android开发，通过摄像头实时采集视频并使用MediaCodec硬编码为H264

心已赠人 2022-06-15 07:46 242阅读 0赞

最近研究视频通话，写一下关于摄像头采集视频并使用MediaCodec硬编码为H264的过程，希望对有需要的朋友有所帮助。

说实话，刚开始不太熟折腾了挺久的，网上这方面的东西比较少，很多都是代码片段或者就是其他语言写的。这里贴的是本人亲测能用的，希望需要的朋友能少走一些弯路吧。

直接来看看代码吧。都有详细的注释的。

package com.kokjuis.travel.activity;
    
    import android.app.Activity;
    import android.graphics.ImageFormat;
    import android.hardware.Camera;
    import android.media.AudioFormat;
    import android.media.AudioRecord;
    import android.media.MediaCodec;
    import android.media.MediaRecorder;
    import android.os.AsyncTask;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.util.Log;
    import android.view.SurfaceView;
    import android.view.View;
    import android.view.Window;
    import android.view.WindowManager;
    import android.widget.ImageButton;
    import android.widget.ImageView;
    
    import com.imsdk.general.ImApplication;
    import com.imsdk.handler.UdpMessageHandler;
    import com.imsdk.listener.MediaListener;
    import com.imsdk.socket.udp.codec.RtspPacketDecode;
    import com.imsdk.socket.udp.codec.RtspPacketEncode;
    import com.imsdk.utils.AacEncode;
    import com.imsdk.utils.AvcDecode;
    import com.imsdk.utils.AvcEncoder;
    import com.kokjuis.travel.R;
    import com.kokjuis.travel.customView.RoundImageView;
    import com.kokjuis.travel.entity.User;
    import com.kokjuis.travel.utils.T;
    
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.InetAddress;
    import java.net.SocketException;
    import java.net.UnknownHostException;
    import java.nio.ByteBuffer;
    import java.util.ArrayList;
    import java.util.List;
    
    
    /**
     * Created by LONG on 2017/3/31.
     */
    
    public class VideoChatActivity extends Activity implements View.OnClickListener, Camera.PreviewCallback, MediaListener, RtspPacketEncode.H264ToRtpLinsener {
    
        private static final String TAG = "VideoChatActivity";
    
    	//这里是为了发送视频到vlc客户端进行测试。
        private InetAddress address;
        private DatagramSocket socket;
        private UdpSendTask netSendTask;
        //-----------------------------------------------------------
    
    
        //开始录制按钮
        ImageButton record;
    	//切换前后摄像头按钮
        ImageView change;
    
        // 显示视频预览的SurfaceView
        SurfaceView sView, mView;
        // 记录是否正在进行录制
        private boolean isRecording = false;
        private Camera mCamera;
        private int cameraPosition = 1;//1代表前置摄像头，0代表后置摄像头
        private int displayOrientation = 90;//相机预览方向，默认是横屏的，旋转90度为竖屏
        //视频采集分辨率
        int width = 320;
        int height = 240;
        byte[] h264;//接收H264
        //h264硬编码器
        AvcEncoder avcEncoder;
        //h264硬解码器
        AvcDecode avcDecode;
    
    
    
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            // 去掉标题栏 ,必须放在setContentView之前
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.activity_video_chat);
            // 设置横屏显示
            // setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            // 设置全屏
            getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);
            // 选择支持半透明模式,在有surfaceview的activity中使用。
            //getWindow().setFormat(PixelFormat.TRANSLUCENT);
            // 获取程序界面中的按钮
            record = (ImageButton) findViewById(R.id.record);
            change = (ImageView) findViewById(R.id.change);
           
    
            // 未开始录制时让切换相机按钮不可用。
            change.setEnabled(false);
    		//把按钮设为灰色
            change.setBackground(getResources().getDrawable(R.drawable.agx));
            // 为两个按钮的单击事件绑定监听器
            record.setOnClickListener(this);
            change.setOnClickListener(this);
    
            // 获取程序界面中的大预览SurfaceView
            sView = (SurfaceView) this.findViewById(R.id.sView);
            // 设置分辨率
            sView.getHolder().setFixedSize(width, height);
            // 设置该组件让屏幕不会自动关闭
            sView.getHolder().setKeepScreenOn(true);
    		
            // 获取程序界面中的小的预览SurfaceView
            mView = (SurfaceView) this.findViewById(R.id.mView);
            // 设置分辨率
            mView.getHolder().setFixedSize(width, height);
    
