325 lines
11 KiB
C
325 lines
11 KiB
C
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/** @file patest_stop.c
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@ingroup test_src
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@brief Test different ways of stopping audio.
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Test the three ways of stopping audio:
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- calling Pa_StopStream(),
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- calling Pa_AbortStream(),
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- and returning a 1 from the callback function.
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A long latency is set up so that you can hear the difference.
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Then a simple 8 note sequence is repeated twice.
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The program will print what you should hear.
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@author Phil Burk <philburk@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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* 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 OUTPUT_DEVICE (Pa_GetDefaultOutputDevice())
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#define SLEEP_DUR (200)
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (256)
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#define LATENCY_SECONDS (3.f)
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#define FRAMES_PER_NOTE (SAMPLE_RATE/2)
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#define MAX_REPEATS (2)
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#define FUNDAMENTAL (400.0f / SAMPLE_RATE)
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#define NOTE_0 (FUNDAMENTAL * 1.0f / 1.0f)
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#define NOTE_1 (FUNDAMENTAL * 5.0f / 4.0f)
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#define NOTE_2 (FUNDAMENTAL * 4.0f / 3.0f)
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#define NOTE_3 (FUNDAMENTAL * 3.0f / 2.0f)
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#define NOTE_4 (FUNDAMENTAL * 2.0f / 1.0f)
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#define MODE_FINISH (0)
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#define MODE_STOP (1)
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#define MODE_ABORT (2)
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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 (400)
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typedef struct
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{
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float waveform[TABLE_SIZE + 1]; /* Add one for guard point for interpolation. */
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float phase_increment;
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float phase;
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float *tune;
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int notesPerTune;
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int frameCounter;
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int noteCounter;
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int repeatCounter;
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PaTime outTime;
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int stopMode;
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int done;
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}
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paTestData;
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/************* Prototypes *****************************/
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int TestStopMode( paTestData *data );
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float LookupWaveform( paTestData *data, float phase );
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/******************************************************
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* Convert phase between 0.0 and 1.0 to waveform value
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* using linear interpolation.
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*/
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float LookupWaveform( paTestData *data, float phase )
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{
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float fIndex = phase*TABLE_SIZE;
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int index = (int) fIndex;
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float fract = fIndex - index;
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float lo = data->waveform[index];
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float hi = data->waveform[index+1];
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float val = lo + fract*(hi-lo);
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return val;
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}
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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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float value;
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unsigned int i = 0;
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int finished = paContinue;
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(void) inputBuffer; /* Prevent unused variable warnings. */
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(void) timeInfo;
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(void) statusFlags;
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/* data->outTime = outTime; */
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if( !data->done )
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{
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for( i=0; i<framesPerBuffer; i++ )
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{
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/* Are we done with this note? */
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if( data->frameCounter >= FRAMES_PER_NOTE )
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{
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data->noteCounter += 1;
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data->frameCounter = 0;
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/* Are we done with this tune? */
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if( data->noteCounter >= data->notesPerTune )
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{
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data->noteCounter = 0;
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data->repeatCounter += 1;
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/* Are we totally done? */
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if( data->repeatCounter >= MAX_REPEATS )
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{
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data->done = 1;
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if( data->stopMode == MODE_FINISH )
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{
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finished = paComplete;
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break;
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}
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}
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}
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data->phase_increment = data->tune[data->noteCounter];
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}
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value = LookupWaveform(data, data->phase);
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*out++ = value; /* left */
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*out++ = value; /* right */
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data->phase += data->phase_increment;
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if( data->phase >= 1.0f ) data->phase -= 1.0f;
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data->frameCounter += 1;
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}
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}
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/* zero remainder of final buffer */
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for( ; i<framesPerBuffer; i++ )
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{
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*out++ = 0; /* left */
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*out++ = 0; /* 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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paTestData data;
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int i;
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float simpleTune[] = { NOTE_0, NOTE_1, NOTE_2, NOTE_3, NOTE_4, NOTE_3, NOTE_2, NOTE_1 };
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printf("PortAudio Test: play song and test stopping. ask for %f seconds latency\n", LATENCY_SECONDS );
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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.waveform[i] = (float) (
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(0.2 * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. )) +
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(0.2 * sin( ((double)(3*i)/(double)TABLE_SIZE) * M_PI * 2. )) +
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(0.1 * sin( ((double)(5*i)/(double)TABLE_SIZE) * M_PI * 2. ))
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);
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}
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data.waveform[TABLE_SIZE] = data.waveform[0]; /* Set guard point. */
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data.tune = &simpleTune[0];
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data.notesPerTune = sizeof(simpleTune) / sizeof(float);
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printf("Test MODE_FINISH - callback returns 1.\n");
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printf("Should hear entire %d note tune repeated twice.\n", data.notesPerTune);
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data.stopMode = MODE_FINISH;
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if( TestStopMode( &data ) != paNoError )
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{
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printf("Test of MODE_FINISH failed!\n");
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goto error;
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}
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printf("Test MODE_STOP - stop when song is done.\n");
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printf("Should hear entire %d note tune repeated twice.\n", data.notesPerTune);
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data.stopMode = MODE_STOP;
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if( TestStopMode( &data ) != paNoError )
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{
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printf("Test of MODE_STOP failed!\n");
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goto error;
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}
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printf("Test MODE_ABORT - abort immediately.\n");
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printf("Should hear last repetition cut short by %f seconds.\n", LATENCY_SECONDS);
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data.stopMode = MODE_ABORT;
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if( TestStopMode( &data ) != paNoError )
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{
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printf("Test of MODE_ABORT failed!\n");
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goto error;
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}
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return 0;
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error:
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return 1;
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}
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int TestStopMode( paTestData *data )
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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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data->done = 0;
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data->phase = 0.0;
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data->frameCounter = 0;
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data->noteCounter = 0;
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data->repeatCounter = 0;
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data->phase_increment = data->tune[data->noteCounter];
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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outputParameters.device = 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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outputParameters.suggestedLatency = LATENCY_SECONDS;
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outputParameters.hostApiSpecificStreamInfo = NULL;
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err = Pa_OpenStream(
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&stream,
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NULL, /* no input */
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&outputParameters,
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SAMPLE_RATE,
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FRAMES_PER_BUFFER, /* 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 ) goto error;
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err = Pa_StartStream( stream );
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if( err != paNoError ) goto error;
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if( data->stopMode == MODE_FINISH )
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{
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while( ( err = Pa_IsStreamActive( stream ) ) == 1 )
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{
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/*printf("outTime = %g, note# = %d, repeat# = %d\n", data->outTime,
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data->noteCounter, data->repeatCounter );
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fflush(stdout); */
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Pa_Sleep( SLEEP_DUR );
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}
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if( err < 0 ) goto error;
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}
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else
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{
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while( data->repeatCounter < MAX_REPEATS )
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{
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/*printf("outTime = %g, note# = %d, repeat# = %d\n", data->outTime,
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data->noteCounter, data->repeatCounter );
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fflush(stdout); */
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Pa_Sleep( SLEEP_DUR );
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}
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}
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if( data->stopMode == MODE_ABORT )
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{
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printf("Call Pa_AbortStream()\n");
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err = Pa_AbortStream( stream );
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}
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else
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{
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printf("Call Pa_StopStream()\n");
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err = Pa_StopStream( stream );
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}
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if( err != paNoError ) goto error;
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printf("Call Pa_CloseStream()\n"); fflush(stdout);
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err = Pa_CloseStream( stream );
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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 occurred 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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