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mpv/sub/subassconvert.c
Stefano Pigozzi fea9ea33b2 subassconverter: correctly handle RRGGBB and unknow formats 
The following HEX formats are now parsed correctly: `#RRGGBB`, `RRGGBB`.

Moreover this implementation doesn't show the HTML on screen if the input
color is not recognized. A warning is still displayed in the terminal.
2012-11-25 23:47:57 +01:00

547 lines
16 KiB
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/*
* Subtitles converter to SSA/ASS in order to allow special formatting
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
#include "core/mp_msg.h"
#include "subassconvert.h"
#include "core/bstr.h"
#include "libavutil/common.h"
struct line {
char *buf;
int bufsize;
int len;
};
#ifdef __GNUC__
static void append_text(struct line *dst, char *fmt, ...) __attribute__ ((format(printf, 2, 3)));
#endif
static void append_text(struct line *dst, char *fmt, ...)
{
va_list va;
va_start(va, fmt);
int ret = vsnprintf(dst->buf + dst->len, dst->bufsize - dst->len, fmt, va);
if (ret < 0)
goto out;
dst->len += ret;
if (dst->len > dst->bufsize)
dst->len = dst->bufsize;
out:
va_end(va);
}
static int indexof(const char *s, int c)
{
char *f = strchr(s, c);
return f ? (f - s) : -1;
}
/*
* SubRip
*
* Support basic tags (italic, bold, underline, strike-through)
* and font tag with size, color and face attributes.
*
*/
struct font_tag {
int size;
uint32_t color;
struct bstr face;
bool has_size : 1;
bool has_color : 1;
bool has_face : 1;
};
static const struct tag_conv {
char *from;
char *to;
} subrip_basic_tags[] = {
{"<i>", "{\\i1}"}, {"</i>", "{\\i0}"},
{"<b>", "{\\b1}"}, {"</b>", "{\\b0}"},
{"<u>", "{\\u1}"}, {"</u>", "{\\u0}"},
{"<s>", "{\\s1}"}, {"</s>", "{\\s0}"},
{"{", "\\{"}, {"}", "\\}"},
{"\r\n", "\\N"}, {"\n", "\\N"}, {"\r", "\\N"},
};
static const struct {
char *s;
uint32_t v;
} subrip_web_colors[] = {
/* Named CSS3 colors in BGR format; a subset of those
at http://www.w3.org/TR/css3-color/#svg-color */
{"aqua", 0xffff00},
{"black", 0x000000},
{"blue", 0xff0000},
{"cyan", 0xffff00},
{"fuchsia", 0xff00ff},
{"gray", 0x808080},
{"green", 0x008000},
{"grey", 0x808080},
{"lime", 0x00ff00},
{"magenta", 0xff00ff},
{"maroon", 0x000080},
{"navy", 0x800000},
{"olive", 0x008080},
{"orange", 0x00a5ff},
{"pink", 0xcbc0ff},
{"purple", 0x800080},
{"red", 0x0000ff},
{"silver", 0xc0c0c0},
{"teal", 0x808000},
{"white", 0xffffff},
{"yellow", 0x00ffff},
};
#define SUBRIP_MAX_STACKED_FONT_TAGS 16
/* Read the HTML-style attribute starting at *s, and skip *s past the value.
* Set attr and val to the parsed attribute name and value.
* Return 0 on success, or -1 if no valid attribute was found.
*/
static int read_attr(char **s, struct bstr *attr, struct bstr *val)
{
char *eq = strchr(*s, '=');
if (!eq)
return -1;
attr->start = *s;
attr->len = eq - *s;
for (int i = 0; i < attr->len; i++)
if (!isalnum(attr->start[i]))
return -1;
val->start = eq + 1;
bool quoted = val->start[0] == '"';
if (quoted)
val->start++;
unsigned char *end = strpbrk(val->start, quoted ? "\"" : " >");
if (!end)
return -1;
val->len = end - val->start;
*s = end + quoted;
return 0;
}
void subassconvert_subrip(const char *orig, char *dest, int dest_buffer_size)
{
/* line is not const to avoid warnings with strtol, etc.
