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-rw-r--r--gst/meson.build1
-rw-r--r--gst/proxy/Makefile.am27
-rw-r--r--gst/proxy/gstproxy-priv.h37
-rw-r--r--gst/proxy/gstproxy.c43
-rw-r--r--gst/proxy/gstproxysink.c301
-rw-r--r--gst/proxy/gstproxysink.h56
-rw-r--r--gst/proxy/gstproxysrc.c358
-rw-r--r--gst/proxy/gstproxysrc.h56
-rw-r--r--gst/proxy/meson.build14
9 files changed, 893 insertions, 0 deletions
diff --git a/gst/meson.build b/gst/meson.build
index 1017adf30..b56b68d26 100644
--- a/gst/meson.build
+++ b/gst/meson.build
@@ -42,6 +42,7 @@ subdir('netsim')
subdir('onvif')
subdir('pcapparse')
subdir('pnm')
+subdir('proxy')
subdir('rawparse')
subdir('removesilence')
subdir('sdp')
diff --git a/gst/proxy/Makefile.am b/gst/proxy/Makefile.am
new file mode 100644
index 000000000..476a3534e
--- /dev/null
+++ b/gst/proxy/Makefile.am
@@ -0,0 +1,27 @@
+plugin_LTLIBRARIES = libgstproxy.la
+
+libgstproxy_la_SOURCES = \
+ gstproxy.c \
+ gstproxysink.c \
+ gstproxysrc.c
+
+noinst_HEADERS = \
+ gstproxysink.h \
+ gstproxysrc.h \
+ gstproxy-priv.h
+
+libgstproxy_la_CFLAGS = $(GST_CFLAGS)
+libgstproxy_la_LIBADD = $(GST_LIBS)
+libgstproxy_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+libgstproxy_la_LIBTOOLFLAGS = $(GST_PLUGIN_LIBTOOLFLAGS)
+
+gstproxytest_SOURCES = \
+ gstproxytest.c
+
+gstproxytest_CFLAGS = \
+ $(GST_PLUGINS_BASE_CFLAGS) \
+ $(GST_CFLAGS)
+
+gstproxytest_LDADD = \
+ $(GST_PLUGINS_BASE_LIBS) \
+ $(GST_LIBS)
diff --git a/gst/proxy/gstproxy-priv.h b/gst/proxy/gstproxy-priv.h
new file mode 100644
index 000000000..d15da9aa5
--- /dev/null
+++ b/gst/proxy/gstproxy-priv.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2018 Centricular Ltd.
+ * Author: Nirbheek Chauhan <nirbheek@centricular.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.
+ */
+
+#ifndef __GST_PROXY_PRIV_H__
+#define __GST_PROXY_PRIV_H__
+
+#include "gstproxysrc.h"
+#include "gstproxysink.h"
+
+G_BEGIN_DECLS
+
+void gst_proxy_sink_set_proxysrc (GstProxySink *sink, GstProxySrc *src);
+
+GstPad* gst_proxy_sink_get_internal_sinkpad (GstProxySink *sink);
+
+GstPad* gst_proxy_src_get_internal_srcpad (GstProxySrc *src);
+
+G_END_DECLS
+
+#endif /* __GST_PROXY_PRIV_H__ */
diff --git a/gst/proxy/gstproxy.c b/gst/proxy/gstproxy.c
new file mode 100644
index 000000000..03e188891
--- /dev/null
+++ b/gst/proxy/gstproxy.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2015 Centricular Ltd.
+ * Author: Sebastian Dröge <sebastian@centricular.com>
+ * Author: Nirbheek Chauhan <nirbheek@centricular.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 Street, Suite 500,
+ * Boston, MA 02110-1335, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstproxysrc.h"
+#include "gstproxysink.h"
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+ gst_element_register (plugin, "proxysrc", GST_RANK_NONE, GST_TYPE_PROXY_SRC);
+ gst_element_register (plugin, "proxysink", GST_RANK_NONE,
+ GST_TYPE_PROXY_SINK);
+
+ return TRUE;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+ GST_VERSION_MINOR,
+ proxy,
+ "plugin for proxied inter-pipeline communication",
+ plugin_init, VERSION, "LGPL", "gstproxy", "http://centricular.com")
diff --git a/gst/proxy/gstproxysink.c b/gst/proxy/gstproxysink.c
new file mode 100644
index 000000000..8976783df
--- /dev/null
+++ b/gst/proxy/gstproxysink.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright (C) 2018 Centricular Ltd.
