接上篇博文 NDK下 将Platinum SDK 编译成so库 （android - upnp）

讲述了如何利用该代码库编译给android程序调用的so库，其中也提到了，在使用sample-upnp工程来测试生成的so库是无效的

大家比对一下Platinum开发库的Platinum\Source\Platform\Android\module\platinum\jni\platinum-jni.cpp和

Platinum\Source\Tests\MediaRenderer\MediaRendererTest.cpp

platinum-jni.cpp

#include <assert.h>
#include <jni.h>
#include <string.h>
#include <sys/types.h>#include "platinum-jni.h"
#include "Platinum.h"#include <android/log.h>/*----------------------------------------------------------------------
|   logging
+---------------------------------------------------------------------*/
NPT_SET_LOCAL_LOGGER("platinum.android.jni")/*----------------------------------------------------------------------
|   functions
+---------------------------------------------------------------------*/
__attribute__((constructor)) static void onDlOpen(void)
{
}/*----------------------------------------------------------------------
|    JNI_OnLoad
+---------------------------------------------------------------------*/
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved)
{NPT_LogManager::GetDefault().Configure("plist:.level=FINE;.handlers=ConsoleHandler;.ConsoleHandler.outputs=2;.ConsoleHandler.colors=false;.ConsoleHandler.filter=59");return JNI_VERSION_1_4;
}/** Class:     com_plutinosoft_platinum_UPnP* Method:    _init* Signature: ()J*/
JNIEXPORT jlong JNICALL Java_com_plutinosoft_platinum_UPnP__1init(JNIEnv *env, jclass)
{NPT_LOG_INFO("init");PLT_UPnP* self = new PLT_UPnP();return (jlong)self;
}/** Class:     com_plutinosoft_platinum_UPnP* Method:    _start* Signature: (J)I*/
JNIEXPORT jint JNICALL Java_com_plutinosoft_platinum_UPnP__1start(JNIEnv *, jclass, jlong _self)
{NPT_LOG_INFO("start");PLT_UPnP* self = (PLT_UPnP*)_self;return self->Start();
}/** Class:     com_plutinosoft_platinum_UPnP* Method:    _stop* Signature: (J)I*/
JNIEXPORT jint JNICALL Java_com_plutinosoft_platinum_UPnP__1stop(JNIEnv *, jclass, jlong _self)
{NPT_LOG_INFO("stop");PLT_UPnP* self = (PLT_UPnP*)_self;return self->Stop();
}

MediaRendererTest.cpp

#include "PltUPnP.h"
#include "PltMediaRenderer.h"#include <stdlib.h>/*----------------------------------------------------------------------
|   globals
+---------------------------------------------------------------------*/
struct Options {const char* friendly_name;
} Options;/*----------------------------------------------------------------------
|   PrintUsageAndExit
+---------------------------------------------------------------------*/
static void
PrintUsageAndExit(char** args)
{fprintf(stderr, "usage: %s [-f <friendly_name>]\n", args[0]);fprintf(stderr, "-f : optional upnp server friendly name\n");fprintf(stderr, "<path> : local path to serve\n");exit(1);
}/*----------------------------------------------------------------------
|   ParseCommandLine
+---------------------------------------------------------------------*/
static void
ParseCommandLine(char** args)
{const char* arg;char**      tmp = args+1;/* default values */Options.friendly_name = NULL;while ((arg = *tmp++)) {if (!strcmp(arg, "-f")) {Options.friendly_name = *tmp++;} else {fprintf(stderr, "ERROR: too many arguments\n");PrintUsageAndExit(args);}}
}/*----------------------------------------------------------------------
|   main
+---------------------------------------------------------------------*/
int
main(int /* argc */, char** argv)
{   PLT_UPnP upnp;/* parse command line */ParseCommandLine(argv);PLT_DeviceHostReference device(new PLT_MediaRenderer(Options.friendly_name?Options.friendly_name:"Platinum Media Renderer",false,"e6572b54-f3c7-2d91-2fb5-b757f2537e21"));upnp.AddDevice(device);bool added = true;upnp.Start();char buf[256];while (gets(buf)) {if (*buf == 'q')break;if (*buf == 's') {if (added) {upnp.RemoveDevice(device);} else {upnp.AddDevice(device);}added = !added;}}upnp.Stop();return 0;
}

