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