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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. #include "libavutil/avassert.h"

  33. 

  34. #define NGLYPHS 256

  35. 

  36. typedef struct {

  37.     AVCodecContext *avctx;

  38.     GetByteContext gb;

  39. 

  40.     int version, subversion;

  41.     uint32_t pal[256];

  42.     int16_t delta_pal[768];

  43. 

  44.     int pitch;

  45.     int width, height;

  46.     int aligned_width, aligned_height;

  47.     int prev_seq;

  48. 

  49.     AVFrame frame, *output;

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

  51.     uint8_t *stored_frame;

  52.     uint32_t frm0_size, frm1_size, frm2_size;

  53.     uint32_t stored_frame_size;

  54. 

  55.     uint8_t *rle_buf;

  56.     unsigned int rle_buf_size;

  57. 

  58.     int rotate_code;

  59. 

  60.     long npixels, buf_size;

  61. 

  62.     uint16_t codebook[256];

  63.     uint16_t small_codebook[4];

  64. 

  65.     int8_t p4x4glyphs[NGLYPHS][16];

  66.     int8_t p8x8glyphs[NGLYPHS][64];

  67. } SANMVideoContext;

  68. 

  69. typedef struct {

  70.     int seq_num, codec, rotate_code, rle_output_size;

  71. 

  72.     uint16_t bg_color;

  73.     uint32_t width, height;

  74. } SANMFrameHeader;

  75. 

  76. enum GlyphEdge {

  77.     LEFT_EDGE,

  78.     TOP_EDGE,

  79.     RIGHT_EDGE,

  80.     BOTTOM_EDGE,

  81.     NO_EDGE

  82. };

  83. 

  84. enum GlyphDir {

  85.     DIR_LEFT,

  86.     DIR_UP,

  87.     DIR_RIGHT,

  88.     DIR_DOWN,

  89.     NO_DIR

  90. };

  91. 

  92. /**

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

  94.  *

  95.  * @param x x point coordinate

  96.  * @param y y point coordinate

  97.  * @param edge_size box width/height.

  98.  */

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

  100. {

  101.     const int edge_max = edge_size - 1;

  102. 

  103.     if (!y) {

  104.         return BOTTOM_EDGE;

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

  106.         return TOP_EDGE;

  107.     } else if (!x) {

  108.         return LEFT_EDGE;

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

  110.         return RIGHT_EDGE;

  111.     } else {

  112.         return NO_EDGE;

  113.     }

  114. }

  115. 

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

  117. {

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

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

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

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

  122.         return DIR_UP;

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

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

  125.         return DIR_DOWN;

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

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

  128.         return DIR_LEFT;

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

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

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

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

  133.         return DIR_RIGHT;

  134.     }

  135. 

  136.     return NO_DIR;

  137. }

  138. 

  139. /**

  140.  * Interpolate two points.

  141.  */

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

  143.                          int pos, int npoints)

  144. {

  145.     if (npoints) {

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

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

  148.     } else {

  149.         points[0] = x0;

  150.         points[1] = y0;

  151.     }

  152. }

  153. 

  154. /**

  155.  * Construct glyphs by iterating through vectors coordinates.

  156.  *

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

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

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

  160.  * @param side_length glyph width/height.

  161.  */

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

  163.                         const int side_length)

  164. {

  165.     const int glyph_size = side_length * side_length;

  166.     int8_t *pglyph = pglyphs;

  167. 

  168.     int i, j;

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

  170.         int x0    = xvec[i];

  171.         int y0    = yvec[i];

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

  173. 

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

  175.             int x1      = xvec[j];

  176.             int y1      = yvec[j];

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

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

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

  180.             int ipoint;

  181. 

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

  183.                 int8_t point[2];

  184.                 int irow, icol;

  185. 

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

  187. 

  188.                 switch (dir) {

  189.                 case DIR_UP:

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

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

  192.                     break;

  193. 

  194.                 case DIR_DOWN:

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

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

  197.                     break;

  198. 

  199.                 case DIR_LEFT:

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

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

  202.                     break;

  203. 

  204.                 case DIR_RIGHT:

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

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

  207.                     break;

  208.                 }

  209.             }

  210.         }

  211.     }

  212. }

  213. 

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

  215. {

  216.     ctx->width   = width;

  217.     ctx->height  = height;

  218.     ctx->npixels = width * height;

  219. 

