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270 lines
8.4 KiB
C
270 lines
8.4 KiB
C
/* GStreamer
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* Copyright (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* Copyright (c) 2006 Jürg Billeter <j@bitron.ch>
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* Copyright (c) 2007 Jan Schmidt <thaytan@noraisin.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "gstswitchsink.h"
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GST_DEBUG_CATEGORY_STATIC (switch_debug);
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#define GST_CAT_DEFAULT switch_debug
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static void gst_switch_sink_dispose (GObject * object);
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static GstStateChangeReturn
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gst_switch_sink_change_state (GstElement * element, GstStateChange transition);
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enum
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{
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PROP_0
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};
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GST_BOILERPLATE (GstSwitchSink, gst_switch_sink, GstBin, GST_TYPE_BIN);
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static void
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gst_switch_sink_base_init (gpointer klass)
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{
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GST_DEBUG_CATEGORY_INIT (switch_debug, "switchsink", 0, "switchsink element");
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}
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static void
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gst_switch_sink_class_init (GstSwitchSinkClass * klass)
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{
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GObjectClass *oklass = G_OBJECT_CLASS (klass);
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GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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GstPadTemplate *child_pad_templ;
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oklass->dispose = gst_switch_sink_dispose;
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eklass->change_state = gst_switch_sink_change_state;
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/* Provide a default pad template if the child didn't */
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child_pad_templ = gst_element_class_get_pad_template (eklass, "sink");
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if (child_pad_templ == NULL) {
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gst_element_class_add_pad_template (eklass,
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gst_static_pad_template_get (&sink_template));
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}
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}
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static gboolean
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gst_switch_sink_reset (GstSwitchSink * sink)
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{
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/* this will install fakesink if no other child has been set,
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* otherwise we rely on the subclass to know when to unset its
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* custom kid */
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if (sink->kid == NULL) {
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return gst_switch_sink_set_child (sink, NULL);
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}
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return TRUE;
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}
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static void
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gst_switch_sink_init (GstSwitchSink * sink, GstSwitchSinkClass * g_class)
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{
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GstElementClass *eklass = GST_ELEMENT_GET_CLASS (sink);
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GstPadTemplate *templ;
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templ = gst_element_class_get_pad_template (eklass, "sink");
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sink->pad = gst_ghost_pad_new_no_target_from_template ("sink", templ);
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gst_element_add_pad (GST_ELEMENT (sink), sink->pad);
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gst_switch_sink_reset (sink);
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GST_OBJECT_FLAG_SET (sink, GST_ELEMENT_IS_SINK);
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}
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static void
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gst_switch_sink_dispose (GObject * object)
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{
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GstSwitchSink *sink = GST_SWITCH_SINK (object);
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GstObject *new_kid, *kid;
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GST_OBJECT_LOCK (sink);
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new_kid = GST_OBJECT_CAST (sink->new_kid);
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sink->new_kid = NULL;
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kid = GST_OBJECT_CAST (sink->kid);
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sink->kid = NULL;
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GST_OBJECT_UNLOCK (sink);
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gst_object_replace (&new_kid, NULL);
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gst_object_replace (&kid, NULL);
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GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
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}
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static gboolean
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gst_switch_sink_commit_new_kid (GstSwitchSink * sink)
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{
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GstPad *targetpad;
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GstState kid_state;
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GstElement *new_kid, *old_kid;
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gboolean is_fakesink = FALSE;
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GstBus *bus;
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/* need locking around member accesses */
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GST_OBJECT_LOCK (sink);
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/* If we're currently changing state, set the child to the next state
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* we're transitioning too, rather than our current state which is
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* about to change */
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if (GST_STATE_NEXT (sink) != GST_STATE_VOID_PENDING)
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kid_state = GST_STATE_NEXT (sink);
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else
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kid_state = GST_STATE (sink);
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new_kid = sink->new_kid ? gst_object_ref (sink->new_kid) : NULL;
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sink->new_kid = NULL;
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GST_OBJECT_UNLOCK (sink);
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/* Fakesink by default if NULL is passed as the new child */
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if (new_kid == NULL) {
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GST_DEBUG_OBJECT (sink, "Replacing kid with fakesink");
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new_kid = gst_element_factory_make ("fakesink", "testsink");
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if (new_kid == NULL) {
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GST_ERROR_OBJECT (sink, "Failed to create fakesink");
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return FALSE;
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}
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/* Add a reference, as it would if the element came from sink->new_kid */
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gst_object_ref (new_kid);
