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