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 23 import java.nio.ByteBuffer; 24 25 /** A base class for audio decoders. */ 26 public abstract class AudioDecoder { 27 28 /** 29 * Decodes an audio sample. 30 * 31 * @param sampleHolder a holder that contains the sample data and corresponding metadata 32 */ decode(SampleHolder sampleHolder)33 public abstract void decode(SampleHolder sampleHolder); 34 35 /** Returns a decoded sample from decoder. */ getDecodedSample()36 public abstract ByteBuffer getDecodedSample(); 37 38 /** Returns the presentation time for the decoded sample. */ getDecodedTimeUs()39 public abstract long getDecodedTimeUs(); 40 41 /** 42 * Clear previous decode state if any. Prepares to decode samples of the specified encoding. 43 * This method should be called before using decode. 44 * 45 * @param mime audio encoding 46 */ resetDecoderState(String mimeType)47 public abstract void resetDecoderState(String mimeType); 48 49 /** Releases all the resource. */ release()50 public abstract void release(); 51 52 /** 53 * Init decoder if needed. 54 * 55 * @param format the format used to initialize decoder 56 */ maybeInitDecoder(MediaFormat format)57 public void maybeInitDecoder(MediaFormat format) throws ExoPlaybackException { 58 // Do nothing. 59 } 60 61 /** Returns input buffer that will be used in decoder. */ getInputBuffer()62 public ByteBuffer getInputBuffer() { 63 return null; 64 } 65 66 /** Returns the output format. */ getOutputFormat()67 public android.media.MediaFormat getOutputFormat() { 68 return null; 69 } 70 } 71