+ * Author: Sebastian Dröge <sebastian@centricular.com>
+ * Author: Nirbheek Chauhan <nirbheek@centricular.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.
+ */
+
+/**
+ * SECTION:element-proxysink
+ * @title: proxysink
+ *
+ * Proxysink is a sink element that proxies events, queries, and buffers to
+ * another pipeline that contains a matching proxysrc element. The purpose is
+ * to allow two decoupled pipelines to function as though they are one without
+ * having to manually shuttle buffers, events, queries, etc between the two.
+ *
+ * This element also copies sticky events onto the matching proxysrc element.
+ *
+ * For example usage, see proxysrc.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "gstproxysink.h"
+#include "gstproxysrc.h"
+#include "gstproxy-priv.h"
+
+#define GST_CAT_DEFAULT gst_proxy_sink_debug
+GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS_ANY);
+
+struct _GstProxySinkPrivate
+{
+ GstPad *sinkpad;
+ /* The proxysrc that we push events, buffers, queries to */
+ GWeakRef proxysrc;
+ /* Whether there are sticky events pending */
+ gboolean pending_sticky_events;
+};
+
+/* We're not subclassing from basesink because we don't want any of the special
+ * handling it has for events/queries/etc. We just pass-through everything. */
+
+/* Unlink proxysrc, we don't contain any elements so our parent is GstElement */
+#define parent_class gst_proxy_sink_parent_class
+G_DEFINE_TYPE (GstProxySink, gst_proxy_sink, GST_TYPE_ELEMENT);
+
+static gboolean gst_proxy_sink_sink_query (GstPad * pad, GstObject * parent,
+ GstQuery * query);
+static GstFlowReturn gst_proxy_sink_sink_chain (GstPad * pad,
+ GstObject * parent, GstBuffer * buffer);
+static GstFlowReturn gst_proxy_sink_sink_chain_list (GstPad * pad,
+ GstObject * parent, GstBufferList * list);
+static gboolean gst_proxy_sink_sink_event (GstPad * pad, GstObject * parent,
+ GstEvent * event);
+
+static GstStateChangeReturn gst_proxy_sink_change_state (GstElement * element,
+ GstStateChange transition);
+
+static void
+gst_proxy_sink_class_init (GstProxySinkClass * klass)
+{
+ GstElementClass *gstelement_class = (GstElementClass *) klass;
+
+ GST_DEBUG_CATEGORY_INIT (gst_proxy_sink_debug, "proxysink", 0, "proxy sink");
+
+ g_type_class_add_private (klass, sizeof (GstProxySinkPrivate));
+
+ gstelement_class->change_state = gst_proxy_sink_change_state;
+
+ gst_element_class_add_pad_template (gstelement_class,
+ gst_static_pad_template_get (&sink_template));
+
+ gst_element_class_set_static_metadata (gstelement_class, "Proxy Sink",
+ "Sink", "Proxy source for internal process communication",
+ "Sebastian Dröge <sebastian@centricular.com>");
+}
+
+static void
+gst_proxy_sink_init (GstProxySink * self)
+{
+ self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, GST_TYPE_PROXY_SINK,
+ GstProxySinkPrivate);
+ self->priv->sinkpad =
+ gst_pad_new_from_static_template (&sink_template, "sink");
+ gst_pad_set_chain_function (self->priv->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_proxy_sink_sink_chain));
+ gst_pad_set_chain_list_function (self->priv->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_proxy_sink_sink_chain_list));
+ gst_pad_set_event_function (self->priv->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_proxy_sink_sink_event));
+ gst_pad_set_query_function (self->priv->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_proxy_sink_sink_query));
