#include "stream.hpp"

#include "../ffmpeg/data/CodedData.hpp"
#include "../ffmpeg/format/FormatIn.hpp"

namespace cffmpeg_wrap{
    stream::stream(ffwrapper::FormatIn *in, const int maxSize)
    :streamRef_(in)
    ,max_size_(maxSize)
    ,audio_(false)
    {}

    stream::~stream(){
        std::lock_guard<std::mutex> locker(mutex_avpkt_);
        list_avpkt_.clear();
    }

    int stream::SetPacket(std::shared_ptr<ffwrapper::CodedData> data){
        if (data){

            auto audio = streamRef_->isAudioPkt(data->getAVPacket());
            // 如果包是音频包,但是不使用音频,直接返回
            if (!audio_ && audio){
                return 0;
            }
            
            std::lock_guard<std::mutex> locker(mutex_avpkt_);
            list_avpkt_.push_back(data);
            
            while(list_avpkt_.size() > max_size_){
                list_avpkt_.pop_front();
                while(!list_avpkt_.empty()){
                    auto &cache = list_avpkt_.front();
                    AVPacket &avpkt = cache->getAVPacket();
                    if (!(avpkt.flags & AV_PKT_FLAG_KEY)){
                        list_avpkt_.pop_front();
                    }else{
                        break;
                    }
                }
            }
            return list_avpkt_.size();
        }
        return 0;
    }

    void stream::GetPacket(unsigned char **pktData, int *size, int *key){
        std::lock_guard<std::mutex> l(mutex_avpkt_);
        if(list_avpkt_.empty()){
            return;
        }
        auto data = list_avpkt_.front();
        auto pkt = data->getAVPacket();
        *key = pkt.flags & AV_PKT_FLAG_KEY;
        *size = pkt.size;
        *pktData = (unsigned char *)malloc(*size);
        memcpy(*pktData, pkt.data, pkt.size);

        list_avpkt_.pop_front();
    }
}