    
    
    		//-------------启动发送数据线程-----------------
            netSendTask = new UdpSendTask();
            netSendTask.init();
            netSendTask.start();
    
        }
    
        @Override
        public void onClick(View source) {
            switch (source.getId()) {
                // 单击录制按钮
                case R.id.record:
                   initCameara();
                    break;
                case R.id.change:
                    //切换摄像头
                    change();
                    break;
            }
        }
    
        //初始化相机
        private void initCameara() {
            try {
                mCamera = Camera.open(cameraPosition);
                mCamera.setPreviewDisplay(mView.getHolder());
                //设置预览方向
                mCamera.setDisplayOrientation(displayOrientation);
    
    
                //获取相机配置参数
                Camera.Parameters parameters = mCamera.getParameters();
    			
    			//这里只是打印摄像头支持的分辨率，实际对程序没有作用，可以删除
                List<Camera.Size> supportedPreviewSizes = parameters
                        .getSupportedPreviewSizes();
                for (Camera.Size s : supportedPreviewSizes
                        ) {
                    Log.v(TAG, s.width + "----" + s.height);
                }
    
                parameters.setFlashMode("off"); // 无闪光灯
                parameters.setPreviewFormat(ImageFormat.NV21); //设置采集视频的格式，默认为NV21,注意，相机预览只支持NV21和YV12两种格式，其他格式会花屏
                parameters.setPreviewFrameRate(10);//设置帧率
                parameters.setPreviewSize(width, height);//设置分辨率
                parameters.setPictureSize(width, height);
    
                mCamera.setParameters(parameters); // 将Camera.Parameters设定予Camera
    
                //设置预览回调
                mCamera.setPreviewCallback((Camera.PreviewCallback) this);
                mCamera.startPreview();
    
                //开始采集让摄像头切换按钮可用
                change.setEnabled(true);
    			//变成红色
                change.setBackground(getResources().getDrawable(R.drawable.ahv));
    
                //初始化视频编解码器
                avcEncoder = new AvcEncoder(width, height, 10, 125000);
                avcDecode = new AvcDecode(width, height, sView.getHolder().getSurface());
        
    
            } catch (Exception e) {
                Log.i("jw", "camera error:" + Log.getStackTraceString(e));
            }
    
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            destroyCamera();
            isRecording = false;
        }
    
        private void destroyCamera() {
            if (mCamera == null) {
                return;
            }
            //！！这个必须在前，不然退出出错
            mCamera.setPreviewCallback(null);
            mCamera.stopPreview();
            mCamera.release();
            mCamera = null;
        }
    
        @Override
        public void onPreviewFrame(byte[] bytes, Camera camera) {
            try {
                if (isRecording) {
                    //摄像头数据转h264
                    int ret = avcEncoder.offerEncoder(bytes, h264);
                    if (ret > 0) {
                       //发送h264到vlc
                       netSendTask.pushBuf(h264, ret);
                    }
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    
        //切换前后摄像头
        public void change() {
            //切换前后摄像头
            Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
            for (int i = 0; i < Camera.getNumberOfCameras(); i++) {
                Camera.getCameraInfo(i, cameraInfo);
    
                if (cameraPosition == 1) {
                    if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
                        displayOrientation = 90;
                        cameraPosition = 0;
                        break;
                    }
                } else {
                    if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
                        displayOrientation = 90;
                        cameraPosition = 1;
                        break;
                    }
                }
            }
            destroyCamera();
            initCameara();
        }
    
    
    
    	//发送数据的线程
        class UdpSendTask extends Thread {
            private ArrayList<ByteBuffer> mList;
    
            public void init() {
                try {
                    socket = new DatagramSocket();
    				//设置IP
                    address = InetAddress.getByName("192.168.10.84");
                } catch (SocketException e) {
                    e.printStackTrace();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
    
                mList = new ArrayList<ByteBuffer>();
    
            }
    		
    		//添加数据
            public void pushBuf(byte[] buf, int len) {
                ByteBuffer buffer = ByteBuffer.allocate(len);
                buffer.put(buf, 0, len);
                mList.add(buffer);
            }
    
            @Override
            public void run() {
                Log.d(TAG, "fall in udp send thread");
                while (true) {
                    if (mList.size() <= 0) {
                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    while (mList.size() > 0) {
                        ByteBuffer sendBuf = mList.get(0);
                        try {
    					
