Init

2025-11-24 14:19:51 +05:30
commit f5c1412b28
6734 changed files with 1527575 additions and 0 deletions
--- a/DependentExtensions/portaudio_v18_1/pa_tests/patest1.c
+++ b/DependentExtensions/portaudio_v18_1/pa_tests/patest1.c
@ -0,0 +1,114 @@
+/*
+ $Id: patest1.c,v 1.1.1.1 2002/01/22 00:52:33 phil 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,
+                            PaTimestamp 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_GetDefaultInputDeviceID();
+    int outputDevice = Pa_GetDefaultOutputDeviceID();
+    /* 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_StreamActive( 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 );
+    }
+    Pa_Terminate();
+    printf( "bye\n" );
+
+    return 0;
+}