/*
 * H264Decoder.h
 *
 *  Created on: 2016年12月21日
 *      Author: xzl
 */

#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 ZL {
namespace Codec {

class H264Decoder
{
public:
	H264Decoder(void){
		avcodec_register_all();
		AVCodec *pCodec = avcodec_find_decoder(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 & CODEC_CAP_TRUNCATED) {
			/* we do not send complete frames */
			m_pContext->flags |= 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 Codec */
} /* namespace ZL */

#endif /* H264Decoder_H_ */