Long live Qt!

1 files changed, 456 insertions, 0 deletions

diff --git a/src/3rdparty/phonon/gstreamer/medianode.cpp b/src/3rdparty/phonon/gstreamer/medianode.cpp
new file mode 100644
index 0000000..7257972
--- /dev/null
+++ b/src/3rdparty/phonon/gstreamer/medianode.cpp
@@ -0,0 +1,456 @@
+/*  This file is part of the KDE project.
+
+    Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+
+    This library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2.1 or 3 of the License.
+
+    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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "common.h"
+#include "medianode.h"
+#include "mediaobject.h"
+#include "message.h"
+#include "backend.h"
+#include "gsthelper.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace Phonon
+{
+namespace Gstreamer
+{
+
+MediaNode::MediaNode(Backend *backend, NodeDescription description) :
+        m_isValid(false),
+        m_root(0),
+        m_audioTee(0),
+        m_videoTee(0),
+        m_fakeAudioSink(0),
+        m_fakeVideoSink(0),
+        m_backend(backend),
+        m_description(description)
+{
+    if ((description & AudioSink) && (description & VideoSink)) {
+        Q_ASSERT(0); // A node cannot accept both audio and video
+    }
+
+    if (description & AudioSource) {
+        m_audioTee = gst_element_factory_make("tee", NULL);
+        gst_object_ref (GST_OBJECT (m_audioTee));
+        gst_object_sink (GST_OBJECT (m_audioTee));     
+
+        // Fake audio sink to swallow unconnected audio pads
+        m_fakeAudioSink = gst_element_factory_make("fakesink", NULL);
+        g_object_set (G_OBJECT (m_fakeAudioSink), "sync", TRUE, (const char*)NULL);
+        gst_object_ref (GST_OBJECT (m_fakeAudioSink));
+        gst_object_sink (GST_OBJECT (m_fakeAudioSink));
+    }
+
+    if (description & VideoSource) {
+        m_videoTee = gst_element_factory_make("tee", NULL);
+        gst_object_ref (GST_OBJECT (m_videoTee));
+        gst_object_sink (GST_OBJECT (m_videoTee));     
+
+        // Fake video sink to swallow unconnected video pads
+        m_fakeVideoSink = gst_element_factory_make("fakesink", NULL);
+        g_object_set (G_OBJECT (m_fakeVideoSink), "sync", TRUE, (const char*)NULL);
+        gst_object_ref (GST_OBJECT (m_fakeVideoSink));
+        gst_object_sink (GST_OBJECT (m_fakeVideoSink));
+    }
+}
+
+MediaNode::~MediaNode()
+{
+    if (m_videoTee) {
+        gst_element_set_state(m_videoTee, GST_STATE_NULL);
+        gst_object_unref(m_videoTee);
+    }
+
+    if (m_audioTee) {
+        gst_element_set_state(m_audioTee, GST_STATE_NULL);
+        gst_object_unref(m_audioTee);
+    }
+
+    if (m_fakeAudioSink) {
+        gst_element_set_state(m_fakeAudioSink, GST_STATE_NULL);
+        gst_object_unref(m_fakeAudioSink);
+    }
+
+    if (m_fakeVideoSink) {
+        gst_element_set_state(m_fakeVideoSink, GST_STATE_NULL);
+        gst_object_unref(m_fakeVideoSink);
+    }
+}
+
+
+/**
+ * Connects children recursively from a mediaobject root
+ */
+bool MediaNode::buildGraph()
+{
+    Q_ASSERT(root()); //We cannot build the graph without a root element source
+
+    bool success = link();
+
+    if (success) {
+        // connect children recursively
+        for (int i=0; i< m_audioSinkList.size(); ++i) {
+            if (MediaNode *node = qobject_cast<MediaNode*>(m_audioSinkList[i])) {
+                node->setRoot(root());
+                if (!node->buildGraph())
+                    success = false;
+            }
+        }
+
+        for (int i=0; i < m_videoSinkList.size(); ++i) {
+            if (MediaNode *node = qobject_cast<MediaNode*>(m_videoSinkList[i])) {
+                node->setRoot(root());
+                if (!node->buildGraph())
+                    success = false;
+            }
