comparison src/portaudio/test/patest_out_underflow.c @ 4:e13257ea84a4

Add bzip2, zlib, liblo, portaudio sources

+/** @file patest_out_underflow.c
+	@ingroup test_src
+	@brief Count output underflows (using paOutputUnderflow flag) 
+	under overloaded and normal conditions.
+	@author Ross Bencina <[e-mail]>
+	@author Phil Burk <[e-mail]>
+*/
+/*
+ * $Id: patest_out_underflow.c 1609 2011-02-27 00:06:07Z philburk $
+ *
+ * This program uses the PortAudio Portable Audio Library.
+ * For more information see: http://www.portaudio.com
+ * Copyright (c) 1999-2004 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     (1000)
+#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 sineCount;
+    double phases[MAX_SINES];
+    int countUnderflows;
+    int outputUnderflowCount;
+}
+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( const void *inputBuffer, void *outputBuffer,
+                           unsigned long framesPerBuffer,
+                           const PaStreamCallbackTimeInfo* timeInfo,
+                           PaStreamCallbackFlags statusFlags,
+                           void *userData )
+{
+    paTestData *data = (paTestData*)userData;
+    float *out = (float*)outputBuffer;
+    unsigned long i;
+    int j;
+    int finished = paContinue;
+    (void) timeInfo;    /* Prevent unused variable warning. */
+    (void) inputBuffer; /* Prevent unused variable warning. */
+
+
+    if( data->countUnderflows && (statusFlags & paOutputUnderflow) )
+        data->outputUnderflowCount++;
+
+    for( i=0; i<framesPerBuffer; i++ )
+    {
+        float output = 0.0;
+        double phaseInc = 0.02;
+        double phase;
+
+        for( j=0; j<data->sineCount; 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->sineCount);
+    }
+
+    return finished;
+}
+
+/*******************************************************************/
+int main(void);
+int main(void)
+{
+    PaStreamParameters outputParameters;
+    PaStream *stream;
+    PaError err;
+    int safeSineCount, stressedSineCount;
+    int safeUnderflowCount, stressedUnderflowCount;
+    paTestData data = {0};
+    double load;
+
+
+    printf("PortAudio Test: output sine waves, count underflows. SR = %d, BufSize = %d. MAX_LOAD = %f\n",
+        SAMPLE_RATE, FRAMES_PER_BUFFER, (float)MAX_LOAD );
+
+    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 = 1;                      /* mono output */
+    outputParameters.sampleFormat = paFloat32;              /* 32 bit floating point output */
+    outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
+    outputParameters.hostApiSpecificStreamInfo = NULL;
+
+    err = Pa_OpenStream(
+              &stream,
+              NULL,         /* no input */
+              &outputParameters,
+              SAMPLE_RATE,
+              FRAMES_PER_BUFFER,
+              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;
+
+    printf("Establishing load conditions...\n" );
+
+    /* Determine number of sines required to get to 50% */
+    do
+    {        
+		Pa_Sleep( 100 );
+
+        load = Pa_GetStreamCpuLoad( stream );
+        printf("sineCount = %d, CPU load = %f\n", data.sineCount, load );
+		
+		if( load < 0.3 )
+		{
+			data.sineCount += 10;
+		}
+		else if( load < 0.4 )
+		{
+			data.sineCount += 2;
+		}
+		else
+		{
+			data.sineCount += 1;
+		}
+		
+    }
+    while( load < 0.5 && data.sineCount < (MAX_SINES-1));
+
+    safeSineCount = data.sineCount;
+
+    /* Calculate target stress value then ramp up to that level*/
+    stressedSineCount = (int) (2.0 * data.sineCount * MAX_LOAD );
+    if( stressedSineCount > MAX_SINES )
+        stressedSineCount = MAX_SINES;
+    for( ; data.sineCount < stressedSineCount; data.sineCount+=4 )
+    {
+        Pa_Sleep( 100 );
+        load = Pa_GetStreamCpuLoad( stream );
+        printf("STRESSING: sineCount = %d, CPU load = %f\n", data.sineCount, load );
+    }
+    
+    printf("Counting underflows for 5 seconds.\n");
+    data.countUnderflows = 1;
+    Pa_Sleep( 5000 );
+
+    stressedUnderflowCount = data.outputUnderflowCount;
+
+    data.countUnderflows = 0;
+    data.sineCount = safeSineCount;
+
+    printf("Resuming safe load...\n");
+    Pa_Sleep( 1500 );
+    data.outputUnderflowCount = 0;
+    Pa_Sleep( 1500 );
+    load = Pa_GetStreamCpuLoad( stream );
+    printf("sineCount = %d, CPU load = %f\n", data.sineCount, load );
+
+    printf("Counting underflows for 5 seconds.\n");
+    data.countUnderflows = 1;
+    Pa_Sleep( 5000 );
+
+    safeUnderflowCount = data.outputUnderflowCount;
+    
+    printf("Stop stream.\n");
+    err = Pa_StopStream( stream );
+    if( err != paNoError ) goto error;
+    
+    err = Pa_CloseStream( stream );
+    if( err != paNoError ) goto error;
+    
+    Pa_Terminate();
+
+    if( stressedUnderflowCount == 0 )
+        printf("Test failed, no output underflows detected under stress.\n");
+    else if( safeUnderflowCount != 0 )
+        printf("Test failed, %d unexpected underflows detected under safe load.\n", safeUnderflowCount);
+    else
+        printf("Test passed, %d expected output underflows detected under stress, 0 unexpected underflows detected under safe load.\n", stressedUnderflowCount );
+
+    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;
+}