C++ BBuffer::Data方法代码示例

BBuffer*
SoundPlayNode::FillNextBuffer(bigtime_t eventTime)
{
	CALLED();

	// get a buffer from our buffer group
	BBuffer* buffer = fBufferGroup->RequestBuffer(
		fOutput.format.u.raw_audio.buffer_size, BufferDuration() / 2);

	// If we fail to get a buffer (for example, if the request times out), we
	// skip this buffer and go on to the next, to avoid locking up the control
	// thread
	if (buffer == NULL) {
		ERROR("SoundPlayNode::FillNextBuffer: RequestBuffer failed\n");
		return NULL;
	}

	if (fPlayer->HasData()) {
		fPlayer->PlayBuffer(buffer->Data(),
			fOutput.format.u.raw_audio.buffer_size, fOutput.format.u.raw_audio);
	} else
		memset(buffer->Data(), 0, fOutput.format.u.raw_audio.buffer_size);

	// fill in the buffer header
	media_header* header = buffer->Header();
	header->type = B_MEDIA_RAW_AUDIO;
	header->size_used = fOutput.format.u.raw_audio.buffer_size;
	header->time_source = TimeSource()->ID();
	header->start_time = eventTime;

	return buffer;
}

BBuffer*
GameProducer::FillNextBuffer(bigtime_t event_time)
{
	// get a buffer from our buffer group
	BBuffer* buf = fBufferGroup->RequestBuffer(fBufferSize, BufferDuration());

	// if we fail to get a buffer (for example, if the request times out), we
	// skip this buffer and go on to the next, to avoid locking up the control
	// thread.
	if (!buf)
		return NULL;

	// we need to discribe the buffer
	int64 frames = int64(fBufferSize / fFrameSize);
	memset(buf->Data(), 0, fBufferSize);

	// now fill the buffer with data, continuing where the last buffer left off
	fObject->Play(buf->Data(), frames);

	// fill in the buffer header
	media_header* hdr = buf->Header();
	hdr->type = B_MEDIA_RAW_AUDIO;
	hdr->size_used = fBufferSize;
	hdr->time_source = TimeSource()->ID();

	bigtime_t stamp;
	if (RunMode() == B_RECORDING) {
		// In B_RECORDING mode, we stamp with the capture time.  We're not
		// really a hardware capture node, but we simulate it by using the
		// (precalculated) time at which this buffer "should" have been created.
		stamp = event_time;
	} else {
		// okay, we're in one of the "live" performance run modes.  in these
		// modes, we stamp the buffer with the time at which the buffer should
		// be rendered to the output, not with the capture time. fStartTime is
		// the cached value of the first buffer's performance time; we calculate
		// this buffer's performance time as an offset from that time, based on
		// the amount of media we've created so far.
		// Recalculating every buffer like this avoids accumulation of error.
		stamp = fStartTime + bigtime_t(double(fFramesSent)
			/ double(fOutput.format.u.raw_audio.frame_rate) * 1000000.0);
	}
	hdr->start_time = stamp;

	return buf;
}

void
FireWireDVNode::card_reader_thread()
{
	status_t err;
	size_t rbufsize;
	int rcount;

	fCard->GetBufInfo(&rbufsize, &rcount);
	delete fBufferGroupEncVideo;
	fBufferGroupEncVideo = new BBufferGroup(rbufsize, rcount);
	while (!fTerminateThreads) {
		void *data, *end;
		ssize_t sizeUsed = fCard->Read(&data);
		if (sizeUsed < 0) {
			TRACE("FireWireDVNode::%s: %s\n", __FUNCTION__,
				strerror(sizeUsed));
			continue;
		}

		end = (char*)data + sizeUsed;

		while (data < end) {
			BBuffer* buf = fBufferGroupEncVideo->RequestBuffer(rbufsize, 10000);
			if (!buf) {
				TRACE("OutVideo: request buffer timout\n");
				continue;
			}
			
			err = fCard->Extract(buf->Data(), &data, &sizeUsed);
			if (err) {
				buf->Recycle();
				printf("OutVideo Extract error %s\n", strerror(err));
				continue;
			}
	
			media_header* hdr = buf->Header();
			hdr->type = B_MEDIA_ENCODED_VIDEO;
			hdr->size_used = sizeUsed;
			hdr->time_source = TimeSource()->ID();	// set time source id
			//what should the start_time be?
			hdr->start_time = TimeSource()->PerformanceTimeFor(system_time());

			fLock.Lock();
			if (SendBuffer(buf, fOutputEncVideo.source,
					fOutputEncVideo.destination) != B_OK) {
				TRACE("OutVideo: sending buffer failed\n");
				buf->Recycle();
			} 
			fLock.Unlock();
		}
		
