PortAudio 2.0
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00001 00007 /* 00008 * $Id: paex_sine.c 1752 2011-09-08 03:21:55Z philburk $ 00009 * 00010 * This program uses the PortAudio Portable Audio Library. 00011 * For more information see: http://www.portaudio.com/ 00012 * Copyright (c) 1999-2000 Ross Bencina and Phil Burk 00013 * 00014 * Permission is hereby granted, free of charge, to any person obtaining 00015 * a copy of this software and associated documentation files 00016 * (the "Software"), to deal in the Software without restriction, 00017 * including without limitation the rights to use, copy, modify, merge, 00018 * publish, distribute, sublicense, and/or sell copies of the Software, 00019 * and to permit persons to whom the Software is furnished to do so, 00020 * subject to the following conditions: 00021 * 00022 * The above copyright notice and this permission notice shall be 00023 * included in all copies or substantial portions of the Software. 00024 * 00025 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 00026 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 00027 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 00028 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR 00029 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 00030 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 00031 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 00032 */ 00033 00034 /* 00035 * The text above constitutes the entire PortAudio license; however, 00036 * the PortAudio community also makes the following non-binding requests: 00037 * 00038 * Any person wishing to distribute modifications to the Software is 00039 * requested to send the modifications to the original developer so that 00040 * they can be incorporated into the canonical version. It is also 00041 * requested that these non-binding requests be included along with the 00042 * license above. 00043 */ 00044 #include <stdio.h> 00045 #include <math.h> 00046 #include "portaudio.h" 00047 00048 #define NUM_SECONDS (5) 00049 #define SAMPLE_RATE (44100) 00050 #define FRAMES_PER_BUFFER (64) 00051 00052 #ifndef M_PI 00053 #define M_PI (3.14159265) 00054 #endif 00055 00056 #define TABLE_SIZE (200) 00057 typedef struct 00058 { 00059 float sine[TABLE_SIZE]; 00060 int left_phase; 00061 int right_phase; 00062 char message[20]; 00063 } 00064 paTestData; 00065 00066 /* This routine will be called by the PortAudio engine when audio is needed. 00067 ** It may called at interrupt level on some machines so don't do anything 00068 ** that could mess up the system like calling malloc() or free(). 00069 */ 00070 static int patestCallback( const void *inputBuffer, void *outputBuffer, 00071 unsigned long framesPerBuffer, 00072 const PaStreamCallbackTimeInfo* timeInfo, 00073 PaStreamCallbackFlags statusFlags, 00074 void *userData ) 00075 { 00076 paTestData *data = (paTestData*)userData; 00077 float *out = (float*)outputBuffer; 00078 unsigned long i; 00079 00080 (void) timeInfo; /* Prevent unused variable warnings. */ 00081 (void) statusFlags; 00082 (void) inputBuffer; 00083 00084 for( i=0; i<framesPerBuffer; i++ ) 00085 { 00086 *out++ = data->sine[data->left_phase]; /* left */ 00087 *out++ = data->sine[data->right_phase]; /* right */ 00088 data->left_phase += 1; 00089 if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE; 00090 data->right_phase += 3; /* higher pitch so we can distinguish left and right. */ 00091 if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE; 00092 } 00093 00094 return paContinue; 00095 } 00096 00097 /* 00098 * This routine is called by portaudio when playback is done. 00099 */ 00100 static void StreamFinished( void* userData ) 00101 { 00102 paTestData *data = (paTestData *) userData; 00103 printf( "Stream Completed: %s\n", data->message ); 00104 } 00105 00106 /*******************************************************************/ 00107 int main(void); 00108 int main(void) 00109 { 00110 PaStreamParameters outputParameters; 00111 PaStream *stream; 00112 PaError err; 00113 paTestData data; 00114 int i; 00115 00116 00117 printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); 00118 00119 /* initialise sinusoidal wavetable */ 00120 for( i=0; i<TABLE_SIZE; i++ ) 00121 { 00122 data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); 00123 } 00124 data.left_phase = data.right_phase = 0; 00125 00126 err = Pa_Initialize(); 00127 if( err != paNoError ) goto error; 00128 00129 outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ 00130 if (outputParameters.device == paNoDevice) { 00131 fprintf(stderr,"Error: No default output device.\n"); 00132 goto error; 00133 } 00134 outputParameters.channelCount = 2; /* stereo output */ 00135 outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ 00136 outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; 00137 outputParameters.hostApiSpecificStreamInfo = NULL; 00138 00139 err = Pa_OpenStream( 00140 &stream, 00141 NULL, /* no input */ 00142 &outputParameters, 00143 SAMPLE_RATE, 00144 FRAMES_PER_BUFFER, 00145 paClipOff, /* we won't output out of range samples so don't bother clipping them */ 00146 patestCallback, 00147 &data ); 00148 if( err != paNoError ) goto error; 00149 00150 sprintf( data.message, "No Message" ); 00151 err = Pa_SetStreamFinishedCallback( stream, &StreamFinished ); 00152 if( err != paNoError ) goto error; 00153 00154 err = Pa_StartStream( stream ); 00155 if( err != paNoError ) goto error; 00156 00157 printf("Play for %d seconds.\n", NUM_SECONDS ); 00158 Pa_Sleep( NUM_SECONDS * 1000 ); 00159 00160 err = Pa_StopStream( stream ); 00161 if( err != paNoError ) goto error; 00162 00163 err = Pa_CloseStream( stream ); 00164 if( err != paNoError ) goto error; 00165 00166 Pa_Terminate(); 00167 printf("Test finished.\n"); 00168 00169 return err; 00170 error: 00171 Pa_Terminate(); 00172 fprintf( stderr, "An error occured while using the portaudio stream\n" ); 00173 fprintf( stderr, "Error number: %d\n", err ); 00174 fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); 00175 return err; 00176 }