#ifndef PCH_H
#define PCH_H
extern "C"
{
    #include "libavutil/opt.h"
    #include "libavutil/channel_layout.h"
    #include "libavutil/common.h"
    #include "libavutil/imgutils.h"
    #include "libavutil/mathematics.h"
    #include "libavutil/samplefmt.h"
    #include "libavutil/time.h"
    #include "libavutil/fifo.h"
    #include "libavcodec/avcodec.h"
    #include "libavformat/avformat.h"
    #include "libavformat/avio.h"
//    #include "libavfilter/avfiltergraph.h"
    #include "libavfilter/avfilter.h"
    #include "libavfilter/buffersink.h"
    #include "libavfilter/buffersrc.h"
    #include "libswscale/swscale.h"
    #include "libswresample/swresample.h"
}
#endif

pch.h

// CGaveFile.cpp : 定义控制台应用程序的入口点。
//
/* Copyright [c] 2018-2028 By www.chungen90.com Allrights Reserved 
This file give a simple example of how to get stream from
buffer. Any questions, you can join QQ group for help, QQ
Group number:127903734 or 766718184.
*/
//#include "stdafx.h"
#include "pch.h"
#include <string>
#include <memory>
#include <thread>
#include <iostream>
#include <WinSock2.h>
using namespace std;
#pragma comment(lib, "Ws2_32.lib")


class UdpSocket
{
public:
    UdpSocket()
    {

    }
public:
    SOCKET RecvSocket;
};


AVFormatContext *inputContext = nullptr;
AVFormatContext * outputContext;
int64_t lastReadPacktTime ;
UdpSocket udpSocket;


static int interrupt_cb(void *ctx)
{
    int  timeout  = 10;
    if(av_gettime() - lastReadPacktTime > timeout *1000 *1000)
    {
        return -1;
    }
    return 0;
}

static int readUdpSocket(void *opaque, uint8_t *buf, int buf_size)
{
    UdpSocket *udpSocket = (UdpSocket *)opaque;
    char cRecvBuff[2000];                               //定义接收缓冲区
    SOCKADDR_IN sin,saClient;
    int nSize = sizeof(saClient);
    int  readSize = buf_size < sizeof(cRecvBuff) ? buf_size :sizeof(cRecvBuff);              

    auto iResult = recvfrom(udpSocket->RecvSocket,
        (char *)cRecvBuff, readSize, 0, (SOCKADDR *) & saClient, &nSize);
    if (iResult == SOCKET_ERROR) {
        wprintf(L"recvfrom failed with error %d\n", WSAGetLastError());
        iResult = 0;
    }
    else 
    {
        if( iResult > 0)
        {
            memcpy(buf,cRecvBuff ,iResult );
        }
    }

    if( iResult > 0)
    {
        return iResult;
    }
    return iResult;

}
int OpenInput()
{    
    lastReadPacktTime = av_gettime();
    int size = 32 * 1024;
    uint8_t * iobuffer = (uint8_t *)av_malloc(size);
    AVIOContext *avio = avio_alloc_context(iobuffer, size, 0, &udpSocket, readUdpSocket, NULL, NULL);
    inputContext = avformat_alloc_context();
    inputContext->pb = avio;
    inputContext->start_time_realtime = av_gettime();

    int ret = avformat_open_input(&inputContext, nullptr, nullptr, nullptr);
    if(ret < 0)
    {
        av_log(NULL, AV_LOG_ERROR, "Input file open input failed\n");
        return  ret;
    }
    ret = avformat_find_stream_info(inputContext,nullptr);
    if(ret < 0)
    {
        av_log(NULL, AV_LOG_ERROR, "Find input file stream inform failed\n");
    }
    else
    {
        av_log(NULL, AV_LOG_FATAL, "Open input file success\n");
    }
    return ret;
}

shared_ptr<AVPacket> ReadPacketFromSource()
{
    shared_ptr<AVPacket> packet(static_cast<AVPacket*>(av_malloc(sizeof(AVPacket))), [&](AVPacket *p) { av_packet_free(&p); av_freep(&p);});
    av_init_packet(packet.get());
    lastReadPacktTime = av_gettime();
    int ret = av_read_frame(inputContext, packet.get());
    if(ret >= 0)
    {
        return packet;
    }
    else
    {
        return nullptr;
    }
}
void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
{
    if (pkt->pts != AV_NOPTS_VALUE)
        pkt->pts = av_rescale_q(pkt->pts, src_tb, dst_tb);
    if (pkt->dts != AV_NOPTS_VALUE)
        pkt->dts = av_rescale_q(pkt->dts, src_tb, dst_tb);
    if (pkt->duration > 0)
        pkt->duration = av_rescale_q(pkt->duration, src_tb, dst_tb);
}
int WritePacket(shared_ptr<AVPacket> packet)
{
    auto inputStream = inputContext->streams[packet->stream_index];
    auto outputStream = outputContext->streams[packet->stream_index];                
    av_packet_rescale_ts(packet.get(),inputStream->time_base,outputStream->time_base);
    return av_interleaved_write_frame(outputContext, packet.get());
}

