OpenShot Audio Library | OpenShotAudio  0.3.0
juce_AudioProcessLoadMeasurer.cpp
1 /*
2  ==============================================================================
3 
4  This file is part of the JUCE library.
5  Copyright (c) 2017 - ROLI Ltd.
6 
7  JUCE is an open source library subject to commercial or open-source
8  licensing.
9 
10  By using JUCE, you agree to the terms of both the JUCE 5 End-User License
11  Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
12  27th April 2017).
13 
14  End User License Agreement: www.juce.com/juce-5-licence
15  Privacy Policy: www.juce.com/juce-5-privacy-policy
16 
17  Or: You may also use this code under the terms of the GPL v3 (see
18  www.gnu.org/licenses).
19 
20  JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
21  EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
22  DISCLAIMED.
23 
24  ==============================================================================
25 */
26 
27 namespace juce
28 {
29 
30 AudioProcessLoadMeasurer::AudioProcessLoadMeasurer() {}
32 
34 {
35  reset (0, 0);
36 }
37 
38 void AudioProcessLoadMeasurer::reset (double sampleRate, int blockSize)
39 {
40  cpuUsageMs = 0;
41  xruns = 0;
42 
43  if (sampleRate > 0.0 && blockSize > 0)
44  {
45  msPerBlock = 1000.0 * blockSize / sampleRate;
46  timeToCpuScale = (msPerBlock > 0.0) ? (1.0 / msPerBlock) : 0.0;
47  }
48  else
49  {
50  msPerBlock = 0;
51  timeToCpuScale = 0;
52  }
53 }
54 
56 {
57  const double filterAmount = 0.2;
58  cpuUsageMs += filterAmount * (milliseconds - cpuUsageMs);
59 
60  if (milliseconds > msPerBlock)
61  ++xruns;
62 }
63 
64 double AudioProcessLoadMeasurer::getLoadAsProportion() const { return jlimit (0.0, 1.0, timeToCpuScale * cpuUsageMs); }
66 
67 int AudioProcessLoadMeasurer::getXRunCount() const { return xruns; }
68 
69 AudioProcessLoadMeasurer::ScopedTimer::ScopedTimer (AudioProcessLoadMeasurer& p)
70  : owner (p), startTime (Time::getMillisecondCounterHiRes())
71 {
72 }
73 
74 AudioProcessLoadMeasurer::ScopedTimer::~ScopedTimer()
75 {
76  owner.registerBlockRenderTime (Time::getMillisecondCounterHiRes() - startTime);
77 }
78 
79 } // namespace juce
static double getMillisecondCounterHiRes() noexcept
void registerBlockRenderTime(double millisecondsTaken)