记录一下学习过程，得到一个需求是基于Camera2+OpenGL ES+MediaCodec+AudioRecord实现录制音视频。

需求：

1. 在每一帧视频数据中，写入SEI额外数据，方便后期解码时获得每一帧中的自定义数据。
2. 点击录制功能后，录制的是前N秒至后N秒这段时间的音视频，保存的文件都按照60s进行保存。

写在前面，整个学习过程涉及到以下内容，可以快速检索是否有想要的内容

• MediaCodec的使用，采用的是createInputSurface()创建一个surface，通过EGL接受camera2传过来的画面。
• AudioRecord的使用
• Camera2的使用
• OpenGL的简单使用
• H264 SEI的写入简单例子

整体思路设计比较简单，打开相机，创建OpenGL相关环境，然后创建video线程录制video相关数据，创建audio线程录制audio相关数据，video和audio数据都存在自定义的List中作为缓存，最后使用一个编码线程，将video List和audio List中的数据编码到MP4中即可。用的安卓sdk 28，因为29以上保存比较麻烦。整个工程暂时没上传，有需要私。
将以上功能都模块化，分别写到不同的类中。先介绍一些独立的模块。

UI布局

ui很简单，一个GLSurfaceView，两个button控件。

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <android.opengl.GLSurfaceView
        android:id="@+id/glView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <Button
        android:id="@+id/recordBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="80dp"
        android:text="Record"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />
    <Button
        android:id="@+id/exit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_marginRight="20dp"
        android:text="Eixt"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintRight_toRightOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Camera2

camera2框架的使用，比较简单，需要注意的一点是, startPreview函数中传入的surface用于后续mCaptureRequestBuilder.addTarget(surface)的参数传入。surface的产生由以下基本几步完成。现在简单提一下，下面会贴代码。
1.这个surface 就是通过openGL 生成的纹理， GLES30.glGenTextures(1, mTexture, 0);
2.纹理生成SurfaceTexture， mSurfaceTexture = new SurfaceTexture(mTexture[0]);
3.mSurfaceTexture生成一个surface, mSurface = new Surface(mSurfaceTexture);
4.mCamera.startPreview(mSurface);

public class Camera2 {
    private final String TAG = "Abbott Camera2";
    private Context mContext;
    private CameraManager mCameraManager;
    private CameraDevice mCameraDevice;
    private String[] mCamList;
    private String mCameraId;
    private Size mPreviewSize;
    private HandlerThread mBackgroundThread;
    private Handler mBackgroundHandler;
    private CaptureRequest.Builder mCaptureRequestBuilder;
    private CaptureRequest mCaptureRequest;
    private CameraCaptureSession mCameraCaptureSession;

    public Camera2(Context Context) {
        mContext = Context;
        mCameraManager = (CameraManager) mContext.getSystemService(android.content.Context.CAMERA_SERVICE);
        try {
            mCamList = mCameraManager.getCameraIdList();
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }

        mBackgroundThread = new HandlerThread("CameraThread");
        mBackgroundThread.start();
        mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
    }

    public void openCamera(int width, int height, String id) {
        try {
            Log.d(TAG, "openCamera: id:" + id);
            CameraCharacteristics characteristics = mCameraManager.getCameraCharacteristics(id);
            if (characteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT) {
            }
            StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
            mPreviewSize = getOptimalSize(map.getOutputSizes(SurfaceTexture.class), width, height);
            mCameraId = id;
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }

        try {
            if (ActivityCompat.checkSelfPermission(mContext, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            Log.d(TAG, "mCameraManager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);: " + mCameraId);
            mCameraManager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private Size getOptimalSize(Size[] sizeMap, int width, int height) {
        List<Size> sizeList = new ArrayList<>();
        for (Size option : sizeMap) {
            if (width > height) {
                if (option.getWidth() > width && option.getHeight() > height) {
                    sizeList.add(option);
                }
            } else {
                if (option.getWidth() > height && option.getHeight() > width) {
                    sizeList.add(option);
                }
            }
        }
        if (sizeList.size() > 0) {
            return Collections.min(sizeList, new Comparator<Size>() {
                @Override
                public int compare(Size lhs, Size rhs) {
                    return Long.signum((long) lhs.getWidth() * lhs.getHeight() - (long) rhs.getWidth() * rhs.getHeight());
                }
            });
        }
        return sizeMap[0];
    }

    private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
        @Override
        public void onOpened(@NonNull CameraDevice camera) {
            mCameraDevice = camera;
        }

        @Override
        public void onDisconnected(@NonNull CameraDevice camera) {
            camera.close();
            mCameraDevice = null;
        }

        @Override
        public void onError(@NonNull CameraDevice camera, int error) {
            camera.close();
            mCameraDevice = null;
        }
    };

    public void startPreview(Surface surface) {
        try {
            mCaptureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            mCaptureRequestBuilder.addTarget(surface);
            mCameraDevice.createCaptureSession(Collections.singletonList(surface), new CameraCaptureSession.StateCallback() {
                @Override
                public void onConfigured(@NonNull CameraCaptureSession session) {
                    try {
                        mCaptureRequest = mCaptureRequestBuilder.build();
                        mCameraCaptureSession = session;
                        mCameraCaptureSession.setRepeatingRequest(mCaptureRequest, null, mBackgroundHandler);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onConfigureFailed(@NonNull CameraCaptureSession session) {
                }
            }, mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
}

