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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_ | 5 #ifndef MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_ |
6 #define MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_ | 6 #define MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_ |
7 | 7 |
8 // NullAudioSink effectively uses an extra thread to "throw away" the | 8 // NullAudioSink effectively uses an extra thread to "throw away" the |
9 // audio data at a rate resembling normal playback speed. It's just like | 9 // audio data at a rate resembling normal playback speed. It's just like |
10 // decoding to /dev/null! | 10 // decoding to /dev/null! |
(...skipping 15 matching lines...) Expand all Loading... |
26 public: | 26 public: |
27 NullAudioSink(); | 27 NullAudioSink(); |
28 | 28 |
29 // AudioRendererSink implementation. | 29 // AudioRendererSink implementation. |
30 virtual void Initialize(const AudioParameters& params, | 30 virtual void Initialize(const AudioParameters& params, |
31 RenderCallback* callback) OVERRIDE; | 31 RenderCallback* callback) OVERRIDE; |
32 virtual void Start() OVERRIDE; | 32 virtual void Start() OVERRIDE; |
33 virtual void Stop() OVERRIDE; | 33 virtual void Stop() OVERRIDE; |
34 virtual void Pause(bool flush) OVERRIDE; | 34 virtual void Pause(bool flush) OVERRIDE; |
35 virtual void Play() OVERRIDE; | 35 virtual void Play() OVERRIDE; |
36 virtual void SetPlaybackRate(float rate) OVERRIDE; | |
37 virtual bool SetVolume(double volume) OVERRIDE; | 36 virtual bool SetVolume(double volume) OVERRIDE; |
38 | 37 |
39 // Enables audio frame hashing and reinitializes the MD5 context. Must be | 38 // Enables audio frame hashing and reinitializes the MD5 context. Must be |
40 // called prior to Initialize(). | 39 // called prior to Initialize(). |
41 void StartAudioHashForTesting(); | 40 void StartAudioHashForTesting(); |
42 | 41 |
43 // Returns the MD5 hash of all audio frames seen since the last reset. | 42 // Returns the MD5 hash of all audio frames seen since the last reset. |
44 std::string GetAudioHashForTesting(); | 43 std::string GetAudioHashForTesting(); |
45 | 44 |
46 protected: | 45 protected: |
47 virtual ~NullAudioSink(); | 46 virtual ~NullAudioSink(); |
48 | 47 |
49 private: | 48 private: |
50 // Audio thread task that periodically calls FillBuffer() to consume | 49 // Audio thread task that periodically calls FillBuffer() to consume |
51 // audio data. | 50 // audio data. |
52 void FillBufferTask(); | 51 void FillBufferTask(); |
53 | 52 |
54 void SetPlaying(bool is_playing); | 53 void SetPlaying(bool is_playing); |
55 | 54 |
56 // A buffer passed to FillBuffer to advance playback. | 55 // A buffer passed to FillBuffer to advance playback. |
57 std::vector<float*> audio_data_; | 56 std::vector<float*> audio_data_; |
58 | 57 |
59 AudioParameters params_; | 58 AudioParameters params_; |
60 bool initialized_; | 59 bool initialized_; |
61 float playback_rate_; | |
62 bool playing_; | 60 bool playing_; |
63 RenderCallback* callback_; | 61 RenderCallback* callback_; |
64 | 62 |
65 // Separate thread used to throw away data. | 63 // Separate thread used to throw away data. |
66 base::Thread thread_; | 64 base::Thread thread_; |
67 base::Lock lock_; | 65 base::Lock lock_; |
68 | 66 |
69 // Controls whether or not a running MD5 hash is computed for audio frames. | 67 // Controls whether or not a running MD5 hash is computed for audio frames. |
70 bool hash_audio_for_testing_; | 68 bool hash_audio_for_testing_; |
71 scoped_array<base::MD5Context> md5_channel_contexts_; | 69 scoped_array<base::MD5Context> md5_channel_contexts_; |
72 | 70 |
73 DISALLOW_COPY_AND_ASSIGN(NullAudioSink); | 71 DISALLOW_COPY_AND_ASSIGN(NullAudioSink); |
74 }; | 72 }; |
75 | 73 |
76 } // namespace media | 74 } // namespace media |
77 | 75 |
78 #endif // MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_ | 76 #endif // MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_ |
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