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
media / base / offloading_audio_encoder.h [blame]
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_BASE_OFFLOADING_AUDIO_ENCODER_H_
#define MEDIA_BASE_OFFLOADING_AUDIO_ENCODER_H_
#include <memory>
#include <type_traits>
#include "base/sequence_checker.h"
#include "media/base/audio_encoder.h"
namespace base {
class SequencedTaskRunner;
}
namespace media {
// A wrapper around audio encoder that offloads all the calls to a dedicated
// task runner. It's used to move synchronous software encoding work off the
// current (main) thread.
class MEDIA_EXPORT OffloadingAudioEncoder final : public AudioEncoder {
public:
// |work_runner| - task runner for encoding work
// |callback_runner| - all encoder's callbacks will be executed on this task
// runner.
OffloadingAudioEncoder(
std::unique_ptr<AudioEncoder> wrapped_encoder,
scoped_refptr<base::SequencedTaskRunner> work_runner,
scoped_refptr<base::SequencedTaskRunner> callback_runner);
// Uses current task runner for callbacks and asks thread pool for a new task
// runner to do actual encoding work.
explicit OffloadingAudioEncoder(
std::unique_ptr<AudioEncoder> wrapped_encoder);
~OffloadingAudioEncoder() override;
void Initialize(const Options& options,
OutputCB output_cb,
EncoderStatusCB done_cb) override;
void Encode(std::unique_ptr<AudioBus> audio_bus,
base::TimeTicks capture_time,
EncoderStatusCB done_cb) override;
void Flush(EncoderStatusCB done_cb) override;
private:
template <class T>
T WrapCallback(T cb);
std::unique_ptr<AudioEncoder> wrapped_encoder_;
const scoped_refptr<base::SequencedTaskRunner> work_runner_;
const scoped_refptr<base::SequencedTaskRunner> callback_runner_;
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace media
#endif // MEDIA_BASE_OFFLOADING_AUDIO_ENCODER_H_