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typefind: Add a typefinder for WebVTT files

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This commit is contained in:
Jan Schmidt 2016-02-26 02:58:26 +11:00
parent 468111ee49
commit ecb8d2e023
1 changed files with 37 additions and 0 deletions
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37
gst/typefind/gsttypefindfunctions.c
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@ -4615,6 +4615,41 @@ kate_type_find (GstTypeFind * tf, gpointer private)
}
}
/*** WEBVTTT subtitles ***/
static GstStaticCaps webvtt_caps =
GST_STATIC_CAPS ("application/x-subtitle-vtt, parsed=(boolean)false");
#define WEBVTT_CAPS (gst_static_caps_get(&webvtt_caps))
static void
webvtt_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data;
data = gst_type_find_peek (tf, 0, 9);
if (data == NULL)
return;
/* there might be a UTF-8 BOM at the beginning */
if (memcmp (data, "WEBVTT", 6) != 0 && memcmp (data + 3, "WEBVTT", 6) != 0) {
return;
}
if (data[0] != 'W') {
if (data[0] != 0xef || data[1] != 0xbb || data[2] != 0xbf)
return; /* Not a UTF-8 BOM */
data += 3;
}
/* After the WEBVTT magic must be one of these chars:
* 0x20 (space), 0x9 (tab), 0xa (LF) or 0xd (CR) */
if (data[6] != 0x20 && data[6] != 0x9 && data[6] != 0xa && data[6] != 0xd) {
return;
}
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, WEBVTT_CAPS);
}
/*** application/x-ogm-video or audio***/
static GstStaticCaps ogmvideo_caps =
@ -5737,6 +5772,8 @@ plugin_init (GstPlugin * plugin)
GST_RANK_SECONDARY, "Z", "\037\235", 2, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER (plugin, "subtitle/x-kate", GST_RANK_MARGINAL,
kate_type_find, NULL, NULL, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-subtitle-vtt", GST_RANK_MARGINAL,
webvtt_type_find, "vtt", WEBVTT_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-flac", GST_RANK_PRIMARY, flac_type_find,
"flac", FLAC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-vorbis", GST_RANK_PRIMARY,