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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.   uint8_t  used_color[256];

  46. #ifdef DEBUG

  47.   int sub_id;

  48. #endif

  49. } DVDSubContext;

  50. 

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

  52. {

  53.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  54.     uint8_t r, g, b;

  55.     int i, y, cb, cr;

  56.     int r_add, g_add, b_add;

  57. 

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

  59.         y = *ycbcr++;

  60.         cr = *ycbcr++;

  61.         cb = *ycbcr++;

  62.         YUV_TO_RGB1_CCIR(cb, cr);

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

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

  65.     }

  66. }

  67. 

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

  69. {

  70.     unsigned int v, t;

  71. 

  72.     v = 0;

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

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

  75.     *color = v & 3;

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

  77.         return INT_MAX;

  78.     }

  79.     return v >> 2;

  80. }

  81. 

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

  83. {

  84.     int len;

  85.     int has_run = get_bits1(gb);

  86.     if (get_bits1(gb))

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

  88.     else

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

  90.     if (has_run) {

  91.         if (get_bits1(gb)) {

  92.             len = get_bits(gb, 7);

  93.             if (len == 0)

  94.                 len = INT_MAX;

  95.             else

  96.                 len += 9;

  97.         } else

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

  99.     } else

  100.         len = 1;

  101.     return len;

  102. }

  103. 

  104. static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_color[256],

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

  106. {

  107.     GetBitContext gb;

  108.     int bit_len;

  109.     int x, y, len, color;

  110.     uint8_t *d;

  111. 

  112.     if (start >= buf_size)

  113.         return -1;

  114. 

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

  116.         return -1;

  117. 

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

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

  120. 

  121.     x = 0;

  122.     y = 0;

  123.     d = bitmap;

  124.     for(;;) {

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

  126.             return -1;

  127.         if (is_8bit)

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

  129.         else

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

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

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

  133.         used_color[color] = 1;

  134.         x += len;

  135.         if (x >= w) {

  136.             y++;

  137.             if (y >= h)

  138.                 break;

  139.             d += linesize;

  140.             x = 0;

  141.             /* byte align */

  142.             align_get_bits(&gb);

  143.         }

  144.     }

  145.     return 0;

  146. }

  147. 

  148. static void guess_palette(DVDSubContext* ctx,

  149.                           uint32_t *rgba_palette,

  150.                           uint32_t subtitle_color)

  151. {

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

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

  154.         // seemed most common, so assume this

  155.         {0xff},

  156.         {0x00, 0xff},

  157.         {0x00, 0x80, 0xff},

  158.         {0x00, 0x55, 0xaa, 0xff},

  159.     };

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

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

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

  163. 

  164.     if(ctx->has_palette) {

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

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

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

  168.         return;

  169.     }

  170. 

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

  172.         rgba_palette[i] = 0;

  173. 

  174.     nb_opaque_colors = 0;

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

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

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

  178.             nb_opaque_colors++;

  179.         }

  180.     }

  181. 

  182.     if (nb_opaque_colors == 0)

  183.         return;

  184. 

  185.     j = 0;

  186.     memset(color_used, 0, 16);

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

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

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

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

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

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

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

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

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

  196.                 j++;

  197.             } else {

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

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

  200.             }

  201.         }

  202.     }

  203. }

  204. 

  205. static void reset_rects(AVSubtitle *sub_header)

  206. {

  207.     int i;

  208. 

  209.     if (sub_header->rects) {

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

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

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

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

  214.         }

  215.         av_freep(&sub_header->rects);

  216.         sub_header->num_rects = 0;

  217.     }

  218. }

  219. 

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

  221. 

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

  223.                                 const uint8_t *buf, int buf_size)

  224. {

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

  226.     int big_offsets, offset_size, is_8bit = 0;

  227.     const uint8_t *yuv_palette = NULL;

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

  229.     int date;

  230.     int i;

  231.     int is_menu = 0;

  232.     uint32_t size;

  233.     int64_t offset1, offset2;

  234. 

  235.     if (buf_size < 10)

  236.         return -1;

  237. 

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

  239.         big_offsets = 1;

  240.         offset_size = 4;

  241.         cmd_pos = 6;

  242.     } else {

  243.         big_offsets = 0;

  244.         offset_size = 2;

  245.         cmd_pos = 2;

  246.     }

  247. 

