comparison src/portaudio_20140130/examples/paex_write_sine.c @ 124:e3d5853d5918

Current stable PortAudio source

+/** @file paex_write_sine.c
+	@ingroup examples_src
+	@brief Play a sine wave for several seconds using the blocking API (Pa_WriteStream())
+	@author Ross Bencina <[e-mail]>
+    @author Phil Burk <[e-mail]>
+*/
+/*
+ * $Id: paex_write_sine.c 1865 2012-09-01 21:16:25Z philburk $
+ *
+ * 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   (1024)
+
+#ifndef M_PI
+#define M_PI  (3.14159265)
+#endif
+
+#define TABLE_SIZE   (200)
+
+
+int main(void);
+int main(void)
+{
+    PaStreamParameters outputParameters;
+    PaStream *stream;
+    PaError err;
+    float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */
+    float sine[TABLE_SIZE]; /* sine wavetable */
+    int left_phase = 0;
+    int right_phase = 0;
+    int left_inc = 1;
+    int right_inc = 3; /* higher pitch so we can distinguish left and right. */
+    int i, j, k;
+    int bufferCount;
+    
+    printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
+    
+    /* initialise sinusoidal wavetable */
+    for( i=0; i<TABLE_SIZE; i++ )
+    {
+        sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
+    }
+
+    
+    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 = 0.050; // Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
+    outputParameters.hostApiSpecificStreamInfo = NULL;
+
+    err = Pa_OpenStream(
+              &stream,
+              NULL, /* no input */
+              &outputParameters,
+              SAMPLE_RATE,
+              FRAMES_PER_BUFFER,
+              paClipOff,      /* we won't output out of range samples so don't bother clipping them */
+              NULL, /* no callback, use blocking API */
+              NULL ); /* no callback, so no callback userData */
+    if( err != paNoError ) goto error;
+
+
+    printf( "Play 3 times, higher each time.\n" );
+    
+    for( k=0; k < 3; ++k )
+    {
+        err = Pa_StartStream( stream );
+        if( err != paNoError ) goto error;
+
+        printf("Play for %d seconds.\n", NUM_SECONDS );
+
+        bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER);
+
+        for( i=0; i < bufferCount; i++ )
+        {
+            for( j=0; j < FRAMES_PER_BUFFER; j++ )
+            {
+                buffer[j][0] = sine[left_phase];  /* left */
+                buffer[j][1] = sine[right_phase];  /* right */
+                left_phase += left_inc;
+                if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE;
+                right_phase += right_inc;
+                if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE;
+            }
+
+            err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER );
+            if( err != paNoError ) goto error;
+        }   
+
+        err = Pa_StopStream( stream );
+        if( err != paNoError ) goto error;
+
+        ++left_inc;
+        ++right_inc;
+
+        Pa_Sleep( 1000 );
+    }
+
+    err = Pa_CloseStream( stream );
+    if( err != paNoError ) goto error;
+
+    Pa_Terminate();
+    printf("Test finished.\n");
+    
+    return err;
+
+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 ) );
+	// Print more information about the error.
+	if( err == paUnanticipatedHostError )
+	{
+		const PaHostErrorInfo *hostErrorInfo = Pa_GetLastHostErrorInfo();
+		fprintf( stderr, "Host API error = #%ld, hostApiType = %d\n", hostErrorInfo->errorCode, hostErrorInfo->hostApiType );
+		fprintf( stderr, "Host API error = %s\n", hostErrorInfo->errorText );
+	}
+    Pa_Terminate();
+    return err;
+}