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   源码介绍

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// CGaveFile.cpp : 定义控制台应用程序的入口点。
//
/* Copyright [c] 2017-2027 By www.chungen90.com Allrights Reserved 
   This file give a simple example of how to save net stream to 
   local file. Any questions, you can join QQ group for help, QQ
   Group number: 766718184 or 127903734.
*/
#include "stdafx.h"
#include "pch.h"
#include <string>
#include <memory>
#include <thread>
#include <iostream>
using namespace std;

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

static int interrupt_cb(void *ctx)
{
int  timeout  = 3;
if(av_gettime() - lastReadPacktTime > timeout *1000 *1000)
{
return -1;
}
return 0;
}
int OpenInput(string inputUrl)
{
inputContext = avformat_alloc_context(); 
lastReadPacktTime = av_gettime();
inputContext->interrupt_callback.callback = interrupt_cb;
int ret = avformat_open_input(&inputContext, inputUrl.c_str(), 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  %s success\n",inputUrl.c_str());
}
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, "mpegts", 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); 
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 _tmain(int argc, _TCHAR* argv[])
{
Init();
int ret = OpenInput("rtsp://admin:qsy123456@192.168.1.223:554/Streaming/Channels/1");
if(ret >= 0)
{
ret = OpenOutput("D:\\test.ts"); 
}
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;
}