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

  249.     cmd_pos = READ_OFFSET(buf + cmd_pos);

  250. 

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

  252.         if (cmd_pos > size) {

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

  254.             return 0;

  255.         }

  256.         return AVERROR(EAGAIN);

  257.     }

  258. 

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

  260.         date = AV_RB16(buf + cmd_pos);

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

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

  263.                 cmd_pos, next_cmd_pos, date);

  264.         pos = cmd_pos + 2 + offset_size;

  265.         offset1 = -1;

  266.         offset2 = -1;

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

  268.         while (pos < buf_size) {

  269.             cmd = buf[pos++];

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

  271.             switch(cmd) {

  272.             case 0x00:

  273.                 /* menu subpicture */

  274.                 is_menu = 1;

  275.                 break;

  276.             case 0x01:

  277.                 /* set start date */

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

  279.                 break;

  280.             case 0x02:

  281.                 /* set end date */

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

  283.                 break;

  284.             case 0x03:

  285.                 /* set colormap */

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

  287.                     goto fail;

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

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

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

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

  292.                 pos += 2;

  293.                 break;

  294.             case 0x04:

  295.                 /* set alpha */

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

  297.                     goto fail;

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

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

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

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

  302.                 pos += 2;

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

  304.                 break;

  305.             case 0x05:

  306.             case 0x85:

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

  308.                     goto fail;

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

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

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

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

  313.                 if (cmd & 0x80)

  314.                     is_8bit = 1;

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

  316.                 pos += 6;

  317.                 break;

  318.             case 0x06:

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

  320.                     goto fail;

  321.                 offset1 = AV_RB16(buf + pos);

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

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

  324.                 pos += 4;

  325.                 break;

  326.             case 0x86:

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

  328.                     goto fail;

  329.                 offset1 = AV_RB32(buf + pos);

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

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

  332.                 pos += 8;

  333.                 break;

  334. 

  335.             case 0x83:

  336.                 /* HD set palette */

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

  338.                     goto fail;

  339.                 yuv_palette = buf + pos;

  340.                 pos += 768;

  341.                 break;

  342.             case 0x84:

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

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

  345.                     goto fail;

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

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

  348.                 pos += 256;

  349.                 break;

  350. 

  351.             case 0xff:

  352.                 goto the_end;

  353.             default:

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

  355.                 goto the_end;

  356.             }

  357.         }

  358.     the_end:

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

  360.             goto fail;

  361. 

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

  363.             int w, h;

  364.             uint8_t *bitmap;

  365. 

  366.             /* decode the bitmap */

  367.             w = x2 - x1 + 1;

  368.             if (w < 0)

  369.                 w = 0;

  370.             h = y2 - y1 + 1;

  371.             if (h < 0)

  372.                 h = 0;

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

  374.                 reset_rects(sub_header);

  375.                 memset(ctx->used_color, 0, sizeof(ctx->used_color));

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

  377.                 if (!sub_header->rects)

  378.                     goto fail;

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

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

  381.                     goto fail;

  382.                 sub_header->num_rects = 1;

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

  384.                 if (!bitmap)

  385.                     goto fail;

  386.                 if (decode_rle(bitmap, w * 2, w, (h + 1) / 2, ctx->used_color,

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

  388.                     goto fail;

  389.                 if (decode_rle(bitmap + w, w * 2, w, h / 2, ctx->used_color,

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

  391.                     goto fail;

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

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

  394.                     goto fail;

  395.                 if (is_8bit) {

  396.                     if (!yuv_palette)

  397.                         goto fail;

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

  399.                     yuv_a_to_rgba(yuv_palette, alpha,

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

  401.                                   256);

  402.                 } else {

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

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

  405.                                   0xffff00);

  406.                 }

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

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

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

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

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

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

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

  414. 

  415. #if FF_API_AVPICTURE

  416. FF_DISABLE_DEPRECATION_WARNINGS

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

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

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

  420.                 }

  421. FF_ENABLE_DEPRECATION_WARNINGS

  422. #endif

  423.             }

  424.         }

  425.         if (next_cmd_pos < cmd_pos) {

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

  427.             break;

  428.         }

  429.         if (next_cmd_pos == cmd_pos)

  430.             break;

  431.         cmd_pos = next_cmd_pos;

  432.     }

  433.     if (sub_header->num_rects > 0)

  434.         return is_menu;

  435.  fail:

  436.     reset_rects(sub_header);

  437.     return -1;

  438. }

  439. 

