Method pull

framework/filter/VideoFilterChain.cpp:147–161

}

int VideoFilterChain::pull(std::unique_ptr<IAFFrame> &frame)
{
    IAFFrame *framePtr = nullptr;
    if (!mOutPutFrames.empty()) {
        framePtr = mOutPutFrames.front();
        mOutPutFrames.pop();
    }

    if (framePtr == nullptr) {
        return -1;
    }

    frame.reset(framePtr);
    return 0;
}

bool VideoFilterChain::empty()
{