    						//发送数据到指定地址
                            Log.d(TAG, "send udp packet len:" + sendBuf.capacity());
                            DatagramPacket packet = new DatagramPacket(sendBuf.array(), sendBuf.capacity(), address, 5000);
    
                            socket.send(packet);
                        } catch (Throwable t) {
                            t.printStackTrace();
                        }
    					//移除已经发送的数据
                        mList.remove(0);
                    }
                }
            }
        }
    }

布局文件

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        
        <SurfaceView
            android:id="@+id/sView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/video_bg" />
    
        <SurfaceView
            android:id="@+id/mView"
            android:layout_width="130dp"
            android:layout_height="200dp"
            android:background="@drawable/video_bg" />
    
    
    
        <ImageView
            android:id="@+id/change"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_alignParentRight="true"
            android:layout_marginRight="20dp"
            android:layout_marginTop="20dp"
            android:src="@drawable/a6o" />
    
    
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginBottom="30dp"
            android:gravity="center_horizontal"
            android:orientation="horizontal">
    
            <ImageButton
                android:id="@+id/record"
                android:layout_width="66dp"
                android:layout_height="66dp"
                android:scaleType="fitCenter" />
    
        </LinearLayout>
    </RelativeLayout>

编码工具类，这个是这个功能的核心。

package com.imsdk.utils;
    
    import android.annotation.SuppressLint;
    import android.graphics.Bitmap;
    import android.media.MediaCodec;
    import android.media.MediaCodecInfo;
    import android.media.MediaCodecList;
    import android.media.MediaFormat;
    import android.util.Log;
    
    import java.nio.ByteBuffer;
    
    /**
     * h264编码器
     *
     * @author：gj
     * @date: 2017/5/27
     * @time: 14:49
     **/
    public class AvcEncoder {
    
        private static final String TAG = "AvcEncoder";
    
        private MediaCodec mediaCodec;
        int m_width;//宽
        int m_height;//高
        int m_framerate;//帧率
    
        byte[] m_info = null;
        //转成后的数据
        private byte[] yuv420 = null;
        //旋转后的数据
        private byte[] rotateYuv420 = null;
    
        //编码类型
        private String mime = "video/avc";
    
        //pts时间基数
        long presentationTimeUs = 0;
    
    
        /**
         * 构造方法
         *
         * @param width
         * @param height
         * @param framerate 帧数
         * @param bitrate   码流  2500000
         */
        @SuppressWarnings("deprecation")
        @SuppressLint("NewApi")
        public AvcEncoder(int width, int height, int framerate, int bitrate) {
            m_width = width;
            m_height = height;
            m_framerate = framerate;
            //这里的大小要通过计算，而不是网上简单的 *3/2
            yuv420 = new byte[getYuvBuffer(width, height)];
            rotateYuv420 = new byte[getYuvBuffer(width, height)];
    
            //确定当前MediaCodec支持的图像格式
            int colorFormat = selectColorFormat(selectCodec(mime), mime);
    
            try {
                mediaCodec = MediaCodec.createEncoderByType(mime);
                //正常的编码出来是横屏的。因为手机本身采集的数据默认就是横屏的
                // MediaFormat mediaFormat = MediaFormat.createVideoFormat(mime, width, height);
                //如果你需要旋转90度或者270度，那么需要把宽和高对调。否则会花屏。因为比如你320 X 240，图像旋转90°之后宽高变成了240 X 320。
                MediaFormat mediaFormat = MediaFormat.createVideoFormat(mime, height, width);
                //设置参数
                mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, bitrate);
                mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, framerate);
                mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, colorFormat);  //COLOR_FormatYUV420SemiPlanar  COLOR_FormatYUV420Planar
                mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 5); //关键帧间隔时间 单位s
                mediaCodec.configure(mediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
                mediaCodec.start();
            } catch (Exception e) {
                e.printStackTrace();
            }
    
        }
    
        @SuppressLint("NewApi")
        public void close() {
            try {
                mediaCodec.stop();
                mediaCodec.release();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
    
