Chris@4: /** @file patest_maxsines.c Chris@4: @ingroup test_src Chris@4: @brief How many sine waves can we calculate and play in less than 80% CPU Load. Chris@4: @author Ross Bencina Chris@4: @author Phil Burk Chris@4: */ Chris@4: /* Chris@4: * $Id: patest_maxsines.c 1368 2008-03-01 00:38:27Z rossb $ Chris@4: * Chris@4: * This program uses the PortAudio Portable Audio Library. Chris@4: * For more information see: http://www.portaudio.com Chris@4: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk Chris@4: * Chris@4: * Permission is hereby granted, free of charge, to any person obtaining Chris@4: * a copy of this software and associated documentation files Chris@4: * (the "Software"), to deal in the Software without restriction, Chris@4: * including without limitation the rights to use, copy, modify, merge, Chris@4: * publish, distribute, sublicense, and/or sell copies of the Software, Chris@4: * and to permit persons to whom the Software is furnished to do so, Chris@4: * subject to the following conditions: Chris@4: * Chris@4: * The above copyright notice and this permission notice shall be Chris@4: * included in all copies or substantial portions of the Software. Chris@4: * Chris@4: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, Chris@4: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF Chris@4: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. Chris@4: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR Chris@4: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF Chris@4: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION Chris@4: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Chris@4: */ Chris@4: Chris@4: /* Chris@4: * The text above constitutes the entire PortAudio license; however, Chris@4: * the PortAudio community also makes the following non-binding requests: Chris@4: * Chris@4: * Any person wishing to distribute modifications to the Software is Chris@4: * requested to send the modifications to the original developer so that Chris@4: * they can be incorporated into the canonical version. It is also Chris@4: * requested that these non-binding requests be included along with the Chris@4: * license above. Chris@4: */ Chris@4: Chris@4: #include Chris@4: #include Chris@4: #include "portaudio.h" Chris@4: Chris@4: #define MAX_SINES (500) Chris@4: #define MAX_USAGE (0.8) Chris@4: #define SAMPLE_RATE (44100) Chris@4: #define FREQ_TO_PHASE_INC(freq) (freq/(float)SAMPLE_RATE) Chris@4: Chris@4: #define MIN_PHASE_INC FREQ_TO_PHASE_INC(200.0f) Chris@4: #define MAX_PHASE_INC (MIN_PHASE_INC * (1 << 5)) Chris@4: Chris@4: #define FRAMES_PER_BUFFER (512) Chris@4: #ifndef M_PI Chris@4: #define M_PI (3.14159265) Chris@4: #endif Chris@4: #define TWOPI (M_PI * 2.0) Chris@4: Chris@4: #define TABLE_SIZE (512) Chris@4: Chris@4: typedef struct paTestData Chris@4: { Chris@4: int numSines; Chris@4: float sine[TABLE_SIZE + 1]; /* add one for guard point for interpolation */ Chris@4: float phases[MAX_SINES]; Chris@4: } Chris@4: paTestData; Chris@4: Chris@4: /* Convert phase between and 1.0 to sine value Chris@4: * using linear interpolation. Chris@4: */ Chris@4: float LookupSine( paTestData *data, float phase ); Chris@4: float LookupSine( paTestData *data, float phase ) Chris@4: { Chris@4: float fIndex = phase*TABLE_SIZE; Chris@4: int index = (int) fIndex; Chris@4: float fract = fIndex - index; Chris@4: float lo = data->sine[index]; Chris@4: float hi = data->sine[index+1]; Chris@4: float val = lo + fract*(hi-lo); Chris@4: return val; Chris@4: } Chris@4: Chris@4: /* This routine will be called by the PortAudio engine when audio is needed. Chris@4: ** It may called at interrupt level on some machines so don't do anything Chris@4: ** that could mess up the system like calling malloc() or free(). Chris@4: */ Chris@4: static int patestCallback(const void* inputBuffer, Chris@4: void* outputBuffer, Chris@4: unsigned long framesPerBuffer, Chris@4: const PaStreamCallbackTimeInfo* timeInfo, Chris@4: PaStreamCallbackFlags statusFlags, Chris@4: void* userData ) Chris@4: { Chris@4: paTestData *data = (paTestData*)userData; Chris@4: float *out = (float*)outputBuffer; Chris@4: float outSample; Chris@4: float scaler; Chris@4: int numForScale; Chris@4: unsigned long i; Chris@4: int j; Chris@4: int finished = 0; Chris@4: (void) inputBuffer; /* Prevent unused argument warning. */ Chris@4: Chris@4: /* Determine amplitude scaling factor */ Chris@4: numForScale = data->numSines; Chris@4: if( numForScale < 8 ) numForScale = 8; /* prevent pops at beginning */ Chris@4: scaler = 1.0f / numForScale; Chris@4: Chris@4: for( i=0; inumSines; j++ ) Chris@4: { Chris@4: /* Advance phase of next oscillator. */ Chris@4: phase = data->phases[j]; Chris@4: phase += phaseInc; Chris@4: if( phase >= 1.0 ) phase -= 1.0; Chris@4: Chris@4: output += LookupSine(data, phase); Chris@4: data->phases[j] = phase; Chris@4: Chris@4: phaseInc *= 1.02f; Chris@4: if( phaseInc > MAX_PHASE_INC ) phaseInc = MIN_PHASE_INC; Chris@4: } Chris@4: Chris@4: outSample = (float) (output * scaler); Chris@4: *out++ = outSample; /* Left */ Chris@4: *out++ = outSample; /* Right */ Chris@4: } Chris@4: return finished; Chris@4: } Chris@4: Chris@4: /*******************************************************************/ Chris@4: int main(void); Chris@4: int main(void) Chris@4: { Chris@4: int i; Chris@4: PaStream* stream; Chris@4: PaStreamParameters outputParameters; Chris@4: PaError err; Chris@4: paTestData data = {0}; Chris@4: double load; Chris@4: Chris@4: printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); Chris@4: Chris@4: /* initialise sinusoidal wavetable */ Chris@4: for( i=0; idefaultHighOutputLatency; Chris@4: err = Pa_OpenStream(&stream, Chris@4: NULL, /* no input */ Chris@4: &outputParameters, Chris@4: SAMPLE_RATE, Chris@4: FRAMES_PER_BUFFER, Chris@4: paClipOff, /* No out of range samples should occur. */ Chris@4: patestCallback, Chris@4: &data); Chris@4: if( err != paNoError ) Chris@4: goto error; Chris@4: Chris@4: err = Pa_StartStream( stream ); Chris@4: if( err != paNoError ) Chris@4: goto error; Chris@4: Chris@4: /* Play an increasing number of sine waves until we hit MAX_USAGE */ Chris@4: do { Chris@4: data.numSines++; Chris@4: Pa_Sleep(200); Chris@4: load = Pa_GetStreamCpuLoad(stream); Chris@4: printf("numSines = %d, CPU load = %f\n", data.numSines, load ); Chris@4: fflush(stdout); Chris@4: } while((load < MAX_USAGE) && (data.numSines < MAX_SINES)); Chris@4: Chris@4: Pa_Sleep(2000); /* Stay for 2 seconds around 80% CPU. */ Chris@4: Chris@4: err = Pa_StopStream( stream ); Chris@4: if( err != paNoError ) Chris@4: goto error; Chris@4: Chris@4: err = Pa_CloseStream( stream ); Chris@4: if( err != paNoError ) Chris@4: goto error; Chris@4: Chris@4: Pa_Terminate(); Chris@4: printf("Test finished.\n"); Chris@4: return err; Chris@4: error: Chris@4: Pa_Terminate(); Chris@4: fprintf( stderr, "An error occured while using the portaudio stream\n" ); Chris@4: fprintf( stderr, "Error number: %d\n", err ); Chris@4: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); Chris@4: return err; Chris@4: }