// -------------------------------------------------------- //
// implementation for BMediaEventLooper
// -------------------------------------------------------- //
// protected:
status_t MediaReader::HandleBuffer(
const media_timed_event *event,
bigtime_t lateness,
bool realTimeEvent)
{
CALLED();
if (output.destination == media_destination::null)
return B_MEDIA_NOT_CONNECTED;
status_t status = B_OK;
BBuffer * buffer = fBufferGroup->RequestBuffer(output.format.u.multistream.max_chunk_size,fBufferPeriod);
if (buffer != 0) {
status = FillFileBuffer(buffer);
if (status != B_OK) {
PRINT("MediaReader::HandleEvent got an error from FillFileBuffer.\n");
buffer->Recycle();
} else {
if (fOutputEnabled) {
status = SendBuffer(buffer,output.destination);
if (status != B_OK) {
PRINT("MediaReader::HandleEvent got an error from SendBuffer.\n");
buffer->Recycle();
}
} else {
buffer->Recycle();
}
}
}
bigtime_t nextEventTime = event->event_time+fBufferPeriod;
media_timed_event nextBufferEvent(nextEventTime, BTimedEventQueue::B_HANDLE_BUFFER);
EventQueue()->AddEvent(nextBufferEvent);
return status;
}
status_t
ClientNode::_ScheduleOutputEvent(bigtime_t event)
{
media_timed_event nextBufferEvent(event, NEW_BUFFER_EVENT);
EventQueue()->AddEvent(nextBufferEvent);
}
void
AudioProducer::HandleEvent(const media_timed_event* event, bigtime_t lateness,
bool realTimeEvent)
{
TRACE_BUFFER("%p->AudioProducer::HandleEvent()\n", this);
switch (event->type) {
case BTimedEventQueue::B_START:
TRACE("AudioProducer::HandleEvent(B_START)\n");
if (RunState() != B_STARTED) {
fFramesSent = 0;
fStartTime = event->event_time + fSupplier->InitialLatency();
printf("B_START: start time: %lld\n", fStartTime);
media_timed_event firstBufferEvent(
fStartTime - fSupplier->InitialLatency(),
BTimedEventQueue::B_HANDLE_BUFFER);
EventQueue()->AddEvent(firstBufferEvent);
}
TRACE("AudioProducer::HandleEvent(B_START) done\n");
break;
case BTimedEventQueue::B_STOP:
TRACE("AudioProducer::HandleEvent(B_STOP)\n");
EventQueue()->FlushEvents(0, BTimedEventQueue::B_ALWAYS, true,
BTimedEventQueue::B_HANDLE_BUFFER);
TRACE("AudioProducer::HandleEvent(B_STOP) done\n");
break;
case BTimedEventQueue::B_HANDLE_BUFFER:
{
TRACE_BUFFER("AudioProducer::HandleEvent(B_HANDLE_BUFFER)\n");
if (RunState() == BMediaEventLooper::B_STARTED
&& fOutput.destination != media_destination::null) {
BBuffer* buffer = _FillNextBuffer(event->event_time);
if (buffer) {
status_t err = B_ERROR;
if (fOutputEnabled) {
err = SendBuffer(buffer, fOutput.source,
fOutput.destination);
}
if (err)
buffer->Recycle();
}
size_t sampleSize = fOutput.format.u.raw_audio.format
& media_raw_audio_format::B_AUDIO_SIZE_MASK;
size_t nFrames = fOutput.format.u.raw_audio.buffer_size
/ (sampleSize * fOutput.format.u.raw_audio.channel_count);
fFramesSent += nFrames;
fNextScheduledBuffer = fStartTime
+ bigtime_t(double(fFramesSent) * 1000000.0
/ double(fOutput.format.u.raw_audio.frame_rate));
media_timed_event nextBufferEvent(fNextScheduledBuffer,
BTimedEventQueue::B_HANDLE_BUFFER);
EventQueue()->AddEvent(nextBufferEvent);
} else {
ERROR("B_HANDLE_BUFFER, but not started!\n");
}
TRACE_BUFFER("AudioProducer::HandleEvent(B_HANDLE_BUFFER) done\n");
break;
}
default:
break;
}
}
// how should we handle late buffers? drop them?