ImageList

这个类就是用于video 和audio缓存类，没有什么可以介绍的，直接用就好了。

public class ImageList {
    private static final String TAG = "Abbott ImageList";
    private Object mImageListLock = new Object();
    int kCapacity;
    private List<ImageItem> mImageList = new CopyOnWriteArrayList<>();

    public ImageList(int capacity) {
        kCapacity = capacity;
    }

    public synchronized void addItem(long Timestamp, ByteBuffer byteBuffer, MediaCodec.BufferInfo bufferInfo) {
        synchronized (mImageListLock) {
            ImageItem item = new ImageItem(Timestamp, byteBuffer, bufferInfo);
            mImageList.add(item);
            if (mImageList.size() > kCapacity) {
                int excessItems = mImageList.size() - kCapacity;
                mImageList.subList(0, excessItems).clear();
            }
        }
    }

    public synchronized List<ImageItem> getItemsInTimeRange(long startTimestamp, long endTimestamp) {
        List<ImageItem> itemsInTimeRange = new ArrayList<>();
        synchronized (mImageListLock) {
            for (ImageItem item : mImageList) {
                long itemTimestamp = item.getTimestamp();
                // 判断时间戳是否在指定范围内
                if (itemTimestamp >= startTimestamp && itemTimestamp <= endTimestamp) {
                    itemsInTimeRange.add(item);
                }
            }
        }
        return itemsInTimeRange;
    }

    public synchronized ImageItem getItem() {
        return mImageList.get(0);
    }

    public synchronized void removeItem() {
        mImageList.remove(0);
    }

    public synchronized int getSize() {
        return mImageList.size();
    }

    public static class ImageItem {
        private long mTimestamp;
        private ByteBuffer mVideoBuffer;
        private MediaCodec.BufferInfo mVideoBufferInfo;
        public ImageItem(long first, ByteBuffer second, MediaCodec.BufferInfo bufferInfo) {
            this.mTimestamp = first;
            this.mVideoBuffer = second;
            this.mVideoBufferInfo = bufferInfo;
        }

        public synchronized long getTimestamp() {
            return mTimestamp;
        }

        public synchronized ByteBuffer getVideoByteBuffer() {
            return mVideoBuffer;
        }

        public synchronized MediaCodec.BufferInfo getVideoBufferInfo() {
            return mVideoBufferInfo;
        }
    }
}

GlProgram

用于创建OpenGL的程序的类。目前使用的是OpenGL3.0 版本

public class GlProgram {
    public static final String mVertexShader =
            "#version 300 es \n" +
            "in vec4 vPosition;" +
            "in vec2 vCoordinate;" +
            "out vec2 vTextureCoordinate;" +
            "void main() {" +
            "   gl_Position = vPosition;" +
            "   vTextureCoordinate = vCoordinate;" +
            "}";
    public static final String mFragmentShader =
            "#version 300 es \n" +
            "#extension GL_OES_EGL_image_external : require \n" +
            "#extension GL_OES_EGL_image_external_essl3 : require \n" +
            "precision mediump float;" +
            "in vec2 vTextureCoordinate;" +
            "uniform samplerExternalOES oesTextureSampler;" +
            "out vec4 gl_FragColor;" +
            "void main() {" +
            "    gl_FragColor = texture(oesTextureSampler, vTextureCoordinate);" +
            "}";

    public static int createProgram(String vertexShaderSource, String fragShaderSource) {
        int program = GLES30.glCreateProgram();
        if (0 == program) {
            Log.e("Arc_ShaderManager", "create program error ,error=" + GLES30.glGetError());
            return 0;
        }
        int vertexShader = loadShader(GLES30.GL_VERTEX_SHADER, vertexShaderSource);
        if (0 == vertexShader) {
            return 0;
        }
        int fragShader = loadShader(GLES30.GL_FRAGMENT_SHADER, fragShaderSource);
        if (0 == fragShader) {
            return 0;
        }
        GLES30.glAttachShader(program, vertexShader);
        GLES30.glAttachShader(program, fragShader);
        GLES30.glLinkProgram(program);

        int[] status = new int[1];
        GLES30.glGetProgramiv(program, GLES30.GL_LINK_STATUS, status, 0);
        if (GLES30.GL_FALSE == status[0]) {
            String errorMsg = GLES30.glGetProgramInfoLog(program);
            Log.e("Arc_ShaderManager", "createProgram error : " + errorMsg);
            GLES30.glDeleteShader(vertexShader);
            GLES30.glDeleteShader(fragShader);
            GLES30.glDeleteProgram(program);
            return 0;
        }
        GLES30.glDetachShader(program, vertexShader);
        GLES30.glDetachShader(program, fragShader);
        GLES30.glDeleteShader(vertexShader);
        GLES30.glDeleteShader(fragShader);
        return program;
    }

    private static int loadShader(int type, String shaderSource) {
        int shader = GLES30.glCreateShader(type);
        if (0 == shader) {
            Log.e("Arc_ShaderManager", "create shader error, shader type=" + type + " , error=" + GLES30.glGetError());
            return 0;
        }
        GLES30.glShaderSource(shader, shaderSource);
        GLES30.glCompileShader(shader);

        int[] status = new int[1];
        GLES30.glGetShaderiv(shader, GLES30.GL_COMPILE_STATUS, status, 0);
        if (0 == status[0]) {
            String errorMsg = GLES30.glGetShaderInfoLog(shader);
            Log.e("Arc_ShaderManager", "createShader shader = " + type + "  error: " + errorMsg);
            GLES30.glDeleteShader(shader);
            return 0;
        }
        return shader;
    }
}

