blob: c528473fc91b1913192f3248b7c206fdd70ff30b (
plain)
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
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_
#define MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_
// NullAudioSink effectively uses an extra thread to "throw away" the
// audio data at a rate resembling normal playback speed. It's just like
// decoding to /dev/null!
//
// NullAudioSink can also be used in situations where the client has no
// audio device or we haven't written an audio implementation for a particular
// platform yet.
#include "base/md5.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/thread.h"
#include "media/base/audio_renderer_sink.h"
namespace media {
class AudioBus;
class MEDIA_EXPORT NullAudioSink
: NON_EXPORTED_BASE(public AudioRendererSink) {
public:
NullAudioSink();
// AudioRendererSink implementation.
virtual void Initialize(const AudioParameters& params,
RenderCallback* callback) OVERRIDE;
virtual void Start() OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void Pause(bool flush) OVERRIDE;
virtual void Play() OVERRIDE;
virtual bool SetVolume(double volume) OVERRIDE;
// Enables audio frame hashing and reinitializes the MD5 context. Must be
// called prior to Initialize().
void StartAudioHashForTesting();
// Returns the MD5 hash of all audio frames seen since the last reset.
std::string GetAudioHashForTesting();
protected:
virtual ~NullAudioSink();
private:
// Audio thread task that periodically calls FillBuffer() to consume
// audio data.
void FillBufferTask();
void SetPlaying(bool is_playing);
// A buffer passed to FillBuffer to advance playback.
scoped_ptr<AudioBus> audio_bus_;
AudioParameters params_;
bool initialized_;
bool playing_;
RenderCallback* callback_;
// Separate thread used to throw away data.
base::Thread thread_;
base::Lock lock_;
// Controls whether or not a running MD5 hash is computed for audio frames.
bool hash_audio_for_testing_;
scoped_array<base::MD5Context> md5_channel_contexts_;
DISALLOW_COPY_AND_ASSIGN(NullAudioSink);
};
} // namespace media
#endif // MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_
|
