Chris@39: /** @file patest_maxsines.c Chris@39: @ingroup test_src Chris@39: @brief How many sine waves can we calculate and play in less than 80% CPU Load. Chris@39: @author Ross Bencina Chris@39: @author Phil Burk Chris@39: */ Chris@39: /* Chris@39: * $Id: patest_maxsines.c 1368 2008-03-01 00:38:27Z rossb $ Chris@39: * Chris@39: * This program uses the PortAudio Portable Audio Library. Chris@39: * For more information see: http://www.portaudio.com Chris@39: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk Chris@39: * Chris@39: * Permission is hereby granted, free of charge, to any person obtaining Chris@39: * a copy of this software and associated documentation files Chris@39: * (the "Software"), to deal in the Software without restriction, Chris@39: * including without limitation the rights to use, copy, modify, merge, Chris@39: * publish, distribute, sublicense, and/or sell copies of the Software, Chris@39: * and to permit persons to whom the Software is furnished to do so, Chris@39: * subject to the following conditions: Chris@39: * Chris@39: * The above copyright notice and this permission notice shall be Chris@39: * included in all copies or substantial portions of the Software. Chris@39: * Chris@39: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, Chris@39: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF Chris@39: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. Chris@39: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR Chris@39: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF Chris@39: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION Chris@39: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Chris@39: */ Chris@39: Chris@39: /* Chris@39: * The text above constitutes the entire PortAudio license; however, Chris@39: * the PortAudio community also makes the following non-binding requests: Chris@39: * Chris@39: * Any person wishing to distribute modifications to the Software is Chris@39: * requested to send the modifications to the original developer so that Chris@39: * they can be incorporated into the canonical version. It is also Chris@39: * requested that these non-binding requests be included along with the Chris@39: * license above. Chris@39: */ Chris@39: Chris@39: #include Chris@39: #include Chris@39: #include "portaudio.h" Chris@39: Chris@39: #define MAX_SINES (500) Chris@39: #define MAX_USAGE (0.8) Chris@39: #define SAMPLE_RATE (44100) Chris@39: #define FREQ_TO_PHASE_INC(freq) (freq/(float)SAMPLE_RATE) Chris@39: Chris@39: #define MIN_PHASE_INC FREQ_TO_PHASE_INC(200.0f) Chris@39: #define MAX_PHASE_INC (MIN_PHASE_INC * (1 << 5)) Chris@39: Chris@39: #define FRAMES_PER_BUFFER (512) Chris@39: #ifndef M_PI Chris@39: #define M_PI (3.14159265) Chris@39: #endif Chris@39: #define TWOPI (M_PI * 2.0) Chris@39: Chris@39: #define TABLE_SIZE (512) Chris@39: Chris@39: typedef struct paTestData Chris@39: { Chris@39: int numSines; Chris@39: float sine[TABLE_SIZE + 1]; /* add one for guard point for interpolation */ Chris@39: float phases[MAX_SINES]; Chris@39: } Chris@39: paTestData; Chris@39: Chris@39: /* Convert phase between and 1.0 to sine value Chris@39: * using linear interpolation. Chris@39: */ Chris@39: float LookupSine( paTestData *data, float phase ); Chris@39: float LookupSine( paTestData *data, float phase ) Chris@39: { Chris@39: float fIndex = phase*TABLE_SIZE; Chris@39: int index = (int) fIndex; Chris@39: float fract = fIndex - index; Chris@39: float lo = data->sine[index]; Chris@39: float hi = data->sine[index+1]; Chris@39: float val = lo + fract*(hi-lo); Chris@39: return val; Chris@39: } Chris@39: Chris@39: /* This