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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*
* 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_OFFLINE_AUDIO_CONTEXT_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_OFFLINE_AUDIO_CONTEXT_H_
#include "base/synchronization/lock.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/modules/webaudio/base_audio_context.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
namespace blink {
class AudioBuffer;
class ExceptionState;
class OfflineAudioContextOptions;
class OfflineAudioDestinationHandler;
class MODULES_EXPORT OfflineAudioContext final : public BaseAudioContext {
DEFINE_WRAPPERTYPEINFO();
public:
static OfflineAudioContext* Create(ExecutionContext*,
unsigned number_of_channels,
unsigned number_of_frames,
float sample_rate,
ExceptionState&);
static OfflineAudioContext* Create(ExecutionContext*,
const OfflineAudioContextOptions*,
ExceptionState&);
OfflineAudioContext(LocalDOMWindow*,
unsigned number_of_channels,
uint32_t number_of_frames,
float sample_rate,
ExceptionState&);
~OfflineAudioContext() override;
void Trace(Visitor*) const override;
uint32_t length() const { return total_render_frames_; }
ScriptPromise<AudioBuffer> startOfflineRendering(ScriptState*,
ExceptionState&);
ScriptPromise<IDLUndefined> suspendContext(ScriptState*,
double,
ExceptionState&);
ScriptPromise<IDLUndefined> resumeContext(ScriptState*, ExceptionState&);
void RejectPendingResolvers() override;
bool HasRealtimeConstraint() final { return false; }
bool IsPullingAudioGraph() const final;
DEFINE_ATTRIBUTE_EVENT_LISTENER(complete, kComplete)
// Fire completion event when the rendering is finished.
void FireCompletionEvent();
bool HandlePreRenderTasks(uint32_t frames_to_process,
const AudioIOPosition* output_position,
const AudioCallbackMetric* metric,
base::TimeDelta playout_delay,
const media::AudioGlitchInfo& glitch_info) final;
void HandlePostRenderTasks() final;
// Resolve a suspend scheduled at the specified frame. With this specified
// frame as a unique key, the associated promise resolver can be retrieved
// from the map (m_scheduledSuspends) and resolved.
void ResolveSuspendOnMainThread(size_t);
// OfflineAudioContext is not affected by Autoplay, so this MUST do nothing.
void NotifySourceNodeStart() final {}
// The HashMap with 'zero' key is needed because `CurrentSampleFrame()` can be
// zero.
using SuspendMap = HeapHashMap<size_t,
Member<ScriptPromiseResolver<IDLUndefined>>,
IntWithZeroKeyHashTraits<size_t>>;
bool HasPendingActivity() const final;
private:
// Fetch directly the destination handler.
OfflineAudioDestinationHandler& DestinationHandler();
// Check if the rendering needs to be suspended.
bool ShouldSuspend();
// This map is to store the timing of scheduled suspends (frame) and the
// associated promise resolver. This storage can only be modified by the
// main thread and accessed by the audio thread with the graph lock.
//
// The map consists of key-value pairs of:
// { size_t quantized_frame: ScriptPromiseResolverBase resolver }
//
// Note that `quantized_frame` is a unique key, since you can have only one
// suspend scheduled for a certain frame. Accessing to this must be
// protected by the offline context lock.
SuspendMap scheduled_suspends_;
base::Lock suspend_frames_lock_;
// Holds copies of `quantized_frame` in `scheduled_suspends_` to ensure
// a safe access from the audio thread.
HashSet<size_t, IntWithZeroKeyHashTraits<size_t>> scheduled_suspend_frames_
GUARDED_BY(suspend_frames_lock_);
Member<ScriptPromiseResolver<AudioBuffer>> complete_resolver_;
// This flag is necessary to indicate the rendering has actually started or
// running. Note that initial state of context is 'Suspended', which is the
// same state when the context is suspended, so we cannot utilize it for this
// purpose.
bool is_rendering_started_ = false;
// Total render sample length.
uint32_t total_render_frames_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_OFFLINE_AUDIO_CONTEXT_H_
|
