live555 client多线程化

2014-03-11 22:18:54 

为了让live555 client在线程中使用，就必须让env/task之类的独立化。做法是把相关的内容放在一个class内，必要的地方lock就好了。

一、大概

如下：

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//global,live555库的一些基本类
struct MYRTSPClient
{
    TaskScheduler* pTaskScheduler;
    UsageEnvironment* pEnv;
    RTSPClient* pClient;
    MediaSession *pMediaSession;
    MediaSubsessionIterator *iter;
    Boolean bMadeProgress;
    unsigned fileSinkBufferSize;
    unsigned socketInputBufferSize;
    Boolean  bStreamUsingTCP;
    Authenticator* pAuthenticator;
    char     m_cEventLoop;
    ploginfo pLogInfo;
 
    MYRTSPClient()
    {
        pClient = NULL;
        pMediaSession = NULL;
        iter = NULL;
        bMadeProgress = False;
        fileSinkBufferSize = MAX_VGA_LEN;
        socketInputBufferSize = 524288;
        bStreamUsingTCP = False;
        pAuthenticator = NULL;
        m_cEventLoop = 0;
        pLogInfo = new loginfo();
    }
    MYRTSPClient(RTSPClient *client)
    {
        pClient = client;
        pMediaSession = NULL;
        iter = NULL;
        bMadeProgress = False;
        fileSinkBufferSize = MAX_VGA_LEN;
        socketInputBufferSize = 524288;
        bStreamUsingTCP = False;
        pAuthenticator = NULL;
        m_cEventLoop = 0;
        pLogInfo = new loginfo();
    }
};

二、细节

live555中有太多的static func，初衷是为了方便客户不必关心类就可以定制自己的需求。但在多线程环境中，就要考虑了，static func要么可重入(幸运的是live555的static func都是可重入的)，要么在具有"类原子操作"的地方加锁。

从重要的static func说起。

1、static void afterGetting(FramedSource* source)
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class FramedSource: public MediaSource {
 
static void afterGetting(FramedSource* source);
    // doGetNextFrame() should arrange for this to be called after the
    // frame has been read (*iff* it is read successfully)
}










posted @ 2016-03-26 22:02  自由度  Views(1048)  Comments(0)    收藏  举报