音视频采集

桃扇骨 2022-06-18 09:09 357阅读 0赞

原文：[http://www.cnblogs.com/tjpfly/archive/2011/06/08/2074735.html][http_www.cnblogs.com_tjpfly_archive_2011_06_08_2074735.html]

第一步：在功能清单文件AndroidManifest.xml中添加音频刻录和照相机权限：

<uses-permission android:name="android.permission.RECORD\_AUDIO"/>

<uses-permission android:name="android.permission.CAMERA"/>

<uses-permission android:name="android.permission.MOUNT\_UNMOUNT\_FILESYSTEMS"/>

<uses-permission android:name="android.permission.WRITE\_EXTERNAL\_STORAGE"/>

第二步：编写音频刻录代码:

recorder.reset();

recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); //从照相机采集视频

recorder.setAudioSource(MediaRecorder.AudioSource.MIC);

recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE\_GPP);

recorder.setVideoSize(320, 240);

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);

recorder.setOutputFile("/mnt/sdcard/itcast.3gp");

recorder.setPreviewDisplay(surfaceView.getHolder().getSurface());

recorder.prepare();//预期准备

recorder.start();//开始刻录

...

recorder.stop();//停止刻录

recorder.release(); //刻录完成一定要释放资源

strings.xml

<?xml version="1.0" encoding="utf-8"?>
    <resources>
        <string name="hello">Hello World, VideoRecordActivity!</string>
        <string name="app_name">视频刻录</string>
        <string name="record">刻录</string>
        <string name="stop">停止</string>
        <string name="success">刻录完成</string>
        <string name="error">刻录失败</string>
        <string name="sdcarderror">SDCARD不存在或者写保护</string>
    </resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.tjp.videorecord"
          android:versionCode="1"
          android:versionName="1.0">
        <uses-sdk android:minSdkVersion="7" />
    
        <application android:icon="@drawable/icon" android:label="@string/app_name" >
            <activity android:name=".VideoRecordActivity"
                      android:label="@string/app_name" android:screenOrientation="landscape">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
    
        </application>
        
        <uses-permission android:name="android.permission.RECORD_AUDIO"/>
        
        <uses-permission android:name="android.permission.CAMERA"/>
        
        <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
        
    </manifest>

main.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#ffffff"
        >
    <SurfaceView  
        android:layout_width="fill_parent" 
        android:layout_height="220dip" 
        android:id="@+id/surfaceview"
        />
    <LinearLayout 
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="right"
        >
        <Button  
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:id="@+id/record"
        android:text="@string/record"
        />
        <Button  
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_marginLeft="10dip"
        android:id="@+id/stop"
        android:text="@string/stop"
        />
    </LinearLayout>
    </LinearLayout>

VideoRecordActivity

package com.tjp.videorecord;
    
    import android.app.Activity;
    import android.media.MediaRecorder;
    import android.os.Bundle;
    import android.os.Environment;
    import android.util.Log;
    import android.view.SurfaceHolder;
    import android.view.SurfaceView;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.Toast;
    
    public class VideoRecordActivity extends Activity {
        
        private SurfaceView surfaceView;
        private MediaRecorder recorder; 
        private boolean record=false;
        private static final String TAG="VideoRecordActivity";
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            surfaceView=(SurfaceView)findViewById(R.id.surfaceview);
            Button stopButton=(Button)findViewById(R.id.stop);
            Button recordButton=(Button)findViewById(R.id.record);
            ButtonClickListiner buttonClickListiner=new ButtonClickListiner();
            stopButton.setOnClickListener(buttonClickListiner);
            recordButton.setOnClickListener(buttonClickListiner);
            /*下面设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前*/
            this.surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
            this.surfaceView.getHolder().setFixedSize(320, 240);//设置分辨率
            this.surfaceView.getHolder().setKeepScreenOn(true);
    
        }
        
        @Override
        protected void onDestroy() {
            recorder.release();
            super.onDestroy();
        }
    
        private final class ButtonClickListiner implements OnClickListener{
    
            @Override
            public void onClick(View v) {
                if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                    Toast.makeText(VideoRecordActivity.this, R.string.sdcarderror, Toast.LENGTH_SHORT).show();
                }
                try {
                    switch (v.getId()) {
                    case R.id.stop:
                        if(record){
                            recorder.stop();
                            record=false;
                        }
                        break;
                    case R.id.record:
                        recorder.reset();                
                        recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); //从照相机采集视频
                        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);             
                        recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                        recorder.setVideoSize(320, 240);
                        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);    
                        recorder.setOutputFile("/mnt/sdcard/tjp.3gp");            
                        recorder.setPreviewDisplay(surfaceView.getHolder().getSurface());
                        recorder.prepare();//预期准备
                        recorder.start();//开始刻录
                        record=true;
                        break;
    
                    default:
                        break;
                    }
                } catch (Exception e) {
                    Log.i(TAG, e.getMessage());
                    Toast.makeText(VideoRecordActivity.this, R.string.error, Toast.LENGTH_SHORT).show();
                }
                
            }
            
        }
    }

[http_www.cnblogs.com_tjpfly_archive_2011_06_08_2074735.html]: http://www.cnblogs.com/tjpfly/archive/2011/06/08/2074735.html