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typefinding: add typefinder for WAP WBMP bitmaps

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=651294
This commit is contained in:
Tim-Philipp Müller 2011-06-02 00:55:41 +01:00
parent 5c97aa2e5c
commit d10a7b439b
1 changed files with 57 additions and 0 deletions
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57
gst/typefind/gsttypefindfunctions.c
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@ -4007,6 +4007,61 @@ windows_icon_typefind (GstTypeFind * find, gpointer user_data)
"image/x-icon", NULL);
}
/*** WAP WBMP typefinder ***/
static void
wbmp_typefind (GstTypeFind * find, gpointer user_data)
{
guint8 *data;
gint64 datalen;
guint w, h, size;
/* http://en.wikipedia.org/wiki/Wireless_Application_Protocol_Bitmap_Format */
datalen = gst_type_find_get_length (find);
if (datalen == 0)
return;
data = gst_type_find_peek (find, 0, 5);
if (data == NULL)
return;
/* want 0x00 0x00 at start */
if (*data++ != 0 || *data++ != 0)
return;
/* min header size */
size = 4;
/* let's assume max width/height is 65536 */
w = *data++;
if ((w & 0x80)) {
w = (w << 8) | *data++;
if ((w & 0x80))
return;
++size;
data = gst_type_find_peek (find, 4, 2);
if (data == NULL)
return;
}
h = *data++;
if ((h & 0x80)) {
h = (h << 8) | *data++;
if ((h & 0x80))
return;
++size;
}
if (w == 0 || h == 0)
return;
/* now add bitmap size */
size += h * (GST_ROUND_UP_8 (w) / 8);
if (datalen == size) {
gst_type_find_suggest_simple (find, GST_TYPE_FIND_POSSIBLE - 10,
"image/vnd.wap.wbmp", NULL);
}
}
/*** DEGAS Atari images (also to avoid false positives, see #625129) ***/
static void
@ -4522,6 +4577,8 @@ plugin_init (GstPlugin * plugin)
TYPE_FIND_REGISTER_START_WITH (plugin, "image/vnd.adobe.photoshop",
GST_RANK_SECONDARY, psd_exts, "8BPS\000\001\000\000\000\000", 10,
GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER (plugin, "image/vnd.wap.wbmp", GST_RANK_MARGINAL,
wbmp_typefind, NULL, NULL, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/x-yuv4mpeg",
GST_RANK_SECONDARY, y4m_exts, "YUV4MPEG2 ", 10, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER (plugin, "image/x-icon", GST_RANK_MARGINAL,