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

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

  222. 

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

  224.     ctx->pitch    = width;

  225. }

  226. 

  227. static void destroy_buffers(SANMVideoContext *ctx)

  228. {

  229.     av_freep(&ctx->frm0);

  230.     av_freep(&ctx->frm1);

  231.     av_freep(&ctx->frm2);

  232.     av_freep(&ctx->stored_frame);

  233.     av_freep(&ctx->rle_buf);

  234. }

  235. 

  236. static av_cold int init_buffers(SANMVideoContext *ctx)

  237. {

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

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

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

  241.     if (!ctx->version)

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

  243. 

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

  245.         destroy_buffers(ctx);

  246.         return AVERROR(ENOMEM);

  247.     }

  248. 

  249.     return 0;

  250. }

  251. 

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

  253. {

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

  255.     if (rotate_code == 2)

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

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

  258. }

  259. 

  260. static av_cold int decode_init(AVCodecContext *avctx)

  261. {

  262.     SANMVideoContext *ctx = avctx->priv_data;

  263. 

  264.     ctx->avctx     = avctx;

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

  266. 

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

  268. 

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

  270.     if (init_buffers(ctx)) {

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

  272.         return AVERROR(ENOMEM);

  273.     }

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

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

  276. 

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

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

  279. 

  280.     if (!ctx->version) {

  281.         int i;

  282. 

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

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

  285.             return AVERROR_INVALIDDATA;

  286.         }

  287. 

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

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

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

  291.     }

  292. 

  293.     return 0;

  294. }

  295. 

  296. static av_cold int decode_end(AVCodecContext *avctx)

  297. {

  298.     SANMVideoContext *ctx = avctx->priv_data;

  299. 

  300.     destroy_buffers(ctx);

  301. 

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

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

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

  305.     }

  306. 

  307.     return 0;

  308. }

  309. 

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

  311. {

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

  313. 

  314.     while (left > 0) {

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

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

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

  318.             return AVERROR_INVALIDDATA;

  319. 

  320.         if (opcode & 1) {

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

  322.             memset(dst, color, run_len);

  323.         } else {

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

  325.                 return AVERROR_INVALIDDATA;

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

  327.         }

  328. 

  329.         dst  += run_len;

  330.         left -= run_len;

  331.     }

  332. 

  333.     return 0;

  334. }

  335. 

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

  337.                       int left, int width, int height)

  338. {

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

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

  341. 

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

  343.         pos = 0;

  344. 

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

  346.             return AVERROR_INVALIDDATA;

  347. 

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

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

  350. 

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

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

  353.                 return AVERROR_INVALIDDATA;

  354. 

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

  356.             flag = code & 1;

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

  358.             if (pos + code > width)

  359.                 return AVERROR_INVALIDDATA;

  360.             if (flag) {

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

  362.                 if (val)

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

  364.                 pos += code;

  365.             } else {

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

  367.                     return AVERROR_INVALIDDATA;

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

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

  370.                     if (val)

  371.                         dst[pos] = val;

  372.                     pos++;

  373.                 }

  374.             }

  375.         }

  376.         dst += ctx->pitch;

  377.     }

  378.     ctx->rotate_code = 0;

  379. 

  380.     return 0;

  381. }

  382. 

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

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

  385. {

  386.     int pos, i, j;

  387. 

  388.     pos = x + y * stride;

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

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

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

  392.                 dst[i] = 0;

  393.             else

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

  395.         }

  396.         dst += stride;

  397.         src += stride;

  398.         pos += stride;

  399.     }

  400. }

  401. 

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

  403.                        int left, int width, int height)

  404. {

  405.     int stride = ctx->pitch;

  406.     int i, j, k, t;

  407.     int skip_run = 0;

  408.     int compr, mvoff, seq, flags;

  409.     uint32_t decoded_size;

  410.     uint8_t *dst, *prev;

  411. 

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

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

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

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

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

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

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

  419. 

  420.     ctx->rotate_code = 0;

  421. 

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

  423.         rotate_bufs(ctx, 1);

  424. 

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

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

  427. 

