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