基于qt5.3的简单的ffmpeg视频播放

#include "qffmpeg.h" QFFmpeg::QFFmpeg(QObject *parent) : QObject(parent) { av_register_all(); //pFormatCtx = avformat_alloc_context(); avformat_network_init(); pFrame = av_frame_alloc(); pFrameRGB = av_frame_alloc(); mutex = new QMutex; size = 0; ret = -1; Videostreamindex = -1; gotpicutre = 0; } QFFmpeg::~QFFmpeg() { sws_freeContext(pSwsCtx); av_frame_free(&pFrame); av_frame_free(&pFrameRGB); avcodec_close(pCodecCtx); avformat_close_input(&pFormatCtx); } void QFFmpeg::init_ffmpeg() { int i; char filepath[]= "D:/01.mp4"; result = 1; // strcpy(filepath,(const char*)str.toLocal8Bit()); qDebug()<<filepath; result = avformat_open_input(&pFormatCtx,filepath,NULL,NULL); if(result==0) { qDebug()<<" open file true"; } for(i = 0;i<pFormatCtx->nb_streams;i++) { if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) { Videostreamindex = i; break; } } qDebug()<<"Videostreamindex ="<<Videostreamindex; pCodecCtx = pFormatCtx->streams[Videostreamindex]->codec; pCodec = avcodec_find_decoder(pCodecCtx->codec_id); if(pCodec == NULL) { qDebug()<<"find decoder failed"; } qDebug()<<"codec id is"<<pCodec->id; result=avcodec_open2(pCodecCtx,pCodec,NULL); if(result>=0) { qDebug()<<"open codec "; } qDebug()<<"open codec result is"<<result; Videoheight = pCodecCtx->height; Videowidth = pCodecCtx->width; qDebug()<<"Videowidth is"<<Videowidth; qDebug()<<"Videoheight is"<<Videoheight; //size = avpicture_get_size(AV_PIX_FMT_RGB24,Videowidth,Videoheight); // qDebug()<<"size is "<<size; buffer = (unsigned char*)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_RGB24,Videowidth,Videoheight,1)); av_image_fill_arrays(pFrameRGB->data,pFrameRGB->linesize,buffer,AV_PIX_FMT_RGB24,Videowidth,Videoheight,1); // buffer = (unsigned char*)av_malloc(size*sizeof(unsigned char)); // avpicture_fill((AVPicture*)pFrameRGB,buffer,AV_PIX_FMT_RGB24,Videowidth,Videoheight); //avpicture_alloc(pPicture,AV_PIX_FMT_RGB24,Videowidth,Videoheight); av_dump_format(pFormatCtx,0,filepath,0); pSwsCtx = sws_getContext(Videowidth,Videoheight,AV_PIX_FMT_YUV420P,Videowidth,Videoheight,AV_PIX_FMT_RGB24,SWS_BICUBIC,NULL,NULL,NULL); } void QFFmpeg::play() { pPacket=(AVPacket *)av_malloc(sizeof(AVPacket)); if(av_read_frame(pFormatCtx,pPacket)>=0) { if(pPacket->stream_index == Videostreamindex) { ret=avcodec_decode_video2(pCodecCtx,pFrame,&gotpicutre,pPacket); if(ret < 0) { qDebug()<<"decode ture"; } qDebug()<<"gotpiture is"<<gotpicutre; if(gotpicutre) { mutex->lock(); sws_scale(pSwsCtx,(const unsigned char* const*)pFrame->data,pFrame->linesize,0,pCodecCtx->height, pFrameRGB->data,pFrameRGB->linesize); QImage image((unsigned char*)pFrameRGB->data[0],Videowidth,Videoheight,QImage::Format_RGB888); emit goimage(image); mutex->unlock(); } } av_free_packet(pPacket); } }