OpenShot Audio Library | OpenShotAudio 0.4.0

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juce_ARAAudioReaders.h
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
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 7 End-User License
11 Agreement and JUCE Privacy Policy.
12
13 End User License Agreement: www.juce.com/juce-7-licence
14 Privacy Policy: www.juce.com/juce-privacy-policy
15
16 Or: You may also use this code under the terms of the GPL v3 (see
17 www.gnu.org/licenses).
18
19 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
20 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
21 DISCLAIMED.
22
23 ==============================================================================
24*/
25
26#pragma once
27
28 namespace juce
29{
30
31 class AudioProcessor;
32
33/* All these readers follow a common pattern of "invalidation":
34
35 Whenever the samples they are reading are altered, the readers become invalid and will stop
36 accessing the model graph. These alterations are model edits such as property changes, content
37 changes (if affecting sample scope), or the deletion of some model object involved in the read
38 process. Since these edits are performed on the document controller thread, reader validity can
39 immediately be checked after the edit has been concluded, and any reader that has become invalid
40 can be recreated.
41
42 Note that encountering a failure in any individual read call does not invalidate the reader, so
43 that the entity using the reader can decide whether to retry or to back out. This includes trying
44 to read an audio source for which the host has currently disabled access: the failure will be
45 immediately visible, but the reader will remain valid. This ensures that for example a realtime
46 renderer can just keep reading and will be seeing proper samples again once sample access is
47 re-enabled.
48
49 If desired, the code calling readSamples() can also implement proper signaling of any read error
50 to the document controller thread to trigger rebuilding the reader as needed. This will typically
51 be done when implementing audio source analysis: if there is an error upon reading the samples
52 that cannot be resolved within a reasonable timeout, then the analysis would be aborted. The
53 document controller code that monitors the analysis tasks can evaluate this and re-launch a new
54 analysis when appropriate (e.g. when access is re-enabled).
55
56 When reading playback regions (directly or through a region sequence reader), the reader will
57 represent the regions as a single source object that covers the union of all affected regions.
58 The first sample produced by the reader thus will be the first sample of the earliest region.
59 This means that the location of this region has to be taken into account by the calling code if
60 it wants to relate the samples to the model or any other reader output.
61*/
62
63//==============================================================================
77 class JUCE_API ARAAudioSourceReader : public AudioFormatReader,
78 private ARAAudioSource::Listener
79{
80 public:
82 explicit ARAAudioSourceReader (ARAAudioSource* audioSource);
83
84 ~ARAAudioSourceReader() override;
85
86 bool readSamples (int* const* destSamples,
87 int numDestChannels,
88 int startOffsetInDestBuffer,
89 int64 startSampleInFile,
90 int numSamples) override;
91
95 bool isValid() const { return audioSourceBeingRead != nullptr; }
96
100 void invalidate();
101
102 void willUpdateAudioSourceProperties (ARAAudioSource* audioSource,
103 ARAAudioSource::PropertiesPtr newProperties) override;
104 void doUpdateAudioSourceContent (ARAAudioSource* audioSource,
105 ARAContentUpdateScopes scopeFlags) override;
106 void willEnableAudioSourceSamplesAccess (ARAAudioSource* audioSource, bool enable) override;
107 void didEnableAudioSourceSamplesAccess (ARAAudioSource* audioSource, bool enable) override;
108 void willDestroyAudioSource (ARAAudioSource* audioSource) override;
109
110 private:
111 ARAAudioSource* audioSourceBeingRead;
112 std::unique_ptr<ARA::PlugIn::HostAudioReader> hostReader;
113 ReadWriteLock lock;
114 std::vector<void*> tmpPtrs;
115
116 JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ARAAudioSourceReader)
117};
118
119//==============================================================================
138 class JUCE_API ARAPlaybackRegionReader : public AudioFormatReader,
139 private ARAPlaybackRegion::Listener
140{
141 public:
147 explicit ARAPlaybackRegionReader (ARAPlaybackRegion* playbackRegion);
148
156 ARAPlaybackRegionReader (double sampleRate, int numChannels,
157 const std::vector<ARAPlaybackRegion*>& playbackRegions);
158
159 ~ARAPlaybackRegionReader() override;
160
162 bool isValid() const { return (playbackRenderer != nullptr); }
163
167 void invalidate();
168
169 bool readSamples (int* const* destSamples,
170 int numDestChannels,
171 int startOffsetInDestBuffer,
172 int64 startSampleInFile,
173 int numSamples) override;
174
175 void willUpdatePlaybackRegionProperties (ARAPlaybackRegion* playbackRegion,
176 ARAPlaybackRegion::PropertiesPtr newProperties) override;
177 void didUpdatePlaybackRegionContent (ARAPlaybackRegion* playbackRegion,
178 ARAContentUpdateScopes scopeFlags) override;
179 void willDestroyPlaybackRegion (ARAPlaybackRegion* playbackRegion) override;
180
182 int64 startInSamples = 0;
183
184 private:
185 std::unique_ptr<ARAPlaybackRenderer> playbackRenderer;
186 AudioPlayHead::PositionInfo positionInfo;
187 ReadWriteLock lock;
188
189 static constexpr int maximumBlockSize = 4 * 1024;
190
191 JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ARAPlaybackRegionReader)
192};
193
194} // namespace juce
juce::ARAAudioSourceReader
Definition juce_ARAAudioReaders.h:79
juce::ARAAudioSourceReader::isValid
bool isValid() const
Definition juce_ARAAudioReaders.h:95
juce::ARAPlaybackRegionReader
Definition juce_ARAAudioReaders.h:140
juce::ARAPlaybackRegionReader::isValid
bool isValid() const
Definition juce_ARAAudioReaders.h:162
juce::AudioFormatReader
Definition juce_AudioFormatReader.h:44
juce::AudioPlayHead::PositionInfo
Definition juce_AudioPlayHead.h:318
juce::ReadWriteLock
Definition juce_ReadWriteLock.h:48