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Merge branch 'x-ttf-type-find' into 'main'

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Draft: gsttypefindfunctions: add a truetype font typefinder

Closes #2659

See merge request gstreamer/gstreamer!4836
This commit is contained in:
Fabián Orccón 2024-05-03 22:59:47 +00:00
parent 73c64e8182 725f00dbe7
commit 9ca4a0d1b8
1 changed files with 43 additions and 0 deletions
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43
subprojects/gst-plugins-base/gst/typefind/gsttypefindfunctions.c
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@ -424,6 +424,40 @@ uri_type_find (GstTypeFind * tf, gpointer unused)
}
}
/* There are 9 required tables in Truetype:
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6.html
* Check them, and if we get all 9, we have a TrueType font */
static GstStaticCaps ttf_caps = GST_STATIC_CAPS ("application/x-ttf");
#define TTF_CAPS (gst_static_caps_get(&ttf_caps))
static void
ttf_type_find (GstTypeFind * tf, gpointer unused)
{
static const char *table_names[] =
{ "cmap", "glyf", "head", "hhea", "hmtx", "loca", "maxp", "name",
"post"
};
const guint8 *data = NULL, *ptr;
const size_t len = 1024;
size_t n;
guint32 found = 0;
data = gst_type_find_peek (tf, 0, len);
if (!data)
return;
for (ptr = data; ptr < data + len - 4; ++ptr) {
for (n = 0; n < G_N_ELEMENTS (table_names); ++n) {
if (!memcmp (ptr, table_names[n], 4))
found |= 1 << n;
}
}
GST_DEBUG ("TTF tables found: %x", found);
if (found == 0x1ff)
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, TTF_CAPS);
}
/*** application/itc ***/
static GstStaticCaps itc_caps = GST_STATIC_CAPS ("application/itc");
#define ITC_CAPS (gst_static_caps_get(&itc_caps))
@ -6096,6 +6130,15 @@ GST_TYPE_FIND_REGISTER_DEFINE (utf32, "text/utf-32", GST_RANK_MARGINAL,
utf32_type_find, "txt", UTF32_CAPS, NULL, NULL);
GST_TYPE_FIND_REGISTER_DEFINE (uri, "text/uri-list", GST_RANK_MARGINAL,
uri_type_find, "ram", URI_CAPS, NULL, NULL);
GST_TYPE_FIND_REGISTER_DEFINE (plugin, "application/x-ttf", GST_RANK_PRIMARY,
ttf_type_find, "ttf", TTF_CAPS, NULL, NULL);
#if 0
GST_TYPE_FIND_REGISTER_START_WITH_DEFINE (plugin, "application/x-font-ttf",
GST_RANK_SECONDARY, "ttf", "\x00\x01\x00\x00\x00", 5,
GST_TYPE_FIND_LIKELY);
GST_TYPE_FIND_REGISTER_START_WITH_DEFINE (plugin, "application/x-font-otf",
GST_RANK_SECONDARY, "otf", "OTTO", 4, GST_TYPE_FIND_LIKELY);
#endif
GST_TYPE_FIND_REGISTER_DEFINE (itc, "application/itc", GST_RANK_SECONDARY,
itc_type_find, "itc", ITC_CAPS, NULL, NULL);
GST_TYPE_FIND_REGISTER_DEFINE (hls, "application/x-hls", GST_RANK_MARGINAL,