添加视频流接口

handler/device.go

@@ -2,6 +2,7 @@ package handler
 
 import (
 	"context"
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"github.com/gin-gonic/gin"
@@ -60,7 +61,7 @@ func SetUpDeviceGroup(router *gin.Engine) {
 	deviceGroup.POST("/update_device", UpdateDevice)
 	deviceGroup.POST("/delete_device", DeleteDevice)
 	deviceGroup.GET("/get_real_time_image", GetRealTimeImage)
-
+	deviceGroup.POST("/video_feed", VideoFeed)
 }
 
 func DeleteDevice(c *gin.Context) {
@@ -301,3 +302,120 @@ end:
 	}
 
 }
+
+// VideoFeed 函数用于处理视频流的获取与返回，支持根据前端连接情况控制发送
+func VideoFeed(c *gin.Context) {
+	// 更严谨地获取并转换 id 参数，处理可能的错误
+	id, ok := c.Get("id")
+	if !ok {
+		c.JSON(http.StatusInternalServerError, gin.H{"code": proto.DataNotFound, "message": "id not found in context"})
+		return
+	}
+	floatId, ok := id.(float64)
+	if !ok {
+		c.JSON(http.StatusInternalServerError, gin.H{"code": proto.DataFormatError, "message": "invalid id type in context"})
+		return
+	}
+	user_id := int(floatId)
+
+	device_id := c.Query("device_id")
+	device_id_int, err := strconv.Atoi(device_id)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"code": proto.DataFormatError, "message": "invalid device_id format"})
+		return
+	}
+
+	c.Header("Content-Type", "multipart/x-mixed-replace; boundary=frame") // 设置响应头
+
+	device := service.GetDevice(device_id_int, user_id)
+	if device.ID == 0 {
+		c.JSON(http.StatusOK, gin.H{"code": proto.DataNotFound, "message": "device not found"})
+		return
+	}
+
+	// 在 Redis 中设置设备正在播放状态及过期时间，处理设置失败的情况
+	isSuccess := worker.SetRedisWithExpire(strconv.Itoa(int(device.ID))+"_is_play", "1", time.Minute*5)
+	if isSuccess == false {
+		fmt.Println("set redis is_play error:", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"code": proto.OperationFailed, "message": "failed to set device play status in Redis"})
+		return
+	}
+	fmt.Println("device_id:", device_id_int, " has set is_play to 1")
+
+	ctx := context.Background()
+	pubSub := worker.RedisClient.Subscribe(ctx, strconv.Itoa(device_id_int)+"_frames_msgs")
+
+	defer func() {
+		err = pubSub.Close()
+		if err != nil {
+			fmt.Println("close pubSub error:", err)
+		}
+	}()
+
+	// 生成唯一连接 uuid
+	//conId := uuid.New().String()
+	//onlineConnKey := "device_" + strconv.Itoa(device_id_int) + "_online_conn_ids"
+	//// 加入设备在线连接集合，处理添加失败的情况
+	//worker.SetRedisSetAdd(onlineConnKey, conId)
+
+	// 创建一个通道用于接收客户端连接关闭的信号
+	clientClosed := make(chan struct{})
+	c.Stream(func(w http.ResponseWriter) bool {
+		// 将读取 Redis 消息通道的逻辑放在这里，方便根据返回值控制循环
+		ch := pubSub.Channel()
+		for {
+			select {
+			case msg, ok := <-ch:
+				if !ok {
+					// 如果 Redis 通道关闭，进行相应处理并返回 false 停止发送
+					fmt.Println("Redis channel closed unexpectedly")
+					c.JSON(http.StatusInternalServerError, gin.H{"code": proto.RedisSetError, "message": "Redis channel closed"})
+					return false
+				}
+				// 将 base64 图片数据解析为图片
+				frame := msg.Payload
+				buf, err := base64.StdEncoding.DecodeString(frame)
+				if err != nil {
+					fmt.Println("base64 decode error:", err)
+					continue
+				}
+				// 按照视频流格式要求构造并返回响应数据
+				_, err = w.Write([]byte("--frame\r\n"))
+				if err != nil {
+					fmt.Println("write video frame error:", err)
+					continue
+				}
+				_, err = w.Write([]byte("Content-Type: image/jpeg\r\n\r\n"))
+				if err != nil {
+					fmt.Println("write video frame error:", err)
+					continue
+				}
+				_, err = w.Write(buf)
+				if err != nil {
+					fmt.Println("write video frame error:", err)
+					continue
+				}
+				_, err = w.Write([]byte("\r\n"))
+				if err != nil {
+					fmt.Println("write video frame error:", err)
+					continue
+				}
+			case <-clientClosed:
+				// 当接收到客户端关闭连接的信号，返回 false 停止发送视频流
+				return false
+			}
+		}
+	})
+
+	// 启动一个协程来监测客户端连接是否关闭，关闭时向 clientClosed 通道发送信号
+	go func() {
+		<-c.Request.Context().Done()
+		close(clientClosed)
+	}()
+
+	// 查看是否还有其他连接，没有则设置 is_play 为 0
+	//if worker.IsContainKey(onlineConnKey) == false {
+	//	worker.SetRedisWithExpire(strconv.Itoa(device_id_int)+"_is_play", "0", time.Minute*5)
+	//	fmt.Println("device_id:", device_id, " has set is_play to 0")
+	//}
+}

proto/status.go

@@ -61,4 +61,6 @@ const (
 	NoUploadPermissions  = 76 // 无上传权限
 	DeleteFileFailed     = 77 // 删除文件失败
 	DeleteFileInfoFailed = 78 // 删除文件信息失败
+
+	DataFormatError = 80 // 数据格式错误
 )