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FFmpeg/libavcodec/dvdsubdec.c

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  1. /*

  2.  * DVD subtitle decoding

  3.  * Copyright (c) 2005 Fabrice Bellard

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. #include "avcodec.h"

  22. #include "get_bits.h"

  23. #include "dsputil.h"

  24. #include "libavutil/attributes.h"

  25. #include "libavutil/colorspace.h"

  26. #include "libavutil/opt.h"

  27. #include "libavutil/imgutils.h"

  28. #include "libavutil/avstring.h"

  29. 

  30. typedef struct DVDSubContext

  31. {

  32.   AVClass *class;

  33.   uint32_t palette[16];

  34.   char    *palette_str;

  35.   int      has_palette;

  36.   uint8_t  colormap[4];

  37.   uint8_t  alpha[256];

  38. } DVDSubContext;

  39. 

  40. static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)

  41. {

  42.     const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  43.     uint8_t r, g, b;

  44.     int i, y, cb, cr;

  45.     int r_add, g_add, b_add;

  46. 

  47.     for (i = num_values; i > 0; i--) {

  48.         y = *ycbcr++;

  49.         cr = *ycbcr++;

  50.         cb = *ycbcr++;

  51.         YUV_TO_RGB1_CCIR(cb, cr);

  52.         YUV_TO_RGB2_CCIR(r, g, b, y);

  53.         *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;

  54.     }

  55. }

  56. 

  57. static int decode_run_2bit(GetBitContext *gb, int *color)

  58. {

  59.     unsigned int v, t;

  60. 

  61.     v = 0;

  62.     for (t = 1; v < t && t <= 0x40; t <<= 2)

  63.         v = (v << 4) | get_bits(gb, 4);

  64.     *color = v & 3;

  65.     if (v < 4) { /* Code for fill rest of line */

  66.         return INT_MAX;

  67.     }

  68.     return v >> 2;

  69. }

  70. 

  71. static int decode_run_8bit(GetBitContext *gb, int *color)

  72. {

  73.     int len;

  74.     int has_run = get_bits1(gb);

  75.     if (get_bits1(gb))

  76.         *color = get_bits(gb, 8);

  77.     else

  78.         *color = get_bits(gb, 2);

  79.     if (has_run) {

  80.         if (get_bits1(gb)) {

  81.             len = get_bits(gb, 7);

  82.             if (len == 0)

  83.                 len = INT_MAX;

  84.             else

  85.                 len += 9;

  86.         } else

  87.             len = get_bits(gb, 3) + 2;

  88.     } else

  89.         len = 1;

  90.     return len;

  91. }

  92. 

  93. static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,

  94.                       const uint8_t *buf, int start, int buf_size, int is_8bit)

  95. {

  96.     GetBitContext gb;

  97.     int bit_len;

  98.     int x, y, len, color;

  99.     uint8_t *d;

  100. 

  101.     bit_len = (buf_size - start) * 8;

  102.     init_get_bits(&gb, buf + start, bit_len);

  103. 

  104.     x = 0;

  105.     y = 0;

  106.     d = bitmap;

  107.     for(;;) {

  108.         if (get_bits_count(&gb) > bit_len)

  109.             return -1;

  110.         if (is_8bit)

  111.             len = decode_run_8bit(&gb, &color);

  112.         else

  113.             len = decode_run_2bit(&gb, &color);

  114.         len = FFMIN(len, w - x);

  115.         memset(d + x, color, len);

  116.         x += len;

  117.         if (x >= w) {

  118.             y++;

  119.             if (y >= h)

  120.                 break;

  121.             d += linesize;

  122.             x = 0;

  123.             /* byte align */

  124.             align_get_bits(&gb);

  125.         }

  126.     }

  127.     return 0;

  128. }

  129. 

  130. static void guess_palette(DVDSubContext* ctx,

  131.                           uint32_t *rgba_palette,

  132.                           uint32_t subtitle_color)

  133. {

  134.     static const uint8_t level_map[4][4] = {

  135.         // this configuration (full range, lowest to highest) in tests

  136.         // seemed most common, so assume this

  137.         {0xff},

  138.         {0x00, 0xff},

  139.         {0x00, 0x80, 0xff},

  140.         {0x00, 0x55, 0xaa, 0xff},

  141.     };

  142.     uint8_t color_used[16] = { 0 };

  143.     int nb_opaque_colors, i, level, j, r, g, b;

  144.     uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;

  145. 

