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 android.support.car.media; 17 18 import android.media.AudioRecord; 19 import android.support.car.CarNotConnectedException; 20 21 /** 22 * Enables applications to use the microphone. 23 */ 24 public abstract class CarAudioRecord { 25 /** 26 * Get the buffer size specified in {@link CarAudioManager#createCarAudioRecord(int)}. 27 * @return Buffer size in bytes. 28 */ 29 public abstract int getBufferSize() throws CarNotConnectedException; 30 31 /** 32 * Start audio recording. 33 */ 34 public abstract void startRecording() throws CarNotConnectedException; 35 36 /** 37 * Stop audio recording. Calling stop multiple times is a safe operation. 38 */ 39 public abstract void stop(); 40 41 /** 42 * Release native resource allocated for this instance. {@link CarAudioRecord} can no longer 43 * be used after release is called. 44 */ 45 public abstract void release(); 46 47 /** See {@link AudioRecord#getRecordingState() }. */ 48 public abstract int getRecordingState() throws CarNotConnectedException; 49 50 /** See {@link AudioRecord#getState() }. */ 51 public abstract int getState() throws CarNotConnectedException; 52 53 /** See {@link AudioRecord#getAudioSessionId() }. */ 54 public abstract int getAudioSessionId() throws CarNotConnectedException; 55 56 /** 57 * Read recorded audio. Be sure to start audio recording with {@link #startRecording()} 58 * before this. 59 * @param audioData 60 * @param offsetInBytes 61 * @param sizeInBytes 62 * @return Number of bytes read. Returns {@link android.media.AudioRecord#ERROR} on error. 63 * @throws IllegalStateException if audio recording was not started. 64 */ 65 public abstract int read(byte[] audioData, int offsetInBytes, int sizeInBytes) 66 throws IllegalStateException, CarNotConnectedException; 67 } 68