可以看出JNI接口中的PLT_UPnP对象并没有加入PLT_DeviceHostReference对象，所以无法启动设备，只要参照MediaRenderTest.cpp的做法我们就可以实现一个dmr设备的开启与关闭了，童鞋们可以仿照博文 基于Platinum库的DMR实现（android）当中的jni类来尝试实现一下这两个接口

public static native int startMediaRender(byte[] friendname ,byte[] uuid);

public static native int stopMediaRender();

完成这一步，DMR的实现就已经成功一半了

接下来我们要做的两件事就是

1.将外部的action事件通过反射机制抛给java层处理

2.通过jni将一些事件状态值更新至所在服务列表

先看第一点，每当有action事件到来时，PLT_MediaRenderer的

virtual NPT_Result OnAction(PLT_ActionReference&action,const PLT_HttpRequestContext& context);方法就会被调用

NPT_Result
PLT_MediaRenderer::OnAction(PLT_ActionReference&          action, const PLT_HttpRequestContext& context)
{NPT_COMPILER_UNUSED(context);/* parse the action name */NPT_String name = action->GetActionDesc().GetName();// since all actions take an instance ID and we only support 1 instance// verify that the Instance ID is 0 and return an error here now if notNPT_String serviceType = action->GetActionDesc().GetService()->GetServiceType();if (serviceType.Compare("urn:schemas-upnp-org:service:AVTransport:1", true) == 0) {if (NPT_FAILED(action->VerifyArgumentValue("InstanceID", "0"))) {action->SetError(718, "Not valid InstanceID");return NPT_FAILURE;}}serviceType = action->GetActionDesc().GetService()->GetServiceType();if (serviceType.Compare("urn:schemas-upnp-org:service:RenderingControl:1", true) == 0) {if (NPT_FAILED(action->VerifyArgumentValue("InstanceID", "0"))) {action->SetError(702, "Not valid InstanceID");return NPT_FAILURE;}}/* Is it a ConnectionManager Service Action ? */if (name.Compare("GetCurrentConnectionInfo", true) == 0) {return OnGetCurrentConnectionInfo(action);}  /* Is it a AVTransport Service Action ? */if (name.Compare("Next", true) == 0) {return OnNext(action);}if (name.Compare("Pause", true) == 0) {return OnPause(action);}if (name.Compare("Play", true) == 0) {return OnPlay(action);}if (name.Compare("Previous", true) == 0) {return OnPrevious(action);}if (name.Compare("Seek", true) == 0) {return OnSeek(action);}if (name.Compare("Stop", true) == 0) {return OnStop(action);}if (name.Compare("SetAVTransportURI", true) == 0) {return OnSetAVTransportURI(action);}if (name.Compare("SetPlayMode", true) == 0) {return OnSetPlayMode(action);}/* Is it a RendererControl Service Action ? */if (name.Compare("SetVolume", true) == 0) {return OnSetVolume(action);}if (name.Compare("SetVolumeDB", true) == 0) {return OnSetVolumeDB(action);}if (name.Compare("GetVolumeDBRange", true) == 0) {return OnGetVolumeDBRange(action);}if (name.Compare("SetMute", true) == 0) {return OnSetMute(action);}// other actions rely on state variablesNPT_CHECK_LABEL_WARNING(action->SetArgumentsOutFromStateVariable(), failure);return NPT_SUCCESS;failure:action->SetError(401,"No Such Action.");return NPT_FAILURE;
}

部分事件会由m_Delegate成员变量来处理，也就是 virtual void SetDelegate(PLT_MediaRendererDelegate* delegate) { m_Delegate = delegate; }传进来的