        /**
         * 开始编码
         *
         * @author：gj
         * @date: 2017/5/27
         * @time: 14:55
         **/
        @SuppressLint("NewApi")
        public int offerEncoder(byte[] input, byte[] output) {
            int pos = 0;
            //这里根据你设置的采集格式调用。我这里是nv21
            //swapYV12toI420(input, yuv420, m_width, m_height);
            NV21ToNV12(input, rotateYuv420, m_width, m_height);
            //把视频逆时针旋转90度。（正常视觉效果）
            YUV420spRotate90Anticlockwise(rotateYuv420, yuv420, m_width, m_height);
            try {
                @SuppressWarnings("deprecation")
                ByteBuffer[] inputBuffers = mediaCodec.getInputBuffers();
                @SuppressWarnings("deprecation")
                ByteBuffer[] outputBuffers = mediaCodec.getOutputBuffers();
                int inputBufferIndex = mediaCodec.dequeueInputBuffer(-1);
                if (inputBufferIndex >= 0) {
                    ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
                    inputBuffer.clear();
                    inputBuffer.put(yuv420);
    
                    //计算pts，这个值是一定要设置的
                    long pts = computePresentationTime(presentationTimeUs);
    
                    mediaCodec.queueInputBuffer(inputBufferIndex, 0, yuv420.length, pts, 0);
                    presentationTimeUs += 1;
                }
    
                MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
                int outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);
    
                while (outputBufferIndex >= 0) {
                    ByteBuffer outputBuffer = outputBuffers[outputBufferIndex];
                    byte[] outData = new byte[bufferInfo.size];
                    outputBuffer.get(outData);
    
                    if (m_info != null) {
                        System.arraycopy(outData, 0, output, pos, outData.length);
                        pos += outData.length;
    
                    } else {
                        //保存pps sps 只有开始时 第一个帧里有， 保存起来后面用
                        ByteBuffer spsPpsBuffer = ByteBuffer.wrap(outData);
                        if (spsPpsBuffer.getInt() == 0x00000001) {
                            m_info = new byte[outData.length];
                            System.arraycopy(outData, 0, m_info, 0, outData.length);
                        } else {
                            return -1;
                        }
                    }
    
                    mediaCodec.releaseOutputBuffer(outputBufferIndex, false);
                    outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);
                }
    
                if (output[4] == 0x65) {
                    //key frame   编码器生成关键帧时只有 00 00 00 01 65 没有pps sps， 要加上
                    System.arraycopy(output, 0, yuv420, 0, pos);
                    System.arraycopy(m_info, 0, output, 0, m_info.length);
                    System.arraycopy(yuv420, 0, output, m_info.length, pos);
                    pos += m_info.length;
                }
    
            } catch (Throwable t) {
                t.printStackTrace();
            }
    
            return pos;
        }
    
    
        //-----------下面是常用的格式转换方法-----------------------------
    
        //yv12 转 yuv420p  yvu -> yuv,yuv420p就是I420格式，使用极其广泛
        private void swapYV12toI420(byte[] yv12bytes, byte[] i420bytes, int width, int height) {
            System.arraycopy(yv12bytes, 0, i420bytes, 0, width * height);
            System.arraycopy(yv12bytes, width * height + width * height / 4, i420bytes, width * height, width * height / 4);
            System.arraycopy(yv12bytes, width * height, i420bytes, width * height + width * height / 4, width * height / 4);
        }
    
        //选择了YUV420SP作为编码的目标颜色空间，其实YUV420SP就是NV12，咱们CAMERA设置的是NV21，所以需要转一下
        private void NV21ToNV12(byte[] nv21, byte[] nv12, int width, int height) {
            if (nv21 == null || nv12 == null) return;
            int framesize = width * height;
            int i = 0, j = 0;
            System.arraycopy(nv21, 0, nv12, 0, framesize);
            for (i = 0; i < framesize; i++) {
                nv12[i] = nv21[i];
            }
            for (j = 0; j < framesize / 2; j += 2) {
                nv12[framesize + j - 1] = nv21[j + framesize];
            }
            for (j = 0; j < framesize / 2; j += 2) {
                nv12[framesize + j] = nv21[j + framesize - 1];
            }
        }
    
        private void swapYV12toNV12(byte[] yv12bytes, byte[] nv12bytes, int width, int height) {
    
            int nLenY = width * height;
            int nLenU = nLenY / 4;
            System.arraycopy(yv12bytes, 0, nv12bytes, 0, width * height);
    //        for (int i = 0; i < nLenU; i++) {
    //            nv12bytes[nLenY + 2 * i] = yv12bytes[nLenY + i];
    //            nv12bytes[nLenY + 2 * i + 1] = yv12bytes[nLenY + nLenU + i];
    //        }
            for (int i = 0; i < nLenU; i++) {
                nv12bytes[nLenY + 2 * i + 1] = yv12bytes[nLenY + i];
                nv12bytes[nLenY + 2 * i] = yv12bytes[nLenY + nLenU + i];
            }
        }
    
