PortAudio 2.0
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00001 00007 /* 00008 * $Id: paex_mono_asio_channel_select.c 1756 2011-09-08 06:09:29Z philburk $ 00009 * 00010 * Authors: 00011 * Ross Bencina <rossb@audiomulch.com> 00012 * Phil Burk <philburk@softsynth.com> 00013 * 00014 * This program uses the PortAudio Portable Audio Library. 00015 * For more information see: http://www.portaudio.com 00016 * Copyright (c) 1999-2000 Ross Bencina and Phil Burk 00017 * 00018 * Permission is hereby granted, free of charge, to any person obtaining 00019 * a copy of this software and associated documentation files 00020 * (the "Software"), to deal in the Software without restriction, 00021 * including without limitation the rights to use, copy, modify, merge, 00022 * publish, distribute, sublicense, and/or sell copies of the Software, 00023 * and to permit persons to whom the Software is furnished to do so, 00024 * subject to the following conditions: 00025 * 00026 * The above copyright notice and this permission notice shall be 00027 * included in all copies or substantial portions of the Software. 00028 * 00029 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 00030 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 00031 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 00032 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR 00033 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 00034 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 00035 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 00036 */ 00037 00038 /* 00039 * The text above constitutes the entire PortAudio license; however, 00040 * the PortAudio community also makes the following non-binding requests: 00041 * 00042 * Any person wishing to distribute modifications to the Software is 00043 * requested to send the modifications to the original developer so that 00044 * they can be incorporated into the canonical version. It is also 00045 * requested that these non-binding requests be included along with the 00046 * license above. 00047 */ 00048 00049 #include <stdio.h> 00050 #include <math.h> 00051 #include "portaudio.h" 00052 #include "pa_asio.h" 00053 00054 #define NUM_SECONDS (10) 00055 #define SAMPLE_RATE (44100) 00056 #define AMPLITUDE (0.8) 00057 #define FRAMES_PER_BUFFER (64) 00058 #define OUTPUT_DEVICE Pa_GetDefaultOutputDevice() 00059 00060 #ifndef M_PI 00061 #define M_PI (3.14159265) 00062 #endif 00063 00064 #define TABLE_SIZE (200) 00065 typedef struct 00066 { 00067 float sine[TABLE_SIZE]; 00068 int phase; 00069 } 00070 paTestData; 00071 00072 /* This routine will be called by the PortAudio engine when audio is needed. 00073 ** It may called at interrupt level on some machines so don't do anything 00074 ** that could mess up the system like calling malloc() or free(). 00075 */ 00076 static int patestCallback( const void *inputBuffer, void *outputBuffer, 00077 unsigned long framesPerBuffer, 00078 const PaStreamCallbackTimeInfo* timeInfo, 00079 PaStreamCallbackFlags statusFlags, 00080 void *userData ) 00081 { 00082 paTestData *data = (paTestData*)userData; 00083 float *out = (float*)outputBuffer; 00084 unsigned long i; 00085 int finished = 0; 00086 /* avoid unused variable warnings */ 00087 (void) inputBuffer; 00088 (void) timeInfo; 00089 (void) statusFlags; 00090 for( i=0; i<framesPerBuffer; i++ ) 00091 { 00092 *out++ = data->sine[data->phase]; /* left */ 00093 data->phase += 1; 00094 if( data->phase >= TABLE_SIZE ) data->phase -= TABLE_SIZE; 00095 } 00096 return finished; 00097 } 00098 00099 /*******************************************************************/ 00100 int main(void); 00101 int main(void) 00102 { 00103 PaStreamParameters outputParameters; 00104 PaAsioStreamInfo asioOutputInfo; 00105 PaStream *stream; 00106 PaError err; 00107 paTestData data; 00108 int outputChannelSelectors[1]; 00109 int i; 00110 printf("PortAudio Test: output MONO sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); 00111 /* initialise sinusoidal wavetable */ 00112 for( i=0; i<TABLE_SIZE; i++ ) 00113 { 00114 data.sine[i] = (float) (AMPLITUDE * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. )); 00115 } 00116 data.phase = 0; 00117 00118 err = Pa_Initialize(); 00119 if( err != paNoError ) goto error; 00120 00121 outputParameters.device = OUTPUT_DEVICE; 00122 outputParameters.channelCount = 1; /* MONO output */ 00123 outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ 00124 outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; 00125 00126 /* Use an ASIO specific structure. WARNING - this is not portable. */ 00127 asioOutputInfo.size = sizeof(PaAsioStreamInfo); 00128 asioOutputInfo.hostApiType = paASIO; 00129 asioOutputInfo.version = 1; 00130 asioOutputInfo.flags = paAsioUseChannelSelectors; 00131 outputChannelSelectors[0] = 1; /* skip channel 0 and use the second (right) ASIO device channel */ 00132 asioOutputInfo.channelSelectors = outputChannelSelectors; 00133 outputParameters.hostApiSpecificStreamInfo = &asioOutputInfo; 00134 00135 err = Pa_OpenStream( 00136 &stream, 00137 NULL, /* no input */ 00138 &outputParameters, 00139 SAMPLE_RATE, 00140 FRAMES_PER_BUFFER, 00141 paClipOff, /* we won't output out of range samples so don't bother clipping them */ 00142 patestCallback, 00143 &data ); 00144 if( err != paNoError ) goto error; 00145 00146 err = Pa_StartStream( stream ); 00147 if( err != paNoError ) goto error; 00148 00149 printf("Play for %d seconds.\n", NUM_SECONDS ); fflush(stdout); 00150 Pa_Sleep( NUM_SECONDS * 1000 ); 00151 00152 err = Pa_StopStream( stream ); 00153 if( err != paNoError ) goto error; 00154 00155 err = Pa_CloseStream( stream ); 00156 if( err != paNoError ) goto error; 00157 00158 Pa_Terminate(); 00159 printf("Test finished.\n"); 00160 return err; 00161 error: 00162 Pa_Terminate(); 00163 fprintf( stderr, "An error occured while using the portaudio stream\n" ); 00164 fprintf( stderr, "Error number: %d\n", err ); 00165 fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); 00166 return err; 00167 }