paex_mono_asio_channel_select.c (5913B)
1 /** @file paex_mono_asio_channel_select.c 2 @ingroup examples_src 3 @brief Play a monophonic sine wave on a specific ASIO channel. 4 @author Ross Bencina <rossb@audiomulch.com> 5 @author Phil Burk <philburk@softsynth.com> 6 */ 7 /* 8 * $Id$ 9 * 10 * Authors: 11 * Ross Bencina <rossb@audiomulch.com> 12 * Phil Burk <philburk@softsynth.com> 13 * 14 * This program uses the PortAudio Portable Audio Library. 15 * For more information see: http://www.portaudio.com 16 * Copyright (c) 1999-2000 Ross Bencina and Phil Burk 17 * 18 * Permission is hereby granted, free of charge, to any person obtaining 19 * a copy of this software and associated documentation files 20 * (the "Software"), to deal in the Software without restriction, 21 * including without limitation the rights to use, copy, modify, merge, 22 * publish, distribute, sublicense, and/or sell copies of the Software, 23 * and to permit persons to whom the Software is furnished to do so, 24 * subject to the following conditions: 25 * 26 * The above copyright notice and this permission notice shall be 27 * included in all copies or substantial portions of the Software. 28 * 29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 30 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 32 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR 33 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 34 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 35 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 36 */ 37 38 /* 39 * The text above constitutes the entire PortAudio license; however, 40 * the PortAudio community also makes the following non-binding requests: 41 * 42 * Any person wishing to distribute modifications to the Software is 43 * requested to send the modifications to the original developer so that 44 * they can be incorporated into the canonical version. It is also 45 * requested that these non-binding requests be included along with the 46 * license above. 47 */ 48 49 #include <stdio.h> 50 #include <math.h> 51 #include "portaudio.h" 52 #include "pa_asio.h" 53 54 #define NUM_SECONDS (10) 55 #define SAMPLE_RATE (44100) 56 #define AMPLITUDE (0.8) 57 #define FRAMES_PER_BUFFER (64) 58 #define OUTPUT_DEVICE Pa_GetDefaultOutputDevice() 59 60 #ifndef M_PI 61 #define M_PI (3.14159265) 62 #endif 63 64 #define TABLE_SIZE (200) 65 typedef struct 66 { 67 float sine[TABLE_SIZE]; 68 int phase; 69 } 70 paTestData; 71 72 /* This routine will be called by the PortAudio engine when audio is needed. 73 ** It may called at interrupt level on some machines so don't do anything 74 ** that could mess up the system like calling malloc() or free(). 75 */ 76 static int patestCallback( const void *inputBuffer, void *outputBuffer, 77 unsigned long framesPerBuffer, 78 const PaStreamCallbackTimeInfo* timeInfo, 79 PaStreamCallbackFlags statusFlags, 80 void *userData ) 81 { 82 paTestData *data = (paTestData*)userData; 83 float *out = (float*)outputBuffer; 84 unsigned long i; 85 int finished = 0; 86 /* avoid unused variable warnings */ 87 (void) inputBuffer; 88 (void) timeInfo; 89 (void) statusFlags; 90 for( i=0; i<framesPerBuffer; i++ ) 91 { 92 *out++ = data->sine[data->phase]; /* left */ 93 data->phase += 1; 94 if( data->phase >= TABLE_SIZE ) data->phase -= TABLE_SIZE; 95 } 96 return finished; 97 } 98 99 /*******************************************************************/ 100 int main(void); 101 int main(void) 102 { 103 PaStreamParameters outputParameters; 104 PaAsioStreamInfo asioOutputInfo; 105 PaStream *stream; 106 PaError err; 107 paTestData data; 108 int outputChannelSelectors[1]; 109 int i; 110 printf("PortAudio Test: output MONO sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); 111 /* initialise sinusoidal wavetable */ 112 for( i=0; i<TABLE_SIZE; i++ ) 113 { 114 data.sine[i] = (float) (AMPLITUDE * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. )); 115 } 116 data.phase = 0; 117 118 err = Pa_Initialize(); 119 if( err != paNoError ) goto error; 120 121 outputParameters.device = OUTPUT_DEVICE; 122 outputParameters.channelCount = 1; /* MONO output */ 123 outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ 124 outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; 125 126 /* Use an ASIO specific structure. WARNING - this is not portable. */ 127 asioOutputInfo.size = sizeof(PaAsioStreamInfo); 128 asioOutputInfo.hostApiType = paASIO; 129 asioOutputInfo.version = 1; 130 asioOutputInfo.flags = paAsioUseChannelSelectors; 131 outputChannelSelectors[0] = 1; /* skip channel 0 and use the second (right) ASIO device channel */ 132 asioOutputInfo.channelSelectors = outputChannelSelectors; 133 outputParameters.hostApiSpecificStreamInfo = &asioOutputInfo; 134 135 err = Pa_OpenStream( 136 &stream, 137 NULL, /* no input */ 138 &outputParameters, 139 SAMPLE_RATE, 140 FRAMES_PER_BUFFER, 141 paClipOff, /* we won't output out of range samples so don't bother clipping them */ 142 patestCallback, 143 &data ); 144 if( err != paNoError ) goto error; 145 146 err = Pa_StartStream( stream ); 147 if( err != paNoError ) goto error; 148 149 printf("Play for %d seconds.\n", NUM_SECONDS ); fflush(stdout); 150 Pa_Sleep( NUM_SECONDS * 1000 ); 151 152 err = Pa_StopStream( stream ); 153 if( err != paNoError ) goto error; 154 155 err = Pa_CloseStream( stream ); 156 if( err != paNoError ) goto error; 157 158 Pa_Terminate(); 159 printf("Test finished.\n"); 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 }