基于Linux电视棒实现DLNA和airplay功能
出发点：Android电视棒实现DLNA功能采用JAVA版本的cyberlink的话，缺点明显，SSDP协议设备发现有延时（有时还发现不了设备）体验差，基于Linux电视棒可以控制硬件成本在100元以下，而且c语言实现的cyberlink DLNA协议栈不存在设备发现不了的情况，本文记录记录linux下实现dlna碰到的一揽子问题
1. DLNA的DMR方案
方案1： MediaGateForCC (http://www.cybergarage.org/twiki/bin/view/Main/MediaGateForCC) 交叉编译，基于gstreamer实现播放器
Cyberlink协议栈需要依赖xml库, 可以选择xerces和libxml2, xerces是apatch提供的一个比较庞大的xml解析库，嵌入式设备不考虑。
1） 编译libxml2
./configure --prefix=/home/work/mylib --host=mips-linux-gnu --build=i686 --target=mips-linux-gnu CC=mips-linux-gnu-gcc -EL CFLAGS=-I/home/work/mylib/include LDFLAGS=-L/home/work/mylib/lib
2）编译MediaGateForCC
./configure --prefix=/home/work/mylib --host=mips-linux-gnu --build=i686 --target=mips-linux-gnu CC=mips-linux-gnu-gcc -EL --enable-libxml2 CFLAGS=-I/home/work/mylib/include CPPFLAGS=-I/home/work/mylib/include LDFLAGS=-L/home/work/mylib/lib
错误1：LibXml2Parser.cpp中Node *newChildNode = convertToCLinkFormat( doc, child, depth 1)改成Node *newChildNode = convertToCLinkFormat( doc, child, depth );
错误2：ControlPoint.cpp中Device **dev = new (Device(*[devCnt])); 改成 Device **dev = new Device* [devCnt];
编译成功
3） CyberLink中没有实现Media Renderer的AVTransport和RenderingControl服务，以下是补充的AVTransport..h和RenderingControl.h
class AVT : public ActionListener, public QueryListener
{
CyberUtil::Mutex mutex;
int maxConnectionID;
////////////////////////////////////////////////
// Constants
////////////////////////////////////////////////
public:
static const char *DESCRIPTION;
static const char *SERVICE_TYPE;
static const char * TRANSPORTSTATE ;
static const char * TRANSPORTSTATUS ;
static const char * PLAYBACKSTORAGEMEDIUM;
static const char * RECORDSTORAGEMEDIUM;
static const char * POSSIBLEPLAYBACKSTORAGEMEDIA;
static const char * POSSIBLERECORDSTORAGEMEDIA;
static const char * CURRENTPLAYMODE ;
static const char * TRANSPORTPLAYSPEED;
static const char * RECORDMEDIUMWRITESTATUS ;
static const char * CURRENTRECORDQUALITYMODE ;
static const char * POSSIBLERECORDQUALITYMODES;
static const char * NUMBEROFTRACKS;
static const char * CURRENTTRACK;
static const char * CURRENTTRACKDURATION;
static const char * CURRENTMEDIADURATION;
static const char * CURRENTTRACKMETADATA;
static const char * CURRENTTRACKURI;
static const char * AVTRANSPORTURI;
static const char * AVTRANSPORTURIMETADATA ;
static const char * NEXTAVTRANSPORTURI;
static const char * NEXTAVTRANSPORTURIMETADATA;
static const char * RELATIVETIMEPOSITION;
static const char * ABSOLUTETIMEPOSITION;
static const char * RELATIVECOUNTERPOSITION ;
static const char * ABSOLUTECOUNTERPOSITION ;
static const char * CURRENTTRANSPORTACTIONS;
static const char * LASTCHANGE;
static const char * SETAVTRANSPORTURI;
static const char * INSTANCEID;
static const char * CURRENTURI;
static const char * CURRENTURIMETADATA;
static const char * SETNEXTAVTRANSPORTURI;
static const char * NEXTURI;
static const char * NEXTURIMETADATA ;
static const char * GETMEDIAINFO;
static const char * NRTRACKS;
static const char * MEDIADURATION;
static const char * PLAYMEDIUM ;
static const char * RECORDMEDIUM ;
static const char * WRITESTATUS ;
static const char * GETTRANSPORTINFO ;
static const char * CURRENTTRANSPORTSTATE;
static const char * CURRENTTRANSPORTSTATUS ;
static const char * CURRENTSPEED ;
static const char * GETPOSITIONINFO;
static const char * TRACK;
static const char * TRACKDURATION;
static const char * TRACKMETADATA ;
static const char * TRACKURI ;
static const char * RELTIME;
static const char * ABSTIME;
static const char * RELCOUNT;
static const char * ABSCOUNT;
static const char * GETDEVICECAPABILITIES;
static const char * PLAYMEDIA ;
static const char * RECMEDIA ;
static const char * RECQUALITYMODES;
static const char * GETTRANSPORTSETTINGS;
static const char * PLAYMODE ;
static const char * RECQUALITYMODE ;
static const char * STOP;
static const char * PLAY;
static const char * SPEED ;
static const char * PAUSE;
static const char * RECORD ;
static const char * SEEK ;
static const char * UNIT;
static const char * TARGET ;
static const char * NEXT ;
static const char * PREVIOUS ;
