#include "decoder.hpp"

#include "ffmpeg/bridge/cvbridge.hpp"
#include "ffmpeg/format/FormatIn.hpp"
#include "ffmpeg/data/CodedData.hpp"
#include "ffmpeg/data/FrameData.hpp"
#include "ffmpeg/log/log.hpp"

extern "C"{
#include <libavformat/avformat.h>
#include <libavutil/opt.h>
#include <libswscale/swscale.h>
}

using namespace ffwrapper;
using namespace logif;

namespace cffmpeg_wrap
{
    decoder::decoder(ffwrapper::FormatIn *dec, const int w, const int h, const int f)
    :conv_(NULL)
    ,conv_w_(w)
    ,conv_h_(h)
    ,conv_flag_(f)
    ,decRef_(dec)
    {}
    
    decoder::~decoder(){
        if (conv_){
            delete conv_;
        }

        std::lock_guard<std::mutex> l(mutex_pic_);
        for(auto &i : list_pic_){
            free(i.data);
        }
        list_pic_.clear();
    }

    int decoder::initDecoder(){
        if (!decRef_) return -1;

        if(decRef_->getCodecContext() == NULL){
                
            bool flag = true;
            flag = decRef_->openCodec(AVMEDIA_TYPE_VIDEO, NULL);
            auto dec_ctx = decRef_->getCodecContext();
            if(conv_){
                delete conv_;
                conv_ = NULL;
            }
            conv_w_ = conv_w_ == 0 || conv_w_ > dec_ctx->width ? dec_ctx->width : conv_w_;
            conv_h_ = conv_h_ == 0 || conv_h_ > dec_ctx->height ? dec_ctx->height : conv_h_;
            AVPixelFormat pix_fmt = AV_PIX_FMT_BGR24;
            conv_ = new cvbridge(
                    dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
                    conv_w_, conv_h_, pix_fmt, conv_flag_);

            if (!flag){
                logIt("FormatIn openCodec Failed!");
                return -1;
            }
        }
        return 0;
    }

    int decoder::SetFrame(std::shared_ptr<ffwrapper::CodedData> data, int64_t &id){
        if (!data) return -1;
        
        if (!conv_){
            initDecoder();
        }
        auto frame(std::make_shared<FrameData>());
        auto ret = decRef_->decode(frame, data);
        if(ret == 1){
            //缓存数据
            BGR24 pic;
            AVFrame *frm = frame->getAVFrame();
            pic.w = conv_w_;
            pic.h = conv_h_;
            unsigned char *picData = (unsigned char*)malloc(pic.w * pic.h * 3);
            conv_->copyPicture(picData, frm);
            pic.data = picData;
            pic.id = id;

            std::lock_guard<std::mutex> l(mutex_pic_);
            while(list_pic_.size() > 10){
                for(int i = 0; i < 5; i++){
                    auto t = list_pic_.front();
                    free(t.data);
                    list_pic_.pop_front();
                }
            }
            list_pic_.emplace_back(pic);

        }
        return list_pic_.size();
    }

    void decoder::GetFrame(unsigned char **data, int *w, int *h, int64_t *id){
        std::lock_guard<std::mutex> l(mutex_pic_);
        if(list_pic_.empty()){
            *data = NULL;
            *w = 0;
            *h = 0;
            return;
        }
        auto p = list_pic_.front();
        *data = p.data; *w = p.w; *h = p.h;
        *id = p.id;
        list_pic_.pop_front();
    }

} // namespace cffmpeg_wrap