* orig content won't be changed */
char *line = (char *)orig;
struct line new_line = {
.buf = dest,
.bufsize = dest_buffer_size,
};
struct font_tag font_stack[SUBRIP_MAX_STACKED_FONT_TAGS + 1];
font_stack[0] = (struct font_tag){0}; // type with all defaults
int sp = 0;
while (*line && new_line.len < new_line.bufsize - 1) {
char *orig_line = line;
for (int i = 0; i < FF_ARRAY_ELEMS(subrip_basic_tags); i++) {
const struct tag_conv *tag = &subrip_basic_tags[i];
int from_len = strlen(tag->from);
if (strncmp(line, tag->from, from_len) == 0) {
append_text(&new_line, "%s", tag->to);
line += from_len;
}
}
if (strncmp(line, "</font>", 7) == 0) {
/* Closing font tag */
line += 7;
if (sp > 0) {
struct font_tag *tag = &font_stack[sp];
struct font_tag *last_tag = &tag[-1];
sp--;
if (tag->has_size) {
if (!last_tag->has_size)
append_text(&new_line, "{\\fs}");
else if (last_tag->size != tag->size)
append_text(&new_line, "{\\fs%d}", last_tag->size);
}
if (tag->has_color) {
if (!last_tag->has_color)
append_text(&new_line, "{\\c}");
else if (last_tag->color != tag->color)
append_text(&new_line, "{\\c&H%06X&}", last_tag->color);
}
if (tag->has_face) {
if (!last_tag->has_face)
append_text(&new_line, "{\\fn}");
else if (bstrcmp(last_tag->face, tag->face) != 0)
append_text(&new_line, "{\\fn%.*s}",
BSTR_P(last_tag->face));
}
}
} else if (strncmp(line, "<font ", 6) == 0
&& sp + 1 < FF_ARRAY_ELEMS(font_stack)) {
/* Opening font tag */
char *potential_font_tag_start = line;
int len_backup = new_line.len;
struct font_tag *tag = &font_stack[sp + 1];
bool has_valid_attr = false;
*tag = tag[-1]; // keep values from previous tag
line += 6;
while (*line && *line != '>') {
if (*line == ' ') {
line++;
continue;
}
struct bstr attr, val;
if (read_attr(&line, &attr, &val) < 0)
break;
if (!bstrcmp0(attr, "size")) {
tag->size = bstrtoll(val, &val, 10);
if (val.len)
break;
append_text(&new_line, "{\\fs%d}", tag->size);
tag->has_size = true;
has_valid_attr = true;
} else if (!bstrcmp0(attr, "color")) {
int found = 0;
// Try to lookup the string in standard web colors
for (int i = 0; i < FF_ARRAY_ELEMS(subrip_web_colors); i++) {
char *color = subrip_web_colors[i].s;
if (bstrcasecmp(val, bstr0(color)) == 0) {
tag->color = subrip_web_colors[i].v;
found = 1;
}
}
// If it's not a web color it must be a HEX RGB value
if (!found) {
// Remove the leading '#'
bstr_eatstart(&val, bstr0("#"));
// Parse RRGGBB format
tag->color = bstrtoll(val, &val, 16) & 0x00ffffff;
if (!val.len) {
tag->color = ((tag->color & 0xff) << 16)
| (tag->color & 0xff00)
| ((tag->color & 0xff0000) >> 16);
found = 1;
}
}
if (found) {
append_text(&new_line, "{\\c&H%06X&}", tag->color);
tag->has_color = true;
} else {
// We didn't find any matching color
mp_tmsg(MSGT_SUBREADER, MSGL_WARN,
"SubRip: unknown font color in subtitle: %s\n",
orig);
append_text(&new_line, "{\\c}");
}
has_valid_attr = true;
} else if (!bstrcmp0(attr, "face")) {
/* Font face attribute */
tag->face = val;
append_text(&new_line, "{\\fn%.*s}", BSTR_P(tag->face));
tag->has_face = true;
has_valid_attr = true;
} else
mp_tmsg(MSGT_SUBREADER, MSGL_WARN,"SubRip: unrecognized "