  428.     if (mvoff > 2) {

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

  430.         return AVERROR_INVALIDDATA;

  431.     }

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

  433.     switch (compr) {

  434.     case 0:

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

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

  437.             dst += stride;

  438.         }

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

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

  441.         break;

  442.     case 2:

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

  444.             return AVERROR_INVALIDDATA;

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

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

  447.         break;

  448.     case 3:

  449.     case 4:

  450.         if (flags & 4) {

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

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

  453.                     int code;

  454.                     if (skip_run) {

  455.                         skip_run--;

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

  457.                         continue;

  458.                     }

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

  460.                         return AVERROR_INVALIDDATA;

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

  462.                     switch (code) {

  463.                     case 0xFF:

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

  465.                             return AVERROR_INVALIDDATA;

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

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

  468.                         break;

  469.                     case 0xFE:

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

  471.                             return AVERROR_INVALIDDATA;

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

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

  474.                         break;

  475.                     case 0xFD:

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

  477.                             return AVERROR_INVALIDDATA;

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

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

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

  481.                         break;

  482.                     default:

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

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

  485.                                 return AVERROR_INVALIDDATA;

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

  487.                             i -= 4;

  488.                         } else {

  489.                             int mx, my;

  490. 

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

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

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

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

  495.                         }

  496.                     }

  497.                 }

  498.                 dst  += stride * 4;

  499.                 prev += stride * 4;

  500.             }

  501.         } else {

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

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

  504.                     int code;

  505.                     if (skip_run) {

  506.                         skip_run--;

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

  508.                         continue;

  509.                     }

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

  511.                     if (code == 0xFF) {

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

  513.                             return AVERROR_INVALIDDATA;

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

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

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

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

  518.                             return AVERROR_INVALIDDATA;

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

  520.                         i -= 4;

  521.                     } else {

  522.                         int mx, my;

  523. 

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

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

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

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

  528.                     }

  529.                 }

  530.                 dst  += stride * 4;

  531.                 prev += stride * 4;

  532.             }

  533.         }

  534.         break;

  535.     default:

  536.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  538.         return AVERROR_PATCHWELCOME;

  539.     }

  540. 

  541.     return 0;

  542. }

  543. 

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

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

  546. {

  547.     int code, k, t;

  548.     uint8_t colors[2];

  549.     int8_t *pglyph;

  550. 

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

  552.         return AVERROR_INVALIDDATA;

  553. 

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

  555.     if (code >= 0xF8) {

  556.         switch (code) {

  557.         case 0xFF:

  558.             if (size == 2) {

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

  560.                     return AVERROR_INVALIDDATA;

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

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

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

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

  565.             } else {

  566.                 size >>= 1;

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

  568.                     return AVERROR_INVALIDDATA;

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

  570.                                   stride, tbl, size))

  571.                     return AVERROR_INVALIDDATA;

  572.                 dst   += size * stride;

  573.                 prev1 += size * stride;

  574.                 prev2 += size * stride;

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

  576.                     return AVERROR_INVALIDDATA;

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

  578.                                   stride, tbl, size))

  579.                     return AVERROR_INVALIDDATA;

  580.             }

  581.             break;

  582.         case 0xFE:

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

  584.                 return AVERROR_INVALIDDATA;

  585. 

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

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

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

  589.             break;

  590.         case 0xFD:

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

  592.                 return AVERROR_INVALIDDATA;

  593. 

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

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

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

  597. 

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

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

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

  601.             break;

  602.         case 0xFC:

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

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

  605.             break;

  606.         default:

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

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

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

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

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

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

  613.         }

  614.     } else {

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

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

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

  618. 

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

  620. 

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

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

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

  624.             return AVERROR_INVALIDDATA;

  625.         }

  626. 

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

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

  629.     }

  630. 

  631.     return 0;

  632. }

  633. 

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

  635.                        int left, int width, int height)

  636. {

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

  638.     int stride     = ctx->pitch;

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

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

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

  642.     uint32_t decoded_size;

  643. 

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

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

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

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

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

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

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

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

  652. 

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

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

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

  656.     }

  657. 

