--- /dev/null
+/** @file patest_sine.c
+ @ingroup test_src
+ @brief Play a sine wave for several seconds.
+ @author Ross Bencina <rossb@audiomulch.com>
+ @author Phil Burk <philburk@softsynth.com>
+*/
+/*
+ * $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 <math.h>
+#include "portaudio.h"
+
+#define NUM_SECONDS (5)
+#define SAMPLE_RATE (44100)
+#define FRAMES_PER_BUFFER (64)
+
+#ifndef M_PI
+#define M_PI (3.14159265)
+#endif
+
+#define TABLE_SIZE (200)
+typedef struct
+{
+ float sine[TABLE_SIZE];
+ int left_phase;
+ int right_phase;
+ char message[20];
+ int minFramesPerBuffer;
+ int maxFramesPerBuffer;
+}
+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;
+
+ (void) timeInfo; /* Prevent unused variable warnings. */
+ (void) statusFlags;
+ (void) inputBuffer;
+
+ if( data->minFramesPerBuffer > framesPerBuffer )
+ {
+ data->minFramesPerBuffer = framesPerBuffer;
+ }
+
+ if( data->maxFramesPerBuffer < framesPerBuffer )
+ {
+ data->maxFramesPerBuffer = framesPerBuffer;
+ }
+
+ for( i=0; i<framesPerBuffer; i++ )
+ {
+ *out++ = data->sine[data->left_phase]; /* left */
+ *out++ = data->sine[data->right_phase]; /* right */
+ data->left_phase += 1;
+ if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
+ data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
+ if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
+ }
+
+ return paContinue;
+}
+
+PaError paqaCheckLatency( PaStreamParameters *outputParamsPtr,
+ paTestData *dataPtr, double sampleRate, unsigned long framesPerBuffer )
+{
+ PaError err;
+ PaStream *stream;
+ dataPtr->minFramesPerBuffer = 9999999;
+ dataPtr->maxFramesPerBuffer = 0;
+ printf("-------------------------------------\n");
+ printf("Stream suggestedOutputLatency = %g\n", outputParamsPtr->suggestedLatency );
+ err = Pa_OpenStream(
+ &stream,
+ NULL, /* no input */
+ outputParamsPtr,
+ sampleRate,
+ framesPerBuffer,
+ paClipOff, /* we won't output out of range samples so don't bother clipping them */
+ patestCallback,
+ dataPtr );
+ if( err != paNoError ) goto error1;
+
+ err = Pa_StartStream( stream );
+ if( err != paNoError ) goto error2;
+
+ printf("Play for %d seconds.\n", NUM_SECONDS );
+ Pa_Sleep( NUM_SECONDS * 1000 );
+
+ const PaStreamInfo* streamInfo = Pa_GetStreamInfo( stream );
+ printf("Stream inputLatency = %g\n", streamInfo->inputLatency );
+ printf("Stream outputLatency = %g\n", streamInfo->outputLatency );
+ printf(" minFramesPerBuffer = %4d\n", dataPtr->minFramesPerBuffer );
+ printf(" maxFramesPerBuffer = %4d\n", dataPtr->maxFramesPerBuffer );
+
+
+ err = Pa_StopStream( stream );
+ if( err != paNoError ) goto error2;
+
+ err = Pa_CloseStream( stream );
+ Pa_Sleep( 1 * 1000 );
+
+
+ return err;
+error2:
+ Pa_CloseStream( stream );
+error1:
+ return err;
+}
+
+
+/*******************************************************************/
+int main(void);
+int main(void)
+{
+ PaStreamParameters outputParameters;
+ PaError err;
+ paTestData data;
+ const PaDeviceInfo *deviceInfo;
+ int i;
+ int framesPerBuffer;
+ double sampleRate = 44100;
+
+
+ printf("PortAudio QA: investigate output latency. 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.left_phase = data.right_phase = 0;
+
+ 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 */
+ deviceInfo = Pa_GetDeviceInfo( outputParameters.device );
+ printf("defaultLowOutputLatency = %f seconds\n", deviceInfo->defaultLowOutputLatency);
+ printf("defaultHighOutputLatency = %f seconds\n", deviceInfo->defaultHighOutputLatency);
+ outputParameters.hostApiSpecificStreamInfo = NULL;
+
+ // Try to use a small buffer that is smaller than we think the device can handle.
+ // Try to force combining multiple user buffers into a host buffer.
+ framesPerBuffer = 8;
+ outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency;
+ err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer );
+ if( err != paNoError ) goto error;
+
+ // Try to create a huge buffer that is bigger than the allowed device maximum.
+ framesPerBuffer = 16*1024;
+ outputParameters.suggestedLatency = ((double)framesPerBuffer) / sampleRate; // approximate
+ err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer );
+ if( err != paNoError ) goto error;
+
+ outputParameters.suggestedLatency = 0.0;
+ err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
+ if( err != paNoError ) goto error;
+
+ outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency;
+ err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
+ if( err != paNoError ) goto error;
+
+ outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency;
+ err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
+ if( err != paNoError ) goto error;
+
+ outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency * 4;
+ err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
+ 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;
+}
projects / portaudio / commitdiff