所以我们只需要从PLT_MediaRendererDelegate类派生一个子类，然后将它设进PLT_MediaRenderer并实现相应的action方法并把一些需要的值反射出来即可

class PLT_MediaRendererDelegate
{
public:virtual ~PLT_MediaRendererDelegate() {}// ConnectionManagervirtual NPT_Result OnGetCurrentConnectionInfo(PLT_ActionReference& action) = 0;// AVTransportvirtual NPT_Result OnNext(PLT_ActionReference& action) = 0;virtual NPT_Result OnPause(PLT_ActionReference& action) = 0;virtual NPT_Result OnPlay(PLT_ActionReference& action) = 0;virtual NPT_Result OnPrevious(PLT_ActionReference& action) = 0;virtual NPT_Result OnSeek(PLT_ActionReference& action) = 0;virtual NPT_Result OnStop(PLT_ActionReference& action) = 0;virtual NPT_Result OnSetAVTransportURI(PLT_ActionReference& action) = 0;virtual NPT_Result OnSetPlayMode(PLT_ActionReference& action) = 0;// RenderingControlvirtual NPT_Result OnSetVolume(PLT_ActionReference& action) = 0;virtual NPT_Result OnSetVolumeDB(PLT_ActionReference& action) = 0;virtual NPT_Result OnGetVolumeDBRange(PLT_ActionReference& action) = 0;virtual NPT_Result OnSetMute(PLT_ActionReference& action) = 0;
};

void ActionInflect(int cmd, const char* value, const char* data)
{if (g_vm == NULL){UpnpPrintInfo("g_vm = NULL!!!");return ;}int status;JNIEnv *env = NULL;bool isAttach = false;status = g_vm->GetEnv((void **) &env, JNI_VERSION_1_6);if(status != JNI_OK) {status = g_vm->AttachCurrentThread(&env, NULL);if(status < 0) {UpnpPrintInfo("callback_handler: failed to attach , current thread, status = %d", status);return;}isAttach = true;}jstring valueString = NULL;jstring dataString = NULL;jclass inflectClass = g_inflectClass;jmethodID inflectMethod = g_methodID;if (inflectClass == NULL || inflectMethod == NULL){goto end;}//    UpnpPrintInfo("CMD = %d\nVALUE = %s\nDATA = %s",cmd, value, data);valueString = env->NewStringUTF(value);dataString = env->NewStringUTF(data);env->CallStaticVoidMethod(inflectClass, inflectMethod, cmd, valueString, dataString);env->DeleteLocalRef(valueString);env->DeleteLocalRef(dataString);end:if (env->ExceptionOccurred()){env->ExceptionDescribe();env->ExceptionClear();}if (isAttach){g_vm->DetachCurrentThread();}}

再看第二点，如何将事件变量值更新至服务列表

首先通过FindServiceByType方法找到urn:schemas-upnp-org:service:AVTransport:1服务，

然后通过SetStateVariable更新值即可

变量名与值对应关系大家参照dlna文档开发即可

http://download.csdn.net/detail/geniuseoe2012/4969961

重点看standardizeddcps\MediaServer_4 and  MediaRenderer_3下的UPnP-av-AVTransport-v3-Service-20101231.pdf文档

