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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. 

  22. #include "avcodec.h"

  23. #include "get_bits.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. #include "libavutil/bswap.h"

  32. 

  33. typedef struct DVDSubContext

  34. {

  35.   AVClass *class;

  36.   uint32_t palette[16];

  37.   char    *palette_str;

  38.   char    *ifo_str;

  39.   int      has_palette;

  40.   uint8_t  colormap[4];

  41.   uint8_t  alpha[256];

  42.   uint8_t  buf[0x10000];

  43.   int      buf_size;

  44.   int      forced_subs_only;

  45. #ifdef DEBUG

  46.   int sub_id;

  47. #endif

  48. } DVDSubContext;

  49. 

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

  51. {

  52.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  53.     uint8_t r, g, b;

  54.     int i, y, cb, cr;

  55.     int r_add, g_add, b_add;

  56. 

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

  58.         y = *ycbcr++;

  59.         cr = *ycbcr++;

  60.         cb = *ycbcr++;

  61.         YUV_TO_RGB1_CCIR(cb, cr);

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

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

  64.     }

  65. }

  66. 

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

  68. {

  69.     unsigned int v, t;

  70. 

  71.     v = 0;

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

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

  74.     *color = v & 3;

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

  76.         return INT_MAX;

  77.     }

  78.     return v >> 2;

  79. }

  80. 

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

  82. {

  83.     int len;

  84.     int has_run = get_bits1(gb);

  85.     *color = get_bits(gb, 2 + 6*get_bits1(gb));

  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.     if (start >= buf_size)

  109.         return -1;

  110. 

  111.     if (w <= 0 || h <= 0)

  112.         return -1;

  113. 

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

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

  116. 

  117.     x = 0;

  118.     y = 0;

  119.     d = bitmap;

  120.     for(;;) {

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

  122.             return -1;

  123.         if (is_8bit)

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

  125.         else

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

  127.         if (len != INT_MAX && len > w - x)

  128.             return AVERROR_INVALIDDATA;

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

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

  131.         x += len;

  132.         if (x >= w) {

  133.             y++;

  134.             if (y >= h)

  135.                 break;

  136.             d += linesize;

  137.             x = 0;

  138.             /* byte align */

  139.             align_get_bits(&gb);

  140.         }

  141.     }

  142.     return 0;

  143. }

  144. 

  145. static void guess_palette(DVDSubContext* ctx,

  146.                           uint32_t *rgba_palette,

  147.                           uint32_t subtitle_color)

  148. {

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

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

  151.         // seemed most common, so assume this

  152.         {0xff},

  153.         {0x00, 0xff},

  154.         {0x00, 0x80, 0xff},

  155.         {0x00, 0x55, 0xaa, 0xff},

  156.     };

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

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

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

  160. 

  161.     if(ctx->has_palette) {

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

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

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

  165.         return;

  166.     }

  167. 

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

  169.         rgba_palette[i] = 0;

  170. 

  171.     nb_opaque_colors = 0;

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

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

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

  175.             nb_opaque_colors++;

  176.         }

  177.     }

  178. 

  179.     if (nb_opaque_colors == 0)

  180.         return;

  181. 

  182.     j = 0;

  183.     memset(color_used, 0, 16);

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

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

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

  187.                 level = level_map[nb_opaque_colors - 1][j];

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

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

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

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

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

  193.                 j++;

  194.             } else {

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

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

  197.             }

  198.         }

  199.     }

  200. }

  201. 

  202. static void reset_rects(AVSubtitle *sub_header)

  203. {

  204.     int i;

  205. 

  206.     if (sub_header->rects) {

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

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

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

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

  211.         }

  212.         av_freep(&sub_header->rects);

  213.         sub_header->num_rects = 0;

  214.     }

  215. }

  216. 

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

  218. 