int OpenOutput(string outUrl)
{

    int ret  = avformat_alloc_output_context2(&outputContext, nullptr, "flv", outUrl.c_str());
    if(ret < 0)
    {
        av_log(NULL, AV_LOG_ERROR, "open output context failed\n");
        goto Error;
    }

    ret = avio_open2(&outputContext->pb, outUrl.c_str(), AVIO_FLAG_WRITE,nullptr, nullptr);    
    if(ret < 0)
    {
        av_log(NULL, AV_LOG_ERROR, "open avio failed");
        goto Error;
    }

    for(int i = 0; i < inputContext->nb_streams; i++)
    {
        AVStream * stream = avformat_new_stream(outputContext, inputContext->streams[i]->codec->codec);                
        ret = avcodec_copy_context(stream->codec, inputContext->streams[i]->codec);    
        stream->codec->codec_tag = 0;
        if(ret < 0)
        {
            av_log(NULL, AV_LOG_ERROR, "copy coddec context failed");
            goto Error;
        }
    }

    ret = avformat_write_header(outputContext, nullptr);
    if(ret < 0)
    {
        av_log(NULL, AV_LOG_ERROR, "format write header failed");
        goto Error;
    }

    av_log(NULL, AV_LOG_FATAL, " Open output file success %s\n",outUrl.c_str());            
    return ret ;
Error:
    if(outputContext)
    {
        for(int i = 0; i < outputContext->nb_streams; i++)
        {
            avcodec_close(outputContext->streams[i]->codec);
        }
        avformat_close_input(&outputContext);
    }
    return ret ;
}

void CloseInput()
{
    if(inputContext != nullptr)
    {
        avformat_close_input(&inputContext);
    }
}

void CloseOutput()
{
    if(outputContext != nullptr)
    {
        for(int i = 0 ; i < outputContext->nb_streams; i++)
        {
            AVCodecContext *codecContext = outputContext->streams[i]->codec;
            avcodec_close(codecContext);
        }
        avformat_close_input(&outputContext);
    }
}
void Init()
{
    av_register_all();
    avfilter_register_all();
    avformat_network_init();
    av_log_set_level(AV_LOG_ERROR);
}

int  InitUdpSocket(string ip,int port)
{

    WSADATA wsaData;                
    SOCKET sockListener;
    sockaddr_in RecvAddr;

    auto iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
                if (iResult != NO_ERROR) {
                    wprintf(L"WSAStartup failed with error %d\n", iResult);
                    return -1;
                }
    udpSocket.RecvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if (udpSocket.RecvSocket == INVALID_SOCKET) {
        wprintf(L"socket failed with error %d\n", WSAGetLastError());
        return  -1;
    }
    //-----------------------------------------------
    // Bind the socket to any address and the specified port.
    RecvAddr.sin_family = AF_INET;
    RecvAddr.sin_port = htons(port);
    RecvAddr.sin_addr.s_addr = inet_addr(ip.c_str());
    int nNetTimeout = 10000;
    auto ret1 = setsockopt(udpSocket.RecvSocket,SOL_SOCKET,SO_RCVTIMEO,( char *)&nNetTimeout, sizeof(struct timeval));
    iResult = ::bind(udpSocket.RecvSocket, (SOCKADDR *) & RecvAddr, sizeof (RecvAddr));
    if (iResult != 0) {
        wprintf(L"bind failed with error %d\n", WSAGetLastError());
        return -1;
    }
    return 0;
}
int main(int argc, char* argv[])
{
    Init();
    string ip = "127.0.0.1";
    int port = 1234;
    int ret = InitUdpSocket(ip,port);
    if(ret <0 )
    {
        cout <<"Init Udp Socket failed"<<endl;
        goto Error;
    }
    ret = OpenInput();
    if(ret >= 0)
    {
        ret = OpenOutput("rtmp://192.168.169.139/live/stream0"); 
    }
    if(ret <0) goto Error;

    while(true)
    {
        auto packet = ReadPacketFromSource();
        if(packet)
        {
            ret = WritePacket(packet);
            if(ret >= 0)
            {
                cout<<"WritePacket Success!"<<endl;
            }
            else
            {
                cout<<"WritePacket failed!"<<endl;
            }
        }
        else
        {
            break;
        }
    }


Error:
    CloseInput();
    CloseOutput();
    while(true)
    {
        this_thread::sleep_for(chrono::seconds(100));
    }
    return 0;
}

main.cpp