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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 "libavcodec/dsputil.h"

  30. #include "sanm_data.h"

  31. 

  32. #define NGLYPHS 256

  33. 

  34. typedef struct {

  35.     AVCodecContext *avctx;

  36.     GetByteContext gb;

  37. 

  38.     int version, subversion;

  39.     uint32_t pal[256];

  40.     int16_t delta_pal[768];

  41. 

  42.     int pitch;

  43.     int width, height;

  44.     int aligned_width, aligned_height;

  45.     int prev_seq;

  46. 

  47.     AVFrame frame, *output;

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

  49.     uint8_t *stored_frame;

  50.     uint32_t frm0_size, frm1_size, frm2_size;

  51.     uint32_t stored_frame_size;

  52. 

  53.     uint8_t *rle_buf;

  54.     unsigned int rle_buf_size;

  55. 

  56.     int rotate_code;

  57. 

  58.     long npixels, buf_size;

  59. 

  60.     uint16_t codebook[256];

  61.     uint16_t small_codebook[4];

  62. 

  63.     int8_t p4x4glyphs[NGLYPHS][16];

  64.     int8_t p8x8glyphs[NGLYPHS][64];

  65. } SANMVideoContext;

  66. 

  67. typedef struct {

  68.     int seq_num, codec, rotate_code, rle_output_size;

  69. 

  70.     uint16_t bg_color;

  71.     uint32_t width, height;

  72. } SANMFrameHeader;

  73. 

  74. enum GlyphEdge {

  75.     LEFT_EDGE,

  76.     TOP_EDGE,

  77.     RIGHT_EDGE,

  78.     BOTTOM_EDGE,

  79.     NO_EDGE

  80. };

  81. 

  82. enum GlyphDir {

  83.     DIR_LEFT,

  84.     DIR_UP,

  85.     DIR_RIGHT,

  86.     DIR_DOWN,

  87.     NO_DIR

  88. };

  89. 

  90. /**

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

  92.  *

  93.  * @param x x point coordinate

  94.  * @param y y point coordinate

  95.  * @param edge_size box width/height.

  96.  */

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

  98. {

  99.     const int edge_max = edge_size - 1;

  100. 

  101.     if (!y) {

  102.         return BOTTOM_EDGE;

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

  104.         return TOP_EDGE;

  105.     } else if (!x) {

  106.         return LEFT_EDGE;

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

  108.         return RIGHT_EDGE;

  109.     } else {

  110.         return NO_EDGE;

  111.     }

  112. }

  113. 

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

  115. {

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

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

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

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

  120.         return DIR_UP;

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

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

  123.         return DIR_DOWN;

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

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

  126.         return DIR_LEFT;

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

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

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

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

  131.         return DIR_RIGHT;

  132.     }

  133. 

  134.     return NO_DIR;

  135. }

  136. 

  137. /**

  138.  * Interpolate two points.

  139.  */

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

  141.                          int pos, int npoints)

  142. {

  143.     if (npoints) {

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

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

  146.     } else {

  147.         points[0] = x0;

  148.         points[1] = y0;

  149.     }

  150. }

  151. 

  152. /**

  153.  * Construct glyphs by iterating through vectors coordinates.

  154.  *

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

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

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

  158.  * @param side_length glyph width/height.

  159.  */

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

  161.                         const int side_length)

  162. {

  163.     const int glyph_size = side_length * side_length;

  164.     int8_t *pglyph = pglyphs;

  165. 

  166.     int i, j;

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

  168.         int x0    = xvec[i];

  169.         int y0    = yvec[i];

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

  171. 

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

  173.             int x1      = xvec[j];

  174.             int y1      = yvec[j];

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

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

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

  178.             int ipoint;

  179. 

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

  181.                 int8_t point[2];

  182.                 int irow, icol;

  183. 

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

  185. 

  186.                 switch (dir) {

  187.                 case DIR_UP:

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

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

  190.                     break;

  191. 

  192.                 case DIR_DOWN:

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

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

  195.                     break;

  196. 

  197.                 case DIR_LEFT:

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

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

  200.                     break;

  201. 

  202.                 case DIR_RIGHT:

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

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

  205.                     break;

  206.                 }

  207.             }

  208.         }

  209.     }

  210. }

  211. 

