diff --git a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioTrackController.kt b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioTrackController.kt
new file mode 100644
index 0000000..616122b
--- /dev/null
+++ b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/AudioTrackController.kt
@@ -0,0 +1,146 @@
+package com.frank.androidmedia.controller
+
+import android.media.*
+import android.os.SystemClock
+import android.util.Log
+import java.lang.Exception
+
+/**
+ * 1. Using MediaExtractor to demux audio.
+ * 2. Using MediaCodec to decode audio.
+ * 3. Using AudioTrack to play audio.
+ * See also AAduio, oboe, openSL ES.
+ *
+ * @author frank
+ * @date 2022/3/21
+ */
+open class AudioTrackController {
+
+    companion object {
+        val TAG: String = AudioTrackController::class.java.simpleName
+
+        private const val DEQUEUE_TIME = (10 * 1000).toLong()
+        private const val SLEEP_TIME: Long = 20
+    }
+
+    private var audioTrack: AudioTrack? = null
+    private var mediaCodec: MediaCodec? = null
+    private var mediaExtractor: MediaExtractor? = null
+
+    private fun parseAudioFormat(path: String): MediaFormat? {
+        mediaExtractor = MediaExtractor()
+        try {
+            mediaExtractor?.setDataSource(path)
+            for (i in 0 until mediaExtractor!!.trackCount) {
+                val mediaFormat = mediaExtractor!!.getTrackFormat(i)
+                val mimeType = mediaFormat.getString(MediaFormat.KEY_MIME)
+                if (mimeType != null && mimeType.startsWith("audio")) {
+                    mediaExtractor!!.selectTrack(i)
+                    return mediaFormat
+                }
+            }
+        } catch (e: Exception) {
+            Log.e(TAG, "parseAudioFormat err=$e")
+        }
+        return null
+    }
+
+    private fun initMediaCodec(mediaFormat: MediaFormat): Boolean {
+        val mimeType = mediaFormat.getString(MediaFormat.KEY_MIME)
+        mediaCodec = MediaCodec.createDecoderByType(mimeType)
+        return try {
+            mediaCodec!!.configure(mediaFormat, null, null, 0)
+            mediaCodec!!.start()
+            true
+        } catch (e: Exception) {
+            Log.e(TAG, "initMediaCodec err=$e")
+            false
+        }
+    }
+
+    private fun initAudioTrack(mediaFormat: MediaFormat): Boolean {
+        val sampleRate = mediaFormat.getInteger(MediaFormat.KEY_SAMPLE_RATE)
+        val channelCount = mediaFormat.getInteger(MediaFormat.KEY_CHANNEL_COUNT)
+        val channelConfig = if (channelCount == 1) {
+            AudioFormat.CHANNEL_OUT_MONO
+        } else  {
+            AudioFormat.CHANNEL_OUT_STEREO
+        }
+        val audioFormat = AudioFormat.ENCODING_PCM_16BIT
+        val bufferSize = AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat)
+        Log.e(TAG, "sampleRate=$sampleRate, channelCount=$channelCount, bufferSize=$bufferSize")
+
+        try {
+            audioTrack = AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, channelConfig, audioFormat, bufferSize, AudioTrack.MODE_STREAM)
+            audioTrack!!.play()
+//            audioTrack!!.attachAuxEffect()
+        } catch (e: Exception) {
+            Log.e(TAG, "initAudioTrack err=$e")
+            return false
+        }
+        return true
+    }
+
+    private fun release() {
+        if (mediaExtractor != null) {
+            mediaExtractor!!.release()
+            mediaExtractor = null
+        }
+        if (mediaCodec != null) {
+            mediaCodec!!.release()
+            mediaCodec = null
+        }
+        if (audioTrack != null) {
+            audioTrack!!.release()
+            audioTrack = null
+        }
+    }
+
+    fun playAudio(path: String) {
+        val data = ByteArray(10 * 1024)
+        var finished = false
+        val bufferInfo = MediaCodec.BufferInfo()
+        val mediaFormat = parseAudioFormat(path) ?: return release()
+        var result = initMediaCodec(mediaFormat)
+        if (!result) {
+            return release()
+        }
+        result = initAudioTrack(mediaFormat)
+        if (!result) {
+            return release()
+        }
+
+        while (!finished) {
+            val inputIndex = mediaCodec!!.dequeueInputBuffer(DEQUEUE_TIME)
+            if (inputIndex >= 0) {
+                val inputBuffer = mediaCodec!!.getInputBuffer(inputIndex)
+                // demux
+                val sampleSize = mediaExtractor!!.readSampleData(inputBuffer!!, 0)
+                Log.e(TAG, "sampleSize=$sampleSize")
+                // decode
+                if (sampleSize < 0) {
+                    mediaCodec!!.queueInputBuffer(inputIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM)
+                    finished = true
+                } else {
+                    mediaCodec!!.queueInputBuffer(inputIndex, 0, sampleSize, mediaExtractor!!.sampleTime, mediaExtractor!!.sampleFlags)
+                    mediaExtractor!!.advance()
+                }
+            }
+
+            val outputIndex = mediaCodec!!.dequeueOutputBuffer(bufferInfo, DEQUEUE_TIME)
+            // play
+            if (outputIndex >= 0) {
+                val outputBuffer = mediaCodec!!.getOutputBuffer(outputIndex)
+                val size = outputBuffer!!.limit()
+                Log.e(TAG, "outputIndex=$outputIndex, position=" + outputBuffer.position() + " ,limit=" + size)
+                outputBuffer.get(data, outputBuffer.position(), size)
+                audioTrack!!.write(data, 0, size)
+                mediaCodec!!.releaseOutputBuffer(outputIndex, false)
+                SystemClock.sleep(SLEEP_TIME)
+            }
+        }
+
+        release()
+    }
+
+}
\ No newline at end of file
diff --git a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaDecodeController.kt b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaDecodeController.kt
index ca94e59..4e1362a 100644
--- a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaDecodeController.kt
+++ b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaDecodeController.kt
@@ -209,7 +209,6 @@ open class MediaDecodeController(val mSurface: Surface, val mFilePath: String, v
                 mediaCodec!!.configure(mediaFormat, mSurface, null, 0)
                 mediaCodec!!.start()
                 val bufferInfo = MediaCodec.BufferInfo()
-                val inputBuffers = mediaCodec!!.inputBuffers
 