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

  220.                                 const uint8_t *buf, int buf_size)

  221. {

  222.     int cmd_pos, pos, cmd, x1, y1, x2, y2, next_cmd_pos;

  223.     int big_offsets, offset_size, is_8bit = 0;

  224.     const uint8_t *yuv_palette = NULL;

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

  226.     int date;

  227.     int i;

  228.     int is_menu = 0;

  229.     uint32_t size;

  230.     int64_t offset1, offset2;

  231. 

  232.     if (buf_size < 10)

  233.         return -1;

  234. 

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

  236.         big_offsets = 1;

  237.         offset_size = 4;

  238.         cmd_pos = 6;

  239.     } else {

  240.         big_offsets = 0;

  241.         offset_size = 2;

  242.         cmd_pos = 2;

  243.     }

  244. 

  245.     size = READ_OFFSET(buf + (big_offsets ? 2 : 0));

  246.     cmd_pos = READ_OFFSET(buf + cmd_pos);

  247. 

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

  249.         if (cmd_pos > size) {

  250.             av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n");

  251.             return 0;

  252.         }

  253.         return AVERROR(EAGAIN);

  254.     }

  255. 

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

  257.         date = AV_RB16(buf + cmd_pos);

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

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

  260.                 cmd_pos, next_cmd_pos, date);

  261.         pos = cmd_pos + 2 + offset_size;

  262.         offset1 = -1;

  263.         offset2 = -1;

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

  265.         while (pos < buf_size) {

  266.             cmd = buf[pos++];

  267.             ff_dlog(NULL, "cmd=%02x\n", cmd);

  268.             switch(cmd) {

  269.             case 0x00:

  270.                 /* menu subpicture */

  271.                 is_menu = 1;

  272.                 break;

  273.             case 0x01:

  274.                 /* set start date */

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

  276.                 break;

  277.             case 0x02:

  278.                 /* set end date */

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

  280.                 break;

  281.             case 0x03:

  282.                 /* set colormap */

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

  284.                     goto fail;

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

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

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

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

  289.                 pos += 2;

  290.                 break;

  291.             case 0x04:

  292.                 /* set alpha */

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

  294.                     goto fail;

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

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

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

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

  299.                 pos += 2;

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

  301.                 break;

  302.             case 0x05:

  303.             case 0x85:

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

  305.                     goto fail;

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

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

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

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

  310.                 if (cmd & 0x80)

  311.                     is_8bit = 1;

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

  313.                 pos += 6;

  314.                 break;

  315.             case 0x06:

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

  317.                     goto fail;

  318.                 offset1 = AV_RB16(buf + pos);

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

  320.                 ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);

  321.                 pos += 4;

  322.                 break;

  323.             case 0x86:

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

  325.                     goto fail;

  326.                 offset1 = AV_RB32(buf + pos);

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

  328.                 ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);

  329.                 pos += 8;

  330.                 break;

  331. 

  332.             case 0x83:

  333.                 /* HD set palette */

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

  335.                     goto fail;

  336.                 yuv_palette = buf + pos;

  337.                 pos += 768;

  338.                 break;

  339.             case 0x84:

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

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

  342.                     goto fail;

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

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

  345.                 pos += 256;

  346.                 break;

  347. 

  348.             case 0xff:

  349.                 goto the_end;

  350.             default:

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

  352.                 goto the_end;

  353.             }

  354.         }

  355.     the_end:

  356.         if (offset1 >= buf_size || offset2 >= buf_size)

  357.             goto fail;

  358. 

  359.         if (offset1 >= 0 && offset2 >= 0) {

  360.             int w, h;

  361.             uint8_t *bitmap;

  362. 

  363.             /* decode the bitmap */

  364.             w = x2 - x1 + 1;

  365.             if (w < 0)

  366.                 w = 0;

  367.             h = y2 - y1 + 1;

  368.             if (h < 0)

  369.                 h = 0;

  370.             if (w > 0 && h > 1) {

  371.                 reset_rects(sub_header);

  372. 