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

  213. {

  214.     ctx->width   = width;

  215.     ctx->height  = height;

  216.     ctx->npixels = width * height;

  217. 

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

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

  220. 

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

  222.     ctx->pitch    = width;

  223. }

  224. 

  225. static void destroy_buffers(SANMVideoContext *ctx)

  226. {

  227.     av_freep(&ctx->frm0);

  228.     av_freep(&ctx->frm1);

  229.     av_freep(&ctx->frm2);

  230.     av_freep(&ctx->stored_frame);

  231.     av_freep(&ctx->rle_buf);

  232. }

  233. 

  234. static av_cold int init_buffers(SANMVideoContext *ctx)

  235. {

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

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

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

  239.     if (!ctx->version)

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

  241. 

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

  243.         destroy_buffers(ctx);

  244.         return AVERROR(ENOMEM);

  245.     }

  246. 

  247.     return 0;

  248. }

  249. 

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

  251. {

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

  253.     if (rotate_code == 2)

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

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

  256. }

  257. 

  258. static av_cold int decode_init(AVCodecContext *avctx)

  259. {

  260.     SANMVideoContext *ctx = avctx->priv_data;

  261. 

  262.     ctx->avctx     = avctx;

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

  264. 

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

  266. 

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

  268.     if (init_buffers(ctx)) {

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

  270.         return AVERROR(ENOMEM);

  271.     }

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

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

  274. 

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

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

  277. 

  278.     if (!ctx->version) {

  279.         int i;

  280. 

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

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

  283.             return AVERROR_INVALIDDATA;

  284.         }

  285. 

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

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

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

  289.     }

  290. 

  291.     return 0;

  292. }

  293. 

  294. static av_cold int decode_end(AVCodecContext *avctx)

  295. {

  296.     SANMVideoContext *ctx = avctx->priv_data;

  297. 

  298.     destroy_buffers(ctx);

  299. 

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

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

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

  303.     }

  304. 

  305.     return 0;

  306. }

  307. 

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

  309. {

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

  311. 

  312.     while (left > 0) {

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

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

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

  316.             return AVERROR_INVALIDDATA;

  317. 

  318.         if (opcode & 1) {

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

  320.             memset(dst, color, run_len);

  321.         } else {

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

  323.                 return AVERROR_INVALIDDATA;

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

  325.         }

  326. 

  327.         dst  += run_len;

  328.         left -= run_len;

  329.     }

  330. 

  331.     return 0;

  332. }

  333. 

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

  335.                       int left, int width, int height)

  336. {

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

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

  339. 

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

  341.         pos = 0;

  342. 

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

  344.             return AVERROR_INVALIDDATA;

  345. 

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

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

  348. 

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

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

  351.                 return AVERROR_INVALIDDATA;

  352. 

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

  354.             flag = code & 1;

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

  356.             if (pos + code > width)

  357.                 return AVERROR_INVALIDDATA;

  358.             if (flag) {

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

  360.                 if (val)

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

  362.                 pos += code;

  363.             } else {

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

  365.                     return AVERROR_INVALIDDATA;

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

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

  368.                     if (val)

  369.                         dst[pos] = val;

  370.                     pos++;

  371.                 }

  372.             }

  373.         }

  374.         dst += ctx->pitch;

  375.     }

  376.     ctx->rotate_code = 0;

  377. 

  378.     return 0;

  379. }

  380. 

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

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

  383. {

  384.     int pos, i, j;

  385. 

  386.     pos = x + y * stride;

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

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

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

  390.                 dst[i] = 0;

  391.             else

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

  393.         }

  394.         dst += stride;

  395.         src += stride;

  396.         pos += stride;

  397.     }

  398. }

  399. 

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

  401.                        int left, int width, int height)

  402. {

  403.     int stride = ctx->pitch;

  404.     int i, j, k, t;

  405.     int skip_run = 0;

  406.     int compr, mvoff, seq, flags;

  407.     uint32_t decoded_size;

  408.     uint8_t *dst, *prev;

  409. 

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

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

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

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

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

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

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

  417. 

  418.     ctx->rotate_code = 0;

  419. 

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

  421.         rotate_bufs(ctx, 1);

  422. 

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

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

  425. 

