本文实例为大家分享了Android使用MediaCodec将摄像头采集的视频编码为h264，供大家参考，具体内容如下

MainActivity.java

import android.app.Activity;
import android.graphics.ImageFormat;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PreviewCallback;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import java.io.IOException;
import java.util.concurrent.ArrayBlockingQueue;

public class MainActivity extends Activity implements SurfaceHolder.Callback,PreviewCallback{

  private SurfaceView surfaceview;

  private SurfaceHolder surfaceHolder;

  private Camera camera;

  private Parameters parameters;

  int width = 1280;

  int height = 720;

  int framerate = 30;

  int biterate = 8500*1000;

  private static int yuvqueuesize = 10;

  //待解码视频缓冲队列，静态成员！
  public static ArrayBlockingQueue<byte[]> YUVQueue = new ArrayBlockingQueue<byte[]>(yuvqueuesize);

  private AvcEncoder avcCodec;


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    surfaceview = (SurfaceView)findViewById(R.id.surfaceview);
    surfaceHolder = surfaceview.getHolder();
    surfaceHolder.addCallback(this);
  }


  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    camera = getBackCamera();
    startcamera(camera);
    //创建AvEncoder对象
    avcCodec = new AvcEncoder(width,height,framerate,biterate);
    //启动编码线程
    avcCodec.StartEncoderThread();

  }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    if (null != camera) {
      camera.setPreviewCallback(null);
      camera.stopPreview();
      camera.release();
      camera = null;
      avcCodec.StopThread();
    }
  }


  @Override
  public void onPreviewFrame(byte[] data, android.hardware.Camera camera) {
    //将当前帧图像保存在队列中
    putYUVData(data,data.length);
  }

  public void putYUVData(byte[] buffer, int length) {
    if (YUVQueue.size() >= 10) {
      YUVQueue.poll();
    }
    YUVQueue.add(buffer);
  }


  private void startcamera(Camera mCamera){
    if(mCamera != null){
      try {
        mCamera.setPreviewCallback(this);
        mCamera.setDisplayOrientation(90);
        if(parameters == null){
          parameters = mCamera.getParameters();
        }
        //获取默认的camera配置
        parameters = mCamera.getParameters();
        //设置预览格式
        parameters.setPreviewFormat(ImageFormat.NV21);
        //设置预览图像分辨率
        parameters.setPreviewSize(width, height);
        //配置camera参数
        mCamera.setParameters(parameters);
        //将完全初始化的SurfaceHolder传入到setPreviewDisplay(SurfaceHolder)中
        //没有surface的话，相机不会开启preview预览
        mCamera.setPreviewDisplay(surfaceHolder);
        //调用startPreview()用以更新preview的surface，必须要在拍照之前start Preview
        mCamera.startPreview();

      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

  private Camera getBackCamera() {
    Camera c = null;
    try {
      //获取Camera的实例
      c = Camera.open(0);
    } catch (Exception e) {
      e.printStackTrace();
    }
    //获取Camera的实例失败时返回null
    return c;
  }


}