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comparison projects/basic/render.cpp @ 13:6adb088196a7

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Fixed ADC bug; added a simple passthrough test
author andrewm
date Fri, 23 Jan 2015 15:17:09 +0000
parents a6beeba3a648
children ad5cd8dd99b3
comparison
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12:a6beeba3a648 13:6adb088196a7
10 #include <cmath> 10 #include <cmath>
11 11
12 float gFrequency; 12 float gFrequency;
13 float gPhase; 13 float gPhase;
14 float gInverseSampleRate; 14 float gInverseSampleRate;
15 int gNumChannels;
16 15
17 // initialise_render() is called once before the audio rendering starts. 16 // initialise_render() is called once before the audio rendering starts.
18 // Use it to perform any initialisation and allocation which is dependent 17 // Use it to perform any initialisation and allocation which is dependent
19 // on the period size or sample rate. 18 // on the period size or sample rate.
20 // 19 //
30 void *userData) 29 void *userData)
31 { 30 {
32 // Retrieve a parameter passed in from the initAudio() call 31 // Retrieve a parameter passed in from the initAudio() call
33 gFrequency = *(float *)userData; 32 gFrequency = *(float *)userData;
34 33
35 gNumChannels = numAudioChannels;
36 gInverseSampleRate = 1.0 / audioSampleRate; 34 gInverseSampleRate = 1.0 / audioSampleRate;
37 gPhase = 0.0; 35 gPhase = 0.0;
38 36
39 return true; 37 return true;
40 } 38 }
51 float out = 0.8f * sinf(gPhase); 49 float out = 0.8f * sinf(gPhase);
52 gPhase += 2.0 * M_PI * gFrequency * gInverseSampleRate; 50 gPhase += 2.0 * M_PI * gFrequency * gInverseSampleRate;
53 if(gPhase > 2.0 * M_PI) 51 if(gPhase > 2.0 * M_PI)
54 gPhase -= 2.0 * M_PI; 52 gPhase -= 2.0 * M_PI;
55 53
56 for(int channel = 0; channel < gNumChannels; channel++) 54 for(int channel = 0; channel < gNumAudioChannels; channel++)
57 audioOut[n * gNumChannels + channel] = out; 55 audioOut[n * gNumAudioChannels + channel] = out;
58 } 56 }
59 } 57 }
60 58
61 // cleanup_render() is called once at the end, after the audio has stopped. 59 // cleanup_render() is called once at the end, after the audio has stopped.
62 // Release any resources that were allocated in initialise_render(). 60 // Release any resources that were allocated in initialise_render().