(资料图)

XXFmpeg.h

#pragma onceextern \"C\"{#include #include }#include #include class XFFmpeg{public:static XFFmpeg *Get(){static XFFmpeg ff;return &ff;}///打开视频文件，如果上次已经打开就会先关闭///@path path 视频文件路径///@return bool 成功失败 失败信息通过GetError获取bool Open(const char *path);void Close();///返回值需要用户清理AVPacket Read();AVFrame *Decode(const AVPacket *pkt);bool ToRGB(const AVFrame *yuv,char *out,int outwidth, int outheight);std::string GetError();virtual ~XFFmpeg();int totalMs = 0; //时长int videoStream = 0;protected:char errorbuf[1024];AVFormatContext *ic = NULL; //存放视频（流）的文件信息AVFrame *yuv = NULL;SwsContext *cCtx = NULL; //创建转码器的容器QMutex mutex;XFFmpeg();};

XFFmpeg.cpp

#include \"XFFmpeg.h\"#pragma comment(lib,\"avformat.lib\")#pragma comment(lib,\"avutil.lib\")#pragma comment(lib,\"avcodec.lib\")#pragma comment(lib,\"swscale.lib\")bool XFFmpeg::Open(const char *path){int re = 0;int err = 0;Close();mutex.lock();re = avformat_open_input(&ic, path, 0, 0); //打开if (re != 0){mutex.unlock();av_strerror(re, errorbuf, sizeof(errorbuf));printf(\"open failed %s
\", path, errorbuf);return false;}totalMs = (ic->duration / AV_TIME_BASE)*1000;for (int i = 0; i < ic->nb_streams; i++){AVCodecContext *enc = ic->streams[i]->codec;if (enc->codec_type == AVMEDIA_TYPE_VIDEO)//表示为一个视频{videoStream = i;AVCodec *codec = avcodec_find_decoder(enc->codec_id); //判断系统有没有这个解码器if (!codec){mutex.unlock();printf(\"video code not find!!
\");return false;}err = avcodec_open2(enc, codec,NULL); //找到系统中这个解码器的话，就打开这个解码器。if (err != 0){mutex.unlock();char buf[1024] = { 0 };av_strerror(re, errorbuf, sizeof(errorbuf));printf(\"buf
\", path, errorbuf);return false;}printf(\"open avcodec_open2 success!!!
\");}}mutex.unlock();return true;}AVPacket XFFmpeg::Read(){AVPacket pkt;int err = 0;memset(&pkt,0,sizeof(AVPacket));mutex.lock();if (!ic) //判断视频文件被打开没，没被打开的话，直接退出。{mutex.unlock();return pkt; //这时候的pkt也是空的}err = av_read_frame(ic, &pkt);if (err != 0){av_strerror(err, errorbuf, sizeof(errorbuf));}mutex.unlock();return pkt;}void XFFmpeg::Close(){mutex.lock();if (ic) avformat_close_input(&ic);if (yuv) av_frame_free(&yuv);if (cCtx){sws_freeContext(cCtx);cCtx = NULL;}mutex.unlock();}std::string XFFmpeg::GetError(){mutex.lock();std::string re = this->errorbuf;mutex.unlock();return re;}AVFrame *XFFmpeg::Decode(const AVPacket *pkt){int re = 0;mutex.lock();if (!ic) //判断视频文件被打开没，没被打开的话，直接退出。{mutex.unlock();return NULL; //这时候的pkt也是空的}if (yuv == NULL){yuv = av_frame_alloc();}re = avcodec_send_packet(ic->streams[pkt->stream_index]->codec,pkt);if (re != 0){mutex.unlock();//av_packet_unref(&pkt);return NULL;}re = avcodec_receive_frame(ic->streams[pkt->stream_index]->codec,yuv);if (re != 0){mutex.unlock();//av_packet_unref(&pkt);return NULL;}mutex.unlock();return yuv;}bool XFFmpeg::ToRGB(const AVFrame *yuv, char *out, int outwidth, int outheight){mutex.lock();if (!ic) //判断视频文件被打开没，没被打开的话，直接退出。{mutex.unlock();return false;}AVCodecContext *videoCtx = ic->streams[this->videoStream]->codec;//在ic中的streams数组中找到这个codec,//打开转码器cCtx = sws_getCachedContext(cCtx, videoCtx->width,videoCtx->height,videoCtx->pix_fmt,outwidth, outheight,AV_PIX_FMT_BGRA,SWS_BICUBIC,NULL, NULL, NULL);if (!cCtx){mutex.unlock();printf(\"sws_getCachedContext failed!!
\");return false;}uint8_t *data[AV_NUM_DATA_POINTERS] = { 0 }; //转码的目标数据data[0] = (uint8_t *)out;int linesize[AV_NUM_DATA_POINTERS] = { 0 };linesize[0] = outwidth * 4;int h = sws_scale(cCtx,yuv->data,yuv->linesize,0,videoCtx->height,data,linesize);if (h >0)printf(\"(%d)\", h);mutex.unlock();return true;}XFFmpeg::XFFmpeg(){errorbuf[0] = "\0";av_register_all(); //注册所有的编解码器和文件格式。}XFFmpeg::~XFFmpeg(){}

main.cpp

#include \"xplay.h\"#include #include \"XFFmpeg.h\"#define OUT_WIDTH 800#define OUT_HEIGHT 600int main(int argc, char *argv[]){char *rgb = new char[OUT_WIDTH*OUT_HEIGHT * 4]; //图像的数据RGBAif (XFFmpeg::Get()->Open(\"my.mp4\")){printf(\"open success!
\");}else{printf(\"open failed!%s\", XFFmpeg::Get()->GetError().c_str());getchar();return -1;}while (1){AVPacket pkt = XFFmpeg::Get()->Read();if (pkt.size == 0)break;printf(\"pts=%lld
\", pkt.pts);if (pkt.stream_index != XFFmpeg::Get()->videoStream){av_packet_unref(&pkt); //如果不是视频格式的 就释放掉continue;}AVFrame *yuv = XFFmpeg::Get()->Decode(&pkt); //解码视频if (yuv){printf(\"[D]\");XFFmpeg::Get()->ToRGB(yuv, rgb, OUT_WIDTH, OUT_HEIGHT);}av_packet_unref(&pkt);}QApplication a(argc, argv);Xplay w;w.show();return a.exec();}

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