M之前版本在一个进程中创建media相关所有服务
av/media/mediaserver/main_mediaserver.cpp
sp<IServiceManager> sm = defaultServiceManager();
ALOGI("ServiceManager: %p", sm.get());
AudioFlinger::instantiate();
MediaPlayerService::instantiate();
ResourceManagerService::instantiate();
CameraService::instantiate();
AudioPolicyService::instantiate();
SoundTriggerHwService::instantiate();
RadioService::instantiate();
registerExtensions();
ProcessState::self()->startThreadPool();
IPCThreadState::self()->joinThreadPool();
N版本将各个服务转移到不同进程中进行创建
media/audioserver/main_audioserver.cpp: AudioPolicyService::instantiate();
camera/cameraserver/main_cameraserver.cpp: CameraService::instantiate();
media/mediaserver/main_mediaserver.cpp: MediaPlayerService::instantiate();
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