patest_timing.c (6298B)
1 /** @file patest_timing.c 2 @ingroup test_src 3 @brief Play a sine wave for several seconds, and spits out a ton of timing info while it's at it. Based on patest_sine.c 4 @author Bjorn Roche 5 @author Ross Bencina <rossb@audiomulch.com> 6 @author Phil Burk <philburk@softsynth.com> 7 */ 8 /* 9 * $Id: patest_timing.c 578 2003-09-02 04:17:38Z rossbencina $ 10 * 11 * This program uses the PortAudio Portable Audio Library. 12 * For more information see: http://www.portaudio.com/ 13 * Copyright (c) 1999-2000 Ross Bencina and Phil Burk 14 * 15 * Permission is hereby granted, free of charge, to any person obtaining 16 * a copy of this software and associated documentation files 17 * (the "Software"), to deal in the Software without restriction, 18 * including without limitation the rights to use, copy, modify, merge, 19 * publish, distribute, sublicense, and/or sell copies of the Software, 20 * and to permit persons to whom the Software is furnished to do so, 21 * subject to the following conditions: 22 * 23 * The above copyright notice and this permission notice shall be 24 * included in all copies or substantial portions of the Software. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 29 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR 30 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 31 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 32 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 33 */ 34 35 /* 36 * The text above constitutes the entire PortAudio license; however, 37 * the PortAudio community also makes the following non-binding requests: 38 * 39 * Any person wishing to distribute modifications to the Software is 40 * requested to send the modifications to the original developer so that 41 * they can be incorporated into the canonical version. It is also 42 * requested that these non-binding requests be included along with the 43 * license above. 44 */ 45 46 #include <stdio.h> 47 #include <math.h> 48 #include "portaudio.h" 49 50 #define NUM_SECONDS (5) 51 #define SAMPLE_RATE (44100) 52 #define FRAMES_PER_BUFFER (64) 53 54 #ifndef M_PI 55 #define M_PI (3.14159265) 56 #endif 57 58 #define TABLE_SIZE (200) 59 typedef struct 60 { 61 PaStream *stream; 62 PaTime start; 63 float sine[TABLE_SIZE]; 64 int left_phase; 65 int right_phase; 66 } 67 paTestData; 68 69 /* This routine will be called by the PortAudio engine when audio is needed. 70 ** It may called at interrupt level on some machines so don't do anything 71 ** that could mess up the system like calling malloc() or free(). 72 */ 73 static int patestCallback( const void *inputBuffer, void *outputBuffer, 74 unsigned long framesPerBuffer, 75 const PaStreamCallbackTimeInfo* timeInfo, 76 PaStreamCallbackFlags statusFlags, 77 void *userData ) 78 { 79 paTestData *data = (paTestData*)userData; 80 float *out = (float*)outputBuffer; 81 unsigned long i; 82 83 (void) timeInfo; /* Prevent unused variable warnings. */ 84 (void) statusFlags; 85 (void) inputBuffer; 86 87 printf( "Timing info given to callback: Adc: %g, Current: %g, Dac: %g\n", 88 timeInfo->inputBufferAdcTime, 89 timeInfo->currentTime, 90 timeInfo->outputBufferDacTime ); 91 92 printf( "getStreamTime() returns: %g\n", Pa_GetStreamTime(data->stream) - data->start ); 93 94 for( i=0; i<framesPerBuffer; i++ ) 95 { 96 *out++ = data->sine[data->left_phase]; /* left */ 97 *out++ = data->sine[data->right_phase]; /* right */ 98 data->left_phase += 1; 99 if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE; 100 data->right_phase += 3; /* higher pitch so we can distinguish left and right. */ 101 if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE; 102 } 103 104 return paContinue; 105 } 106 107 /*******************************************************************/ 108 int main(void); 109 int main(void) 110 { 111 PaStreamParameters outputParameters; 112 PaStream *stream; 113 PaError err; 114 paTestData data; 115 int i; 116 117 118 printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); 119 120 /* initialise sinusoidal wavetable */ 121 for( i=0; i<TABLE_SIZE; i++ ) 122 { 123 data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); 124 } 125 data.left_phase = data.right_phase = 0; 126 127 err = Pa_Initialize(); 128 if( err != paNoError ) goto error; 129 130 outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ 131 outputParameters.channelCount = 2; /* stereo output */ 132 outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ 133 outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; 134 outputParameters.hostApiSpecificStreamInfo = NULL; 135 136 err = Pa_OpenStream( 137 &stream, 138 NULL, /* no input */ 139 &outputParameters, 140 SAMPLE_RATE, 141 FRAMES_PER_BUFFER, 142 paClipOff, /* we won't output out of range samples so don't bother clipping them */ 143 patestCallback, 144 &data ); 145 data.stream = stream; 146 data.start = Pa_GetStreamTime(stream); 147 if( err != paNoError ) goto error; 148 149 err = Pa_StartStream( stream ); 150 data.start = Pa_GetStreamTime(stream); 151 if( err != paNoError ) goto error; 152 153 printf("Play for %d seconds.\n", NUM_SECONDS ); 154 Pa_Sleep( NUM_SECONDS * 1000 ); 155 156 err = Pa_StopStream( stream ); 157 if( err != paNoError ) goto error; 158 159 err = Pa_CloseStream( stream ); 160 if( err != paNoError ) goto error; 161 162 Pa_Terminate(); 163 printf("Test finished.\n"); 164 printf("The tone should have been heard for about 5 seconds and all the timing info above should report that about 5 seconds elapsed (except Adc, which is undefined since there was no input device opened).\n"); 165 166 return err; 167 error: 168 Pa_Terminate(); 169 fprintf( stderr, "An error occured while using the portaudio stream\n" ); 170 fprintf( stderr, "Error number: %d\n", err ); 171 fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); 172 return err; 173 }