diff src/portaudio/test/patest_suggested_vs_streaminfo_latency.c @ 89:8a15ff55d9af

Add bzip2, zlib, liblo, portaudio sources

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/portaudio/test/patest_suggested_vs_streaminfo_latency.c	Wed Mar 20 13:59:52 2013 +0000
@@ -0,0 +1,269 @@
+/** @file patest_suggested_vs_streaminfo_latency.c
+	@ingroup test_src
+	@brief Print suggested vs. PaStreamInfo reported actual latency
+	@author Ross Bencina <[e-mail]>
+
+	Opens streams with a sequence of suggested latency values 
+	from 0 to 2 seconds in .5ms intervals and gathers the resulting actual 
+	latency values. Output a csv file and graph suggested vs. actual. Run 
+	with framesPerBuffer unspecified, powers of 2 and multiples of 50 and 
+	prime number buffer sizes.
+*/
+/*
+ * $Id: patest_sine.c 1368 2008-03-01 00:38:27Z rossb $
+ *
+ * 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 <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include "portaudio.h"
+
+#define SAMPLE_RATE             (44100)
+#define FRAMES_PER_BUFFER       2//(128)
+#define NUM_CHANNELS            (2)
+
+#define SUGGESTED_LATENCY_START_SECONDS     (0.0)
+#define SUGGESTED_LATENCY_END_SECONDS       (2.0)
+#define SUGGESTED_LATENCY_INCREMENT_SECONDS (0.0005) /* half a millisecond increments */
+
+
+/* dummy callback. does nothing. never gets called */
+static int patestCallback( const void *inputBuffer, void *outputBuffer,
+                            unsigned long framesPerBuffer,
+                            const PaStreamCallbackTimeInfo* timeInfo,
+                            PaStreamCallbackFlags statusFlags,
+                            void *userData )
+{
+    return paContinue;
+}
+
+/*******************************************************************/
+static void usage()
+{
+    int i;
+    const PaDeviceInfo *deviceInfo;
+    const char *channelString;
+
+    fprintf( stderr, "PortAudio suggested (requested) vs. resulting (reported) stream latency test\n" );
+    fprintf( stderr, "Usage: x.exe input-device-index output-device-index sample-rate frames-per-buffer\n" );
+    fprintf( stderr, "Use -1 for default device index, or use one of these:\n" );
+    for( i=0; i < Pa_GetDeviceCount(); ++i ){
+        deviceInfo = Pa_GetDeviceInfo(i);
+        if( deviceInfo->maxInputChannels > 0 && deviceInfo->maxOutputChannels > 0 )
+            channelString = "full-duplex";
+        else if( deviceInfo->maxInputChannels > 0 )
+            channelString = "input only";
+        else
+            channelString = "output only";
+
+        fprintf( stderr, "%d (%s, %s, %s)\n", i, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name, channelString );
+    }
+    Pa_Terminate();
+    exit(-1);
+}
+
+int main( int argc, const char* argv[] );
+int main( int argc, const char* argv[] )
+{
+    PaStreamParameters inputParameters, outputParameters;
+    PaStream *stream;
+    PaError err;
+    PaTime suggestedLatency;
+    const PaStreamInfo *streamInfo;
+    const PaDeviceInfo *deviceInfo;
+    float sampleRate = SAMPLE_RATE;
+    int framesPerBuffer = FRAMES_PER_BUFFER;
+    err = Pa_Initialize();
+    if( err != paNoError ) goto error;
+
+    if( argc > 1 && strcmp(argv[1],"-h") == 0 )
+        usage();
+
+    if( argc > 3 ){
+        sampleRate = atoi(argv[3]);
+    }
+
+    if( argc > 4 ){
+        framesPerBuffer = atoi(argv[4]);
+    }
+
+    printf("# sample rate=%f, frames per buffer=%d\n", (float)sampleRate, framesPerBuffer );
+
+    inputParameters.device = -1;
+    if( argc > 1 )
+        inputParameters.device = atoi(argv[1]);
+    if( inputParameters.device == -1 ){
+        inputParameters.device = Pa_GetDefaultInputDevice();
+        if (inputParameters.device == paNoDevice) {
+          fprintf(stderr,"Error: No default input device available.\n");
+          goto error;
+        }
+    }else{
+        deviceInfo = Pa_GetDeviceInfo(inputParameters.device);
+        if( !deviceInfo ){
+            fprintf(stderr,"Error: Invalid input device index.\n");
+            usage();
+        }
+        if( deviceInfo->maxInputChannels == 0 ){
+            fprintf(stderr,"Error: Specified input device has no input channels (an output only device?).\n");
+            usage();
+        }
+    }
+    
+    inputParameters.channelCount = NUM_CHANNELS;
