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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 "internal.h"

  25. 

  26. #include "libavutil/attributes.h"

  27. #include "libavutil/colorspace.h"

  28. #include "libavutil/opt.h"

  29. #include "libavutil/imgutils.h"

  30. #include "libavutil/avstring.h"

  31. 

  32. typedef struct DVDSubContext

  33. {

  34.   AVClass *class;

  35.   uint32_t palette[16];

  36.   char    *palette_str;

  37.   int      has_palette;

  38.   uint8_t  colormap[4];

  39.   uint8_t  alpha[256];

  40.   uint8_t *buf;

  41.   int      buf_size;

  42. #ifdef DEBUG

  43.   int sub_id;

  44. #endif

  45. } DVDSubContext;

  46. 

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

  48. {

  49.     const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  50.     uint8_t r, g, b;

  51.     int i, y, cb, cr;

  52.     int r_add, g_add, b_add;

  53. 

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

  55.         y = *ycbcr++;

  56.         cr = *ycbcr++;

  57.         cb = *ycbcr++;

  58.         YUV_TO_RGB1_CCIR(cb, cr);

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

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

  61.     }

  62. }

  63. 

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

  65. {

  66.     unsigned int v, t;

  67. 

  68.     v = 0;

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

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

  71.     *color = v & 3;

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

  73.         return INT_MAX;

  74.     }

  75.     return v >> 2;

  76. }

  77. 

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

  79. {

  80.     int len;

  81.     int has_run = get_bits1(gb);

  82.     if (get_bits1(gb))

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

  84.     else

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

  86.     if (has_run) {

  87.         if (get_bits1(gb)) {

  88.             len = get_bits(gb, 7);

  89.             if (len == 0)

  90.                 len = INT_MAX;

  91.             else

  92.                 len += 9;

  93.         } else

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

  95.     } else

  96.         len = 1;

  97.     return len;

  98. }

  99. 

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

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

  102. {

  103.     GetBitContext gb;

  104.     int bit_len;

  105.     int x, y, len, color;

  106.     uint8_t *d;

  107. 

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

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

  110. 

  111.     x = 0;

  112.     y = 0;

  113.     d = bitmap;

  114.     for(;;) {

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

  116.             return -1;

  117.         if (is_8bit)

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

  119.         else

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

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

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

  123.         x += len;

  124.         if (x >= w) {

  125.             y++;

  126.             if (y >= h)

  127.                 break;

  128.             d += linesize;

  129.             x = 0;

  130.             /* byte align */

  131.             align_get_bits(&gb);

  132.         }

  133.     }

  134.     return 0;

  135. }

  136. 

  137. static void guess_palette(DVDSubContext* ctx,

  138.                           uint32_t *rgba_palette,

  139.                           uint32_t subtitle_color)

  140. {

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

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

  143.         // seemed most common, so assume this

  144.         {0xff},

  145.         {0x00, 0xff},

  146.         {0x00, 0x80, 0xff},

  147.         {0x00, 0x55, 0xaa, 0xff},

  148.     };

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

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

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

  152. 

  153.     if(ctx->has_palette) {

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

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

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

  157.         return;

  158.     }

  159. 

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

  161.         rgba_palette[i] = 0;

  162. 

  163.     nb_opaque_colors = 0;

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

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

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

  167.             nb_opaque_colors++;

  168.         }

  169.     }

  170. 

  171.     if (nb_opaque_colors == 0)

  172.         return;

  173. 

  174.     j = 0;

  175.     memset(color_used, 0, 16);

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

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

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

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

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

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

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

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

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

  185.                 j++;

  186.             } else {

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

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

  189.             }

  190.         }

  191.     }

  192. }

  193. 

  194. static void reset_rects(AVSubtitle *sub_header)

  195. {

  196.     int i;

  197. 

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

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

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

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

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

  203.         }

  204.         av_freep(&sub_header->rects);

  205.         sub_header->num_rects = 0;

  206.     }

  207. }

  208. 

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

  210. 

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

  212.                                 const uint8_t *buf, int buf_size)

  213. {

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

  215.     int big_offsets, offset_size, is_8bit = 0;

  216.     const uint8_t *yuv_palette = 0;

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

  218.     int date;

  219.     int i;

  220.     int is_menu = 0;

  221. 

  222.     if (buf_size < 10)

  223.         return -1;

  224. 

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

  226.         big_offsets = 1;

  227.         offset_size = 4;

  228.         cmd_pos = 6;

  229.     } else {

  230.         big_offsets = 0;

  231.         offset_size = 2;

  232.         cmd_pos = 2;

  233.     }

  234. 

  235.     cmd_pos = READ_OFFSET(buf + cmd_pos);

  236. 

  237.     if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size)

  238.         return AVERROR(EAGAIN);

  239. 

