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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_clip.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_clip.c')
-rw-r--r--pd/portaudio/pa_tests/patest_clip.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/pd/portaudio/pa_tests/patest_clip.c b/pd/portaudio/pa_tests/patest_clip.c
new file mode 100644
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+++ b/pd/portaudio/pa_tests/patest_clip.c
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+/*
+ * $Id: patest_clip.c,v 1.1.1.1 2003-05-09 16:03:56 ggeiger Exp $
+ * patest_clip.c
+ * Play a sine wave using the Portable Audio api for several seconds
+ * at an amplitude that would require clipping.
+ *
+ * Author: Phil Burk http://www.softsynth.com
+ *
+ * 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.
+ *
+ * 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 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( void *inputBuffer, void *outputBuffer,
+ unsigned long framesPerBuffer,
+ PaTimestamp outTime, void *userData )
+{
+ paTestData *data = (paTestData*)userData;
+ float *out = (float*)outputBuffer;
+ float amplitude = data->amplitude;
+ unsigned int i;
+ (void) inputBuffer; /* Prevent "unused variable" warnings. */
+ (void) outTime;
+
+ 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 occured 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 )
+{
+ PortAudioStream *stream;
+ PaError err;
+ data->left_phase = data->right_phase = 0;
+ data->amplitude = amplitude;
+ 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 */
+ 2, /* stereo output */
+ paFloat32, /* 32 bit floating point output */
+ NULL,
+ SAMPLE_RATE,
+ 1024,
+ 0, /* number of buffers, if zero then use default minimum */
+ flags, /* we won't output out of range samples so don't bother clipping them */
+ 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_GetCPULoad( stream ) );
+ err = Pa_CloseStream( stream );
+ if( err != paNoError ) goto error;
+ Pa_Terminate();
+ return paNoError;
+error:
+ return err;
+}