	}
}

// how should we handle late buffers?  drop them?
// notify the producer?
status_t ESDSinkNode::HandleBuffer(
				const media_timed_event *event,
				bigtime_t lateness,
				bool realTimeEvent)
{
	CALLED();
	BBuffer * buffer = const_cast<BBuffer*>((BBuffer*)event->pointer);
	if (buffer == 0) {
		fprintf(stderr,"<- B_BAD_VALUE\n");
		return B_BAD_VALUE;
	}
	
	if(fInput.destination.id != buffer->Header()->destination) {
		fprintf(stderr,"<- B_MEDIA_BAD_DESTINATION\n");
		return B_MEDIA_BAD_DESTINATION;
	}
	
	media_header* hdr = buffer->Header();
	bigtime_t now = TimeSource()->Now();
	bigtime_t perf_time = hdr->start_time;
	
	// the how_early calculate here doesn't include scheduling latency because
	// we've already been scheduled to handle the buffer
	bigtime_t how_early = perf_time - EventLatency() - now;
	
	// if the buffer is late, we ignore it and report the fact to the producer
	// who sent it to us
	if ((RunMode() != B_OFFLINE) &&				// lateness doesn't matter in offline mode...
		(RunMode() != B_RECORDING) &&		// ...or in recording mode
		(how_early < 0LL))
	{
		//mLateBuffers++;
		NotifyLateProducer(fInput.source, -how_early, perf_time);
		fprintf(stderr,"	<- LATE BUFFER : %lli\n", how_early);
		buffer->Recycle();
	} else {
		if (fDevice->CanSend())
			fDevice->Write(buffer->Data(), buffer->SizeUsed());
	}
	return B_OK;
}

status_t
ClientNode::_InitOutputPorts()
{
    //printf("JackClient::_InitOutputPorts()\n");
    JackPortList* outputPorts = fOwner->GetOutputPorts();

    for (int i = 0; i < outputPorts->CountItems(); i++) {
        JackPort* port = outputPorts->ItemAt(i);
        if (!port->IsConnected())
            return B_ERROR;

        BBuffer* buffer = fBufferGroup->RequestBuffer(
                              fFormat.u.raw_audio.buffer_size);

        if (buffer == NULL || buffer->Data() == NULL) {
            printf("RequestBuffer failed\n");
            return B_ERROR;
        }

        port->SetProcessingBuffer(buffer);
    }
    return B_OK;
}

//.........这里部分代码省略.........
						fManager->Unlock();
					}
					// next frame
					fFrame++;
				// Send buffers only, if playing, the node is running and the
				// output has been enabled
				} else if (playingDirection != 0 || forceSendingBuffer) {
ldebug("VideoProducer: produce frame\n");
					BAutolock _(fLock);
					// Fetch a buffer from the buffer group
					BBuffer *buffer = fUsedBufferGroup->RequestBuffer(
						fConnectedFormat.display.bytes_per_row
						* fConnectedFormat.display.line_count, 0LL);
					if (buffer) {
						// Fill out the details about this buffer.
						media_header *h = buffer->Header();
						h->type = B_MEDIA_RAW_VIDEO;
						h->time_source = TimeSource()->ID();
						h->size_used = fConnectedFormat.display.bytes_per_row
									   * fConnectedFormat.display.line_count;
						// For a buffer originating from a device, you might
						// want to calculate this based on the
						// PerformanceTimeFor the time your buffer arrived at
						// the hardware (plus any applicable adjustments).
						h->start_time = fPerformanceTimeBase + performanceTime;
						h->file_pos = 0;
						h->orig_size = 0;
						h->data_offset = 0;
						h->u.raw_video.field_gamma = 1.0;
						h->u.raw_video.field_sequence = fFrame;
						h->u.raw_video.field_number = 0;
						h->u.raw_video.pulldown_number = 0;
						h->u.raw_video.first_active_line = 1;
						h->u.raw_video.line_count
							= fConnectedFormat.display.line_count;
						// Fill in a frame
						media_format mf;
						mf.type = B_MEDIA_RAW_VIDEO;
						mf.u.raw_video = fConnectedFormat;
ldebug("VideoProducer: frame: %Ld, playlistFrame: %Ld\n", fFrame, playlistFrame);
						bool forceOrWasCached = forceSendingBuffer;
	