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

  241.         date = AV_RB16(buf + cmd_pos);

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

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

  244.                 cmd_pos, next_cmd_pos, date);

  245.         pos = cmd_pos + 2 + offset_size;

  246.         offset1 = -1;

  247.         offset2 = -1;

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

  249.         while (pos < buf_size) {

  250.             cmd = buf[pos++];

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

  252.             switch(cmd) {

  253.             case 0x00:

  254.                 /* menu subpicture */

  255.                 is_menu = 1;

  256.                 break;

  257.             case 0x01:

  258.                 /* set start date */

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

  260.                 break;

  261.             case 0x02:

  262.                 /* set end date */

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

  264.                 break;

  265.             case 0x03:

  266.                 /* set colormap */

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

  268.                     goto fail;

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

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

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

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

  273.                 pos += 2;

  274.                 break;

  275.             case 0x04:

  276.                 /* set alpha */

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

  278.                     goto fail;

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

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

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

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

  283.                 pos += 2;

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

  285.                 break;

  286.             case 0x05:

  287.             case 0x85:

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

  289.                     goto fail;

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

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

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

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

  294.                 if (cmd & 0x80)

  295.                     is_8bit = 1;

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

  297.                 pos += 6;

  298.                 break;

  299.             case 0x06:

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

  301.                     goto fail;

  302.                 offset1 = AV_RB16(buf + pos);

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

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

  305.                 pos += 4;

  306.                 break;

  307.             case 0x86:

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

  309.                     goto fail;

  310.                 offset1 = AV_RB32(buf + pos);

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

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

  313.                 pos += 8;

  314.                 break;

  315. 

  316.             case 0x83:

  317.                 /* HD set palette */

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

  319.                     goto fail;

  320.                 yuv_palette = buf + pos;

  321.                 pos += 768;

  322.                 break;

  323.             case 0x84:

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

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

  326.                     goto fail;

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

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

  329.                 pos += 256;

  330.                 break;

  331. 

  332.             case 0xff:

  333.                 goto the_end;

  334.             default:

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

  336.                 goto the_end;

  337.             }

  338.         }

  339.     the_end:

  340.         if (offset1 >= 0) {

  341.             int w, h;

  342.             uint8_t *bitmap;

  343. 

  344.             /* decode the bitmap */

  345.             w = x2 - x1 + 1;

  346.             if (w < 0)

  347.                 w = 0;

  348.             h = y2 - y1;

  349.             if (h < 0)

  350.                 h = 0;

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

  352.                 reset_rects(sub_header);

  353. 

  354.                 bitmap = av_malloc(w * h);

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

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

  357.                 sub_header->num_rects = 1;

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

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

  360.                            buf, offset1, buf_size, is_8bit);

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

  362.                            buf, offset2, buf_size, is_8bit);

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

  364.                 if (is_8bit) {

  365.                     if (yuv_palette == 0)

  366.                         goto fail;

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

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

  369.                 } else {

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

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

  372.                                   0xffff00);

  373.                 }

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

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

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

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

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

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

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

  381.             }

  382.         }

  383.         if (next_cmd_pos < cmd_pos) {

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

  385.             break;

  386.         }

  387.         if (next_cmd_pos == cmd_pos)

  388.             break;

  389.         cmd_pos = next_cmd_pos;

  390.     }

  391.     if (sub_header->num_rects > 0)

  392.         return is_menu;

  393.  fail:

  394.     reset_rects(sub_header);

  395.     return -1;

  396. }

  397. 

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

  399.                      const uint8_t *transp_color)

  400. {

  401.     int i;

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

  403.         if (!transp_color[*buf])

  404.             return 0;

  405.         buf += pitch;

  406.     }

  407.     return 1;

  408. }

  409. 

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

  411. static int find_smallest_bounding_rectangle(AVSubtitle *s)

  412. {

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

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

  415.     uint8_t *bitmap;

  416. 

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

  418.         return 0;

  419. 

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

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

  422.             transp_color[i] = 1;

  423.     }

  424.     y1 = 0;

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

  426.                                   1, s->rects[0]->w, transp_color))

  427.         y1++;

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

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

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

  431.         return 0;

  432.     }

  433. 

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

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

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

  437.         y2--;

  438.     x1 = 0;

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

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

  441.         x1++;

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

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

  444.                                   transp_color))

  445.         x2--;

  446.     w = x2 - x1 + 1;

  447.     h = y2 - y1 + 1;

  448.     bitmap = av_malloc(w * h);

  449.     if (!bitmap)

  450.         return 1;

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

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

  453.     }

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

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

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

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

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

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

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

  461.     return 1;

  462. }

  463. 

  464. #ifdef DEBUG

  465. #undef fprintf

  466. #undef perror

  467. #undef exit

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

  469.                      uint32_t *rgba_palette)

  470. {

  471.     int x, y, v;

  472.     FILE *f;

  473. 

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

  475.     if (!f) {

  476.         perror(filename);

  477.         exit(1);

  478.     }

  479.     fprintf(f, "P6\n"

  480.             "%d %d\n"

  481.             "%d\n",

  482.             w, h, 255);

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

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

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

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

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

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

  489.         }

  490.     }

  491.     fclose(f);

  492. }

  493. #endif

  494. 

