comparison src/portaudio_20161030_catalina_patch/bindings/cpp/example/sine.cxx @ 77:4edcd14160a5 pa_catalina

Duplicate for patch testing

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