【流媒體】Android 即時視頻採集—MediaRecoder錄製

文章目錄

• ① MediaRecoder使用
• ② LocalSocket使用
• ③ MediaRecorder相關

【流媒體】Android 即時視頻採集—MediaRecoder錄製

SkySeraph Mar 31st 2012

Email：zgzhaobo@gmail.com    QQ：452728574

0 囉嗦

　　本篇的存在只是為系列的連貫性，其實在前面系列博文中對MediaRecoder已有用到，詳見前面Android系列博文Android(19)

1 概述

　　通過Android的MediaRecorder，在SetoutputFile函數中綁定LocalSocket實現

2 知識點① MediaRecoder使用

　　參考 【Android學習專題】多媒體篇：MediaRecorder 實現錄音機

② LocalSocket使用

　　在手機中實現資料的邊發送邊接收。

詳細參考：http://api.apkbus.com/reference/android/net/LocalSocket.html

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

3 核心源碼① SurfaceView相關

　　參考 【流媒體】Android 即時視頻採集—Camera預覽採集 和 【Android學習專題】多媒體篇：MediaRecorder 實現錄音機

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相關

參考：【Android學習專題】多媒體篇：MediaRecoder 實現錄影機  和 【Android學習專題】多媒體篇：MediaRecorder 實現錄音機

另附initiativeVideo核心模組

private boolean initializeVideo()
    {
try
        {
            Log.i(TAG,"##initializeVideo....");
// 〇state: Initial 執行個體化MediaRecorder對象
            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
// 設定錄製視頻輸出格式
//     THREE_GPP:    3gp格式，H263視頻ARM音頻編碼
//    MPEG-4:        MPEG4 media file format
//    RAW_AMR:    只支援音頻且音頻編碼要求為AMR_NB
//    AMR_NB:        
//    ARM_MB:        
//    Default:    
// 3gp or mp4
//Android支援的音頻編解碼僅為AMR_NB；支援的視頻編解碼僅為H263，H264隻支援解碼；支援對JPEG編解碼；輸出格式僅支援.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");

// 設定視頻/音頻檔案的編碼：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);

// 設定視頻錄製的解析度。必須放在設定編碼和格式的後面，否則報錯
//mMediaRecorder.setVideoSize(176, 144);
            mMediaRecorder.setVideoSize(320, 240);
//mMediaRecorder.setVideoSize(720, 480);    
            Log.i(TAG, "Video：Current Video Size: "+"320*240\n");

// 設定錄製的視訊框架率。必須放在設定編碼和格式的後面，否則報錯
            mMediaRecorder.setVideoFrameRate(FRAME_RATE);    

// 預覽
            mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());    

// 設定輸出檔案方式： 直接本機存放區   or LocalSocket遠程輸出
            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()); //設定以流方式輸出 
                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

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