[Streaming media] Android real-time video encoding-H.264 hard Encoding

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[Streaming media] Android real-time video encoding-H.264 hard Encoding

Skyseraph APR 4-th 2012

Email: zgzhaobo@gmail.com QQ: 452728574

1 Hard Coding & Soft Encoding

Hard Coding: By callingAndroidCAmeraVideo Recording actually calls the underlying HD encoding hardware module, that is, the video card.CPU, Fast

Soft Encoding: Use CPU Encoding, such as common C/C ++ CodeGenerally, the binary files generated by compilation are all at a low speed. For example Android ndk Compile H264 Generate So Library, write JNI Interface, and then use Java Call So Library.

 

2 Principle

① Process: Use mediarecoder to collect videos and map the video streams to localsocket for sending and receiving.

② Principle: See [streaming media] H264-MP4 format and extraction of h264 in MP4 files SPS, PPs and code stream and "[streaming media] Android real-time video acquisition-mediarecoder recording"

 

3 Core code ① Mediarecoder Video collection

Video collection uses the mediarecorde recording method. For details, refer to "[streaming media] Android real-time video collection-mediarecoder recording"

 

② In Initiativevideo Medium Setoutputfile Set output in streaming mode

 

             //  Set the output file mode: local storage or localsocket remote output  
              If (Bifnativeorremote = True )//  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 ()); //  Set output in streaming mode  
 Log. I (TAG, "Start send into sender ~ ");
}

③ Startrecording

Function:Use this function to start a thread to map video streamsLocalsocketAnd code

 
Private VoidStartrecording ()
{
Log. I (TAG, "# startrecording ....");
NewThread (This). Start ();
}
 

Run:

@ Override
 Public   Void Run ()
{
Log. I (TAG, "# Run ....");

 //  Defines  
 Datainputstream = Null ;
 Int Offset = 0, TMP = 0, beleft = 0;

 Try 
{
Datainputstream = New Datainputstream (ER er. getinputstream ());
} Catch (Ioexception E2)
{
//  Todo auto-generated Catch Block  
 E2.printstacktrace ();
}
 Try 
{
Thread. currentthread (). Sleep (500 );
} Catch (Interruptedexception E1)
{
E1.printstacktrace ();
}

 //  ① Method 1: to view a pre-recorded video, you must skip the first 32 bytes of mdat (different hardware platforms !) 
          Try 
{
Datainputstream. Read (hsf-frame, 0, 32 );
Log. I (TAG, "Read mdat from ");
} Catch (Ioexception E1)
{
 //  Todo auto-generated Catch Block  
 E1.printstacktrace ();
}
 //  Method 2: Automated Search (to be supplemented)  
                 

 Try 
{
Hsf-fileoutputstream = New Fileoutputstream ("/sdcard/AVSS/h264.264 "); //  264 code streams  
 Log. I (TAG, "hsf-fileoutputstream ");
} Catch (Filenotfoundexception E)
{
 //  Todo auto-generated Catch Block  
 E. printstacktrace ();
}
 Try 
{
Hsf-fileoutputstream. Write (hsf-head );
Hsf-fileoutputstream. Write (hsf-sps );
Hsf-fileoutputstream. Write (hsf-head );
Hsf-fileoutputstream. Write (hsf-pps );
Log. I (TAG, "Run-write SPS/PPS to file ");
} Catch (Ioexception E1)
{
 //  Todo auto-generated Catch Block  
 E1.printstacktrace ();
}

 While (Bifrecinprocess &&(! Bifnativeorremote ))
{
 Try 
{
Log. I (TAG, "** while ...");
 Int Hsf-length = datainputstream. readint ();
Log. I (TAG, "hsf-length:" + hsf-length );
TMP = 0; offset = 0; beleft = 0;

Hsf-fileoutputstream. Write (hsf-head );
 While (Offset {
Beleft = hsf-length-offset;
TMP = datainputstream. Read (hsf-frame, 0, read_size <beleft? Read_size: beleft );
Log. I (TAG, String. Format ("h264% d, % d, % d", hsf-length, offset, TMP ));
Offset + = TMP;
Hsf-fileoutputstream. Write (hsf-frame, 0, TMP );
}

} Catch (Exception E)
{
 //  Todo: handle exception  
 E. printstacktrace ();
}
}
 //  
 }

4 ref/related

1Http://blog.csdn.net/zblue78/article/details/6078040

2Http://blog.csdn.net/zblue78/article/details/6083374

3Http://www.docin.com/p-282454756.html

4Http://blog.csdn.net/qwertyuj/article/details/7029836

Http://www.cnblogs.com/skyseraph/archive/2012/03/31/2427593.html

Http://www.cnblogs.com/skyseraph/archive/2012/03/23/2415018.html

7 http://www.cnblogs.com/skyseraph/archive/2012/04/01/2429384.html