  146.     if(ctx->has_palette) {

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

  148.             rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)

  149.                               | ((alpha[i] * 17U) << 24);

  150.         return;

  151.     }

  152. 

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

  154.         rgba_palette[i] = 0;

  155. 

  156.     nb_opaque_colors = 0;

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

  158.         if (alpha[i] != 0 && !color_used[colormap[i]]) {

  159.             color_used[colormap[i]] = 1;

  160.             nb_opaque_colors++;

  161.         }

  162.     }

  163. 

  164.     if (nb_opaque_colors == 0)

  165.         return;

  166. 

  167.     j = 0;

  168.     memset(color_used, 0, 16);

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

  170.         if (alpha[i] != 0) {

  171.             if (!color_used[colormap[i]])  {

  172.                 level = level_map[nb_opaque_colors][j];

  173.                 r = (((subtitle_color >> 16) & 0xff) * level) >> 8;

  174.                 g = (((subtitle_color >> 8) & 0xff) * level) >> 8;

  175.                 b = (((subtitle_color >> 0) & 0xff) * level) >> 8;

  176.                 rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24);

  177.                 color_used[colormap[i]] = (i + 1);

  178.                 j++;

  179.             } else {

  180.                 rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |

  181.                                     ((alpha[i] * 17) << 24);

  182.             }

  183.         }

  184.     }

  185. }

  186. 

  187. #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))

  188. 

  189. static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,

  190.                                 const uint8_t *buf, int buf_size)

  191. {

  192.     int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;

  193.     int big_offsets, offset_size, is_8bit = 0;

  194.     const uint8_t *yuv_palette = 0;

  195.     uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;

  196.     int date;

  197.     int i;

  198.     int is_menu = 0;

  199. 

  200.     if (buf_size < 10)

  201.         return -1;

  202. 

  203.     if (AV_RB16(buf) == 0) {   /* HD subpicture with 4-byte offsets */

  204.         big_offsets = 1;

  205.         offset_size = 4;

  206.         cmd_pos = 6;

  207.     } else {

  208.         big_offsets = 0;

  209.         offset_size = 2;

  210.         cmd_pos = 2;

  211.     }

  212. 

  213.     cmd_pos = READ_OFFSET(buf + cmd_pos);

  214. 

  215.     while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {

  216.         date = AV_RB16(buf + cmd_pos);

  217.         next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);

  218.         av_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",

  219.                 cmd_pos, next_cmd_pos, date);

  220.         pos = cmd_pos + 2 + offset_size;

  221.         offset1 = -1;

  222.         offset2 = -1;

  223.         x1 = y1 = x2 = y2 = 0;

  224.         while (pos < buf_size) {

  225.             cmd = buf[pos++];

  226.             av_dlog(NULL, "cmd=%02x\n", cmd);

  227.             switch(cmd) {

  228.             case 0x00:

  229.                 /* menu subpicture */

  230.                 is_menu = 1;

  231.                 break;

  232.             case 0x01:

  233.                 /* set start date */

  234.                 sub_header->start_display_time = (date << 10) / 90;

  235.                 break;

  236.             case 0x02:

  237.                 /* set end date */

  238.                 sub_header->end_display_time = (date << 10) / 90;

  239.                 break;

  240.             case 0x03:

  241.                 /* set colormap */

  242.                 if ((buf_size - pos) < 2)

  243.                     goto fail;

  244.                 colormap[3] = buf[pos] >> 4;

  245.                 colormap[2] = buf[pos] & 0x0f;

  246.                 colormap[1] = buf[pos + 1] >> 4;

  247.                 colormap[0] = buf[pos + 1] & 0x0f;

  248.                 pos += 2;

  249.                 break;

  250.             case 0x04:

  251.                 /* set alpha */

  252.                 if ((buf_size - pos) < 2)

  253.                     goto fail;

  254.                 alpha[3] = buf[pos] >> 4;

  255.                 alpha[2] = buf[pos] & 0x0f;

  256.                 alpha[1] = buf[pos + 1] >> 4;

  257.                 alpha[0] = buf[pos + 1] & 0x0f;

  258.                 pos += 2;

  259.             av_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);

  260.                 break;

  261.             case 0x05:

  262.             case 0x85:

  263.                 if ((buf_size - pos) < 6)

  264.                     goto fail;

  265.                 x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);

  266.                 x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];

  267.                 y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);

  268.                 y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];

  269.                 if (cmd & 0x80)

  270.                     is_8bit = 1;

  271.                 av_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);

  272.                 pos += 6;

  273.                 break;

  274.             case 0x06:

  275.                 if ((buf_size - pos) < 4)

  276.                     goto fail;

  277.                 offset1 = AV_RB16(buf + pos);

  278.                 offset2 = AV_RB16(buf + pos + 2);

  279.                 av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);

  280.                 pos += 4;

  281.                 break;

  282.             case 0x86:

  283.                 if ((buf_size - pos) < 8)

  284.                     goto fail;

  285.                 offset1 = AV_RB32(buf + pos);

  286.                 offset2 = AV_RB32(buf + pos + 4);

  287.                 av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);

  288.                 pos += 8;

  289.                 break;

  290. 

