diff options
Diffstat (limited to 'portaudio/bindings/cpp/example/sine.cxx')
| -rw-r--r-- | portaudio/bindings/cpp/example/sine.cxx | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/portaudio/bindings/cpp/example/sine.cxx b/portaudio/bindings/cpp/example/sine.cxx new file mode 100644 index 0000000..577a247 --- /dev/null +++ b/portaudio/bindings/cpp/example/sine.cxx @@ -0,0 +1,137 @@ +// ---------------------------------------------------------------------------------------
+
+#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;
+}
+
+
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