//						if (fManager->LockWithTimeout(5000) == B_OK) {
							// we need to lock the manager, or our
							// fSupplier might work on bad data
							err = fSupplier->FillBuffer(playlistFrame,
														buffer->Data(), &mf,
														forceOrWasCached);
//							fManager->Unlock();
//						} else {
//							err = B_ERROR;
//						}
						// clean the buffer if something went wrong
						if (err != B_OK) {
							memset(buffer->Data(), 0, h->size_used);
							err = B_OK;
						}
						// Send the buffer on down to the consumer
						if (!forceOrWasCached) {
							if (SendBuffer(buffer, fOutput.source,
									fOutput.destination) != B_OK) {
								printf("_FrameGenerator: Error sending buffer\n");
								// If there is a problem sending the buffer,
								// or if we don't send the buffer because its
								// contents are the same as the last one,
								// return it to its buffer group.
								buffer->Recycle();
								// we tell the supplier to delete
								// its caches if there was a problem sending
								// the buffer
								fSupplier->DeleteCaches();
							}
						} else
							buffer->Recycle();
						// Only if everything went fine we clear the flag
						// that forces us to send a buffer even if not
						// playing.
						if (err == B_OK) {
							forceSendingBuffer = false;
							lastFrameSentAt = performanceTime;
						}
					}
else ldebug("no buffer!\n");
					// next frame
					fFrame++;
				} else {
ldebug("VideoProducer: not playing\n");
					// next frame
					fFrame++;
				}
				break;
			default:
ldebug("Couldn't acquire semaphore. Error: %s\n", strerror(err));
				running = false;
				break;
		}
	}
ldebug("VideoProducer: frame generator thread done.\n");
	return B_OK;
}

void
TVideoPreviewView::DisplayThread()
{
	FUNCTION("TVideoPreviewView::DisplayThread\n");

	bigtime_t timeout = 5000;
	bigtime_t realTimeNow = 0;
	bigtime_t perfTimeNow = 0;
	bigtime_t halfPeriod = (bigtime_t) (500000./29.97);
	bool timeSourceRunning = false;

	while (!mDisplayQuit) {
		if (acquire_sem(mServiceLock) == B_NO_ERROR) {
			timeSourceRunning = TimeSource()->IsRunning();
			realTimeNow = BTimeSource::RealTime();
			perfTimeNow = TimeSource()->Now();
			release_sem(mServiceLock);
		}

		snooze(timeout);

		if (timeSourceRunning) {

			// if we received a Stop, deal with it
			if (mStopping) {
				PROGRESS("VidConsumer::DisplayThread - STOP\n");
				if (perfTimeNow >= mStopTime) {
					mRunning = false;
					mStopping = false;

					// deal with any pending Seek
					if (mSeeking)
						mSeeking = false;

					//if (mConnected)
					//	SendDataStatus(B_DATA_NOT_AVAILABLE, mConnections[0], mStopTime);

					continue;
				}
			}

			// if we received a Seek, deal with it
			if (mSeeking) {
				PROGRESS("VidConsumer::DisplayThread - SEEK\n");
				if (perfTimeNow >= mSeekTime) {
					PROGRESS("VidConsumer::DisplayThread - DO SEEK\n");
					mSeeking = false;
					mDeltaTime = mMediaTime;

					continue;
				}
			}

			// if we received a Start, deal with it
			if (mStarting) {
				PROGRESS("BBt848Controllable::CaptureRun mStartTime = %.4f TimeNow = %.4f\n", (double)mStartTime/M1, (double)perfTimeNow/M1);
				if (perfTimeNow >= mStartTime) {
					mRunning = true;
					mStarting = false;
					mDeltaTime = mStartTime;

					//if (mConnected)
					//	SendDataStatus(B_DATA_AVAILABLE, mConnections[0], mStartTime);

					continue;
				}
			}

			if (mRunning) {
				// check for buffer available.
				status_t err = acquire_sem_etc(mBufferAvailable, 1, B_TIMEOUT, halfPeriod * 2);

				if (err == B_TIMED_OUT || !mConnected) {
					ERROR("VidConsumer::DisplayThread - Error from acquire_sem_etc: 0x%lx\n", err);
					continue;
				}

				BBuffer* buffer = mBufferQueue->PopFirstBuffer(0);

				LOOP("Popped buffer %08x, Start time: %.4f, system time: %.4f diff: %.4f\n",
				     buffer,
				     (double) buffer->Header()->start_time/M1,
				     (double) perfTimeNow/M1,
				     (double) (buffer->Header()->start_time - perfTimeNow)/M1);

				// Display frame if we're in B_OFFLINE mode or
				// within +/- a half frame time of start time
				if ( (mRunMode == B_OFFLINE) ||
				     ((perfTimeNow > (buffer->Header()->start_time - halfPeriod)) &&
				      (perfTimeNow < (buffer->Header()->start_time + halfPeriod))) ) {
					uint32 bpp = (mColorspace == B_RGB32 ? 4 : 2);
					memcpy(m_Bitmap->Bits(), buffer->Data(), mRowBytes * mYSize * bpp);
					buffer->Header()->start_time = system_time();
					buffer->Recycle();
					bigtime_t t1 = system_time();

					//	Update view
					if (LockLooper()) {
						DrawBitmap(m_Bitmap, Bounds());
						UnlockLooper();
//.........这里部分代码省略.........

