paex_sine_c++.cpp
/*
* $Id: paex_sine.c 1752 2011-09-08 03:21:55Z philburk $
*
* This program uses the PortAudio Portable Audio Library.
* For more information see: http://www.portaudio.com/
* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* The text above constitutes the entire PortAudio license; however,
* the PortAudio community also makes the following non-binding requests:
*
* Any person wishing to distribute modifications to the Software is
* requested to send the modifications to the original developer so that
* they can be incorporated into the canonical version. It is also
* requested that these non-binding requests be included along with the
* license above.
*/
#include <stdio.h>
#include <math.h>
#include "portaudio.h"
#define NUM_SECONDS (5)
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (64)
#ifndef M_PI
#define M_PI (3.14159265)
#endif
#define TABLE_SIZE (200)
class Sine
{
public:
Sine() : stream(0), left_phase(0), right_phase(0)
{
/* initialise sinusoidal wavetable */
for( int i=0; i<TABLE_SIZE; i++ )
{
sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
}
sprintf( message, "No Message" );
}
bool open(PaDeviceIndex index)
{
PaStreamParameters outputParameters;
outputParameters.device = index;
if (outputParameters.device == paNoDevice) {
return false;
}
const PaDeviceInfo* pInfo = Pa_GetDeviceInfo(index);
if (pInfo != 0)
{
printf("Output device name: '%s'\r", pInfo->name);
}
outputParameters.channelCount = 2; /* stereo output */
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
outputParameters.hostApiSpecificStreamInfo = NULL;
PaError err = Pa_OpenStream(
&stream,
NULL, /* no input */
&outputParameters,
SAMPLE_RATE,
paFramesPerBufferUnspecified,
paClipOff, /* we won't output out of range samples so don't bother clipping them */
&Sine::paCallback,
this /* Using 'this' for userData so we can cast to Sine* in paCallback method */
);
if (err != paNoError)
{
/* Failed to open stream to device !!! */
return false;
}
err = Pa_SetStreamFinishedCallback( stream, &Sine::paStreamFinished );
if (err != paNoError)
{
Pa_CloseStream( stream );
stream = 0;
return false;
}
return true;
}
bool close()
{
if (stream == 0)
return false;
PaError err = Pa_CloseStream( stream );
stream = 0;
return (err == paNoError);
}
bool start()
{
if (stream == 0)
return false;
PaError err = Pa_StartStream( stream );
return (err == paNoError);
}
bool stop()
{
if (stream == 0)
return false;
PaError err = Pa_StopStream( stream );
return (err == paNoError);
}
private:
/* The instance callback, where we have access to every method/variable in object of class Sine */
int paCallbackMethod(const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags)
{
float *out = (float*)outputBuffer;
unsigned long i;
(void) timeInfo; /* Prevent unused variable warnings. */
(void) statusFlags;
(void) inputBuffer;
for( i=0; i<framesPerBuffer; i++ )
{
*out++ = sine[left_phase]; /* left */
*out++ = sine[right_phase]; /* right */
left_phase += 1;
if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE;
right_phase += 3; /* higher pitch so we can distinguish left and right. */
if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE;
}
return paContinue;
}
/* This routine will be called by the PortAudio engine when audio is needed.
** It may called at interrupt level on some machines so don't do anything
** that could mess up the system like calling malloc() or free().
*/
static int paCallback( const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags,
void *userData )
{
/* Here we cast userData to Sine* type so we can call the instance method paCallbackMethod, we can do that since
we called Pa_OpenStream with 'this' for userData */
return ((Sine*)userData)->paCallbackMethod(inputBuffer, outputBuffer,
framesPerBuffer,
timeInfo,
statusFlags);
}
void paStreamFinishedMethod()
{
printf( "Stream Completed: %s\n", message );
}
/*
* This routine is called by portaudio when playback is done.
