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authorsanine <sanine.not@pm.me>2022-08-27 23:52:56 -0500
committersanine <sanine.not@pm.me>2022-08-27 23:52:56 -0500
commita4dd0ad63c00f4dee3b86dfd3075d1d61b2b3180 (patch)
tree13bd5bfa15e6fea2a12f176bae79adf9c6fd0933 /3rdparty/portaudio/test/patest_clip.c
parentbde3e4f1bb7b8f8abca0884a7d994ee1c17a66b1 (diff)
add plibsys
Diffstat (limited to '3rdparty/portaudio/test/patest_clip.c')
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diff --git a/3rdparty/portaudio/test/patest_clip.c b/3rdparty/portaudio/test/patest_clip.c
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+/** @file patest_clip.c
+ @ingroup test_src
+ @brief Play a sine wave for several seconds at an amplitude
+ that would require clipping.
+
+ @author Phil Burk http://www.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 NUM_SECONDS (4)
+#define SAMPLE_RATE (44100)
+#ifndef M_PI
+#define M_PI (3.14159265)
+#endif
+#define TABLE_SIZE (200)
+
+typedef struct paTestData
+{
+ float sine[TABLE_SIZE];
+ float amplitude;
+ int left_phase;
+ int right_phase;
+}
+paTestData;
+
+PaError PlaySine( paTestData *data, unsigned long flags, float amplitude );
+
+/* 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 sineCallback( const void *inputBuffer, void *outputBuffer,
+ unsigned long framesPerBuffer,
+ const PaStreamCallbackTimeInfo* timeInfo,
+ PaStreamCallbackFlags statusFlags,
+ void *userData )
+{
+ paTestData *data = (paTestData*)userData;
+ float *out = (float*)outputBuffer;
+ float amplitude = data->amplitude;
+ unsigned int i;
+ (void) inputBuffer; /* Prevent "unused variable" warnings. */
+ (void) timeInfo;
+ (void) statusFlags;
+
+ for( i=0; i<framesPerBuffer; i++ )
+ {
+ *out++ = amplitude * data->sine[data->left_phase]; /* left */
+ *out++ = amplitude * 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 0;
+}
+/*******************************************************************/
+int main(void);
+int main(void)
+{
+ PaError err;
+ paTestData data;
+ int i;
+
+ printf("PortAudio Test: output sine wave with and without clipping.\n");
+ /* initialise sinusoidal wavetable */
+ for( i=0; i<TABLE_SIZE; i++ )
+ {
+ data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
+ }
+
+ printf("\nHalf amplitude. Should sound like sine wave.\n"); fflush(stdout);
+ err = PlaySine( &data, paClipOff | paDitherOff, 0.5f );
+ if( err < 0 ) goto error;
+
+ printf("\nFull amplitude. Should sound like sine wave.\n"); fflush(stdout);
+ err = PlaySine( &data, paClipOff | paDitherOff, 0.999f );
+ if( err < 0 ) goto error;
+
+ printf("\nOver range with clipping and dithering turned OFF. Should sound very nasty.\n");
+ fflush(stdout);
+ err = PlaySine( &data, paClipOff | paDitherOff, 1.1f );
+ if( err < 0 ) goto error;
+
+ printf("\nOver range with clipping and dithering turned ON. Should sound smoother than previous.\n");
+ fflush(stdout);
+ err = PlaySine( &data, paNoFlag, 1.1f );
+ if( err < 0 ) goto error;
+
+ printf("\nOver range with paClipOff but dithering ON.\n"
+ "That forces clipping ON so it should sound the same as previous.\n");
+ fflush(stdout);
+ err = PlaySine( &data, paClipOff, 1.1f );
+ if( err < 0 ) goto error;
+
+ return 0;
+error:
+ 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 1;
+}
+/*****************************************************************************/
+PaError PlaySine( paTestData *data, unsigned long flags, float amplitude )
+{
+ PaStreamParameters outputParameters;
+ PaStream *stream;
+ PaError err;
+
+ data->left_phase = data->right_phase = 0;
+ data->amplitude = amplitude;
+
+ 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.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
+ outputParameters.hostApiSpecificStreamInfo = NULL;
+
+ err = Pa_OpenStream(
+ &stream,
+ NULL, /* no input */
+ &outputParameters,
+ SAMPLE_RATE,
+ 1024,
+ flags,
+ sineCallback,
+ data );
+ if( err != paNoError ) goto error;
+
+ err = Pa_StartStream( stream );
+ if( err != paNoError ) goto error;
+
+ Pa_Sleep( NUM_SECONDS * 1000 );
+ printf("CPULoad = %8.6f\n", Pa_GetStreamCpuLoad( stream ) );
+
+ err = Pa_CloseStream( stream );
+ if( err != paNoError ) goto error;
+
+ Pa_Terminate();
+ return paNoError;
+error:
+ return err;
+}