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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 "internal.h"

  28. #include "libavutil/bswap.h"

  29. #include "libavutil/imgutils.h"

  30. #include "libavcodec/dsputil.h"

  31. #include "sanm_data.h"

  32. 

  33. #define NGLYPHS 256

  34. 

  35. typedef struct {

  36.     AVCodecContext *avctx;

  37.     GetByteContext gb;

  38. 

  39.     int version, subversion;

  40.     uint32_t pal[256];

  41.     int16_t delta_pal[768];

  42. 

  43.     int pitch;

  44.     int width, height;

  45.     int aligned_width, aligned_height;

  46.     int prev_seq;

  47. 

  48.     AVFrame frame, *output;

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

  50.     uint8_t *stored_frame;

  51.     uint32_t frm0_size, frm1_size, frm2_size;

  52.     uint32_t stored_frame_size;

  53. 

  54.     uint8_t *rle_buf;

  55.     unsigned int rle_buf_size;

  56. 

  57.     int rotate_code;

  58. 

  59.     long npixels, buf_size;

  60. 

  61.     uint16_t codebook[256];

  62.     uint16_t small_codebook[4];

  63. 

  64.     int8_t p4x4glyphs[NGLYPHS][16];

  65.     int8_t p8x8glyphs[NGLYPHS][64];

  66. } SANMVideoContext;

  67. 

  68. typedef struct {

  69.     int seq_num, codec, rotate_code, rle_output_size;

  70. 

  71.     uint16_t bg_color;

  72.     uint32_t width, height;

  73. } SANMFrameHeader;

  74. 

  75. enum GlyphEdge {

  76.     LEFT_EDGE,

  77.     TOP_EDGE,

  78.     RIGHT_EDGE,

  79.     BOTTOM_EDGE,

  80.     NO_EDGE

  81. };

  82. 

  83. enum GlyphDir {

  84.     DIR_LEFT,

  85.     DIR_UP,

  86.     DIR_RIGHT,

  87.     DIR_DOWN,

  88.     NO_DIR

  89. };

  90. 

  91. /**

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

  93.  *

  94.  * @param x x point coordinate

  95.  * @param y y point coordinate

  96.  * @param edge_size box width/height.

  97.  */

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

  99. {

  100.     const int edge_max = edge_size - 1;

  101. 

  102.     if (!y) {

  103.         return BOTTOM_EDGE;

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

  105.         return TOP_EDGE;

  106.     } else if (!x) {

  107.         return LEFT_EDGE;

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

  109.         return RIGHT_EDGE;

  110.     } else {

  111.         return NO_EDGE;

  112.     }

  113. }

  114. 

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

  116. {

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

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

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

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

  121.         return DIR_UP;

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

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

  124.         return DIR_DOWN;

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

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

  127.         return DIR_LEFT;

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

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

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

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

  132.         return DIR_RIGHT;

  133.     }

  134. 

  135.     return NO_DIR;

  136. }

  137. 

  138. /**

  139.  * Interpolate two points.

  140.  */

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

  142.                          int pos, int npoints)

  143. {

  144.     if (npoints) {

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

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

  147.     } else {

  148.         points[0] = x0;

  149.         points[1] = y0;

  150.     }

  151. }

  152. 

  153. /**

  154.  * Construct glyphs by iterating through vectors coordinates.

  155.  *

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

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

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

  159.  * @param side_length glyph width/height.

  160.  */

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

  162.                         const int side_length)

  163. {

  164.     const int glyph_size = side_length * side_length;

  165.     int8_t *pglyph = pglyphs;

  166. 

  167.     int i, j;

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

  169.         int x0    = xvec[i];

  170.         int y0    = yvec[i];

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

  172. 

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

  174.             int x1      = xvec[j];

  175.             int y1      = yvec[j];

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

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

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

  179.             int ipoint;

  180. 

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

  182.                 int8_t point[2];

  183.                 int irow, icol;

  184. 

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

  186. 

  187.                 switch (dir) {

  188.                 case DIR_UP:

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

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

  191.                     break;

  192. 

