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mpv/sub/sd_microdvd.c

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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 <libavutil/common.h>
#include "common/msg.h"
#include "misc/bstr.h"
#include "sd.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;
}
/*
* 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;
}
}
static void convert_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;
}
static const char *const microdvd_ass_extradata =
"[Script Info]\n"
"ScriptType: v4.00+\n"
"PlayResX: 384\n"
"PlayResY: 288\n";
static bool supports_format(const char *format)
{
return format && strcmp(format, "microdvd") == 0;
}
static int init(struct sd *sd)
{
sd->output_codec = "ass-text";
sd->output_extradata = (char *)microdvd_ass_extradata;
sd->output_extradata_len = strlen(sd->output_extradata);
return 0;
}
static void decode(struct sd *sd, struct demux_packet *packet)
{
char dest[SD_MAX_LINE_LEN];
// Assume input buffer is padded with 0
convert_microdvd(packet->buffer, dest, sizeof(dest));
sd_conv_add_packet(sd, dest, strlen(dest), packet->pts, packet->duration);
}
const struct sd_functions sd_microdvd = {
.name = "microdvd",
.supports_format = supports_format,
.init = init,
.decode = decode,
.get_converted = sd_conv_def_get_converted,
.reset = sd_conv_def_reset,
};
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