cannam@162: /** @file patest_maxsines.c cannam@162: @ingroup test_src cannam@162: @brief How many sine waves can we calculate and play in less than 80% CPU Load. cannam@162: @author Ross Bencina cannam@162: @author Phil Burk cannam@162: */ cannam@162: /* cannam@162: * $Id$ cannam@162: * cannam@162: * This program uses the PortAudio Portable Audio Library. cannam@162: * For more information see: http://www.portaudio.com cannam@162: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@162: * cannam@162: * Permission is hereby granted, free of charge, to any person obtaining cannam@162: * a copy of this software and associated documentation files cannam@162: * (the "Software"), to deal in the Software without restriction, cannam@162: * including without limitation the rights to use, copy, modify, merge, cannam@162: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@162: * and to permit persons to whom the Software is furnished to do so, cannam@162: * subject to the following conditions: cannam@162: * cannam@162: * The above copyright notice and this permission notice shall be cannam@162: * included in all copies or substantial portions of the Software. cannam@162: * cannam@162: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@162: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@162: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@162: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@162: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@162: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@162: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@162: */ cannam@162: cannam@162: /* cannam@162: * The text above constitutes the entire PortAudio license; however, cannam@162: * the PortAudio community also makes the following non-binding requests: cannam@162: * cannam@162: * Any person wishing to distribute modifications to the Software is cannam@162: * requested to send the modifications to the original developer so that cannam@162: * they can be incorporated into the canonical version. It is also cannam@162: * requested that these non-binding requests be included along with the cannam@162: * license above. cannam@162: */ cannam@162: cannam@162: #include cannam@162: #include cannam@162: #include "portaudio.h" cannam@162: cannam@162: #define MAX_SINES (2000) cannam@162: #define MAX_USAGE (0.5) cannam@162: #define SAMPLE_RATE (44100) cannam@162: #define FREQ_TO_PHASE_INC(freq) (freq/(float)SAMPLE_RATE) cannam@162: cannam@162: #define MIN_PHASE_INC FREQ_TO_PHASE_INC(200.0f) cannam@162: #define MAX_PHASE_INC (MIN_PHASE_INC * (1 << 5)) cannam@162: cannam@162: #define FRAMES_PER_BUFFER (512) cannam@162: #ifndef M_PI cannam@162: #define M_PI (3.14159265) cannam@162: #endif cannam@162: #define TWOPI (M_PI * 2.0) cannam@162: cannam@162: #define TABLE_SIZE (1024) cannam@162: cannam@162: typedef struct paTestData cannam@162: { cannam@162: int numSines; cannam@162: float sine[TABLE_SIZE + 1]; /* add one for guard point for interpolation */ cannam@162: float phases[MAX_SINES]; cannam@162: } cannam@162: paTestData; cannam@162: cannam@162: /* Convert phase between 0.0 and 1.0 to sine value cannam@162: * using linear interpolation. cannam@162: */ cannam@162: float LookupSine( paTestData *data, float phase ); cannam@162: float LookupSine( paTestData *data, float phase ) cannam@162: { cannam@162: float fIndex = phase*TABLE_SIZE; cannam@162: int index = (int) fIndex; cannam@162: float fract = fIndex - index; cannam@162: float lo = data->sine[index]; cannam@162: float hi = data->sine[index+1]; cannam@162: float val = lo + fract*(hi-lo); cannam@162: return val; cannam@162: } cannam@162: cannam@162: /* This routine will be called by the PortAudio engine when audio is needed. cannam@162: ** It may called at interrupt level on some machines so don't do anything cannam@162: ** that could mess up the system like calling malloc() or free(). cannam@162: */ cannam@162: static int patestCallback(const void* inputBuffer, cannam@162: void* outputBuffer, cannam@162: unsigned long framesPerBuffer, cannam@162: const PaStreamCallbackTimeInfo* timeInfo, cannam@162: PaStreamCallbackFlags statusFlags, cannam@162: void* userData ) cannam@162: { cannam@162: paTestData *data = (paTestData*)userData; cannam@162: float *out = (float*)outputBuffer; cannam@162: float outSample; cannam@162: float scaler; cannam@162: int numForScale; cannam@162: unsigned long i; cannam@162: int j; cannam@162: int finished = 0; cannam@162: (void) inputBuffer; /* Prevent unused argument warning. */ cannam@162: cannam@162: /* Determine amplitude scaling factor */ cannam@162: numForScale = data->numSines; cannam@162: if( numForScale < 8 ) numForScale = 8; /* prevent pops at beginning */ cannam@162: scaler = 1.0f / numForScale; cannam@162: cannam@162: for( i=0; inumSines; j++ ) cannam@162: { cannam@162: /* Advance phase of next oscillator. */ cannam@162: phase = data->phases[j]; cannam@162: phase += phaseInc; cannam@162: if( phase >= 1.0 ) phase -= 1.0; cannam@162: cannam@162: output += LookupSine(data, phase); cannam@162: data->phases[j] = phase; cannam@162: cannam@162: phaseInc *= 1.02f; cannam@162: if( phaseInc > MAX_PHASE_INC ) phaseInc = MIN_PHASE_INC; cannam@162: } cannam@162: cannam@162: outSample = (float) (output * scaler); cannam@162: *out++ = outSample; /* Left */ cannam@162: *out++ = outSample; /* Right */ cannam@162: } cannam@162: return finished; cannam@162: } cannam@162: cannam@162: /*******************************************************************/ cannam@162: int main(void); cannam@162: int main(void) cannam@162: { cannam@162: int i; cannam@162: PaStream* stream; cannam@162: PaStreamParameters outputParameters; cannam@162: PaError err; cannam@162: paTestData data = {0}; cannam@162: double load; cannam@162: cannam@162: printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); cannam@162: cannam@162: /* initialise sinusoidal wavetable */ cannam@162: for( i=0; idefaultHighOutputLatency; cannam@162: err = Pa_OpenStream(&stream, cannam@162: NULL, /* no input */ cannam@162: &outputParameters, cannam@162: SAMPLE_RATE, cannam@162: FRAMES_PER_BUFFER, cannam@162: paClipOff, /* No out of range samples should occur. */ cannam@162: patestCallback, cannam@162: &data); cannam@162: if( err != paNoError ) cannam@162: goto error; cannam@162: cannam@162: err = Pa_StartStream( stream ); cannam@162: if( err != paNoError ) cannam@162: goto error; cannam@162: cannam@162: /* Play an increasing number of sine waves until we hit MAX_USAGE */ cannam@162: do { cannam@162: data.numSines += 10; cannam@162: Pa_Sleep(200); cannam@162: load = Pa_GetStreamCpuLoad(stream); cannam@162: printf("numSines = %d, CPU load = %f\n", data.numSines, load ); cannam@162: fflush(stdout); cannam@162: } while((load < MAX_USAGE) && (data.numSines < MAX_SINES)); cannam@162: cannam@162: Pa_Sleep(2000); /* Stay for 2 seconds at max CPU. */ cannam@162: cannam@162: err = Pa_StopStream( stream ); cannam@162: if( err != paNoError ) cannam@162: goto error; cannam@162: cannam@162: err = Pa_CloseStream( stream ); cannam@162: if( err != paNoError ) cannam@162: goto error; cannam@162: cannam@162: Pa_Terminate(); cannam@162: printf("Test finished.\n"); cannam@162: return err; cannam@162: error: cannam@162: Pa_Terminate(); cannam@162: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@162: fprintf( stderr, "Error number: %d\n", err ); cannam@162: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@162: return err; cannam@162: }