一文搞懂Codec2框架解析

codec2
|--components  #具體編解碼組件與組件接口層
|	|--base/SimpleC2Component.cpp
|	|--base/SimpleC2Interface.cpp
|	|--avc/C2SoftAvcDec.cpp	
|--core        #存在核心的頭文件，譬如Buffer定義、Component定義、Config定義、Param定義
|--docs        #暫時存放doxygen配置文件與腳本
|--faultinjection
|--hidl        #與hidl調用相關的實現
	|--client/client.cpp
	|--1.0/utils/Component.cpp
	|--1.0/utils/ComponentInterface.cpp
	|--1.0/utils/ComponentStore.cpp
	|--1.0/utils/Configurable.cpp
	|--1.0/utils/include/codec2/hidl/1.0/Component.h
	|--1.0/utils/include/codec2/hidl/1.0/Configurable.h
	|--1.0/utils/include/codec2/hidl/1.0/ComponentInterface.h
|--sfplugin    #頂層接口與實現層
|	|--CCodec.cpp
|	|--CCodec.h
|	|--CBufferChannel.cpp
|	|--CBufferChannel.h
|--tests
|--vndk        #基礎的util實現
|	|--C2Store.cpp

virtual std::shared_ptr<BufferChannelBase> getBufferChannel() override;
virtual void initiateAllocateComponent(const sp<AMessage> &msg) override;
virtual void initiateConfigureComponent(const sp<AMessage> &msg) override;
virtual void initiateCreateInputSurface() override;
virtual void initiateSetInputSurface(const sp<PersistentSurface> &surface) override;
virtual void initiateStart() override;
virtual void initiateShutdown(bool keepComponentAllocated = false) override;
virtual status_t setSurface(const sp<Surface> &surface) override;

virtual void signalFlush() override; virtual void signalResume() override;
virtual void signalSetParameters(const sp<AMessage> &params) override;
virtual void signalEndOfInputStream() override;
virtual void signalRequestIDRFrame() override;

void onWorkDone(std::list<std::unique_ptr<C2Work>> &workItems);
void onInputBufferDone(uint64_t frameIndex, size_t arrayIndex);

//client.cpp
	virtual Return<void> onInputBuffersReleased(
            const hidl_vec<InputBuffer>& inputBuffers) override {
        std::shared_ptr<Listener> listener = base.lock();
        if (!listener) {
            LOG(DEBUG) << "onInputBuffersReleased -- listener died.";
            return Void();
        }
        for (const InputBuffer& inputBuffer : inputBuffers) {
            LOG(VERBOSE) << "onInputBuffersReleased --"
                            " received death notification of"
                            " input buffer:"
                            " frameIndex = " << inputBuffer.frameIndex
                         << ", bufferIndex = " << inputBuffer.arrayIndex
                         << ".";
            listener->onInputBufferDone(
                    inputBuffer.frameIndex, inputBuffer.arrayIndex);
        }
        return Void();
    }

 * InputBufferManager holds a collection of records representing tracked buffers
 * and their callback listeners. Conceptually, one record is a triple (listener,
 * frameIndex, bufferIndex) where
 *
 * - (frameIndex, bufferIndex) is a pair of indices used to identify the buffer.
 * - listener is of type IComponentListener. Its onInputBuffersReleased()
 *   function will be called after the associated buffer dies. The argument of
 *   onInputBuffersReleased() is a list of InputBuffer objects, each of which
 *   has the following members:
 *
 *     uint64_t frameIndex
 *     uint32_t arrayIndex
 *
 * When a tracked buffer associated to the triple (listener, frameIndex,
 * bufferIndex) goes out of scope, listener->onInputBuffersReleased() will be
 * called with an InputBuffer object whose members are set as follows:
 *
 *     inputBuffer.frameIndex = frameIndex
 *     inputBuffer.arrayIndex = bufferIndex