+ gst_element_add_pad (GST_ELEMENT (self), self->priv->sinkpad);
+}
+
+static GstStateChangeReturn
+gst_proxy_sink_change_state (GstElement * element, GstStateChange transition)
+{
+ GstElementClass *gstelement_class =
+ GST_ELEMENT_CLASS (gst_proxy_sink_parent_class);
+ GstProxySink *self = GST_PROXY_SINK (element);
+ GstStateChangeReturn ret;
+
+ switch (transition) {
+ case GST_STATE_CHANGE_READY_TO_PAUSED:
+ self->priv->pending_sticky_events = FALSE;
+ break;
+ default:
+ break;
+ }
+
+ ret = gstelement_class->change_state (element, transition);
+
+ return ret;
+}
+
+static gboolean
+gst_proxy_sink_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
+{
+ GstProxySink *self = GST_PROXY_SINK (parent);
+ GstProxySrc *src;
+ gboolean ret = FALSE;
+
+ GST_LOG_OBJECT (pad, "Handling query of type '%s'",
+ gst_query_type_get_name (GST_QUERY_TYPE (query)));
+
+ src = g_weak_ref_get (&self->priv->proxysrc);
+ if (src) {
+ GstPad *srcpad;
+ srcpad = gst_proxy_src_get_internal_srcpad (src);
+
+ ret = gst_pad_peer_query (srcpad, query);
+ gst_object_unref (srcpad);
+ gst_object_unref (src);
+ }
+
+ return ret;
+}
+
+typedef struct
+{
+ GstPad *otherpad;
+ GstFlowReturn ret;
+} CopyStickyEventsData;
+
+static gboolean
+copy_sticky_events (G_GNUC_UNUSED GstPad * pad, GstEvent ** event,
+ gpointer user_data)
+{
+ CopyStickyEventsData *data = user_data;
+
+ data->ret = gst_pad_store_sticky_event (data->otherpad, *event);
+
+ return data->ret == GST_FLOW_OK;
+}
+
+static gboolean
+gst_proxy_sink_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
+{
+ GstProxySink *self = GST_PROXY_SINK (parent);
+ GstProxySrc *src;
+ gboolean ret = FALSE;
+ gboolean sticky = GST_EVENT_IS_STICKY (event);
+
+ GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
+
+ if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP)
+ self->priv->pending_sticky_events = FALSE;
+
+ src = g_weak_ref_get (&self->priv->proxysrc);
+ if (src) {
+ GstPad *srcpad;
+ srcpad = gst_proxy_src_get_internal_srcpad (src);
+
+ if (sticky && self->priv->pending_sticky_events) {
+ CopyStickyEventsData data = { srcpad, GST_FLOW_OK };
+
+ gst_pad_sticky_events_foreach (pad, copy_sticky_events, &data);
+ self->priv->pending_sticky_events = data.ret != GST_FLOW_OK;
+ }
+
+ ret = gst_pad_push_event (srcpad, event);
+ gst_object_unref (srcpad);
+ gst_object_unref (src);
+
+ if (!ret && sticky) {
+ self->priv->pending_sticky_events = TRUE;
+ ret = TRUE;
+ }
+ } else
+ gst_event_unref (event);
+
+ return ret;
+}
+
+static GstFlowReturn
+gst_proxy_sink_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
+{
+ GstProxySink *self = GST_PROXY_SINK (parent);
+ GstProxySrc *src;
+ GstFlowReturn ret = GST_FLOW_OK;
+
+ GST_LOG_OBJECT (pad, "Chaining buffer %p", buffer);
+
+ src = g_weak_ref_get (&self->priv->proxysrc);
+ if (src) {
+ GstPad *srcpad;
+ srcpad = gst_proxy_src_get_internal_srcpad (src);
+
+ if (self->priv->pending_sticky_events) {
+ CopyStickyEventsData data = { srcpad, GST_FLOW_OK };
+
+ gst_pad_sticky_events_foreach (pad, copy_sticky_events, &data);
+ self->priv->pending_sticky_events = data.ret != GST_FLOW_OK;
+ }
+
+ ret = gst_pad_push (srcpad, buffer);
+ gst_object_unref (srcpad);
+ gst_object_unref (src);
+
+ GST_LOG_OBJECT (pad, "Chained buffer %p: %s", buffer,
+ gst_flow_get_name (ret));
+ } else {
