gstreamer/gst/xdgmime/gstxdgmime.c

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/* GStreamer
* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gst/gst.h>
#include "xdgmime/xdgmime.h"
GST_DEBUG_CATEGORY (xdgmime_debug);
#define GST_CAT_DEFAULT xdgmime_debug
#if GLIB_CHECK_VERSION (2, 16, 0)
#include <gio/gio.h>
#else
G_LOCK_DEFINE_STATIC (xdg_lock);
#endif
static void
xdgmime_typefind (GstTypeFind * find, gpointer user_data)
{
gchar *mimetype;
gsize length = 16384;
guint64 tf_length;
guint8 *data;
if ((tf_length = gst_type_find_get_length (find)) > 0)
length = MIN (length, tf_length);
if ((data = gst_type_find_peek (find, 0, length)) == NULL)
return;
#if GLIB_CHECK_VERSION (2, 16, 0)
{
gchar *tmp;
tmp = g_content_type_guess (NULL, data, length, NULL);
if (tmp == NULL || g_content_type_is_unknown (tmp)) {
g_free (tmp);
return;
}
mimetype = g_content_type_get_mime_type (tmp);
g_free (tmp);
if (mimetype == NULL)
return;
GST_DEBUG ("Got mimetype '%s'", mimetype);
}
#else
{
const gchar *tmp;
gint prio;
/* FIXME: xdg-mime is not thread-safe as it stores the cache globally
* and updates it from every call if changes were done without
* any locking
*/
G_LOCK (xdg_lock);
tmp = xdg_mime_get_mime_type_for_data (data, length, &prio);
G_UNLOCK (xdg_lock);
if (tmp == NULL || g_str_equal (tmp, XDG_MIME_TYPE_UNKNOWN))
return;
GST_DEBUG ("Got mimetype '%s' with prio %d", tmp, prio);
mimetype = g_strdup (tmp);
}
#endif
/* Ignore audio/video types:
* - our own typefinders in -base are likely to be better at this
* (and if they're not, we really want to fix them, that's why we don't
* report xdg-detected audio/video types at all, not even with a low
* probability)
* - we want to detect GStreamer media types and not MIME types
* - the purpose of this xdg mime finder is mainly to prevent false
* positives of non-media formats, not to typefind audio/video formats */
if (g_str_has_prefix (mimetype, "audio/") ||
g_str_has_prefix (mimetype, "video/")) {
GST_LOG ("Ignoring audio/video mime type");
g_free (mimetype);
return;
}
/* Again, we mainly want the xdg typefinding to prevent false-positives on
* non-media formats, so suggest the type with a probability that trumps
* uncertain results of our typefinders, but not more than that. */
GST_LOG ("Suggesting '%s' with probability POSSIBLE", mimetype);
gst_type_find_suggest_simple (find, GST_TYPE_FIND_POSSIBLE, mimetype, NULL);
g_free (mimetype);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GstCaps *caps = NULL;
guint major, minor, micro, nano;
gboolean ret;
/* FIXME: GStreamer before 0.10.22.1 produced assertions
* when storing typefind factories with NULL caps */
gst_version (&major, &minor, &micro, &nano);
if (major <= 0 && minor <= 10 && micro <= 22 && nano <= 0)
caps = gst_caps_new_empty ();
GST_DEBUG_CATEGORY_INIT (xdgmime_debug, "xdgmime", 0, "XDG-MIME");
ret = gst_type_find_register (plugin,
"xdgmime", GST_RANK_MARGINAL, xdgmime_typefind, NULL, caps, NULL, NULL);
if (caps)
gst_caps_unref (caps);
return ret;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"xdgmime",
"XDG-MIME",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)