  658.     if (skip & 1)

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

  660.     if (!seq) {

  661.         ctx->prev_seq = -1;

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

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

  664.     }

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

  666.     switch (compr) {

  667.     case 0:

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

  669.             return AVERROR_INVALIDDATA;

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

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

  672.             dst += stride;

  673.         }

  674.         break;

  675.     case 1:

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

  677.             return AVERROR_INVALIDDATA;

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

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

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

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

  682.             }

  683.             dst += stride * 2;

  684.         }

  685.         break;

  686.     case 2:

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

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

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

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

  691.                                       tbl_pos + 8, 8))

  692.                         return AVERROR_INVALIDDATA;

  693.                 }

  694.                 dst   += stride * 8;

  695.                 prev1 += stride * 8;

  696.                 prev2 += stride * 8;

  697.             }

  698.         }

  699.         break;

  700.     case 3:

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

  702.         break;

  703.     case 4:

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

  705.         break;

  706.     case 5:

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

  708.             return AVERROR_INVALIDDATA;

  709.         break;

  710.     default:

  711.         av_log(ctx->avctx, AV_LOG_ERROR,

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

  713.         return AVERROR_PATCHWELCOME;

  714.     }

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

  716.         ctx->rotate_code = new_rot;

  717.     else

  718.         ctx->rotate_code = 0;

  719.     ctx->prev_seq = seq;

  720. 

  721.     return 0;

  722. }

  723. 

  724. static int process_frame_obj(SANMVideoContext *ctx)

  725. {

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

  727. 

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

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

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

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

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

  733. 

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

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

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

  737.             return AVERROR_INVALIDDATA;

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

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

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

  741.         if (init_buffers(ctx)) {

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

  743.             return AVERROR(ENOMEM);

  744.         }

  745.     }

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

  747. 

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

  749.     switch (codec) {

  750.     case 1:

  751.     case 3:

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

  753.         break;

  754.     case 37:

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

  756.         break;

  757.     case 47:

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

  759.         break;

  760.     default:

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

  762.         return AVERROR_PATCHWELCOME;

  763.     }

  764. }

  765. 

  766. static int decode_0(SANMVideoContext *ctx)

  767. {

  768.     uint16_t *frm = ctx->frm0;

  769.     int x, y;

  770. 

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

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

  773.         return AVERROR_INVALIDDATA;

  774.     }

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

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

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

  778.         frm += ctx->pitch;

  779.     }

  780.     return 0;

  781. }

  782. 

  783. static int decode_nop(SANMVideoContext *ctx)

  784. {

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

  786.     return AVERROR_PATCHWELCOME;

  787. }

  788. 

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

  790. {

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

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

  793.     int stride = pitch * 2;

  794. 

  795.     switch (block_size) {

  796.     case 2:

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

  798.         break;

  799.     case 4:

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

  801.         break;

  802.     case 8:

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

  804.         break;

  805.     }

  806. }

  807. 

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

  809. {

  810.     int x, y;

  811. 

  812.     pitch -= block_size;

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

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

  815.             *pdest++ = color;

  816. }

  817. 

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

  819.                       uint16_t bg_color, int block_size, int pitch)

  820. {

  821.     int8_t *pglyph;

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

  823.     int x, y;

  824. 

  825.     if (index >= NGLYPHS) {

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

  827.         return AVERROR_INVALIDDATA;

  828.     }

  829. 

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

  831.     pitch -= block_size;

  832. 

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

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

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

  836.     return 0;

  837. }

  838. 

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

  840. {

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

  842. 

  843.     if (block_size == 2) {

  844.         uint32_t indices;

  845. 

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

  847.             return AVERROR_INVALIDDATA;

  848. 

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

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

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

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

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

  854.     } else {

  855.         uint16_t fgcolor, bgcolor;

  856.         int glyph;

  857. 

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

  859.             return AVERROR_INVALIDDATA;

  860. 

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

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

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

  864. 

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

  866.     }

  867.     return 0;

  868. }

  869. 

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

  871. {

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

  873. 

  874.     if (block_size == 2) {

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

  876.             return AVERROR_INVALIDDATA;

  877. 

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

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

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

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

  882.     } else {

  883.         uint16_t fgcolor, bgcolor;

  884.         int glyph;

  885. 

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

  887.             return AVERROR_INVALIDDATA;

  888. 

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

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

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

  892. 

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

  894.     }

  895.     return 0;

  896. }

  897. 

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

  899.                      int block_size)

  900. {

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

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

  903. 

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

  905. 

  906.     if (!good) {

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

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

  909.     }

  910. 

  911.     return good;

  912. }

  913. 

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

  915. {

  916.     int16_t mx, my, index;

  917.     int opcode;

  918. 

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

  920.         return AVERROR_INVALIDDATA;

  921. 

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

  923. 

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

  925.     switch (opcode) {

  926.     default:

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

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

  929. 