routine will be called by the PortAudio engine when audio is needed. Chris@39: ** It may called at interrupt level on some machines so don't do anything Chris@39: ** that could mess up the system like calling malloc() or free(). Chris@39: */ Chris@39: static int patestCallback(const void* inputBuffer, Chris@39: void* outputBuffer, Chris@39: unsigned long framesPerBuffer, Chris@39: const PaStreamCallbackTimeInfo* timeInfo, Chris@39: PaStreamCallbackFlags statusFlags, Chris@39: void* userData ) Chris@39: { Chris@39: paTestData *data = (paTestData*)userData; Chris@39: float *out = (float*)outputBuffer; Chris@39: float outSample; Chris@39: float scaler; Chris@39: int numForScale; Chris@39: unsigned long i; Chris@39: int j; Chris@39: int finished = 0; Chris@39: (void) inputBuffer; /* Prevent unused argument warning. */ Chris@39: Chris@39: /* Determine amplitude scaling factor */ Chris@39: numForScale = data->numSines; Chris@39: if( numForScale < 8 ) numForScale = 8; /* prevent pops at beginning */ Chris@39: scaler = 1.0f / numForScale; Chris@39: Chris@39: for( i=0; inumSines; j++ ) Chris@39: { Chris@39: /* Advance phase of next oscillator. */ Chris@39: phase = data->phases[j]; Chris@39: phase += phaseInc; Chris@39: if( phase >= 1.0 ) phase -= 1.0; Chris@39: Chris@39: output += LookupSine(data, phase); Chris@39: data->phases[j] = phase; Chris@39: Chris@39: phaseInc *= 1.02f; Chris@39: if( phaseInc > MAX_PHASE_INC ) phaseInc = MIN_PHASE_INC; Chris@39: } Chris@39: Chris@39: outSample = (float) (output * scaler); Chris@39: *out++ = outSample; /* Left */ Chris@39: *out++ = outSample; /* Right */ Chris@39: } Chris@39: return finished; Chris@39: } Chris@39: Chris@39: /*******************************************************************/ Chris@39: int main(void); Chris@39: int main(void) Chris@39: { Chris@39: int i; Chris@39: PaStream* stream; Chris@39: PaStreamParameters outputParameters; Chris@39: PaError err; Chris@39: paTestData data = {0}; Chris@39: double load; Chris@39: Chris@39: printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); Chris@39: Chris@39: /* initialise sinusoidal wavetable */ Chris@39: for( i=0; idefaultHighOutputLatency; Chris@39: err = Pa_OpenStream(&stream, Chris@39: NULL, /* no input */ Chris@39: &outputParameters, Chris@39: SAMPLE_RATE, Chris@39: FRAMES_PER_BUFFER, Chris@39: paClipOff, /* No out of range samples should occur. */ Chris@39: patestCallback, Chris@39: &data); Chris@39: if( err != paNoError ) Chris@39: goto error; Chris@39: Chris@39: err = Pa_StartStream( stream ); Chris@39: if( err != paNoError ) Chris@39: goto error; Chris@39: Chris@39: /* Play an increasing number of sine waves until we hit MAX_USAGE */ Chris@39: do { Chris@39: data.numSines++; Chris@39: Pa_Sleep(200); Chris@39: load = Pa_GetStreamCpuLoad(stream); Chris@39: printf("numSines = %d, CPU load = %f\n", data.numSines, load ); Chris@39: fflush(stdout); Chris@39: } while((load < MAX_USAGE) && (data.numSines < MAX_SINES)); Chris@39: Chris@39: Pa_Sleep(2000); /* Stay for 2 seconds around 80% CPU. */ Chris@39: Chris@39: err = Pa_StopStream( stream ); Chris@39: if( err != paNoError ) Chris@39: goto error; Chris@39: Chris@39: err = Pa_CloseStream( stream ); Chris@39: if( err != paNoError ) Chris@39: goto error; Chris@39: Chris@39: Pa_Terminate(); Chris@39: printf("Test finished.\n"); Chris@39: return err; Chris@39: error: Chris@39: Pa_Terminate(); Chris@39: fprintf( stderr, "An error occured while using the portaudio stream\n" ); Chris@39: fprintf( stderr, "Error number: %d\n", err ); Chris@39: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); Chris@39: return err; Chris@39: }