        private void swapNV12toI420(byte[] nv12bytes, byte[] i420bytes, int width, int height) {
    
            int nLenY = width * height;
            int nLenU = nLenY / 4;
            System.arraycopy(nv12bytes, 0, i420bytes, 0, width * height);
            for (int i = 0; i < nLenU; i++) {
                i420bytes[nLenY + i] = nv12bytes[nLenY + 2 * i + 1];
                i420bytes[nLenY + nLenU + i] = nv12bytes[nLenY + 2 * i];
            }
        }
    
        public Bitmap rawByteArray2RGBABitmap2(byte[] data, int width, int height) {
            int frameSize = width * height;
            int[] rgba = new int[frameSize];
    
            for (int i = 0; i < height; i++)
                for (int j = 0; j < width; j++) {
                    int y = (0xff & ((int) data[i * width + j]));
                    int u = (0xff & ((int) data[frameSize + (i >> 1) * width + (j & ~1) + 0]));
                    int v = (0xff & ((int) data[frameSize + (i >> 1) * width + (j & ~1) + 1]));
                    y = y < 16 ? 16 : y;
    
                    int r = Math.round(1.164f * (y - 16) + 1.596f * (v - 128));
                    int g = Math.round(1.164f * (y - 16) - 0.813f * (v - 128) - 0.391f * (u - 128));
                    int b = Math.round(1.164f * (y - 16) + 2.018f * (u - 128));
    
                    r = r < 0 ? 0 : (r > 255 ? 255 : r);
                    g = g < 0 ? 0 : (g > 255 ? 255 : g);
                    b = b < 0 ? 0 : (b > 255 ? 255 : b);
    
                    rgba[i * width + j] = 0xff000000 + (b << 16) + (g << 8) + r;
                }
    
            Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            bmp.setPixels(rgba, 0, width, 0, 0, width, height);
            return bmp;
        }
    
    
        //计算YUV的buffer的函数，需要根据文档计算，而不是简单“*3/2”
        public int getYuvBuffer(int width, int height) {
            // stride = ALIGN(width, 16)
            int stride = (int) Math.ceil(width / 16.0) * 16;
            // y_size = stride * height
            int y_size = stride * height;
            // c_stride = ALIGN(stride/2, 16)
            int c_stride = (int) Math.ceil(width / 32.0) * 16;
            // c_size = c_stride * height/2
            int c_size = c_stride * height / 2;
            // size = y_size + c_size * 2
            return y_size + c_size * 2;
        }
    
    
        //通过mimeType确定支持的格式
        private int selectColorFormat(MediaCodecInfo codecInfo, String mimeType) {
            MediaCodecInfo.CodecCapabilities capabilities = codecInfo.getCapabilitiesForType(mimeType);
            for (int i = 0; i < capabilities.colorFormats.length; i++) {
                int colorFormat = capabilities.colorFormats[i];
                if (isRecognizedFormat(colorFormat)) {
                    return colorFormat;
                }
            }
            Log.e(TAG, "couldn't find a good color format for " + codecInfo.getName() + " / " + mimeType);
            return 0;   // not reached
        }
    
        private boolean isRecognizedFormat(int colorFormat) {
            switch (colorFormat) {
                // these are the formats we know how to handle for this test
                case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar:
                case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420PackedPlanar:
                case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420SemiPlanar:
                case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420PackedSemiPlanar:
                case MediaCodecInfo.CodecCapabilities.COLOR_TI_FormatYUV420PackedSemiPlanar:
                    return true;
                default:
                    return false;
            }
        }
    
        private MediaCodecInfo selectCodec(String mimeType) {
            int numCodecs = MediaCodecList.getCodecCount();
            for (int i = 0; i < numCodecs; i++) {
                MediaCodecInfo codecInfo = MediaCodecList.getCodecInfoAt(i);
    
                if (!codecInfo.isEncoder()) {
                    continue;
                }
    
                String[] types = codecInfo.getSupportedTypes();
                for (int j = 0; j < types.length; j++) {
                    if (types[j].equalsIgnoreCase(mimeType)) {
                        return codecInfo;
                    }
                }
            }
            return null;
        }
    