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

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

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

  933.                        blk_size, ctx->pitch);

  934.         }

  935.         break;

  936.     case 0xF5:

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

  938.             return AVERROR_INVALIDDATA;

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

  940. 

  941.         mx = index % ctx->width;

  942.         my = index / ctx->width;

  943. 

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

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

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

  947.                        blk_size, ctx->pitch);

  948.         }

  949.         break;

  950.     case 0xF6:

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

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

  953.                    blk_size, ctx->pitch);

  954.         break;

  955.     case 0xF7:

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

  957.         break;

  958. 

  959.     case 0xF8:

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

  961.         break;

  962.     case 0xF9:

  963.     case 0xFA:

  964.     case 0xFB:

  965.     case 0xFC:

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

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

  968.         break;

  969.     case 0xFD:

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

  971.             return AVERROR_INVALIDDATA;

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

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

  974.         break;

  975.     case 0xFE:

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

  977.             return AVERROR_INVALIDDATA;

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

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

  980.         break;

  981.     case 0xFF:

  982.         if (blk_size == 2) {

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

  984.         } else {

  985.             blk_size >>= 1;

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

  987.                 return AVERROR_INVALIDDATA;

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

  989.                 return AVERROR_INVALIDDATA;

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

  991.                 return AVERROR_INVALIDDATA;

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

  993.                 return AVERROR_INVALIDDATA;

  994.         }

  995.         break;

  996.     }

  997.     return 0;

  998. }

  999. 

  1000. static int decode_2(SANMVideoContext *ctx)

  1001. {

  1002.     int cx, cy, ret;

  1003. 

  1004.     for (cy = 0; cy < ctx->aligned_height; cy += 8) {

  1005.         for (cx = 0; cx < ctx->aligned_width; cx += 8) {

  1006.             if (ret = codec2subblock(ctx, cx, cy, 8))

  1007.                 return ret;

  1008.         }

  1009.     }

  1010. 

  1011.     return 0;

  1012. }

  1013. 

  1014. static int decode_3(SANMVideoContext *ctx)

  1015. {

  1016.     memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);

  1017.     return 0;

  1018. }

  1019. 

  1020. static int decode_4(SANMVideoContext *ctx)

  1021. {

  1022.     memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);

  1023.     return 0;

  1024. }

  1025. 

  1026. static int decode_5(SANMVideoContext *ctx)

  1027. {

  1028. #if HAVE_BIGENDIAN

  1029.     uint16_t *frm;

  1030.     int npixels;

  1031. #endif

  1032.     uint8_t *dst = (uint8_t*)ctx->frm0;

  1033. 

  1034.     if (rle_decode(ctx, dst, ctx->buf_size))

  1035.         return AVERROR_INVALIDDATA;

  1036. 

  1037. #if HAVE_BIGENDIAN

  1038.     npixels = ctx->npixels;

  1039.     frm = ctx->frm0;

  1040.     while (npixels--)

  1041.         *frm++ = av_bswap16(*frm);

  1042. #endif

  1043. 

  1044.     return 0;

  1045. }

  1046. 

  1047. static int decode_6(SANMVideoContext *ctx)

  1048. {

  1049.     int npixels = ctx->npixels;

  1050.     uint16_t *frm = ctx->frm0;

  1051. 

  1052.     if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {

  1053.         av_log(ctx->avctx, AV_LOG_ERROR, "insufficient data for frame\n");

  1054.         return AVERROR_INVALIDDATA;

  1055.     }

  1056.     while (npixels--)

  1057.         *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1058. 

  1059.     return 0;

  1060. }

  1061. 

  1062. static int decode_8(SANMVideoContext *ctx)

  1063. {

  1064.     uint16_t *pdest = ctx->frm0;

  1065.     uint8_t *rsrc;

  1066.     long npixels = ctx->npixels;

  1067. 

  1068.     av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);

  1069.     if (!ctx->rle_buf) {

  1070.         av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed\n");

  1071.         return AVERROR(ENOMEM);

  1072.     }

  1073.     rsrc = ctx->rle_buf;

  1074. 

  1075.     if (rle_decode(ctx, rsrc, npixels))

  1076.         return AVERROR_INVALIDDATA;

  1077. 

  1078.     while (npixels--)

  1079.         *pdest++ = ctx->codebook[*rsrc++];

  1080. 