OesTexture

连接上面介绍的OpenGL程序，通过顶点着色器和片元着色器的坐标生成纹理

public class OesTexture {
    private static final String TAG = "Abbott OesTexture";
    private int mProgram;
    private final FloatBuffer mCordsBuffer;
    private final FloatBuffer mPositionBuffer;
    private int mPositionHandle;
    private int mCordsHandle;
    private int mOESTextureHandle;

    public OesTexture() {
        float[] positions = {
                -1.0f, 1.0f,
                -1.0f, -1.0f,
                1.0f, 1.0f,
                1.0f, -1.0f
        };
        float[] texCords = {
                0.0f, 0.0f,
                0.0f, 1.0f,
                1.0f, 0.0f,
                1.0f, 1.0f,
        };
        mPositionBuffer = ByteBuffer.allocateDirect(positions.length * 4).order(ByteOrder.nativeOrder())
                .asFloatBuffer();
        mPositionBuffer.put(positions).position(0);

        mCordsBuffer = ByteBuffer.allocateDirect(texCords.length * 4).order(ByteOrder.nativeOrder())
                .asFloatBuffer();
        mCordsBuffer.put(texCords).position(0);
    }

    public void init() {
        this.mProgram = GlProgram.createProgram(GlProgram.mVertexShader, GlProgram.mFragmentShader);
        if (0 == this.mProgram) {
            Log.e(TAG, "createProgram failed");
        }
        mPositionHandle = GLES30.glGetAttribLocation(mProgram, "vPosition");
        mCordsHandle = GLES30.glGetAttribLocation(mProgram, "vCoordinate");
        mOESTextureHandle = GLES30.glGetUniformLocation(mProgram, "oesTextureSampler");
        GLES30.glDisable(GLES30.GL_DEPTH_TEST);
    }

    public void PrepareTexture(int OESTextureId) {
        GLES30.glUseProgram(this.mProgram);
        GLES30.glEnableVertexAttribArray(mPositionHandle);
        GLES30.glVertexAttribPointer(mPositionHandle, 2, GLES30.GL_FLOAT, false, 2 * 4, mPositionBuffer);
        GLES30.glEnableVertexAttribArray(mCordsHandle);
        GLES30.glVertexAttribPointer(mCordsHandle, 2, GLES30.GL_FLOAT, false, 2 * 4, mCordsBuffer);
        GLES30.glActiveTexture(GLES30.GL_TEXTURE0);
        GLES30.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, OESTextureId);
        GLES30.glUniform1i(mOESTextureHandle, 0);
        GLES30.glDrawArrays(GLES30.GL_TRIANGLE_STRIP, 0, 4);
        GLES30.glDisableVertexAttribArray(mPositionHandle);
        GLES30.glDisableVertexAttribArray(mCordsHandle);
        GLES30.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, 0);
    }
}

接下来介绍的VideoRecorder，AudioEncoder，EncodingRunnable三个类需要互相搭配使用

public class AudioEncoder extends Thread {
    private static final String TAG = "Abbott AudioEncoder";
    private static final int SAVEMP4_INTERNAL = Param.recordInternal * 1000 * 1000;
    private static final int SAMPLE_RATE = 44100;
    private static final int CHANNEL_COUNT = 1;
    private static final int BIT_RATE = 96000;
    private EncodingRunnable mEncodingRunnable;
    private MediaCodec mMediaCodec;
    private AudioRecord mAudioRecord;
    private MediaFormat mFormat;
    private MediaFormat mOutputFormat;

    private long nanoTime;
    int mBufferSizeInBytes = 0;
    boolean mExitThread = true;
    private ImageList mAudioList;
    private MediaCodec.BufferInfo mAudioBufferInfo;
    private boolean mAlarm = false;
    private long mAlarmTime;
    private long mAlarmStartTime;
    private long mAlarmEndTime;
    private List<ImageList.ImageItem> mMuxerImageItem;
    private Object mLock = new Object();
    private MediaCodec.BufferInfo mAlarmBufferInfo;

    public AudioEncoder( EncodingRunnable encodingRunnable) throws IOException {
        mEncodingRunnable = encodingRunnable;
        nanoTime = System.nanoTime();
        createAudio();
        createMediaCodec();
        int kCapacity = 1000 / 20 * Param.recordInternal;
        mAudioList = new ImageList(kCapacity);
    }


    public void createAudio() {
        mBufferSizeInBytes = AudioRecord.getMinBufferSize(SAMPLE_RATE, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
        mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLE_RATE, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, mBufferSizeInBytes);
    }

    public void createMediaCodec() throws IOException {
        mFormat = MediaFormat.createAudioFormat(MediaFormat.MIMETYPE_AUDIO_AAC, SAMPLE_RATE, CHANNEL_COUNT);
        mFormat.setInteger(MediaFormat.KEY_AAC_PROFILE, MediaCodecInfo.CodecProfileLevel.AACObjectLC);
        mFormat.setInteger(MediaFormat.KEY_BIT_RATE, BIT_RATE);
        mFormat.setInteger(MediaFormat.KEY_MAX_INPUT_SIZE, 8192);
        mMediaCodec = MediaCodec.createEncoderByType(MediaFormat.MIMETYPE_AUDIO_AAC);
        mMediaCodec.configure(mFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
    }

    public synchronized void setAlarm() {
        synchronized (mLock) {
            Log.d(TAG, "setAudio Alarm enter");
            mEncodingRunnable.setAudioFormat(mOutputFormat);
            mEncodingRunnable.setAudioAlarmTrue();
            mAlarmTime = mAlarmBufferInfo.presentationTimeUs;
            mAlarmEndTime = mAlarmTime + SAVEMP4_INTERNAL;
            if (!mAlarm) {
                mAlarmStartTime = mAlarmTime - SAVEMP4_INTERNAL;
            }
            mAlarm = true;
            Log.d(TAG, "setAudio Alarm exit");
        }
    }