  291.             case 0x83:

  292.                 /* HD set palette */

  293.                 if ((buf_size - pos) < 768)

  294.                     goto fail;

  295.                 yuv_palette = buf + pos;

  296.                 pos += 768;

  297.                 break;

  298.             case 0x84:

  299.                 /* HD set contrast (alpha) */

  300.                 if ((buf_size - pos) < 256)

  301.                     goto fail;

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

  303.                     alpha[i] = 0xFF - buf[pos+i];

  304.                 pos += 256;

  305.                 break;

  306. 

  307.             case 0xff:

  308.                 goto the_end;

  309.             default:

  310.                 av_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);

  311.                 goto the_end;

  312.             }

  313.         }

  314.     the_end:

  315.         if (offset1 >= 0) {

  316.             int w, h;

  317.             uint8_t *bitmap;

  318. 

  319.             /* decode the bitmap */

  320.             w = x2 - x1 + 1;

  321.             if (w < 0)

  322.                 w = 0;

  323.             h = y2 - y1;

  324.             if (h < 0)

  325.                 h = 0;

  326.             if (w > 0 && h > 0) {

  327.                 if (sub_header->rects != NULL) {

  328.                     for (i = 0; i < sub_header->num_rects; i++) {

  329.                         av_freep(&sub_header->rects[i]->pict.data[0]);

  330.                         av_freep(&sub_header->rects[i]->pict.data[1]);

  331.                         av_freep(&sub_header->rects[i]);

  332.                     }

  333.                     av_freep(&sub_header->rects);

  334.                     sub_header->num_rects = 0;

  335.                 }

  336. 

  337.                 bitmap = av_malloc(w * h);

  338.                 sub_header->rects = av_mallocz(sizeof(*sub_header->rects));

  339.                 sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));

  340.                 sub_header->num_rects = 1;

  341.                 sub_header->rects[0]->pict.data[0] = bitmap;

  342.                 decode_rle(bitmap, w * 2, w, (h + 1) / 2,

  343.                            buf, offset1, buf_size, is_8bit);

  344.                 decode_rle(bitmap + w, w * 2, w, h / 2,

  345.                            buf, offset2, buf_size, is_8bit);

  346.                 sub_header->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE);

  347.                 if (is_8bit) {

  348.                     if (yuv_palette == 0)

  349.                         goto fail;

  350.                     sub_header->rects[0]->nb_colors = 256;

  351.                     yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256);

  352.                 } else {

  353.                     sub_header->rects[0]->nb_colors = 4;

  354.                     guess_palette(ctx, (uint32_t*)sub_header->rects[0]->pict.data[1],

  355.                                   0xffff00);

  356.                 }

  357.                 sub_header->rects[0]->x = x1;

  358.                 sub_header->rects[0]->y = y1;

  359.                 sub_header->rects[0]->w = w;

  360.                 sub_header->rects[0]->h = h;

  361.                 sub_header->rects[0]->type = SUBTITLE_BITMAP;

  362.                 sub_header->rects[0]->pict.linesize[0] = w;

  363.                 sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;

  364.             }

  365.         }

  366.         if (next_cmd_pos < cmd_pos) {

  367.             av_log(NULL, AV_LOG_ERROR, "Invalid command offset\n");

  368.             break;

  369.         }

  370.         if (next_cmd_pos == cmd_pos)

  371.             break;

  372.         cmd_pos = next_cmd_pos;

  373.     }

  374.     if (sub_header->num_rects > 0)

  375.         return is_menu;

  376.  fail:

  377.     if (sub_header->rects != NULL) {

  378.         for (i = 0; i < sub_header->num_rects; i++) {

  379.             av_freep(&sub_header->rects[i]->pict.data[0]);

  380.             av_freep(&sub_header->rects[i]->pict.data[1]);

  381.             av_freep(&sub_header->rects[i]);

  382.         }

  383.         av_freep(&sub_header->rects);

  384.         sub_header->num_rects = 0;

  385.     }

  386.     return -1;

  387. }

  388. 

