基于libvlc+opencv实现rtsp实时取流显示 |
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一、环境配置 由于最新版本VLC播放器中已经不包含SDK，特贴出下载链接方便各位朋友进行下载(本人下载的是最新版本vlc-3.0.4-win64)。 下载链接为 http://download.videolan.org/pub/videolan/vlc/ 1.windows端 （1）拷贝压缩包vlc-3.0.4-win64\vlc-3.0.4\sdk中的include和lib文件夹到个人项目中。 （2）拷贝压缩包vlc-3.0.4-win64\vlc-3.0.4\中的plugins文件夹和libvlc.dll、libvlccore.dll至可执行程序目录。 （3）配置项目引用。（本人使用VS2013，属性-》配置属性-》C/C++ -》常规-》附加包含目录、属性-》配置属性-》链接器 -》常规-》附加库目录） 2.linux端 详情请见github https://github.com/alonegiveup/vlc_demo 以上配置完成后即可使用libvlc库进行rtsp取流实验。 二、代码实现 vlc_reader.h #pragma once #include #include #include "vlc/vlc.h" #include "opencv2/opencv.hpp" class vlc_reader { public: vlc_reader(char* url = 0); ~vlc_reader(); void start(int wantW = 640, int wantH = 480); void pause(bool paused); cv::Mat frame(); int w, h; private: char* rtspAddress = ""; std::mutex mtx; std::queue video_queue; libvlc_instance_t *inst; libvlc_media_player_t *mp; unsigned char *pixel; static void *cb_lock(void *opaque, void **plane); static void cb_unlock(void *opaque, void *picture, void * const *plane); static void cb_display(void *opaque, void *picture); };vlc_reader.cpp #include "vlc_reader.h" #pragma comment(lib, "libvlc.lib") #pragma comment(lib, "libvlccore.lib") #define MAX_QUEUE 50 //最大队列空间 vlc_reader::vlc_reader(char*url) : inst(0), mp(0), pixel(0), w(0), h(0), rtspAddress(url) { //vlc构建参数 测试--network-caching=300效果较好 const char * const vlc_args[] = { "-I", "dummy", "--ignore-config", "--network-caching=300", "--rtsp-tcp", "--no-audio", "--extraintf=logger", "--verbose=1" }; printf("%d\n", sizeof(vlc_args) / sizeof(vlc_args[0])); inst = libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args); mp = libvlc_media_player_new(inst); libvlc_video_set_callbacks(mp, &cb_lock, &cb_unlock, &cb_display, this);//设置回调函数 } vlc_reader::~vlc_reader() { delete[] pixel; //释放图像数据储存内存 std::queue empty; swap(empty, video_queue); //释放队列存储空间 libvlc_media_player_stop(mp); //释放vlc句柄 libvlc_media_player_release(mp); libvlc_release(inst); } void vlc_reader::start(int wantW, int wantH) { this->w = wantW; this->h = wantH; if (pixel == nullptr) { pixel = new unsigned char[wantW*wantH * 4]; } libvlc_media_player_pause(mp); libvlc_media_t *media = libvlc_media_new_location(inst, rtspAddress); libvlc_media_player_set_media(mp, media); libvlc_media_release(media); libvlc_video_set_format(mp, "RGBA", wantW, wantH, wantW * 4);//设置取流参数 以RGBA格式取流 libvlc_media_player_play(mp); } void vlc_reader::pause(bool paused) { if (mp){ libvlc_media_player_set_pause(mp, paused); } } cv::Mat vlc_reader::frame() //从队列中取出一帧数据 { cv::Mat img; if (!this->video_queue.empty()) { img = this->video_queue.front(); this->video_queue.pop(); } return img; } void* vlc_reader::cb_lock(void *opaque, void **plane) { vlc_reader *p = (vlc_reader*)opaque; p->mtx.lock(); *plane = p->pixel; return *plane; } void vlc_reader::cb_unlock(void *opaque, void *picture, void * const *plane) { vlc_reader *p = (vlc_reader*)opaque; unsigned char *pix = (unsigned char*)picture; if (pix) { cv::Mat img = cv::Mat(cv::Size(p->w, p->h), CV_8UC4, pix); cv::cvtColor(img, img, CV_RGBA2BGR); if (p->video_queue.size() < MAX_QUEUE) { p->video_queue.push(img); } else { std::queue empty; swap(empty, p->video_queue); } p->mtx.unlock(); } } void vlc_reader::cb_display(void *opaque, void *picture) { }vlc_test.cpp #include "vlc_reader.h" int main() { vlc_reader r("rtsp://admin:[email protected]:554/cam/realmonitor?channel=1&subtype=0"); vlc_reader r2("rtsp://admin:[email protected]:554/Streaming/Channels/101?transportmode=unicast "); int rtsp_w = 640, rtsp_h = 480; r.start(rtsp_w, rtsp_h); r2.start(rtsp_w, rtsp_h); while (1) { cv::Mat frame = r.frame(); cv::Mat frame2 = r2.frame(); if (!frame.empty()) { imshow("test", frame); int ch = cv::waitKey(1); if (ch > 0) break; } if (!frame2.empty()){ imshow("test2",frame2); int ch = cv::waitKey(1); if (ch > 0) break; } } return 0; }以上即可完成，rtsp取流显示。若各位使用中发现任何问题，请及时和我联系。我会尽我可能给各位提供帮助。 |
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