1 /* 2 * Copyright (C) 2017 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.exoplayer.audio; 18 19 import com.google.android.exoplayer.ExoPlaybackException; 20 import com.google.android.exoplayer.MediaFormat; 21 import com.google.android.exoplayer.SampleHolder; 22 import java.nio.ByteBuffer; 23 24 /** A base class for audio decoders. */ 25 public abstract class AudioDecoder { 26 27 /** 28 * Decodes an audio sample. 29 * 30 * @param sampleHolder a holder that contains the sample data and corresponding metadata 31 */ decode(SampleHolder sampleHolder)32 public abstract void decode(SampleHolder sampleHolder); 33 34 /** Returns a decoded sample from decoder. */ getDecodedSample()35 public abstract ByteBuffer getDecodedSample(); 36 37 /** Returns the presentation time for the decoded sample. */ getDecodedTimeUs()38 public abstract long getDecodedTimeUs(); 39 40 /** 41 * Clear previous decode state if any. Prepares to decode samples of the specified encoding. 42 * This method should be called before using decode. 43 * 44 * @param mimeType audio encoding 45 */ resetDecoderState(String mimeType)46 public abstract void resetDecoderState(String mimeType); 47 48 /** Releases all the resource. */ release()49 public abstract void release(); 50 51 /** 52 * Init decoder if needed. 53 * 54 * @param format the format used to initialize decoder 55 */ maybeInitDecoder(MediaFormat format)56 public void maybeInitDecoder(MediaFormat format) throws ExoPlaybackException { 57 // Do nothing. 58 } 59 60 /** Returns input buffer that will be used in decoder. */ getInputBuffer()61 public ByteBuffer getInputBuffer() { 62 return null; 63 } 64 65 /** Returns the output format. */ getOutputFormat()66 public android.media.MediaFormat getOutputFormat() { 67 return null; 68 } 69 } 70