static const char * SETPLAYMODE ;
static const char * NEWPLAYMODE ;
static const char * SETRECORDQUALITYMODE ;
static const char * NEWRECORDQUALITYMODE ;
static const char * GETCURRENTTRANSPORTACTIONS;
static const char * ACTIONS;
static const char * STOPPED ;
static const char * PLAYING ;
static const char * OK;
static const char * ERROR_OCCURRED ;
static const char * NORMAL ;
static const char * TRACK_NR ;
////////////////////////////////////////////////
// Constructor
////////////////////////////////////////////////
public:
AVT();
virtual ~AVT();
public:
void lock()
{
mutex.lock();
}
void unlock()
{
mutex.unlock();
}
////////////////////////////////////////////////
// ConnectionID
////////////////////////////////////////////////
////////////////////////////////////////////////
// ActionListener
////////////////////////////////////////////////
public:
bool actionControlReceived(Action *action);
public:
bool queryControlReceived(StateVariable *stateVar);
};
RenderingControl服务类
class RC : public ActionListener, public QueryListener
{
CyberUtil::Mutex mutex;
int maxConnectionID;
////////////////////////////////////////////////
// Constants
////////////////////////////////////////////////
public:
static const char *DESCRIPTION;
static const char *SERVICE_TYPE;
static const char *PRESETNAMELIST ;
static const char *LASTCHANGE ;
static const char *BRIGHTNESS;
static const char *CONTRAST ;
static const char *SHARPNESS ;
static const char *REDVIDEOGAIN;
static const char *GREENVIDEOGAIN ;
static const char *BLUEVIDEOGAIN ;
static const char *REDVIDEOBLACKLEVEL;
static const char *GREENVIDEOBLACKLEVEL ;
static const char *BLUEVIDEOBLACKLEVEL ;
static const char *COLORTEMPERATURE ;
static const char *HORIZONTALKEYSTONE ;
static const char *VERTICALKEYSTONE ;
static const char *MUTE ;
static const char *VOLUME ;
static const char *VOLUMEDB ;
static const char *LOUDNESS ;
static const char *LISTPRESETS;
static const char *INSTANCEID ;
static const char *CURRENTPRESETNAMELIST;
static const char *SELECTPRESET;
static const char *PRESETNAME;
static const char *GETBRIGHTNESS;
static const char *CURRENTBRIGHTNESS ;
static const char *SETBRIGHTNESS;
static const char *DESIREDBRIGHTNESS;
static const char *GETCONTRAST;
static const char *CURRENTCONTRAST;
static const char *SETCONTRAST;
static const char *DESIREDCONTRAST;
static const char *GETSHARPNESS;
static const char *CURRENTSHARPNESS;
static const char *SETSHARPNESS;
static const char *DESIREDSHARPNESS;
static const char *GETREDVIDEOGAIN;
static const char *CURRENTREDVIDEOGAIN;
static const char *SETREDVIDEOGAIN;
static const char *DESIREDREDVIDEOGAIN ;
static const char *GETGREENVIDEOGAIN;
static const char *CURRENTGREENVIDEOGAIN;
static const char *SETGREENVIDEOGAIN ;
static const char *DESIREDGREENVIDEOGAIN ;
static const char *GETBLUEVIDEOGAIN ;
static const char *CURRENTBLUEVIDEOGAIN ;
static const char *SETBLUEVIDEOGAIN;
static const char *DESIREDBLUEVIDEOGAIN ;
static const char *GETREDVIDEOBLACKLEVEL ;
static const char *CURRENTREDVIDEOBLACKLEVEL ;
static const char *SETREDVIDEOBLACKLEVEL;
static const char *DESIREDREDVIDEOBLACKLEVEL;
static const char *GETGREENVIDEOBLACKLEVEL;
static const char *CURRENTGREENVIDEOBLACKLEVEL;
static const char *SETGREENVIDEOBLACKLEVEL;
static const char *DESIREDGREENVIDEOBLACKLEVEL;
static const char *GETBLUEVIDEOBLACKLEVEL;
static const char *CURRENTBLUEVIDEOBLACKLEVEL;
static const char *SETBLUEVIDEOBLACKLEVEL;
static const char *DESIREDBLUEVIDEOBLACKLEVEL;
static const char *GETCOLORTEMPERATURE ;
static const char *CURRENTCOLORTEMPERATURE;
static const char *SETCOLORTEMPERATURE;
static const char *DESIREDCOLORTEMPERATURE;
static const char *GETHORIZONTALKEYSTONE;
static const char *CURRENTHORIZONTALKEYSTONE;
static const char *SETHORIZONTALKEYSTONE;
static const char *DESIREDHORIZONTALKEYSTONE;
static const char *GETVERTICALKEYSTONE;
static const char *CURRENTVERTICALKEYSTONE;
static const char *SETVERTICALKEYSTONE;
static const char *DESIREDVERTICALKEYSTONE;
static const char *GETMUTE ;
static const char *CHANNEL;
static const char *CURRENTMUTE ;