    @Override
    public void run() {
        super.run();
        mMediaCodec.start();
        mAudioRecord.startRecording();
        while (mExitThread) {
            synchronized (mLock) {
                byte[] inputAudioData = new byte[mBufferSizeInBytes];
                int res = mAudioRecord.read(inputAudioData, 0, inputAudioData.length);
                if (res > 0) {
                    if (mAudioRecord != null) {
                        enCodeAudio(inputAudioData);
                    }
                }
            }
        }
        Log.d(TAG, "AudioRecord run: exit");
    }

    private void enCodeAudio(byte[] inputAudioData) {
        mAudioBufferInfo = new MediaCodec.BufferInfo();
        int index = mMediaCodec.dequeueInputBuffer(-1);
        if (index < 0) {
            return;
        }
        ByteBuffer[] inputBuffers = mMediaCodec.getInputBuffers();
        ByteBuffer audioInputBuffer = inputBuffers[index];
        audioInputBuffer.clear();
        audioInputBuffer.put(inputAudioData);
        audioInputBuffer.limit(inputAudioData.length);
        mMediaCodec.queueInputBuffer(index, 0, inputAudioData.length, (System.nanoTime() - nanoTime) / 1000, 0);

        int status = mMediaCodec.dequeueOutputBuffer(mAudioBufferInfo, 0);
        ByteBuffer outputBuffer;
        if (status == MediaCodec.INFO_TRY_AGAIN_LATER) {
        } else if (status == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
            mOutputFormat = mMediaCodec.getOutputFormat();
        } else {
            while (status >= 0) {
                MediaCodec.BufferInfo tmpaudioBufferInfo = new MediaCodec.BufferInfo();
                tmpaudioBufferInfo.set(mAudioBufferInfo.offset, mAudioBufferInfo.size, mAudioBufferInfo.presentationTimeUs, mAudioBufferInfo.flags);
                mAlarmBufferInfo = new MediaCodec.BufferInfo();
                mAlarmBufferInfo.set(mAudioBufferInfo.offset, mAudioBufferInfo.size, mAudioBufferInfo.presentationTimeUs, mAudioBufferInfo.flags);
                outputBuffer = mMediaCodec.getOutputBuffer(status);
                ByteBuffer buffer = ByteBuffer.allocate(tmpaudioBufferInfo.size);
                buffer.limit(tmpaudioBufferInfo.size);
                buffer.put(outputBuffer);
                buffer.flip();
                if (tmpaudioBufferInfo.size > 0) {
                    if (mAlarm) {
                        mMuxerImageItem = mAudioList.getItemsInTimeRange(mAlarmStartTime, mAlarmEndTime);
                        for (ImageList.ImageItem item : mMuxerImageItem) {
                            mEncodingRunnable.pushAudio(item);
                        }
                        mAlarmStartTime = tmpaudioBufferInfo.presentationTimeUs;
                        mAudioList.addItem(tmpaudioBufferInfo.presentationTimeUs, buffer, tmpaudioBufferInfo);
                        if (tmpaudioBufferInfo.presentationTimeUs - mAlarmTime > SAVEMP4_INTERNAL) {
                            mAlarm = false;
                            mEncodingRunnable.setAudioAlarmFalse();
                            Log.d(TAG, "mEncodingRunnable.setAudio itemAlarmFalse();");
                        }
                    } else {
                        mAudioList.addItem(tmpaudioBufferInfo.presentationTimeUs, buffer, tmpaudioBufferInfo);
                    }
                }
                mMediaCodec.releaseOutputBuffer(status, false);
                status = mMediaCodec.dequeueOutputBuffer(mAudioBufferInfo, 0);
            }
        }
    }


    public synchronized void stopAudioRecord() throws IllegalStateException {
        synchronized (mLock) {
            mExitThread = false;
        }
        try {
            join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        mMediaCodec.stop();
        mMediaCodec.release();
        mMediaCodec = null;
    }
}

public class VideoRecorder extends Thread {
    private static final String TAG = "Abbott VideoRecorder";
    private static final int SAVE_MP4_Internal = 1000 * 1000 * Param.recordInternal;
    // EGL
    private static final int EGL_RECORDABLE_ANDROID = 0x3142;
    private EGLContext mEGLContext = EGL14.EGL_NO_CONTEXT;
    private EGLDisplay mEGLDisplay = EGL14.EGL_NO_DISPLAY;
    private EGLSurface mEGLSurface = EGL14.EGL_NO_SURFACE;
    private EGLContext mSharedContext = EGL14.EGL_NO_CONTEXT;
    private Surface mSurface;
    private int mOESTextureId;
    private OesTexture mOesTexture;
    private ImageList mImageList;
    private List<ImageList.ImageItem> muxerImageItem;
    // Thread
    private boolean mExitThread;
    private Object mLock = new Object();
    private Object object = new Object();
    private MediaCodec mMediaCodec;
    private MediaFormat mOutputFormat;
    private boolean mAlarm = false;
    private long mAlarmTime;
    private long mAlarmStartTime;
    private long mAlarmEndTime;

    private MediaCodec.BufferInfo mBufferInfo;
    private EncodingRunnable mEncodingRunnable;
    private String mSeiMessage;

    public VideoRecorder(EGLContext eglContext, EncodingRunnable encodingRunnable) {
        mSharedContext = eglContext;
        mEncodingRunnable = encodingRunnable;
        int kCapacity = 1000 / 40 * Param.recordInternal;
        mImageList = new ImageList(kCapacity);

