROR, "too short input frame (%d bytes)\n",

  1068.                ret);

  1069.         return AVERROR_INVALIDDATA;

  1070.     }

  1071.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1072. 

  1073.     hdr->width  = bytestream2_get_le32u(&ctx->gb);

  1074.     hdr->height = bytestream2_get_le32u(&ctx->gb);

  1075. 

  1076.     if (hdr->width != ctx->width || hdr->height != ctx->height) {

  1077.         av_log(ctx->avctx, AV_LOG_ERROR, "variable size frames are not implemented\n");

  1078.         return AVERROR_PATCHWELCOME;

  1079.     }

  1080. 

  1081.     hdr->seq_num     = bytestream2_get_le16u(&ctx->gb);

  1082.     hdr->codec       = bytestream2_get_byteu(&ctx->gb);

  1083.     hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);

  1084. 

  1085.     bytestream2_skip(&ctx->gb, 4); // skip pad

  1086. 

  1087.     for (i = 0; i < 4; i++)

  1088.         ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1089.     hdr->bg_color = bytestream2_get_le16u(&ctx->gb);

  1090. 

  1091.     bytestream2_skip(&ctx->gb, 2); // skip pad

  1092. 

  1093.     hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);

  1094.     for (i = 0; i < 256; i++)

  1095.         ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1096. 

  1097.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1098. 

  1099.     av_dlog(ctx->avctx, "subcodec %d\n", hdr->codec);

  1100.     return 0;

  1101. }

  1102. 

  1103. static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)

  1104. {

  1105.     while (buf_size--)

  1106.         *pbuf++ = color;

  1107. }

  1108. 

  1109. static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1110. {

  1111.     uint8_t *dst;

  1112.     const uint8_t *src = (uint8_t*) ctx->frm0;

  1113.     int ret, dstpitch, height = ctx->height;

  1114.     int srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);

  1115. 

  1116.     if ((ret = ctx->avctx->get_buffer(ctx->avctx, ctx->output)) < 0) {

  1117.         av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1118.         return ret;

  1119.     }

  1120. 

  1121.     dst      = ctx->output->data[0];

  1122.     dstpitch = ctx->output->linesize[0];

  1123. 

  1124.     while (height--) {

  1125.         memcpy(dst, src, srcpitch);

  1126.         src += srcpitch;

  1127.         dst += dstpitch;

  1128.     }

  1129. 

  1130.     return 0;

  1131. }

  1132. 

  1133. static int decode_frame(AVCodecContext *avctx, void *data,

  1134.                         int *got_frame_ptr, AVPacket *pkt)

  1135. {

  1136.     SANMVideoContext *ctx = avctx->priv_data;

  1137.     int i, ret;

  1138. 

  1139.     bytestream2_init(&ctx->gb, pkt->data, pkt->size);

  1140.     if (ctx->output->data[0])

  1141.         avctx->release_buffer(avctx, ctx->output);

  1142. 

  1143.     if (!ctx->version) {

  1144.         int to_store = 0;

  1145. 

  1146.         while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {

  1147.             uint32_t sig, size;

  1148.             int pos;

  1149. 

  1150.             sig  = bytestream2_get_be32u(&ctx->gb);

  1151.             size = bytestream2_get_be32u(&ctx->gb);

  1152.             pos  = bytestream2_tell(&ctx->gb);

  1153. 

  1154.             if (bytestream2_get_bytes_left(&ctx->gb) < size) {

  1155.                 av_log(avctx, AV_LOG_ERROR, "incorrect chunk size %d\n", size);

  1156.                 break;

  1157.             }

  1158.             switch (sig) {

  1159.             case MKBETAG('N', 'P', 'A', 'L'):

  1160.                 if (size != 256 * 3) {

  1161.                     av_log(avctx, AV_LOG_ERROR, "incorrect palette block size %d\n",

  1162.                            size);

  1163.                     return AVERROR_INVALIDDATA;

  1164.                 }

  1165.                 for (i = 0; i < 256; i++)

  1166.                     ctx->pal[i] = 0xFF << 24 | bytestream2_get_be24u(&ctx->gb);

  1167.                 break;

  1168.             case MKBETAG('F', 'O', 'B', 'J'):

  1169.                 if (size < 16)

  1170.                     return AVERROR_INVALIDDATA;

  1171.                 if (ret = process_frame_obj(ctx))

  1172.                     return ret;

  1173.                 break;

  1174.             case MKBETAG('X', 'P', 'A', 'L'):

  1175.                 if (size == 6 || size == 4) {

  1176.                     uint8_t tmp[3];

  1177.                     int j;

  1178. 