  426.     if (mvoff > 2) {

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

  428.         return AVERROR_INVALIDDATA;

  429.     }

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

  431.     switch (compr) {

  432.     case 0:

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

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

  435.             dst += stride;

  436.         }

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

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

  439.         break;

  440.     case 2:

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

  442.             return AVERROR_INVALIDDATA;

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

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

  445.         break;

  446.     case 3:

  447.     case 4:

  448.         if (flags & 4) {

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

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

  451.                     int code;

  452.                     if (skip_run) {

  453.                         skip_run--;

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

  455.                         continue;

  456.                     }

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

  458.                         return AVERROR_INVALIDDATA;

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

  460.                     switch (code) {

  461.                     case 0xFF:

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

  463.                             return AVERROR_INVALIDDATA;

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

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

  466.                         break;

  467.                     case 0xFE:

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

  469.                             return AVERROR_INVALIDDATA;

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

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

  472.                         break;

  473.                     case 0xFD:

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

  475.                             return AVERROR_INVALIDDATA;

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

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

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

  479.                         break;

  480.                     default:

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

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

  483.                                 return AVERROR_INVALIDDATA;

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

  485.                             i -= 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.                         copy_block4(dst + i, prev + i, stride, stride, 4);

  506.                         continue;

  507.                     }

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

  509.                     if (code == 0xFF) {

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

  511.                             return AVERROR_INVALIDDATA;

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

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

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

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

  516.                             return AVERROR_INVALIDDATA;

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

  518.                         i -= 4;

  519.                     } else {

  520.                         int mx, my;

  521. 

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

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

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

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

  526.                     }

  527.                 }

  528.                 dst  += stride * 4;

  529.                 prev += stride * 4;

  530.             }

  531.         }

  532.         break;

  533.     default:

  534.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  536.         return AVERROR_PATCHWELCOME;

  537.     }

  538. 

  539.     return 0;

  540. }

  541. 

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

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

  544. {

  545.     int code, k, t;

  546.     uint8_t colors[2];

  547.     int8_t *pglyph;

  548. 

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

  550.         return AVERROR_INVALIDDATA;

  551. 

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

  553.     if (code >= 0xF8) {

  554.         switch (code) {

  555.         case 0xFF:

  556.             if (size == 2) {

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

  558.                     return AVERROR_INVALIDDATA;

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

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

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

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

  563.             } else {

  564.                 size >>= 1;

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

  566.                     return AVERROR_INVALIDDATA;

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

  568.                                   stride, tbl, size))

  569.                     return AVERROR_INVALIDDATA;

  570.                 dst   += size * stride;

  571.                 prev1 += size * stride;

  572.                 prev2 += size * stride;

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

  574.                     return AVERROR_INVALIDDATA;

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

  576.                                   stride, tbl, size))

  577.                     return AVERROR_INVALIDDATA;

  578.             }

  579.             break;

  580.         case 0xFE:

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

  582.                 return AVERROR_INVALIDDATA;

  583. 

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

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

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

  587.             break;

  588.         case 0xFD:

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

  590.                 return AVERROR_INVALIDDATA;

  591. 

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

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

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

  595. 

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

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

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

  599.             break;

  600.         case 0xFC:

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

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

  603.             break;

  604.         default:

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

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

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

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

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

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

  611.         }

  612.     } else {

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

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

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

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

  617.     }

  618. 

  619.     return 0;

  620. }

  621. 

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

  623.                        int left, int width, int height)

  624. {

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

  626.     int stride     = ctx->pitch;

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

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

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

  630.     uint32_t decoded_size;

  631. 

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

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

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

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

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

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

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

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

  640. 

  641.     if (skip & 1)

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

  643.     if (!seq) {

  644.         ctx->prev_seq = -1;

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

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

  647.     }

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

  649.     switch (compr) {

  650.     case 0:

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

  652.             return AVERROR_INVALIDDATA;

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

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

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

  656.             dst += stride;

  657.         }

  658.         break;

  659.     case 1:

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

  661.             return AVERROR_INVALIDDATA;

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

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

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

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

  666.             }

  667.             dst += stride * 2;

  668.         }

  669.         break;

  670.     case 2:

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

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

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

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

  675.                                       tbl_pos + 8, 8))

  676.                         return AVERROR_INVALIDDATA;

  677.                 }

  678.                 dst   += stride * 8;

  679.                 prev1 += stride * 8;

  680.                 prev2 += stride * 8;

  681.             }

  682.         }

  683.         break;

  684.     case 3:

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

  686.         break;

  687.     case 4:

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

  689.         break;

  690.     case 5:

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

  692.             return AVERROR_INVALIDDATA;

  693.         break;

  694.     default:

  695.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  697.         return AVERROR_PATCHWELCOME;

  698.     }

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

  700.         ctx->rotate_code = new_rot;

  701.     else

  702.         ctx->rotate_code = 0;

  703.     ctx->prev_seq = seq;

  704. 