  495. static int append_to_cached_buf(AVCodecContext *avctx,

  496.                                 const uint8_t *buf, int buf_size)

  497. {

  498.     DVDSubContext *ctx = avctx->priv_data;

  499. 

  500.     if (ctx->buf_size > 0xffff - buf_size) {

  501.         av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "

  502.                "too large SPU packets aborted.\n");

  503.         av_freep(&ctx->buf);

  504.         return AVERROR_INVALIDDATA;

  505.     }

  506.     ctx->buf = av_realloc(ctx->buf, ctx->buf_size + buf_size);

  507.     if (!ctx->buf)

  508.         return AVERROR(ENOMEM);

  509.     memcpy(ctx->buf + ctx->buf_size, buf, buf_size);

  510.     ctx->buf_size += buf_size;

  511.     return 0;

  512. }

  513. 

  514. static int dvdsub_decode(AVCodecContext *avctx,

  515.                          void *data, int *data_size,

  516.                          AVPacket *avpkt)

  517. {

  518.     DVDSubContext *ctx = avctx->priv_data;

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

  520.     int buf_size = avpkt->size;

  521.     AVSubtitle *sub = data;

  522.     int is_menu;

  523. 

  524.     if (ctx->buf) {

  525.         int ret = append_to_cached_buf(avctx, buf, buf_size);

  526.         if (ret < 0) {

  527.             *data_size = 0;

  528.             return ret;

  529.         }

  530.         buf = ctx->buf;

  531.         buf_size = ctx->buf_size;

  532.     }

  533. 

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

  535.     if (is_menu == AVERROR(EAGAIN)) {

  536.         *data_size = 0;

  537.         return append_to_cached_buf(avctx, buf, buf_size);

  538.     }

  539. 

  540.     if (is_menu < 0) {

  541.     no_subtitle:

  542.         *data_size = 0;

  543. 

  544.         return buf_size;

  545.     }

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

  547.         goto no_subtitle;

  548. 

  549. #if defined(DEBUG)

  550.     {

  551.     char ppm_name[32];

  552. 

  553.     snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++);

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

  555.             sub->start_display_time,

  556.             sub->end_display_time);

  557.     ppm_save(ppm_name, sub->rects[0]->pict.data[0],

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

  559.     }

  560. #endif

  561. 

  562.     av_freep(&ctx->buf);

  563.     ctx->buf_size = 0;

  564.     *data_size = 1;

  565.     return buf_size;

  566. }

  567. 

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

  569. {

  570.     int i;

  571. 

  572.     ctx->has_palette = 1;

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

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

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

  576.             p++;

  577.     }

  578. }

  579. 

  580. static int dvdsub_parse_extradata(AVCodecContext *avctx)

  581. {

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

  583.     char *dataorig, *data;

  584. 

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

  586.         return 1;

  587. 

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

  589.     if (!data)

  590.         return AVERROR(ENOMEM);

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

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

  593. 

  594.     for(;;) {

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

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

  597.             break;

  598. 

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

  600.             parse_palette(ctx, data + 8);

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

  602.             int w, h;

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

  604.                int ret = ff_set_dimensions(avctx, w, h);

  605.                if (ret < 0)

  606.                    return ret;

  607.             }

  608.         }

  609. 

  610.         data += pos;

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

  612.     }

  613. 

  614.     av_free(dataorig);

  615.     return 1;

  616. }

  617. 

  618. static av_cold int dvdsub_init(AVCodecContext *avctx)

  619. {

  620.     DVDSubContext *ctx = avctx->priv_data;

  621.     int ret;

  622. 

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

  624.         return ret;

  625. 

  626.     if (ctx->palette_str)

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

  628.     if (ctx->has_palette) {

  629.         int i;

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

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

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

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

  634.     }

  635. 

  636.     return 1;

  637. }

  638. 

  639. static av_cold int dvdsub_close(AVCodecContext *avctx)

  640. {

  641.     DVDSubContext *ctx = avctx->priv_data;

  642.     av_freep(&ctx->buf);

  643.     ctx->buf_size = 0;

  644.     return 0;

  645. }

  646. 

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

  648. #define VD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

  649. static const AVOption options[] = {

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

  651.     { NULL }

  652. };

  653. static const AVClass dvdsub_class = {

  654.     .class_name = "dvdsubdec",

  655.     .item_name  = av_default_item_name,

  656.     .option     = options,

  657.     .version    = LIBAVUTIL_VERSION_INT,

  658. };

  659. 

  660. AVCodec ff_dvdsub_decoder = {

  661.     .name           = "dvdsub",

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

  663.     .type           = AVMEDIA_TYPE_SUBTITLE,

  664.     .id             = AV_CODEC_ID_DVD_SUBTITLE,

  665.     .priv_data_size = sizeof(DVDSubContext),

  666.     .init           = dvdsub_init,

  667.     .decode         = dvdsub_decode,

  668.     .close          = dvdsub_close,

  669.     .priv_class     = &dvdsub_class,

  670. };