  1179.                     for (i = 0; i < 256; i++) {

  1180.                         for (j = 0; j < 3; j++) {

  1181.                             int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;

  1182.                             tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);

  1183.                         }

  1184.                         ctx->pal[i] = 0xFF << 24 | AV_RB24(tmp);

  1185.                     }

  1186.                 } else {

  1187.                     if (size < 768 * 2 + 4) {

  1188.                         av_log(avctx, AV_LOG_ERROR, "incorrect palette change block size %d\n",

  1189.                                size);

  1190.                         return AVERROR_INVALIDDATA;

  1191.                     }

  1192.                     bytestream2_skipu(&ctx->gb, 4);

  1193.                     for (i = 0; i < 768; i++)

  1194.                         ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);

  1195.                     if (size >= 768 * 5 + 4) {

  1196.                         for (i = 0; i < 256; i++)

  1197.                             ctx->pal[i] = 0xFF << 24 | bytestream2_get_be24u(&ctx->gb);

  1198.                     } else {

  1199.                         memset(ctx->pal, 0, sizeof(ctx->pal));

  1200.                     }

  1201.                 }

  1202.                 break;

  1203.             case MKBETAG('S', 'T', 'O', 'R'):

  1204.                 to_store = 1;

  1205.                 break;

  1206.             case MKBETAG('F', 'T', 'C', 'H'):

  1207.                 memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);

  1208.                 break;

  1209.             default:

  1210.                 bytestream2_skip(&ctx->gb, size);

  1211.                 av_log(avctx, AV_LOG_DEBUG, "unknown/unsupported chunk %x\n", sig);

  1212.                 break;

  1213.             }

  1214. 

  1215.             bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);

  1216.             if (size & 1)

  1217.                 bytestream2_skip(&ctx->gb, 1);

  1218.         }

  1219.         if (to_store)

  1220.             memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);

  1221.         if ((ret = copy_output(ctx, NULL)))

  1222.             return ret;

  1223.         memcpy(ctx->output->data[1], ctx->pal, 1024);

  1224.     } else {

  1225.         SANMFrameHeader header;

  1226. 

  1227.         if ((ret = read_frame_header(ctx, &header)))

  1228.             return ret;

  1229. 

  1230.         ctx->rotate_code = header.rotate_code;

  1231.         if ((ctx->output->key_frame = !header.seq_num)) {

  1232.             ctx->output->pict_type = AV_PICTURE_TYPE_I;

  1233.             fill_frame(ctx->frm1, ctx->npixels, header.bg_color);

  1234.             fill_frame(ctx->frm2, ctx->npixels, header.bg_color);

  1235.         } else {

  1236.             ctx->output->pict_type = AV_PICTURE_TYPE_P;

  1237.         }

  1238. 

  1239.         if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {

  1240.             if ((ret = v1_decoders[header.codec](ctx))) {

  1241.                 av_log(avctx, AV_LOG_ERROR,

  1242.                        "subcodec %d: error decoding frame\n", header.codec);

  1243.                 return ret;

  1244.             }

  1245.         } else {

  1246.             av_log_ask_for_sample(avctx, "subcodec %d is not implemented\n",

  1247.                    header.codec);

  1248.             return AVERROR_PATCHWELCOME;

  1249.         }

  1250. 

  1251.         if ((ret = copy_output(ctx, &header)))

  1252.             return ret;

  1253.     }

  1254.     if (ctx->rotate_code)

  1255.         rotate_bufs(ctx, ctx->rotate_code);

  1256. 

  1257.     *got_frame_ptr  = 1;

  1258.     *(AVFrame*)data = *ctx->output;

  1259. 

  1260.     return pkt->size;

  1261. }

  1262. 

  1263. AVCodec ff_sanm_decoder = {

  1264.     .name           = "sanm",

  1265.     .type           = AVMEDIA_TYPE_VIDEO,

  1266.     .id             = CODEC_ID_SANM,

  1267.     .priv_data_size = sizeof(SANMVideoContext),

  1268.     .init           = decode_init,

  1269.     .close          = decode_end,

  1270.     .decode         = decode_frame,

  1271.     .capabilities   = CODEC_CAP_DR1,

  1272.     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts SMUSH video"),

  1273. };