+ gst_buffer_unref (buffer);
+ GST_LOG_OBJECT (pad, "Dropped buffer %p: no otherpad", buffer);
+ }
+
+ return GST_FLOW_OK;
+}
+
+static GstFlowReturn
+gst_proxy_sink_sink_chain_list (GstPad * pad, GstObject * parent,
+ GstBufferList * list)
+{
+ GstProxySink *self = GST_PROXY_SINK (parent);
+ GstProxySrc *src;
+ GstFlowReturn ret = GST_FLOW_OK;
+
+ GST_LOG_OBJECT (pad, "Chaining buffer list %p", list);
+
+ src = g_weak_ref_get (&self->priv->proxysrc);
+ if (src) {
+ GstPad *srcpad;
+ srcpad = gst_proxy_src_get_internal_srcpad (src);
+
+ if (self->priv->pending_sticky_events) {
+ CopyStickyEventsData data = { srcpad, GST_FLOW_OK };
+
+ gst_pad_sticky_events_foreach (pad, copy_sticky_events, &data);
+ self->priv->pending_sticky_events = data.ret != GST_FLOW_OK;
+ }
+
+ ret = gst_pad_push_list (srcpad, list);
+ gst_object_unref (srcpad);
+ gst_object_unref (src);
+ GST_LOG_OBJECT (pad, "Chained buffer list %p: %s", list,
+ gst_flow_get_name (ret));
+ } else {
+ gst_buffer_list_unref (list);
+ GST_LOG_OBJECT (pad, "Dropped buffer list %p: no otherpad", list);
+ }
+
+ return GST_FLOW_OK;
+}
+
+/* Wrapper function for accessing private member
+ * This can also be retrieved with gst_element_get_static_pad, but that depends
+ * on the implementation of GstProxySink */
+GstPad *
+gst_proxy_sink_get_internal_sinkpad (GstProxySink * self)
+{
+ g_return_val_if_fail (self, NULL);
+ return gst_object_ref (self->priv->sinkpad);
+}
+
+void
+gst_proxy_sink_set_proxysrc (GstProxySink * self, GstProxySrc * src)
+{
+ g_return_if_fail (self);
+ g_weak_ref_set (&self->priv->proxysrc, src);
+}
diff --git a/gst/proxy/gstproxysink.h b/gst/proxy/gstproxysink.h
new file mode 100644
index 000000000..9952cfdef
--- /dev/null
+++ b/gst/proxy/gstproxysink.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2015 Centricular Ltd.
+ * Author: Sebastian Dröge <sebastian@centricular.com>
+ * Author: Nirbheek Chauhan <nirbheek@centricular.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.
+ */
+
+#ifndef __GST_PROXY_SINK_H__
+#define __GST_PROXY_SINK_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_PROXY_SINK (gst_proxy_sink_get_type())
+#define GST_PROXY_SINK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_PROXY_SINK, GstProxySink))
+#define GST_IS_PROXY_SINK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_PROXY_SINK))
+#define GST_PROXY_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) , GST_TYPE_PROXY_SINK, GstProxySinkClass))
+#define GST_IS_PROXY_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) , GST_TYPE_PROXY_SINK))
+#define GST_PROXY_SINK_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) , GST_TYPE_PROXY_SINK, GstProxySinkClass))
+
+typedef struct _GstProxySink GstProxySink;
+typedef struct _GstProxySinkClass GstProxySinkClass;
+typedef struct _GstProxySinkPrivate GstProxySinkPrivate;
+
+struct _GstProxySink {
+ GstElement parent;
+
+ /* < private > */
+ GstProxySinkPrivate *priv;
+ gpointer _gst_reserved[GST_PADDING];
+};
+
+struct _GstProxySinkClass {
+ GstElementClass parent_class;
+};
+
+GType gst_proxy_sink_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_PROXY_SINK_H__ */
diff --git a/gst/proxy/gstproxysrc.c b/gst/proxy/gstproxysrc.c
new file mode 100644
index 000000000..e2c4af0ba
--- /dev/null
+++ b/gst/proxy/gstproxysrc.c
@@ -0,0 +1,358 @@
+/*
+ * Copyright (C) 2018 Centricular Ltd.