  193.                 case DIR_DOWN:

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

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

  196.                     break;

  197. 

  198.                 case DIR_LEFT:

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

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

  201.                     break;

  202. 

  203.                 case DIR_RIGHT:

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

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

  206.                     break;

  207.                 }

  208.             }

  209.         }

  210.     }

  211. }

  212. 

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

  214. {

  215.     ctx->width   = width;

  216.     ctx->height  = height;

  217.     ctx->npixels = width * height;

  218. 

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

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

  221. 

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

  223.     ctx->pitch    = width;

  224. }

  225. 

  226. static void destroy_buffers(SANMVideoContext *ctx)

  227. {

  228.     av_freep(&ctx->frm0);

  229.     av_freep(&ctx->frm1);

  230.     av_freep(&ctx->frm2);

  231.     av_freep(&ctx->stored_frame);

  232.     av_freep(&ctx->rle_buf);

  233. }

  234. 

  235. static av_cold int init_buffers(SANMVideoContext *ctx)

  236. {

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

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

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

  240.     if (!ctx->version)

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

  242. 

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

  244.         destroy_buffers(ctx);

  245.         return AVERROR(ENOMEM);

  246.     }

  247. 

  248.     return 0;

  249. }

  250. 

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

  252. {

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

  254.     if (rotate_code == 2)

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

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

  257. }

  258. 

  259. static av_cold int decode_init(AVCodecContext *avctx)

  260. {

  261.     SANMVideoContext *ctx = avctx->priv_data;

  262. 

  263.     ctx->avctx     = avctx;

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

  265. 

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

  267. 

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

  269.     if (init_buffers(ctx)) {

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

  271.         return AVERROR(ENOMEM);

  272.     }

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

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

  275. 

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

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

  278. 

  279.     if (!ctx->version) {

  280.         int i;

  281. 

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

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

  284.             return AVERROR_INVALIDDATA;

  285.         }

  286. 

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

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

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

  290.     }

  291. 

  292.     return 0;

  293. }

  294. 

  295. static av_cold int decode_end(AVCodecContext *avctx)

  296. {

  297.     SANMVideoContext *ctx = avctx->priv_data;

  298. 

  299.     destroy_buffers(ctx);

  300. 

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

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

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

  304.     }

  305. 

  306.     return 0;

  307. }

  308. 

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

  310. {

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

  312. 

  313.     while (left > 0) {

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

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

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

  317.             return AVERROR_INVALIDDATA;

  318. 

  319.         if (opcode & 1) {

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

  321.             memset(dst, color, run_len);

  322.         } else {

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

  324.                 return AVERROR_INVALIDDATA;

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

  326.         }

  327. 

  328.         dst  += run_len;

  329.         left -= run_len;

  330.     }

  331. 

  332.     return 0;

  333. }

  334. 

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

  336.                       int left, int width, int height)

  337. {

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

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

  340. 

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

  342.         pos = 0;

  343. 

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

  345.             return AVERROR_INVALIDDATA;

  346. 

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

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

  349. 

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

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

  352.                 return AVERROR_INVALIDDATA;

  353. 

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

  355.             flag = code & 1;

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

  357.             if (pos + code > width)

  358.                 return AVERROR_INVALIDDATA;

  359.             if (flag) {

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

  361.                 if (val)

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

  363.                 pos += code;

  364.             } else {

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

  366.                     return AVERROR_INVALIDDATA;

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

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

  369.                     if (val)

  370.                         dst[pos] = val;

  371.                     pos++;

  372.                 }

  373.             }

  374.         }

  375.         dst += ctx->pitch;

  376.     }

  377.     ctx->rotate_code = 0;

  378. 

  379.     return 0;

  380. }

  381. 

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

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

  384. {

  385.     int pos, i, j;

  386. 

  387.     pos = x + y * stride;

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

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

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

  391.                 dst[i] = 0;

  392.             else

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

  394.         }

  395.         dst += stride;

  396.         src += stride;

  397.         pos += stride;

  398.     }

  399. }

  400. 

