gstreamer/subprojects/gst-plugins-base/gst/gio/gstgioelement.c

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/* GStreamer
*
* Copyright (C) 2007 Rene Stadler <mail@renestadler.de>
* Copyright (C) 2007 Sebastian Dröge <sebastian.droege@collabora.co.uk>
* Copyright (C) 2020 Huawei Technologies Co., Ltd.
* @Author: Stéphane Cerveau <scerveau@collabora.com>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstgioelements.h"
GST_DEBUG_CATEGORY_STATIC (gst_gio_debug);
#define GST_CAT_DEFAULT gst_gio_debug
/* @func_name: Name of the GIO function, for debugging messages.
* @err: Error location. *err may be NULL, but err must be non-NULL.
* @ret: Flow return location. May be NULL. Is set to either #GST_FLOW_ERROR
* or #GST_FLOW_FLUSHING.
*
* Returns: TRUE to indicate a handled error. Error at given location err will
* be freed and *err will be set to NULL. A FALSE return indicates an unhandled
* error: The err location is unchanged and guaranteed to be != NULL. ret, if
* given, is set to GST_FLOW_ERROR.
*/
gboolean
gst_gio_error (gpointer element, const gchar * func_name, GError ** err,
GstFlowReturn * ret)
{
gboolean handled = TRUE;
if (ret)
*ret = GST_FLOW_ERROR;
if (GST_GIO_ERROR_MATCHES (*err, CANCELLED)) {
GST_DEBUG_OBJECT (element, "blocking I/O call cancelled (%s)", func_name);
if (ret)
*ret = GST_FLOW_FLUSHING;
} else if (*err != NULL) {
handled = FALSE;
} else {
GST_ELEMENT_ERROR (element, LIBRARY, FAILED, (NULL),
("%s call failed without error set", func_name));
}
if (handled)
g_clear_error (err);
return handled;
}
GstFlowReturn
gst_gio_seek (gpointer element, GSeekable * stream, guint64 offset,
GCancellable * cancel)
{
gboolean success;
GstFlowReturn ret;
GError *err = NULL;
GST_LOG_OBJECT (element, "seeking to offset %" G_GINT64_FORMAT, offset);
success = g_seekable_seek (stream, offset, G_SEEK_SET, cancel, &err);
if (success)
ret = GST_FLOW_OK;
else if (!gst_gio_error (element, "g_seekable_seek", &err, &ret)) {
GST_ELEMENT_ERROR (element, RESOURCE, SEEK, (NULL),
("Could not seek: %s", err->message));
g_clear_error (&err);
}
return ret;
}
static gpointer
_internal_get_supported_protocols (gpointer data)
{
const gchar *const *schemes;
gchar **our_schemes;
guint num;
gint i, j;
schemes = g_vfs_get_supported_uri_schemes (g_vfs_get_default ());
if (schemes != NULL)
num = g_strv_length ((gchar **) schemes);
else
num = 0;
if (num == 0) {
GST_WARNING ("No GIO supported URI schemes found");
return NULL;
}
our_schemes = g_new0 (gchar *, num + 1);
/* - Filter http/https as we can't support the icy stuff with GIO.
* Use souphttpsrc if you need that.
* - Filter cdda as it doesn't support musicbrainz stuff and everything
* else one expects from a cdda source. Use cdparanoiasrc or cdiosrc
* for cdda.
*/
for (i = 0, j = 0; i < num; i++) {
if (strcmp (schemes[i], "http") == 0 || strcmp (schemes[i], "https") == 0
|| strcmp (schemes[i], "cdda") == 0)
continue;
our_schemes[j] = g_strdup (schemes[i]);
j++;
}
return our_schemes;
}
static gchar **
gst_gio_get_supported_protocols (void)
{
static GOnce once = G_ONCE_INIT;
g_once (&once, _internal_get_supported_protocols, NULL);
return (gchar **) once.retval;
}
static GstURIType
gst_gio_uri_handler_get_type_sink (GType type)
{
return GST_URI_SINK;
}
static GstURIType
gst_gio_uri_handler_get_type_src (GType type)
{
return GST_URI_SRC;
}
static const gchar *const *
gst_gio_uri_handler_get_protocols (GType type)
{
static const gchar *const *protocols = NULL;
if (!protocols)
protocols = (const gchar * const *) gst_gio_get_supported_protocols ();
return protocols;
}
static gchar *
gst_gio_uri_handler_get_uri (GstURIHandler * handler)
{
GstElement *element = GST_ELEMENT (handler);
gchar *uri;
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
g_object_get (G_OBJECT (element), "location", &uri, NULL);
return uri;
}
static gboolean
gst_gio_uri_handler_set_uri (GstURIHandler * handler, const gchar * uri,
GError ** error)
{
GstElement *element = GST_ELEMENT (handler);
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
if (GST_STATE (element) == GST_STATE_PLAYING ||
GST_STATE (element) == GST_STATE_PAUSED) {
g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_STATE,
"Changing the 'location' property while the element is running is "
"not supported");
return FALSE;
}
g_object_set (G_OBJECT (element), "location", uri, NULL);
return TRUE;
}
static void
gst_gio_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
gboolean sink = GPOINTER_TO_INT (iface_data); /* See in do_init below. */
if (sink)
iface->get_type = gst_gio_uri_handler_get_type_sink;
else
iface->get_type = gst_gio_uri_handler_get_type_src;
iface->get_protocols = gst_gio_uri_handler_get_protocols;
iface->get_uri = gst_gio_uri_handler_get_uri;
iface->set_uri = gst_gio_uri_handler_set_uri;
}
void
gst_gio_uri_handler_do_init (GType type)
{
GInterfaceInfo uri_handler_info = {
gst_gio_uri_handler_init,
NULL,
NULL
};
/* Store information for uri_handler_init to use for distinguishing the
* element types. This lets us use a single interface implementation for both
* classes. */
uri_handler_info.interface_data = GINT_TO_POINTER (g_type_is_a (type,
GST_TYPE_BASE_SINK));
g_type_add_interface_static (type, GST_TYPE_URI_HANDLER, &uri_handler_info);
}
#define GIO_GVFS_MOUNTS_DIR GIO_PREFIX \
G_DIR_SEPARATOR_S "share" \
G_DIR_SEPARATOR_S "gvfs" \
G_DIR_SEPARATOR_S "mounts"
void
gio_element_init (GstPlugin * plugin)
{
static gsize res = FALSE;
if (g_once_init_enter (&res)) {
GST_DEBUG_CATEGORY_INIT (gst_gio_debug, "gio", 0, "GIO elements");
gst_plugin_add_dependency_simple (plugin, NULL, GIO_MODULE_DIR, NULL,
GST_PLUGIN_DEPENDENCY_FLAG_NONE);
gst_plugin_add_dependency_simple (plugin, NULL, GIO_GVFS_MOUNTS_DIR, NULL,
GST_PLUGIN_DEPENDENCY_FLAG_NONE);
g_once_init_leave (&res, TRUE);
}
}