+ * Author: Sebastian Dröge <sebastian@centricular.com>
+ * Author: Nirbheek Chauhan <nirbheek@centricular.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.
+ */
+
+/**
+ * SECTION:element-proxysrc
+ * @title: proxysrc
+ *
+ * Proxysrc is a source element that proxies events, queries, and buffers from
+ * another pipeline that contains a matching proxysink element. The purpose is
+ * to allow two decoupled pipelines to function as though they are one without
+ * having to manually shuttle buffers, events, queries, etc between the two.
+ *
+ * The element queues buffers from the matching proxysink to an internal queue,
+ * so everything downstream is properly decoupled from the upstream pipeline.
+ * However, the queue may get filled up if the downstream pipeline does not
+ * accept buffers quickly enough; perhaps because it is not yet PLAYING.
+ *
+ * ## Usage
+ *
+ * |[<!-- language="C" -->
+ * GstElement *pipe1, *pipe2, *psink, *psrc;
+ * GstClock *clock;
+ *
+ * pipe1 = gst_parse_launch ("audiotestsrc ! proxysink name=psink", NULL);
+ * psink = gst_bin_get_by_name (GST_BIN (pipe1), "psink");
+ *
+ * pipe2 = gst_parse_launch ("proxysrc name=psrc ! autoaudiosink", NULL);
+ * psrc = gst_bin_get_by_name (GST_BIN (pipe2), "psrc");
+ *
+ * // Connect the two pipelines
+ * g_object_set (psrc, "proxysink", psink, NULL);
+ *
+ * // Both pipelines must agree on the timing information or we'll get glitches
+ * // or overruns/underruns. Ideally, we should tell pipe1 to use the same clock
+ * // as pipe2, but since that will be set asynchronously to the audio clock, it
+ * // is simpler and likely accurate enough to use the system clock for both
+ * // pipelines. If no element in either pipeline will provide a clock, this
+ * // is not needed.
+ * clock = gst_system_clock_obtain ();
+ * gst_pipeline_use_clock (GST_PIPELINE (pipe1), clock);
+ * gst_pipeline_use_clock (GST_PIPELINE (pipe2), clock);
+ * g_object_unref (clock);
+ *
+ * // This is not really needed in this case since the pipelines are created and
+ * // started at the same time. However, an application that dynamically
+ * // generates pipelines must ensure that all the pipelines that will be
+ * // connected together share the same base time.