  389. static int is_transp(const uint8_t *buf, int pitch, int n,

  390.                      const uint8_t *transp_color)

  391. {

  392.     int i;

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

  394.         if (!transp_color[*buf])

  395.             return 0;

  396.         buf += pitch;

  397.     }

  398.     return 1;

  399. }

  400. 

  401. /* return 0 if empty rectangle, 1 if non empty */

  402. static int find_smallest_bounding_rectangle(AVSubtitle *s)

  403. {

  404.     uint8_t transp_color[256] = { 0 };

  405.     int y1, y2, x1, x2, y, w, h, i;

  406.     uint8_t *bitmap;

  407. 

  408.     if (s->num_rects == 0 || s->rects == NULL || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)

  409.         return 0;

  410. 

  411.     for(i = 0; i < s->rects[0]->nb_colors; i++) {

  412.         if ((((uint32_t*)s->rects[0]->pict.data[1])[i] >> 24) == 0)

  413.             transp_color[i] = 1;

  414.     }

  415.     y1 = 0;

  416.     while (y1 < s->rects[0]->h && is_transp(s->rects[0]->pict.data[0] + y1 * s->rects[0]->pict.linesize[0],

  417.                                   1, s->rects[0]->w, transp_color))

  418.         y1++;

  419.     if (y1 == s->rects[0]->h) {

  420.         av_freep(&s->rects[0]->pict.data[0]);

  421.         s->rects[0]->w = s->rects[0]->h = 0;

  422.         return 0;

  423.     }

  424. 

  425.     y2 = s->rects[0]->h - 1;

  426.     while (y2 > 0 && is_transp(s->rects[0]->pict.data[0] + y2 * s->rects[0]->pict.linesize[0], 1,

  427.                                s->rects[0]->w, transp_color))

  428.         y2--;

  429.     x1 = 0;

  430.     while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->pict.data[0] + x1, s->rects[0]->pict.linesize[0],

  431.                                         s->rects[0]->h, transp_color))

  432.         x1++;

  433.     x2 = s->rects[0]->w - 1;

  434.     while (x2 > 0 && is_transp(s->rects[0]->pict.data[0] + x2, s->rects[0]->pict.linesize[0], s->rects[0]->h,

  435.                                   transp_color))

  436.         x2--;

  437.     w = x2 - x1 + 1;

  438.     h = y2 - y1 + 1;

  439.     bitmap = av_malloc(w * h);

  440.     if (!bitmap)

  441.         return 1;

  442.     for(y = 0; y < h; y++) {

  443.         memcpy(bitmap + w * y, s->rects[0]->pict.data[0] + x1 + (y1 + y) * s->rects[0]->pict.linesize[0], w);

  444.     }

  445.     av_freep(&s->rects[0]->pict.data[0]);

  446.     s->rects[0]->pict.data[0] = bitmap;

  447.     s->rects[0]->pict.linesize[0] = w;

  448.     s->rects[0]->w = w;

  449.     s->rects[0]->h = h;

  450.     s->rects[0]->x += x1;

  451.     s->rects[0]->y += y1;

  452.     return 1;

  453. }

  454. 

  455. #ifdef DEBUG

  456. #undef fprintf

  457. #undef perror

  458. #undef exit

  459. static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,

  460.                      uint32_t *rgba_palette)

  461. {

  462.     int x, y, v;

  463.     FILE *f;

  464. 

  465.     f = fopen(filename, "w");

  466.     if (!f) {

  467.         perror(filename);

  468.         exit(1);

  469.     }

  470.     fprintf(f, "P6\n"

  471.             "%d %d\n"

  472.             "%d\n",

  473.             w, h, 255);

  474.     for(y = 0; y < h; y++) {

  475.         for(x = 0; x < w; x++) {

  476.             v = rgba_palette[bitmap[y * w + x]];

  477.             putc((v >> 16) & 0xff, f);

  478.             putc((v >> 8) & 0xff, f);

  479.             putc((v >> 0) & 0xff, f);

  480.         }

  481.     }

  482.     fclose(f);

  483. }

  484. #endif

  485. 

  486. static int dvdsub_decode(AVCodecContext *avctx,

  487.                          void *data, int *data_size,

  488.                          AVPacket *avpkt)

  489. {

  490.     DVDSubContext *ctx = avctx->priv_data;

  491.     const uint8_t *buf = avpkt->data;

  492.     int buf_size = avpkt->size;

  493.     AVSubtitle *sub = data;

  494.     int is_menu;

  495. 