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

  441.                      const uint8_t *transp_color)

  442. {

  443.     int i;

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

  445.         if (!transp_color[*buf])

  446.             return 0;

  447.         buf += pitch;

  448.     }

  449.     return 1;

  450. }

  451. 

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

  453. static int find_smallest_bounding_rectangle(DVDSubContext *ctx, AVSubtitle *s)

  454. {

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

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

  457.     uint8_t *bitmap;

  458.     int transparent = 1;

  459. 

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

  461.         return 0;

  462. 

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

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

  465.             transp_color[i] = 1;

  466.         } else if (ctx->used_color[i])

  467.             transparent = 0;

  468.     }

  469.     if (transparent)

  470.         return 0;

  471.     y1 = 0;

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

  473.                                   1, s->rects[0]->w, transp_color))

  474.         y1++;

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

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

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

  478.         return 0;

  479.     }

  480. 

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

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

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

  484.         y2--;

  485.     x1 = 0;

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

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

  488.         x1++;

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

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

  491.                                   transp_color))

  492.         x2--;

  493.     w = x2 - x1 + 1;

  494.     h = y2 - y1 + 1;

  495.     bitmap = av_malloc(w * h);

  496.     if (!bitmap)

  497.         return 1;

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

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

  500.     }

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

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

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

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

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

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

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

  508. 

  509. #if FF_API_AVPICTURE

  510. FF_DISABLE_DEPRECATION_WARNINGS

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

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

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

  514.     }

  515. FF_ENABLE_DEPRECATION_WARNINGS

  516. #endif

  517. 

  518.     return 1;

  519. }

  520. 

  521. #ifdef DEBUG

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

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

  524.                      uint32_t *rgba_palette)

  525. {

  526.     int x, y, alpha;

  527.     uint32_t v;

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

  529.     FILE *f;

  530. 

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

  532.     if (!f) {

  533.         perror(filename);

  534.         return;

  535.     }

  536.     fprintf(f, "P6\n"

  537.             "%d %d\n"

  538.             "%d\n",

  539.             w, h, 255);

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

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

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

  543.             alpha = v >> 24;

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

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

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

  547.         }

  548.     }

  549.     fclose(f);

  550. }

  551. #endif

  552. 

  553. static int append_to_cached_buf(AVCodecContext *avctx,

  554.                                 const uint8_t *buf, int buf_size)

  555. {

  556.     DVDSubContext *ctx = avctx->priv_data;

  557. 

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

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

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

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

  562.         ctx->buf_size = 0;

  563.         return AVERROR_INVALIDDATA;

  564.     }

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

  566.     ctx->buf_size += buf_size;

  567.     return 0;

  568. }

  569. 

  570. static int dvdsub_decode(AVCodecContext *avctx,

  571.                          void *data, int *data_size,

  572.                          AVPacket *avpkt)

  573. {

  574.     DVDSubContext *ctx = avctx->priv_data;

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

  576.     int buf_size = avpkt->size;

  577.     AVSubtitle *sub = data;

  578.     int appended = 0;

  579.     int is_menu;

  580. 

  581.     if (ctx->buf_size) {

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

  583.         if (ret < 0) {

  584.             *data_size = 0;

  585.             return ret;

  586.         }

  587.         buf = ctx->buf;

  588.         buf_size = ctx->buf_size;

  589.         appended = 1;

  590.     }

  591. 

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

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

  594.         *data_size = 0;

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

  596.     }

  597. 

  598.     if (is_menu < 0) {

  599.     no_subtitle:

  600.         reset_rects(sub);

  601.         *data_size = 0;

  602. 

  603.         return buf_size;

  604.     }

  605.     if (!is_menu && find_smallest_bounding_rectangle(ctx, sub) == 0)

  606.         goto no_subtitle;

  607. 

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

  609.         goto no_subtitle;

  610. 

  611. #if defined(DEBUG)

  612.     {

  613.     char ppm_name[32];

  614. 

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

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

  617.             sub->start_display_time,

  618.             sub->end_display_time);

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

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

  621.     }

  622. #endif

  623. 

