paex_write_sine_nonint.c (5726B)
1 /** @file paex_write_sine_nonint.c 2 @ingroup examples_src 3 @brief Play a non-interleaved sine wave using the blocking API (Pa_WriteStream()) 4 @author Ross Bencina <rossb@audiomulch.com> 5 @author Phil Burk <philburk@softsynth.com> 6 */ 7 /* 8 * $Id: patest_write_sine.c 1368 2008-03-01 00:38:27Z rossb $ 9 * 10 * This program uses the PortAudio Portable Audio Library. 11 * For more information see: http://www.portaudio.com/ 12 * Copyright (c) 1999-2000 Ross Bencina and Phil Burk 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining 15 * a copy of this software and associated documentation files 16 * (the "Software"), to deal in the Software without restriction, 17 * including without limitation the rights to use, copy, modify, merge, 18 * publish, distribute, sublicense, and/or sell copies of the Software, 19 * and to permit persons to whom the Software is furnished to do so, 20 * subject to the following conditions: 21 * 22 * The above copyright notice and this permission notice shall be 23 * included in all copies or substantial portions of the Software. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 28 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR 29 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 30 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 31 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 32 */ 33 34 /* 35 * The text above constitutes the entire PortAudio license; however, 36 * the PortAudio community also makes the following non-binding requests: 37 * 38 * Any person wishing to distribute modifications to the Software is 39 * requested to send the modifications to the original developer so that 40 * they can be incorporated into the canonical version. It is also 41 * requested that these non-binding requests be included along with the 42 * license above. 43 */ 44 45 #include <stdio.h> 46 #include <math.h> 47 #include "portaudio.h" 48 49 #define NUM_SECONDS (5) 50 #define SAMPLE_RATE (44100) 51 #define FRAMES_PER_BUFFER (1024) 52 53 #ifndef M_PI 54 #define M_PI (3.14159265) 55 #endif 56 57 #define TABLE_SIZE (200) 58 59 60 int main(void); 61 int main(void) 62 { 63 PaStreamParameters outputParameters; 64 PaStream *stream; 65 PaError err; 66 67 float leftBuffer[FRAMES_PER_BUFFER]; 68 float rightBuffer[FRAMES_PER_BUFFER]; 69 void *buffers[2]; /* points to both non-interleaved buffers. */ 70 71 float sine[TABLE_SIZE]; /* sine wavetable */ 72 int left_phase = 0; 73 int right_phase = 0; 74 int left_inc = 1; 75 int right_inc = 3; /* higher pitch so we can distinguish left and right. */ 76 int i, j, k; 77 int bufferCount; 78 79 80 printf("PortAudio Test: output sine wave NON-INTERLEAVED. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); 81 82 /* initialise sinusoidal wavetable */ 83 for( i=0; i<TABLE_SIZE; i++ ) 84 { 85 sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); 86 } 87 88 89 err = Pa_Initialize(); 90 if( err != paNoError ) goto error; 91 92 outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ 93 if (outputParameters.device == paNoDevice) { 94 fprintf(stderr,"Error: No default output device.\n"); 95 goto error; 96 } 97 outputParameters.channelCount = 2; /* stereo output */ 98 outputParameters.sampleFormat = paFloat32 | paNonInterleaved; /* 32 bit floating point output NON-INTERLEAVED */ 99 outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; 100 outputParameters.hostApiSpecificStreamInfo = NULL; 101 102 err = Pa_OpenStream( 103 &stream, 104 NULL, /* no input */ 105 &outputParameters, 106 SAMPLE_RATE, 107 FRAMES_PER_BUFFER, 108 paClipOff, /* we won't output out of range samples so don't bother clipping them */ 109 NULL, /* no callback, use blocking API */ 110 NULL ); /* no callback, so no callback userData */ 111 if( err != paNoError ) goto error; 112 113 114 printf( "Play 3 times, higher each time.\n" ); 115 116 /* Set up array of buffer pointers for Pa_WriteStream */ 117 buffers[0] = leftBuffer; 118 buffers[1] = rightBuffer; 119 120 for( k=0; k < 3; ++k ) 121 { 122 err = Pa_StartStream( stream ); 123 if( err != paNoError ) goto error; 124 125 printf("Play for %d seconds.\n", NUM_SECONDS ); 126 127 bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER); 128 129 for( i=0; i < bufferCount; i++ ) 130 { 131 for( j=0; j < FRAMES_PER_BUFFER; j++ ) 132 { 133 leftBuffer[j] = sine[left_phase]; /* left */ 134 rightBuffer[j] = sine[right_phase]; /* right */ 135 left_phase += left_inc; 136 if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE; 137 right_phase += right_inc; 138 if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE; 139 } 140 141 err = Pa_WriteStream( stream, buffers, FRAMES_PER_BUFFER ); 142 if( err != paNoError ) goto error; 143 } 144 145 err = Pa_StopStream( stream ); 146 if( err != paNoError ) goto error; 147 148 ++left_inc; 149 ++right_inc; 150 151 Pa_Sleep( 1000 ); 152 } 153 154 err = Pa_CloseStream( stream ); 155 if( err != paNoError ) goto error; 156 157 Pa_Terminate(); 158 printf("Test finished.\n"); 159 160 return err; 161 error: 162 Pa_Terminate(); 163 fprintf( stderr, "An error occured while using the portaudio stream\n" ); 164 fprintf( stderr, "Error number: %d\n", err ); 165 fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); 166 return err; 167 }