"attribute \"%.*s\" in font tag\n", BSTR_P(attr));
}
if (!has_valid_attr || *line != '>') { /* Not valid font tag */
line = potential_font_tag_start;
new_line.len = len_backup;
} else {
sp++;
line++;
}
}
/* Tag conversion code didn't match */
if (line == orig_line)
new_line.buf[new_line.len++] = *line++;
}
new_line.buf[new_line.len] = 0;
}
/*
* MicroDVD
*
* Based on the specifications found here:
* https://trac.videolan.org/vlc/ticket/1825#comment:6
*/
struct microdvd_tag {
char key;
int persistent;
uint32_t data1;
uint32_t data2;
struct bstr data_string;
};
#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"
static char *microdvd_load_tags(struct microdvd_tag *tags, char *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 != '}') {
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':
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.start = 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.start = s;
tag.data_string.len = len;
s += len;
tag.key = 'h';
break;
}
/* Position */
case 'P':
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 to be text */
break;
}
if (tag.key == 0)
return start;
microdvd_set_tag(tags, tag);
s++;
}
return s;
}
static void microdvd_open_tags(struct line *new_line, struct microdvd_tag *tags)
{
for (int 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 (int sidx = 0; sidx < sizeof(MICRODVD_STYLES) - 1; sidx++)
if (tags[i].data1 & (1 << sidx))
append_text(new_line, "{\\%c1}", MICRODVD_STYLES[sidx]);
break;
case 'c':
append_text(new_line, "{\\c&H%06X&}", tags[i].data1);
break;
case 'f':
append_text(new_line, "{\\fn%.*s}", BSTR_P(tags[i].data_string));
break;
case 's':
append_text(new_line, "{\\fs%d}", tags[i].data1);
break;
case 'p':
if (tags[i].data1 == 0)
append_text(new_line, "{\\an8}");
break;
case 'o':
append_text(new_line, "{\\pos(%d,%d)}",
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(struct line *new_line,
struct microdvd_tag *tags)
{
int i;
for (i = sizeof(MICRODVD_TAGS) - 2; i; i--) {
if (tags[i].persistent != MICRODVD_PERSISTENT_OFF)
continue;
switch (tags[i].key) {
case 'y':
for (int sidx = sizeof(MICRODVD_STYLES) - 2; sidx >= 0; sidx--)
if (tags[i].data1 & (1 << sidx))
append_text(new_line, "{\\%c0}", MICRODVD_STYLES[sidx]);
break;
case 'c':
append_text(new_line, "{\\c}");
break;
case 'f':
append_text(new_line, "{\\fn}");
break;
case 's':
append_text(new_line, "{\\fs}");
break;
}
tags[i].key = 0;
}
}
void subassconvert_microdvd(const char *orig, char *dest, int dest_buffer_size)
{
/* line is not const to avoid warnings with strtol, etc.
* orig content won't be changed */
char *line = (char *)orig;
struct line new_line = {
.buf = dest,
.bufsize = dest_buffer_size,
};
struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}};
while (*line) {
line = microdvd_load_tags(tags, line);
microdvd_open_tags(&new_line, tags);
while (*line && *line != '|')
new_line.buf[new_line.len++] = *line++;
if (*line == '|') {
microdvd_close_no_persistent_tags(&new_line, tags);
append_text(&new_line, "\\N");
line++;
}
}
new_line.buf[new_line.len] = 0;
}
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