        try {
            MediaFormat mediaFormat = MediaFormat.createVideoFormat(MediaFormat.MIMETYPE_VIDEO_AVC, 1920, 1080);
            mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
            mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, 1920 * 1080 * 25 / 5);
            mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, 25);
            mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 1);
            mMediaCodec = MediaCodec.createEncoderByType(MediaFormat.MIMETYPE_VIDEO_AVC);
            mMediaCodec.configure(mediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
            mSurface = mMediaCodec.createInputSurface();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    @Override
    public void run() {
        super.run();
        try {
            initEgl();
            mOesTexture = new OesTexture();
            mOesTexture.init();
            synchronized (mLock) {
                mLock.wait(33);
            }
            guardedRun();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void guardedRun() throws InterruptedException, RuntimeException {
        mExitThread = false;
        while (true) {
            synchronized (mLock) {
                if (mExitThread) {
                    break;
                }
                mLock.wait(33);
            }
            mOesTexture.PrepareTexture(mOESTextureId);
            swapBuffers();
            enCodeVideo();
        }
        Log.d(TAG, "guardedRun: exit");
        unInitEgl();
    }


    private void enCodeVideo() {
        mBufferInfo = new MediaCodec.BufferInfo();
        int status = mMediaCodec.dequeueOutputBuffer(mBufferInfo, 0);

        ByteBuffer outputBuffer = null;
        if (status == MediaCodec.INFO_TRY_AGAIN_LATER) {
        } else if (status == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
            mOutputFormat = mMediaCodec.getOutputFormat();
        } else if (status == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
        } else {
            outputBuffer = mMediaCodec.getOutputBuffer(status);
            if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) {
                mBufferInfo.size = 0;
            }
            if (mBufferInfo.size > 0) {
                outputBuffer.position(mBufferInfo.offset);
                outputBuffer.limit(mBufferInfo.size - mBufferInfo.offset);
                mSeiMessage = "avcIndex" + String.format("%05d", 0);
            }
            mMediaCodec.releaseOutputBuffer(status, false);
        }
        if (mBufferInfo.size > 0) {
            mEncodingRunnable.setTimeUs(mBufferInfo.presentationTimeUs);

            ByteBuffer seiData = buildSEIData(mSeiMessage);
            ByteBuffer frameWithSEI = ByteBuffer.allocate(outputBuffer.remaining() + seiData.remaining());
            frameWithSEI.put(seiData);
            frameWithSEI.put(outputBuffer);
            frameWithSEI.flip();
            mBufferInfo.size = frameWithSEI.remaining();

            MediaCodec.BufferInfo tmpAudioBufferInfo = new MediaCodec.BufferInfo();
            tmpAudioBufferInfo.set(mBufferInfo.offset, mBufferInfo.size, mBufferInfo.presentationTimeUs, mBufferInfo.flags);
            if (mAlarm) {
                muxerImageItem = mImageList.getItemsInTimeRange(mAlarmStartTime, mAlarmEndTime);
                mAlarmStartTime = tmpAudioBufferInfo.presentationTimeUs;
                for (ImageList.ImageItem item : muxerImageItem) {
                    mEncodingRunnable.push(item);
                }
                mImageList.addItem(tmpAudioBufferInfo.presentationTimeUs, frameWithSEI, tmpAudioBufferInfo);
                if (mBufferInfo.presentationTimeUs - mAlarmTime > SAVE_MP4_Internal) {
                    Log.d(TAG, "mEncodingRunnable.set itemAlarmFalse()");
                    Log.d(TAG, tmpAudioBufferInfo.presentationTimeUs + " " + mAlarmTime);
                    mAlarm = false;
                    mEncodingRunnable.setVideoAlarmFalse();
                }
            } else {
                mImageList.addItem(tmpAudioBufferInfo.presentationTimeUs, frameWithSEI, tmpAudioBufferInfo);
            }

        }
    }

    public synchronized void setAlarm() {
        synchronized (mLock) {
            Log.d(TAG, "setAlarm enter");
            mEncodingRunnable.setMediaFormat(mOutputFormat);
            mEncodingRunnable.setVideoAlarmTrue();
            if (mBufferInfo.presentationTimeUs != 0) {
                mAlarmTime = mBufferInfo.presentationTimeUs;
            }
            mAlarmEndTime = mAlarmTime + SAVE_MP4_Internal;
            if (!mAlarm) {
                mAlarmStartTime = mAlarmTime - SAVE_MP4_Internal;
            }
            mAlarm = true;
            Log.d(TAG, "setAlarm exit");
        }
    }

    public synchronized void startRecord() throws IllegalStateException {
        super.start();
        mMediaCodec.start();
    }

    public synchronized void stopVideoRecord() throws IllegalStateException {
        synchronized (mLock) {
            mExitThread = true;
            mLock.notify();
        }
        try {
            join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        mMediaCodec.signalEndOfInputStream();
        mMediaCodec.stop();
        mMediaCodec.release();
        mMediaCodec = null;
    }

    public void requestRender(int i) {
        synchronized (object) {
            mOESTextureId = i;
        }
    }

    private void initEgl() {
        this.mEGLDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
        if (this.mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
            throw new RuntimeException("EGL14.eglGetDisplay fail...");
        }
        int[] major_version = new int[2];
        boolean eglInited = EGL14.eglInitialize(this.mEGLDisplay, major_version, 0, major_version, 1);
        if (!eglInited) {
            this.mEGLDisplay = null;
            throw new RuntimeException("EGL14.eglInitialize fail...");
        }

