/*
 * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
 *
 * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
 *
 * Use of this source code is governed by MIT license that can be found in the
 * LICENSE file in the root of the source tree. All contributing project authors
 * may be found in the AUTHORS file in the root of the source tree.
 */

#ifndef H264Decoder_H_
#define H264Decoder_H_
#include <string>
#include <memory>
#include <stdexcept>
#ifdef __cplusplus
extern "C" {
#endif
//#include "libavutil/mathematics.h"
#include "libavcodec/avcodec.h"
//#include "libswscale/swscale.h"
#ifdef __cplusplus
}
#endif

using namespace std;

namespace mediakit {

class H264Decoder
{
public:
    H264Decoder(void){
        avcodec_register_all();
        AVCodec *pCodec = avcodec_find_decoder(AV_CODEC_ID_H264);
        if (!pCodec) {
            throw std::runtime_error("未找到H264解码器");
        }
        m_pContext.reset(avcodec_alloc_context3(pCodec), [](AVCodecContext *pCtx) {
            avcodec_close(pCtx);
            avcodec_free_context(&pCtx);
        });
        if (!m_pContext) {
            throw std::runtime_error("创建解码器失败");
        }
        if (pCodec->capabilities & AV_CODEC_CAP_TRUNCATED) {
            /* we do not send complete frames */
            m_pContext->flags |= AV_CODEC_FLAG_TRUNCATED;
        }
        if(avcodec_open2(m_pContext.get(), pCodec, NULL)< 0){
            throw std::runtime_error("打开编码器失败");
        }
        m_pFrame.reset(av_frame_alloc(),[](AVFrame *pFrame){
            av_frame_free(&pFrame);
        });
        if (!m_pFrame) {
            throw std::runtime_error("创建帧缓存失败");
        }
    }
    virtual ~H264Decoder(void){}
    bool inputVideo(unsigned char* data,unsigned int dataSize,uint32_t ui32Stamp,AVFrame **ppFrame){
        AVPacket pkt;
        av_init_packet(&pkt);
        pkt.data = data;
        pkt.size = dataSize;
        pkt.dts = ui32Stamp;
        int iGotPicture ;
        auto iLen = avcodec_decode_video2(m_pContext.get(), m_pFrame.get(), &iGotPicture, &pkt);
        if (!iGotPicture || iLen < 0) {
            return false;
        }
        *ppFrame = m_pFrame.get();
        return true;
    }
private:
    std::shared_ptr<AVCodecContext> m_pContext;
    std::shared_ptr<AVFrame> m_pFrame;
};


} /* namespace mediakit */

#endif /* H264Decoder_H_ */