  496.     is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);

  497. 

  498.     if (is_menu < 0) {

  499.     no_subtitle:

  500.         *data_size = 0;

  501. 

  502.         return buf_size;

  503.     }

  504.     if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)

  505.         goto no_subtitle;

  506. 

  507. #if defined(DEBUG)

  508.     av_dlog(NULL, "start=%d ms end =%d ms\n",

  509.             sub->start_display_time,

  510.             sub->end_display_time);

  511.     ppm_save("/tmp/a.ppm", sub->rects[0]->pict.data[0],

  512.              sub->rects[0]->w, sub->rects[0]->h, sub->rects[0]->pict.data[1]);

  513. #endif

  514. 

  515.     *data_size = 1;

  516.     return buf_size;

  517. }

  518. 

  519. static void parse_palette(DVDSubContext *ctx, char *p)

  520. {

  521.     int i;

  522. 

  523.     ctx->has_palette = 1;

  524.     for(i=0;i<16;i++) {

  525.         ctx->palette[i] = strtoul(p, &p, 16);

  526.         while(*p == ',' || av_isspace(*p))

  527.             p++;

  528.     }

  529. }

  530. 

  531. static int dvdsub_parse_extradata(AVCodecContext *avctx)

  532. {

  533.     DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;

  534.     char *dataorig, *data;

  535. 

  536.     if (!avctx->extradata || !avctx->extradata_size)

  537.         return 1;

  538. 

  539.     dataorig = data = av_malloc(avctx->extradata_size+1);

  540.     if (!data)

  541.         return AVERROR(ENOMEM);

  542.     memcpy(data, avctx->extradata, avctx->extradata_size);

  543.     data[avctx->extradata_size] = '\0';

  544. 

  545.     for(;;) {

  546.         int pos = strcspn(data, "\n\r");

  547.         if (pos==0 && *data==0)

  548.             break;

  549. 

  550.         if (strncmp("palette:", data, 8) == 0) {

  551.             parse_palette(ctx, data + 8);

  552.         } else if (strncmp("size:", data, 5) == 0) {

  553.             int w, h;

  554.             if (sscanf(data + 5, "%dx%d", &w, &h) == 2 &&

  555.                 av_image_check_size(w, h, 0, avctx) >= 0)

  556.                 avcodec_set_dimensions(avctx, w, h);

  557.         }

  558. 

  559.         data += pos;

  560.         data += strspn(data, "\n\r");

  561.     }

  562. 

  563.     av_free(dataorig);

  564.     return 1;

  565. }

  566. 

  567. static av_cold int dvdsub_init(AVCodecContext *avctx)

  568. {

  569.     DVDSubContext *ctx = avctx->priv_data;

  570.     int ret;

  571. 

  572.     if ((ret = dvdsub_parse_extradata(avctx)) < 0)

  573.         return ret;

  574. 

  575.     if (ctx->palette_str)

  576.         parse_palette(ctx, ctx->palette_str);

  577.     if (ctx->has_palette) {

  578.         int i;

  579.         av_log(avctx, AV_LOG_DEBUG, "palette:");

  580.         for(i=0;i<16;i++)

  581.             av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]);

  582.         av_log(avctx, AV_LOG_DEBUG, "\n");

  583.     }

  584. 

  585.     return 1;

  586. }

  587. 

  588. #define OFFSET(field) offsetof(DVDSubContext, field)

  589. #define VD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

  590. static const AVOption options[] = {

  591.     { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VD },

  592.     { NULL }

  593. };

  594. static const AVClass dvdsub_class = {

  595.     .class_name = "dvdsubdec",

  596.     .item_name  = av_default_item_name,

  597.     .option     = options,

  598.     .version    = LIBAVUTIL_VERSION_INT,

  599. };

  600. 

  601. AVCodec ff_dvdsub_decoder = {

  602.     .name           = "dvdsub",

  603.     .type           = AVMEDIA_TYPE_SUBTITLE,

  604.     .id             = AV_CODEC_ID_DVD_SUBTITLE,

  605.     .priv_data_size = sizeof(DVDSubContext),

  606.     .init           = dvdsub_init,

  607.     .decode         = dvdsub_decode,

  608.     .long_name      = NULL_IF_CONFIG_SMALL("DVD subtitles"),

  609.     .priv_class     = &dvdsub_class,

  610. };