王纲截取ffmpeg混流后数据
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#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
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// 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; }