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1 // Copyright (c) 2015 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2015 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_CAPTURE_CONTENT_SMOOTH_EVENT_SAMPLER_H_ | 5 #ifndef MEDIA_CAPTURE_CONTENT_SMOOTH_EVENT_SAMPLER_H_ |
6 #define MEDIA_CAPTURE_CONTENT_SMOOTH_EVENT_SAMPLER_H_ | 6 #define MEDIA_CAPTURE_CONTENT_SMOOTH_EVENT_SAMPLER_H_ |
7 | 7 |
8 #include "base/macros.h" | 8 #include "base/macros.h" |
9 #include "base/time/time.h" | 9 #include "base/time/time.h" |
10 #include "media/base/media_export.h" | 10 #include "media/capture/capture_export.h" |
11 | 11 |
12 namespace media { | 12 namespace media { |
13 | 13 |
14 // Filters a sequence of events to achieve a target frequency. | 14 // Filters a sequence of events to achieve a target frequency. |
15 class MEDIA_EXPORT SmoothEventSampler { | 15 class CAPTURE_EXPORT SmoothEventSampler { |
16 public: | 16 public: |
17 explicit SmoothEventSampler(base::TimeDelta min_capture_period); | 17 explicit SmoothEventSampler(base::TimeDelta min_capture_period); |
18 | 18 |
19 // Get/Set minimum capture period. When setting a new value, the state of the | 19 // Get/Set minimum capture period. When setting a new value, the state of the |
20 // sampler is retained so that sampling will continue smoothly. | 20 // sampler is retained so that sampling will continue smoothly. |
21 base::TimeDelta min_capture_period() const { return min_capture_period_; } | 21 base::TimeDelta min_capture_period() const { return min_capture_period_; } |
22 void SetMinCapturePeriod(base::TimeDelta p); | 22 void SetMinCapturePeriod(base::TimeDelta p); |
23 | 23 |
24 // Add a new event to the event history, and consider whether it ought to be | 24 // Add a new event to the event history, and consider whether it ought to be |
25 // sampled. The event is not recorded as a sample until RecordSample() is | 25 // sampled. The event is not recorded as a sample until RecordSample() is |
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45 base::TimeTicks current_event_; | 45 base::TimeTicks current_event_; |
46 base::TimeTicks last_sample_; | 46 base::TimeTicks last_sample_; |
47 base::TimeDelta token_bucket_; | 47 base::TimeDelta token_bucket_; |
48 | 48 |
49 DISALLOW_COPY_AND_ASSIGN(SmoothEventSampler); | 49 DISALLOW_COPY_AND_ASSIGN(SmoothEventSampler); |
50 }; | 50 }; |
51 | 51 |
52 } // namespace media | 52 } // namespace media |
53 | 53 |
54 #endif // MEDIA_CAPTURE_CONTENT_SMOOTH_EVENT_SAMPLER_H_ | 54 #endif // MEDIA_CAPTURE_CONTENT_SMOOTH_EVENT_SAMPLER_H_ |
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