VideoStream/service/tool.go

package service

import (
	"VideoStream/dao"
	"VideoStream/proto"
	"fmt"
	"gocv.io/x/gocv"
	"image"
	"image/color"
	"log"
	"net/http"
	"sync"
	"time"
)

var DeviceRWMap = make(map[int]sync.RWMutex)
var DeviceCurrentFrameMap = make(map[int]gocv.Mat)
var DeviceFrameCount = make(map[int]int)
var DeviceIsStop = make(map[int]bool)

func SetDeviceCurrentFrame(frame gocv.Mat, device_id int) error {
	//获取读写锁
	mutex, ok := DeviceRWMap[device_id]
	if !ok {
		return fmt.Errorf("设备:%s 读写锁不存在", device_id)
	}
	mutex.Lock()
	defer mutex.Unlock()
	//设置当前帧
	DeviceCurrentFrameMap[device_id] = frame
	DeviceFrameCount[device_id]++
	return nil
}

func GetDeviceCurrentFrame(device_id int) (gocv.Mat, int) {
	//获取读写锁
	mutex, ok := DeviceRWMap[device_id]
	if !ok {
		return gocv.NewMat(), -1
	}
	mutex.RLock()
	defer mutex.RUnlock()
	//获取当前帧
	return DeviceCurrentFrameMap[device_id], DeviceFrameCount[device_id]
}

func getVideoFrame(device proto.DeviceInfo) {
	webcam, err := gocv.OpenVideoCapture(device.Stream)
	if err != nil {
		fmt.Printf("设备:%s 错误: 无法打开视频流，err: %v\n", device.ID, err)
		return
	}
	defer webcam.Close()
	// 字体相关设置，对应OpenCV默认字体等，这里简化处理，实际可按需求调整
	font := gocv.FontHersheySimplex
	fontScale := 0.5
	fontColor := color.RGBA{G: 255}
	lineType := 2
	z := 0
	for {
		if device.LogFrame > 0 && z%device.LogFrame == 0 {
			fmt.Printf("设备:%s 当前帧: %d\n", device.ID, z)
		}
		if device.NextStop {
			break
		}
		frame := gocv.NewMat()
		ok := webcam.Read(&frame)
		if !ok {
			fmt.Printf("设备:%s 错误: 无法从视频流中读取帧\n", device)
			break
		}
		if frame.Empty() {
			fmt.Printf("设备:%s 错误: 无法从视频流中读取帧\n", device)
			//等待50ms
			time.Sleep(50 * time.Millisecond)
			continue
		}
		height := frame.Rows()
		width := frame.Cols()
		if height < device.CheckFrameHeight || width < device.CheckFrameWidth {
			fmt.Printf("设备:%s 帧尺寸已改变\n", device)
			break
		}
		currentTime := time.Now().Format("2006-01-02 15:04:05")
		gocv.PutText(&frame, currentTime, image.Point{10, 20}, font, fontScale, fontColor, lineType)
		//需要将帧付给全局变量
		err := SetDeviceCurrentFrame(frame, device.ID)
		if err != nil {
			fmt.Printf("设备:%s 错误: 无法设置当前帧\n", device)
		}
		z++
	}
}

// 发起get请求,返回响应状态码
func Get(url string) int {
	req, err := http.NewRequest("GET", url, nil)
	var client = &http.Client{}
	if err != nil {
		return 500
	}
	resp, err := client.Do(req)
	if err != nil {
		return 500
	}
	return resp.StatusCode
}

func GetVideoStream(id int) {
	for {
		var device proto.DeviceInfo
		var index int
		//获取设备信息
		for i, device1 := range proto.Config.DeviceInfo {
			if device1.ID == id {
				device = device1
				break
			}
			index = i
		}
		if index == len(proto.Config.DeviceInfo) {
			//设备不存在
			log.Println("device:", id, " not found")
			break
		}
		if device.NextStop {
			DeviceIsStop[id] = true
			break
		}
		//设置设备控制信息
		status := Get(device.Control)
		DeviceIsStop[id] = false
		log.Println("device:", device.ID, " set control info status:", status)
		getVideoFrame(device)
	}

}

func DoGetVideoStream() {
	for _, device := range proto.Config.DeviceInfo {
		go GetVideoStream(device.ID)
	}
}

func GetDevice(id, auth_id int) dao.Device {
	return dao.FindDeviceByID(id, auth_id)
}