  705.     return 0;

  706. }

  707. 

  708. static int process_frame_obj(SANMVideoContext *ctx)

  709. {

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

  711. 

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

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

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

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

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

  717. 

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

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

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

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

  722.         if (init_buffers(ctx)) {

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

  724.             return AVERROR(ENOMEM);

  725.         }

  726.     }

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

  728. 

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

  730.     switch (codec) {

  731.     case 1:

  732.     case 3:

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

  734.         break;

  735.     case 37:

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

  737.         break;

  738.     case 47:

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

  740.         break;

  741.     default:

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

  743.         return AVERROR_PATCHWELCOME;

  744.     }

  745. }

  746. 

  747. static int decode_0(SANMVideoContext *ctx)

  748. {

  749.     uint16_t *frm = ctx->frm0;

  750.     int x, y;

  751. 

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

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

  754.         return AVERROR_INVALIDDATA;

  755.     }

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

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

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

  759.         frm += ctx->pitch;

  760.     }

  761.     return 0;

  762. }

  763. 

  764. static int decode_nop(SANMVideoContext *ctx)

  765. {

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

  767.     return AVERROR_PATCHWELCOME;

  768. }

  769. 

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

  771. {

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

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

  774.     int stride = pitch * 2;

  775. 

  776.     switch (block_size) {

  777.     case 2:

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

  779.         break;

  780.     case 4:

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

  782.         break;

  783.     case 8:

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

  785.         break;

  786.     }

  787. }

  788. 

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

  790. {

  791.     int x, y;

  792. 

  793.     pitch -= block_size;

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

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

  796.             *pdest++ = color;

  797. }

  798. 

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

  800.                       uint16_t bg_color, int block_size, int pitch)

  801. {

  802.     int8_t *pglyph;

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

  804.     int x, y;

  805. 

  806.     if (index >= NGLYPHS) {

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

  808.         return AVERROR_INVALIDDATA;

  809.     }

  810. 

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

  812.     pitch -= block_size;

  813. 

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

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

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

  817.     return 0;

  818. }

  819. 

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

  821. {

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

  823. 

  824.     if (block_size == 2) {

  825.         uint32_t indices;

  826. 

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

  828.             return AVERROR_INVALIDDATA;

  829. 

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

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

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

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

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

  835.     } else {

  836.         uint16_t fgcolor, bgcolor;

  837.         int glyph;

  838. 

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

  840.             return AVERROR_INVALIDDATA;

  841. 

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

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

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

  845. 

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

  847.     }

  848.     return 0;

  849. }

  850. 

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

  852. {

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

  854. 

  855.     if (block_size == 2) {

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

  857.             return AVERROR_INVALIDDATA;

  858. 

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

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

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

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

  863.     } else {

  864.         uint16_t fgcolor, bgcolor;

  865.         int glyph;

  866. 

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

  868.             return AVERROR_INVALIDDATA;

  869. 

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

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

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

  873. 

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

  875.     }

  876.     return 0;

  877. }

  878. 

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

  880.                      int block_size)

  881. {

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

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

  884. 

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

  886. 

  887.     if (!good) {

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

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

  890.     }

  891. 

  892.     return good;

  893. }

  894. 

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

  896. {

  897.     int16_t mx, my, index;

  898.     int opcode;

  899. 

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

  901.         return AVERROR_INVALIDDATA;

  902. 

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

  904. 

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

  906.     switch (opcode) {

  907.     default:

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

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

  910. 

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

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

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

  914.                        blk_size, ctx->pitch);

  915.         }

  916.         break;

  917.     case 0xF5:

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

  919.             return AVERROR_INVALIDDATA;

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

  921. 

