mirror of
https://github.com/cookiengineer/audacity
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217 lines
7.1 KiB
C
217 lines
7.1 KiB
C
/** @file patest_sine8.c
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@ingroup test_src
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@brief Test 8 bit data: play a sine wave for several seconds.
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@author Ross Bencina <rossb@audiomulch.com>
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*/
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/*
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* $Id: patest_sine8.c 1748 2011-09-01 22:08:32Z philburk $
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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 (8)
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#define SAMPLE_RATE (44100)
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#define TABLE_SIZE (200)
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#define TEST_UNSIGNED (0)
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#if TEST_UNSIGNED
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#define TEST_FORMAT paUInt8
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typedef unsigned char sample_t;
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#define SILENCE ((sample_t)0x80)
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#else
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#define TEST_FORMAT paInt8
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typedef char sample_t;
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#define SILENCE ((sample_t)0x00)
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#endif
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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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sample_t sine[TABLE_SIZE];
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int left_phase;
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int right_phase;
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unsigned int framesToGo;
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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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sample_t *out = (sample_t*)outputBuffer;
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int i;
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int framesToCalc;
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int finished = 0;
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(void) inputBuffer; /* Prevent unused variable warnings. */
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if( data->framesToGo < framesPerBuffer )
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{
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framesToCalc = data->framesToGo;
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data->framesToGo = 0;
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finished = 1;
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}
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else
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{
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framesToCalc = framesPerBuffer;
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data->framesToGo -= framesPerBuffer;
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}
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for( i=0; i<framesToCalc; 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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/* zero remainder of final buffer */
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for( ; i<(int)framesPerBuffer; i++ )
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{
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*out++ = SILENCE; /* left */
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*out++ = SILENCE; /* right */
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}
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return finished;
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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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PaStream* stream;
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PaError err;
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paTestData data;
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PaTime streamOpened;
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int i, totalSamps;
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#if TEST_UNSIGNED
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printf("PortAudio Test: output UNsigned 8 bit sine wave.\n");
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#else
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printf("PortAudio Test: output signed 8 bit sine wave.\n");
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#endif
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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] = SILENCE + (char) (127.0 * 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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data.framesToGo = totalSamps = NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */
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err = Pa_Initialize();
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if( err != paNoError )
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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 = TEST_FORMAT;
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outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
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outputParameters.hostApiSpecificStreamInfo = NULL;
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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,
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256, /* Frames per buffer. */
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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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&data );
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if( err != paNoError )
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goto error;
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streamOpened = Pa_GetStreamTime( stream ); /* Time in seconds when stream was opened (approx). */
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err = Pa_StartStream( stream );
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if( err != paNoError )
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goto error;
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/* Watch until sound is halfway finished. */
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/* (Was ( Pa_StreamTime( stream ) < (totalSamps/2) ) in V18. */
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while( (Pa_GetStreamTime( stream ) - streamOpened) < (PaTime)NUM_SECONDS / 2.0 )
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Pa_Sleep(10);
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/* Stop sound. */
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printf("Stopping Stream.\n");
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err = Pa_StopStream( stream );
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if( err != paNoError )
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goto error;
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printf("Pause for 2 seconds.\n");
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Pa_Sleep( 2000 );
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printf("Starting again.\n");
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err = Pa_StartStream( stream );
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if( err != paNoError )
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goto error;
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printf("Waiting for sound to finish.\n");
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while( ( err = Pa_IsStreamActive( stream ) ) == 1 )
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Pa_Sleep(100);
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if( err < 0 )
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goto error;
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err = Pa_CloseStream( stream );
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if( err != paNoError )
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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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