1 /* 2 * Copyright (C) 2016 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 package com.google.android.exoplayer2.metadata.scte35; 17 18 import android.os.Parcel; 19 import com.google.android.exoplayer2.C; 20 import com.google.android.exoplayer2.util.ParsableByteArray; 21 import com.google.android.exoplayer2.util.TimestampAdjuster; 22 23 /** 24 * Represents a time signal command as defined in SCTE35, Section 9.3.4. 25 */ 26 public final class TimeSignalCommand extends SpliceCommand { 27 28 public final long ptsTime; 29 public final long playbackPositionUs; 30 TimeSignalCommand(long ptsTime, long playbackPositionUs)31 private TimeSignalCommand(long ptsTime, long playbackPositionUs) { 32 this.ptsTime = ptsTime; 33 this.playbackPositionUs = playbackPositionUs; 34 } 35 parseFromSection(ParsableByteArray sectionData, long ptsAdjustment, TimestampAdjuster timestampAdjuster)36 /* package */ static TimeSignalCommand parseFromSection(ParsableByteArray sectionData, 37 long ptsAdjustment, TimestampAdjuster timestampAdjuster) { 38 long ptsTime = parseSpliceTime(sectionData, ptsAdjustment); 39 long playbackPositionUs = timestampAdjuster.adjustTsTimestamp(ptsTime); 40 return new TimeSignalCommand(ptsTime, playbackPositionUs); 41 } 42 43 /** 44 * Parses pts_time from splice_time(), defined in Section 9.4.1. Returns {@link C#TIME_UNSET}, if 45 * time_specified_flag is false. 46 * 47 * @param sectionData The section data from which the pts_time is parsed. 48 * @param ptsAdjustment The pts adjustment provided by the splice info section header. 49 * @return The pts_time defined by splice_time(), or {@link C#TIME_UNSET}, if time_specified_flag 50 * is false. 51 */ parseSpliceTime(ParsableByteArray sectionData, long ptsAdjustment)52 /* package */ static long parseSpliceTime(ParsableByteArray sectionData, long ptsAdjustment) { 53 long firstByte = sectionData.readUnsignedByte(); 54 long ptsTime = C.TIME_UNSET; 55 if ((firstByte & 0x80) != 0 /* time_specified_flag */) { 56 // See SCTE35 9.2.1 for more information about pts adjustment. 57 ptsTime = (firstByte & 0x01) << 32 | sectionData.readUnsignedInt(); 58 ptsTime += ptsAdjustment; 59 ptsTime &= 0x1FFFFFFFFL; 60 } 61 return ptsTime; 62 } 63 64 // Parcelable implementation. 65 66 @Override writeToParcel(Parcel dest, int flags)67 public void writeToParcel(Parcel dest, int flags) { 68 dest.writeLong(ptsTime); 69 dest.writeLong(playbackPositionUs); 70 } 71 72 public static final Creator<TimeSignalCommand> CREATOR = 73 new Creator<TimeSignalCommand>() { 74 75 @Override 76 public TimeSignalCommand createFromParcel(Parcel in) { 77 return new TimeSignalCommand(in.readLong(), in.readLong()); 78 } 79 80 @Override 81 public TimeSignalCommand[] newArray(int size) { 82 return new TimeSignalCommand[size]; 83 } 84 85 }; 86 87 } 88