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