BBuffer*
AudioProducer::_FillNextBuffer(bigtime_t eventTime)
{
	BBuffer* buffer = fBufferGroup->RequestBuffer(
		fOutput.format.u.raw_audio.buffer_size, BufferDuration());

	if (!buffer) {
		ERROR("AudioProducer::_FillNextBuffer() - no buffer\n");
		return NULL;
	}

	size_t sampleSize = fOutput.format.u.raw_audio.format
		& media_raw_audio_format::B_AUDIO_SIZE_MASK;
	size_t numSamples = fOutput.format.u.raw_audio.buffer_size / sampleSize;
		// number of sample in the buffer

	// fill in the buffer header
	media_header* header = buffer->Header();
	header->type = B_MEDIA_RAW_AUDIO;
	header->time_source = TimeSource()->ID();
	buffer->SetSizeUsed(fOutput.format.u.raw_audio.buffer_size);

	bigtime_t performanceTime = bigtime_t(double(fFramesSent)
		* 1000000.0 / double(fOutput.format.u.raw_audio.frame_rate));

	// fill in data from audio supplier
	int64 frameCount = numSamples / fOutput.format.u.raw_audio.channel_count;
	bigtime_t startTime = performanceTime;
	bigtime_t endTime = bigtime_t(double(fFramesSent + frameCount)
		* 1000000.0 / fOutput.format.u.raw_audio.frame_rate);

	if (!fSupplier || fSupplier->InitCheck() != B_OK
		|| fSupplier->GetFrames(buffer->Data(), frameCount, startTime,
			endTime) != B_OK) {
		ERROR("AudioProducer::_FillNextBuffer() - supplier error -> silence\n");
		memset(buffer->Data(), 0, buffer->SizeUsed());
	}

	// stamp buffer
	if (RunMode() == B_RECORDING) {
		header->start_time = eventTime;
	} else {
		header->start_time = fStartTime + performanceTime;
	}

#if DEBUG_TO_FILE
	BMediaTrack* track;
	if (BMediaFile* file = init_media_file(fOutput.format, &track)) {
		track->WriteFrames(buffer->Data(), frameCount);
	}
#endif // DEBUG_TO_FILE

	if (fPeakListener
		&& fOutput.format.u.raw_audio.format
			== media_raw_audio_format::B_AUDIO_FLOAT) {
		// TODO: extend the peak notifier for other sample formats
		int32 channels = fOutput.format.u.raw_audio.channel_count;
		float max[channels];
		float min[channels];
		for (int32 i = 0; i < channels; i++) {
			max[i] = -1.0;
			min[i] = 1.0;
		}
		float* sample = (float*)buffer->Data();
		for (uint32 i = 0; i < frameCount; i++) {
			for (int32 k = 0; k < channels; k++) {
				if (*sample < min[k])
					min[k] = *sample;
				if (*sample > max[k])
					max[k] = *sample;
				sample++;
			}
		}
		BMessage message(MSG_PEAK_NOTIFICATION);
		for (int32 i = 0; i < channels; i++) {
			float maxAbs = max_c(fabs(min[i]), fabs(max[i]));
			message.AddFloat("max", maxAbs);
		}
		bigtime_t realTime = TimeSource()->RealTimeFor(
			fStartTime + performanceTime, 0);
		MessageEvent* event = new (std::nothrow) MessageEvent(realTime,
			fPeakListener, message);
		if (event != NULL)
			EventQueue::Default().AddEvent(event);
	}

	return buffer;
}

BBuffer*
ToneProducer::FillNextBuffer(bigtime_t event_time)
{
	// get a buffer from our buffer group
	BBuffer* buf = mBufferGroup->RequestBuffer(mOutput.format.u.raw_audio.buffer_size, BufferDuration());

	// if we fail to get a buffer (for example, if the request times out), we skip this
	// buffer and go on to the next, to avoid locking up the control thread
	if (!buf)
	{
		return NULL;
	}

	// now fill it with data, continuing where the last buffer left off
	// 20sep99: multichannel support

	size_t numFrames =
		mOutput.format.u.raw_audio.buffer_size /
		(sizeof(float)*mOutput.format.u.raw_audio.channel_count);
	bool stereo = (mOutput.format.u.raw_audio.channel_count == 2);
	if(!stereo) {
		ASSERT(mOutput.format.u.raw_audio.channel_count == 1);
	}
//	PRINT(("buffer: %ld, %ld frames, %s\n", mOutput.format.u.raw_audio.buffer_size, numFrames, stereo ? "stereo" : "mono"));

	float* data = (float*) buf->Data();

	switch (mWaveform)
	{
	case SINE_WAVE:
		FillSineBuffer(data, numFrames, stereo);
		break;

	case TRIANGLE_WAVE:
		FillTriangleBuffer(data, numFrames, stereo);
		break;

	case SAWTOOTH_WAVE:
		FillSawtoothBuffer(data, numFrames, stereo);
		break;
	}

	// fill in the buffer header
	media_header* hdr = buf->Header();
	hdr->type = B_MEDIA_RAW_AUDIO;
	hdr->size_used = mOutput.format.u.raw_audio.buffer_size;
	hdr->time_source = TimeSource()->ID();

