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1 #include <cmath>
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2 #include <stdlib.h>
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3 #include <iostream>
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4 #include <vector>
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5 #include "RtAudio.h"
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6
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7 int myCallback(void *outputBuffer, void *inputBuffer, unsigned int bufferFrames, double streamTime, RtAudioStreamStatus status, void *userData) {
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8 unsigned int i, j;
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9 float *buffer = (float *) outputBuffer;
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10
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11 if ( status )
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12 std::cout << "Stream underflow detected!" << std::endl;
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13
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14 if (!buffer)
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15 return 0;
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16
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17 // Write interleaved audio data.
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18 static int t = 0;
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19 for ( i=0; i<bufferFrames/2; i++ ) {
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20 for ( j=0; j<2; j++ ) {
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21 *buffer++ = 0; // 0.25*cosf((t/(float)1000));
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22
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23 }
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24 if (++t > 1000) t = 0;
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25 }
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26
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27 return 0;
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28 }
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29
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30 int main() {
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31 RtAudio audio;
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32
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33 // Determine the number of devices available
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34 unsigned int devices = audio.getDeviceCount();
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35 std::cout << devices << " devices found\n";
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36
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37 // Scan through devices for various capabilities
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38 RtAudio::DeviceInfo info;
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39 for ( unsigned int i=0; i<devices; i++ ) {
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40
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41 info = audio.getDeviceInfo( i );
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42
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43 if ( info.probed == true ) {
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44 // Print, for example, the maximum number of output channels for each device
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45 std::cout << "device: #" << i << " - " << info.name << "\n";
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46 std::cout << " output channels: " << info.outputChannels << "\n";
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47 std::cout << " input channels: " << info.inputChannels << "\n";
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48 std::cout << " duplex channels: " << info.duplexChannels << "\n";
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49 std::cout << " default input/output: " << info.isDefaultInput << " / " << info.isDefaultOutput << "\n";
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50
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51 std::cout << " sample rates:\n";
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52 for (std::vector<unsigned int>::iterator i = info.sampleRates.begin(); i != info.sampleRates.end(); i++) {
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53 std::cout << " " << *i << "\n";
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54 }
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55 std::cout << " data formats:\n";
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56 if (info.nativeFormats & RTAUDIO_SINT8) std::cout << " signed 8-bit\n";
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57 if (info.nativeFormats & RTAUDIO_SINT16) std::cout << " signed 16-bit\n";
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58 if (info.nativeFormats & RTAUDIO_SINT24) std::cout << " signed 24-bit\n";
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59 if (info.nativeFormats & RTAUDIO_SINT32) std::cout << " signed 32-bit\n";
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60 if (info.nativeFormats & RTAUDIO_FLOAT32) std::cout << " 32-bit float [-1,1]\n";
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61 if (info.nativeFormats & RTAUDIO_FLOAT64) std::cout << " 64-bit float [-1,1]\n";
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62 }
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63 else
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64 std::cout << "device: #" << i << " - not probed\n";
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65 }
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66
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67 RtAudio::StreamParameters oparam;
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68 oparam.deviceId = audio.getDefaultOutputDevice();
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69 oparam.nChannels = 1;
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70 oparam.firstChannel = 0;
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71
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72 RtAudio::StreamParameters iparam;
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73 iparam.deviceId = audio.getDefaultInputDevice();
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74 iparam.nChannels = 1;
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75 iparam.firstChannel = 0;
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76
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77
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78 unsigned int sampleRate = 44100;
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79 unsigned int bufferFrames = 256; // 256 sample frames
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80
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81 RtAudio::StreamOptions options;
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82 options.flags = 0;
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83 options.numberOfBuffers = 2;
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84 options.streamName = "test";
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85
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86
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87 try {
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88 audio.openStream( &oparam, &iparam, RTAUDIO_FLOAT32,
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89 sampleRate, &bufferFrames, &myCallback, (void*) 0, &options );
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90 audio.startStream();
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91 }
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92 catch ( RtError& e ) {
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93 std::cout << '\n' << e.getMessage() << '\n' << std::endl;
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94 exit( EXIT_FAILURE );
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95 }
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96
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97 char input;
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98 std::cout << "\nPlaying ... press <enter> to quit.\n";
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99 std::cin.get( input );
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100
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101 try {
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102 // Stop the stream
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103 audio.stopStream();
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104 }
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105 catch (RtError& e) {
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106 e.printMessage();
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107 }
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108
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109 if ( audio.isStreamOpen() )
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110 audio.closeStream();
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111
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112 return EXIT_SUCCESS;
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113 }
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