testFfmpeg1.zip_QT_ffmpeg_qt ffmpeg_qt+ffmpeg

#include "qffmpeg.h" #include <QDateTime> #include <QDebug> QFFmpeg::QFFmpeg(QObject *parent) : QObject(parent) { videoStreamIndex=-1; av_register_all();//注册库中所有可用的文件格式和解码器 avformat_network_init();//初始化网络流格式,使用RTSP网络流时必须先执行 pAVFormatContext = avformat_alloc_context();//申请一个AVFormatContext结构的内存,并进行简单初始化 pAVFrame=av_frame_alloc(); } QFFmpeg::~QFFmpeg() { avformat_free_context(pAVFormatContext); av_frame_free(&pAVFrame); sws_freeContext(pSwsContext); } bool QFFmpeg::Init() { //视频延时问题？？？ // pAVFormatContext->max_interleave_delta > 0; // pAVFormatContext->max_interleave_delta = 1; // AVInputFormat *iformat = new AVInputFormat; // *iformat-> AVDictionary *opts = NULL; av_dict_set(&opts, "rtsp_transport", "tcp", 0); av_dict_set(&opts, "stimeout", "3000000", 0); //打开视频流 int result=avformat_open_input(&pAVFormatContext, url.toStdString().c_str(),NULL,&opts); //int result=avformat_open_input(&pAVFormatContext, url.toStdString().c_str(),NULL,NULL); if (result<0){ qDebug()<<"打开视频流失败"; return false; } //获取视频流信息 result=avformat_find_stream_info(pAVFormatContext,NULL); if (result<0){ qDebug()<<"获取视频流信息失败"; return false; } //获取视频流索引 videoStreamIndex = -1; for (uint i = 0; i < pAVFormatContext->nb_streams; i++) { if (pAVFormatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { videoStreamIndex = i; break; } } if (videoStreamIndex==-1){ qDebug()<<"获取视频流索引失败"; return false; } //获取视频流的分辨率大小 pAVCodecContext = pAVFormatContext->streams[videoStreamIndex]->codec; videoWidth=pAVCodecContext->width; videoHeight=pAVCodecContext->height; avpicture_alloc(&pAVPicture,AV_PIX_FMT_RGB24,videoWidth,videoHeight); AVCodec *pAVCodec; //获取视频流解码器 pAVCodec = avcodec_find_decoder(pAVCodecContext->codec_id); pSwsContext = sws_getContext(videoWidth,videoHeight,AV_PIX_FMT_YUV420P,videoWidth,videoHeight,AV_PIX_FMT_RGB24,SWS_BICUBIC,0,0,0); //打开对应解码器 // //测试解决延时问题 // AVDictionary *param = NULL; // //264 // av_dict_set(&param,"preset","superfast",0); // av_dict_set(&param,"tune","zerolatency",0); // //265 // av_dict_set(&param,"x265-params","qp=20",0); // av_dict_set(&param,"preset","ultrafast",0); // av_dict_set(&param,"tune","zero-latency",0); // result=avcodec_open2(pAVCodecContext,pAVCodec,&param); result=avcodec_open2(pAVCodecContext,pAVCodec,NULL); if (result<0){ qDebug()<<"打开解码器失败"; return false; } qDebug()<<"初始化视频流成功"; return true; } void QFFmpeg::Play() { //一帧一帧读取视频 int frameFinished=0; while (true){ if (av_read_frame(pAVFormatContext, &pAVPacket) >= 0){ if(pAVPacket.stream_index==videoStreamIndex){ qDebug()<<"开始解码"<<QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss"); avcodec_decode_video2(pAVCodecContext, pAVFrame, &frameFinished, &pAVPacket); if (frameFinished){ mutex.lock(); sws_scale(pSwsContext,(const uint8_t* const *)pAVFrame->data,pAVFrame->linesize,0,videoHeight,pAVPicture.data,pAVPicture.linesize); //发送获取一帧图像信号 QImage image(pAVPicture.data[0],videoWidth,videoHeight,QImage::Format_RGB888); emit GetImage(image); mutex.unlock(); } } } av_free_packet(&pAVPacket);//释放资源,否则内存会一直上升 } }