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 17 package com.android.tv.tuner.source; 18 19 import com.android.tv.common.compat.TvInputConstantCompat; 20 import com.google.android.exoplayer2.upstream.DataSource; 21 22 /** {@link DataSource} for MPEG-TS stream, which will be used by {@link TsExtractor}. */ 23 public abstract class TsDataSource implements DataSource { 24 25 /** 26 * Returns the number of bytes being buffered by {@link TsStreamer} so far. 27 * 28 * @return the buffered position 29 */ getBufferedPosition()30 public long getBufferedPosition() { 31 return 0; 32 } 33 34 /** 35 * Returns the offset position where the last {@link DataSource#read} read. 36 * 37 * @return the last read position 38 */ getLastReadPosition()39 public long getLastReadPosition() { 40 return 0; 41 } 42 43 /** 44 * Shifts start position by the specified offset. Do not call this method when the class already 45 * provided MPEG-TS stream to the extractor. 46 * 47 * @param offset 0 <= offset <= buffered position 48 */ shiftStartPosition(long offset)49 public void shiftStartPosition(long offset) {} 50 getSignalStrength()51 public int getSignalStrength() { 52 return TvInputConstantCompat.SIGNAL_STRENGTH_NOT_USED; 53 } 54 } 55