status_t
GameSoundBuffer::StartPlaying()
{
if (fIsPlaying)
return EALREADY;
BMediaRoster* roster = BMediaRoster::Roster();
BTimeSource* source = roster->MakeTimeSourceFor(fConnection->producer);
// make sure we give the producer enough time to run buffers through
// the node chain, otherwise it'll start up already late
bigtime_t latency = 0;
status_t status = roster->GetLatencyFor(fConnection->producer, &latency);
if (status == B_OK)
status = roster->StartNode(fConnection->producer, source->Now() + latency);
source->Release();
fIsPlaying = true;
return status;
}
void
NodeHarnessWin::MessageReceived(BMessage *msg)
{
status_t err;
switch (msg->what)
{
case BUTTON_CONNECT:
mIsConnected = true;
// set the button states appropriately
mConnectButton->SetEnabled(false);
mStartButton->SetEnabled(true);
// set up the node network
{
BMediaRoster* r = BMediaRoster::Roster();
// find a node that can handle an audio file
#if TEST_WITH_AUDIO
entry_ref inRef;
dormant_node_info info;
::get_ref_for_path("/boot/optional/sound/virtual (void)", &inRef);
err = r->SniffRef(inRef, B_BUFFER_PRODUCER | B_FILE_INTERFACE, &info);
ErrorCheck(err, "couldn't find file reader node\n");
err = r->InstantiateDormantNode(info, &mConnection.producer, B_FLAVOR_IS_LOCAL);
ErrorCheck(err, "couldn't instantiate file reader node\n");
bigtime_t dummy_length; // output = media length; we don't use it
err = r->SetRefFor(mConnection.producer, inRef, false, &dummy_length);
ErrorCheck(err, "unable to SetRefFor() to read that sound file!\n");
#else
r->GetVideoInput(&mConnection.producer);
#endif
entry_ref logRef;
::get_ref_for_path("/tmp/node_log", &logRef);
mLogNode = new LoggingConsumer(logRef);
err = r->RegisterNode(mLogNode);
ErrorCheck(err, "unable to register LoggingConsumer node!\n");
// make sure the Media Roster knows that we're using the node
r->GetNodeFor(mLogNode->Node().node, &mConnection.consumer);
// trim down the log's verbosity a touch
mLogNode->SetEnabled(LOG_HANDLE_EVENT, false);
// fire off a window with the LoggingConsumer's controls in it
BParameterWeb* web;
r->GetParameterWebFor(mConnection.consumer, &web);
BView* view = BMediaTheme::ViewFor(web);
BWindow* win = new BWindow(BRect(250, 200, 300, 300), "Controls",
B_TITLED_WINDOW, B_ASYNCHRONOUS_CONTROLS);
win->AddChild(view);
win->ResizeTo(view->Bounds().Width(), view->Bounds().Height());
win->Show();
// set the nodes' time sources
r->GetTimeSource(&mTimeSource);
r->SetTimeSourceFor(mConnection.consumer.node, mTimeSource.node);
r->SetTimeSourceFor(mConnection.producer.node, mTimeSource.node);
// got the nodes; now we find the endpoints of the connection
media_input logInput;
media_output soundOutput;
int32 count;
err = r->GetFreeOutputsFor(mConnection.producer, &soundOutput, 1, &count);
ErrorCheck(err, "unable to get a free output from the producer node");
err = r->GetFreeInputsFor(mConnection.consumer, &logInput, 1, &count);
ErrorCheck(err, "unable to get a free input to the LoggingConsumer");
// fill in the rest of the Connection object
mConnection.source = soundOutput.source;
mConnection.destination = logInput.destination;
// got the endpoints; now we connect it!
media_format format;
#if TEST_WITH_AUDIO
format.type = B_MEDIA_RAW_AUDIO; // !!! hmmm.. how to fully wildcard this?
format.u.raw_audio = media_raw_audio_format::wildcard;
#else
format.type = B_MEDIA_RAW_VIDEO; // !!! hmmm.. how to fully wildcard this?