+ * gst_element_set_base_time (pipe1, 0);
+ * gst_element_set_base_time (pipe2, 0);
+ *
+ * gst_element_set_state (pipe1, GST_STATE_PLAYING);
+ * gst_element_set_state (pipe2, GST_STATE_PLAYING);
+ * ]|
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "gstproxysrc.h"
+#include "gstproxysink.h"
+#include "gstproxy-priv.h"
+
+#define GST_CAT_DEFAULT gst_proxy_src_debug
+GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+
+static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS_ANY);
+
+enum
+{
+ PROP_0,
+ PROP_PROXYSINK,
+};
+
+struct _GstProxySrcPrivate
+{
+ /* Queue to hold buffers from proxysink */
+ GstElement *queue;
+ /* Source pad of the above queue and the proxysrc element itself */
+ GstPad *srcpad;
+ /* Our internal srcpad that proxysink pushes buffers/events/queries into */
+ GstPad *internal_srcpad;
+ /* An unlinked dummy sinkpad; see gst_proxy_src_init() */
+ GstPad *dummy_sinkpad;
+ /* The matching proxysink; queries and events are sent to its sinkpad */
+ GWeakRef proxysink;
+};
+
+/* We're not subclassing from basesrc because we don't want any of the special
+ * handling it has for events/queries/etc. We just pass-through everything. */
+
+/* Our parent type is a GstBin instead of GstElement because we contain a queue
+ * element */
+#define parent_class gst_proxy_src_parent_class
+G_DEFINE_TYPE (GstProxySrc, gst_proxy_src, GST_TYPE_BIN);
+
+static gboolean gst_proxy_src_internal_src_query (GstPad * pad,
+ GstObject * parent, GstQuery * query);
+static gboolean gst_proxy_src_internal_src_event (GstPad * pad,
+ GstObject * parent, GstEvent * event);
+
+static GstStateChangeReturn gst_proxy_src_change_state (GstElement * element,
+ GstStateChange transition);
+static void gst_proxy_src_dispose (GObject * object);
+
+static void
+gst_proxy_src_get_property (GObject * object, guint prop_id, GValue * value,
+ GParamSpec * spec)
+{
+ GstProxySrc *self = GST_PROXY_SRC (object);
+
+ switch (prop_id) {
+ case PROP_PROXYSINK:
+ g_value_take_object (value, g_weak_ref_get (&self->priv->proxysink));
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, spec);
+ break;
+ }
+}
+
+static void
+gst_proxy_src_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * spec)
+{
+ GstProxySrc *self = GST_PROXY_SRC (object);
+ GstProxySink *sink;
+
+ switch (prop_id) {
+ case PROP_PROXYSINK:
+ sink = g_value_dup_object (value);
+ if (sink == NULL) {
+ /* Unset proxysrc property on the existing proxysink to break the
+ * connection in that direction */
+ GstProxySink *old_sink = g_weak_ref_get (&self->priv->proxysink);
+ if (old_sink) {
+ gst_proxy_sink_set_proxysrc (old_sink, NULL);
+ g_object_unref (old_sink);
+ }
+ g_weak_ref_set (&self->priv->proxysink, NULL);
+ } else {
+ /* Set proxysrc property on the new proxysink to point to us */
+ gst_proxy_sink_set_proxysrc (sink, self);
+ g_weak_ref_set (&self->priv->proxysink, sink);
+ g_object_unref (sink);
+ }
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, spec);
+ }
+}
+
+static void
+gst_proxy_src_class_init (GstProxySrcClass * klass)
+{
+ GObjectClass *gobject_class = (GObjectClass *) klass;
+ GstElementClass *gstelement_class = (GstElementClass *) klass;
+
+ GST_DEBUG_CATEGORY_INIT (gst_proxy_src_debug, "proxysrc", 0, "proxy sink");
+
+ g_type_class_add_private (klass, sizeof (GstProxySrcPrivate));
+
+ gobject_class->dispose = gst_proxy_src_dispose;
+
+ gobject_class->get_property = gst_proxy_src_get_property;
+ gobject_class->set_property = gst_proxy_src_set_property;
+
+ g_object_class_install_property (gobject_class, PROP_PROXYSINK,
