translate AudioPlayer into English

translate AudioPlayer into English

app/src/main/java/com/frank/ffmpeg/AudioPlayer.java

@@ -5,7 +5,7 @@ import android.media.AudioManager;
 import android.media.AudioTrack;
 
 /**
- * 音频播放器
+ * AudioPlayer: use AudioTrack and OpenSL ES to play audio
  * Created by frank on 2018/2/1.
  */
 
@@ -13,11 +13,13 @@ public class AudioPlayer {
     static {
         System.loadLibrary("media-handle");
     }
-    //调用AudioTrack播放
+
+    //using AudioTrack to play
     public native void play(String audioPath);
-    //调用OpenSL ES播放
+
+    //using OpenSL ES to play
     public native void playAudio(String audioPath);
-    //调用OpenSL ES播放
+
     public native void stop();
 
     public native static void lameInitDefault();
@@ -39,19 +41,20 @@ public class AudioPlayer {
     public native static void lameClose();
 
     /**
-     * 创建一个AudioTrack对象
-     * @param sampleRate 采样率
-     * @param channels 声道布局
+     * Create an AudioTrack instance for JNI call
+     *
+     * @param sampleRate sampleRate
+     * @param channels   channel layout
      * @return AudioTrack
      */
-    public AudioTrack createAudioTrack(int sampleRate, int channels){
+    public AudioTrack createAudioTrack(int sampleRate, int channels) {
         int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
         int channelConfig;
-        if(channels == 1){
+        if (channels == 1) {
             channelConfig = AudioFormat.CHANNEL_OUT_MONO;
-        }else if(channels == 2){
+        } else if (channels == 2) {
             channelConfig = AudioFormat.CHANNEL_OUT_STEREO;
-        }else{
+        } else {
             channelConfig = AudioFormat.CHANNEL_OUT_STEREO;
         }