From eac187fcbafcc518185d1074395c5fbe6a7e5aec Mon Sep 17 00:00:00 2001
From: Roland Stigge <stigge@antcom.de>
Date: Sun, 17 Feb 2019 22:10:33 +0100
Subject: Added portaudio support

---
 audioio.cpp | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 audioio.cpp

(limited to 'audioio.cpp')

diff --git a/audioio.cpp b/audioio.cpp
new file mode 100644
index 0000000..31fa1cd
--- /dev/null
+++ b/audioio.cpp
@@ -0,0 +1,128 @@
+#include "audioio.h"
+
+#include <exception>
+#include <iostream>
+
+#include <portaudiocpp/AutoSystem.hxx>
+#include <portaudiocpp/CallbackInterface.hxx>
+#include <portaudiocpp/Device.hxx>
+#include <portaudiocpp/InterfaceCallbackStream.hxx>
+#include <portaudiocpp/StreamParameters.hxx>
+#include <portaudiocpp/System.hxx>
+#include <portaudiocpp/SystemDeviceIterator.hxx>
+
+namespace {
+
+class Callback: public portaudio::CallbackInterface {
+	public:
+		Callback(int size): mBuffer(size){}
+
+		std::vector<std::complex<double>> mBuffer;
+
+		int paCallbackFun( const void *inputBuffer, void *outputBuffer,
+                           unsigned long framesPerBuffer,
+                           const PaStreamCallbackTimeInfo* timeInfo,
+                           PaStreamCallbackFlags statusFlags ) override
+		{
+			std::cout << "Callback" << std::endl;
+
+			float* buf = (float*)inputBuffer;
+			for (int i = 0; i < framesPerBuffer; i++) {
+				mBuffer[i] = buf[i];
+			}
+			return 0;
+		}
+};
+
+int bufferSizeFromSampleRate(double sampleRate) {
+	int result = 1;
+
+	while (result < sampleRate)
+		result <<= 1;
+
+	result /= 32;
+
+	if (result < 1024)
+		throw std::runtime_error(std::string("Bad buffer size ") + std::to_string(result) + " for sample rate " + std::to_string(sampleRate));
+
+	return result;
+}
+
+void printDeviceList() {
+	portaudio::System& mSystem = portaudio::System::instance();
+
+	std::cout << "Number of Devices: " << mSystem.deviceCount() << std::endl;
+	std::for_each(mSystem.devicesBegin(), mSystem.devicesEnd(),
+		      [](const portaudio::Device& device){ std::cout
+				<< "Device Name: " << device.name()
+				<< " Default Rate: " << device.defaultSampleRate()
+			       	<< std::endl;
+			}
+		      );
+}
+
+} // namespace
+
+struct RIT::AudioIO::Impl {
+	Impl()
+		: mAudioSystem()
+		, mSystem(portaudio::System::instance())
+		, mDevice(mSystem.defaultInputDevice())
+		, mSampleRate(mDevice.defaultSampleRate())
+		, mSize(bufferSizeFromSampleRate(mSampleRate))
+		, mInputParams(mDevice, 1, portaudio::FLOAT32, false, mDevice.defaultLowInputLatency(), nullptr)
+		, mOutputParams(portaudio::System::nullDevice(), 0, portaudio::FLOAT32, false, mDevice.defaultLowInputLatency(), nullptr)
+		, mParameters(mInputParams, mOutputParams, mSampleRate, mSize, paNoFlag)
+		, mCallback(mSize)
+		, mStream(mParameters, mCallback)
+	{
+		printDeviceList();
+		
+		mStream.start();
+
+		if (!mStream.isOpen())
+			throw std::runtime_error("Error: Stream not open");
+		
+		if (!mStream.isActive())
+			throw std::runtime_error("Error: Stream not active");
+
+		std::cout << "Activated Device: " << mDevice.name() << " at " << mSampleRate << " Hz, buffer: " << mSize << " samples, running..." << std::endl;
+	}
+	~Impl() {}
+
+	// Port audio specific
+	portaudio::AutoSystem mAudioSystem; // init / deinit portaudio
+	portaudio::System& mSystem;
+	portaudio::Device& mDevice;
+	double mSampleRate;
+	int mSize;
+	portaudio::DirectionSpecificStreamParameters mInputParams;
+	portaudio::DirectionSpecificStreamParameters mOutputParams;
+	portaudio::StreamParameters mParameters;
+	Callback mCallback;
+	portaudio::InterfaceCallbackStream mStream;
+};
+
+RIT::AudioIO::AudioIO(): mImpl(std::make_unique<AudioIO::Impl>())
+{
+}
+
+RIT::AudioIO::~AudioIO()
+{
+}
+
+std::vector<std::complex<double>> RIT::AudioIO::sample()
+{
+	return mImpl->mCallback.mBuffer; // TODO: thread synchronization! Ringbuffer? PaUtilRingBuffer?
+}
+
+int RIT::AudioIO::size() const
+{
+	return mImpl->mSize;
+}
+
+int RIT::AudioIO::sampleFrequency() const
+{
+	return int(mImpl->mSampleRate);
+}
+
-- 
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