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

  374.                 if (!sub_header->rects)

  375.                     goto fail;

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

  377.                 if (!sub_header->rects[0])

  378.                     goto fail;

  379.                 sub_header->num_rects = 1;

  380.                 bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h);

  381.                 if (!bitmap)

  382.                     goto fail;

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

  384.                                buf, offset1, buf_size, is_8bit) < 0)

  385.                     goto fail;

  386.                 if (decode_rle(bitmap + w, w * 2, w, h / 2,

  387.                                buf, offset2, buf_size, is_8bit) < 0)

  388.                     goto fail;

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

  390.                 if (!sub_header->rects[0]->data[1])

  391.                     goto fail;

  392.                 if (is_8bit) {

  393.                     if (!yuv_palette)

  394.                         goto fail;

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

  396.                     yuv_a_to_rgba(yuv_palette, alpha,

  397.                                   (uint32_t *)sub_header->rects[0]->data[1],

  398.                                   256);

  399.                 } else {

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

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

  402.                                   0xffff00);

  403.                 }

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

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

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

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

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

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

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

  411. 

  412. #if FF_API_AVPICTURE

  413. FF_DISABLE_DEPRECATION_WARNINGS

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

  415.                     sub_header->rects[0]->pict.data[i] = sub_header->rects[0]->data[i];

  416.                     sub_header->rects[0]->pict.linesize[i] = sub_header->rects[0]->linesize[i];

  417.                 }

  418. FF_ENABLE_DEPRECATION_WARNINGS

  419. #endif

  420.             }

  421.         }

  422.         if (next_cmd_pos < cmd_pos) {

  423.             av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n");

  424.             break;

  425.         }

  426.         if (next_cmd_pos == cmd_pos)

  427.             break;

  428.         cmd_pos = next_cmd_pos;

  429.     }

  430.     if (sub_header->num_rects > 0)

  431.         return is_menu;

  432.  fail:

  433.     reset_rects(sub_header);

  434.     return -1;

  435. }

  436. 

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

  438.                      const uint8_t *transp_color)

  439. {

  440.     int i;

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

  442.         if (!transp_color[*buf])

  443.             return 0;

  444.         buf += pitch;

  445.     }

  446.     return 1;

  447. }

  448. 

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

  450. static int find_smallest_bounding_rectangle(AVSubtitle *s)

  451. {

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

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

  454.     uint8_t *bitmap;

  455. 

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

  457.         return 0;

  458. 

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

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

  461.             transp_color[i] = 1;

  462.     }

  463.     y1 = 0;

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

  465.                                   1, s->rects[0]->w, transp_color))

  466.         y1++;

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

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

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

  470.         return 0;

  471.     }

  472. 

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

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

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

  476.         y2--;

  477.     x1 = 0;

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

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

  480.         x1++;

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

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

  483.                                   transp_color))

  484.         x2--;

  485.     w = x2 - x1 + 1;

  486.     h = y2 - y1 + 1;

  487.     bitmap = av_malloc(w * h);

  488.     if (!bitmap)

  489.         return 1;

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

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

  492.     }

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

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

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

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

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

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

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

  500. 

  501. #if FF_API_AVPICTURE

  502. FF_DISABLE_DEPRECATION_WARNINGS

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

  504.         s->rects[0]->pict.data[i] = s->rects[0]->data[i];

  505.         s->rects[0]->pict.linesize[i] = s->rects[0]->linesize[i];

  506.     }

  507. FF_ENABLE_DEPRECATION_WARNINGS

  508. #endif

  509. 

  510.     return 1;

  511. }

  512. 

  513. #ifdef DEBUG

  514. #define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)

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

  516.                      uint32_t *rgba_palette)

  517. {

  518.     int x, y, alpha;

  519.     uint32_t v;

  520.     int back[3] = {0, 255, 0};  /* green background */

  521.     FILE *f;

  522. 