	bigtime_t stamp;
	if (RunMode() == B_RECORDING)
	{
		// In B_RECORDING mode, we stamp with the capture time.  We're not
		// really a hardware capture node, but we simulate it by using the (precalculated)
		// time at which this buffer "should" have been created.
		stamp = event_time;
	}
	else
	{
		// okay, we're in one of the "live" performance run modes.  in these modes, we
		// stamp the buffer with the time at which the buffer should be rendered to the
		// output, not with the capture time.  mStartTime is the cached value of the
		// first buffer's performance time; we calculate this buffer's performance time as
		// an offset from that time, based on the amount of media we've created so far.
		// Recalculating every buffer like this avoids accumulation of error.
		stamp = mStartTime + bigtime_t(double(mFramesSent) / double(mOutput.format.u.raw_audio.frame_rate) * 1000000.0);
	}
	hdr->start_time = stamp;

	return buf;
}

//.........这里部分代码省略.........
					fFrame++;
				} else if (playingDirection != 0 || forceSendingBuffer) {
					// Send buffers only, if playing, the node is running and
					// the output has been enabled
					TRACE("_FrameGeneratorThread: produce frame\n");
					BAutolock _(fLock);
					// Fetch a buffer from the buffer group
					fUsedBufferGroup->WaitForBuffers();
					BBuffer* buffer = fUsedBufferGroup->RequestBuffer(
						fConnectedFormat.display.bytes_per_row
						* fConnectedFormat.display.line_count, 0LL);
					if (buffer == NULL) {
						// Wait until a buffer becomes available again
						ERROR("_FrameGeneratorThread: no buffer!\n");
						break;
					}
					// Fill out the details about this buffer.
					media_header* h = buffer->Header();
					h->type = B_MEDIA_RAW_VIDEO;
					h->time_source = TimeSource()->ID();
					h->size_used = fConnectedFormat.display.bytes_per_row
						* fConnectedFormat.display.line_count;
					// For a buffer originating from a device, you might
					// want to calculate this based on the
					// PerformanceTimeFor the time your buffer arrived at
					// the hardware (plus any applicable adjustments).
					h->start_time = fPerformanceTimeBase + performanceTime;
					h->file_pos = 0;
					h->orig_size = 0;
					h->data_offset = 0;
					h->u.raw_video.field_gamma = 1.0;
					h->u.raw_video.field_sequence = fFrame;
					h->u.raw_video.field_number = 0;
					h->u.raw_video.pulldown_number = 0;
					h->u.raw_video.first_active_line = 1;
					h->u.raw_video.line_count
						= fConnectedFormat.display.line_count;
					// Fill in a frame
					TRACE("_FrameGeneratorThread: frame: %Ld, "
						"playlistFrame: %Ld\n", fFrame, playlistFrame);
					bool wasCached = false;
					err = fSupplier->FillBuffer(playlistFrame,
						buffer->Data(), fConnectedFormat, forceSendingBuffer,
						wasCached);
					if (err == B_TIMED_OUT) {
						// Don't send the buffer if there was insufficient
						// time for rendering, this will leave the last
						// valid frame on screen until we catch up, instead
						// of going black.
						wasCached = true;
						err = B_OK;
					}
					// clean the buffer if something went wrong
					if (err != B_OK) {
						// TODO: should use "back value" according
						// to color space!
						memset(buffer->Data(), 0, h->size_used);
						err = B_OK;
					}
					// Send the buffer on down to the consumer
					if (wasCached || (err = SendBuffer(buffer, fOutput.source,
							fOutput.destination) != B_OK)) {
						// If there is a problem sending the buffer,
						// or if we don't send the buffer because its
						// contents are the same as the last one,
						// return it to its buffer group.
						buffer->Recycle();
						// we tell the supplier to delete
						// its caches if there was a problem sending
						// the buffer
						if (err != B_OK) {
							ERROR("_FrameGeneratorThread: Error "
								"sending buffer\n");
							fSupplier->DeleteCaches();
						}
					}
					// Only if everything went fine we clear the flag
					// that forces us to send a buffer even if not
					// playing.
					if (err == B_OK)
						forceSendingBuffer = false;
					// next frame
					fFrame++;
					droppedFrames = 0;
				} else {
					TRACE("_FrameGeneratorThread: not playing\n");
					// next frame
					fFrame++;
				}
				break;
			default:
				TRACE("_FrameGeneratorThread: Couldn't acquire semaphore. "
					"Error: %s\n", strerror(err));
				running = false;
				break;
		}
	}
	TRACE("_FrameGeneratorThread: frame generator thread done.\n");
	return B_OK;
}

int main()
{
	// app_server connection (no need to run it)
	BApplication app("application/x-vnd-test"); 
	
