王纲截取ffmpeg混流后数据

#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

// 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 write muxed data to
buffer. Any questions, you can join QQ group for help, QQ
Group number:127903734 or 766718184.
*/

#include "pch.h"
#include <string>
#include <memory>
#include <thread>
#include <iostream>

#include  <fstream>
using namespace std;



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


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

static int writeUdpSocket(void *opaque, uint8_t *buf, int buf_size)
{
    outputFile.write((const char *)buf, buf_size);
    outputFile.flush();
    return 0;

}
int OpenInput(string inputUrl)
{    
    lastReadPacktTime = av_gettime();    
    inputContext = avformat_alloc_context();
    inputContext->start_time_realtime = av_gettime();

    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 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 && packet->stream_index == 0)
    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()
{

    int ret  = avformat_alloc_output_context2(&outputContext, nullptr, "mpegts", "");
    if(ret < 0)
    {
        av_log(NULL, AV_LOG_ERROR, "open output context failed\n");
        goto Error;
    }
    int size = 32 * 1024;
    uint8_t * iobuffer = (uint8_t *)av_malloc(size);
    AVIOContext *avio = avio_alloc_context(iobuffer, size, AVIO_FLAG_WRITE, 0, NULL, writeUdpSocket, NULL);
    outputContext->pb = avio;    

    //for(int i = 0; i < 1; i++)
    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 main(int argc, char* argv[])
{
    Init();
    string inputUrl = "http://183.207.249.14/PLTV/3/224/3221225567/index.m3u8";
    outputFile.open("D:\\avioWrite2018.flv",std::ios::binary);
    int ret = OpenInput(inputUrl);
    if(ret >= 0)
    {
        ret = OpenOutput(); 
    }
    if(ret <0) goto End;
    int64_t beginTime = av_gettime();
    

    while(av_gettime() - beginTime <2*60*1000*1000)
    {        
        auto packet = ReadPacketFromSource();
        if(packet)
        {
            ret = WritePacket(packet);
            if(ret >= 0)
            {
                cout<<"WritePacket Success!"<<endl;
            }
            else
            {
                cout<<"WritePacket failed!"<<endl;
            }
        }
    }


End:
    CloseInput();
    CloseOutput();
    outputFile.close();
    cout << "endl" << endl;
    while(true)
    {
        this_thread::sleep_for(chrono::seconds(100));
    }
    return 0;
}