format.u.raw_video = media_raw_video_format::wildcard;
#endif
err = r->Connect(mConnection.source, mConnection.destination, &format, &soundOutput, &logInput);
ErrorCheck(err, "unable to connect nodes");
mConnection.format = format;
// for video input, we need to set the downstream latency for record -> playback
bigtime_t latency;
r->GetLatencyFor(mConnection.producer, &latency);
printf("Setting producer run mode latency to %" B_PRIdBIGTIME "\n", latency);
r->SetProducerRunModeDelay(mConnection.producer, latency + 6000);
// preroll first, to be a good citizen
r->PrerollNode(mConnection.consumer);
r->PrerollNode(mConnection.producer);
// start the LoggingConsumer and leave it running
BTimeSource* ts = r->MakeTimeSourceFor(mTimeSource);
r->StartNode(mConnection.consumer, ts->Now());
ts->Release();
}
break;
case BUTTON_START:
mStartButton->SetEnabled(false);
mStopButton->SetEnabled(true);
// start the consumer running
{
bigtime_t latency;
BMediaRoster* r = BMediaRoster::Roster();
BTimeSource* ts = r->MakeTimeSourceFor(mConnection.consumer);
r->GetLatencyFor(mConnection.producer, &latency);
r->StartNode(mConnection.producer, ts->Now() + latency);
ts->Release();
mIsRunning = true;
}
break;
case BUTTON_STOP:
StopNodes();
break;
default:
BWindow::MessageReceived(msg);
break;
}
}
void
NodeHarnessWin::MessageReceived(BMessage *msg)
{
status_t err;
switch (msg->what)
{
case BUTTON_CONNECT:
mIsConnected = true;
// set the button states appropriately
mConnectButton->SetEnabled(false);
mStartButton->SetEnabled(true);
// set up the node network
{
BMediaRoster* r = BMediaRoster::Roster();
// connect to the mixer
err = r->GetAudioMixer(&mConnection.consumer);
ErrorCheck(err, "unable to get the system mixer");
// fire off a window with the ToneProducer's controls in it
BParameterWeb* web;
r->GetParameterWebFor(mConnection.producer, &web);
BView* view = BMediaTheme::ViewFor(web);
BWindow* win = new BWindow(BRect(250, 200, 300, 300), "Controls",
B_TITLED_WINDOW, B_ASYNCHRONOUS_CONTROLS);
win->AddChild(view);
win->ResizeTo(view->Bounds().Width(), view->Bounds().Height());
win->Show();
// set the producer's time source to be the "default" time source, which
// the Mixer uses too.
r->GetTimeSource(&mTimeSource);
r->SetTimeSourceFor(mConnection.producer.node, mTimeSource.node);
// got the nodes; now we find the endpoints of the connection
media_input mixerInput;
media_output soundOutput;
int32 count = 1;
err = r->GetFreeOutputsFor(mConnection.producer, &soundOutput, 1, &count);
ErrorCheck(err, "unable to get a free output from the producer node");
count = 1;
err = r->GetFreeInputsFor(mConnection.consumer, &mixerInput, 1, &count);
ErrorCheck(err, "unable to get a free input to the mixer");
// got the endpoints; now we connect it!
media_format format;
format.type = B_MEDIA_RAW_AUDIO;
format.u.raw_audio = media_raw_audio_format::wildcard;
err = r->Connect(soundOutput.source, mixerInput.destination, &format, &soundOutput, &mixerInput);
ErrorCheck(err, "unable to connect nodes");
// the inputs and outputs might have been reassigned during the
// nodes' negotiation of the Connect(). That's why we wait until
// after Connect() finishes to save their contents.
mConnection.format = format;
mConnection.source = soundOutput.source;
mConnection.destination = mixerInput.destination;
// Set an appropriate run mode for the producer
r->SetRunModeNode(mConnection.producer, BMediaNode::B_INCREASE_LATENCY);
}
break;
case BUTTON_START:
mStartButton->SetEnabled(false);
mStopButton->SetEnabled(true);
// start the producer running
{
BMediaRoster* r = BMediaRoster::Roster();
BTimeSource* ts = r->MakeTimeSourceFor(mConnection.producer);
if (!ts)
{
fprintf(stderr, "* ERROR - MakeTimeSourceFor(producer) returned NULL!\n");
exit(1);
}
// make sure we give the producer enough time to run buffers through
// the node chain, otherwise it'll start up already late
bigtime_t latency = 0;
r->GetLatencyFor(mConnection.producer, &latency);
r->StartNode(mConnection.producer, ts->Now() + latency);
ts->Release();
mIsRunning = true;
}
break;
case BUTTON_STOP:
StopNodes();
break;
default:
BWindow::MessageReceived(msg);
break;
}
}