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/* GStreamer
* Copyright (C) 2015-2017 YouView TV Ltd
* Author: Vincent Penquerc'h <>
* gstipcslavepipeline.c:
* 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
* 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.
* SECTION:element-ipcslavepipeline
* @see_also: #GstIpcPipelineSink, #GstIpcPipelineSrc
* This is a GstPipeline subclass meant to embed one ore more ipcpipelinesrc
* elements, and be slaved transparently to the master pipeline, using one ore
* more ipcpipelinesink elements on the master.
* The actual pipeline slaving logic happens in ipcpipelinesrc. The only thing
* that this class actually does is that it watches the pipeline bus for
* messages and forwards them to the master pipeline through the ipcpipelinesrc
* elements that it contains.
* For more details about this mechanism and its uses, see the documentation
* of the ipcpipelinesink element.
#include "config.h"
#include <string.h>
#include "gstipcpipelinesrc.h"
#include "gstipcslavepipeline.h"
GST_DEBUG_CATEGORY_STATIC (gst_ipcslavepipeline_debug);
#define GST_CAT_DEFAULT gst_ipcslavepipeline_debug
#define _do_init \
GST_DEBUG_CATEGORY_INIT (gst_ipcslavepipeline_debug, "ipcslavepipeline", 0, "ipcslavepipeline element");
#define gst_ipc_slave_pipeline_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstIpcSlavePipeline, gst_ipc_slave_pipeline,
static gboolean gst_ipc_slave_pipeline_post_message (GstElement * element,
GstMessage * message);
static void
gst_ipc_slave_pipeline_class_init (GstIpcSlavePipelineClass * klass)
GstElementClass *element_class;
element_class = GST_ELEMENT_CLASS (klass);
element_class->post_message = gst_ipc_slave_pipeline_post_message;
gst_element_class_set_static_metadata (element_class,
"Inter-process slave pipeline",
"Contains the slave part of an inter-process pipeline",
"Vincent Penquerc'h <");
static void
gst_ipc_slave_pipeline_init (GstIpcSlavePipeline * isp)
static gboolean
send_message_if_ipcpipelinesrc (const GValue * v, GValue * r,
gpointer user_data)
GstElement *e;
GType et;
gboolean ret;
GstMessage *message = user_data;
e = g_value_get_object (v);
et = gst_element_factory_get_element_type (gst_element_get_factory (e));
g_signal_emit_by_name (G_OBJECT (e), "forward-message", message, &ret);
/* if we succesfully sent this to the master and it's not ASYNC_DONE or EOS,
* we can skip sending it again through the other ipcpipelinesrcs */
if (ret && GST_MESSAGE_TYPE (message) != GST_MESSAGE_ASYNC_DONE &&
return FALSE;
return TRUE;
static void
gst_ipc_slave_pipeline_forward_message (GstIpcSlavePipeline * pipeline,
GstMessage * message)
GstIterator *it;
it = gst_bin_iterate_sources (GST_BIN (pipeline));
gst_iterator_fold (it, send_message_if_ipcpipelinesrc, NULL, message);
gst_iterator_free (it);
static gboolean
gst_ipc_slave_pipeline_post_message (GstElement * element, GstMessage * message)
gst_ipc_slave_pipeline_forward_message (GST_IPC_SLAVE_PIPELINE
(element), message);
return GST_ELEMENT_CLASS (parent_class)->post_message (element, message);