+        }
+    }
+
+    if (!success)
+        unlink();
+
+    return success;
+}
+
+/**
+ *  Disconnects children recursively
+ */
+bool MediaNode::breakGraph()
+{
+    for (int i=0; i<m_audioSinkList.size(); ++i) {
+        MediaNode *node = qobject_cast<MediaNode*>(m_audioSinkList[i]);
+        if (!node || !node->breakGraph())
+            return false;
+        node->setRoot(0);
+    }
+
+    for (int i=0; i <m_videoSinkList.size(); ++i) {
+        MediaNode *node = qobject_cast<MediaNode*>(m_videoSinkList[i]);
+        if (!node || !node->breakGraph())
+            return false;
+        node->setRoot(0);
+    }
+    unlink();
+    return true;
+}
+
+bool MediaNode::connectNode(QObject *obj)
+{
+    MediaNode *sink = qobject_cast<MediaNode*>(obj);
+
+    bool success = false;
+
+    if (sink) {
+
+        if (!sink->isValid()) {
+            m_backend->logMessage(QString("Trying to link to an invalid node (%0)").arg(sink->name()), Backend::Warning);
+            return false;
+        }
+
+        if (sink->root()) {
+            m_backend->logMessage("Trying to link a node that is already linked to a different mediasource ", Backend::Warning);
+            return false;
+        }
+
+        if ((m_description & AudioSource) && (sink->m_description & AudioSink)) {
+            m_audioSinkList << obj;
+            MediaNodeEvent event(MediaNodeEvent::AudioSinkAdded, sink);
+            root()->mediaNodeEvent(&event);
+            success = true;
+        }
+
+        if ((m_description & VideoSource) && (sink->m_description & VideoSink)) {
+            m_videoSinkList << obj;
+            MediaNodeEvent event(MediaNodeEvent::VideoSinkAdded, sink);
+            root()->mediaNodeEvent(&event);
+            success = true;
+        }
+
+        // If we have a root source, and we are connected
+        // try to link the gstreamer elements
+        if (success && root()) {
+            MediaNodeEvent mediaObjectConnected(MediaNodeEvent::MediaObjectConnected, root());
+            notify(&mediaObjectConnected);
+            root()->buildGraph();
+        }
+    }
+    return success;
+}
+
+bool MediaNode::disconnectNode(QObject *obj)
+{
+    MediaNode *sink = qobject_cast<MediaNode*>(obj);
+    if (root()) {
+        // Disconnecting elements while playing or paused seems to cause
+        // potential deadlock. Hence we force the pipeline into ready state
+        // before any nodes are disconnected.
+        gst_element_set_state(root()->pipeline(), GST_STATE_READY);    
+
+        Q_ASSERT(sink->root()); //sink has to have a root since it is onnected
+
+        if (sink->description() & (AudioSink)) {
+            GstPad *sinkPad = gst_element_get_pad(sink->audioElement(), "sink");
+            // Release requested src pad from tee
+            GstPad *requestedPad = gst_pad_get_peer(sinkPad);
+            if (requestedPad) {
+                gst_element_release_request_pad(m_audioTee, requestedPad);
+                gst_object_unref(requestedPad);
+            }
+            if (GST_ELEMENT_PARENT(sink->audioElement()))
+                gst_bin_remove(GST_BIN(root()->audioGraph()), sink->audioElement());
+            gst_object_unref(sinkPad);
+        }
+
+        if (sink->description() & (VideoSink)) {
+            GstPad *sinkPad = gst_element_get_pad(sink->videoElement(), "sink");
+            // Release requested src pad from tee
+            GstPad *requestedPad = gst_pad_get_peer(sinkPad);
+            if (requestedPad) {
+                gst_element_release_request_pad(m_videoTee, requestedPad);
+                gst_object_unref(requestedPad);
+            }
+            if (GST_ELEMENT_PARENT(sink->videoElement()))
+                gst_bin_remove(GST_BIN(root()->videoGraph()), sink->videoElement());
