OpenShot Library | libopenshot-audio 0.2.0
juce_AudioSourcePlayer.h
1
2/** @weakgroup juce_audio_devices-sources
3 * @{
4 */
5/*
6 ==============================================================================
7
8 This file is part of the JUCE library.
9 Copyright (c) 2017 - ROLI Ltd.
10
11 JUCE is an open source library subject to commercial or open-source
12 licensing.
13
14 The code included in this file is provided under the terms of the ISC license
15 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
16 To use, copy, modify, and/or distribute this software for any purpose with or
17 without fee is hereby granted provided that the above copyright notice and
18 this permission notice appear in all copies.
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
27namespace juce
28{
29
30//==============================================================================
31/**
32 Wrapper class to continuously stream audio from an audio source to an
33 AudioIODevice.
34
35 This object acts as an AudioIODeviceCallback, so can be attached to an
36 output device, and will stream audio from an AudioSource.
37
38 @tags{Audio}
39*/
41{
42public:
43 //==============================================================================
44 /** Creates an empty AudioSourcePlayer. */
46
47 /** Destructor.
48
49 Make sure this object isn't still being used by an AudioIODevice before
50 deleting it!
51 */
52 ~AudioSourcePlayer() override;
53
54 //==============================================================================
55 /** Changes the current audio source to play from.
56
57 If the source passed in is already being used, this method will do nothing.
58 If the source is not null, its prepareToPlay() method will be called
59 before it starts being used for playback.
60
61 If there's another source currently playing, its releaseResources() method
62 will be called after it has been swapped for the new one.
63
64 @param newSource the new source to use - this will NOT be deleted
65 by this object when no longer needed, so it's the
66 caller's responsibility to manage it.
67 */
68 void setSource (AudioSource* newSource);
69
70 /** Returns the source that's playing.
71 May return nullptr if there's no source.
72 */
74
75 /** Sets a gain to apply to the audio data.
76 @see getGain
77 */
78 void setGain (float newGain) noexcept;
79
80 /** Returns the current gain.
81 @see setGain
82 */
83 float getGain() const noexcept { return gain; }
84
85 //==============================================================================
86 /** Implementation of the AudioIODeviceCallback method. */
87 void audioDeviceIOCallback (const float** inputChannelData,
89 float** outputChannelData,
91 int numSamples) override;
92
93 /** Implementation of the AudioIODeviceCallback method. */
94 void audioDeviceAboutToStart (AudioIODevice* device) override;
95
96 /** Implementation of the AudioIODeviceCallback method. */
97 void audioDeviceStopped() override;
98
99 /** An alternative method for initialising the source without an AudioIODevice. */
100 void prepareToPlay (double sampleRate, int blockSize);
101
102private:
103 //==============================================================================
104 CriticalSection readLock;
105 AudioSource* source = nullptr;
106 double sampleRate = 0;
107 int bufferSize = 0;
108 float* channels[128];
109 float* outputChans[128];
110 const float* inputChans[128];
111 AudioBuffer<float> tempBuffer;
112 float lastGain = 1.0f, gain = 1.0f;
113
114 JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioSourcePlayer)
115};
116
117} // namespace juce
118
119/** @}*/
Holds a resizable array of primitive or copy-by-value objects.
Definition juce_Array.h:60
One of these is passed to an AudioIODevice object to stream the audio data in and out.
Base class for an audio device with synchronised input and output channels.
Wrapper class to continuously stream audio from an audio source to an AudioIODevice.
float getGain() const noexcept
Returns the current gain.
AudioSource * getCurrentSource() const noexcept
Returns the source that's playing.
Base class for objects that can produce a continuous stream of audio.
#define JUCE_API
This macro is added to all JUCE public class declarations.