+ g_param_spec_object ("proxysink", "Proxysink", "Matching proxysink",
+ GST_TYPE_PROXY_SINK, G_PARAM_READWRITE));
+
+ gstelement_class->change_state = gst_proxy_src_change_state;
+ gst_element_class_add_pad_template (gstelement_class,
+ gst_static_pad_template_get (&src_template));
+
+ gst_element_class_set_static_metadata (gstelement_class, "Proxy source",
+ "Source", "Proxy source for internal process communication",
+ "Sebastian Dröge <sebastian@centricular.com>");
+}
+
+static void
+gst_proxy_src_init (GstProxySrc * self)
+{
+ GstPad *srcpad, *sinkpad;
+ GstPadTemplate *templ;
+
+ GST_OBJECT_FLAG_SET (self, GST_ELEMENT_FLAG_SOURCE);
+
+ self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, GST_TYPE_PROXY_SRC,
+ GstProxySrcPrivate);
+
+ /* We feed incoming buffers into a queue to decouple the downstream pipeline
+ * from the upstream pipeline */
+ self->priv->queue = gst_element_factory_make ("queue", NULL);
+ gst_bin_add (GST_BIN (self), self->priv->queue);
+
+ srcpad = gst_element_get_static_pad (self->priv->queue, "src");
+ templ = gst_static_pad_template_get (&src_template);
+ self->priv->srcpad = gst_ghost_pad_new_from_template ("src", srcpad, templ);
+ gst_object_unref (templ);
+ gst_object_unref (srcpad);
+
+ gst_element_add_pad (GST_ELEMENT (self), self->priv->srcpad);
+
+ /* A dummy sinkpad that's not actually used anywhere
+ * Explanation for why this is needed is below */
+ self->priv->dummy_sinkpad = gst_pad_new ("dummy_sinkpad", GST_PAD_SINK);
+ gst_object_set_parent (GST_OBJECT (self->priv->dummy_sinkpad),
+ GST_OBJECT (self));
+
+ self->priv->internal_srcpad = gst_pad_new ("internal_src", GST_PAD_SRC);
+ gst_object_set_parent (GST_OBJECT (self->priv->internal_srcpad),
+ GST_OBJECT (self->priv->dummy_sinkpad));
+ gst_pad_set_event_function (self->priv->internal_srcpad,
+ gst_proxy_src_internal_src_event);
+ gst_pad_set_query_function (self->priv->internal_srcpad,
+ gst_proxy_src_internal_src_query);
+
+ /* We need to link internal_srcpad from proxysink to the sinkpad of our
+ * queue. However, two pads can only be linked if they share a common parent.
+ * Above, we set the parent of the dummy_sinkpad as proxysrc, and then we set
+ * the parent of internal_srcpad as dummy_sinkpad. This causes both these pads
+ * to share a parent allowing us to link them.
+ * Yes, this is a hack/workaround. */
+ sinkpad = gst_element_get_static_pad (self->priv->queue, "sink");
+ gst_pad_link (self->priv->internal_srcpad, sinkpad);
+ gst_object_unref (sinkpad);
+}
+
+static void
+gst_proxy_src_dispose (GObject * object)
+{
+ GstProxySrc *self = GST_PROXY_SRC (object);
+
+ gst_object_unparent (GST_OBJECT (self->priv->dummy_sinkpad));
+ self->priv->dummy_sinkpad = NULL;
+
+ gst_object_unparent (GST_OBJECT (self->priv->internal_srcpad));
+ self->priv->internal_srcpad = NULL;
+
+ g_weak_ref_set (&self->priv->proxysink, NULL);
+
+ G_OBJECT_CLASS (gst_proxy_src_parent_class)->dispose (object);
+}
+
+static GstStateChangeReturn
+gst_proxy_src_change_state (GstElement * element, GstStateChange transition)
+{
+ GstElementClass *gstelement_class =
+ GST_ELEMENT_CLASS (gst_proxy_src_parent_class);
+ GstProxySrc *self = GST_PROXY_SRC (element);
+ GstStateChangeReturn ret;
+
+ ret = gstelement_class->change_state (element, transition);
+ if (ret == GST_STATE_CHANGE_FAILURE)
+ return ret;
+
+ switch (transition) {
+ case GST_STATE_CHANGE_READY_TO_PAUSED:
+ ret = GST_STATE_CHANGE_NO_PREROLL;
+ gst_pad_set_active (self->priv->internal_srcpad, TRUE);
+ break;
+ case GST_STATE_CHANGE_PAUSED_TO_READY:
+ gst_pad_set_active (self->priv->internal_srcpad, FALSE);