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

  402.                        int left, int width, int height)

  403. {

  404.     int stride = ctx->pitch;

  405.     int i, j, k, t;

  406.     int skip_run = 0;

  407.     int compr, mvoff, seq, flags;

  408.     uint32_t decoded_size;

  409.     uint8_t *dst, *prev;

  410. 

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

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

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

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

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

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

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

  418. 

  419.     ctx->rotate_code = 0;

  420. 

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

  422.         rotate_bufs(ctx, 1);

  423. 

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

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

  426. 

  427.     if (mvoff > 2) {

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

  429.         return AVERROR_INVALIDDATA;

  430.     }

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

  432.     switch (compr) {

  433.     case 0:

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

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

  436.             dst += stride;

  437.         }

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

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

  440.         break;

  441.     case 2:

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

  443.             return AVERROR_INVALIDDATA;

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

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

  446.         break;

  447.     case 3:

  448.     case 4:

  449.         if (flags & 4) {

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

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

  452.                     int code;

  453.                     if (skip_run) {

  454.                         skip_run--;

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

  456.                         continue;

  457.                     }

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

  459.                         return AVERROR_INVALIDDATA;

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

  461.                     switch (code) {

  462.                     case 0xFF:

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

  464.                             return AVERROR_INVALIDDATA;

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

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

  467.                         break;

  468.                     case 0xFE:

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

  470.                             return AVERROR_INVALIDDATA;

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

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

  473.                         break;

  474.                     case 0xFD:

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

  476.                             return AVERROR_INVALIDDATA;

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

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

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

  480.                         break;

  481.                     default:

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

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

  484.                                 return AVERROR_INVALIDDATA;

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

  486.                             i -= 4;

  487.                         } else {

  488.                             int mx, my;

  489. 

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

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

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

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

  494.                         }

  495.                     }

  496.                 }

  497.                 dst  += stride * 4;

  498.                 prev += stride * 4;

  499.             }

  500.         } else {

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

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

  503.                     int code;

  504.                     if (skip_run) {

  505.                         skip_run--;

  506.                         copy_block4(dst + i, prev + i, stride, 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 (decoded_size > height * stride - left - top * stride) {

  643.         decoded_size = height * stride - left - top * stride;

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

  645.     }

  646. 

  647.     if (skip & 1)

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

  649.     if (!seq) {

  650.         ctx->prev_seq = -1;

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

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

  653.     }

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

  655.     switch (compr) {

  656.     case 0:

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

  658.             return AVERROR_INVALIDDATA;

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

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

  661.             dst += stride;

  662.         }

  663.         break;

  664.     case 1:

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

  666.             return AVERROR_INVALIDDATA;

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

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

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

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

  671.             }

  672.             dst += stride * 2;

  673.         }

  674.         break;

  675.     case 2:

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

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

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

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

  680.                                       tbl_pos + 8, 8))

  681.                         return AVERROR_INVALIDDATA;

  682.                 }

  683.                 dst   += stride * 8;

  684.                 prev1 += stride * 8;

  685.                 prev2 += stride * 8;

  686.             }

  687.         }

  688.         break;

  689.     case 3:

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

  691.         break;

  692.     case 4:

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

  694.         break;

  695.     case 5:

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

  697.             return AVERROR_INVALIDDATA;

  698.         break;

  699.     default:

  700.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  702.         return AVERROR_PATCHWELCOME;

  703.     }

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

  705.         ctx->rotate_code = new_rot;

  706.     else

  707.         ctx->rotate_code = 0;

  708.     ctx->prev_seq = seq;

  709. 

  710.     return 0;

  711. }

  712. 

  713. static int process_frame_obj(SANMVideoContext *ctx)

  714. {

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

  716. 

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

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

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

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

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

  722. 

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

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

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

  726.             return AVERROR_INVALIDDATA;

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

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

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

  730.         if (init_buffers(ctx)) {

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

  732.             return AVERROR(ENOMEM);

  733.         }

  734.     }

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

  736. 