  922.         mx = index % ctx->width;

  923.         my = index / ctx->width;

  924. 

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

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

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

  928.                        blk_size, ctx->pitch);

  929.         }

  930.         break;

  931.     case 0xF6:

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

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

  934.                    blk_size, ctx->pitch);

  935.         break;

  936.     case 0xF7:

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

  938.         break;

  939. 

  940.     case 0xF8:

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

  942.         break;

  943.     case 0xF9:

  944.     case 0xFA:

  945.     case 0xFB:

  946.     case 0xFC:

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

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

  949.         break;

  950.     case 0xFD:

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

  952.             return AVERROR_INVALIDDATA;

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

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

  955.         break;

  956.     case 0xFE:

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

  958.             return AVERROR_INVALIDDATA;

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

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

  961.         break;

  962.     case 0xFF:

  963.         if (blk_size == 2) {

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

  965.         } else {

  966.             blk_size >>= 1;

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

  968.                 return AVERROR_INVALIDDATA;

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

  970.                 return AVERROR_INVALIDDATA;

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

  972.                 return AVERROR_INVALIDDATA;

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

  974.                 return AVERROR_INVALIDDATA;

  975.         }

  976.         break;

  977.     }

  978.     return 0;

  979. }

  980. 

  981. static int decode_2(SANMVideoContext *ctx)

  982. {

  983.     int cx, cy, ret;

  984. 

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

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

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

  988.                 return ret;

  989.         }

  990.     }

  991. 

  992.     return 0;

  993. }

  994. 

  995. static int decode_3(SANMVideoContext *ctx)

  996. {

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

  998.     return 0;

  999. }

  1000. 

  1001. static int decode_4(SANMVideoContext *ctx)

  1002. {

  1003.     memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);

  1004.     return 0;

  1005. }

  1006. 

  1007. static int decode_5(SANMVideoContext *ctx)

  1008. {

  1009. #if HAVE_BIGENDIAN

  1010.     uint16_t *frm;

  1011.     int npixels;

  1012. #endif

  1013.     uint8_t *dst = (uint8_t*)ctx->frm0;

  1014. 

  1015.     if (rle_decode(ctx, dst, ctx->buf_size))

  1016.         return AVERROR_INVALIDDATA;

  1017. 

  1018. #if HAVE_BIGENDIAN

  1019.     npixels = ctx->npixels;

  1020.     frm = ctx->frm0;

  1021.     while (npixels--)

  1022.         *frm++ = av_bswap16(*frm);

  1023. #endif

  1024. 

  1025.     return 0;

  1026. }

  1027. 

  1028. static int decode_6(SANMVideoContext *ctx)

  1029. {

  1030.     int npixels = ctx->npixels;

  1031.     uint16_t *frm = ctx->frm0;

  1032. 

  1033.     if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {

  1034.         av_log(ctx->avctx, AV_LOG_ERROR, "insufficient data for frame\n");

  1035.         return AVERROR_INVALIDDATA;

  1036.     }

  1037.     while (npixels--)

  1038.         *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1039. 

  1040.     return 0;

  1041. }

  1042. 

  1043. static int decode_8(SANMVideoContext *ctx)

  1044. {

  1045.     uint16_t *pdest = ctx->frm0;

  1046.     uint8_t *rsrc;

  1047.     long npixels = ctx->npixels;

  1048. 

  1049.     av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);

  1050.     if (!ctx->rle_buf) {

  1051.         av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed\n");

  1052.         return AVERROR(ENOMEM);

  1053.     }

  1054.     rsrc = ctx->rle_buf;

  1055. 

  1056.     if (rle_decode(ctx, rsrc, npixels))

  1057.         return AVERROR_INVALIDDATA;

  1058. 

  1059.     while (npixels--)

  1060.         *pdest++ = ctx->codebook[*rsrc++];

  1061. 

  1062.     return 0;

  1063. }

  1064. 

  1065. typedef int (*frm_decoder)(SANMVideoContext *ctx);

  1066. 

  1067. static const frm_decoder v1_decoders[] = {

  1068.     decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,

  1069.     decode_6, decode_nop, decode_8

  1070. };

  1071. 

  1072. static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1073. {

  1074.     int i, ret;

  1075. 