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g_object_set (new_kid, "sync", TRUE, NULL);
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is_fakesink = TRUE;
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} else {
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GST_DEBUG_OBJECT (sink, "Setting new kid");
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}
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/* set temporary bus of our own to catch error messages from the child
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* (could we just set our own bus on it, or would the state change messages
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* from the not-yet-added element confuse the state change algorithm? Let's
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* play it safe for now) */
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bus = gst_bus_new ();
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gst_element_set_bus (new_kid, bus);
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gst_object_unref (bus);
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if (gst_element_set_state (new_kid, kid_state) == GST_STATE_CHANGE_FAILURE) {
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GstMessage *msg;
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/* check if child posted an error message and if so re-post it on our bus
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* so that the application gets to see a decent error and not our generic
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* fallback error message which is completely indecipherable to the user */
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msg = gst_bus_pop_filtered (GST_ELEMENT_BUS (new_kid), GST_MESSAGE_ERROR);
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if (msg) {
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GST_INFO_OBJECT (sink, "Forwarding kid error: %" GST_PTR_FORMAT, msg);
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gst_element_post_message (GST_ELEMENT (sink), msg);
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}
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GST_ELEMENT_ERROR (sink, CORE, STATE_CHANGE, (NULL),
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("Failed to set state on new child."));
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gst_element_set_bus (new_kid, NULL);
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gst_object_unref (new_kid);
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return FALSE;
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}
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gst_element_set_bus (new_kid, NULL);
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gst_bin_add (GST_BIN (sink), new_kid);
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/* Now, replace the existing child */
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GST_OBJECT_LOCK (sink);
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old_kid = sink->kid;
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sink->kid = new_kid;
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/* Mark whether a custom kid or fakesink has been installed */
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sink->have_kid = !is_fakesink;
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GST_OBJECT_UNLOCK (sink);
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/* kill old element */
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if (old_kid) {
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GST_DEBUG_OBJECT (sink, "Removing old kid %" GST_PTR_FORMAT, old_kid);
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gst_element_set_state (old_kid, GST_STATE_NULL);
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gst_bin_remove (GST_BIN (sink), old_kid);
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gst_object_unref (old_kid);
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/* Don't lose the SINK flag */
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GST_OBJECT_FLAG_SET (sink, GST_ELEMENT_IS_SINK);
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}
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/* re-attach ghostpad */
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GST_DEBUG_OBJECT (sink, "Creating new ghostpad");
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targetpad = gst_element_get_static_pad (sink->kid, "sink");
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gst_ghost_pad_set_target (GST_GHOST_PAD (sink->pad), targetpad);
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gst_object_unref (targetpad);
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GST_DEBUG_OBJECT (sink, "done changing child of switchsink");
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/* FIXME: Push new-segment info and pre-roll buffer(s) into the kid */
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return TRUE;
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}
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gboolean
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gst_switch_sink_set_child (GstSwitchSink * sink, GstElement * new_kid)
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{
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GstState cur, next;
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GstElement **p_kid;
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/* Nothing to do if clearing the child and we've already installed fakesink */
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if (new_kid == NULL && sink->kid != NULL && sink->have_kid == FALSE)
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return TRUE;
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/* Store the new kid to be committed later */
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GST_OBJECT_LOCK (sink);
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cur = GST_STATE (sink);
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next = GST_STATE_NEXT (sink);
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p_kid = &sink->new_kid;
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gst_object_replace ((GstObject **) p_kid, (GstObject *) new_kid);
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GST_OBJECT_UNLOCK (sink);
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if (new_kid)
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gst_object_unref (new_kid);
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/* Sometime, it would be lovely to allow sink changes even when
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* already running, but this involves sending an appropriate new-segment
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* and possibly prerolling etc */
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/* FIXME: Block the pad and replace the kid when it completes */
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if (cur > GST_STATE_READY || next == GST_STATE_PAUSED) {
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GST_DEBUG_OBJECT (sink,
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"Switch-sink is already running. Ignoring change of child.");
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gst_object_unref (new_kid);
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return TRUE;
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}
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return gst_switch_sink_commit_new_kid (sink);
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}
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static GstStateChangeReturn
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gst_switch_sink_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
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GstSwitchSink *sink = GST_SWITCH_SINK (element);
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ret = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, change_state,
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(element, transition), GST_STATE_CHANGE_SUCCESS);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_NULL:
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if (!gst_switch_sink_reset (sink))
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ret = GST_STATE_CHANGE_FAILURE;
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break;
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default:
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break;
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}
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return ret;
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}
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