                 while (!isInterrupted) {
                     if (!isPreviewing) {
@@ -219,8 +218,8 @@ open class MediaDecodeController(val mSurface: Surface, val mFilePath: String, v
                     //dequeue from input buffer
                     val inputIndex = mediaCodec!!.dequeueInputBuffer(DEQUEUE_TIME)
                     if (inputIndex >= 0) {
-                        val inputBuffer = inputBuffers[inputIndex]
-                        val sampleSize = mediaExtractor!!.readSampleData(inputBuffer, 0)
+                        val inputBuffer = mediaCodec!!.getInputBuffer(inputIndex)
+                        val sampleSize = mediaExtractor!!.readSampleData(inputBuffer!!, 0)
                         //enqueue to input buffer
                         if (sampleSize < 0) {
                             mediaCodec!!.queueInputBuffer(inputIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM)
diff --git a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaMuxController.kt b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaMuxController.kt
index 5f879b5..840399d 100644
--- a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaMuxController.kt
+++ b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaMuxController.kt
@@ -57,7 +57,6 @@ open class MediaMuxController {
 
             while (!finished) {
                 val sampleSize = mediaExtractor.readSampleData(inputBuffer, 0)
-                Log.i("MediaMuxerController", "sampleIndex=" + mediaExtractor.sampleTrackIndex + ",sampleSize=" + sampleSize)
                 if (sampleSize > 0) {
                     bufferInfo.size = sampleSize
                     bufferInfo.flags = mediaExtractor.sampleFlags
@@ -75,14 +74,14 @@ open class MediaMuxController {
             }
 
         } catch (e: Exception) {
-            Log.e("MediaMuxerController", "mux error=$e")
+            Log.e("MediaMuxController", "mux error=$e")
             happenError = true
         } finally {
             try {
                 mediaMuxer.release()
                 mediaExtractor.release()
             } catch (e1: Exception) {
-                Log.e("MediaMuxerController", "release error=$e1")
+                Log.e("MediaMuxController", "release error=$e1")
             }
             return !happenError
         }