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Diffstat (limited to 'portaudio/test/patest_maxsines.c')
| -rw-r--r-- | portaudio/test/patest_maxsines.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/portaudio/test/patest_maxsines.c b/portaudio/test/patest_maxsines.c new file mode 100644 index 0000000..79e7de0 --- /dev/null +++ b/portaudio/test/patest_maxsines.c @@ -0,0 +1,212 @@ +/** @file patest_maxsines.c + @ingroup test_src + @brief How many sine waves can we calculate and play in less than 80% CPU Load. + @author Ross Bencina <rossb@audiomulch.com> + @author Phil Burk <philburk@softsynth.com> +*/ +/* + * $Id: patest_maxsines.c 1097 2006-08-26 08:27:53Z rossb $ + * + * 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 MAX_SINES (500) +#define MAX_USAGE (0.8) +#define SAMPLE_RATE (44100) +#define FREQ_TO_PHASE_INC(freq) (freq/(float)SAMPLE_RATE) + +#define MIN_PHASE_INC FREQ_TO_PHASE_INC(200.0f) +#define MAX_PHASE_INC (MIN_PHASE_INC * (1 << 5)) + +#define FRAMES_PER_BUFFER (512) +#ifndef M_PI +#define M_PI (3.14159265) +#endif +#define TWOPI (M_PI * 2.0) + +#define TABLE_SIZE (512) + +typedef struct paTestData +{ + int numSines; + float sine[TABLE_SIZE + 1]; /* add one for guard point for interpolation */ + float phases[MAX_SINES]; +} +paTestData; + +/* Convert phase between and 1.0 to sine value + * using linear interpolation. + */ +float LookupSine( paTestData *data, float phase ); +float LookupSine( paTestData *data, float phase ) +{ + float fIndex = phase*TABLE_SIZE; + int index = (int) fIndex; + float fract = fIndex - index; + float lo = data->sine[index]; + float hi = data->sine[index+1]; + float val = lo + fract*(hi-lo); + return val; +} + +/* 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 patestCallback(const void* inputBuffer, + void* outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void* userData ) +{ + paTestData *data = (paTestData*)userData; + float *out = (float*)outputBuffer; + float outSample; + float scaler; + int numForScale; + unsigned long i; + int j; + int finished = 0; + (void) inputBuffer; /* Prevent unused argument warning. */ + + /* Determine amplitude scaling factor */ + numForScale = data->numSines; + if( numForScale < 8 ) numForScale = 8; /* prevent pops at beginning */ + scaler = 1.0f / numForScale; + + for( i=0; i<framesPerBuffer; i++ ) + { + float output = 0.0; + float phaseInc = MIN_PHASE_INC; + float phase; + for( j=0; j<data->numSines; j++ ) + { + /* Advance phase of next oscillator. */ + phase = data->phases[j]; + phase += phaseInc; + if( phase >= 1.0 ) phase -= 1.0; + + output += LookupSine(data, phase); + data->phases[j] = phase; + + phaseInc *= 1.02f; + if( phaseInc > MAX_PHASE_INC ) phaseInc = MIN_PHASE_INC; + } + + outSample = (float) (output * scaler); + *out++ = outSample; /* Left */ + *out++ = outSample; /* Right */ + } + return finished; +} + +/*******************************************************************/ +int main(void); +int main(void) +{ + int i; + PaStream* stream; + PaStreamParameters outputParameters; + PaError err; + paTestData data = {0}; + double load; + + printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); + + /* initialise sinusoidal wavetable */ + for( i=0; i<TABLE_SIZE; i++ ) + { + data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); + } + data.sine[TABLE_SIZE] = data.sine[0]; /* set guard point */ + + err = Pa_Initialize(); + if( err != paNoError ) + goto error; + outputParameters.device = Pa_GetDefaultOutputDevice(); /* Default output device. */ + outputParameters.channelCount = 2; /* Stereo output. */ + outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output. */ + outputParameters.hostApiSpecificStreamInfo = NULL; + outputParameters.suggestedLatency = Pa_GetDeviceInfo(outputParameters.device) + ->defaultHighOutputLatency; + err = Pa_OpenStream(&stream, + NULL, /* no input */ + &outputParameters, + SAMPLE_RATE, + FRAMES_PER_BUFFER, + paClipOff, /* No out of range samples should occur. */ + patestCallback, + &data); + if( err != paNoError ) + goto error; + + err = Pa_StartStream( stream ); + if( err != paNoError ) + goto error; + + /* Play an increasing number of sine waves until we hit MAX_USAGE */ + do { + data.numSines++; + Pa_Sleep(200); + load = Pa_GetStreamCpuLoad(stream); + printf("numSines = %d, CPU load = %f\n", data.numSines, load ); + fflush(stdout); + } while((load < MAX_USAGE) && (data.numSines < MAX_SINES)); + + Pa_Sleep(2000); /* Stay for 2 seconds around 80% CPU. */ + + err = Pa_StopStream( stream ); + if( err != paNoError ) + goto error; + + err = Pa_CloseStream( stream ); + if( err != paNoError ) + goto error; + + Pa_Terminate(); + printf("Test finished.\n"); + return err; +error: + Pa_Terminate(); + fprintf( stderr, "An error occured while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return err; +} |