【流媒體】Android 实时视频采集—MediaRecoder录制

---

【流媒體】Android 实时视频采集—MediaRecoder录制

SkySeraph Mar 31st 2012

Email：skyseraph00@163.com 

流媒体系列： http://skyseraph.com/2012/04/11/Media/流媒体专题/ 

0 啰嗦

　　本篇的存在只是为系列的连贯性，其实在前面系列博文中对MediaRecoder已有用到，详见前面Android系列博文Android(19)

---

1 概述

　　通过Android的MediaRecorder，在SetoutputFile函数中绑定LocalSocket实现

---

2 知识点

① MediaRecoder使用

　　参考 【Android學習專題】多媒體篇：MediaRecorder 实现录音机

② LocalSocket使用

　　在手机中实现数据的边发送边接收。

详细参考：http://api.apkbus.com/reference/android/net/LocalSocket.html

http://api.apkbus.com/reference/android/net/LocalServerSocket.html

---

3 核心源码

① SurfaceView相关

　　参考 【流媒體】Android 实时视频采集—Camera预览采集 和 【Android學習專題】多媒體篇：MediaRecorder 实现录音机

② Init LocalSocket

    private void initLocalSocket()
    {
        receiver = new LocalSocket();
        try
        {
            lss = new LocalServerSocket("H264");
            receiver.connect(new LocalSocketAddress("H264"));
            receiver.setReceiveBufferSize(500000);
            receiver.setSendBufferSize(500000);
            sender = lss.accept();
            sender.setReceiveBufferSize(500000);
            sender.setSendBufferSize(500000);
        } catch (IOException e1)
        {
            e1.printStackTrace();
            Log.e("", "localSocket error:" + e1.getMessage());
        }
    }

③ MediaRecorder相关

参考：【Android學習專題】多媒體篇：MediaRecoder 实现录像机  和 【Android學習專題】多媒體篇：MediaRecorder 实现录音机

另附initiativeVideo核心模块

private boolean initializeVideo()
    {
        try
        {
            Log.i(TAG,"##initializeVideo....");
            // 〇state: Initial 实例化MediaRecorder对象
            if (mSurfaceView == null)
            {
                Log.e(TAG,"mSurfaceView is null in initializeVideo");
                return false;
            }
            if(mMediaRecorder == null)
                mMediaRecorder = new MediaRecorder();
            else
                mMediaRecorder.reset();                
                    
            // 〇state: Initial=>Initialized
            // set audio source as Microphone, video source as camera
            // specified before settings Recording-parameters or encoders，called only before setOutputFormat
            mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); 
            //mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            
            // 〇state: Initialized=>DataSourceConfigured
            // 设置錄製視頻输出格式
            //     THREE_GPP:    3gp格式，H263视频ARM音频编码
            //    MPEG-4:        MPEG4 media file format
            //    RAW_AMR:    只支持音频且音频编码要求为AMR_NB
            //    AMR_NB:        
            //    ARM_MB:        
            //    Default:    
            // 3gp or mp4
            //Android支持的音频编解码仅为AMR_NB；支持的视频编解码仅为H263，H264只支持解码；支持对JPEG编解码；输出格式仅支持.3gp和.mp4
            String lVideoFileFullPath;    
            lVideoFileFullPath = ".3gp"; //.mp4
            mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);    
            //mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            Log.i(TAG, "Video：Current container format: "+"3GP\n");
            
            // 设置視頻/音频文件的编码：AAC/AMR_NB/AMR_MB/Default
            //    video: H.263, MP4-SP, or H.264    
            mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
            //mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);
            //mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
            Log.i(TAG, "Video：Current encoding format: "+"H264\n");
                        
            // audio: AMR-NB
            //mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
            
            // 设置视频录制的分辨率。必须放在设置编码和格式的后面，否则报错
            //mMediaRecorder.setVideoSize(176, 144);
            mMediaRecorder.setVideoSize(320, 240);
            //mMediaRecorder.setVideoSize(720, 480);    
            Log.i(TAG, "Video：Current Video Size: "+"320*240\n");
                        
            // 设置录制的视频帧率。必须放在设置编码和格式的后面，否则报错
            mMediaRecorder.setVideoFrameRate(FRAME_RATE);    
            
            // 预览
            mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());    
            
            // 设置输出文件方式： 直接本地存储   or LocalSocket远程输出
            if(bIfNativeORRemote)    //Native
            {
                lVideoFileFullPath = strRecVideoFilePath + String.valueOf(System.currentTimeMillis()) + lVideoFileFullPath;
                mRecVideoFile = new File(lVideoFileFullPath);
                // mMediaRecorder.setOutputFile(mRecVideoFile.getAbsolutePath());
                mMediaRecorder.setOutputFile(mRecVideoFile.getPath());    //called after set**Source before prepare
                Log.i(TAG, "start write into file~");
            }
            else    //Remote
            {
                mMediaRecorder.setOutputFile(sender.getFileDescriptor()); //设置以流方式输出 
                Log.i(TAG, "start send into sender~");
            }
            
            // 
            mMediaRecorder.setMaxDuration(0);//called after setOutputFile before prepare,if zero or negation,disables the limit
            mMediaRecorder.setMaxFileSize(0);//called after setOutputFile before prepare,if zero or negation,disables the limit
            try
            {     
                mMediaRecorder.setOnInfoListener(this);
                mMediaRecorder.setOnErrorListener(this);
                // 〇state: DataSourceConfigured => prepared
                mMediaRecorder.prepare();
                // 〇state: prepared => recording
                mMediaRecorder.start();
                bIfRecInProcess = true;
                Log.i(TAG, "initializeVideo Start!");
            } catch (Exception e)
            {        
                releaseMediaRecorder();
                finish();
                e.printStackTrace();
            }
            return true;
        } catch (Exception e)
        {
            // TODO: handle exception
            e.printStackTrace();
            return false;
        }
    }

---

Refs/Related

 　　见文中链接