        //4. 设置显示设备的属性
        int[] attrib_list = new int[]{
                EGL14.EGL_SURFACE_TYPE, EGL14.EGL_WINDOW_BIT,
                EGL14.EGL_RENDERABLE_TYPE, EGL14.EGL_OPENGL_ES2_BIT,
                EGL14.EGL_RED_SIZE, 8,
                EGL14.EGL_GREEN_SIZE, 8,
                EGL14.EGL_BLUE_SIZE, 8,
                EGL14.EGL_ALPHA_SIZE, 8,
                EGL14.EGL_DEPTH_SIZE, 16,
                EGL_RECORDABLE_ANDROID, 1,
                EGL14.EGL_NONE};

        EGLConfig[] configs = new EGLConfig[1];
        int[] numConfigs = new int[1];
        boolean eglChose = EGL14.eglChooseConfig(this.mEGLDisplay, attrib_list, 0, configs, 0, configs.length, numConfigs, 0);
        if (!eglChose) {
            throw new RuntimeException("eglChooseConfig [RGBA888 + recordable] ES2 EGL_config_fail...");
        }
        int[] attr_list = {EGL14.EGL_CONTEXT_CLIENT_VERSION, 2, EGL14.EGL_NONE};
        this.mEGLContext = EGL14.eglCreateContext(this.mEGLDisplay, configs[0], this.mSharedContext, attr_list, 0);

        checkEglError("eglCreateContext");
        if (this.mEGLContext == EGL14.EGL_NO_CONTEXT) {
            throw new RuntimeException("eglCreateContext == EGL_NO_CONTEXT");
        }
        int[] surface_attr = {EGL14.EGL_NONE};
        this.mEGLSurface = EGL14.eglCreateWindowSurface(this.mEGLDisplay, configs[0], this.mSurface, surface_attr, 0);
        if (this.mEGLSurface == EGL14.EGL_NO_SURFACE) {
            throw new RuntimeException("eglCreateWindowSurface == EGL_NO_SURFACE");
        }

        Log.d(TAG, "initEgl , display=" + this.mEGLDisplay + " ,context=" + this.mEGLContext + " ,sharedContext= " +
                this.mSharedContext + ", surface=" + this.mEGLSurface);
        boolean success = EGL14.eglMakeCurrent(this.mEGLDisplay, this.mEGLSurface, this.mEGLSurface, this.mEGLContext);
        if (!success) {
            checkEglError("makeCurrent");
            throw new RuntimeException("eglMakeCurrent failed");
        }
    }

    private void unInitEgl() {
        boolean success = EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT);
        if (!success) {
            checkEglError("makeCurrent");
            throw new RuntimeException("eglMakeCurrent failed");
        }
        if (this.mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
            EGL14.eglDestroySurface(this.mEGLDisplay, this.mEGLSurface);
            EGL14.eglDestroyContext(this.mEGLDisplay, this.mEGLContext);
            EGL14.eglTerminate(this.mEGLDisplay);
        }
        this.mEGLDisplay = EGL14.EGL_NO_DISPLAY;
        this.mEGLContext = EGL14.EGL_NO_CONTEXT;
        this.mEGLSurface = EGL14.EGL_NO_SURFACE;
        this.mSharedContext = EGL14.EGL_NO_CONTEXT;
        this.mSurface = null;
    }

    private boolean swapBuffers() {
        if ((null == this.mEGLDisplay) || (null == this.mEGLSurface)) {
            return false;
        }
        boolean success = EGL14.eglSwapBuffers(this.mEGLDisplay, this.mEGLSurface);
        if (!success) {
            checkEglError("eglSwapBuffers");
        }
        return success;
    }

    private void checkEglError(String msg) {
        int error = EGL14.eglGetError();
        if (error != EGL14.EGL_SUCCESS) {
            throw new RuntimeException(msg + ": EGL_ERROR_CODE: 0x" + Integer.toHexString(error));
        }
    }

    private ByteBuffer buildSEIData(String message) {
        // 构建 SEI 数据
        int seiSize = 128;
        ByteBuffer seiBuffer = ByteBuffer.allocate(seiSize);
        seiBuffer.put(new byte[]{0, 0, 0, 1, 6, 5});
        // 设置 SEI message
        String seiMessage = "h264testdata" + message;
        seiBuffer.put((byte) seiMessage.length());
        // 设置 SEI user data
        seiBuffer.put(seiMessage.getBytes());
        seiBuffer.flip();
        return seiBuffer;
    }

}

public class EncodingRunnable extends Thread {
    private static final String TAG = "Abbott EncodingRunnable";
    private Object mRecordLock = new Object();
    private boolean mExitThread = false;
    private MediaMuxer mMediaMuxer;
    private int avcIndex;
    private int mAudioIndex;
    private MediaFormat mOutputFormat;
    private MediaFormat mAudioOutputFormat;
    private ImageList mImageList;
    private ImageList mAudioImageList;
    private boolean itemAlarm;
    private long mAudioImageListTimeUs = -1;
    private boolean mAudioAlarm;

    private int mVideoCapcity = 1000 / 40 * Param.recordInternal;
    private int mAudioCapcity = 1000 / 20 * Param.recordInternal;
    private int recordSecond = 1000 * 1000 * 60;
    long Video60sStart = -1;

    public EncodingRunnable() {
        mImageList = new ImageList(mVideoCapcity);
        mAudioImageList = new ImageList(mAudioCapcity);
    }

    private boolean mIsRecoding = false;

    public void setMediaFormat(MediaFormat OutputFormat) {
        if (mOutputFormat == null) {
            mOutputFormat = OutputFormat;
        }
    }

