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typefind: add detection for windows icon files to get them out of the way
Some of them can otherwise be misdetected for MPEG audio. https://bugzilla.gnome.org/show_bug.cgi?id=620364
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@ -3869,6 +3869,48 @@ xdgmime_typefind (GstTypeFind * find, gpointer user_data)
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}
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#endif /* USE_GIO */
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/*** Windows icon typefinder (to avoid false positives mostly) ***/
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static void
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windows_icon_typefind (GstTypeFind * find, gpointer user_data)
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{
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guint8 *data;
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gint64 datalen;
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guint16 type, nimages;
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gint32 size, offset;
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datalen = gst_type_find_get_length (find);
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if ((data = gst_type_find_peek (find, 0, 6)) == NULL)
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return;
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/* header - simple and not enough to rely on it alone */
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if (GST_READ_UINT16_LE (data) != 0)
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return;
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type = GST_READ_UINT16_LE (data + 2);
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if (type != 1 && type != 2)
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return;
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nimages = GST_READ_UINT16_LE (data + 4);
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if (nimages == 0) /* we can assume we can't have an empty image file ? */
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return;
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/* first image */
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if (data[6 + 3] != 0)
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return;
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if (type == 1) {
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guint16 planes = GST_READ_UINT16_LE (data + 6 + 4);
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if (planes > 1)
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return;
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}
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size = GST_READ_UINT32_LE (data + 6 + 8);
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offset = GST_READ_UINT32_LE (data + 6 + 12);
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if (offset < 0 || size <= 0 || size >= datalen || offset >= datalen
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|| size + offset > datalen)
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return;
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gst_type_find_suggest_simple (find, GST_TYPE_FIND_NEARLY_CERTAIN,
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"image/vnd.microsoft.icon", NULL);
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}
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/*** generic typefind for streams that have some data at a specific position***/
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typedef struct
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{
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@ -4332,6 +4374,8 @@ plugin_init (GstPlugin * plugin)
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GST_TYPE_FIND_LIKELY);
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TYPE_FIND_REGISTER_START_WITH (plugin, "application/x-yuv4mpeg",
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GST_RANK_SECONDARY, y4m_exts, "YUV4MPEG2 ", 10, GST_TYPE_FIND_LIKELY);
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TYPE_FIND_REGISTER (plugin, "image/vnd.microsoft.icon", GST_RANK_MARGINAL,
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windows_icon_typefind, NULL, NULL, NULL, NULL);
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#ifdef USE_GIO
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TYPE_FIND_REGISTER (plugin, "xdgmime-base", GST_RANK_MARGINAL,
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