        /**
         * 计算视频pts
         */
        private long computePresentationTime(long frameIndex) {
            return 132 + frameIndex * 1000000 / m_framerate;
        }
    
        //顺时针旋转270度
        private void YUV420spRotate270(byte[] des, byte[] src, int width, int height) {
            int n = 0;
            int uvHeight = height >> 1;
            int wh = width * height;
            //copy y
            for (int j = width - 1; j >= 0; j--) {
                for (int i = 0; i < height; i++) {
                    des[n++] = src[width * i + j];
                }
            }
    
            for (int j = width - 1; j > 0; j -= 2) {
                for (int i = 0; i < uvHeight; i++) {
                    des[n++] = src[wh + width * i + j - 1];
                    des[n++] = src[wh + width * i + j];
                }
            }
        }
    
        //旋转180度（顺时逆时结果是一样的）
        private void YUV420spRotate180(byte[] src, byte[] des, int width, int height) {
    
            int n = 0;
            int uh = height >> 1;
            int wh = width * height;
            //copy y
            for (int j = height - 1; j >= 0; j--) {
                for (int i = width - 1; i >= 0; i--) {
                    des[n++] = src[width * j + i];
                }
            }
    
    
            for (int j = uh - 1; j >= 0; j--) {
                for (int i = width - 1; i > 0; i -= 2) {
                    des[n] = src[wh + width * j + i - 1];
                    des[n + 1] = src[wh + width * j + i];
                    n += 2;
                }
            }
        }
    
        //顺时针旋转90
        private void YUV420spRotate90Clockwise(byte[] src, byte[] dst, int srcWidth, int srcHeight) {
    //        int wh = width * height;
    //        int k = 0;
    //        for (int i = 0; i < width; i++) {
    //            for (int j = height - 1; j >= 0; j--) {
    //                des[k] = src[width * j + i];
    //                k++;
    //            }
    //        }
    //        for (int i = 0; i < width; i += 2) {
    //            for (int j = height / 2 - 1; j >= 0; j--) {
    //                des[k] = src[wh + width * j + i];
    //                des[k + 1] = src[wh + width * j + i + 1];
    //                k += 2;
    //            }
    //        }
    
            int wh = srcWidth * srcHeight;
            int uvHeight = srcHeight >> 1;
    
            //旋转Y
            int k = 0;
            for (int i = 0; i < srcWidth; i++) {
                int nPos = 0;
                for (int j = 0; j < srcHeight; j++) {
                    dst[k] = src[nPos + i];
                    k++;
                    nPos += srcWidth;
                }
            }
    
            for (int i = 0; i < srcWidth; i += 2) {
                int nPos = wh;
                for (int j = 0; j < uvHeight; j++) {
                    dst[k] = src[nPos + i];
                    dst[k + 1] = src[nPos + i + 1];
                    k += 2;
                    nPos += srcWidth;
                }
            }
    
        }
    
        //逆时针旋转90
        private void YUV420spRotate90Anticlockwise(byte[] src, byte[] dst, int width, int height) {
            int wh = width * height;
            int uvHeight = height >> 1;
    
            //旋转Y
            int k = 0;
            for (int i = 0; i < width; i++) {
                int nPos = width - 1;
                for (int j = 0; j < height; j++) {
                    dst[k] = src[nPos - i];
                    k++;
                    nPos += width;
                }
            }
    
            for (int i = 0; i < width; i += 2) {
                int nPos = wh + width - 1;
                for (int j = 0; j < uvHeight; j++) {
                    dst[k] = src[nPos - i - 1];
                    dst[k + 1] = src[nPos - i];
                    k += 2;
                    nPos += width;
                }
            }
    
            //不进行镜像翻转
    //        for (int i = 0; i < width; i++) {
    //            int nPos = width - 1;
    //            for (int j = 0; j < height; j++) {
    //                dst[k] = src[nPos - i];
    //                k++;
    //                nPos += width;
    //            }
    //        }
    //        for (int i = 0; i < width; i += 2) {
    //            int nPos = wh + width - 2;
    //            for (int j = 0; j < uvHeight; j++) {
    //                dst[k] = src[nPos - i];
    //                dst[k + 1] = src[nPos - i + 1];
    //                k += 2;
    //                nPos += width;
    //            }
    //        }
    