代码实现可以参照PLT_MediaRenderer::SetupServices()方法

NPT_Result
PLT_MediaRenderer::SetupServices()
{PLT_Service* service;{/* AVTransport */service = new PLT_Service(this,"urn:schemas-upnp-org:service:AVTransport:1", "urn:upnp-org:serviceId:AVTransport","AVTransport","urn:schemas-upnp-org:metadata-1-0/AVT/");NPT_CHECK_FATAL(service->SetSCPDXML((const char*) RDR_AVTransportSCPD));NPT_CHECK_FATAL(AddService(service));service->SetStateVariableRate("LastChange", NPT_TimeInterval(0.2f));service->SetStateVariable("A_ARG_TYPE_InstanceID", "0"); // GetCurrentTransportActionsservice->SetStateVariable("CurrentTransportActions", "Play,Pause,Stop,Seek,Next,Previous");// GetDeviceCapabilitiesservice->SetStateVariable("PossiblePlaybackStorageMedia", "NONE,NETWORK,HDD,CD-DA,UNKNOWN");service->SetStateVariable("PossibleRecordStorageMedia", "NOT_IMPLEMENTED");service->SetStateVariable("PossibleRecordQualityModes", "NOT_IMPLEMENTED");// GetMediaInfoservice->SetStateVariable("NumberOfTracks", "0");service->SetStateVariable("CurrentMediaDuration", "00:00:00");service->SetStateVariable("AVTransportURI", "");service->SetStateVariable("AVTransportURIMetadata", "");;service->SetStateVariable("NextAVTransportURI", "NOT_IMPLEMENTED");service->SetStateVariable("NextAVTransportURIMetadata", "NOT_IMPLEMENTED");service->SetStateVariable("PlaybackStorageMedium", "NONE");service->SetStateVariable("RecordStorageMedium", "NOT_IMPLEMENTED");service->SetStateVariable("RecordMediumWriteStatus", "NOT_IMPLEMENTED");// GetPositionInfoservice->SetStateVariable("CurrentTrack", "0");NPT_Result durResult = service->SetStateVariable("CurrentTrackDuration", "00:00:00");service->SetStateVariable("CurrentTrackMetadata", "");service->SetStateVariable("CurrentTrackURI", "");NPT_Result relTimeResult = service->SetStateVariable("RelativeTimePosition", "00:00:00"); service->SetStateVariable("AbsoluteTimePosition", "00:50:00");service->SetStateVariable("RelativeCounterPosition", "2147483647"); // means NOT_IMPLEMENTEDservice->SetStateVariable("AbsoluteCounterPosition", "2147483647"); // means NOT_IMPLEMENTED// disable indirect eventing for certain state variablesPLT_StateVariable* var;var = service->FindStateVariable("RelativeTimePosition");if (var) var->DisableIndirectEventing();var = service->FindStateVariable("AbsoluteTimePosition");if (var) var->DisableIndirectEventing();var = service->FindStateVariable("RelativeCounterPosition");if (var) var->DisableIndirectEventing();var = service->FindStateVariable("AbsoluteCounterPosition");if (var) var->DisableIndirectEventing();// GetTransportInfoservice->SetStateVariable("TransportState", "NO_MEDIA_PRESENT");service->SetStateVariable("TransportStatus", "OK");service->SetStateVariable("TransportPlaySpeed", "1");// GetTransportSettingsservice->SetStateVariable("CurrentPlayMode", "NORMAL");service->SetStateVariable("CurrentRecordQualityMode", "NOT_IMPLEMENTED");}{/* ConnectionManager */service = new PLT_Service(this,"urn:schemas-upnp-org:service:ConnectionManager:1", "urn:upnp-org:serviceId:ConnectionManager","ConnectionManager");NPT_CHECK_FATAL(service->SetSCPDXML((const