243 lines
8.9 KiB
C
243 lines
8.9 KiB
C
/** @file patest_sine.c
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@ingroup test_src
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@brief Play a sine wave for several seconds.
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@author Ross Bencina <rossb@audiomulch.com>
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@author Phil Burk <philburk@softsynth.com>
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*/
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/*
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* $Id: patest_sine.c 1368 2008-03-01 00:38:27Z rossb $
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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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* 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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* The text above constitutes the entire PortAudio license; however,
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* the PortAudio community also makes the following non-binding requests:
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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. It is also
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* requested that these non-binding requests be included along with the
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* license above.
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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 NUM_SECONDS (5)
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (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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#define TABLE_SIZE (200)
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typedef struct
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{
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float sine[TABLE_SIZE];
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int left_phase;
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int right_phase;
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char message[20];
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int minFramesPerBuffer;
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int maxFramesPerBuffer;
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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, 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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paTestData *data = (paTestData*)userData;
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float *out = (float*)outputBuffer;
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unsigned long i;
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(void) timeInfo; /* Prevent unused variable warnings. */
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(void) statusFlags;
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(void) inputBuffer;
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if( data->minFramesPerBuffer > framesPerBuffer )
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{
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data->minFramesPerBuffer = framesPerBuffer;
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}
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if( data->maxFramesPerBuffer < framesPerBuffer )
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{
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data->maxFramesPerBuffer = framesPerBuffer;
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}
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for( i=0; i<framesPerBuffer; i++ )
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{
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*out++ = data->sine[data->left_phase]; /* left */
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*out++ = data->sine[data->right_phase]; /* right */
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data->left_phase += 1;
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if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
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data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
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if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
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}
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return paContinue;
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}
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PaError paqaCheckLatency( PaStreamParameters *outputParamsPtr,
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paTestData *dataPtr, double sampleRate, unsigned long framesPerBuffer )
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{
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PaError err;
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PaStream *stream;
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const PaStreamInfo* streamInfo;
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dataPtr->minFramesPerBuffer = 9999999;
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dataPtr->maxFramesPerBuffer = 0;
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printf("-------------------------------------\n");
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printf("Stream parameter: suggestedOutputLatency = %g\n", outputParamsPtr->suggestedLatency );
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if( framesPerBuffer == paFramesPerBufferUnspecified ){
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printf("Stream parameter: user framesPerBuffer = paFramesPerBufferUnspecified\n" );
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}else{
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printf("Stream parameter: user framesPerBuffer = %d\n", framesPerBuffer );
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}
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err = Pa_OpenStream(
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&stream,
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NULL, /* no input */
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outputParamsPtr,
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sampleRate,
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framesPerBuffer,
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paClipOff, /* we won't output out of range samples so don't bother clipping them */
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patestCallback,
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dataPtr );
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if( err != paNoError ) goto error1;
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streamInfo = Pa_GetStreamInfo( stream );
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printf("Stream info: inputLatency = %g\n", streamInfo->inputLatency );
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printf("Stream info: outputLatency = %g\n", streamInfo->outputLatency );
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err = Pa_StartStream( stream );
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if( err != paNoError ) goto error2;
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printf("Play for %d seconds.\n", NUM_SECONDS );
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Pa_Sleep( NUM_SECONDS * 1000 );
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printf(" minFramesPerBuffer = %4d\n", dataPtr->minFramesPerBuffer );
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printf(" maxFramesPerBuffer = %4d\n", dataPtr->maxFramesPerBuffer );
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err = Pa_StopStream( stream );
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if( err != paNoError ) goto error2;
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err = Pa_CloseStream( stream );
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Pa_Sleep( 1 * 1000 );
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return err;
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error2:
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Pa_CloseStream( stream );
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error1:
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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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int main(void)
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{
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PaStreamParameters outputParameters;
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PaError err;
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paTestData data;
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const PaDeviceInfo *deviceInfo;
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int i;
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int framesPerBuffer;
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double sampleRate = 44100;
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printf("PortAudio QA: investigate output latency. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
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/* initialise sinusoidal wavetable */
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for( i=0; i<TABLE_SIZE; i++ )
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{
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data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
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}
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data.left_phase = data.right_phase = 0;
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
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if (outputParameters.device == paNoDevice) {
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fprintf(stderr,"Error: No default output device.\n");
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goto error;
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}
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outputParameters.channelCount = 2; /* stereo output */
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outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
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deviceInfo = Pa_GetDeviceInfo( outputParameters.device );
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printf("using device #%d: '%s' (%s)\n", outputParameters.device, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name);
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printf("defaultLowOutputLatency = %f seconds\n", deviceInfo->defaultLowOutputLatency);
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printf("defaultHighOutputLatency = %f seconds\n", deviceInfo->defaultHighOutputLatency);
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outputParameters.hostApiSpecificStreamInfo = NULL;
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// Try to use a small buffer that is smaller than we think the device can handle.
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// Try to force combining multiple user buffers into a host buffer.
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framesPerBuffer = 8;
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outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency;
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err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer );
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if( err != paNoError ) goto error;
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// Try to create a huge buffer that is bigger than the allowed device maximum.
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framesPerBuffer = 16*1024;
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outputParameters.suggestedLatency = ((double)framesPerBuffer) / sampleRate; // approximate
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err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer );
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if( err != paNoError ) goto error;
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outputParameters.suggestedLatency = 0.0;
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err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
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if( err != paNoError ) goto error;
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outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency;
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err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
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if( err != paNoError ) goto error;
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outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency;
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err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
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if( err != paNoError ) goto error;
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outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency * 4;
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err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
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if( err != paNoError ) goto error;
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Pa_Terminate();
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printf("Test finished.\n");
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return err;
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error:
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Pa_Terminate();
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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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return err;
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}
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