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

  738.     switch (codec) {

  739.     case 1:

  740.     case 3:

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

  742.         break;

  743.     case 37:

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

  745.         break;

  746.     case 47:

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

  748.         break;

  749.     default:

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

  751.         return AVERROR_PATCHWELCOME;

  752.     }

  753. }

  754. 

  755. static int decode_0(SANMVideoContext *ctx)

  756. {

  757.     uint16_t *frm = ctx->frm0;

  758.     int x, y;

  759. 

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

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

  762.         return AVERROR_INVALIDDATA;

  763.     }

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

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

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

  767.         frm += ctx->pitch;

  768.     }

  769.     return 0;

  770. }

  771. 

  772. static int decode_nop(SANMVideoContext *ctx)

  773. {

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

  775.     return AVERROR_PATCHWELCOME;

  776. }

  777. 

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

  779. {

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

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

  782.     int stride = pitch * 2;

  783. 

  784.     switch (block_size) {

  785.     case 2:

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

  787.         break;

  788.     case 4:

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

  790.         break;

  791.     case 8:

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

  793.         break;

  794.     }

  795. }

  796. 

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

  798. {

  799.     int x, y;

  800. 

  801.     pitch -= block_size;

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

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

  804.             *pdest++ = color;

  805. }

  806. 

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

  808.                       uint16_t bg_color, int block_size, int pitch)

  809. {

  810.     int8_t *pglyph;

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

  812.     int x, y;

  813. 

  814.     if (index >= NGLYPHS) {

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

  816.         return AVERROR_INVALIDDATA;

  817.     }

  818. 

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

  820.     pitch -= block_size;

  821. 

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

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

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

  825.     return 0;

  826. }

  827. 

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

  829. {

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

  831. 

  832.     if (block_size == 2) {

  833.         uint32_t indices;

  834. 

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

  836.             return AVERROR_INVALIDDATA;

  837. 

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

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

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

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

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

  843.     } else {

  844.         uint16_t fgcolor, bgcolor;

  845.         int glyph;

  846. 

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

  848.             return AVERROR_INVALIDDATA;

  849. 

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

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

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

  853. 

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

  855.     }

  856.     return 0;

  857. }

  858. 

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

  860. {

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

  862. 

  863.     if (block_size == 2) {

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

  865.             return AVERROR_INVALIDDATA;

  866. 

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

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

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

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

  871.     } else {

  872.         uint16_t fgcolor, bgcolor;

  873.         int glyph;

  874. 

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

  876.             return AVERROR_INVALIDDATA;

  877. 

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

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

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

  881. 

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

  883.     }

  884.     return 0;

  885. }

  886. 

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

  888.                      int block_size)

  889. {

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

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

  892. 

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

  894. 

  895.     if (!good) {

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

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

  898.     }

  899. 

  900.     return good;

  901. }

  902. 

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

  904. {

  905.     int16_t mx, my, index;

  906.     int opcode;

  907. 

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

  909.         return AVERROR_INVALIDDATA;

  910. 

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

  912. 

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

  914.     switch (opcode) {

  915.     default:

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

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

  918. 

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

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

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

  922.                        blk_size, ctx->pitch);

  923.         }

  924.         break;

  925.     case 0xF5:

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

  927.             return AVERROR_INVALIDDATA;

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

  929. 

  930.         mx = index % ctx->width;

  931.         my = index / ctx->width;

  932. 

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

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

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

  936.                        blk_size, ctx->pitch);

  937.         }

  938.         break;

  939.     case 0xF6:

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

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

  942.                    blk_size, ctx->pitch);

  943.         break;

  944.     case 0xF7:

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

  946.         break;

  947. 