	BBufferGroup * group;
	status_t s;
	int32 count;
	BBuffer *buffer;

/*
	printf("using default constructor:\n");
	group = new BBufferGroup();


	s = group->InitCheck();
	printf("InitCheck: status = %ld\n",s);
	
	s = group->CountBuffers(&count);
	printf("CountBuffers: count = %ld, status = %ld\n",count,s);
	
	delete group;
*/
	printf("\n");
	printf("using size = 1234 constructor:\n");
	group = new BBufferGroup(1234);

	s = group->InitCheck();
	printf("InitCheck: status = %ld\n",s);
	
	s = group->CountBuffers(&count);
	printf("CountBuffers: count = %ld, status = %ld\n",count,s);

	s = group->GetBufferList(1,&buffer);
	printf("GetBufferList: status = %ld\n",s);

	printf("Buffer->Data:  = %08x\n",(int)buffer->Data());

	printf("Buffer->ID:  = %d\n",(int)buffer->ID());

	printf("Buffer->Size:  = %ld\n",buffer->Size());

	printf("Buffer->SizeAvailable:  = %ld\n",buffer->SizeAvailable());

	printf("Buffer->SizeUsed:  = %ld\n",buffer->SizeUsed());

	printf("\n");

	media_buffer_id id = buffer->ID();
	BBufferGroup * group2 = new BBufferGroup(1,&id);
	printf("creating second group with a buffer from first group:\n");

	s = group2->InitCheck();
	printf("InitCheck: status = %ld\n",s);

	s = group2->CountBuffers(&count);
	printf("CountBuffers: count = %ld, status = %ld\n",count,s);

	buffer = 0;
	s = group2->GetBufferList(1,&buffer);
	printf("GetBufferList: status = %ld\n",s);

	printf("Buffer->Data:  = %08x\n",(int)buffer->Data());

	printf("Buffer->ID:  = %d\n",(int)buffer->ID());

	printf("Buffer->Size:  = %ld\n",buffer->Size());

	printf("Buffer->SizeAvailable:  = %ld\n",buffer->SizeAvailable());

	printf("Buffer->SizeUsed:  = %ld\n",buffer->SizeUsed());

	delete group;
	delete group2;

	printf("\n");
/*
	printf("creating a BSmallBuffer:\n");
	BSmallBuffer * sb = new BSmallBuffer;

	printf("sb->Data:  = %08x\n",(int)sb->Data());

	printf("sb->ID:  = %d\n",(int)sb->ID());

	printf("sb->Size:  = %ld\n",sb->Size());

	printf("sb->SizeAvailable:  = %ld\n",sb->SizeAvailable());

	printf("sb->SizeUsed:  = %ld\n",sb->SizeUsed());

	printf("sb->SmallBufferSizeLimit:  = %ld\n",sb->SmallBufferSizeLimit());

	delete sb;
*/
	return 0;
}

void
MixerCore::_MixThread()
{
	// The broken BeOS R5 multiaudio node starts with time 0,
	// then publishes negative times for about 50ms, publishes 0
	// again until it finally reaches time values > 0
	if (!LockFromMixThread())
		return;
	bigtime_t start = fTimeSource->Now();
	Unlock();
	while (start <= 0) {
		TRACE("MixerCore: delaying _MixThread start, timesource is at %Ld\n",
			start);
		snooze(5000);
		if (!LockFromMixThread())
			return;
		start = fTimeSource->Now();
		Unlock();
	}

	if (!LockFromMixThread())
		return;
	bigtime_t latency = max((bigtime_t)3600, bigtime_t(0.4 * buffer_duration(
		fOutput->MediaOutput().format.u.raw_audio)));

	// TODO: when the format changes while running, everything is wrong!
	bigtime_t bufferRequestTimeout = buffer_duration(
		fOutput->MediaOutput().format.u.raw_audio) / 2;

	TRACE("MixerCore: starting _MixThread at %Ld with latency %Ld and "
		"downstream latency %Ld, bufferRequestTimeout %Ld\n", start, latency,
		fDownstreamLatency, bufferRequestTimeout);

	// We must read from the input buffer at a position (pos) that is always
	// a multiple of fMixBufferFrameCount.
	int64 temp = frames_for_duration(fMixBufferFrameRate, start);
	int64 frameBase = ((temp / fMixBufferFrameCount) + 1)
		* fMixBufferFrameCount;
	bigtime_t timeBase = duration_for_frames(fMixBufferFrameRate, frameBase);
	Unlock();

	TRACE("MixerCore: starting _MixThread, start %Ld, timeBase %Ld, "
		"frameBase %Ld\n", start, timeBase, frameBase);

	ASSERT(fMixBufferFrameCount > 0);

