feat: rotate webcam in Mjpegstreamer-adaptive mode (#923)

src/components/settings/SettingsWebcamsTab.vue

@@ -163,6 +163,17 @@
                                         :label="$t('Settings.WebcamsTab.TargetFPS')"></v-text-field>
                                 </v-col>
                             </v-row>
+                            <v-row v-if="form.service === 'mjpegstreamer-adaptive'">
+                                <v-col class="py-2">
+                                    <v-select
+                                        v-model="form.rotate"
+                                        :items="rotateItems"
+                                        outlined
+                                        dense
+                                        hide-details
+                                        :label="$t('Settings.WebcamsTab.Rotate')"></v-select>
+                                </v-col>
+                            </v-row>
                             <v-row>
                                 <v-col class="py-1">
                                     <v-checkbox
@@ -242,6 +253,7 @@ interface webcamForm {
     targetFps: number
     urlStream: string
     urlSnapshot: string
+    rotate: number
     flipX: boolean
     flipY: boolean
 }
@@ -272,6 +284,7 @@ export default class SettingsWebcamsTab extends Mixins(BaseMixin, WebcamMixin) {
         targetFps: 15,
         urlStream: '',
         urlSnapshot: '',
+        rotate: 0,
         flipX: false,
         flipY: false,
     }
@@ -281,6 +294,13 @@ export default class SettingsWebcamsTab extends Mixins(BaseMixin, WebcamMixin) {
         unique: (value: string) => !this.existsWebcamName(value) || this.$t('Settings.WebcamsTab.NameAlreadyExists'),
     }
 
+    private rotateItems = [
+        { value: 0, text: '0°' },
+        { value: 90, text: '90°' },
+        { value: 180, text: '180°' },
+        { value: 270, text: '270°' },
+    ]
+
     declare $refs: {
         webcamForm: any
     }
@@ -348,6 +368,7 @@ export default class SettingsWebcamsTab extends Mixins(BaseMixin, WebcamMixin) {
         this.form.targetFps = webcam.targetFps
         this.form.urlStream = webcam.urlStream
         this.form.urlSnapshot = webcam.urlSnapshot
+        this.form.rotate = webcam.rotate ?? 0
         this.form.flipX = webcam.flipX
         this.form.flipY = webcam.flipY
 
@@ -368,6 +389,7 @@ export default class SettingsWebcamsTab extends Mixins(BaseMixin, WebcamMixin) {
                 targetFps: this.form.targetFps,
                 urlStream: this.form.urlStream,
                 urlSnapshot: this.form.urlSnapshot,
+                rotate: this.form.rotate,
                 flipX: this.form.flipX,
                 flipY: this.form.flipY,
             }
@@ -392,6 +414,7 @@ export default class SettingsWebcamsTab extends Mixins(BaseMixin, WebcamMixin) {
         this.form.targetFps = 15
         this.form.urlStream = '/webcam/?action=stream'
         this.form.urlSnapshot = '/webcam/?action=snapshot'
+        this.form.rotate = 0
         this.form.flipX = false
         this.form.flipY = false
     }

src/components/webcams/MjpegstreamerAdaptive.vue

@@ -34,7 +34,7 @@
 
 <script lang="ts">
 import Component from 'vue-class-component'
-import { Mixins, Prop } from 'vue-property-decorator'
+import { Mixins, Prop, Watch } from 'vue-property-decorator'
 import BaseMixin from '@/components/mixins/base'
 
 @Component
@@ -70,8 +70,9 @@ export default class MjpegstreamerAdaptive extends Mixins(BaseMixin) {
         }
 
         let transforms = ''
-        if ('flipX' in this.camSettings && this.camSettings.flipX) transforms += ' scaleX(-1)'
+        if (this.camSettings.flipX ?? false) transforms += ' scaleX(-1)'
-        if ('flipX' in this.camSettings && this.camSettings.flipY) transforms += ' scaleY(-1)'
+        if (this.camSettings.flipY ?? false) transforms += ' scaleY(-1)'
+        if ((this.camSettings.rotate ?? 0) === 180) transforms += ' rotate(180deg)'
         if (transforms.trimStart().length) output.transform = transforms.trimStart()
 
         if (this.aspectRatio) output.aspectRatio = this.aspectRatio
@@ -83,6 +84,10 @@ export default class MjpegstreamerAdaptive extends Mixins(BaseMixin) {
         return this.currentFPS < 10 ? '0' + this.currentFPS.toString() : this.currentFPS
     }
 
+    get rotate() {
+        return [90, 270].includes(this.camSettings.rotate ?? 0)
+    }
+
     refreshFrame() {
         if (this.isVisible) {
             this.refresh = new Date().getTime()
@@ -105,12 +110,31 @@ export default class MjpegstreamerAdaptive extends Mixins(BaseMixin) {
             const frame: any = await this.loadImage(url.toString())
 
             canvas.width = canvas.clientWidth
-            canvas.height = canvas.clientWidth * (frame.height / frame.width)
+            if (this.rotate) {
-            if (this.aspectRatio === null) {
+                if (this.aspectRatio === null) this.aspectRatio = frame.height / frame.width
-                this.aspectRatio = frame.width / frame.height
+                canvas.height = canvas.clientWidth / (frame.height / frame.width)
+            } else {
+                if (this.aspectRatio === null) this.aspectRatio = frame.width / frame.height
+                canvas.height = canvas.clientWidth * (frame.width / frame.height)
             }
 
-            await ctx?.drawImage(frame, 0, 0, frame.width, frame.height, 0, 0, canvas.width, canvas.height)
+            if (this.rotate) {
+                const scale = canvas.height / frame.width
+                const x = canvas.width / 2
+                const y = canvas.height / 2
+                ctx.translate(x, y)
+                ctx.rotate((this.camSettings.rotate * Math.PI) / 180)
+                await ctx?.drawImage(
+                    frame,
+                    (-frame.width / 2) * scale,
+                    (-frame.height / 2) * scale,
+                    frame.width * scale,
+                    frame.height * scale
+                )
+                ctx.rotate(-((this.camSettings.rotate * Math.PI) / 180))
+                ctx.translate(-x, -y)
+            } else await ctx?.drawImage(frame, 0, 0, frame.width, frame.height, 0, 0, canvas.width, canvas.height)
+
             this.isLoaded = true
         }
 
@@ -190,5 +214,10 @@ export default class MjpegstreamerAdaptive extends Mixins(BaseMixin) {
         clearTimeout(this.timer)
         this.timer = undefined
     }
+
+    @Watch('camSettings', { immediate: true, deep: true })
+    camSettingsChanged() {
+        this.aspectRatio = null
+    }
 }
 </script>

src/locales/en.json

@@ -950,6 +950,7 @@
             "Name": "Name",
             "NameAlreadyExists": "Name already exists",
             "Required": "required",
+            "Rotate": "Rotate",
             "SaveWebcam": "Save Webcam",
             "Service": "Service",
             "TargetFPS": "Target FPS",

src/store/gui/webcams/types.ts

@@ -12,6 +12,7 @@ export interface GuiWebcamStateWebcam {
     targetFps: number
     urlStream: string
     urlSnapshot: string
+    rotate?: number
     flipX: boolean
     flipY: boolean
 }