  948.     case 0xF8:

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

  950.         break;

  951.     case 0xF9:

  952.     case 0xFA:

  953.     case 0xFB:

  954.     case 0xFC:

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

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

  957.         break;

  958.     case 0xFD:

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

  960.             return AVERROR_INVALIDDATA;

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

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

  963.         break;

  964.     case 0xFE:

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

  966.             return AVERROR_INVALIDDATA;

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

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

  969.         break;

  970.     case 0xFF:

  971.         if (blk_size == 2) {

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

  973.         } else {

  974.             blk_size >>= 1;

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

  976.                 return AVERROR_INVALIDDATA;

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

  978.                 return AVERROR_INVALIDDATA;

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

  980.                 return AVERROR_INVALIDDATA;

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

  982.                 return AVERROR_INVALIDDATA;

  983.         }

  984.         break;

  985.     }

  986.     return 0;

  987. }

  988. 

  989. static int decode_2(SANMVideoContext *ctx)

  990. {

  991.     int cx, cy, ret;

  992. 

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

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

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

  996.                 return ret;

  997.         }

  998.     }

  999. 

  1000.     return 0;

  1001. }

  1002. 

  1003. static int decode_3(SANMVideoContext *ctx)

  1004. {

  1005.     memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);

  1006.     return 0;

  1007. }

  1008. 

  1009. static int decode_4(SANMVideoContext *ctx)

  1010. {

  1011.     memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);

  1012.     return 0;

  1013. }

  1014. 

  1015. static int decode_5(SANMVideoContext *ctx)

  1016. {

  1017. #if HAVE_BIGENDIAN

  1018.     uint16_t *frm;

  1019.     int npixels;

  1020. #endif

  1021.     uint8_t *dst = (uint8_t*)ctx->frm0;

  1022. 

  1023.     if (rle_decode(ctx, dst, ctx->buf_size))

  1024.         return AVERROR_INVALIDDATA;

  1025. 

  1026. #if HAVE_BIGENDIAN

  1027.     npixels = ctx->npixels;

  1028.     frm = ctx->frm0;

  1029.     while (npixels--)

  1030.         *frm++ = av_bswap16(*frm);

  1031. #endif

  1032. 

  1033.     return 0;

  1034. }

  1035. 

  1036. static int decode_6(SANMVideoContext *ctx)

  1037. {

  1038.     int npixels = ctx->npixels;

  1039.     uint16_t *frm = ctx->frm0;

  1040. 

  1041.     if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {

  1042.         av_log(ctx->avctx, AV_LOG_ERROR, "insufficient data for frame\n");

  1043.         return AVERROR_INVALIDDATA;

  1044.     }

  1045.     while (npixels--)

  1046.         *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1047. 

  1048.     return 0;

  1049. }

  1050. 

  1051. static int decode_8(SANMVideoContext *ctx)

  1052. {

  1053.     uint16_t *pdest = ctx->frm0;

  1054.     uint8_t *rsrc;

  1055.     long npixels = ctx->npixels;

  1056. 

  1057.     av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);

  1058.     if (!ctx->rle_buf) {

  1059.         av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed\n");

  1060.         return AVERROR(ENOMEM);

  1061.     }

  1062.     rsrc = ctx->rle_buf;

  1063. 

  1064.     if (rle_decode(ctx, rsrc, npixels))

  1065.         return AVERROR_INVALIDDATA;

  1066. 

  1067.     while (npixels--)

  1068.         *pdest++ = ctx->codebook[*rsrc++];

  1069. 

  1070.     return 0;

  1071. }

  1072. 

  1073. typedef int (*frm_decoder)(SANMVideoContext *ctx);

  1074. 

  1075. static const frm_decoder v1_decoders[] = {

  1076.     decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,

  1077.     decode_6, decode_nop, decode_8

  1078. };

  1079. 

  1080. static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1081. {

  1082.     int i, ret;

  1083. 

  1084.     if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {

  1085.         av_log(ctx->avctx, AV_LOG_ERROR, "too short input frame (%d bytes)\n",

  1086.                ret);

  1087.         return AVERROR_INVALIDDATA;

  1088.     }

  1089.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1090. 

  1091.     hdr->width  = bytestream2_get_le32u(&ctx->gb);

  1092.     hdr->height = bytestream2_get_le32u(&ctx->gb);

  1093. 