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

  524.     if (!f) {

  525.         perror(filename);

  526.         return;

  527.     }

  528.     fprintf(f, "P6\n"

  529.             "%d %d\n"

  530.             "%d\n",

  531.             w, h, 255);

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

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

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

  535.             alpha = v >> 24;

  536.             putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);

  537.             putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);

  538.             putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);

  539.         }

  540.     }

  541.     fclose(f);

  542. }

  543. #endif

  544. 

  545. static int append_to_cached_buf(AVCodecContext *avctx,

  546.                                 const uint8_t *buf, int buf_size)

  547. {

  548.     DVDSubContext *ctx = avctx->priv_data;

  549. 

  550.     av_assert0(buf_size >= 0 && ctx->buf_size <= sizeof(ctx->buf));

  551.     if (buf_size >= sizeof(ctx->buf) - ctx->buf_size) {

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

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

  554.         ctx->buf_size = 0;

  555.         return AVERROR_INVALIDDATA;

  556.     }

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

  558.     ctx->buf_size += buf_size;

  559.     return 0;

  560. }

  561. 

  562. static int dvdsub_decode(AVCodecContext *avctx,

  563.                          void *data, int *data_size,

  564.                          AVPacket *avpkt)

  565. {

  566.     DVDSubContext *ctx = avctx->priv_data;

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

  568.     int buf_size = avpkt->size;

  569.     AVSubtitle *sub = data;

  570.     int appended = 0;

  571.     int is_menu;

  572. 

  573.     if (ctx->buf_size) {

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

  575.         if (ret < 0) {

  576.             *data_size = 0;

  577.             return ret;

  578.         }

  579.         buf = ctx->buf;

  580.         buf_size = ctx->buf_size;

  581.         appended = 1;

  582.     }

  583. 

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

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

  586.         *data_size = 0;

  587.         return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size);

  588.     }

  589. 

  590.     if (is_menu < 0) {

  591.     no_subtitle:

  592.         reset_rects(sub);

  593.         *data_size = 0;

  594. 

  595.         return buf_size;

  596.     }

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

  598.         goto no_subtitle;

  599. 

  600.     if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))

  601.         goto no_subtitle;

  602. 

  603. #if defined(DEBUG)

  604.     {

  605.     char ppm_name[32];

  606. 

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

  608.     ff_dlog(NULL, "start=%d ms end =%d ms\n",

  609.             sub->start_display_time,

  610.             sub->end_display_time);

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

  612.              sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->data[1]);

  613.     }

  614. #endif

  615. 

  616.     ctx->buf_size = 0;

  617.     *data_size = 1;

  618.     return buf_size;

  619. }

  620. 

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

  622. {

  623.     int i;

  624. 

  625.     ctx->has_palette = 1;

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

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

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

  629.             p++;

  630.     }

  631. }

  632. 

  633. static int parse_ifo_palette(DVDSubContext *ctx, char *p)

  634. {

  635.     FILE *ifo;

  636.     char ifostr[12];

  637.     uint32_t sp_pgci, pgci, off_pgc, pgc;

  638.     uint8_t r, g, b, yuv[65], *buf;

  639.     int i, y, cb, cr, r_add, g_add, b_add;

  640.     int ret = 0;

  641.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  642. 

  643.     ctx->has_palette = 0;

  644.     if ((ifo = fopen(p, "r")) == NULL) {

  645.         av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));

  646.         return AVERROR_EOF;

  647.     }

  648.     if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {

  649.         av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);

  650.         ret = AVERROR_INVALIDDATA;

  651.         goto end;

  652.     }

  653.     if (fseek(ifo, 0xCC, SEEK_SET) == -1) {

  654.         ret = AVERROR(errno);

  655.         goto end;

  656.     }

  657.     if (fread(&sp_pgci, 4, 1, ifo) == 1) {

  658.         pgci = av_be2ne32(sp_pgci) * 2048;