// notify the producer?
status_t
SoundPlayNode::SendNewBuffer(const media_timed_event* event,
bigtime_t lateness, bool realTimeEvent)
{
CALLED();
// printf("latency = %12Ld, event = %12Ld, sched = %5Ld, arrive at %12Ld, now %12Ld, current lateness %12Ld\n", EventLatency() + SchedulingLatency(), EventLatency(), SchedulingLatency(), event->event_time, TimeSource()->Now(), lateness);
// make sure we're both started *and* connected before delivering a buffer
if (RunState() != BMediaEventLooper::B_STARTED
|| fOutput.destination == media_destination::null)
return B_OK;
// The event->event_time is the time at which the buffer we are preparing
// here should arrive at it's destination. The MediaEventLooper should have
// scheduled us early enough (based on EventLatency() and the
// SchedulingLatency()) to make this possible.
// lateness is independent of EventLatency()!
if (lateness > (BufferDuration() / 3) ) {
printf("SoundPlayNode::SendNewBuffer, event scheduled much too late, "
"lateness is %Ld\n", lateness);
}
// skip buffer creation if output not enabled
if (fOutputEnabled) {
// Get the next buffer of data
BBuffer* buffer = FillNextBuffer(event->event_time);
if (buffer) {
// If we are ready way too early, decrase internal latency
/*
bigtime_t how_early = event->event_time - TimeSource()->Now() - fLatency - fInternalLatency;
if (how_early > 5000) {
printf("SoundPlayNode::SendNewBuffer, event scheduled too early, how_early is %Ld\n", how_early);
if (fTooEarlyCount++ == 5) {
fInternalLatency -= how_early;
if (fInternalLatency < 500)
fInternalLatency = 500;
printf("SoundPlayNode::SendNewBuffer setting internal latency to %Ld\n", fInternalLatency);
SetEventLatency(fLatency + fInternalLatency);
fTooEarlyCount = 0;
}
}
*/
// send the buffer downstream if and only if output is enabled
if (SendBuffer(buffer, fOutput.source, fOutput.destination)
!= B_OK) {
// we need to recycle the buffer
// if the call to SendBuffer() fails
printf("SoundPlayNode::SendNewBuffer: Buffer sending "
"failed\n");
buffer->Recycle();
}
}
}
// track how much media we've delivered so far
size_t nFrames = fOutput.format.u.raw_audio.buffer_size
/ ((fOutput.format.u.raw_audio.format
& media_raw_audio_format::B_AUDIO_SIZE_MASK)
* fOutput.format.u.raw_audio.channel_count);
fFramesSent += nFrames;
// The buffer is on its way; now schedule the next one to go
// nextEvent is the time at which the buffer should arrive at it's
// destination
bigtime_t nextEvent = fStartTime + bigtime_t((1000000LL * fFramesSent)
/ (int32)fOutput.format.u.raw_audio.frame_rate);
media_timed_event nextBufferEvent(nextEvent, SEND_NEW_BUFFER_EVENT);
EventQueue()->AddEvent(nextBufferEvent);
return B_OK;
}
void
ToneProducer::HandleEvent(const media_timed_event* event, bigtime_t lateness, bool realTimeEvent)
{
// FPRINTF(stderr, "ToneProducer::HandleEvent\n");
switch (event->type)
{
case BTimedEventQueue::B_START:
// don't do anything if we're already running
if (RunState() != B_STARTED)
{
// We want to start sending buffers now, so we set up the buffer-sending bookkeeping
// and fire off the first "produce a buffer" event.
mFramesSent = 0;
mTheta = 0;
mStartTime = event->event_time;
media_timed_event firstBufferEvent(mStartTime, BTimedEventQueue::B_HANDLE_BUFFER);
// Alternatively, we could call HandleEvent() directly with this event, to avoid a trip through
// the event queue, like this:
//
// this->HandleEvent(&firstBufferEvent, 0, false);
//
EventQueue()->AddEvent(firstBufferEvent);
}
break;
case BTimedEventQueue::B_STOP:
FPRINTF(stderr, "Handling B_STOP event\n");
// When we handle a stop, we must ensure that downstream consumers don't
// get any more buffers from us. This means we have to flush any pending
// buffer-producing events from the queue.
EventQueue()->FlushEvents(0, BTimedEventQueue::B_ALWAYS, true, BTimedEventQueue::B_HANDLE_BUFFER);
break;
case _PARAMETER_EVENT:
{
size_t dataSize = size_t(event->data);
int32 param = int32(event->bigdata);
if (dataSize >= sizeof(float)) switch (param)
{
case FREQUENCY_PARAM:
{
float newValue = *((float*) event->user_data);
if (mFrequency != newValue) // an actual change in the value?