  1094.     if (hdr->width != ctx->width || hdr->height != ctx->height) {

  1095.         av_log(ctx->avctx, AV_LOG_ERROR, "variable size frames are not implemented\n");

  1096.         return AVERROR_PATCHWELCOME;

  1097.     }

  1098. 

  1099.     hdr->seq_num     = bytestream2_get_le16u(&ctx->gb);

  1100.     hdr->codec       = bytestream2_get_byteu(&ctx->gb);

  1101.     hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);

  1102. 

  1103.     bytestream2_skip(&ctx->gb, 4); // skip pad

  1104. 

  1105.     for (i = 0; i < 4; i++)

  1106.         ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1107.     hdr->bg_color = bytestream2_get_le16u(&ctx->gb);

  1108. 

  1109.     bytestream2_skip(&ctx->gb, 2); // skip pad

  1110. 

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

  1112.     for (i = 0; i < 256; i++)

  1113.         ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1114. 

  1115.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1116. 

  1117.     av_dlog(ctx->avctx, "subcodec %d\n", hdr->codec);

  1118.     return 0;

  1119. }

  1120. 

  1121. static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)

  1122. {

  1123.     while (buf_size--)

  1124.         *pbuf++ = color;

  1125. }

  1126. 

  1127. static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1128. {

  1129.     uint8_t *dst;

  1130.     const uint8_t *src = (uint8_t*) ctx->frm0;

  1131.     int ret, dstpitch, height = ctx->height;

  1132.     int srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);

  1133. 

  1134.     if ((ret = ff_get_buffer(ctx->avctx, ctx->output)) < 0) {

  1135.         av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1136.         return ret;

  1137.     }

  1138. 

  1139.     dst      = ctx->output->data[0];

  1140.     dstpitch = ctx->output->linesize[0];

  1141. 

  1142.     while (height--) {

  1143.         memcpy(dst, src, srcpitch);

  1144.         src += srcpitch;

  1145.         dst += dstpitch;

  1146.     }

  1147. 

  1148.     return 0;

  1149. }

  1150. 

  1151. static int decode_frame(AVCodecContext *avctx, void *data,

  1152.                         int *got_frame_ptr, AVPacket *pkt)

  1153. {

  1154.     SANMVideoContext *ctx = avctx->priv_data;

  1155.     int i, ret;

  1156. 

  1157.     bytestream2_init(&ctx->gb, pkt->data, pkt->size);

  1158.     if (ctx->output->data[0])

  1159.         avctx->release_buffer(avctx, ctx->output);

  1160. 

  1161.     if (!ctx->version) {

  1162.         int to_store = 0;

  1163. 

  1164.         while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {

  1165.             uint32_t sig, size;

  1166.             int pos;

  1167. 

  1168.             sig  = bytestream2_get_be32u(&ctx->gb);

  1169.             size = bytestream2_get_be32u(&ctx->gb);

  1170.             pos  = bytestream2_tell(&ctx->gb);

  1171. 

  1172.             if (bytestream2_get_bytes_left(&ctx->gb) < size) {

  1173.                 av_log(avctx, AV_LOG_ERROR, "incorrect chunk size %d\n", size);

  1174.                 break;

  1175.             }

  1176.             switch (sig) {

  1177.             case MKBETAG('N', 'P', 'A', 'L'):

  1178.                 if (size != 256 * 3) {

  1179.                     av_log(avctx, AV_LOG_ERROR, "incorrect palette block size %d\n",

  1180.                            size);

  1181.                     return AVERROR_INVALIDDATA;

  1182.                 }

  1183.                 for (i = 0; i < 256; i++)

  1184.                     ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1185.                 break;

  1186.             case MKBETAG('F', 'O', 'B', 'J'):

  1187.                 if (size < 16)

  1188.                     return AVERROR_INVALIDDATA;

  1189.                 if (ret = process_frame_obj(ctx))

  1190.                     return ret;

  1191.                 break;

  1192.             case MKBETAG('X', 'P', 'A', 'L'):

  1193.                 if (size == 6 || size == 4) {

  1194.                     uint8_t tmp[3];

  1195.                     int j;

  1196. 

