package com.esa.audio;

import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder;

public class Audio {

    public static final int AUDIO_SOURCE = MediaRecorder.AudioSource.MIC;
    public static final int STREAM_TYPE = AudioManager.STREAM_MUSIC;
    public static final int SAMPLE_RATE_IN_HZ = 8000;// 44100
    public static final int CHANNEL_CONFIG = AudioFormat.CHANNEL_CONFIGURATION_MONO;// AudioTrack和AudioRecord都能用
    public static final int RECORD_CHANNEL_CONFIG = AudioFormat.CHANNEL_IN_MONO;
    public static final int TRACK_CHANNEL_CONFIG = AudioFormat.CHANNEL_OUT_MONO;
    public static final int AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;
    public static final int TRACK_BUFFER_SIZE_IN_BYTES = AudioTrack.getMinBufferSize(SAMPLE_RATE_IN_HZ, TRACK_CHANNEL_CONFIG, AUDIO_FORMAT);
    public static final int RECORD_BUFFER_SIZE_IN_BYTES = AudioRecord.getMinBufferSize(SAMPLE_RATE_IN_HZ, RECORD_CHANNEL_CONFIG, AUDIO_FORMAT);;
    public static final int MODE = AudioTrack.MODE_STREAM;

    private static Audio audio;
    private AudioTrack track = null;
    private AudioRecord record = null;

    public static Audio getAudio() {
        if (audio == null) {
            audio = new Audio();
        }
        return audio;
    }

    public AudioTrack getTrack() {
        if (track == null) {
            track = new AudioTrack(STREAM_TYPE, SAMPLE_RATE_IN_HZ, TRACK_CHANNEL_CONFIG, AUDIO_FORMAT, TRACK_BUFFER_SIZE_IN_BYTES, MODE);
        }
        return track;
    }

    public AudioRecord getRecord() {
        if (record == null) {
            record = new AudioRecord(AUDIO_SOURCE, SAMPLE_RATE_IN_HZ, RECORD_CHANNEL_CONFIG, AUDIO_FORMAT, RECORD_BUFFER_SIZE_IN_BYTES);
        }
        return record;
    }

    public void releaseRecord() {
        if (record != null) {
            record.stop();
            record.release();
        }
        record = null;
    }

    public void releaseTrack() {
        if (track != null) {
            track.stop();
            track.release();
        }
        track = null;
    }
}