  659.         if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {

  660.             ret = AVERROR(errno);

  661.             goto end;

  662.         }

  663.         if (fread(&off_pgc, 4, 1, ifo) == 1) {

  664.             pgc = pgci + av_be2ne32(off_pgc);

  665.             if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {

  666.                 ret = AVERROR(errno);

  667.                 goto end;

  668.             }

  669.             if (fread(yuv, 64, 1, ifo) == 1) {

  670.                 buf = yuv;

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

  672.                     y  = *++buf;

  673.                     cr = *++buf;

  674.                     cb = *++buf;

  675.                     YUV_TO_RGB1_CCIR(cb, cr);

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

  677.                     ctx->palette[i] = (r << 16) + (g << 8) + b;

  678.                     buf++;

  679.                 }

  680.                 ctx->has_palette = 1;

  681.             }

  682.         }

  683.     }

  684.     if (ctx->has_palette == 0) {

  685.         av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);

  686.         ret = AVERROR_INVALIDDATA;

  687.     }

  688. end:

  689.     fclose(ifo);

  690.     return ret;

  691. }

  692. 

  693. static int dvdsub_parse_extradata(AVCodecContext *avctx)

  694. {

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

  696.     char *dataorig, *data;

  697.     int ret = 1;

  698. 

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

  700.         return 1;

  701. 

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

  703.     if (!data)

  704.         return AVERROR(ENOMEM);

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

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

  707. 

  708.     for(;;) {

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

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

  711.             break;

  712. 

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

  714.             parse_palette(ctx, data + 8);

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

  716.             int w, h;

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

  718.                ret = ff_set_dimensions(avctx, w, h);

  719.                if (ret < 0)

  720.                    goto fail;

  721.             }

  722.         }

  723. 

  724.         data += pos;

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

  726.     }

  727. 

  728. fail:

  729.     av_free(dataorig);

  730.     return ret;

  731. }

  732. 

  733. static av_cold int dvdsub_init(AVCodecContext *avctx)

  734. {

  735.     DVDSubContext *ctx = avctx->priv_data;

  736.     int ret;

  737. 

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

  739.         return ret;

  740. 

  741.     if (ctx->ifo_str)

  742.         parse_ifo_palette(ctx, ctx->ifo_str);

  743.     if (ctx->palette_str)

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

  745.     if (ctx->has_palette) {

  746.         int i;

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

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

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

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

  751.     }

  752. 

  753.     return 1;

  754. }

  755. 

  756. static void dvdsub_flush(AVCodecContext *avctx)

  757. {

  758.     DVDSubContext *ctx = avctx->priv_data;

  759.     ctx->buf_size = 0;

  760. }

  761. 

  762. static av_cold int dvdsub_close(AVCodecContext *avctx)

  763. {

  764.     dvdsub_flush(avctx);

  765.     return 0;

  766. }

  767. 

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

  769. #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

  770. static const AVOption options[] = {

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

  772.     { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },

  773.     { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},

  774.     { NULL }

  775. };

  776. static const AVClass dvdsub_class = {

  777.     .class_name = "dvdsubdec",

  778.     .item_name  = av_default_item_name,

  779.     .option     = options,

  780.     .version    = LIBAVUTIL_VERSION_INT,

  781. };

  782. 

  783. AVCodec ff_dvdsub_decoder = {

  784.     .name           = "dvdsub",

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

  786.     .type           = AVMEDIA_TYPE_SUBTITLE,

  787.     .id             = AV_CODEC_ID_DVD_SUBTITLE,

  788.     .priv_data_size = sizeof(DVDSubContext),

  789.     .init           = dvdsub_init,

  790.     .decode         = dvdsub_decode,

  791.     .flush          = dvdsub_flush,

  792.     .close          = dvdsub_close,

  793.     .priv_class     = &dvdsub_class,

  794. };