char*) RDR_ConnectionManagerSCPD));NPT_CHECK_FATAL(AddService(service));service->SetStateVariable("CurrentConnectionIDs", "0");// put all supported mime types here insteadservice->SetStateVariable("SinkProtocolInfo", "http-get:*:video/x-ms-wmv:DLNA.ORG_PN=WMVMED_PRO,http-get:*:video/x-ms-asf:DLNA.ORG_PN=MPEG4_P2_ASF_SP_G726,http-get:*:video/x-ms-wmv:DLNA.ORG_PN=WMVMED_FULL,http-get:*:image/jpeg:DLNA.ORG_PN=JPEG_MED,http-get:*:video/x-ms-wmv:DLNA.ORG_PN=WMVMED_BASE,http-get:*:audio/L16;rate=44100;channels=1:DLNA.ORG_PN=LPCM,http-get:*:video/mpeg:DLNA.ORG_PN=MPEG_PS_PAL,http-get:*:video/mpeg:DLNA.ORG_PN=MPEG_PS_NTSC,http-get:*:video/x-ms-wmv:DLNA.ORG_PN=WMVHIGH_PRO,http-get:*:audio/L16;rate=44100;channels=2:DLNA.ORG_PN=LPCM,http-get:*:image/jpeg:DLNA.ORG_PN=JPEG_SM,http-get:*:video/x-ms-asf:DLNA.ORG_PN=VC1_ASF_AP_L1_WMA,http-get:*:audio/x-ms-wma:DLNA.ORG_PN=WMDRM_WMABASE,http-get:*:video/x-ms-wmv:DLNA.ORG_PN=WMVHIGH_FULL,http-get:*:audio/x-ms-wma:DLNA.ORG_PN=WMAFULL,http-get:*:audio/x-ms-wma:DLNA.ORG_PN=WMABASE,http-get:*:video/x-ms-wmv:DLNA.ORG_PN=WMVSPLL_BASE,http-get:*:video/mpeg:DLNA.ORG_PN=MPEG_PS_NTSC_XAC3,http-get:*:video/x-ms-wmv:DLNA.ORG_PN=WMDRM_WMVSPLL_BASE,http-get:*:video/x-ms-wmv:DLNA.ORG_PN=WMVSPML_BASE,http-get:*:video/x-ms-asf:DLNA.ORG_PN=MPEG4_P2_ASF_ASP_L5_SO_G726,http-get:*:image/jpeg:DLNA.ORG_PN=JPEG_LRG,http-get:*:audio/mpeg:DLNA.ORG_PN=MP3,http-get:*:video/mpeg:DLNA.ORG_PN=MPEG_PS_PAL_XAC3,http-get:*:audio/x-ms-wma:DLNA.ORG_PN=WMAPRO,http-get:*:video/mpeg:DLNA.ORG_PN=MPEG1,http-get:*:image/jpeg:DLNA.ORG_PN=JPEG_TN,http-get:*:video/x-ms-asf:DLNA.ORG_PN=MPEG4_P2_ASF_ASP_L4_SO_G726,http-get:*:audio/L16;rate=48000;channels=2:DLNA.ORG_PN=LPCM,http-get:*:audio/mpeg:DLNA.ORG_PN=MP3X,http-get:*:video/x-ms-wmv:DLNA.ORG_PN=WMVSPML_MP3,http-get:*:video/x-ms-wmv:*,http-get:*:video/mp4:*");service->SetStateVariable("SourceProtocolInfo", "");}{/* RenderingControl */service = new PLT_Service(this,"urn:schemas-upnp-org:service:RenderingControl:1", "urn:upnp-org:serviceId:RenderingControl","RenderingControl","urn:schemas-upnp-org:metadata-1-0/RCS/");NPT_CHECK_FATAL(service->SetSCPDXML((const char*) RDR_RenderingControlSCPD));NPT_CHECK_FATAL(AddService(service));service->SetStateVariableRate("LastChange", NPT_TimeInterval(0.2f));service->SetStateVariable("Mute", "0");service->SetStateVariableExtraAttribute("Mute", "Channel", "Master");service->SetStateVariable("Volume", "100");service->SetStateVariableExtraAttribute("Volume", "Channel", "Master");service->SetStateVariable("VolumeDB", "0");service->SetStateVariableExtraAttribute("VolumeDB", "Channel", "Master");service->SetStateVariable("PresetNameList", "FactoryDefaults");}return NPT_SUCCESS;
}

至此代码实现步骤已全部讲解完毕，当然在具体实现过程中多多少少会遇到些问题

根据log信息多问问谷哥度娘，一般都能找到解决方案的

同时在jni层转换C++类型与java类型时一定要注意及时释放资源，不要造成内存泄漏了

另外不要再向楼主索要源码了，编程最重要的是思维

只有自己动手实践了，摸索了，思考了，解决了，自身水平才会提高

否则你永远都只能是code-farmer而无法成为code-designer

授之以鱼不如授之予渔也是蓝老师一贯的教学宗旨，伸手党请自觉绕道

最后感谢大家的支持，我们下节课再见！

more brilliant，Please pay attention to my CSDN blog -->http://blog.csdn.net/geniuseoe2012