+            gst_object_unref(sinkPad);
+        }
+
+        sink->breakGraph();
+        sink->setRoot(0);
+    }
+
+    m_videoSinkList.removeAll(obj);
+    m_audioSinkList.removeAll(obj);
+
+    if (sink->m_description & AudioSink) {
+        // Remove sink from graph
+        MediaNodeEvent event(MediaNodeEvent::AudioSinkRemoved, sink);
+        mediaNodeEvent(&event);
+        return true;
+    }
+
+    if ((m_description & VideoSource) && (sink->m_description & VideoSink)) {
+        // Remove sink from graph
+        MediaNodeEvent event(MediaNodeEvent::VideoSinkRemoved, sink);
+        mediaNodeEvent(&event);
+        return true;
+    }
+
+    return false;
+}
+
+void MediaNode::mediaNodeEvent(const MediaNodeEvent *) {}
+
+/**
+ * Propagates an event down the graph
+ * sender is responsible for deleting the event
+ */
+void MediaNode::notify(const MediaNodeEvent *event)
+{
+    Q_ASSERT(event);
+    mediaNodeEvent(event);
+    for (int i=0; i<m_audioSinkList.size(); ++i) {
+        MediaNode *node = qobject_cast<MediaNode*>(m_audioSinkList[i]);
+        node->notify(event);
+    }
+
+    for (int i=0; i<m_videoSinkList.size(); ++i) {
+        MediaNode *node = qobject_cast<MediaNode*>(m_videoSinkList[i]);
+        node->notify(event);
+    }
+}
+
+/*
+ * Requests a new tee pad and connects a node to it
+ */
+bool MediaNode::addOutput(MediaNode *output, GstElement *tee)
+{
+    Q_ASSERT(root());
+
+    bool success = true;
+
+    GstElement *sinkElement = 0;
+    if (output->description() & AudioSink)
+        sinkElement = output->audioElement();
+    else if (output->description() & VideoSink)
+        sinkElement = output->videoElement();
+
+    Q_ASSERT(sinkElement);
+
+    if (!sinkElement)
+        return false;
+
+    GstState state = GST_STATE (root()->pipeline());
+    GstPad *srcPad = gst_element_get_request_pad (tee, "src%d");
+    GstPad *sinkPad = gst_element_get_pad (sinkElement, "sink");
+
+    if (!sinkPad) {
+        success = false;
+    } else if (gst_pad_is_linked(sinkPad)) {
+        gst_object_unref (GST_OBJECT (sinkPad));
+        gst_object_unref (GST_OBJECT (srcPad));
+        return true;
+    }
+
+    if (success) {
+        if (output->description() & AudioSink)
+            gst_bin_add(GST_BIN(root()->audioGraph()), sinkElement);
+        else if (output->description() & VideoSink)
+            gst_bin_add(GST_BIN(root()->videoGraph()), sinkElement);
+    }
+
+    if (success) {
+        gst_pad_link(srcPad, sinkPad);
+        gst_element_set_state(sinkElement, state);
+    } else {
+        gst_element_release_request_pad(tee, srcPad);
+    }
+
+    gst_object_unref (GST_OBJECT (srcPad));
+    gst_object_unref (GST_OBJECT (sinkPad));
+
+    return success;
+}
+
+// Used to seal up unconnected source nodes by connecting unconnected src pads to fake sinks
+bool MediaNode::connectToFakeSink(GstElement *tee, GstElement *sink, GstElement *bin)
+{
+    bool success = true;
+    GstPad *sinkPad = gst_element_get_pad (sink, "sink");
+
+    if (GST_PAD_IS_LINKED (sinkPad)) {
+        //This fakesink is already connected
+        gst_object_unref (sinkPad);
+        return true;
+    }
+
+    GstPad *srcPad = gst_element_get_request_pad (tee, "src%d");
+    gst_bin_add(GST_BIN(bin), sink);
+    if (success)
+        success = (gst_pad_link (srcPad, sinkPad) == GST_PAD_LINK_OK);
+    if (success)
+        success = (gst_element_set_state(sink, GST_STATE(bin)) != GST_STATE_CHANGE_FAILURE);
+    gst_object_unref (srcPad);
+    gst_object_unref (sinkPad);
+    return success;
+}
+
+// Used to seal up unconnected source nodes by connecting unconnected src pads to fake sinks
+bool MediaNode::releaseFakeSinkIfConnected(GstElement *tee, GstElement *fakesink, GstElement *bin)
+{
