uri-asset: Implement multi threading support

Making sure to have 1 GstDiscoverer per thread.

Use that new feature in gesdemux by loading the timeline directly from
the streaming thread. Modifying the timeline is not supported allowed
anyway.

ges/ges-uri-asset.c

@@ -42,7 +42,43 @@
 
 static GHashTable *parent_newparent_table = NULL;
 
-static GstDiscoverer *discoverer = NULL;
+G_LOCK_DEFINE_STATIC (discoverers_lock);
+static GstClockTime discovering_timeout = DEFAULT_DISCOVERY_TIMEOUT;
+static GHashTable *discoverers = NULL;  /* Thread ID -> GstDiscoverer */
+static void discoverer_discovered_cb (GstDiscoverer * discoverer,
+    GstDiscovererInfo * info, GError * err, gpointer user_data);
+
+/* WITH discoverers_lock */
+static GstDiscoverer *
+create_discoverer ()
+{
+  GstDiscoverer *disco = gst_discoverer_new (discovering_timeout, NULL);
+
+  g_signal_connect (disco, "discovered", G_CALLBACK (discoverer_discovered_cb),
+      NULL);
+  GST_INFO_OBJECT (disco, "Creating new discoverer");
+  g_hash_table_insert (discoverers, g_thread_self (), disco);
+  gst_discoverer_start (disco);
+
+  return disco;
+}
+
+static GstDiscoverer *
+get_discoverer ()
+{
+  GstDiscoverer *disco;
+
+  G_LOCK (discoverers_lock);
+  g_assert (discoverers);
+  disco = g_hash_table_lookup (discoverers, g_thread_self ());
+  if (!disco) {
+    disco = create_discoverer ();
+  }
+  disco = gst_object_ref (disco);
+  G_UNLOCK (discoverers_lock);
+
+  return disco;
+}
 
 static void
 initable_iface_init (GInitableIface * initable_iface)
@@ -62,9 +98,6 @@ enum
 };
 static GParamSpec *properties[PROP_LAST];
 
-static void discoverer_discovered_cb (GstDiscoverer * discoverer,
-    GstDiscovererInfo * info, GError * err, gpointer user_data);
-
 struct _GESUriClipAssetPrivate
 {
   GstDiscovererInfo *info;
@@ -128,12 +161,14 @@ _start_loading (GESAsset * asset, GError ** error)
 {
   gboolean ret;
   const gchar *uri;
-  GESUriClipAssetClass *class = GES_URI_CLIP_ASSET_GET_CLASS (asset);
+  GstDiscoverer *discoverer = get_discoverer ();
 
   uri = ges_asset_get_id (asset);
+  GST_DEBUG_OBJECT (discoverer, "Started loading %s", uri);
+
+  ret = gst_discoverer_discover_uri_async (discoverer, uri);
+  gst_object_unref (discoverer);
 
-  GST_DEBUG_OBJECT (asset, "Started loading %s", uri);
-  ret = gst_discoverer_discover_uri_async (class->discoverer, uri);
   if (ret)
     return GES_ASSET_LOADING_ASYNC;
 
@@ -568,9 +603,7 @@ ges_uri_clip_asset_request_sync (const gchar * uri, GError ** error)
   GError *lerror = NULL;
   GESUriClipAsset *asset;
   RequestSyncData data = { 0, };
-  GESUriClipAssetClass *klass = g_type_class_peek (GES_TYPE_URI_CLIP_ASSET);
-  GstClockTime timeout;
-  GstDiscoverer *previous_discoverer = klass->discoverer;
+  GstDiscoverer *previous_discoverer;
 
   asset = GES_URI_CLIP_ASSET (ges_asset_request (GES_TYPE_URI_CLIP, uri,
           &lerror));
@@ -579,25 +612,17 @@ ges_uri_clip_asset_request_sync (const gchar * uri, GError ** error)
     return asset;
 
   data.ml = g_main_loop_new (NULL, TRUE);
-  g_object_get (previous_discoverer, "timeout", &timeout, NULL);
-  klass->discoverer = gst_discoverer_new (timeout, error);
-  g_object_set (klass->discoverer, "use-cache", TRUE, NULL);
-  if (!klass->discoverer) {
-    klass->discoverer = previous_discoverer;
-
-    return NULL;
-  }
+  previous_discoverer = get_discoverer ();
+  create_discoverer ();
 
-  g_signal_connect (klass->discoverer, "discovered",
-      G_CALLBACK (klass->discovered), NULL);
-  gst_discoverer_start (klass->discoverer);
   ges_asset_request_async (GES_TYPE_URI_CLIP, uri, NULL,
       (GAsyncReadyCallback) asset_ready_cb, &data);
   g_main_loop_run (data.ml);
   g_main_loop_unref (data.ml);
 
-  gst_object_unref (klass->discoverer);
-  klass->discoverer = previous_discoverer;
+  G_LOCK (discoverers_lock);
+  g_hash_table_insert (discoverers, g_thread_self (), previous_discoverer);
+  G_UNLOCK (discoverers_lock);
 
   if (data.error) {
     GST_ERROR ("Got an error requesting asset: %s", data.error->message);
@@ -621,9 +646,18 @@ void
 ges_uri_clip_asset_class_set_timeout (GESUriClipAssetClass * klass,
     GstClockTime timeout)
 {
+  GHashTableIter iter;
+  gpointer value;
+
   g_return_if_fail (GES_IS_URI_CLIP_ASSET_CLASS (klass));
 