#if DEBUG
	uint64 bufferIndex = 0;
#endif

	typedef RtList<chan_info> chan_info_list;
	chan_info_list inputChanInfos[MAX_CHANNEL_TYPES];
	BStackOrHeapArray<chan_info_list, 16> mixChanInfos(fMixBufferChannelCount);
		// TODO: this does not support changing output channel count

	bigtime_t eventTime = timeBase;
	int64 framePos = 0;
	for (;;) {
		if (!LockFromMixThread())
			return;
		bigtime_t waitUntil = fTimeSource->RealTimeFor(eventTime, 0)
			- latency - fDownstreamLatency;
		Unlock();
		status_t rv = acquire_sem_etc(fMixThreadWaitSem, 1, B_ABSOLUTE_TIMEOUT,
			waitUntil);
		if (rv == B_INTERRUPTED)
			continue;
		if (rv != B_TIMED_OUT && rv < B_OK)
			return;

		if (!LockWithTimeout(10000)) {
			ERROR("MixerCore: LockWithTimeout failed\n");
			continue;
		}

		// no inputs or output muted, skip further processing and just send an
		// empty buffer
		if (fInputs->IsEmpty() || fOutput->IsMuted()) {
			int size = fOutput->MediaOutput().format.u.raw_audio.buffer_size;
			BBuffer* buffer = fBufferGroup->RequestBuffer(size,
				bufferRequestTimeout);
			if (buffer != NULL) {
				memset(buffer->Data(), 0, size);
				// fill in the buffer header
				media_header* hdr = buffer->Header();
				hdr->type = B_MEDIA_RAW_AUDIO;
				hdr->size_used = size;
				hdr->time_source = fTimeSource->ID();
				hdr->start_time = eventTime;
				if (fNode->SendBuffer(buffer, fOutput) != B_OK) {
#if DEBUG
					ERROR("MixerCore: SendBuffer failed for buffer %Ld\n",
						bufferIndex);
#else
					ERROR("MixerCore: SendBuffer failed\n");
#endif
					buffer->Recycle();
				}
			} else {
#if DEBUG
//.........这里部分代码省略.........

/* The following functions form the thread that generates frames. You should
 * replace this with the code that interfaces to your hardware. */
int32
VideoProducer::FrameGenerator()
{
	bigtime_t wait_until = system_time();

	while (1) {
		PRINTF(1, ("FrameGenerator: acquire_sem_etc() until %Ldµs (in %Ldµs)\n", wait_until, wait_until - system_time()));
		status_t err = acquire_sem_etc(fFrameSync, 1, B_ABSOLUTE_TIMEOUT,
				wait_until);

		/* The only acceptable responses are B_OK and B_TIMED_OUT. Everything
		 * else means the thread should quit. Deleting the semaphore, as in
		 * VideoProducer::HandleStop(), will trigger this behavior. */
		if ((err != B_OK) && (err != B_TIMED_OUT))
			break;

		fFrame++;

		/* Recalculate the time until the thread should wake up to begin
		 * processing the next frame. Subtract fProcessingLatency so that
		 * the frame is sent in time. */
		wait_until = TimeSource()->RealTimeFor(fPerformanceTimeBase, 0) +
				(bigtime_t)
						((fFrame - fFrameBase) *
						(1000000 / fConnectedFormat.field_rate)) -
				fProcessingLatency;
PRINT(("PS: %Ld\n", fProcessingLatency));

		/* Drop frame if it's at least a frame late */
		if (wait_until < system_time())
			continue;

		PRINTF(1, ("FrameGenerator: wait until %Ld, %ctimed out, %crunning, %cenabled.\n",
					wait_until,
					(err == B_OK)?'!':' ',
					(fRunning)?' ':'!',
					(fEnabled)?' ':'!'));

		/* If the semaphore was acquired successfully, it means something
		 * changed the timing information (see VideoProducer::Connect()) and
		 * so the thread should go back to sleep until the newly-calculated
		 * wait_until time. */
		if (err == B_OK)
			continue;

		/* Send buffers only if the node is running and the output has been
		 * enabled */
		if (!fRunning || !fEnabled)
			continue;

		BAutolock _(fLock);

		/* Fetch a buffer from the buffer group */
		BBuffer *buffer = fBufferGroup->RequestBuffer(
						4 * fConnectedFormat.display.line_width *
						fConnectedFormat.display.line_count, 0LL);
		if (!buffer)
			continue;

		/* Fill out the details about this buffer. */
		media_header *h = buffer->Header();
		h->type = B_MEDIA_RAW_VIDEO;
		h->time_source = TimeSource()->ID();
		h->size_used = 4 * fConnectedFormat.display.line_width *
						fConnectedFormat.display.line_count;
		/* For a buffer originating from a device, you might want to calculate
		 * this based on the PerformanceTimeFor the time your buffer arrived at
		 * the hardware (plus any applicable adjustments). */
		/*
		h->start_time = fPerformanceTimeBase +
						(bigtime_t)
							((fFrame - fFrameBase) *
							(1000000 / fConnectedFormat.field_rate));
		*/
		h->file_pos = 0;
		h->orig_size = 0;
		h->data_offset = 0;
		h->u.raw_video.field_gamma = 1.0;
		h->u.raw_video.field_sequence = fFrame;
		h->u.raw_video.field_number = 0;
		h->u.raw_video.pulldown_number = 0;
		h->u.raw_video.first_active_line = 1;
		h->u.raw_video.line_count = fConnectedFormat.display.line_count;

		// This is where we fill the video buffer.