{
mFrequency = newValue;
mFreqLastChanged = TimeSource()->Now();
BroadcastNewParameterValue(mFreqLastChanged, param, &mFrequency, sizeof(mFrequency));
}
}
break;
case GAIN_PARAM:
{
float newValue = *((float*) event->user_data);
if (mGain != newValue)
{
mGain = newValue;
mGainLastChanged = TimeSource()->Now();
BroadcastNewParameterValue(mGainLastChanged, param, &mGain, sizeof(mGain));
}
}
break;
case WAVEFORM_PARAM:
{
int32 newValue = *((int32*) event->user_data);
if (mWaveform != newValue)
{
mWaveform = newValue;
mTheta = 0; // reset the generator parameters when we change waveforms
mWaveAscending = true;
mWaveLastChanged = TimeSource()->Now();
BroadcastNewParameterValue(mWaveLastChanged, param, &mWaveform, sizeof(mWaveform));
}
}
break;
default:
FPRINTF(stderr, "Hmmm... got a B_PARAMETER event for a parameter we don't have? (%" B_PRId32 ")\n", param);
break;
}
}
break;
case BTimedEventQueue::B_HANDLE_BUFFER:
{
// make sure we're both started *and* connected before delivering a buffer
if (RunState() == BMediaEventLooper::B_STARTED
&& mOutput.destination != media_destination::null) {
// Get the next buffer of data
BBuffer* buffer = FillNextBuffer(event->event_time);
if (buffer) {
// send the buffer downstream if and only if output is enabled
status_t err = B_ERROR;
if (mOutputEnabled) {
err = SendBuffer(buffer, mOutput.source,
mOutput.destination);
}
if (err) {
// we need to recycle the buffer ourselves if output is disabled or
// if the call to SendBuffer() fails
buffer->Recycle();
}
}
// track how much media we've delivered so far
size_t nFrames = mOutput.format.u.raw_audio.buffer_size /
(sizeof(float) * mOutput.format.u.raw_audio.channel_count);
mFramesSent += nFrames;
// The buffer is on its way; now schedule the next one to go
bigtime_t nextEvent = mStartTime + bigtime_t(double(mFramesSent)
/ double(mOutput.format.u.raw_audio.frame_rate) * 1000000.0);
media_timed_event nextBufferEvent(nextEvent,
BTimedEventQueue::B_HANDLE_BUFFER);
EventQueue()->AddEvent(nextBufferEvent);
}
}
break;
default:
break;
}
}
void
GameProducer::HandleEvent(const media_timed_event* event, bigtime_t lateness,
bool realTimeEvent)
{
// FPRINTF(stderr, "ToneProducer::HandleEvent\n");
switch (event->type)
{
case BTimedEventQueue::B_START:
// don't do anything if we're already running
if (RunState() != B_STARTED) {
// Going to start sending buffers so setup the needed bookkeeping
fFramesSent = 0;
fStartTime = event->event_time;
media_timed_event firstBufferEvent(fStartTime,
BTimedEventQueue::B_HANDLE_BUFFER);
// Alternatively, we could call HandleEvent() directly with this
// event, to avoid a trip through the event queue like this:
// this->HandleEvent(&firstBufferEvent, 0, false);
EventQueue()->AddEvent(firstBufferEvent);
}
break;
case BTimedEventQueue::B_STOP:
// When we handle a stop, we must ensure that downstream consumers don't
// get any more buffers from us. This means we have to flush any
// pending buffer-producing events from the queue.
EventQueue()->FlushEvents(0, BTimedEventQueue::B_ALWAYS, true,
BTimedEventQueue::B_HANDLE_BUFFER);
break;
case BTimedEventQueue::B_HANDLE_BUFFER:
{
// Ensure we're both started and connected before delivering buffer
if ((RunState() == BMediaEventLooper::B_STARTED)
&& (fOutput.destination != media_destination::null)) {
// Get the next buffer of data
BBuffer* buffer = FillNextBuffer(event->event_time);
if (buffer) {
// Send the buffer downstream if output is enabled
status_t err = B_ERROR;
if (fOutputEnabled) {
err = SendBuffer(buffer, fOutput.source,
fOutput.destination);
}
if (err) {
// we need to recycle the buffer ourselves if output is
// disabled or if the call to SendBuffer() fails
buffer->Recycle();
}
}
// track how much media we've delivered so far
size_t nFrames = fBufferSize / fFrameSize;
fFramesSent += nFrames;
// The buffer is on its way; now schedule the next one to go
bigtime_t nextEvent = fStartTime + bigtime_t(double(fFramesSent)
/ double(fOutput.format.u.raw_audio.frame_rate)
* 1000000.0);
media_timed_event nextBufferEvent(nextEvent,
BTimedEventQueue::B_HANDLE_BUFFER);
EventQueue()->AddEvent(nextBufferEvent);
}
}
break;
default:
break;
}
}
