1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* Copyright (C) 2012, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_MEDIA_STREAM_AUDIO_DESTINATION_NODE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_MEDIA_STREAM_AUDIO_DESTINATION_NODE_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream.h"
#include "third_party/blink/renderer/modules/webaudio/audio_basic_inspector_node.h"
#include "third_party/blink/renderer/platform/audio/audio_bus.h"
namespace blink {
class AudioContext;
class MediaStreamAudioDestinationHandler final
: public AudioBasicInspectorHandler {
public:
static scoped_refptr<MediaStreamAudioDestinationHandler> Create(
AudioNode&,
uint32_t number_of_channels);
~MediaStreamAudioDestinationHandler() override;
// AudioHandler.
void Process(uint32_t frames_to_process) override;
void SetChannelCount(unsigned, ExceptionState&) override;
uint32_t MaxChannelCount() const;
bool RequiresTailProcessing() const final { return false; }
// This node has no outputs, so we need methods that are different from the
// ones provided by AudioBasicInspectorHnadler, which assume an output.
void PullInputs(uint32_t frames_to_process) override;
void CheckNumberOfChannelsForInput(AudioNodeInput*) override;
// AudioNode
void UpdatePullStatusIfNeeded() override;
private:
MediaStreamAudioDestinationHandler(AudioNode&, uint32_t number_of_channels);
// As an audio source, we will never propagate silence.
bool PropagatesSilence() const override { return false; }
// MediaStreamSource is held alive by MediaStreamAudioDestinationNode.
// Accessed by main thread and during audio thread processing.
//
// TODO: try to avoid such access during audio thread processing.
CrossThreadWeakPersistent<MediaStreamSource> source_;
// This synchronizes dynamic changes to the channel count with
// process() to manage the mix bus.
mutable Mutex process_lock_;
// This internal mix bus is for up/down mixing the input to the actual
// number of channels in the destination.
scoped_refptr<AudioBus> mix_bus_;
};
class MediaStreamAudioDestinationNode final : public AudioBasicInspectorNode {
DEFINE_WRAPPERTYPEINFO();
public:
static MediaStreamAudioDestinationNode* Create(AudioContext&,
uint32_t number_of_channels,
ExceptionState&);
static MediaStreamAudioDestinationNode* Create(AudioContext*,
const AudioNodeOptions*,
ExceptionState&);
MediaStreamAudioDestinationNode(AudioContext&, uint32_t number_of_channels);
MediaStream* stream() const { return stream_; }
MediaStreamSource* source() const { return source_; }
void Trace(Visitor*) const final;
// InspectorHelperMixin
void ReportDidCreate() final;
void ReportWillBeDestroyed() final;
private:
const Member<MediaStreamSource> source_;
const Member<MediaStream> stream_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_MEDIA_STREAM_AUDIO_DESTINATION_NODE_H_
|
