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typefind: add typefinder for Apple/iTunes itc artwork files

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Avoids audio/mpeg false-positive described at:

https://bugzilla.gnome.org/show_bug.cgi?id=773172
This commit is contained in:
Reynaldo H. Verdejo Pinochet 2016-10-18 16:18:19 -07:00
parent 90b24d34b3
commit 7e14875458
1 changed files with 63 additions and 0 deletions
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63
gst/typefind/gsttypefindfunctions.c
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@ -422,6 +422,67 @@ uri_type_find (GstTypeFind * tf, gpointer unused)
}
}
/*** application/itc ***/
static GstStaticCaps itc_caps = GST_STATIC_CAPS ("application/itc");
#define ITC_CAPS (gst_static_caps_get(&itc_caps))
static void
itc_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
guint8 magic[8] = { 0x00, 0x00, 0x01, 0x1C, 0x69, 0x74, 0x63, 0x68 };
guint8 preamble[4] = { 0x00, 0x00, 0x00, 0x02 };
guint8 artwork_marker[8] = { 0x00, 0x00, 0x00, 0x00, 0x61, 0x72, 0x74, 0x77 };
GstTypeFindProbability itc_prob = GST_TYPE_FIND_NONE;
int i;
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 8)))
return;
if (memcmp (c.data, magic, 8))
return;
/* At least we found the right magic */
itc_prob = GST_TYPE_FIND_MINIMUM;
data_scan_ctx_advance (tf, &c, 8);
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 12)))
goto done;
/* Check preamble 3 consecutive times */
for (i = 0; i < 3; i++) {
if (memcmp (c.data, preamble, 4))
goto done;
data_scan_ctx_advance (tf, &c, 4);
}
itc_prob = GST_TYPE_FIND_POSSIBLE;
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 8)))
goto done;
/* Look for "artw" marker */
if (memcmp (c.data, artwork_marker, 8))
goto done;
itc_prob = GST_TYPE_FIND_LIKELY;
data_scan_ctx_advance (tf, &c, 8);
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 256)))
goto done;
/* ...and 256 0x00 padding bytes on what looks like the header's end */
for (i = 0; i < 256; i++) {
if (c.data[i])
goto done;
}
itc_prob = GST_TYPE_FIND_NEARLY_CERTAIN;
done:
gst_type_find_suggest (tf, itc_prob, ITC_CAPS);
}
/*** application/x-hls ***/
static GstStaticCaps hls_caps = GST_STATIC_CAPS ("application/x-hls");
@ -5683,6 +5744,8 @@ plugin_init (GstPlugin * plugin)
"txt", UTF32_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "text/uri-list", GST_RANK_MARGINAL, uri_type_find,
"ram", URI_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/itc", GST_RANK_SECONDARY,
itc_type_find, "itc", ITC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-hls", GST_RANK_MARGINAL,
hls_type_find, "m3u8", HLS_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/sdp", GST_RANK_SECONDARY,