        }
    
        //镜像
        private void Mirror(byte[] yuv_temp, int w, int h) {
            int i, j;
    
            int a, b;
            byte temp;
            //mirror y
            for (i = 0; i < h; i++) {
                a = i * w;
                b = (i + 1) * w - 1;
                while (a < b) {
                    temp = yuv_temp[a];
                    yuv_temp[a] = yuv_temp[b];
                    yuv_temp[b] = temp;
                    a++;
                    b--;
                }
            }
            //mirror u
            int uindex = w * h;
            for (i = 0; i < h / 2; i++) {
                a = i * w / 2;
                b = (i + 1) * w / 2 - 1;
                while (a < b) {
                    temp = yuv_temp[a + uindex];
                    yuv_temp[a + uindex] = yuv_temp[b + uindex];
                    yuv_temp[b + uindex] = temp;
                    a++;
                    b--;
                }
            }
            //mirror v
            uindex = w * h / 4 * 5;
            for (i = 0; i < h / 2; i++) {
                a = i * w / 2;
                b = (i + 1) * w / 2 - 1;
                while (a < b) {
                    temp = yuv_temp[a + uindex];
                    yuv_temp[a + uindex] = yuv_temp[b + uindex];
                    yuv_temp[b + uindex] = temp;
                    a++;
                    b--;
                }
            }
        }
    }

解码工具类

package com.imsdk.utils;
    
    import android.media.MediaCodec;
    import android.media.MediaFormat;
    import android.util.Log;
    import android.view.Surface;
    
    import java.io.IOException;
    import java.nio.ByteBuffer;
    
    /**
     * h264解码器，相对编码器要简单
     *
     * @author：gj
     * @date: 2017/5/27
     * @time: 14:59
     **/
    public class AvcDecode {
    
        //解码类型
        String MIME_TYPE = "video/avc";
    
        MediaCodec mediaCodec = null;//这里是建立的解码器
    
        ByteBuffer[] inputBuffers = null;
        int m_framerate = 10;//帧率
    
        //pts时间基数
        long presentationTimeUs = 0;
    
        public AvcDecode(int mWidth, int mHeigh, Surface surface) {
    
            MediaFormat mediaFormat = MediaFormat.createVideoFormat(
                    MIME_TYPE, mWidth, mHeigh);
            try {
                mediaCodec = MediaCodec.createDecoderByType(MIME_TYPE);
                mediaCodec.configure(mediaFormat, surface, null, 0);//注意上面编码器的注释，看看区别
                mediaCodec.start();
            } catch (IOException e) {
                e.printStackTrace();
            }
            inputBuffers = mediaCodec.getInputBuffers();
        }
    
    
        public boolean decodeH264(byte[] h264) {
            // Get input buffer index
            ByteBuffer[] inputBuffers = mediaCodec.getInputBuffers();
            int inputBufferIndex = mediaCodec.dequeueInputBuffer(100);//-1表示等待
    
            if (inputBufferIndex >= 0) {
                ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
                inputBuffer.clear();
                inputBuffer.put(h264);
    
                //计算pts
                long pts = computePresentationTime(presentationTimeUs);
                mediaCodec.queueInputBuffer(inputBufferIndex, 0, h264.length, pts, 0);
                presentationTimeUs += 1;
    
            } else {
                return false;
            }
    
            // Get output buffer index
            MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
            int outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 100);
            while (outputBufferIndex >= 0) {
                mediaCodec.releaseOutputBuffer(outputBufferIndex, true);//到这里为止应该有图像显示了
                outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);
            }
            Log.e("Media", "onFrame end");
            return true;
    
        }
    
        /**
         * 计算pts
         */
        private long computePresentationTime(long frameIndex) {
            return 132 + frameIndex * 1000000 / m_framerate;
        }
    }

需要测试的，可以自己下一个VLC客户端安装。然后设置一下，如下图：

先点击工具-->首选项

![Center][]

然后点 媒体-->打开网络串流 ，输入地址播放就可以了。 我这里的 端口是5000，因为是本机，所以省略了IP：udp://@:5000

![Center 1][]

发送你的数据就能看到视频了

应项目无法全部给出，这里给出关键源码部分，请谅解：http://download.csdn.net/download/kokjuis/9990177

[Center]: /images/20220615/a41cf31a8b5f4cb0b8d78de24c452478.png
[Center 1]: /images/20220615/5377839642f4420d9c9fd64a1e661f1d.png