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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 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 // AudioRendererBase takes care of the tricky queuing work and provides simple | 5 // AudioRendererBase takes care of the tricky queuing work and provides simple |
6 // methods for subclasses to peek and poke at audio data. In addition to | 6 // methods for subclasses to peek and poke at audio data. In addition to |
7 // AudioRenderer interface methods this classes doesn't implement, subclasses | 7 // AudioRenderer interface methods this classes doesn't implement, subclasses |
8 // must also implement the following methods: | 8 // must also implement the following methods: |
9 // OnInitialized | 9 // OnInitialized |
10 // OnStop | 10 // OnStop |
11 // | 11 // |
12 // The general assumption is that subclasses start a callback-based audio thread | 12 // The general assumption is that subclasses start a callback-based audio thread |
13 // which needs to be filled with decoded audio data. AudioDecoderBase provides | 13 // which needs to be filled with decoded audio data. AudioDecoderBase provides |
14 // FillBuffer which handles filling the provided buffer, dequeuing items, | 14 // FillBuffer which handles filling the provided buffer, dequeuing items, |
15 // scheduling additional reads and updating the clock. In a sense, | 15 // scheduling additional reads and updating the clock. In a sense, |
16 // AudioRendererBase is the producer and the subclass is the consumer. | 16 // AudioRendererBase is the producer and the subclass is the consumer. |
17 | 17 |
18 #ifndef MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_ | 18 #ifndef MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_ |
19 #define MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_ | 19 #define MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_ |
20 | 20 |
21 #include <deque> | 21 #include <deque> |
22 | 22 |
23 #include "base/lock.h" | 23 #include "base/synchronization/lock.h" |
24 #include "media/base/buffers.h" | 24 #include "media/base/buffers.h" |
25 #include "media/base/filters.h" | 25 #include "media/base/filters.h" |
26 #include "media/filters/audio_renderer_algorithm_base.h" | 26 #include "media/filters/audio_renderer_algorithm_base.h" |
27 | 27 |
28 namespace media { | 28 namespace media { |
29 | 29 |
30 class AudioRendererBase : public AudioRenderer { | 30 class AudioRendererBase : public AudioRenderer { |
31 public: | 31 public: |
32 AudioRendererBase(); | 32 AudioRendererBase(); |
33 virtual ~AudioRendererBase(); | 33 virtual ~AudioRendererBase(); |
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95 // | 95 // |
96 // Safe to call from any thread. | 96 // Safe to call from any thread. |
97 void ScheduleRead_Locked(); | 97 void ScheduleRead_Locked(); |
98 | 98 |
99 // Audio decoder. | 99 // Audio decoder. |
100 scoped_refptr<AudioDecoder> decoder_; | 100 scoped_refptr<AudioDecoder> decoder_; |
101 | 101 |
102 // Algorithm for scaling audio. | 102 // Algorithm for scaling audio. |
103 scoped_ptr<AudioRendererAlgorithmBase> algorithm_; | 103 scoped_ptr<AudioRendererAlgorithmBase> algorithm_; |
104 | 104 |
105 Lock lock_; | 105 base::Lock lock_; |
106 | 106 |
107 // Simple state tracking variable. | 107 // Simple state tracking variable. |
108 enum State { | 108 enum State { |
109 kUninitialized, | 109 kUninitialized, |
110 kPaused, | 110 kPaused, |
111 kSeeking, | 111 kSeeking, |
112 kPlaying, | 112 kPlaying, |
113 kStopped, | 113 kStopped, |
114 kError, | 114 kError, |
115 }; | 115 }; |
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135 scoped_ptr<FilterCallback> seek_callback_; | 135 scoped_ptr<FilterCallback> seek_callback_; |
136 | 136 |
137 base::TimeDelta seek_timestamp_; | 137 base::TimeDelta seek_timestamp_; |
138 | 138 |
139 DISALLOW_COPY_AND_ASSIGN(AudioRendererBase); | 139 DISALLOW_COPY_AND_ASSIGN(AudioRendererBase); |
140 }; | 140 }; |
141 | 141 |
142 } // namespace media | 142 } // namespace media |
143 | 143 |
144 #endif // MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_ | 144 #endif // MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_ |
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