OpenShot Library | OpenShotAudio  0.2.1
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
Returns the number of millisecs since a fixed event (usually system startup).
Maintains an ongoing measurement of the proportion of time which is being spent inside an audio callb...
void registerBlockRenderTime(double millisecondsTaken)
Can be called manually to add the time of a callback to the stats.
double getLoadAsPercentage() const
Returns the current load as a percentage 0 to 100.0.
double getLoadAsProportion() const
Returns the current load as a proportion 0 to 1.0.
int getXRunCount() const
Returns the number of over- (or under-) runs recorded since the state was reset.