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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_AUDIO_AUDIO_OUTPUT_RESAMPLER_H_ | 5 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_RESAMPLER_H_ |
6 #define MEDIA_AUDIO_AUDIO_OUTPUT_RESAMPLER_H_ | 6 #define MEDIA_AUDIO_AUDIO_OUTPUT_RESAMPLER_H_ |
7 | 7 |
8 #include <map> | 8 #include <map> |
9 | 9 |
10 #include "base/macros.h" | 10 #include "base/macros.h" |
11 #include "base/memory/ref_counted.h" | 11 #include "base/memory/ref_counted.h" |
12 #include "base/time/time.h" | 12 #include "base/time/time.h" |
13 #include "base/timer/timer.h" | 13 #include "base/timer/timer.h" |
14 #include "media/audio/audio_io.h" | 14 #include "media/audio/audio_io.h" |
15 #include "media/audio/audio_manager.h" | 15 #include "media/audio/audio_manager.h" |
16 #include "media/audio/audio_output_dispatcher_impl.h" | 16 #include "media/audio/audio_output_dispatcher_impl.h" |
17 #include "media/base/audio_parameters.h" | 17 #include "media/base/audio_parameters.h" |
18 | 18 |
19 namespace media { | 19 namespace media { |
20 | 20 |
21 class OnMoreDataConverter; | 21 class OnMoreDataConverter; |
22 | 22 |
23 // AudioOutputResampler is a browser-side resampling and buffering solution | 23 // AudioOutputResampler is a browser-side resampling and buffering solution |
24 // which ensures audio data is always output at given parameters. See the | 24 // which ensures audio data is always output at given parameters. See the |
25 // AudioConverter class for details on the conversion process. | 25 // AudioConverter class for details on the conversion process. |
26 // | 26 // |
27 // AOR works by intercepting the AudioSourceCallback provided to StartStream() | 27 // AOR works by intercepting the AudioSourceCallback provided to StartStream() |
28 // and redirecting it through an AudioConverter instance. |total_bytes_delay| | 28 // and redirecting it through an AudioConverter instance. |
29 // is adjusted for buffer delay caused by the conversion process. | |
30 // | 29 // |
31 // AOR will automatically fall back from AUDIO_PCM_LOW_LATENCY to | 30 // AOR will automatically fall back from AUDIO_PCM_LOW_LATENCY to |
32 // AUDIO_PCM_LINEAR if the output device fails to open at the requested output | 31 // AUDIO_PCM_LINEAR if the output device fails to open at the requested output |
33 // parameters. If opening still fails, it will fallback to AUDIO_FAKE. | 32 // parameters. If opening still fails, it will fallback to AUDIO_FAKE. |
34 class MEDIA_EXPORT AudioOutputResampler : public AudioOutputDispatcher { | 33 class MEDIA_EXPORT AudioOutputResampler : public AudioOutputDispatcher { |
35 public: | 34 public: |
36 AudioOutputResampler(AudioManager* audio_manager, | 35 AudioOutputResampler(AudioManager* audio_manager, |
37 const AudioParameters& input_params, | 36 const AudioParameters& input_params, |
38 const AudioParameters& output_params, | 37 const AudioParameters& output_params, |
39 const std::string& output_device_id, | 38 const std::string& output_device_id, |
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88 // have been created within |close_delay_|. Without this, audio may be lost | 87 // have been created within |close_delay_|. Without this, audio may be lost |
89 // to a fake stream indefinitely for transient errors. | 88 // to a fake stream indefinitely for transient errors. |
90 base::Timer reinitialize_timer_; | 89 base::Timer reinitialize_timer_; |
91 | 90 |
92 DISALLOW_COPY_AND_ASSIGN(AudioOutputResampler); | 91 DISALLOW_COPY_AND_ASSIGN(AudioOutputResampler); |
93 }; | 92 }; |
94 | 93 |
95 } // namespace media | 94 } // namespace media |
96 | 95 |
97 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_RESAMPLER_H_ | 96 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_RESAMPLER_H_ |
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