  624.     ctx->buf_size = 0;

  625.     *data_size = 1;

  626.     return buf_size;

  627. }

  628. 

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

  630. {

  631.     int i;

  632. 

  633.     ctx->has_palette = 1;

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

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

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

  637.             p++;

  638.     }

  639. }

  640. 

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

  642. {

  643.     FILE *ifo;

  644.     char ifostr[12];

  645.     uint32_t sp_pgci, pgci, off_pgc, pgc;

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

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

  648.     int ret = 0;

  649.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  650. 

  651.     ctx->has_palette = 0;

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

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

  654.         return AVERROR_EOF;

  655.     }

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

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

  658.         ret = AVERROR_INVALIDDATA;

  659.         goto end;

  660.     }

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

  662.         ret = AVERROR(errno);

  663.         goto end;

  664.     }

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

  666.         pgci = av_be2ne32(sp_pgci) * 2048;

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

  668.             ret = AVERROR(errno);

  669.             goto end;

  670.         }

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

  672.             pgc = pgci + av_be2ne32(off_pgc);

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

  674.                 ret = AVERROR(errno);

  675.                 goto end;

  676.             }

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

  678.                 buf = yuv;

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

  680.                     y  = *++buf;

  681.                     cr = *++buf;

  682.                     cb = *++buf;

  683.                     YUV_TO_RGB1_CCIR(cb, cr);

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

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

  686.                     buf++;

  687.                 }

  688.                 ctx->has_palette = 1;

  689.             }

  690.         }

  691.     }

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

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

  694.         ret = AVERROR_INVALIDDATA;

  695.     }

  696. end:

  697.     fclose(ifo);

  698.     return ret;

  699. }

  700. 

  701. static int dvdsub_parse_extradata(AVCodecContext *avctx)

  702. {

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

  704.     char *dataorig, *data;

  705.     int ret = 1;

  706. 

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

  708.         return 1;

  709. 

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

  711.     if (!data)

  712.         return AVERROR(ENOMEM);

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

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

  715. 

  716.     for(;;) {

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

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

  719.             break;

  720. 

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

  722.             parse_palette(ctx, data + 8);

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

  724.             int w, h;

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

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

  727.                if (ret < 0)

  728.                    goto fail;

  729.             }

  730.         }

  731. 

  732.         data += pos;

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

  734.     }

  735. 

  736. fail:

  737.     av_free(dataorig);

  738.     return ret;

  739. }

  740. 

  741. static av_cold int dvdsub_init(AVCodecContext *avctx)

  742. {

  743.     DVDSubContext *ctx = avctx->priv_data;

  744.     int ret;

  745. 

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

  747.         return ret;

  748. 

  749.     if (ctx->ifo_str)

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

  751.     if (ctx->palette_str)

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

  753.     if (ctx->has_palette) {

  754.         int i;

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

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

  757.             av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32, ctx->palette[i]);

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

  759.     }

  760. 

  761.     return 1;

  762. }

  763. 

  764. static void dvdsub_flush(AVCodecContext *avctx)

  765. {

  766.     DVDSubContext *ctx = avctx->priv_data;

  767.     ctx->buf_size = 0;

  768. }

  769. 

  770. static av_cold int dvdsub_close(AVCodecContext *avctx)

  771. {

  772.     dvdsub_flush(avctx);

  773.     return 0;

  774. }

  775. 

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

  777. #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

  778. static const AVOption options[] = {

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

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

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

  782.     { NULL }

  783. };

  784. static const AVClass dvdsub_class = {

  785.     .class_name = "dvdsubdec",

  786.     .item_name  = av_default_item_name,

  787.     .option     = options,

  788.     .version    = LIBAVUTIL_VERSION_INT,

  789. };

  790. 

  791. AVCodec ff_dvdsub_decoder = {

  792.     .name           = "dvdsub",

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

  794.     .type           = AVMEDIA_TYPE_SUBTITLE,

  795.     .id             = AV_CODEC_ID_DVD_SUBTITLE,

  796.     .priv_data_size = sizeof(DVDSubContext),

  797.     .init           = dvdsub_init,

  798.     .decode         = dvdsub_decode,

  799.     .flush          = dvdsub_flush,

  800.     .close          = dvdsub_close,

  801.     .priv_class     = &dvdsub_class,

  802. };