*/
static void paStreamFinished(void* userData)
{
return ((Sine*)userData)->paStreamFinishedMethod();
}
PaStream *stream;
float sine[TABLE_SIZE];
int left_phase;
int right_phase;
char message[20];
};
class ScopedPaHandler
{
public:
ScopedPaHandler()
: _result(Pa_Initialize())
{
}
~ScopedPaHandler()
{
if (_result == paNoError)
{
Pa_Terminate();
}
}
PaError result() const { return _result; }
private:
PaError _result;
};
/*******************************************************************/
int main(void);
int main(void)
{
Sine sine;
printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
ScopedPaHandler paInit;
if( paInit.result() != paNoError ) goto error;
if (sine.open(Pa_GetDefaultOutputDevice()))
{
if (sine.start())
{
printf("Play for %d seconds.\n", NUM_SECONDS );
Pa_Sleep( NUM_SECONDS * 1000 );
sine.stop();
}
sine.close();
}
printf("Test finished.\n");
return paNoError;
error:
fprintf( stderr, "An error occured while using the portaudio stream\n" );
fprintf( stderr, "Error number: %d\n", paInit.result() );
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( paInit.result() ) );
return 1;
}
PaStreamParameters::channelCount
int channelCount
Definition: portaudio.h:553
PaStreamParameters::sampleFormat
PaSampleFormat sampleFormat
Definition: portaudio.h:559
Pa_CloseStream
PaError Pa_CloseStream(PaStream *stream)
PaStreamParameters::hostApiSpecificStreamInfo
void * hostApiSpecificStreamInfo
Definition: portaudio.h:579
PaDeviceInfo
Definition: portaudio.h:500
Pa_Sleep
void Pa_Sleep(long msec)
portaudio.h
The portable PortAudio API.
paContinue
@ paContinue
Definition: portaudio.h:755
Pa_GetErrorText
const char * Pa_GetErrorText(PaError errorCode)
paFloat32
#define paFloat32
Definition: portaudio.h:487
Pa_StartStream
PaError Pa_StartStream(PaStream *stream)
Pa_Terminate
PaError Pa_Terminate(void)
Sine
Definition: paex_sine_c++.cpp:58
Pa_Initialize
PaError Pa_Initialize(void)
PaStreamParameters::suggestedLatency
PaTime suggestedLatency
Definition: portaudio.h:572
paFramesPerBufferUnspecified
#define paFramesPerBufferUnspecified
Definition: portaudio.h:642
paClipOff
#define paClipOff
Definition: portaudio.h:661
PaStream
void PaStream
Definition: portaudio.h:635
Pa_OpenStream
PaError Pa_OpenStream(PaStream **stream, const PaStreamParameters *inputParameters, const PaStreamParameters *outputParameters, double sampleRate, unsigned long framesPerBuffer, PaStreamFlags streamFlags, PaStreamCallback *streamCallback, void *userData)
Pa_GetDeviceInfo
const PaDeviceInfo * Pa_GetDeviceInfo(PaDeviceIndex device)
ScopedPaHandler
Definition: paex_sine_c++.cpp:221
paNoDevice
#define paNoDevice
Definition: portaudio.h:220
PaStreamParameters::device
PaDeviceIndex device
Definition: portaudio.h:546
Pa_SetStreamFinishedCallback
PaError Pa_SetStreamFinishedCallback(PaStream *stream, PaStreamFinishedCallback *streamFinishedCallback)
Pa_StopStream
PaError Pa_StopStream(PaStream *stream)
PaError
int PaError
Definition: portaudio.h:121
PaStreamParameters
Definition: portaudio.h:538
PaDeviceIndex
int PaDeviceIndex
Definition: portaudio.h:212
PaStreamCallbackTimeInfo
Definition: portaudio.h:699
PaStreamCallbackFlags
unsigned long PaStreamCallbackFlags
Definition: portaudio.h:712
Pa_GetDefaultOutputDevice
PaDeviceIndex Pa_GetDefaultOutputDevice(void)