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+/** @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>
+*/
+/*
+ * $Id$
+ *
+ * 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 (2000)
+#define MAX_USAGE (0.5)
+#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 (1024)
+
+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 0.0 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. */
+ if (outputParameters.device == paNoDevice) {
+ fprintf(stderr,"Error: No default output device.\n");
+ goto error;
+ }
+ 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 += 10;
+ 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 at max 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 occurred while using the portaudio stream\n" );
+ fprintf( stderr, "Error number: %d\n", err );
+ fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
+ return err;
+}