diff --git a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioRecordController.kt b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioRecordController.kt
new file mode 100644
index 0000000..8db8da8
--- /dev/null
+++ b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioRecordController.kt
@@ -0,0 +1,134 @@
+package com.frank.androidmedia.controller
+
+import android.media.AudioFormat
+import android.media.AudioRecord
+import android.media.MediaRecorder
+import android.util.Log
+import com.frank.androidmedia.util.WavUtil
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+import java.lang.Exception
+
+/**
+ * Using AudioRecord to record an audio segment.
+ * See also MediaRecord, which used to record media.
+ *
+ * @author frank
+ * @date 2022/3/22
+ */
+open class AudioRecordController {
+
+    companion object {
+        val TAG: String = AudioTrackController::class.java.simpleName
+    }
+
+    private var minBufferSize = 0
+    private var mAudioRecord: AudioRecord? = null
+    private var mRecordThread: RecordThread? = null
+
+    private fun initAudioRecord() {
+        val sampleRate    = 44100
+        val audioFormat   = AudioFormat.ENCODING_PCM_16BIT
+        val channelConfig = AudioFormat.CHANNEL_IN_STEREO
+        minBufferSize     = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat)
+        mAudioRecord = AudioRecord( MediaRecorder.AudioSource.MIC,
+                                    sampleRate,
+                                    channelConfig,
+                                    audioFormat,
+                                    minBufferSize)
+    }
+
+    private class RecordThread(recordPath: String, audioRecord: AudioRecord, bufferSize: Int) : Thread() {
+
+        var isRecording = false
+        private val lock = Object()
+        private var mPath: String? = null
+        private lateinit var mData: ByteArray
+        private var mBufferSize = 0
+        private var mAudioRecord: AudioRecord? = null
+        private var mOutputStream: FileOutputStream? = null
+
+        init {
+            mPath = recordPath
+            isRecording = true
+            mBufferSize = bufferSize
+            mAudioRecord = audioRecord
+        }
+
+        override fun run() {
+            super.run()
+
+            try {
+                mData = ByteArray(mBufferSize)
+                mOutputStream = FileOutputStream(mPath)
+            } catch (e: Exception) {
+                Log.e(TAG, "open file error=$e")
+                isRecording = false
+            }
+
+            while (isRecording) {
+                synchronized(lock) {
+                    if (isRecording) {
+                        val size: Int = mAudioRecord?.read(mData, 0, mBufferSize)!!
+                        if (size > 0) {
+                            mOutputStream?.write(mData, 0, size)
+                        } else if (size < 0) {
+                            Log.e(TAG, "read data error, size=$size")
+                        }
+                    }
+                }
+            }
+
+            if (mOutputStream != null) {
+                try {
+                    mOutputStream?.close()
+                } catch (e: IOException) {
+                    e.printStackTrace()
+                }
+            }
+        }
+    }
+
+    fun startRecord(recordPath: String) {
+        if (mAudioRecord == null) {
+            try {
+                initAudioRecord()
+            } catch (e: Exception) {
+                Log.e(TAG, "init AudioRecord error=$e")
+                return
+            }
+        }
+
+        if (mAudioRecord!!.recordingState == AudioRecord.RECORDSTATE_RECORDING) {
+            Log.e(TAG, "is recording audio...")
+            return
+        }
+
+        let {
+            Log.i(TAG, "start record...")
+            mAudioRecord!!.startRecording()
+            mRecordThread = RecordThread(recordPath, mAudioRecord!!, minBufferSize)
+            mRecordThread!!.start()
+        }
+    }
+
+    fun stopRecord() {
+        Log.i(TAG, "stop record...")
+        if (mRecordThread != null) {
+            mRecordThread!!.isRecording = false
+            mRecordThread!!.interrupt()
+            mRecordThread = null
+        }
+        if (mAudioRecord != null) {
+            mAudioRecord!!.stop()
+        }
+    }
+
+    fun release() {
+        if (mAudioRecord != null) {
+            mAudioRecord!!.release()
+            mAudioRecord = null
+        }
+    }
+}
\ No newline at end of file
diff --git a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioTrackController.kt b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioTrackController.kt
index 82ea682..5d19198 100644
--- a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioTrackController.kt
+++ b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioTrackController.kt
@@ -84,8 +84,6 @@ open class AudioTrackController {
             audioTrack = AudioTrack(audioAttributes, audioFormat,
                     bufferSize, AudioTrack.MODE_STREAM, AudioManager.AUDIO_SESSION_ID_GENERATE)
             audioTrack!!.play()
-//            audioTrack!!.audioSessionId
-//            audioTrack!!.attachAuxEffect()
         } catch (e: Exception) {
             Log.e(TAG, "initAudioTrack err=$e")
             return false
@@ -164,4 +162,16 @@ open class AudioTrackController {
         running?.set(false)
     }
 
+    fun getAudioSessionId(): Int {
+        if (audioTrack == null)
+            return 0
+        return audioTrack!!.audioSessionId
+    }
+
+    fun attachAudioEffect(effectId: Int) {
+        if (audioTrack == null)
+            return
+        audioTrack!!.attachAuxEffect(effectId)
+    }
+
 }
\ No newline at end of file
diff --git a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaPlayController.kt b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaPlayController.kt
index 938e54f..4c26db9 100644
--- a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaPlayController.kt
+++ b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaPlayController.kt
@@ -7,7 +7,7 @@ import com.frank.androidmedia.listener.PlayerCallback
 import java.io.IOException
 
 /**
- * The controller of MediaPlayer
+ * Using MediaPlayer to play a video or audio.
  *
  * @author frank
  * @date 2022/3/18