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discoverer: Add a signal to retrieve serialized GstDiscovererInfo

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This allows user to serialize the GstDiscovererInfo in other places
than the default folder, like a database when running web services for
examples.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3911>
This commit is contained in:
Thibault Saunier 2023-02-07 16:59:59 -03:00
parent 96e576a818
commit 9e994ea616
2 changed files with 73 additions and 21 deletions
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58
subprojects/gst-plugins-base/gst-libs/gst/pbutils/gstdiscoverer.c
View file

@ -172,6 +172,7 @@ enum
SIGNAL_STARTING,
SIGNAL_DISCOVERED,
SIGNAL_SOURCE_SETUP,
SIGNAL_LOAD_SERIALIZED_INFO,
LAST_SIGNAL
};
@ -215,6 +216,8 @@ static GVariant *gst_discoverer_info_to_variant_recurse (GstDiscovererStreamInfo
* sinfo, GstDiscovererSerializeFlags flags);
static GstDiscovererStreamInfo *_parse_discovery (GVariant * variant,
GstDiscovererInfo * info);
static GstDiscovererInfo *load_serialized_info (GstDiscoverer * dc,
gchar * uri);
static void
gst_discoverer_class_init (GstDiscovererClass * klass)
@ -227,6 +230,8 @@ gst_discoverer_class_init (GstDiscovererClass * klass)
gobject_class->set_property = gst_discoverer_set_property;
gobject_class->get_property = gst_discoverer_get_property;
klass->load_serialize_info = load_serialized_info;
/* properties */
/**
@ -323,6 +328,26 @@ gst_discoverer_class_init (GstDiscovererClass * klass)
g_signal_new ("source-setup", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDiscovererClass, source_setup),
NULL, NULL, NULL, G_TYPE_NONE, 1, GST_TYPE_ELEMENT);
/**
* GstDiscoverer::load-serialized-info:
* @discoverer: the #GstDiscoverer
* @uri: THe URI to load the serialized info for
*
* Retrieves information about a URI from and external source of information,
* like a cache file. This is used by the discoverer to speed up the
* discovery.
*
* Returns: (nullable) (transfer full): The #GstDiscovererInfo representing
* @uri, or %NULL if no information
*
* Since: 1.24
*/
gst_discoverer_signals[SIGNAL_LOAD_SERIALIZED_INFO] =
g_signal_new ("load-serialized-info", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDiscovererClass,
load_serialize_info), g_signal_accumulator_first_wins, NULL, NULL,
GST_TYPE_DISCOVERER_INFO, 1, G_TYPE_STRING);
}
static void
@ -1836,40 +1861,53 @@ _get_info_from_cachefile (GstDiscoverer * dc, gchar * cachefile)
return NULL;
}
static GstDiscovererInfo *
load_serialized_info (GstDiscoverer * dc, gchar * uri)
{
GstDiscovererInfo *res = NULL;
if (dc->priv->use_cache) {
gchar *cachefile = _serialized_info_get_path (dc, uri);
if (cachefile) {
res = _get_info_from_cachefile (dc, cachefile);
g_free (cachefile);
}
}
return res;
}
static gboolean
_setup_locked (GstDiscoverer * dc)
{
GstStateChangeReturn ret;
gchar *uri = (gchar *) dc->priv->pending_uris->data;
gchar *cachefile = NULL;
dc->priv->pending_uris =
g_list_delete_link (dc->priv->pending_uris, dc->priv->pending_uris);
if (dc->priv->use_cache) {
cachefile = _serialized_info_get_path (dc, uri);
if (cachefile)
dc->priv->current_info = _get_info_from_cachefile (dc, cachefile);
GST_DEBUG ("Setting up");
g_signal_emit (dc, gst_discoverer_signals[SIGNAL_LOAD_SERIALIZED_INFO], 0,
uri, &dc->priv->current_info);
if (dc->priv->current_info) {
/* Make sure the URI is exactly what the user passed in */
g_free (dc->priv->current_info->uri);
dc->priv->current_info->uri = uri;
dc->priv->current_info->cachefile = cachefile;
dc->priv->processing = FALSE;
dc->priv->target_state = GST_STATE_NULL;
return TRUE;
}
}
GST_DEBUG ("Setting up");
/* Pop URI off the pending URI list */
dc->priv->current_info =
(GstDiscovererInfo *) g_object_new (GST_TYPE_DISCOVERER_INFO, NULL);
dc->priv->current_info->cachefile = cachefile;
if (dc->priv->use_cache)
dc->priv->current_info->cachefile = _serialized_info_get_path (dc, uri);
dc->priv->current_info->uri = uri;
/* set uri on uridecodebin */

16
subprojects/gst-plugins-base/gst-libs/gst/pbutils/gstdiscoverer.h
View file

@ -386,8 +386,22 @@ struct _GstDiscovererClass {
const GError *err);
void (*source_setup) (GstDiscoverer *discoverer,
GstElement *source);
/**
* GstDiscovererClass::load_serialize_info:
* @dc: the #GstDiscoverer
* @uri: the uri to load the info from
*
* Loads the serialized info from the given uri.
*
* Returns: (transfer full): the #GstDiscovererInfo or %NULL if it could not be loaded
*
* Since: 1.24
*/
GstDiscovererInfo *
(*load_serialize_info) (GstDiscoverer *dc,
gchar *uri);
gpointer _reserved[GST_PADDING];
gpointer _reserved[GST_PADDING - 1];
};
GST_PBUTILS_API