static const char *SETMUTE;
static const char *DESIREDMUTE;
static const char *GETVOLUME;
static const char *CURRENTVOLUME ;
static const char *SETVOLUME ;
static const char *DESIREDVOLUME ;
static const char *GETVOLUMEDB ;
static const char *SETVOLUMEDB;
static const char *GETVOLUMEDBRANGE ;
static const char *MINVALUE;
static const char *MAXVALUE;
static const char *GETLOUDNESS ;
static const char *CURRENTLOUDNESS;
static const char *SETLOUDNESS ;
static const char *DESIREDLOUDNESS;
static const char *MASTER ;
static const char *FACTORYDEFAULTS ;
public:
RC();
virtual ~RC();
public:
void lock()
{
mutex.lock();
}
void unlock()
{
mutex.unlock();
}
////////////////////////////////////////////////
// ConnectionID
////////////////////////////////////////////////
public:
bool actionControlReceived(Action *action);
public:
bool queryControlReceived(StateVariable *stateVar);
};
4）MediaRender的实现
MediaRender主要是实现ConnectionManager、AVTransport和RenderingControl服务
class MP : public Device
{
CM *conMan;
AVT *avTrans;
RC *renderCon;
////////////////////////////////////////////////
// Constants
////////////////////////////////////////////////
public:
static const char *DEVICE_TYPE;
static const int DEFAULT_HTTP_PORT;
static const char *DESCRIPTION;
////////////////////////////////////////////////
// Constructor
////////////////////////////////////////////////
public:
MP();
~MP();
////////////////////////////////////////////////
// setName
////////////////////////////////////////////////
public:
void setName(const char *name)
{
setFriendlyName(name);
}
const char *getName()
{
getFriendlyName();
}
////////////////////////////////////////////////
// Memeber
////////////////////////////////////////////////
public:
CM *getConnectionManager()
{
return conMan;
}
AVT *getAVTransport()
{
return avTrans;
}
RC *getRenderingControl()
{
return renderCon;
}
////////////////////////////////////////////////
// ContentDirectory
////////////////////////////////////////////////
public:
void setInterfaceAddress(const char *ifaddr)
{
CyberNet::SetHostInterface(ifaddr);
}
const char *getInterfaceAddress()
{
return CyberNet::GetHostInterface();
}
////////////////////////////////////////////////
// HttpRequestListner (Overridded)
////////////////////////////////////////////////
public:
void httpRequestRecieved(CyberHTTP::HTTPRequest *httpReq);
////////////////////////////////////////////////
// start/stop (Overided)
////////////////////////////////////////////////
public:
bool start()
{
Device::start();
return true;
}
bool stop()
{
Device::stop();
return true;
}
};
MP::MP() : Device()
{
// Device Configuration
loadDescription(MP::DESCRIPTION);
// Netwroking initialization
UPnP::SetEnable(UPnP::USE_ONLY_IPV4_ADDR);
string firstIf;
GetHostAddress(0, firstIf);
setInterfaceAddress(firstIf.c_str());
setHTTPPort(DEFAULT_HTTP_PORT);
// Servce Configuration
conMan = new CM();
Service *servConMan = getService(CM::SERVICE_TYPE);
servConMan->loadSCPD(CM::DESCRIPTION);
servConMan->setActionListener(getConnectionManager());
servConMan->setQueryListener(getConnectionManager());
avTrans= new AVT();
Service *servAvt = getService(AVT::SERVICE_TYPE);
servAvt->loadSCPD(AVT::DESCRIPTION);
servAvt->setActionListener(getAVTransport());
servAvt->setQueryListener(getAVTransport());
renderCon= new RC();
Service *servRC = getService(RC::SERVICE_TYPE);
servRC->loadSCPD(RC::DESCRIPTION);
servRC->setActionListener(getRenderingControl());
servRC->setQueryListener(getRenderingControl());
}
5） 启动MeidaRender
int main(int argc, char* argv[])
{
MP mplayer;
Debug::on();
PrintMessage();
//MediaPlayer mplayer;
mplayer.start();
/*
#if !defined(WIN32) || defined(__CYGWIN__)
kbinit();
#endif
*/
int ch;
do
{
#if defined(WIN32) && !defined(__CYGWIN__)
ch = getch();
#else
ch = getchar();
#endif
ch = toupper( ch );
//if (ch == 'P')
//PrintMediaServers(&mplayer);
} while( ch != 'Q');
/*#if !defined(WIN32) || defined(__CYGWIN__)
kbexit();
#endif
*/
mplayer.stop();
return 0;
}
6）性能对比测试
在Mstar的mips处理器上运行后，设备发现速度比JAVA版本cyberlink要快，通过Intel的测试工具(Intel AV Media Controller)能快速发现到设备