OLD | NEW |
1 /* | 1 /* |
2 * Copyright (c) 2016 The WebRTC Project Authors. All rights reserved. | 2 * Copyright (c) 2016 The WebRTC Project Authors. All rights reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #ifndef WEBRTC_BASE_TIMESTAMPALIGNER_H_ | 11 #ifndef WEBRTC_BASE_TIMESTAMPALIGNER_H_ |
12 #define WEBRTC_BASE_TIMESTAMPALIGNER_H_ | 12 #define WEBRTC_BASE_TIMESTAMPALIGNER_H_ |
13 | 13 |
14 #include "webrtc/base/basictypes.h" | 14 #include "webrtc/base/basictypes.h" |
15 #include "webrtc/base/constructormagic.h" | 15 #include "webrtc/base/constructormagic.h" |
16 #include "webrtc/base/optional.h" | 16 #include "webrtc/base/optional.h" |
17 #include "webrtc/base/thread_checker.h" | |
18 | 17 |
19 namespace rtc { | 18 namespace rtc { |
20 | 19 |
| 20 // This class is not thread safe, so all calls to it must be synchronized |
| 21 // externally. |
21 class TimestampAligner { | 22 class TimestampAligner { |
22 public: | 23 public: |
23 TimestampAligner(); | 24 TimestampAligner(); |
24 ~TimestampAligner(); | 25 ~TimestampAligner(); |
25 | 26 |
26 public: | 27 public: |
27 // Update the estimated offset between camera time and system monotonic time. | 28 // Update the estimated offset between camera time and system monotonic time. |
28 int64_t UpdateOffset(int64_t camera_time_us, int64_t system_time_us); | 29 int64_t UpdateOffset(int64_t camera_time_us, int64_t system_time_us); |
29 | 30 |
30 int64_t ClipTimestamp(int64_t filtered_time_us, int64_t system_time_us); | 31 int64_t ClipTimestamp(int64_t filtered_time_us, int64_t system_time_us); |
31 | 32 |
32 private: | 33 private: |
33 rtc::ThreadChecker thread_checker_; | |
34 | |
35 // State for the timestamp translation. | 34 // State for the timestamp translation. |
36 int frames_seen_; | 35 int frames_seen_; |
37 // Estimated offset between camera time and system monotonic time. | 36 // Estimated offset between camera time and system monotonic time. |
38 int64_t offset_us_; | 37 int64_t offset_us_; |
39 | 38 |
40 // State for timestamp clipping, applied after the filter, to ensure | 39 // State for timestamp clipping, applied after the filter, to ensure |
41 // that translated timestamps are monotonic and not in the future. | 40 // that translated timestamps are monotonic and not in the future. |
42 // Subtracted from the translated timestamps. | 41 // Subtracted from the translated timestamps. |
43 int64_t clip_bias_us_; | 42 int64_t clip_bias_us_; |
44 rtc::Optional<int64_t> prev_translated_time_us_; | 43 rtc::Optional<int64_t> prev_translated_time_us_; |
45 RTC_DISALLOW_COPY_AND_ASSIGN(TimestampAligner); | 44 RTC_DISALLOW_COPY_AND_ASSIGN(TimestampAligner); |
46 }; | 45 }; |
47 | 46 |
48 } // namespace rtc | 47 } // namespace rtc |
49 | 48 |
50 #endif // WEBRTC_BASE_TIMESTAMPALIGNER_H_ | 49 #endif // WEBRTC_BASE_TIMESTAMPALIGNER_H_ |
OLD | NEW |