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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_ANIMATED_CONTENT_SAMPLER_H_ | 5 #ifndef MEDIA_CAPTURE_CONTENT_ANIMATED_CONTENT_SAMPLER_H_ |
6 #define MEDIA_CAPTURE_CONTENT_ANIMATED_CONTENT_SAMPLER_H_ | 6 #define MEDIA_CAPTURE_CONTENT_ANIMATED_CONTENT_SAMPLER_H_ |
7 | 7 |
8 #include <deque> | 8 #include <deque> |
9 | 9 |
10 #include "base/time/time.h" | 10 #include "base/time/time.h" |
11 #include "media/capture/capture_export.h" | 11 #include "media/base/media_export.h" |
12 #include "ui/gfx/geometry/rect.h" | 12 #include "ui/gfx/geometry/rect.h" |
13 | 13 |
14 namespace media { | 14 namespace media { |
15 | 15 |
16 // Analyzes a sequence of events to detect the presence of constant frame rate | 16 // Analyzes a sequence of events to detect the presence of constant frame rate |
17 // animated content. In the case where there are multiple regions of animated | 17 // animated content. In the case where there are multiple regions of animated |
18 // content, AnimatedContentSampler will propose sampling the one having the | 18 // content, AnimatedContentSampler will propose sampling the one having the |
19 // largest "smoothness" impact, according to human perception (e.g., a 24 FPS | 19 // largest "smoothness" impact, according to human perception (e.g., a 24 FPS |
20 // video versus a 60 FPS busy spinner). | 20 // video versus a 60 FPS busy spinner). |
21 // | 21 // |
22 // In addition, AnimatedContentSampler will provide rewritten frame timestamps, | 22 // In addition, AnimatedContentSampler will provide rewritten frame timestamps, |
23 // for downstream consumers, that are "truer" to the source content than to the | 23 // for downstream consumers, that are "truer" to the source content than to the |
24 // local presentation hardware. | 24 // local presentation hardware. |
25 class CAPTURE_EXPORT AnimatedContentSampler { | 25 class MEDIA_EXPORT AnimatedContentSampler { |
26 public: | 26 public: |
27 explicit AnimatedContentSampler(base::TimeDelta min_capture_period); | 27 explicit AnimatedContentSampler(base::TimeDelta min_capture_period); |
28 ~AnimatedContentSampler(); | 28 ~AnimatedContentSampler(); |
29 | 29 |
30 // Get/Set the target sampling period. This is used to determine whether to | 30 // Get/Set the target sampling period. This is used to determine whether to |
31 // subsample the frames of animated content. | 31 // subsample the frames of animated content. |
32 base::TimeDelta target_sampling_period() const { | 32 base::TimeDelta target_sampling_period() const { |
33 return target_sampling_period_; | 33 return target_sampling_period_; |
34 } | 34 } |
35 void SetTargetSamplingPeriod(base::TimeDelta period); | 35 void SetTargetSamplingPeriod(base::TimeDelta period); |
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148 // the bucket when at least a full sampling period's worth are present. | 148 // the bucket when at least a full sampling period's worth are present. |
149 base::TimeDelta token_bucket_; | 149 base::TimeDelta token_bucket_; |
150 | 150 |
151 // The rewritten frame timestamp for the latest event. | 151 // The rewritten frame timestamp for the latest event. |
152 base::TimeTicks frame_timestamp_; | 152 base::TimeTicks frame_timestamp_; |
153 }; | 153 }; |
154 | 154 |
155 } // namespace media | 155 } // namespace media |
156 | 156 |
157 #endif // MEDIA_CAPTURE_CONTENT_ANIMATED_CONTENT_SAMPLER_H_ | 157 #endif // MEDIA_CAPTURE_CONTENT_ANIMATED_CONTENT_SAMPLER_H_ |
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