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create colored teletext subs

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no dedicated configuration setting, since if color is not needed/wanted,
~all playback software that support colored subs allow to override it.
And playback software that doesn't support colored subs just will ignore
the font-tags.
This commit is contained in:
Christian Lohmaier 2014-10-13 20:11:33 +02:00 • committed by Jaroslav Kysela
parent dc5d042522
commit cef28a6c9e
1 changed files with 43 additions and 4 deletions
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47
src/parsers/parser_teletext.c
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@ -481,6 +481,19 @@ hebrew_g0[37] = {
/* 0x78 */ 0x05E8, 0x05E9, 0x05EA, 0x20AA, 0x2016, 0x00BE, 0x00F7, 0x25A0
};
static const uint8_t* COLOR_MAP[8] = {
// black (grey for visibility), red, green, yellow, blue, magenta, cyan, white
(uint8_t*) "<font color=\"#888888\">",
(uint8_t*) "<font color=\"#ff0000\">",
(uint8_t*) "<font color=\"#00ff00\">",
(uint8_t*) "<font color=\"#ffff00\">",
(uint8_t*) "<font color=\"#0000ff\">",
(uint8_t*) "<font color=\"#ff00ff\">",
(uint8_t*) "<font color=\"#00ffff\">",
(uint8_t*) "<font color=\"#ffffff\">"
};
static const uint8_t* CLOSE_FONT = (uint8_t*) "</font>";
/**
* cs Teletext character set as listed in ETS 300 706 section 15.
* ss National character subset as listed in section 15, only
@ -686,16 +699,18 @@ extract_subtitle(mpegts_service_t *t, elementary_stream_t *st,
tt_mag_t *ttm, int64_t pts)
{
int i, j, start, off = 0;
int k, current_color, is_font_tag_open, use_color_subs = 1;
uint8_t sub[2000];
uint8_t *cset, ch;
int is_box = 0;
uint8_t first = 0;
if ((cset = get_cset((ttm->ttm_charset[0] & ~7) + ttm->ttm_national)) == NULL)
if ((cset = get_cset(ttm->ttm_charset[0])) == NULL)
cset = char_table[0]; /* fallback */
for (i = 0; i < 23; i++) {
is_font_tag_open = 0;
current_color = 7; /* white = default */
start = off;
for (j = 0; j < 40; j++) {
@ -703,6 +718,26 @@ extract_subtitle(mpegts_service_t *t, elementary_stream_t *st,
switch(ch) {
case 0 ... 7:
if (use_color_subs) {
if (ch != current_color) {
if (is_font_tag_open) {
for (k = 0; k < 7; k++) {
if (off < sizeof(sub))
sub[off++] = CLOSE_FONT[k];
}
is_font_tag_open = 0;
}
/* no need for font-tag for default-color */
if (ch != 7) {
for (k = 0; k < 22; k++) {
if (off < sizeof(sub))
sub[off++] = COLOR_MAP[ch][k];
}
is_font_tag_open = 1;
}
current_color = ch;
}
}
break;
case 0x0a:
@ -716,9 +751,6 @@ extract_subtitle(mpegts_service_t *t, elementary_stream_t *st,
default:
if (ch >= 0x20 && is_box && (start != off || ch > 0x20)) {
if (!first)
first = ch;
uint16_t ucs2 = teletext_to_ucs2(cset[0], cset[2], ch);
/* ucs2 -> utf8 conversion */
@ -743,6 +775,13 @@ extract_subtitle(mpegts_service_t *t, elementary_stream_t *st,
}
}
}
if (use_color_subs && is_font_tag_open) {
for (k = 0; k < 7; k++) {
if (off < sizeof(sub))
sub[off++] = CLOSE_FONT[k];
}
is_font_tag_open = 0;
}
if(start != off && off < sizeof(sub))
sub[off++] = '\n';
}