+    inputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
+    inputParameters.hostApiSpecificStreamInfo = NULL;
+
+    deviceInfo = Pa_GetDeviceInfo(inputParameters.device);
+    printf( "# using input device id %d (%s, %s)\n", inputParameters.device, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name );
+
+
+    outputParameters.device = -1;
+    if( argc > 2 )
+        outputParameters.device = atoi(argv[2]);
+    if( outputParameters.device == -1 ){
+        outputParameters.device = Pa_GetDefaultOutputDevice();
+        if (outputParameters.device == paNoDevice) {
+          fprintf(stderr,"Error: No default output device available.\n");
+          goto error;
+        }
+    }else{
+        deviceInfo = Pa_GetDeviceInfo(outputParameters.device);
+        if( !deviceInfo ){
+            fprintf(stderr,"Error: Invalid output device index.\n");
+            usage();
+        }
+        if( deviceInfo->maxOutputChannels == 0 ){
+            fprintf(stderr,"Error: Specified output device has no output channels (an input only device?).\n");
+            usage();
+        }
+    }
+
+    outputParameters.channelCount = NUM_CHANNELS;
+    outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
+    outputParameters.hostApiSpecificStreamInfo = NULL;
+
+    deviceInfo = Pa_GetDeviceInfo(outputParameters.device);
+    printf( "# using output device id %d (%s, %s)\n", outputParameters.device, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name );
+
+
+    printf( "# suggested latency, half duplex PaStreamInfo::outputLatency, half duplex PaStreamInfo::inputLatency, full duplex PaStreamInfo::outputLatency, full duplex PaStreamInfo::inputLatency\n" );
+    suggestedLatency = SUGGESTED_LATENCY_START_SECONDS;
+    while( suggestedLatency <= SUGGESTED_LATENCY_END_SECONDS ){
+
+        outputParameters.suggestedLatency = suggestedLatency;
+        inputParameters.suggestedLatency = suggestedLatency;
+
+        printf( "%f, ", suggestedLatency );
+
+        /* ------------------------------ output ------------------------------ */
+
+        err = Pa_OpenStream(
+                  &stream,
+                  NULL, /* no input */
+                  &outputParameters,
+                  sampleRate,
+                  framesPerBuffer,
+                  paClipOff,      /* we won't output out of range samples so don't bother clipping them */
+                  patestCallback,
+                  0 );
+        if( err != paNoError ) goto error;
+
+        streamInfo = Pa_GetStreamInfo( stream );
+
+        printf( "%f,", streamInfo->outputLatency  );
+
+        err = Pa_CloseStream( stream );
+        if( err != paNoError ) goto error;
+
+        /* ------------------------------ input ------------------------------ */
+
+        err = Pa_OpenStream(
+                  &stream,
+                  &inputParameters, 
+                  NULL, /* no output */
+                  sampleRate,
+                  framesPerBuffer,
+                  paClipOff,      /* we won't output out of range samples so don't bother clipping them */
+                  patestCallback,
+                  0 );
+        if( err != paNoError ) goto error;
+
+        streamInfo = Pa_GetStreamInfo( stream );
+
+        printf( "%f,", streamInfo->inputLatency  );
+
+        err = Pa_CloseStream( stream );
+        if( err != paNoError ) goto error;
+
+        /* ------------------------------ full duplex ------------------------------ */
+
+        err = Pa_OpenStream(
+                  &stream,
+                  &inputParameters, 
+                  &outputParameters,
+                  sampleRate,
+                  framesPerBuffer,
+                  paClipOff,      /* we won't output out of range samples so don't bother clipping them */
+                  patestCallback,
+                  0 );
+        if( err != paNoError ) goto error;
+
+        streamInfo = Pa_GetStreamInfo( stream );
+
+        printf( "%f,%f", streamInfo->outputLatency, streamInfo->inputLatency );
+
+        err = Pa_CloseStream( stream );
+        if( err != paNoError ) goto error;
+
+        /* ------------------------------------------------------------ */
+
+        printf( "\n" );
+        suggestedLatency += SUGGESTED_LATENCY_INCREMENT_SECONDS;
+    }
+
+    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;
+}