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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/patest1.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/patest1.c')
-rw-r--r--pd/portaudio/pa_tests/patest1.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/pd/portaudio/pa_tests/patest1.c b/pd/portaudio/pa_tests/patest1.c
new file mode 100644
index 00000000..1f969436
--- /dev/null
+++ b/pd/portaudio/pa_tests/patest1.c
@@ -0,0 +1,119 @@
+/*
+ $Id: patest1.c,v 1.1.1.1 2003-05-09 16:03:56 ggeiger Exp $
+ patest1.c
+ Ring modulate the audio input with a sine wave for 20 seconds
+ using the Portable Audio api
+ Author: Ross Bencina <rossb@audiomulch.com>
+ Modifications:
+ April 5th, 2001 - PLB - Check for NULL inputBuffer.
+*/
+#include <stdio.h>
+#include <math.h>
+#include "portaudio.h"
+#ifndef M_PI
+#define M_PI (3.14159265)
+#endif
+typedef struct
+{
+ float sine[100];
+ int phase;
+ int sampsToGo;
+}
+patest1data;
+static int patest1Callback( void *inputBuffer, void *outputBuffer,
+ unsigned long bufferFrames,
+ PaTime outTime, void *userData )
+{
+ patest1data *data = (patest1data*)userData;
+ float *in = (float*)inputBuffer;
+ float *out = (float*)outputBuffer;
+ int framesToCalc = bufferFrames;
+ unsigned long i;
+ int finished = 0;
+ /* Check to see if any input data is available. */
+ if(inputBuffer == NULL) return 0;
+ if( data->sampsToGo < bufferFrames )
+ {
+ framesToCalc = data->sampsToGo;
+ finished = 1;
+ }
+ for( i=0; i<framesToCalc; i++ )
+ {
+ *out++ = *in++ * data->sine[data->phase]; /* left */
+ *out++ = *in++ * data->sine[data->phase++]; /* right */
+ if( data->phase >= 100 )
+ data->phase = 0;
+ }
+ data->sampsToGo -= framesToCalc;
+ /* zero remainder of final buffer if not already done */
+ for( ; i<bufferFrames; i++ )
+ {
+ *out++ = 0; /* left */
+ *out++ = 0; /* right */
+ }
+ return finished;
+}
+int main(int argc, char* argv[]);
+int main(int argc, char* argv[])
+{
+ PaStream *stream;
+ PaError err;
+ patest1data data;
+ int i;
+ int inputDevice = Pa_GetDefaultInputDevice();
+ int outputDevice = Pa_GetDefaultOutputDevice();
+ /* initialise sinusoidal wavetable */
+ for( i=0; i<100; i++ )
+ data.sine[i] = sin( ((double)i/100.) * M_PI * 2. );
+ data.phase = 0;
+ data.sampsToGo = 44100 * 20; // 20 seconds
+ /* initialise portaudio subsytem */
+ Pa_Initialize();
+ err = Pa_OpenStream(
+ &stream,
+ inputDevice,
+ 2, /* stereo input */
+ paFloat32, /* 32 bit floating point input */
+ NULL,
+ outputDevice,
+ 2, /* stereo output */
+ paFloat32, /* 32 bit floating point output */
+ NULL,
+ 44100.,
+ 512, /* small buffers */
+ 0, /* let PA determine number of buffers */
+ paClipOff, /* we won't output out of range samples so don't bother clipping them */
+ patest1Callback,
+ &data );
+ if( err == paNoError )
+ {
+ err = Pa_StartStream( stream );
+ printf( "Press any key to end.\n" );
+ getc( stdin ); //wait for input before exiting
+ Pa_AbortStream( stream );
+
+ printf( "Waiting for stream to complete...\n" );
+
+ while( Pa_IsStreamActive( stream ) )
+ Pa_Sleep(1000); /* sleep until playback has finished */
+
+ err = Pa_CloseStream( stream );
+ }
+ else
+ {
+ fprintf( stderr, "An error occured while opening the portaudio stream\n" );
+ if( err == paHostError )
+ {
+ fprintf( stderr, "Host error number: %d\n", Pa_GetHostError() );
+ }
+ else
+ {
+ fprintf( stderr, "Error number: %d\n", err );
+ fprintf( stderr, "Error text: %s\n", Pa_GetErrorText( err ) );
+ }
+ }
+ Pa_Terminate();
+ printf( "bye\n" );
+
+ return 0;
+}