mirror of https://git.ffmpeg.org/ffmpeg.git
382 lines
11 KiB
C
382 lines
11 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* MicroDVD subtitle decoder
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*
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* Based on the specifications found here:
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* https://trac.videolan.org/vlc/ticket/1825#comment:6
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/bprint.h"
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#include "avcodec.h"
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#include "ass.h"
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#include "codec_internal.h"
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static int indexof(const char *s, int c)
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{
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char *f = strchr(s, c);
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return f ? (f - s) : -1;
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}
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struct microdvd_tag {
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char key;
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int persistent;
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uint32_t data1;
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uint32_t data2;
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char *data_string;
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int data_string_len;
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};
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#define MICRODVD_PERSISTENT_OFF 0
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#define MICRODVD_PERSISTENT_ON 1
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#define MICRODVD_PERSISTENT_OPENED 2
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// Color, Font, Size, cHarset, stYle, Position, cOordinate
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#define MICRODVD_TAGS "cfshyYpo"
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static void microdvd_set_tag(struct microdvd_tag *tags, struct microdvd_tag tag)
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{
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int tag_index = indexof(MICRODVD_TAGS, tag.key);
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if (tag_index < 0)
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return;
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memcpy(&tags[tag_index], &tag, sizeof(tag));
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}
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// italic, bold, underline, strike-through
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#define MICRODVD_STYLES "ibus"
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/* some samples have lines that start with a / indicating non persistent italic
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* marker */
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static char *check_for_italic_slash_marker(struct microdvd_tag *tags, char *s)
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{
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if (*s == '/') {
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struct microdvd_tag tag = tags[indexof(MICRODVD_TAGS, 'y')];
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tag.key = 'y';
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tag.data1 |= 1 << 0 /* 'i' position in MICRODVD_STYLES */;
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microdvd_set_tag(tags, tag);
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s++;
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}
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return s;
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}
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static char *microdvd_load_tags(struct microdvd_tag *tags, char *s)
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{
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s = check_for_italic_slash_marker(tags, s);
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while (*s == '{') {
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char *start = s;
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char tag_char = *(s + 1);
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struct microdvd_tag tag = {0};
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if (!tag_char || *(s + 2) != ':')
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break;
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s += 3;
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switch (tag_char) {
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/* Style */
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case 'Y':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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case 'y':
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while (*s && *s != '}' && s - start < 256) {
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int style_index = indexof(MICRODVD_STYLES, *s);
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if (style_index >= 0)
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tag.data1 |= (1 << style_index);
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s++;
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}
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if (*s != '}')
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break;
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/* We must distinguish persistent and non-persistent styles
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* to handle this kind of style tags: {y:ib}{Y:us} */
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tag.key = tag_char;
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break;
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/* Color */
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case 'C':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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case 'c':
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while (*s == '$' || *s == '#')
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s++;
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tag.data1 = strtol(s, &s, 16) & 0x00ffffff;
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if (*s != '}')
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break;
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tag.key = 'c';
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break;
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/* Font name */
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case 'F':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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case 'f': {
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int len = indexof(s, '}');
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if (len < 0)
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break;
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tag.data_string = s;
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tag.data_string_len = len;
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s += len;
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tag.key = 'f';
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break;
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}
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/* Font size */
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case 'S':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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case 's':
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tag.data1 = strtol(s, &s, 10);
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if (*s != '}')
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break;
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tag.key = 's';
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break;
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/* Charset */
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case 'H': {
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//TODO: not yet handled, just parsed.
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int len = indexof(s, '}');
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if (len < 0)
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break;
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tag.data_string = s;
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tag.data_string_len = len;
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s += len;
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tag.key = 'h';
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break;
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}
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/* Position */
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case 'P':
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if (!*s)
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break;
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tag.persistent = MICRODVD_PERSISTENT_ON;
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tag.data1 = (*s++ == '1');
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if (*s != '}')
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break;
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tag.key = 'p';
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break;
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/* Coordinates */
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case 'o':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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tag.data1 = strtol(s, &s, 10);
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if (*s != ',')
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break;
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s++;
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tag.data2 = strtol(s, &s, 10);
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if (*s != '}')
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break;
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tag.key = 'o';
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break;
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default: /* Unknown tag, we consider it's text */
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break;
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}
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if (tag.key == 0)
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return start;
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microdvd_set_tag(tags, tag);
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s++;
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}
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return check_for_italic_slash_marker(tags, s);
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}
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static void microdvd_open_tags(AVBPrint *new_line, struct microdvd_tag *tags)
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{
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int i, sidx;
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for (i = 0; i < sizeof(MICRODVD_TAGS) - 1; i++) {
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if (tags[i].persistent == MICRODVD_PERSISTENT_OPENED)
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continue;
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switch (tags[i].key) {
