Android OMXNodeinstance/OMX Component交互

OMXNodeInstance.cpp:

OMX_CALLBACKTYPE OMXNodeInstance::kCallbacks = {

    &OnEvent, &OnEmptyBufferDone, &OnFillBufferDone

};

OMX.cpp

status_t OMX:allocateNode

...

OMX_ERRORTYPE err = mMaster->makeComponentInstance(name, &OMXNodeInstance::kCallbacks, instance, &handle);

在创建omx component的时候带入kCallbacks,供omx component notify.

当omx component有消息通知的时候，会首先调到OMXNodeInstance.cpp里面的

void OMXNodeInstance::onEvent()

OMX_ERRORTYPE OMXNodeInstance::OnEmptyBufferDone()/OnFillBufferDone()

OMXNodeInstance会再通过instance->owner调到OMX.cpp里面的

OMX_ERRORTYPE OMX::OnEvent()

OMX_ERRORTYPE OMX::OnEmptyBufferDone()/OnFillBufferDone

OMX会再通过dispatcher->post/loop/dispatch再回到OMXNodeInstance.cpp里面的onMessage()

OMXNodeInstance会再通过mObserver->onMessage()回到ACodec中