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static gboolean
+gst_proxy_src_internal_src_query (GstPad * pad, GstObject * parent,
+ GstQuery * query)
+{
+ GstProxySrc *self = GST_PROXY_SRC (gst_object_get_parent (parent));
+ GstProxySink *sink;
+ gboolean ret = FALSE;
+
+ if (!self)
+ return ret;
+
+ GST_LOG_OBJECT (pad, "Handling query of type '%s'",
+ gst_query_type_get_name (GST_QUERY_TYPE (query)));
+
+ sink = g_weak_ref_get (&self->priv->proxysink);
+ if (sink) {
+ GstPad *sinkpad;
+ sinkpad = gst_proxy_sink_get_internal_sinkpad (sink);
+
+ ret = gst_pad_peer_query (sinkpad, query);
+ gst_object_unref (sinkpad);
+ gst_object_unref (sink);
+ }
+
+ gst_object_unref (self);
+
+ return ret;
+}
+
+static gboolean
+gst_proxy_src_internal_src_event (GstPad * pad, GstObject * parent,
+ GstEvent * event)
+{
+ GstProxySrc *self = GST_PROXY_SRC (gst_object_get_parent (parent));
+ GstProxySink *sink;
+ gboolean ret = FALSE;
+
+ if (!self)
+ return ret;
+
+ GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
+
+ sink = g_weak_ref_get (&self->priv->proxysink);
+ if (sink) {
+ GstPad *sinkpad;
+ sinkpad = gst_proxy_sink_get_internal_sinkpad (sink);
+
+ ret = gst_pad_push_event (sinkpad, event);
+ gst_object_unref (sinkpad);
+ gst_object_unref (sink);
+ } else
+ gst_event_unref (event);
+
+
+ gst_object_unref (self);
+
+ return ret;
+}
+
+/* Wrapper function for accessing private member */
+GstPad *
+gst_proxy_src_get_internal_srcpad (GstProxySrc * self)
+{
+ return gst_object_ref (self->priv->internal_srcpad);
+}
diff --git a/gst/proxy/gstproxysrc.h b/gst/proxy/gstproxysrc.h
new file mode 100644
index 000000000..cc8577fc2
--- /dev/null
+++ b/gst/proxy/gstproxysrc.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2015 Centricular Ltd.
+ * Author: Sebastian Dröge <sebastian@centricular.com>
+ * Author: Nirbheek Chauhan <nirbheek@centricular.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.
+ */
+
+#ifndef __GST_PROXY_SRC_H__
+#define __GST_PROXY_SRC_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_PROXY_SRC (gst_proxy_src_get_type())
+#define GST_PROXY_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_PROXY_SRC, GstProxySrc))
+#define GST_IS_PROXY_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_PROXY_SRC))
+#define GST_PROXY_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) , GST_TYPE_PROXY_SRC, GstProxySrcClass))
+#define GST_IS_PROXY_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) , GST_TYPE_PROXY_SRC))
+#define GST_PROXY_SRC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) , GST_TYPE_PROXY_SRC, GstProxySrcClass))
+
+typedef struct _GstProxySrc GstProxySrc;
+typedef struct _GstProxySrcClass GstProxySrcClass;
+typedef struct _GstProxySrcPrivate GstProxySrcPrivate;
+
+struct _GstProxySrc {
+ GstBin parent;
+
+ /* < private > */
+ GstProxySrcPrivate *priv;
+ gpointer _gst_reserved[GST_PADDING];
+};
+
+struct _GstProxySrcClass {
+ GstBinClass parent_class;
+};
+
+GType gst_proxy_src_get_type(void);
+
+G_END_DECLS
+
+#endif /* __GST_PROXY_SRC_H__ */
diff --git a/gst/proxy/meson.build b/gst/proxy/meson.build
new file mode 100644
index 000000000..769727816
--- /dev/null
+++ b/gst/proxy/meson.build
@@ -0,0 +1,14 @@
+proxy_sources = [
+ 'gstproxy.c',
+ 'gstproxysink.c',
+ 'gstproxysrc.c'
+]
+
+gstproxy = library('gstproxy',
+ proxy_sources,
+ c_args : gst_plugins_bad_args,
+ include_directories : [configinc],
+ dependencies : [gstbase_dep],
+ install : true,
+ install_dir : plugins_install_dir,
+)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 08:27:40 +0000