  1076.     if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {

  1077.         av_log(ctx->avctx, AV_LOG_ERROR, "too short input frame (%d bytes)\n",

  1078.                ret);

  1079.         return AVERROR_INVALIDDATA;

  1080.     }

  1081.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1082. 

  1083.     hdr->width  = bytestream2_get_le32u(&ctx->gb);

  1084.     hdr->height = bytestream2_get_le32u(&ctx->gb);

  1085. 

  1086.     if (hdr->width != ctx->width || hdr->height != ctx->height) {

  1087.         av_log(ctx->avctx, AV_LOG_ERROR, "variable size frames are not implemented\n");

  1088.         return AVERROR_PATCHWELCOME;

  1089.     }

  1090. 

  1091.     hdr->seq_num     = bytestream2_get_le16u(&ctx->gb);

  1092.     hdr->codec       = bytestream2_get_byteu(&ctx->gb);

  1093.     hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);

  1094. 

  1095.     bytestream2_skip(&ctx->gb, 4); // skip pad

  1096. 

  1097.     for (i = 0; i < 4; i++)

  1098.         ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);

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

  1100. 

  1101.     bytestream2_skip(&ctx->gb, 2); // skip pad

  1102. 

  1103.     hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);

  1104.     for (i = 0; i < 256; i++)

  1105.         ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1106. 

  1107.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1108. 

  1109.     av_dlog(ctx->avctx, "subcodec %d\n", hdr->codec);

  1110.     return 0;

  1111. }

  1112. 

  1113. static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)

  1114. {

  1115.     while (buf_size--)

  1116.         *pbuf++ = color;

  1117. }

  1118. 

  1119. static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1120. {

  1121.     uint8_t *dst;

  1122.     const uint8_t *src = (uint8_t*) ctx->frm0;

  1123.     int ret, dstpitch, height = ctx->height;

  1124.     int srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);

  1125. 

  1126.     if ((ret = ff_get_buffer(ctx->avctx, ctx->output)) < 0) {

  1127.         av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1128.         return ret;

  1129.     }

  1130. 

  1131.     dst      = ctx->output->data[0];

  1132.     dstpitch = ctx->output->linesize[0];

  1133. 

  1134.     while (height--) {

  1135.         memcpy(dst, src, srcpitch);

  1136.         src += srcpitch;

  1137.         dst += dstpitch;

  1138.     }

  1139. 

  1140.     return 0;

  1141. }

  1142. 

  1143. static int decode_frame(AVCodecContext *avctx, void *data,

  1144.                         int *got_frame_ptr, AVPacket *pkt)

  1145. {

  1146.     SANMVideoContext *ctx = avctx->priv_data;

  1147.     int i, ret;

  1148. 

  1149.     bytestream2_init(&ctx->gb, pkt->data, pkt->size);

  1150.     if (ctx->output->data[0])

  1151.         avctx->release_buffer(avctx, ctx->output);

  1152. 

  1153.     if (!ctx->version) {

  1154.         int to_store = 0;

  1155. 

  1156.         while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {

  1157.             uint32_t sig, size;

  1158.             int pos;

  1159. 

  1160.             sig  = bytestream2_get_be32u(&ctx->gb);

  1161.             size = bytestream2_get_be32u(&ctx->gb);

  1162.             pos  = bytestream2_tell(&ctx->gb);

  1163. 

  1164.             if (bytestream2_get_bytes_left(&ctx->gb) < size) {

  1165.                 av_log(avctx, AV_LOG_ERROR, "incorrect chunk size %d\n", size);

  1166.                 break;

  1167.             }

  1168.             switch (sig) {

  1169.             case MKBETAG('N', 'P', 'A', 'L'):

  1170.                 if (size != 256 * 3) {

  1171.                     av_log(avctx, AV_LOG_ERROR, "incorrect palette block size %d\n",

  1172.                            size);

  1173.                     return AVERROR_INVALIDDATA;

  1174.                 }

  1175.                 for (i = 0; i < 256; i++)

  1176.                     ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1177.                 break;

  1178.             case MKBETAG('F', 'O', 'B', 'J'):

  1179.                 if (size < 16)

  1180.                     return AVERROR_INVALIDDATA;

  1181.                 if (ret = process_frame_obj(ctx))

  1182.                     return ret;

  1183.                 break;

  1184.             case MKBETAG('X', 'P', 'A', 'L'):

  1185.                 if (size == 6 || size == 4) {

  1186.                     uint8_t tmp[3];

  1187.                     int j;

  1188. 

