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authorGuenter Geiger <ggeiger@users.sourceforge.net>2003-05-09 16:04:00 +0000
committerGuenter Geiger <ggeiger@users.sourceforge.net>2003-05-09 16:04:00 +0000
commit9c0e19a3be2288db79e2502e5fa450c3e20a668d (patch)
treeca97ce615e037a533304fc4660dcf372ca3b9cd6 /pd/portaudio/pa_tests/patest_toomanysines.c
parentef50dd62804d54af7da18d8bd8413c0dccd729b8 (diff)
This commit was generated by cvs2svn to compensate for changes in r610,
which included commits to RCS files with non-trunk default branches. svn path=/trunk/; revision=611
Diffstat (limited to 'pd/portaudio/pa_tests/patest_toomanysines.c')
-rw-r--r--pd/portaudio/pa_tests/patest_toomanysines.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/pd/portaudio/pa_tests/patest_toomanysines.c b/pd/portaudio/pa_tests/patest_toomanysines.c
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+/*
+ * $Id: patest_toomanysines.c,v 1.1.1.1 2003-05-09 16:03:56 ggeiger Exp $
+ * Play more sine waves than we can handle in real time as a stress test,
+ *
+ * Authors:
+ * Ross Bencina <rossb@audiomulch.com>
+ * Phil Burk <philburk@softsynth.com>
+ *
+ * This program uses the PortAudio Portable Audio Library.
+ * For more information see: http://www.audiomulch.com/portaudio/
+ * 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.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ */
+#include <stdio.h>
+#include <math.h>
+#include "portaudio.h"
+
+#define MAX_SINES (500)
+#define MAX_LOAD (1.2)
+#define SAMPLE_RATE (44100)
+#define FRAMES_PER_BUFFER (512)
+#ifndef M_PI
+#define M_PI (3.14159265)
+#endif
+#define TWOPI (M_PI * 2.0)
+
+typedef struct paTestData
+{
+ int numSines;
+ double phases[MAX_SINES];
+}
+paTestData;
+
+/* 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( void *inputBuffer, void *outputBuffer,
+ unsigned long framesPerBuffer,
+ PaTimestamp outTime, void *userData )
+{
+ paTestData *data = (paTestData*)userData;
+ float *out = (float*)outputBuffer;
+ unsigned long i;
+ int j;
+ int finished = 0;
+ (void) outTime; /* Prevent unused variable warnings. */
+ (void) inputBuffer;
+
+ for( i=0; i<framesPerBuffer; i++ )
+ {
+ float output = 0.0;
+ double phaseInc = 0.02;
+ double phase;
+ for( j=0; j<data->numSines; j++ )
+ {
+ /* Advance phase of next oscillator. */
+ phase = data->phases[j];
+ phase += phaseInc;
+ if( phase > TWOPI ) phase -= TWOPI;
+
+ phaseInc *= 1.02;
+ if( phaseInc > 0.5 ) phaseInc *= 0.5;
+
+ /* This is not a very efficient way to calc sines. */
+ output += (float) sin( phase );
+ data->phases[j] = phase;
+ }
+
+
+ *out++ = (float) (output / data->numSines);
+ }
+ return finished;
+}
+
+/*******************************************************************/
+int main(void);
+int main(void)
+{
+ PortAudioStream *stream;
+ PaError err;
+ int numStress;
+ paTestData data = {0};
+ double load;
+ printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d. MAX_LOAD = %f\n",
+ SAMPLE_RATE, FRAMES_PER_BUFFER, MAX_LOAD );
+
+ err = Pa_Initialize();
+ if( err != paNoError ) goto error;
+ err = Pa_OpenStream(
+ &stream,
+ paNoDevice,/* default input device */
+ 0, /* no input */
+ paFloat32, /* 32 bit floating point input */
+ NULL,
+ Pa_GetDefaultOutputDeviceID(), /* default output device */
+ 1, /* mono output */
+ paFloat32, /* 32 bit floating point output */
+ NULL,
+ SAMPLE_RATE,
+ FRAMES_PER_BUFFER, /* frames per buffer */
+ 0, /* number of buffers, if zero then use default minimum */
+ paClipOff, /* we won't output out of range samples so don't bother clipping them */
+ patestCallback,
+ &data );
+ if( err != paNoError ) goto error;
+ err = Pa_StartStream( stream );
+ if( err != paNoError ) goto error;
+
+ /* Determine number of sines required to get to 50% */
+ do
+ {
+ data.numSines++;
+ Pa_Sleep( 100 );
+
+ load = Pa_GetCPULoad( stream );
+ printf("numSines = %d, CPU load = %f\n", data.numSines, load );
+ }
+ while( load < 0.5 );
+
+ /* Calculate target stress value then ramp up to that level*/
+ numStress = (int) (2.0 * data.numSines * MAX_LOAD );
+ for( ; data.numSines < numStress; data.numSines++ )
+ {
+ Pa_Sleep( 200 );
+ load = Pa_GetCPULoad( stream );
+ printf("STRESSING: numSines = %d, CPU load = %f\n", data.numSines, load );
+ }
+
+ printf("Suffer for 5 seconds.\n");
+ Pa_Sleep( 5000 );
+
+ printf("Stop stream.\n");
+ 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;
+}