  1197.                     for (i = 0; i < 256; i++) {

  1198.                         for (j = 0; j < 3; j++) {

  1199.                             int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;

  1200.                             tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);

  1201.                         }

  1202.                         ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);

  1203.                     }

  1204.                 } else {

  1205.                     if (size < 768 * 2 + 4) {

  1206.                         av_log(avctx, AV_LOG_ERROR, "incorrect palette change block size %d\n",

  1207.                                size);

  1208.                         return AVERROR_INVALIDDATA;

  1209.                     }

  1210.                     bytestream2_skipu(&ctx->gb, 4);

  1211.                     for (i = 0; i < 768; i++)

  1212.                         ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);

  1213.                     if (size >= 768 * 5 + 4) {

  1214.                         for (i = 0; i < 256; i++)

  1215.                             ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1216.                     } else {

  1217.                         memset(ctx->pal, 0, sizeof(ctx->pal));

  1218.                     }

  1219.                 }

  1220.                 break;

  1221.             case MKBETAG('S', 'T', 'O', 'R'):

  1222.                 to_store = 1;

  1223.                 break;

  1224.             case MKBETAG('F', 'T', 'C', 'H'):

  1225.                 memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);

  1226.                 break;

  1227.             default:

  1228.                 bytestream2_skip(&ctx->gb, size);

  1229.                 av_log(avctx, AV_LOG_DEBUG, "unknown/unsupported chunk %x\n", sig);

  1230.                 break;

  1231.             }

  1232. 

  1233.             bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);

  1234.             if (size & 1)

  1235.                 bytestream2_skip(&ctx->gb, 1);

  1236.         }

  1237.         if (to_store)

  1238.             memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);

  1239.         if ((ret = copy_output(ctx, NULL)))

  1240.             return ret;

  1241.         memcpy(ctx->output->data[1], ctx->pal, 1024);

  1242.     } else {

  1243.         SANMFrameHeader header;

  1244. 

  1245.         if ((ret = read_frame_header(ctx, &header)))

  1246.             return ret;

  1247. 

  1248.         ctx->rotate_code = header.rotate_code;

  1249.         if ((ctx->output->key_frame = !header.seq_num)) {

  1250.             ctx->output->pict_type = AV_PICTURE_TYPE_I;

  1251.             fill_frame(ctx->frm1, ctx->npixels, header.bg_color);

  1252.             fill_frame(ctx->frm2, ctx->npixels, header.bg_color);

  1253.         } else {

  1254.             ctx->output->pict_type = AV_PICTURE_TYPE_P;

  1255.         }

  1256. 

  1257.         if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {

  1258.             if ((ret = v1_decoders[header.codec](ctx))) {

  1259.                 av_log(avctx, AV_LOG_ERROR,

  1260.                        "subcodec %d: error decoding frame\n", header.codec);

  1261.                 return ret;

  1262.             }

  1263.         } else {

  1264.             av_log_ask_for_sample(avctx, "subcodec %d is not implemented\n",

  1265.                    header.codec);

  1266.             return AVERROR_PATCHWELCOME;

  1267.         }

  1268. 

  1269.         if ((ret = copy_output(ctx, &header)))

  1270.             return ret;

  1271.     }

  1272.     if (ctx->rotate_code)

  1273.         rotate_bufs(ctx, ctx->rotate_code);

  1274. 

  1275.     *got_frame_ptr  = 1;

  1276.     *(AVFrame*)data = *ctx->output;

  1277. 

  1278.     return pkt->size;

  1279. }

  1280. 

  1281. AVCodec ff_sanm_decoder = {

  1282.     .name           = "sanm",

  1283.     .type           = AVMEDIA_TYPE_VIDEO,

  1284.     .id             = AV_CODEC_ID_SANM,

  1285.     .priv_data_size = sizeof(SANMVideoContext),

  1286.     .init           = decode_init,

  1287.     .close          = decode_end,

  1288.     .decode         = decode_frame,

  1289.     .capabilities   = CODEC_CAP_DR1,

  1290.     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts SMUSH video"),

  1291. };