【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

 

 

posted @ 2012-03-31 20:42 SkySeraph 阅读(...) 评论(...) 编辑 收藏