diff src/portaudio/test/patest_leftright.c @ 4:e13257ea84a4

Add bzip2, zlib, liblo, portaudio sources

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/portaudio/test/patest_leftright.c	Wed Mar 20 13:59:52 2013 +0000
@@ -0,0 +1,185 @@
+/** @file patest_leftright.c
+	@ingroup test_src
+	@brief Play different tone sine waves that 
+		alternate between left and right channel.
+
+	The low tone should be on the left channel.
+
+	@author Ross Bencina <[e-mail]>
+	@author Phil Burk <[e-mail]>
+*/
+/*
+ * $Id: patest_leftright.c 1609 2011-02-27 00:06:07Z 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   (8)
+#define SAMPLE_RATE   (44100)
+#define FRAMES_PER_BUFFER  (512)
+#ifndef M_PI
+#define M_PI  (3.14159265)
+#endif
+#define TABLE_SIZE   (200)
+#define BALANCE_DELTA  (0.001)
+
+typedef struct
+{
+    float sine[TABLE_SIZE];
+    int left_phase;
+    int right_phase;
+    float targetBalance; // 0.0 = left, 1.0 = right
+    float currentBalance;
+} paTestData;
+
+/* 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 patestCallback( const void *inputBuffer,
+                           void *outputBuffer,
+                           unsigned long framesPerBuffer,
+                           const PaStreamCallbackTimeInfo* timeInfo,
+                           PaStreamCallbackFlags statusFlags,
+                           void *userData )
+{
+    paTestData *data = (paTestData*)userData;
+    float *out = (float*)outputBuffer;
+    unsigned long i;
+    int finished = 0;
+    /* Prevent unused variable warnings. */
+    (void) inputBuffer;
+
+    for( i=0; i<framesPerBuffer; i++ )
+    {
+		// Smoothly pan between left and right.
+		if( data->currentBalance < data->targetBalance )
+		{
+			data->currentBalance += BALANCE_DELTA;
+		}
+		else if( data->currentBalance > data->targetBalance )
+		{
+			data->currentBalance -= BALANCE_DELTA;
+		}
+		// Apply left/right balance.
+        *out++ = data->sine[data->left_phase] * (1.0f - data->currentBalance);  /* left */
+		*out++ = data->sine[data->right_phase] * data->currentBalance;  /* 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 finished;
+}
+
+/*******************************************************************/
+int main(void);
+int main(void)
+{
+    PaStream *stream;
+    PaStreamParameters outputParameters;
+    PaError err;
+    paTestData data;
+    int i;    
+    printf("Play different tone sine waves that alternate between left and right channel.\n");
+    printf("The low tone should be on the left channel.\n");
+    
+    /* initialise sinusoidal wavetable */
+    for( i=0; i<TABLE_SIZE; i++ )
+    {
+        data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
+    }
+    data.left_phase = data.right_phase = 0;
+    data.currentBalance = 0.0;
+    data.targetBalance = 0.0;
+
+    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,     /* As above. */
+                         SAMPLE_RATE,
+                         FRAMES_PER_BUFFER,
+                         paClipOff,      /* we won't output out of range samples so don't bother clipping them */
+                         patestCallback,
+                         &data );
+    if( err != paNoError ) goto error;
+    
+    err = Pa_StartStream( stream );
+    if( err != paNoError ) goto error;
+    
+    printf("Play for several seconds.\n");
+    for( i=0; i<4; i++ )
+	{
+		printf("Hear low sound on left side.\n");
+		data.targetBalance = 0.01;
+        Pa_Sleep( 1000 );
+		
+		printf("Hear high sound on right side.\n");
+		data.targetBalance = 0.99;
+        Pa_Sleep( 1000 ); 
+	}
+
+    err = Pa_StopStream( stream );
+    if( err != paNoError ) goto error;
+    err = Pa_CloseStream( stream );
+    if( err != paNoError ) goto error;
+    Pa_Terminate();
+    printf("Test finished.\n");
+    return err;
+error:
+    Pa_Terminate();
+    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 err;
+}