    public void setAudioFormat(MediaFormat OutputFormat) {
        if (mAudioOutputFormat == null) {
            mAudioOutputFormat = OutputFormat;
        }
    }

    public void setMediaMuxerConfig() {
        long currentTimeMillis = System.currentTimeMillis();
        Date currentDate = new Date(currentTimeMillis);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault());
        String fileName = dateFormat.format(currentDate);
        File mFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM),
                fileName + ".MP4");
        Log.d(TAG, "setMediaMuxerSavaPath: new MediaMuxer  " + mFile.getPath());
        try {
            mMediaMuxer = new MediaMuxer(mFile.getPath(), MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
        } catch (IOException e) {
            e.printStackTrace();
        }
        avcIndex = mMediaMuxer.addTrack(mOutputFormat);
        mAudioIndex = mMediaMuxer.addTrack(mAudioOutputFormat);
        mMediaMuxer.start();

    }

    public void setMediaMuxerSavaPath() {
        if (!mIsRecoding) {
            mExitThread = false;
            setMediaMuxerConfig();
            setRecording();
            notifyStartRecord();
        }
    }

    @Override
    public void run() {
        super.run();
        while (true) {
            synchronized (mRecordLock) {
                try {
                    mRecordLock.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            MediaCodec.BufferInfo tmpAudioBufferInfo = new MediaCodec.BufferInfo();
            while (mIsRecoding) {
                if (mAudioImageList.getSize() > 0) {
                    ImageList.ImageItem audioItem = mAudioImageList.getItem();
                    tmpAudioBufferInfo.set(audioItem.getVideoBufferInfo().offset,
                            audioItem.getVideoBufferInfo().size,
                            audioItem.getVideoBufferInfo().presentationTimeUs + mAudioImageListTimeUs,
                            audioItem.getVideoBufferInfo().flags);
                    mMediaMuxer.writeSampleData(mAudioIndex, audioItem.getVideoByteBuffer(), tmpAudioBufferInfo);
                    mAudioImageList.removeItem();
                }
                if (mImageList.getSize() > 0) {
                    ImageList.ImageItem item = mImageList.getItem();
                    if (Video60sStart < 0) {
                        Video60sStart = item.getVideoBufferInfo().presentationTimeUs;
                    }
                    mMediaMuxer.writeSampleData(avcIndex, item.getVideoByteBuffer(), item.getVideoBufferInfo());
                    if (item.getVideoBufferInfo().presentationTimeUs - Video60sStart > recordSecond) {
                        Log.d(TAG, "System.currentTimeMillis() - Video60sStart :" + (item.getVideoBufferInfo().presentationTimeUs - Video60sStart));
                        mMediaMuxer.stop();
                        mMediaMuxer.release();
                        mMediaMuxer = null;
                        setMediaMuxerConfig();
                        Video60sStart = -1;
                    }
                    mImageList.removeItem();
                }
                if (itemAlarm == false && mAudioAlarm == false) {
                    mIsRecoding = false;
                    Log.d(TAG, "mediaMuxer.stop()");
                    mMediaMuxer.stop();
                    mMediaMuxer.release();
                    mMediaMuxer = null;
                    break;
                }
            }
            if (mExitThread) {
                break;
            }
        }
    }

    public synchronized void setRecording() throws IllegalStateException {
        synchronized (mRecordLock) {
            mIsRecoding = true;
        }
    }

    public synchronized void setAudioAlarmTrue() throws IllegalStateException {
        synchronized (mRecordLock) {
            mAudioAlarm = true;
        }
    }

    public synchronized void setVideoAlarmTrue() throws IllegalStateException {
        synchronized (mRecordLock) {
            itemAlarm = true;
        }
    }

    public synchronized void setAudioAlarmFalse() throws IllegalStateException {
        synchronized (mRecordLock) {
            mAudioAlarm = false;
        }
    }

    public synchronized void setVideoAlarmFalse() throws IllegalStateException {
        synchronized (mRecordLock) {
            itemAlarm = false;
        }
    }


    public synchronized void notifyStartRecord() throws IllegalStateException {
        synchronized (mRecordLock) {
            mRecordLock.notify();
        }
    }

    public synchronized void push(ImageList.ImageItem item) {
        mImageList.addItem(item.getTimestamp(),
                item.getVideoByteBuffer(),
                item.getVideoBufferInfo());
    }

    public synchronized void pushAudio(ImageList.ImageItem item) {
        synchronized (mRecordLock) {
            mAudioImageList.addItem(item.getTimestamp(),
                    item.getVideoByteBuffer(),
                    item.getVideoBufferInfo());
        }
    }

    public synchronized void setTimeUs(long l) {
        if (mAudioImageListTimeUs != -1) {
            return;
        }
        mAudioImageListTimeUs = l;
        Log.d(TAG, "setTimeUs: " + l);
    }

    public synchronized void setExitThread() {
        mExitThread = true;
        mIsRecoding = false;
        notifyStartRecord();
        try {
            join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

}

最后介绍一下Camera2Renderer和MainActivity

Camera2Renderer

Camera2Renderer继承GLSurfaceView.Renderer，通过这个类来调动所有的代码。

public class Camera2Renderer implements GLSurfaceView.Renderer {
    private static final String TAG = "Abbott Camera2Renderer";
    final private Context mContext;
    final private GLSurfaceView mGlSurfaceView;
    private Camera2 mCamera;
    private int[] mTexture = new int[1];
    private SurfaceTexture mSurfaceTexture;
    private Surface mSurface;
    private OesTexture mOesTexture;
    private EGLContext mEglContext = null;
    private VideoRecorder mVideoRecorder;
    private EncodingRunnable mEncodingRunnable;
    private AudioEncoder mAudioEncoder;

    public Camera2Renderer(Context context, GLSurfaceView glSurfaceView, EncodingRunnable encodingRunnable) {
        mContext = context;
        mGlSurfaceView = glSurfaceView;
        mEncodingRunnable = encodingRunnable;
    }