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case 'Y':
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case 'y':
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for (sidx = 0; sidx < sizeof(MICRODVD_STYLES) - 1; sidx++)
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if (tags[i].data1 & (1 << sidx))
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av_bprintf(new_line, "{\\%c1}", MICRODVD_STYLES[sidx]);
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break;
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case 'c':
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av_bprintf(new_line, "{\\c&H%06"PRIX32"&}", tags[i].data1);
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break;
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case 'f':
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av_bprintf(new_line, "{\\fn%.*s}",
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tags[i].data_string_len, tags[i].data_string);
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break;
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case 's':
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av_bprintf(new_line, "{\\fs%"PRId32"}", tags[i].data1);
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break;
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case 'p':
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if (tags[i].data1 == 0)
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av_bprintf(new_line, "{\\an8}");
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break;
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case 'o':
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av_bprintf(new_line, "{\\pos(%"PRId32",%"PRId32")}",
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tags[i].data1, tags[i].data2);
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break;
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}
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if (tags[i].persistent == MICRODVD_PERSISTENT_ON)
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tags[i].persistent = MICRODVD_PERSISTENT_OPENED;
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}
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}
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static void microdvd_close_no_persistent_tags(AVBPrint *new_line,
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struct microdvd_tag *tags)
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{
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int i, sidx;
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for (i = sizeof(MICRODVD_TAGS) - 2; i >= 0; i--) {
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if (tags[i].persistent != MICRODVD_PERSISTENT_OFF)
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continue;
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switch (tags[i].key) {
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case 'y':
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for (sidx = sizeof(MICRODVD_STYLES) - 2; sidx >= 0; sidx--)
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if (tags[i].data1 & (1 << sidx))
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av_bprintf(new_line, "{\\%c0}", MICRODVD_STYLES[sidx]);
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break;
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case 'c':
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av_bprintf(new_line, "{\\c}");
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break;
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case 'f':
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av_bprintf(new_line, "{\\fn}");
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break;
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case 's':
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av_bprintf(new_line, "{\\fs}");
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break;
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}
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tags[i].key = 0;
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}
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}
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static int microdvd_decode_frame(AVCodecContext *avctx, AVSubtitle *sub,
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int *got_sub_ptr, const AVPacket *avpkt)
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{
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AVBPrint new_line;
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char *line = avpkt->data;
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char *end = avpkt->data + avpkt->size;
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FFASSDecoderContext *s = avctx->priv_data;
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struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}};
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if (avpkt->size <= 0)
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return avpkt->size;
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av_bprint_init(&new_line, 0, 2048);
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// subtitle content
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while (line < end && *line) {
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// parse MicroDVD tags, and open them in ASS
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line = microdvd_load_tags(tags, line);
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microdvd_open_tags(&new_line, tags);
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// simple copy until EOL or forced carriage return
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while (line < end && *line && *line != '|') {
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av_bprint_chars(&new_line, *line, 1);
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line++;
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}
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// line split
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if (line < end && *line == '|') {
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microdvd_close_no_persistent_tags(&new_line, tags);
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av_bprintf(&new_line, "\\N");
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line++;
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}
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}
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if (new_line.len) {
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int ret = ff_ass_add_rect(sub, new_line.str, s->readorder++, 0, NULL, NULL);
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av_bprint_finalize(&new_line, NULL);
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if (ret < 0)
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return ret;
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}
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*got_sub_ptr = sub->num_rects > 0;
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return avpkt->size;
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}
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static int microdvd_init(AVCodecContext *avctx)
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{
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int i, sidx;
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AVBPrint font_buf;
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int font_size = ASS_DEFAULT_FONT_SIZE;
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int color = ASS_DEFAULT_COLOR;
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int bold = ASS_DEFAULT_BOLD;
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int italic = ASS_DEFAULT_ITALIC;
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int underline = ASS_DEFAULT_UNDERLINE;
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int alignment = ASS_DEFAULT_ALIGNMENT;
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struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}};
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av_bprint_init(&font_buf, 0, AV_BPRINT_SIZE_AUTOMATIC);
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av_bprintf(&font_buf, "%s", ASS_DEFAULT_FONT);
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if (avctx->extradata) {
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microdvd_load_tags(tags, avctx->extradata);
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for (i = 0; i < sizeof(MICRODVD_TAGS) - 1; i++) {
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switch (av_tolower(tags[i].key)) {
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case 'y':
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for (sidx = 0; sidx < sizeof(MICRODVD_STYLES) - 1; sidx++) {
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if (tags[i].data1 & (1 << sidx)) {
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switch (MICRODVD_STYLES[sidx]) {
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case 'i': italic = 1; break;
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case 'b': bold = 1; break;
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case 'u': underline = 1; break;
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}
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}
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}
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break;
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case 'c': color = tags[i].data1; break;
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case 's': font_size = tags[i].data1; break;
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case 'p': alignment = 8; break;
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case 'f':
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av_bprint_clear(&font_buf);
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av_bprintf(&font_buf, "%.*s",
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tags[i].data_string_len, tags[i].data_string);
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break;
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}
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}
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}
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return ff_ass_subtitle_header(avctx, font_buf.str, font_size, color,
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ASS_DEFAULT_BACK_COLOR, bold, italic,
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underline, ASS_DEFAULT_BORDERSTYLE,
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alignment);
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}
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const FFCodec ff_microdvd_decoder = {
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.p.name = "microdvd",
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.p.long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle"),
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.p.type = AVMEDIA_TYPE_SUBTITLE,
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.p.id = AV_CODEC_ID_MICRODVD,
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.init = microdvd_init,
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FF_CODEC_DECODE_SUB_CB(microdvd_decode_frame),
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.flush = ff_ass_decoder_flush,
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.priv_data_size = sizeof(FFASSDecoderContext),
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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