mirror of
https://github.com/mpv-player/mpv
synced 2024-12-27 01:22:30 +00:00
f3871193fc
Both converters can output \pos and deal with font sizes, so they assume a specific script resolution (PlayResX/PlayResY). The implicit assumption was that a specific resolution was guaranteed. The MP_ASS_FONT_PLAYRESY constant is connected to this. Better make it explicit, so that the implicit dependency on MP_ASS_FONT_PLAYRESY is removed. (Unfortunately, libavcodec sub converters still don't set PlayResX/PlayResY explicitly, so the value set by that constant can't be declared as arbitrary yet.) PlayResY=288 is most likely the SSA natural script resolution (or something like this?), as well as the libass and VSFilter default. PlayResX=384 is the fallback value set by libass if PlayResY is set to 288, and PlayResX is unset.
347 lines
9.0 KiB
C
347 lines
9.0 KiB
C
/*
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* Subtitles converter to SSA/ASS in order to allow special formatting
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <string.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <ctype.h>
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#include <libavutil/common.h>
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#include "core/mp_msg.h"
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#include "core/bstr.h"
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#include "sd.h"
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struct line {
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char *buf;
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int bufsize;
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int len;
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};
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#ifdef __GNUC__
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static void append_text(struct line *dst, char *fmt, ...) __attribute__ ((format(printf, 2, 3)));
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#endif
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static void append_text(struct line *dst, char *fmt, ...)
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{
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va_list va;
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va_start(va, fmt);
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int ret = vsnprintf(dst->buf + dst->len, dst->bufsize - dst->len, fmt, va);
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if (ret < 0)
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goto out;
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dst->len += ret;
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if (dst->len > dst->bufsize)
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dst->len = dst->bufsize;
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out:
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va_end(va);
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}
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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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/*
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* MicroDVD
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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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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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struct bstr data_string;
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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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static char *microdvd_load_tags(struct microdvd_tag *tags, char *s)
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{
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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 != '}') {
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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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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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{
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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.start = 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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{
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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.start = 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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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 to be 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 s;
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}
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static void microdvd_open_tags(struct line *new_line, struct microdvd_tag *tags)
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{
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for (int 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 (int sidx = 0; sidx < sizeof(MICRODVD_STYLES) - 1; sidx++)
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if (tags[i].data1 & (1 << sidx))
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append_text(new_line, "{\\%c1}", MICRODVD_STYLES[sidx]);
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break;
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case 'c':
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append_text(new_line, "{\\c&H%06X&}", tags[i].data1);
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break;
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case 'f':
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append_text(new_line, "{\\fn%.*s}", BSTR_P(tags[i].data_string));
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break;
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case 's':
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append_text(new_line, "{\\fs%d}", 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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append_text(new_line, "{\\an8}");
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break;
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case 'o':
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append_text(new_line, "{\\pos(%d,%d)}",
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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(struct line *new_line,
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struct microdvd_tag *tags)
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{
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int i;
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for (i = sizeof(MICRODVD_TAGS) - 2; i; 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 (int sidx = sizeof(MICRODVD_STYLES) - 2; sidx >= 0; sidx--)
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if (tags[i].data1 & (1 << sidx))
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append_text(new_line, "{\\%c0}", MICRODVD_STYLES[sidx]);
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break;
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case 'c':
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append_text(new_line, "{\\c}");
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break;
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case 'f':
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append_text(new_line, "{\\fn}");
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break;
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case 's':
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append_text(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 void convert_microdvd(const char *orig, char *dest, int dest_buffer_size)
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{
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/* line is not const to avoid warnings with strtol, etc.
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* orig content won't be changed */
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char *line = (char *)orig;
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struct line new_line = {
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.buf = dest,
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.bufsize = dest_buffer_size,
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};
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struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}};
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while (*line) {
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line = microdvd_load_tags(tags, line);
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microdvd_open_tags(&new_line, tags);
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while (*line && *line != '|')
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new_line.buf[new_line.len++] = *line++;
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if (*line == '|') {
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microdvd_close_no_persistent_tags(&new_line, tags);
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append_text(&new_line, "\\N");
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line++;
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}
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}
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new_line.buf[new_line.len] = 0;
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}
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static const char *microdvd_ass_extradata =
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"[Script Info]\n"
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"ScriptType: v4.00+\n"
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"PlayResX: 384\n"
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"PlayResY: 288\n";
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static bool supports_format(const char *format)
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{
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return format && strcmp(format, "microdvd") == 0;
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}
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static int init(struct sd *sd)
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{
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sd->output_codec = "ass-text";
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sd->output_extradata = (char *)microdvd_ass_extradata;
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sd->output_extradata_len = strlen(sd->output_extradata);
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return 0;
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}
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static void decode(struct sd *sd, struct demux_packet *packet)
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{
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char dest[SD_MAX_LINE_LEN];
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// Assume input buffer is padded with 0
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convert_microdvd(packet->buffer, dest, sizeof(dest));
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sd_conv_add_packet(sd, dest, strlen(dest), packet->pts, packet->duration);
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}
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const struct sd_functions sd_microdvd = {
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.name = "microdvd",
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.supports_format = supports_format,
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.init = init,
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.decode = decode,
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.get_converted = sd_conv_def_get_converted,
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.reset = sd_conv_def_reset,
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};
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