  1189.                     for (i = 0; i < 256; i++) {

  1190.                         for (j = 0; j < 3; j++) {

  1191.                             int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;

  1192.                             tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);

  1193.                         }

  1194.                         ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);

  1195.                     }

  1196.                 } else {

  1197.                     if (size < 768 * 2 + 4) {

  1198.                         av_log(avctx, AV_LOG_ERROR, "incorrect palette change block size %d\n",

  1199.                                size);

  1200.                         return AVERROR_INVALIDDATA;

  1201.                     }

  1202.                     bytestream2_skipu(&ctx->gb, 4);

  1203.                     for (i = 0; i < 768; i++)

  1204.                         ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);

  1205.                     if (size >= 768 * 5 + 4) {

  1206.                         for (i = 0; i < 256; i++)

  1207.                             ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1208.                     } else {

  1209.                         memset(ctx->pal, 0, sizeof(ctx->pal));

  1210.                     }

  1211.                 }

  1212.                 break;

  1213.             case MKBETAG('S', 'T', 'O', 'R'):

  1214.                 to_store = 1;

  1215.                 break;

  1216.             case MKBETAG('F', 'T', 'C', 'H'):

  1217.                 memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);

  1218.                 break;

  1219.             default:

  1220.                 bytestream2_skip(&ctx->gb, size);

  1221.                 av_log(avctx, AV_LOG_DEBUG, "unknown/unsupported chunk %x\n", sig);

  1222.                 break;

  1223.             }

  1224. 

  1225.             bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);

  1226.             if (size & 1)

  1227.                 bytestream2_skip(&ctx->gb, 1);

  1228.         }

  1229.         if (to_store)

  1230.             memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);

  1231.         if ((ret = copy_output(ctx, NULL)))

  1232.             return ret;

  1233.         memcpy(ctx->output->data[1], ctx->pal, 1024);

  1234.     } else {

  1235.         SANMFrameHeader header;

  1236. 

  1237.         if ((ret = read_frame_header(ctx, &header)))

  1238.             return ret;

  1239. 

  1240.         ctx->rotate_code = header.rotate_code;

  1241.         if ((ctx->output->key_frame = !header.seq_num)) {

  1242.             ctx->output->pict_type = AV_PICTURE_TYPE_I;

  1243.             fill_frame(ctx->frm1, ctx->npixels, header.bg_color);

  1244.             fill_frame(ctx->frm2, ctx->npixels, header.bg_color);

  1245.         } else {

  1246.             ctx->output->pict_type = AV_PICTURE_TYPE_P;

  1247.         }

  1248. 

  1249.         if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {

  1250.             if ((ret = v1_decoders[header.codec](ctx))) {

  1251.                 av_log(avctx, AV_LOG_ERROR,

  1252.                        "subcodec %d: error decoding frame\n", header.codec);

  1253.                 return ret;

  1254.             }

  1255.         } else {

  1256.             av_log_ask_for_sample(avctx, "subcodec %d is not implemented\n",

  1257.                    header.codec);

  1258.             return AVERROR_PATCHWELCOME;

  1259.         }

  1260. 

  1261.         if ((ret = copy_output(ctx, &header)))

  1262.             return ret;

  1263.     }

  1264.     if (ctx->rotate_code)

  1265.         rotate_bufs(ctx, ctx->rotate_code);

  1266. 

  1267.     *got_frame_ptr  = 1;

  1268.     *(AVFrame*)data = *ctx->output;

  1269. 

  1270.     return pkt->size;

  1271. }

  1272. 

  1273. AVCodec ff_sanm_decoder = {

  1274.     .name           = "sanm",

  1275.     .type           = AVMEDIA_TYPE_VIDEO,

  1276.     .id             = AV_CODEC_ID_SANM,

  1277.     .priv_data_size = sizeof(SANMVideoContext),

  1278.     .init           = decode_init,

  1279.     .close          = decode_end,

  1280.     .decode         = decode_frame,

  1281.     .capabilities   = CODEC_CAP_DR1,

  1282.     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts SMUSH video"),

  1283. };