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.GLSurfaceViewandroid: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" /><Buttonandroid: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" /><Buttonandroid: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>() {@Overridepublic 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() {@Overridepublic void onOpened(@NonNull CameraDevice camera) {mCameraDevice = camera;}@Overridepublic void onDisconnected(@NonNull CameraDevice camera) {camera.close();mCameraDevice = null;}@Overridepublic 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() {@Overridepublic void onConfigured(@NonNull CameraCaptureSession session) {try {mCaptureRequest = mCaptureRequestBuilder.build();mCameraCaptureSession = session;mCameraCaptureSession.setRepeatingRequest(mCaptureRequest, null, mBackgroundHandler);} catch (CameraAccessException e) {e.printStackTrace();}}@Overridepublic 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");}}@Overridepublic 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;// EGLprivate 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;// Threadprivate 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();}}@Overridepublic 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 messageString seiMessage = "h264testdata" + message;seiBuffer.put((byte) seiMessage.length());// 设置 SEI user dataseiBuffer.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();}}@Overridepublic 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;}@Overridepublic 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();}}@Overridepublic 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() {@Overridepublic void onFrameAvailable(SurfaceTexture surfaceTexture) {mGlSurfaceView.requestRender();}});mSurface = new Surface(mSurfaceTexture);mCamera.startPreview(mSurface);}@Overridepublic 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;@Overrideprotected 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);}@Overrideprotected void onResume() {super.onResume();mRecordButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {synchronized (MainActivity.this) {startRecord();}}});mExitButton.setOnClickListener(new View.OnClickListener() {@Overridepublic 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@Overridepublic 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() {@Overridepublic void onClick(DialogInterface dialog, int which) {}}).setNegativeButton(android.R.string.cancel,new DialogInterface.OnClickListener() {@Overridepublic 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();}}