    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        mCamera = new Camera2(mContext);
        mCamera.openCamera(1920, 1080, "0");
        mOesTexture = new OesTexture();
        mOesTexture.init();
        mEglContext = EGL14.eglGetCurrentContext();
        mVideoRecorder = new VideoRecorder(mEglContext, mEncodingRunnable);
        mVideoRecorder.startRecord();
        try {
            mAudioEncoder = new AudioEncoder(mEncodingRunnable);
            mAudioEncoder.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height) {
        GLES30.glGenTextures(1, mTexture, 0);
        GLES30.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTexture[0]);
        GLES30.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
        GLES30.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
        GLES30.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE);
        GLES30.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE);
        GLES30.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, 0);
        mSurfaceTexture = new SurfaceTexture(mTexture[0]);
        mSurfaceTexture.setDefaultBufferSize(1920, 1080);
        mSurfaceTexture.setOnFrameAvailableListener(new SurfaceTexture.OnFrameAvailableListener() {
            @Override
            public void onFrameAvailable(SurfaceTexture surfaceTexture) {
                mGlSurfaceView.requestRender();
            }
        });
        mSurface = new Surface(mSurfaceTexture);
        mCamera.startPreview(mSurface);
    }

    @Override
    public void onDrawFrame(GL10 gl) {
        mSurfaceTexture.updateTexImage();
        mOesTexture.PrepareTexture(mTexture[0]);
        mVideoRecorder.requestRender(mTexture[0]);
    }

    public VideoRecorder getVideoRecorder() {
        return mVideoRecorder;
    }

    public AudioEncoder getAudioEncoder() {
        return mAudioEncoder;
    }
}

主函数比较简单，就是申请权限而已。

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "Abbott MainActivity";
    private static final String FRAGMENT_DIALOG = "dialog";
    private final Object mLock = new Object();

    private GLSurfaceView mGlSurfaceView;
    private Button mRecordButton;
    private Button mExitButton;

    private Camera2Renderer mCamera2Renderer;
    private VideoRecorder mVideoRecorder;
    private EncodingRunnable mEncodingRunnable;
    private AudioEncoder mAudioEncoder;
    private static final int REQUEST_CAMERA_PERMISSION = 1;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
                || ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
                || ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
                || ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
            requestCameraPermission();
            return;
        }

        setContentView(R.layout.activity_main);
        mGlSurfaceView = findViewById(R.id.glView);
        mRecordButton = findViewById(R.id.recordBtn);
        mExitButton = findViewById(R.id.exit);

        mGlSurfaceView.setEGLContextClientVersion(3);
        mEncodingRunnable = new EncodingRunnable();
        mEncodingRunnable.start();
        mCamera2Renderer = new Camera2Renderer(this, mGlSurfaceView, mEncodingRunnable);
        mGlSurfaceView.setRenderer(mCamera2Renderer);
        mGlSurfaceView.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);

    }

    @Override
    protected void onResume() {
        super.onResume();
        mRecordButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                synchronized (MainActivity.this) {
                    startRecord();
                }
            }
        });

        mExitButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                stopRecord();
                Log.d(TAG, "onClick: exit program");
                finish();
            }
        });

    }

    private void requestCameraPermission() {
        if (shouldShowRequestPermissionRationale(Manifest.permission.CAMERA) ||
                shouldShowRequestPermissionRationale(Manifest.permission.WRITE_EXTERNAL_STORAGE) ||
                shouldShowRequestPermissionRationale(Manifest.permission.RECORD_AUDIO)) {
            new ConfirmationDialog().show(getSupportFragmentManager(), FRAGMENT_DIALOG);
        } else {
            requestPermissions(new String[]{Manifest.permission.CAMERA,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    Manifest.permission.RECORD_AUDIO}, REQUEST_CAMERA_PERMISSION);
        }
    }

    public static class ConfirmationDialog extends DialogFragment {
        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            final Fragment parent = getParentFragment();
            return new AlertDialog.Builder(getActivity())
                    .setMessage(R.string.request_permission)
                    .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                        }
                    })
                    .setNegativeButton(android.R.string.cancel,
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    Activity activity = parent.getActivity();
                                    if (activity != null) {
                                        activity.finish();
                                    }
                                }
                            })
                    .create();
        }
    }


    private void startRecord() {
        synchronized (mLock) {
            try {
                if (mVideoRecorder == null) {
                    mVideoRecorder = mCamera2Renderer.getVideoRecorder();
                }
                if (mAudioEncoder == null) {
                    mAudioEncoder = mCamera2Renderer.getAudioEncoder();
                }
                mVideoRecorder.setAlarm();
                mAudioEncoder.setAlarm();
                mEncodingRunnable.setMediaMuxerSavaPath();
                Log.d(TAG, "Start Record ");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    private void stopRecord() {
        if (mVideoRecorder == null) {
            mVideoRecorder = mCamera2Renderer.getVideoRecorder();
        }
        if (mAudioEncoder == null) {
            mAudioEncoder = mCamera2Renderer.getAudioEncoder();
        }
        mEncodingRunnable.setExitThread();
        mVideoRecorder.stopVideoRecord();
        mAudioEncoder.stopAudioRecord();
    }


}