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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@249 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
195 lines
7.0 KiB
C
195 lines
7.0 KiB
C
/** @file patest_multi_sine.c
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@brief Play a different sine wave on each channel.
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@author Phil Burk http://www.softsynth.com
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*/
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/*
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* $Id$
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*
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* This program uses the PortAudio Portable Audio Library.
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* For more information see: http://www.portaudio.com
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* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <stdio.h>
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#include <math.h>
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#include "portaudio.h"
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (256)
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#define FREQ_INCR (300.0 / SAMPLE_RATE)
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#define MAX_CHANNELS (64)
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#ifndef M_PI
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#define M_PI (3.14159265)
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#endif
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typedef struct
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{
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short interleaved; /* Nonzero for interleaved / zero for non-interleaved. */
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int numChannels; /* Actually used. */
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double phases[MAX_CHANNELS]; /* Each channel gets its' own frequency. */
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}
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paTestData;
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/* This routine will be called by the PortAudio engine when audio is needed.
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** It may called at interrupt level on some machines so don't do anything
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** that could mess up the system like calling malloc() or free().
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*/
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static int patestCallback(const void* inputBuffer,
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void* outputBuffer,
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unsigned long framesPerBuffer,
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const PaStreamCallbackTimeInfo* timeInfo,
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PaStreamCallbackFlags statusFlags,
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void* userData)
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{
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int frameIndex, channelIndex;
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float** outputs = (float**)outputBuffer;
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paTestData* data = (paTestData*)userData;
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(void) inputBuffer; /* Prevent unused arg warning. */
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if (data->interleaved)
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{
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float *out = (float*)outputBuffer; /* interleaved version */
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for( frameIndex=0; frameIndex<(int)framesPerBuffer; frameIndex++ )
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{
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for( channelIndex=0; channelIndex<data->numChannels; channelIndex++ )
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{
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/* Output sine wave on every channel. */
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*out++ = (float) sin(data->phases[channelIndex]);
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/* Play each channel at a higher frequency. */
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data->phases[channelIndex] += FREQ_INCR * (4 + channelIndex);
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if( data->phases[channelIndex] >= (2.0 * M_PI) ) data->phases[channelIndex] -= (2.0 * M_PI);
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}
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}
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}
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else
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{
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for( frameIndex=0; frameIndex<(int)framesPerBuffer; frameIndex++ )
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{
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for( channelIndex=0; channelIndex<data->numChannels; channelIndex++ )
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{
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/* Output sine wave on every channel. */
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outputs[channelIndex][frameIndex] = (float) sin(data->phases[channelIndex]);
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/* Play each channel at a higher frequency. */
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data->phases[channelIndex] += FREQ_INCR * (4 + channelIndex);
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if( data->phases[channelIndex] >= (2.0 * M_PI) ) data->phases[channelIndex] -= (2.0 * M_PI);
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}
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}
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}
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return 0;
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}
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/*******************************************************************/
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int test(short interleaved)
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{
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PaStream* stream;
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PaStreamParameters outputParameters;
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PaError err;
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const PaDeviceInfo* pdi;
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paTestData data;
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short n;
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outputParameters.device = Pa_GetDefaultOutputDevice(); /* Default output device, max channels. */
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pdi = Pa_GetDeviceInfo(outputParameters.device);
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outputParameters.channelCount = pdi->maxOutputChannels;
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if (outputParameters.channelCount > MAX_CHANNELS)
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outputParameters.channelCount = MAX_CHANNELS;
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outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
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outputParameters.suggestedLatency = pdi->defaultLowOutputLatency;
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outputParameters.hostApiSpecificStreamInfo = NULL;
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data.interleaved = interleaved;
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data.numChannels = outputParameters.channelCount;
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for (n = 0; n < data.numChannels; n++)
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data.phases[n] = 0.0; /* Phases wrap and maybe don't need initialisation. */
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printf("%d ", data.numChannels);
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if (interleaved)
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printf("interleaved ");
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else
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{
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printf(" non-interleaved ");
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outputParameters.sampleFormat |= paNonInterleaved;
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}
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printf("channels.\n");
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err = Pa_OpenStream(&stream,
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NULL, /* No input. */
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&outputParameters,
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SAMPLE_RATE, /* Sample rate. */
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FRAMES_PER_BUFFER, /* Frames per buffer. */
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paClipOff, /* Samples never out of range, no clipping. */
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patestCallback,
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&data);
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if (err == paNoError)
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{
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err = Pa_StartStream(stream);
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if (err == paNoError)
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{
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printf("Hit ENTER to stop this test.\n");
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getchar();
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err = Pa_StopStream(stream);
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}
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Pa_CloseStream( stream );
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}
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return err;
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}
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/*******************************************************************/
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int main(void)
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{
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PaError err;
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printf("PortAudio Test: output sine wave on each channel.\n" );
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err = Pa_Initialize();
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if (err != paNoError)
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goto done;
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err = test(1); /* 1 means interleaved. */
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if (err != paNoError)
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goto done;
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err = test(0); /* 0 means not interleaved. */
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if (err != paNoError)
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goto done;
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printf("Test finished.\n");
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done:
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if (err)
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{
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fprintf(stderr, "An error occured while using the portaudio stream\n");
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fprintf(stderr, "Error number: %d\n", err );
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fprintf(stderr, "Error message: %s\n", Pa_GetErrorText(err));
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}
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Pa_Terminate();
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return 0;
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}
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