视频录制机

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最新推荐文章于 2024-12-09 14:39:35 发布

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本文介绍了一个使用Android平台开发视频录制应用的过程，通过MediaRecorder类实现从摄像头采集视频并保存到SD卡的功能。

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//视频录制机

//就是用照相机的功能,把预览到的画面和声音,持久化的保存到sd卡上.

package cn.itcast.videorecoder;

import java.io.IOException;

import android.app.Activity;
import android.hardware.Camera;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;

public class DemoActivity extends Activity implements OnClickListener {
	private Button bt_start, bt_stop;
	private SurfaceView sv;
	private SurfaceHolder holder;
	private Camera  camera;
	MediaRecorder recorder;
		
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //隐藏掉activity的标题栏 
        // 必须写到setcontentview之前 
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        //实现窗体的全屏显示
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
       
        setContentView(R.layout.main);
        bt_start = (Button) this.findViewById(R.id.bt_start);
        bt_stop =(Button)this.findViewById(R.id.bt_stop);
        bt_start.setOnClickListener(this);
        bt_stop.setOnClickListener(this);
        sv = (SurfaceView) this.findViewById(R.id.sv);
        holder = sv.getHolder();
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        holder.addCallback(new MySurfaceCallback());
    }

    private class MySurfaceCallback implements SurfaceHolder.Callback{

		public void surfaceCreated(SurfaceHolder holder) {
			System.out.println("surface oncreate");
			DemoActivity.this.holder = holder;
/*			camera = Camera.open();
			try {
				camera.setPreviewDisplay(holder);
			} catch (IOException e) {
				e.printStackTrace();
			}
			camera.startPreview();*/
		}

		public void surfaceChanged(SurfaceHolder holder, int format, int width,
				int height) {
			// TODO Auto-generated method stub
			
		}

		public void surfaceDestroyed(SurfaceHolder holder) {
			System.out.println("surface destroy");
		/*	camera.release();
			camera = null;*/
		}
    	
    }
    
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.bt_start:
			bt_start.setEnabled(false);
			bt_stop.setEnabled(true);
			//得到媒体刻录机
			recorder = new MediaRecorder();
/*			recorder.reset();
//			recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
			recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
			recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
//			recorder.setAudioChannels(2);
//			recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
			recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
			recorder.setVideoSize(320, 240);
			recorder.setVideoFrameRate(3); //每秒3帧

			recorder.setOutputFile("/mnt/sdcard/itcast.3gp");
			recorder.setPreviewDisplay(holder.getSurface());
			try {
				recorder.prepare();
			} catch (IllegalStateException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}//预期准备
			recorder.start();//开始刻录
*/
			recorder.reset();
			recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); //从照相机采集视频 video 视频
			recorder.setAudioSource(MediaRecorder.AudioSource.MIC); //audio音频     麦克风(microphone)
			recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
			recorder.setVideoSize(720, 480);
			recorder.setVideoFrameRate(3); //每秒3帧
			recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263); //设置视频编码方式
			recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//设置音频编码方式
			recorder.setOutputFile("/mnt/sdcard/itcast.3gp");
			recorder.setPreviewDisplay(holder.getSurface());
			try {
				recorder.prepare();
			} catch (IllegalStateException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}//预期准备
			recorder.start();//开始刻录
			break;

		case R.id.bt_stop:
			bt_start.setEnabled(true);
			bt_stop.setEnabled(false);
			if(recorder!=null){
				recorder.stop();
				recorder.release();
				recorder = null;
			}
			
			break;
		}
		
	}
}