1/* 2 * Copyright (C) 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17import {Timestamp} from './timestamp'; 18 19class ScreenRecordingUtils { 20 // Video time correction epsilon. Without correction, we could display the previous frame. 21 // This correction was already present in the legacy Winscope. 22 private static readonly EPSILON_SECONDS = 0.00001; 23 24 static timestampToVideoTimeSeconds(firstTimestamp: Timestamp, currentTimestamp: Timestamp) { 25 if (firstTimestamp.getType() !== currentTimestamp.getType()) { 26 throw new Error('Attempted to use timestamps with different type'); 27 } 28 const videoTimeSeconds = 29 Number(currentTimestamp.getValueNs() - firstTimestamp.getValueNs()) / 1000000000 + 30 ScreenRecordingUtils.EPSILON_SECONDS; 31 return videoTimeSeconds; 32 } 33} 34 35export {ScreenRecordingUtils}; 36