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Side by Side Diff: media/audio/simple_sources.h

Issue 2140001: Removed PushSource::Packet. SeekableBuffer.current_time() fixed to return (Closed)
Patch Set: - Created 10 years, 6 months ago
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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 #ifndef MEDIA_AUDIO_SIMPLE_SOURCES_H_ 5 #ifndef MEDIA_AUDIO_SIMPLE_SOURCES_H_
6 #define MEDIA_AUDIO_SIMPLE_SOURCES_H_ 6 #define MEDIA_AUDIO_SIMPLE_SOURCES_H_
7 7
8 #include <list> 8 #include <list>
9 9
10 #include "base/lock.h" 10 #include "base/lock.h"
11 #include "media/audio/audio_output.h" 11 #include "media/audio/audio_output.h"
12 #include "media/base/seekable_buffer.h"
12 13
13 // An audio source that produces a pure sinusoidal tone. 14 // An audio source that produces a pure sinusoidal tone.
14 class SineWaveAudioSource : public AudioOutputStream::AudioSourceCallback { 15 class SineWaveAudioSource : public AudioOutputStream::AudioSourceCallback {
15 public: 16 public:
16 enum Format { 17 enum Format {
17 FORMAT_8BIT_LINEAR_PCM, 18 FORMAT_8BIT_LINEAR_PCM,
18 FORMAT_16BIT_LINEAR_PCM, 19 FORMAT_16BIT_LINEAR_PCM,
19 }; 20 };
20 // |channels| is the number of audio channels, |freq| is the frequency in 21 // |channels| is the number of audio channels, |freq| is the frequency in
21 // hertz and it has to be less than half of the sampling frequency 22 // hertz and it has to be less than half of the sampling frequency
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70 // Implementation of AudioSourceCallback. 71 // Implementation of AudioSourceCallback.
71 virtual uint32 OnMoreData(AudioOutputStream* stream, 72 virtual uint32 OnMoreData(AudioOutputStream* stream,
72 void* dest, uint32 max_size, uint32 pending_bytes); 73 void* dest, uint32 max_size, uint32 pending_bytes);
73 virtual void OnClose(AudioOutputStream* stream); 74 virtual void OnClose(AudioOutputStream* stream);
74 virtual void OnError(AudioOutputStream* stream, int code); 75 virtual void OnError(AudioOutputStream* stream, int code);
75 76
76 // Discard all buffered data and reset to initial state. 77 // Discard all buffered data and reset to initial state.
77 void ClearAll(); 78 void ClearAll();
78 79
79 private: 80 private:
80 // Defines the unit of playback. We own the memory pointed by |buffer|.
81 struct Packet {
82 char* buffer;
83 uint32 size;
84 };
85
86 // Free acquired resources. 81 // Free acquired resources.
87 void CleanUp(); 82 void CleanUp();
88 83
89 typedef std::list<Packet> PacketList; 84 media::SeekableBuffer buffer_;
90 PacketList packets_; 85 // Serialize access to |buffer_| using this lock.
91 uint32 buffered_bytes_; 86 Lock buffer_lock_;
92 uint32 front_buffer_consumed_;
93 // Serialize access to packets_ and buffered_bytes_ using this lock.
94 Lock lock_;
95 }; 87 };
96 88
97 #endif // MEDIA_AUDIO_SIMPLE_SOURCES_H_ 89 #endif // MEDIA_AUDIO_SIMPLE_SOURCES_H_
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