class BLASTBufferQueue : public ConsumerBase::FrameAvailableListener {
private:
    void createBufferQueue(sp<IGraphicBufferProducer>* outProducer,
                           sp<IGraphicBufferConsumer>* outConsumer);

    std::string mName;
    // Keep a reference to the submitted buffers so we can release when surfaceflinger drops the
    // buffer or the buffer has been presented and a new buffer is ready to be presented.
    std::unordered_map<ReleaseCallbackId, BufferItem, ReleaseBufferCallbackIdHash> mSubmitted
            GUARDED_BY(mMutex);
    std::deque<ReleasedBuffer> mPendingRelease GUARDED_BY(mMutex);
    sp<IGraphicBufferConsumer> mConsumer;
    sp<IGraphicBufferProducer> mProducer;
    sp<BLASTBufferItemConsumer> mBufferItemConsumer;

BLASTBufferQueue 有成员 mConsumer 和 mProducer，在 createBufferQueue() 中创建 BufferQueueCore，所以说 BLASTBufferQueue 是一个 BufferQueue。它是在应用内部循环的 BufferQueue。

BBQSurface 通过 mProducer 的 BufferQueueProducer::dequeueBuffer() 申请 buffer。当 BufferQueueProducer::queueBuffer() 时，会回调 onFrameAvailable()，因为 BLASTBufferQueue 继承了 ConsumerBase::FrameAvailableListener。