android 使用AudioRecord + MediaCodec+屏幕录制+mp4v2 录制mp4 ，没有声音？求大神解答一下!

[while(1){}]

/**
     * 初始化 
     */
    private Params initAudioDevice() {
        int[] sampleRates = {44100, 22050, 16000, 11025};
        for (int sampleRate :
                sampleRates) {
            //编码制式
            int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
            // stereo 立体声，
            int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_STEREO;
            int buffsize = 2 * AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);
            mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, channelConfig,
                    audioFormat, buffsize);
            if (mAudioRecord.getState() != AudioRecord.STATE_INITIALIZED) {
                continue;
            }
            this.buffer = new byte[Math.min(4096, buffsize)];

            return new Params(sampleRate,
                    channelConfig == AudioFormat.CHANNEL_CONFIGURATION_STEREO ? 2 : 1);
        }

        return null;
    }
   /**
     * 开始录音
     */
    public void start() {
        workThread = new Thread() {
            @Override
            public void run() {
                mAudioRecord.startRecording();
                while (loop && !Thread.interrupted()) {
                    int size = mAudioRecord.read(buffer, 0, buffer.length);
                    if (size < 0) {
                        LogUtil.i("audio ignore ,no data to read");
                        break;
                    }
                    if (loop) {
                        byte[] audio = new byte[size];
                        System.arraycopy(buffer, 0, audio, 0, size);
                        if (mCallback != null) {
                            mCallback.audioData(audio);
                        }
                    }
                }

            }
        };

        loop = true;
        workThread.start();
    }

MedaiCodec 编码器部分

 MediaCodec aencoder = MediaCodec.createEncoderByType(MediaFormat.MIMETYPE_AUDIO_AAC);
            MediaFormat format = MediaFormat.createAudioFormat(MediaFormat.MIMETYPE_AUDIO_AAC,
                    sampleRate, chanelCount);
            format.setInteger(KEY_MAX_INPUT_SIZE, 0);
            format.setInteger(KEY_BIT_RATE, sampleRate * chanelCount);
            aencoder.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);

 /**
     * 音频编码
     *
     * @param data
     */
    private void encodeAudioData(byte[] data) {
        ByteBuffer[] inputBuffers = aEncoder.getInputBuffers();
        ByteBuffer[] outputBuffers = aEncoder.getOutputBuffers();
        int inputBufferId = aEncoder.dequeueInputBuffer(-1);
        if (inputBufferId >= 0) {
            ByteBuffer bb = inputBuffers[inputBufferId];
            bb.clear();
            bb.put(data, 0, data.length);
            long pts = new Date().getTime() * 1000 - presentationTimeUs;
            aEncoder.queueInputBuffer(inputBufferId, 0, data.length, pts, 0);
        }

        int outputBufferIndex = aEncoder.dequeueOutputBuffer(aBufferInfo, -1);
        while (outputBufferIndex >= 0) {  //编码器有可能一次性突出多条数据 所以使用while
            // outputBuffers[outputBufferId] is ready to be processed or rendered.
            ByteBuffer bb = outputBuffers[outputBufferIndex];

            LogUtil.i(aBufferInfo.size + " -- aac -- byte *********");
            parserAudioEncodeData(bb, aBufferInfo);
            aEncoder.releaseOutputBuffer(outputBufferIndex, false);
            outputBufferIndex = aEncoder.dequeueOutputBuffer(aBufferInfo, 0);
        }

    }

使用 MP4v2库合成 MP4

   recordCtx->m_aTrackId = MP4AddAudioTrack(recordCtx->m_mp4FHandle, 8000, 160, MP4_MPEG4_AUDIO_TYPE);
    if (recordCtx->m_aTrackId == MP4_INVALID_TRACK_ID){
        printf("error : MP4AddAudioTrack  \n");
        return NULL;
    }

    MP4SetAudioProfileLevel(recordCtx->m_mp4FHandle, 0x02);// 2, 1//    uint8_t aacConfig[2] = {18,16};
    //uint8_t aacConfig[2] = {0x14, 0x10};
    uint8_t aacConfig[2] = {0x15,0x88};
    MP4SetTrackESConfiguration(recordCtx->m_mp4FHandle,recordCtx->m_aTrackId,aacConfig,2);
  
int mp4AEncode(MP4V2_CONTEXT * recordCtx, uint8_t * data ,int len){
    if(recordCtx->m_vTrackId == MP4_INVALID_TRACK_ID){
        LOGI("aac写入失败!");
        return -1;
    }
    LOGI("aac写入成功!");
    MP4WriteSample(recordCtx->m_mp4FHandle, recordCtx->m_aTrackId, data, len , MP4_INVALID_DURATION, 0, 1);
    recordCtx->m_vFrameDur += 160;
    return 0;
}

录制的MP4文件没有声音 求大神解答一下，谢谢! (视频没有问题 没有贴出代码!)