OpenShot Audio Library | OpenShotAudio  0.3.0
juce_AudioFormatReaderSource.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 
31  const bool deleteReaderWhenThisIsDeleted)
32  : reader (r, deleteReaderWhenThisIsDeleted),
33  nextPlayPos (0),
34  looping (false)
35 {
36  jassert (reader != nullptr);
37 }
38 
40 
41 int64 AudioFormatReaderSource::getTotalLength() const { return reader->lengthInSamples; }
42 void AudioFormatReaderSource::setNextReadPosition (int64 newPosition) { nextPlayPos = newPosition; }
43 void AudioFormatReaderSource::setLooping (bool shouldLoop) { looping = shouldLoop; }
44 
46 {
47  return looping ? nextPlayPos % reader->lengthInSamples
48  : nextPlayPos;
49 }
50 
51 void AudioFormatReaderSource::prepareToPlay (int /*samplesPerBlockExpected*/, double /*sampleRate*/) {}
53 
55 {
56  if (info.numSamples > 0)
57  {
58  const int64 start = nextPlayPos;
59 
60  if (looping)
61  {
62  const int64 newStart = start % reader->lengthInSamples;
63  const int64 newEnd = (start + info.numSamples) % reader->lengthInSamples;
64 
65  if (newEnd > newStart)
66  {
67  reader->read (info.buffer, info.startSample,
68  (int) (newEnd - newStart), newStart, true, true);
69  }
70  else
71  {
72  const int endSamps = (int) (reader->lengthInSamples - newStart);
73 
74  reader->read (info.buffer, info.startSample,
75  endSamps, newStart, true, true);
76 
77  reader->read (info.buffer, info.startSample + endSamps,
78  (int) newEnd, 0, true, true);
79  }
80 
81  nextPlayPos = newEnd;
82  }
83  else
84  {
85  reader->read (info.buffer, info.startSample,
86  info.numSamples, start, true, true);
87  nextPlayPos += info.numSamples;
88  }
89  }
90 }
91 
92 } // namespace juce
void prepareToPlay(int samplesPerBlockExpected, double sampleRate) override
AudioFormatReaderSource(AudioFormatReader *sourceReader, bool deleteReaderWhenThisIsDeleted)
void setLooping(bool shouldLoop) override
void setNextReadPosition(int64 newPosition) override
void getNextAudioBlock(const AudioSourceChannelInfo &) override
AudioBuffer< float > * buffer