Chris@39: // ---------------------------------------------------------------------------------------
Chris@39: 
Chris@39: #include <iostream>
Chris@39: #include <cmath>
Chris@39: #include <cassert>
Chris@39: #include <cstddef>
Chris@39: #include "portaudiocpp/PortAudioCpp.hxx"
Chris@39: 
Chris@39: // ---------------------------------------------------------------------------------------
Chris@39: 
Chris@39: // Some constants:
Chris@39: const int NUM_SECONDS = 5;
Chris@39: const double SAMPLE_RATE = 44100.0;
Chris@39: const int FRAMES_PER_BUFFER = 64;
Chris@39: const int TABLE_SIZE = 200;
Chris@39: 
Chris@39: // ---------------------------------------------------------------------------------------
Chris@39: 
Chris@39: // SineGenerator class:
Chris@39: class SineGenerator
Chris@39: {
Chris@39: public:
Chris@39: 	SineGenerator(int tableSize) : tableSize_(tableSize), leftPhase_(0), rightPhase_(0)
Chris@39: 	{
Chris@39: 		const double PI = 3.14159265;
Chris@39: 		table_ = new float[tableSize];
Chris@39: 		for (int i = 0; i < tableSize; ++i)
Chris@39: 		{
Chris@39: 			table_[i] = 0.125f * (float)sin(((double)i/(double)tableSize)*PI*2.);
Chris@39: 		}
Chris@39: 	}
Chris@39: 
Chris@39: 	~SineGenerator()
Chris@39: 	{
Chris@39: 		delete[] table_;
Chris@39: 	}
Chris@39: 
Chris@39: 	int generate(const void *inputBuffer, void *outputBuffer, unsigned long framesPerBuffer, 
Chris@39: 		const PaStreamCallbackTimeInfo *timeInfo, PaStreamCallbackFlags statusFlags)
Chris@39: 	{
Chris@39: 		assert(outputBuffer != NULL);
Chris@39: 
Chris@39: 		float **out = static_cast<float **>(outputBuffer);
Chris@39: 
Chris@39: 		for (unsigned int i = 0; i < framesPerBuffer; ++i)
Chris@39: 		{
Chris@39: 			out[0][i] = table_[leftPhase_];
Chris@39: 			out[1][i] = table_[rightPhase_];
Chris@39: 
Chris@39: 			leftPhase_ += 1;
Chris@39: 			if (leftPhase_ >= tableSize_)
Chris@39: 				leftPhase_ -= tableSize_;
Chris@39: 
Chris@39: 			rightPhase_ += 3;
Chris@39: 			if (rightPhase_ >= tableSize_)
Chris@39: 				rightPhase_ -= tableSize_;
Chris@39: 		}
Chris@39: 
Chris@39: 		return paContinue;
Chris@39: 	}
Chris@39: 
Chris@39: private:
Chris@39: 	float *table_;
Chris@39: 	int tableSize_;
Chris@39: 	int leftPhase_;
Chris@39: 	int rightPhase_;
Chris@39: };
Chris@39: 
Chris@39: // ---------------------------------------------------------------------------------------
Chris@39: 
Chris@39: // main:
Chris@39: int main(int, char *[]);
Chris@39: int main(int, char *[])
Chris@39: {
Chris@39: 	try
Chris@39: 	{
Chris@39: 		// Create a SineGenerator object:
Chris@39: 		SineGenerator sineGenerator(TABLE_SIZE);
Chris@39: 
Chris@39: 		std::cout << "Setting up PortAudio..." << std::endl;
Chris@39: 
Chris@39: 		// Set up the System:
Chris@39: 		portaudio::AutoSystem autoSys;
Chris@39: 		portaudio::System &sys = portaudio::System::instance();
Chris@39: 
Chris@39: 		// Set up the parameters required to open a (Callback)Stream:
Chris@39: 		portaudio::DirectionSpecificStreamParameters outParams(sys.defaultOutputDevice(), 2, portaudio::FLOAT32, false, sys.defaultOutputDevice().defaultLowOutputLatency(), NULL);
Chris@39: 		portaudio::StreamParameters params(portaudio::DirectionSpecificStreamParameters::null(), outParams, SAMPLE_RATE, FRAMES_PER_BUFFER, paClipOff);
Chris@39: 
Chris@39: 		std::cout << "Opening stereo output stream..." << std::endl;
Chris@39: 
Chris@39: 		// Create (and open) a new Stream, using the SineGenerator::generate function as a callback:
Chris@39: 		portaudio::MemFunCallbackStream<SineGenerator> stream(params, sineGenerator, &SineGenerator::generate);
Chris@39: 
Chris@39: 		std::cout << "Starting playback for " << NUM_SECONDS << " seconds." << std::endl;
Chris@39: 
Chris@39: 		// Start the Stream (audio playback starts):
Chris@39: 		stream.start();
Chris@39: 
Chris@39: 		// Wait for 5 seconds:
Chris@39: 		sys.sleep(NUM_SECONDS * 1000);
Chris@39: 
Chris@39: 		std::cout << "Closing stream..." <<std::endl;
Chris@39: 
Chris@39: 		// Stop the Stream (not strictly needed as termintating the System will also stop all open Streams):
Chris@39: 		stream.stop();
Chris@39: 
Chris@39: 		// Close the Stream (not strictly needed as terminating the System will also close all open Streams):
Chris@39: 		stream.close();
Chris@39: 
Chris@39: 		// Terminate the System (not strictly needed as the AutoSystem will also take care of this when it 
Chris@39: 		// goes out of scope):
Chris@39: 		sys.terminate();
Chris@39: 
Chris@39: 		std::cout << "Test finished." << std::endl;
Chris@39: 	}
Chris@39: 	catch (const portaudio::PaException &e)
Chris@39: 	{
Chris@39: 		std::cout << "A PortAudio error occured: " << e.paErrorText() << std::endl;
Chris@39: 	}
Chris@39: 	catch (const portaudio::PaCppException &e)
Chris@39: 	{
Chris@39: 		std::cout << "A PortAudioCpp error occured: " << e.what() << std::endl;
Chris@39: 	}
Chris@39: 	catch (const std::exception &e)
Chris@39: 	{
Chris@39: 		std::cout << "A generic exception occured: " << e.what() << std::endl;
Chris@39: 	}
Chris@39: 	catch (...)
Chris@39: 	{
Chris@39: 		std::cout << "An unknown exception occured." << std::endl;
Chris@39: 	}
Chris@39: 
Chris@39: 	return 0;
Chris@39: }
Chris@39: 
Chris@39: