视频流AVPacket指针队列处理

队列实现

//-------------------for video avpacket queue---------------------------------
struct QueueData{
    AVPacket *pkt{nullptr};
    QueueData *next{nullptr};
};

struct MyVideoQueue{
    QueueData *front;
    QueueData *end;
    MyVideoQueue(){
        front=end=NULL;
    }

    bool Empty(){return front==NULL;}
    void EnQueue(AVPacket* _pkt){
        if(nullptr == _pkt){
            return;
        }

        AVPacket *p=nullptr;
        p=av_packet_alloc();
        p=av_packet_clone(_pkt);

        //qDebug()<<"===>入队: copy _pkt to new AVPacket* : "<<p;
        QueueData *d = new QueueData;
        d->pkt=p;
        d->next=nullptr;
        qDebug()<<"===>入队: "<<d->pkt;
        if (Empty()) {
            f