#if 0
		uint32 *p = (uint32 *)buffer->Data();
		/* Fill in a pattern */
		for (uint32 y=0;y<fConnectedFormat.display.line_count;y++)
			for (uint32 x=0;x<fConnectedFormat.display.line_width;x++)
				*(p++) = ((((x+y)^0^x)+fFrame) & 0xff) * (0x01010101 & fColor);
#endif

		//NO! must be called without lock!
		//BAutolock lock(fCamDevice->Locker());

		bigtime_t now = system_time();
//.........这里部分代码省略.........

/* The following functions form the thread that generates frames. You should
 * replace this with the code that interfaces to your hardware. */
int32 
FinePixProducer::FrameGenerator()
{
	bigtime_t wait_until = system_time();

	while (1) {
		status_t err = acquire_sem_etc(fFrameSync, 1, B_ABSOLUTE_TIMEOUT,
				wait_until);

		/* The only acceptable responses are B_OK and B_TIMED_OUT. Everything
		 * else means the thread should quit. Deleting the semaphore, as in
		 * FinePixProducer::HandleStop(), will trigger this behavior. */
		if ((err != B_OK) && (err != B_TIMED_OUT))
			break;

		fFrame++;

		/* Recalculate the time until the thread should wake up to begin
		 * processing the next frame. Subtract fProcessingLatency so that
		 * the frame is sent in time. */
		wait_until = TimeSource()->RealTimeFor(fPerformanceTimeBase, 0) +
				(bigtime_t)
						((fFrame - fFrameBase) *
						(1000000 / fConnectedFormat.field_rate)) -
				fProcessingLatency;

		/* Drop frame if it's at least a frame late */
		if (wait_until < system_time())
			continue;

		/* If the semaphore was acquired successfully, it means something
		 * changed the timing information (see FinePixProducer::Connect()) and
		 * so the thread should go back to sleep until the newly-calculated
		 * wait_until time. */
		if (err == B_OK)
			continue;

		/* Send buffers only if the node is running and the output has been
		 * enabled */
		if (!fRunning || !fEnabled)
			continue;

		BAutolock _(fLock);

		// Get the frame from the camera
		fCam->GetPic(fDeltaBuffer, frame_size);
		
		/* Fetch a buffer from the buffer group */
		BBuffer *buffer = fBufferGroup->RequestBuffer(
						4 * fConnectedFormat.display.line_width *
						fConnectedFormat.display.line_count, 0LL);
		if (!buffer)
			continue;

		/* Fill out the details about this buffer. */
		media_header *h = buffer->Header();
		h->type = B_MEDIA_RAW_VIDEO;
		h->time_source = TimeSource()->ID();
		h->size_used = 4 * fConnectedFormat.display.line_width *
						fConnectedFormat.display.line_count;
		/* For a buffer originating from a device, you might want to calculate
		 * this based on the PerformanceTimeFor the time your buffer arrived at
		 * the hardware (plus any applicable adjustments). 
		h->start_time = fPerformanceTimeBase +
						(bigtime_t)
							((fFrame - fFrameBase) *
							(1000000 / fConnectedFormat.field_rate));*/
		h->start_time = TimeSource()->Now();
		h->file_pos = 0;
		h->orig_size = 0;
		h->data_offset = 0;
		h->u.raw_video.field_gamma = 1.0;
		h->u.raw_video.field_sequence = fFrame;
		h->u.raw_video.field_number = 0;
		h->u.raw_video.pulldown_number = 0;
		h->u.raw_video.first_active_line = 1;
		h->u.raw_video.line_count = fConnectedFormat.display.line_count;

		// Frame data pointers
		uint8 *tmp24 = (uint8*)tempInBuffer;
		uint8 *dst = (uint8*)buffer->Data();

		// Convert from jpeg to bitmap
		if (jpeg_check_size(fDeltaBuffer,
			    FPIX_RGB24_WIDTH, FPIX_RGB24_HEIGHT)) 
		{
			int n = jpeg_decode(fDeltaBuffer, tmp24,
				FPIX_RGB24_WIDTH, FPIX_RGB24_HEIGHT, 24, //32 not working
				&decdata);
			if (n) 
			{
				PRINTF(-1, ("ooeps decode jpg result : %d", n));
			}
		} else 
		{
			PRINTF(-1, ("ooeps check_size failed"));
		} 
		
//.........这里部分代码省略.........