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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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_ | 5 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_ |
6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_ | 6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_ |
7 | 7 |
8 #include "base/file_descriptor_posix.h" | 8 #include "base/file_descriptor_posix.h" |
9 #include "base/process/process.h" | 9 #include "base/process/process.h" |
10 #include "base/sync_socket.h" | 10 #include "base/sync_socket.h" |
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26 class AudioSyncReader : public media::AudioOutputController::SyncReader { | 26 class AudioSyncReader : public media::AudioOutputController::SyncReader { |
27 public: | 27 public: |
28 AudioSyncReader(base::SharedMemory* shared_memory, | 28 AudioSyncReader(base::SharedMemory* shared_memory, |
29 const media::AudioParameters& params, | 29 const media::AudioParameters& params, |
30 int input_channels); | 30 int input_channels); |
31 | 31 |
32 virtual ~AudioSyncReader(); | 32 virtual ~AudioSyncReader(); |
33 | 33 |
34 // media::AudioOutputController::SyncReader implementations. | 34 // media::AudioOutputController::SyncReader implementations. |
35 virtual void UpdatePendingBytes(uint32 bytes) OVERRIDE; | 35 virtual void UpdatePendingBytes(uint32 bytes) OVERRIDE; |
36 virtual int Read(bool block, | 36 virtual void Read(const media::AudioBus* source, |
37 const media::AudioBus* source, | 37 media::AudioBus* dest) OVERRIDE; |
38 media::AudioBus* dest) OVERRIDE; | |
39 virtual void Close() OVERRIDE; | 38 virtual void Close() OVERRIDE; |
40 | 39 |
41 bool Init(); | 40 bool Init(); |
42 bool PrepareForeignSocketHandle(base::ProcessHandle process_handle, | 41 bool PrepareForeignSocketHandle(base::ProcessHandle process_handle, |
43 #if defined(OS_WIN) | 42 #if defined(OS_WIN) |
44 base::SyncSocket::Handle* foreign_handle); | 43 base::SyncSocket::Handle* foreign_handle); |
45 #else | 44 #else |
46 base::FileDescriptor* foreign_handle); | 45 base::FileDescriptor* foreign_handle); |
47 #endif | 46 #endif |
48 | 47 |
49 private: | 48 private: |
50 // Indicates whether the renderer has data available for reading. | 49 // Blocks until data is ready for reading or a timeout expires. Returns false |
51 bool DataReady(); | 50 // if an error or timeout occurs. |
52 | 51 bool WaitUntilDataIsReady(); |
53 // Blocks until DataReady() is true or a timeout expires. | |
54 void WaitTillDataReady(); | |
55 | 52 |
56 base::SharedMemory* shared_memory_; | 53 base::SharedMemory* shared_memory_; |
57 | 54 |
58 // Number of input channels for synchronized I/O. | 55 // Number of input channels for synchronized I/O. |
59 int input_channels_; | 56 int input_channels_; |
60 | 57 |
61 // Mutes all incoming samples. This is used to prevent audible sound | 58 // Mutes all incoming samples. This is used to prevent audible sound |
62 // during automated testing. | 59 // during automated testing. |
63 bool mute_audio_; | 60 bool mute_audio_; |
64 | 61 |
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76 scoped_ptr<media::AudioBus> input_bus_; | 73 scoped_ptr<media::AudioBus> input_bus_; |
77 | 74 |
78 // Maximum amount of audio data which can be transferred in one Read() call. | 75 // Maximum amount of audio data which can be transferred in one Read() call. |
79 int packet_size_; | 76 int packet_size_; |
80 | 77 |
81 // Track the number of times the renderer missed its real-time deadline and | 78 // Track the number of times the renderer missed its real-time deadline and |
82 // report a UMA stat during destruction. | 79 // report a UMA stat during destruction. |
83 size_t renderer_callback_count_; | 80 size_t renderer_callback_count_; |
84 size_t renderer_missed_callback_count_; | 81 size_t renderer_missed_callback_count_; |
85 | 82 |
| 83 // The maximum amount of time to wait for data from the renderer. Calculated |
| 84 // from the parameters given at construction. |
| 85 const base::TimeDelta maximum_wait_time_; |
| 86 |
| 87 // The index of the audio buffer we're expecting to be sent from the renderer; |
| 88 // used to block with timeout for audio data. |
| 89 uint32 buffer_index_; |
| 90 |
86 DISALLOW_COPY_AND_ASSIGN(AudioSyncReader); | 91 DISALLOW_COPY_AND_ASSIGN(AudioSyncReader); |
87 }; | 92 }; |
88 | 93 |
89 } // namespace content | 94 } // namespace content |
90 | 95 |
91 #endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_ | 96 #endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_ |
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