| /* |
| * Copyright (c) 2016 The WebRTC Project Authors. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef WEBRTC_BASE_TIMESTAMPALIGNER_H_ |
| #define WEBRTC_BASE_TIMESTAMPALIGNER_H_ |
| |
| #include "webrtc/base/basictypes.h" |
| #include "webrtc/base/constructormagic.h" |
| #include "webrtc/base/optional.h" |
| |
| namespace rtc { |
| |
| // This class is not thread safe, so all calls to it must be synchronized |
| // externally. |
| class TimestampAligner { |
| public: |
| TimestampAligner(); |
| ~TimestampAligner(); |
| |
| public: |
| // Update the estimated offset between camera time and system monotonic time. |
| int64_t UpdateOffset(int64_t camera_time_us, int64_t system_time_us); |
| |
| int64_t ClipTimestamp(int64_t filtered_time_us, int64_t system_time_us); |
| |
| private: |
| // State for the timestamp translation. |
| int frames_seen_; |
| // Estimated offset between camera time and system monotonic time. |
| int64_t offset_us_; |
| |
| // State for timestamp clipping, applied after the filter, to ensure |
| // that translated timestamps are monotonic and not in the future. |
| // Subtracted from the translated timestamps. |
| int64_t clip_bias_us_; |
| rtc::Optional<int64_t> prev_translated_time_us_; |
| RTC_DISALLOW_COPY_AND_ASSIGN(TimestampAligner); |
| }; |
| |
| } // namespace rtc |
| |
| #endif // WEBRTC_BASE_TIMESTAMPALIGNER_H_ |