-  g_object_set (klass->discoverer, "timeout", timeout, NULL);
+  discovering_timeout = timeout;
+
+  G_LOCK (discoverers_lock);
+  g_hash_table_iter_init (&iter, discoverers);
+  while (g_hash_table_iter_next (&iter, NULL, &value))
+    g_object_set (value, "timeout", timeout, NULL);
+  G_UNLOCK (discoverers_lock);
 }
 
 /**
@@ -774,13 +808,17 @@ ges_uri_source_asset_get_filesource_asset (GESUriSourceAsset * asset)
 void
 _ges_uri_asset_cleanup (void)
 {
-  if (discoverer)
-    gst_discoverer_stop (discoverer);
-  g_clear_object (&discoverer);
   if (parent_newparent_table) {
     g_hash_table_destroy (parent_newparent_table);
     parent_newparent_table = NULL;
   }
+
+  G_LOCK (discoverers_lock);
+  if (discoverers) {
+    g_hash_table_destroy (discoverers);
+    discoverers = NULL;
+  }
+  G_UNLOCK (discoverers_lock);
 }
 
 gboolean
@@ -790,6 +828,7 @@ _ges_uri_asset_ensure_setup (gpointer uriasset_class)
   GError *err;
   GstClockTime timeout;
   const gchar *timeout_str;
+  GstDiscoverer *discoverer = NULL;
 
   g_return_val_if_fail (GES_IS_URI_CLIP_ASSET_CLASS (uriasset_class), FALSE);
 
@@ -826,10 +865,17 @@ _ges_uri_asset_ensure_setup (gpointer uriasset_class)
 
     g_signal_connect (klass->discoverer, "discovered",
         G_CALLBACK (klass->discovered), NULL);
+    gst_discoverer_start (klass->discoverer);
+  }
+
+  G_LOCK (discoverers_lock);
+  if (discoverers == NULL) {
+    discoverers = g_hash_table_new_full (g_direct_hash,
+        (GEqualFunc) g_direct_equal, NULL, g_object_unref);
   }
+  G_UNLOCK (discoverers_lock);
 
   /* We just start the discoverer and let it live */
-  gst_discoverer_start (klass->discoverer);
   if (parent_newparent_table == NULL) {
     parent_newparent_table = g_hash_table_new_full (g_file_hash,
         (GEqualFunc) g_file_equal, g_object_unref, g_object_unref);

ges/ges-uri-asset.h

@@ -62,11 +62,13 @@ struct _GESUriClipAssetClass
   GESClipAssetClass parent_class;
 
   /* <private> */
-  GstDiscoverer *discoverer;
-  GstDiscoverer *sync_discoverer;
+  GstDiscoverer *discoverer; /* Unused */
+  GstDiscoverer *sync_discoverer; /* Unused */
 
-  void (*discovered) (GstDiscoverer * discoverer, GstDiscovererInfo * info,
-                     GError * err, gpointer user_data);
+  void (*discovered) (GstDiscoverer * discoverer, /* Unused */
+                      GstDiscovererInfo * info,
+                      GError * err,
+                      gpointer user_data);
 
   gpointer _ges_reserved[GES_PADDING -1];
 };

plugins/ges/gesdemux.c

@@ -171,26 +171,16 @@ error_loading_asset_cb (GESProject * project, GError * error, gchar * id,
   g_main_loop_quit (data->ml);
 }
 
-/* TODO: Add a way to run a function in the right GES thread */
 static gboolean
 ges_timeline_new_from_uri_from_main_thread (TimelineConstructionData * data)
 {
   GESProject *project = ges_project_new (data->uri);
-  GESUriClipAssetClass *klass = g_type_class_peek (GES_TYPE_URI_CLIP_ASSET);
-  GstDiscoverer *previous_discoverer = klass->discoverer;
-  GstClockTime timeout;
   G_GNUC_UNUSED void *unused;
 
-  g_object_get (previous_discoverer, "timeout", &timeout, NULL);
-
-  /* Make sure to use a new discoverer in case we are being discovered,
-   * as discovering is done one by one, and the global discoverer won't
-   * have the chance to discover the project assets */
   g_mutex_lock (&data->lock);
   klass->discoverer = gst_discoverer_new (timeout, &data->error);
   g_object_set (klass->discoverer, "use-cache", TRUE, NULL);
   if (data->error) {
-    klass->discoverer = previous_discoverer;
     g_mutex_unlock (&data->lock);
 
     goto done;
@@ -222,15 +212,6 @@ done:
 
   g_mutex_lock (&data->lock);
 
-  /* Set previous discoverer back! */
-
-  if (klass->discoverer)
-    gst_object_unref (klass->discoverer);
-  klass->discoverer = previous_discoverer;
-
-  if (data->timeline)
-    ges_timeline_commit (data->timeline);
-
   if (data->loaded_sigid)
     g_signal_handler_disconnect (project, data->loaded_sigid);