FFmpeg中结构释放小函数

用于FFmpeg一些结构内存释放问题

#pragma once
#include <iostream>extern "C"
{
#include "libavformat/avformat.h"
#include "libavcodec/avcodec.h"
#include "libavutil/avutil.h"
#include "libavutil/frame.h"
#include "libavcodec/packet.h"
}// 泛化变参模板 ///
template <typename T, typename... Args>
void CleanUp(T* para, Args&&... args)
{CleanUp(para);	CleanUp(std::forward<Args>(args)...);
}特化模板 /
template<>
inline void CleanUp<AVFormatContext*>(AVFormatContext** pp_fmt_ctx) {	if (pp_fmt_ctx && *pp_fmt_ctx) {avformat_close_input(pp_fmt_ctx);pp_fmt_ctx = nullptr;}
}template<>
inline void CleanUp<AVCodecContext*>(AVCodecContext** pp_codec_cxt) {if (pp_codec_cxt && *pp_codec_cxt) {avcodec_free_context(pp_codec_cxt);pp_codec_cxt = nullptr;}
}template<>
inline void CleanUp<AVPacket*>(AVPacket** pp_pkt) {if (pp_pkt && *pp_pkt) {av_packet_free(pp_pkt);pp_pkt = nullptr;}
}template<>
inline void CleanUp<AVFrame*>(AVFrame** pp_frame) {if (pp_frame && *pp_frame) {av_frame_free(pp_frame);pp_frame = nullptr;}
}template<>
inline void CleanUp<uint8_t*>(uint8_t** u8_buffer) {if (u8_buffer && *u8_buffer) {av_freep(*u8_buffer);u8_buffer = nullptr;}
}template<>
inline void CleanUp<FILE*>(FILE** pp_fp) {if (pp_fp && *pp_fp) {fclose(*pp_fp);pp_fp = nullptr;}
}

测试文件

// 资源释放测试
#include "CDestroyRes.h"
#include "vld.h"
#include <iostream>extern "C"
{
#include <libavutil/avutil.h>
}
#pragma comment(lib, "avutil.lib")
#pragma comment(lib, "vld.lib")int main()
{int n = 100;while (--n){AVFormatContext* fmt_ctx = avformat_alloc_context();const AVCodec* codec = avcodec_find_encoder(AV_CODEC_ID_H264);AVCodecContext* encoder = avcodec_alloc_context3(codec);AVPacket* pkt = av_packet_alloc();AVFrame* frame = av_frame_alloc();frame->width = 1280;frame->height = 640;frame->format = AV_PIX_FMT_ARGB;av_frame_get_buffer(frame, 0);CleanUp(&fmt_ctx, &encoder, &pkt, &frame);}getchar();return 0;
}