foreach (QObject *object, objects) {
MediaNode *sourceNode = qobject_cast<MediaNode *>(object);
MediaObject *media = sourceNode->root();
if (media) {
media->saveState();
return true;
}
}
void MMF::MediaNode::updateMediaObject()
{
QList<MediaNode *> nodes;
MediaObject *mediaObject = 0;
// Traverse the graph, collecting a list of nodes, and locating
// the MediaObject node, if present
visit(nodes, mediaObject);
MediaNode *node = 0;
foreach(node, nodes)
node->setMediaObject(mediaObject);
}
/**
* 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);
}
}
void MMF::MediaNode::visit(QList<MediaNode *>& visited, MediaObject*& mediaObject)
{
if (isMediaObject()) {
// There can never be more than one MediaObject per graph, due to the
// mediaObjectMisMatch test in connectOutput().
Q_ASSERT_X(!mediaObject, Q_FUNC_INFO, "MediaObject already found");
mediaObject = static_cast<MediaObject *>(this);
}
visited += this;
if (m_input && !visited.contains(m_input))
m_input->visit(visited, mediaObject);
MediaNode *output = 0;
foreach (output, m_outputs)
if (!visited.contains(output))
output->visit(visited, mediaObject);
}
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;
}
/**
* 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::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;
}