Android录制和播放AudioRecord和AudioTrack

1package com.esa.audio;
2
3import android.media.AudioFormat;
4import android.media.AudioManager;
5import android.media.AudioRecord;
6import android.media.AudioTrack;
7import android.media.MediaRecorder;
8
9public class Audio {
10
11	public static final int AUDIO_SOURCE = MediaRecorder.AudioSource.MIC;
12	public static final int STREAM_TYPE = AudioManager.STREAM_MUSIC;
13	public static final int SAMPLE_RATE_IN_HZ = 8000;// 44100
14	public static final int CHANNEL_CONFIG = AudioFormat.CHANNEL_CONFIGURATION_MONO;// AudioTrack和AudioRecord都能用
15	public static final int RECORD_CHANNEL_CONFIG = AudioFormat.CHANNEL_IN_MONO;
16	public static final int TRACK_CHANNEL_CONFIG = AudioFormat.CHANNEL_OUT_MONO;
17	public static final int AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;
18	public static final int TRACK_BUFFER_SIZE_IN_BYTES = AudioTrack.getMinBufferSize(SAMPLE_RATE_IN_HZ, TRACK_CHANNEL_CONFIG, AUDIO_FORMAT);
19	public static final int RECORD_BUFFER_SIZE_IN_BYTES = AudioRecord.getMinBufferSize(SAMPLE_RATE_IN_HZ, RECORD_CHANNEL_CONFIG, AUDIO_FORMAT);;
20	public static final int MODE = AudioTrack.MODE_STREAM;
21
22	private static Audio audio;
23	private AudioTrack track = null;
24	private AudioRecord record = null;
25
26	public static Audio getAudio() {
27		if (audio == null) {
28			audio = new Audio();
29		}
30		return audio;
31	}
32
33	public AudioTrack getTrack() {
34		if (track == null) {
35			track = new AudioTrack(STREAM_TYPE, SAMPLE_RATE_IN_HZ, TRACK_CHANNEL_CONFIG, AUDIO_FORMAT, TRACK_BUFFER_SIZE_IN_BYTES, MODE);
36		}
37		return track;
38	}
39
40	public AudioRecord getRecord() {
41		if (record == null) {
42			record = new AudioRecord(AUDIO_SOURCE, SAMPLE_RATE_IN_HZ, RECORD_CHANNEL_CONFIG, AUDIO_FORMAT, RECORD_BUFFER_SIZE_IN_BYTES);
43		}
44		return record;
45	}
46
47	public void releaseRecord() {
48		if (record != null) {
49			record.stop();
50			record.release();
51		}
52		record = null;
53	}
54
55	public void releaseTrack() {
56		if (track != null) {
57			track.stop();
58			track.release();
59		}
60		track = null;
61	}
62}