+    if (GST_ELEMENT_PARENT(fakesink) == GST_ELEMENT(bin)) {
+        GstPad *sinkPad = gst_element_get_pad(fakesink, "sink");
+
+        // Release requested src pad from tee
+        GstPad *requestedPad = gst_pad_get_peer(sinkPad);
+        if (requestedPad) {
+            gst_element_release_request_pad(tee, requestedPad);
+            gst_object_unref(requestedPad);
+        }
+        gst_object_unref(sinkPad);
+
+        gst_element_set_state(fakesink, GST_STATE_NULL);
+        gst_bin_remove(GST_BIN(bin), fakesink);
+        Q_ASSERT(!GST_ELEMENT_PARENT(fakesink));
+    }
+    return true;
+}
+
+bool MediaNode::linkMediaNodeList(QList<QObject *> &list, GstElement *bin, GstElement *tee, GstElement *fakesink, GstElement *src)
+{
+    if (!GST_ELEMENT_PARENT(tee)) {
+        gst_bin_add(GST_BIN(bin), tee);
+        if (!gst_element_link_pads(src, "src", tee, "sink"))
+            return false;
+        gst_element_set_state(tee, GST_STATE(bin));
+    }
+    if (list.isEmpty()) {
+        //connect node to a fake sink to avoid clogging the pipeline
+        if (!connectToFakeSink(tee, fakesink, bin))
+            return false;
+    } else {
+        // Remove fake sink if previously connected
+        if (!releaseFakeSinkIfConnected(tee, fakesink, bin))
+            return false;
+
+        for (int i = 0 ; i < list.size() ; ++i) {
+            QObject *sink = list[i];
+            if (MediaNode *output = qobject_cast<MediaNode*>(sink)) {
+                if (!addOutput(output, tee))
+                    return false;
+            }
+        }
+    }
+    return true;
+}
+
+bool MediaNode::link()
+{
+    // Rewire everything
+    if ((description() & AudioSource)) {
+        if (!linkMediaNodeList(m_audioSinkList, root()->audioGraph(), m_audioTee, m_fakeAudioSink, audioElement()))
+            return false;
+    }
+
+    if ((description() & VideoSource)) {
+        if (!linkMediaNodeList(m_videoSinkList, root()->videoGraph(), m_videoTee, m_fakeVideoSink, videoElement()))
+            return false;
+    }
+    return true;
+}
+
+bool MediaNode::unlink()
+{
+    Q_ASSERT(root());
+    if (description() & AudioSource) {
+        if (GST_ELEMENT_PARENT(m_audioTee) == GST_ELEMENT(root()->audioGraph())) {
+           gst_element_set_state(m_audioTee, GST_STATE_NULL);    
+           gst_bin_remove(GST_BIN(root()->audioGraph()), m_audioTee);
+       }
+        for (int i=0; i<m_audioSinkList.size(); ++i) {
+            QObject *audioSink = m_audioSinkList[i];
+            if (MediaNode *output = qobject_cast<MediaNode*>(audioSink)) {
+                GstElement *element = output->audioElement();
+                if (GST_ELEMENT_PARENT(element) == GST_ELEMENT(root()->audioGraph())) {
+                    gst_element_set_state(element, GST_STATE_NULL);    
+                    gst_bin_remove(GST_BIN(root()->audioGraph()), element);
+                }
+            }
+        }
+    } else if (description() & VideoSource) {
+        if (GST_ELEMENT_PARENT(m_videoTee) == GST_ELEMENT(root()->videoGraph())) {
+           gst_element_set_state(m_videoTee, GST_STATE_NULL);    
+           gst_bin_remove(GST_BIN(root()->videoGraph()), m_videoTee);
+        }
+        for (int i=0; i <m_videoSinkList.size(); ++i) {
+            QObject *videoSink = m_videoSinkList[i];
+            if (MediaNode *vw = qobject_cast<MediaNode*>(videoSink)) {
+                GstElement *element = vw->videoElement();
+                if (GST_ELEMENT_PARENT(element) == GST_ELEMENT(root()->videoGraph())) {
+                    gst_element_set_state(element, GST_STATE_NULL);    
+                    gst_bin_remove(GST_BIN(root()->videoGraph()), element);
+                }
+            }
+        }
+    }
+    return true;
+}
+
+
+} // ns Gstreamer
+} // ns Phonon
+
+QT_END_NAMESPACE