  1081.     return 0;

  1082. }

  1083. 

  1084. typedef int (*frm_decoder)(SANMVideoContext *ctx);

  1085. 

  1086. static const frm_decoder v1_decoders[] = {

  1087.     decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,

  1088.     decode_6, decode_nop, decode_8

  1089. };

  1090. 

  1091. static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1092. {

  1093.     int i, ret;

  1094. 

  1095.     if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {

  1096.         av_log(ctx->avctx, AV_LOG_ERROR, "too short input frame (%d bytes)\n",

  1097.                ret);

  1098.         return AVERROR_INVALIDDATA;

  1099.     }

  1100.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1101. 

  1102.     hdr->width  = bytestream2_get_le32u(&ctx->gb);

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

  1104. 

  1105.     if (hdr->width != ctx->width || hdr->height != ctx->height) {

  1106.         av_log(ctx->avctx, AV_LOG_ERROR, "variable size frames are not implemented\n");

  1107.         return AVERROR_PATCHWELCOME;

  1108.     }

  1109. 

  1110.     hdr->seq_num     = bytestream2_get_le16u(&ctx->gb);

  1111.     hdr->codec       = bytestream2_get_byteu(&ctx->gb);

  1112.     hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);

  1113. 

  1114.     bytestream2_skip(&ctx->gb, 4); // skip pad

  1115. 

  1116.     for (i = 0; i < 4; i++)

  1117.         ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1118.     hdr->bg_color = bytestream2_get_le16u(&ctx->gb);

  1119. 

  1120.     bytestream2_skip(&ctx->gb, 2); // skip pad

  1121. 

  1122.     hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);

  1123.     for (i = 0; i < 256; i++)

  1124.         ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1125. 

  1126.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1127. 

  1128.     av_dlog(ctx->avctx, "subcodec %d\n", hdr->codec);

  1129.     return 0;

  1130. }

  1131. 

  1132. static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)

  1133. {

  1134.     while (buf_size--)

  1135.         *pbuf++ = color;

  1136. }

  1137. 

  1138. static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1139. {

  1140.     uint8_t *dst;

  1141.     const uint8_t *src = (uint8_t*) ctx->frm0;

  1142.     int ret, dstpitch, height = ctx->height;

  1143.     int srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);

  1144. 

  1145.     if ((ret = ff_get_buffer(ctx->avctx, ctx->output)) < 0) {

  1146.         av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1147.         return ret;

  1148.     }

  1149. 

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

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

  1152. 

  1153.     while (height--) {

  1154.         memcpy(dst, src, srcpitch);

  1155.         src += srcpitch;

  1156.         dst += dstpitch;

  1157.     }

  1158. 

  1159.     return 0;

  1160. }

  1161. 

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

  1163.                         int *got_frame_ptr, AVPacket *pkt)

  1164. {

  1165.     SANMVideoContext *ctx = avctx->priv_data;

  1166.     int i, ret;

  1167. 

  1168.     bytestream2_init(&ctx->gb, pkt->data, pkt->size);

  1169.     if (ctx->output->data[0])

  1170.         avctx->release_buffer(avctx, ctx->output);

  1171. 

  1172.     if (!ctx->version) {

  1173.         int to_store = 0;

  1174. 

  1175.         while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {

  1176.             uint32_t sig, size;

  1177.             int pos;

  1178. 

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

  1180.             size = bytestream2_get_be32u(&ctx->gb);

  1181.             pos  = bytestream2_tell(&ctx->gb);

  1182. 

  1183.             if (bytestream2_get_bytes_left(&ctx->gb) < size) {

  1184.                 av_log(avctx, AV_LOG_ERROR, "incorrect chunk size %d\n", size);

  1185.                 break;

  1186.             }

  1187.             switch (sig) {

  1188.             case MKBETAG('N', 'P', 'A', 'L'):

  1189.                 if (size != 256 * 3) {

  1190.                     av_log(avctx, AV_LOG_ERROR, "incorrect palette block size %d\n",

  1191.                            size);

  1192.                     return AVERROR_INVALIDDATA;

  1193.                 }

  1194.                 for (i = 0; i < 256; i++)

  1195.                     ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1196.                 break;

  1197.             case MKBETAG('F', 'O', 'B', 'J'):

  1198.                 if (size < 16)

  1199.                     return AVERROR_INVALIDDATA;

  1200.                 if (ret = process_frame_obj(ctx))

  1201.                     return ret;

  1202.                 break;

  1203.             case MKBETAG('X', 'P', 'A', 'L'):

  1204.                 if (size == 6 || size == 4) {

  1205.                     uint8_t tmp[3];

  1206.                     int j;

  1207. 

