XDemux.cpp新增

AVPacket *XDemux::Read()
{mux.lock();if (!ic) //容错{mux.unlock();return 0;}AVPacket *pkt = av_packet_alloc();//读取一帧，并分配空间int re = av_read_frame(ic, pkt);if (re != 0){mux.unlock();av_packet_free(&pkt);return 0;}//pts转换为毫秒pkt->pts = pkt->pts*(1000 * (r2d(ic->streams[pkt->stream_index]->time_base)));pkt->dts = pkt->dts*(1000 * (r2d(ic->streams[pkt->stream_index]->time_base)));mux.unlock();cout << pkt->pts << " "<<flush;return pkt;
}

main.cpp新增代码

    for (;;){AVPacket *pkt = demux.Read();if (!pkt)break;}

完整代码如下：

main.cpp

#include "XPlay2.h"#include <QApplication>
#include <iostream>
using namespace std;
#include "XDemux.h"int main(int argc, char *argv[])
{///测试XDemuxXDemux demux;//香港卫视const char *url = "rtmp://mobliestream.c3tv.com:554/live/goodtv.sdp";
//    url = "001111.mp4";cout<<"demux.Open = "<<demux.Open(url);for (;;){AVPacket *pkt = demux.Read();if (!pkt)break;}QApplication a(argc, argv);XPlay2 w;w.show();return a.exec();
}

XDemux.h

#ifndef XDEMUX_H
#define XDEMUX_H#include <mutex>
struct AVFormatContext;
struct AVPacket;class XDemux
{
public://打开媒体文件，或者流媒体 rtmp http rstpvirtual bool Open(const char *url);//空间需要调用者释放 ，释放AVPacket对象空间，和数据空间 av_packet_freevirtual AVPacket *Read();XDemux();virtual ~XDemux();//媒体总时长（毫秒）int totalMs = 0;
protected:std::mutex mux;//解封装上下文AVFormatContext *ic = NULL;//音视频索引，读取时区分音视频int videoStream = 0;int audioStream = 1;};#endif // XDEMUX_H

XDemux.cpp

#include "XDemux.h"
#include <iostream>
using namespace std;
extern "C" {#include "libavformat/avformat.h"
}#pragma comment(lib,"avformat.lib")
#pragma comment(lib,"avutil.lib")
#pragma comment(lib,"avcodec.lib")
static double r2d(AVRational r)
{return r.den == 0 ? 0 : (double)r.num / (double)r.den;
}
bool XDemux::Open(const char *url)
{//参数设置AVDictionary *opts = NULL;//设置rtsp流已tcp协议打开av_dict_set(&opts, "rtsp_transport", "tcp", 0);//网络延时时间av_dict_set(&opts, "max_delay", "5000", 0);mux.lock();int re = avformat_open_input(&ic,url,0,  // 0表示自动选择解封器&opts //参数设置，比如rtsp的延时时间);if (re != 0){mux.unlock();char buf[1024] = { 0 };av_strerror(re, buf, sizeof(buf) - 1);cout << "open " << url << " failed! :" << buf << endl;return false;}cout << "open " << url << " success! " << endl;//获取流信息re = avformat_find_stream_info(ic, 0);//总时长 毫秒int totalMs = ic->duration / (AV_TIME_BASE / 1000);cout << "totalMs = " << totalMs << endl;//打印视频流详细信息av_dump_format(ic, 0, url, 0);//获取视频流videoStream = av_find_best_stream(ic, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);AVStream *as = ic->streams[videoStream];cout << "=======================================================" << endl;cout << videoStream << "视频信息" << endl;cout << "codec_id = " << as->codecpar->codec_id << endl;cout << "format = " << as->codecpar->format << endl;cout << "width=" << as->codecpar->width << endl;cout << "height=" << as->codecpar->height << endl;//帧率 fps 分数转换cout << "video fps = " << r2d(as->avg_frame_rate) << endl;cout << "=======================================================" << endl;cout << audioStream << "音频信息" << endl;//获取音频流audioStream = av_find_best_stream(ic, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);as = ic->streams[audioStream];cout << "codec_id = " << as->codecpar->codec_id << endl;cout << "format = " << as->codecpar->format << endl;cout << "sample_rate = " << as->codecpar->sample_rate << endl;//AVSampleFormat;cout << "channels = " << as->codecpar->channels << endl;//一帧数据？？ 单通道样本数cout << "frame_size = " << as->codecpar->frame_size << endl;//1024 * 2 * 2 = 4096  fps = sample_rate/frame_sizemux.unlock();return true;
}AVPacket *XDemux::Read()
{mux.lock();if (!ic) //容错{mux.unlock();return 0;}AVPacket *pkt = av_packet_alloc();//读取一帧，并分配空间int re = av_read_frame(ic, pkt);if (re != 0){mux.unlock();av_packet_free(&pkt);return 0;}//pts转换为毫秒pkt->pts = pkt->pts*(1000 * (r2d(ic->streams[pkt->stream_index]->time_base)));pkt->dts = pkt->dts*(1000 * (r2d(ic->streams[pkt->stream_index]->time_base)));mux.unlock();cout << pkt->pts << " "<<flush;return pkt;
}XDemux::XDemux()
{static bool isFirst = true;static std::mutex dmux;dmux.lock();if (isFirst){//初始化封装库av_register_all();//初始化网络库 （可以打开rtsp rtmp http 协议的流媒体视频）avformat_network_init();isFirst = false;}dmux.unlock();
}XDemux::~XDemux()
{}

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XDemux.cpp新增

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