  1208.                     for (i = 0; i < 256; i++) {

  1209.                         for (j = 0; j < 3; j++) {

  1210.                             int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;

  1211.                             tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);

  1212.                         }

  1213.                         ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);

  1214.                     }

  1215.                 } else {

  1216.                     if (size < 768 * 2 + 4) {

  1217.                         av_log(avctx, AV_LOG_ERROR, "incorrect palette change block size %d\n",

  1218.                                size);

  1219.                         return AVERROR_INVALIDDATA;

  1220.                     }

  1221.                     bytestream2_skipu(&ctx->gb, 4);

  1222.                     for (i = 0; i < 768; i++)

  1223.                         ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);

  1224.                     if (size >= 768 * 5 + 4) {

  1225.                         for (i = 0; i < 256; i++)

  1226.                             ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1227.                     } else {

  1228.                         memset(ctx->pal, 0, sizeof(ctx->pal));

  1229.                     }

  1230.                 }

  1231.                 break;

  1232.             case MKBETAG('S', 'T', 'O', 'R'):

  1233.                 to_store = 1;

  1234.                 break;

  1235.             case MKBETAG('F', 'T', 'C', 'H'):

  1236.                 memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);

  1237.                 break;

  1238.             default:

  1239.                 bytestream2_skip(&ctx->gb, size);

  1240.                 av_log(avctx, AV_LOG_DEBUG, "unknown/unsupported chunk %x\n", sig);

  1241.                 break;

  1242.             }

  1243. 

  1244.             bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);

  1245.             if (size & 1)

  1246.                 bytestream2_skip(&ctx->gb, 1);

  1247.         }

  1248.         if (to_store)

  1249.             memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);

  1250.         if ((ret = copy_output(ctx, NULL)))

  1251.             return ret;

  1252.         memcpy(ctx->output->data[1], ctx->pal, 1024);

  1253.     } else {

  1254.         SANMFrameHeader header;

  1255. 

  1256.         if ((ret = read_frame_header(ctx, &header)))

  1257.             return ret;

  1258. 

  1259.         ctx->rotate_code = header.rotate_code;

  1260.         if ((ctx->output->key_frame = !header.seq_num)) {

  1261.             ctx->output->pict_type = AV_PICTURE_TYPE_I;

  1262.             fill_frame(ctx->frm1, ctx->npixels, header.bg_color);

  1263.             fill_frame(ctx->frm2, ctx->npixels, header.bg_color);

  1264.         } else {

  1265.             ctx->output->pict_type = AV_PICTURE_TYPE_P;

  1266.         }

  1267. 

  1268.         if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {

  1269.             if ((ret = v1_decoders[header.codec](ctx))) {

  1270.                 av_log(avctx, AV_LOG_ERROR,

  1271.                        "subcodec %d: error decoding frame\n", header.codec);

  1272.                 return ret;

  1273.             }

  1274.         } else {

  1275.             av_log_ask_for_sample(avctx, "subcodec %d is not implemented\n",

  1276.                    header.codec);

  1277.             return AVERROR_PATCHWELCOME;

  1278.         }

  1279. 

  1280.         if ((ret = copy_output(ctx, &header)))

  1281.             return ret;

  1282.     }

  1283.     if (ctx->rotate_code)

  1284.         rotate_bufs(ctx, ctx->rotate_code);

  1285. 

  1286.     *got_frame_ptr  = 1;

  1287.     *(AVFrame*)data = *ctx->output;

  1288. 

  1289.     return pkt->size;

  1290. }

  1291. 

  1292. AVCodec ff_sanm_decoder = {

  1293.     .name           = "sanm",

  1294.     .type           = AVMEDIA_TYPE_VIDEO,

  1295.     .id             = AV_CODEC_ID_SANM,

  1296.     .priv_data_size = sizeof(SANMVideoContext),

  1297.     .init           = decode_init,

  1298.     .close          = decode_end,

  1299.     .decode         = decode_frame,

  1300.     .capabilities   = CODEC_CAP_DR1,

  1301.     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts SMUSH video"),

  1302. };