Camera plugins refactor

platypush/backend/camera/pi.py

@@ -19,6 +19,10 @@ class CameraPiBackend(Backend):
 
         * **picamera** (``pip install picamera``)
         * **redis** (``pip install redis``) for inter-process communication with the camera process
+
+    This backend is **DEPRECATED**. Use the plugin :class:`platypush.plugins.camera.pi.CameraPiPlugin` instead to run
+    Pi camera actions. If you want to start streaming the camera on application start then simply create an event hook
+    on :class:`platypush.message.event.application.ApplicationStartedEvent` that runs ``camera.pi.start_streaming``.
     """
 
     class CameraAction(Enum):

platypush/backend/http/app/routes/plugins/camera/__init__.py

@@ -1,9 +1,12 @@
-from flask import Response, Blueprint
+import json
-from platypush.plugins.camera import CameraPlugin
+from typing import Optional
+
+from flask import Response, Blueprint, request
 
-from platypush import Config
 from platypush.backend.http.app import template_folder
-from platypush.backend.http.app.utils import authenticate, send_request
+from platypush.backend.http.app.utils import authenticate
+from platypush.context import get_plugin
+from platypush.plugins.camera import CameraPlugin, Camera, StreamWriter
 
 camera = Blueprint('camera', __name__, template_folder=template_folder)
 
@@ -13,75 +16,95 @@ __routes__ = [
 ]
 
 
-def get_device_id(device_id=None):
+def get_camera(plugin: str) -> CameraPlugin:
-    if device_id is None:
+    return get_plugin('camera.' + plugin)
-        device_id = int(send_request(action='camera.get_default_device_id').output)
-    return device_id
 
 
-def get_camera(device_id=None):
+def get_frame(session: Camera, timeout: Optional[float] = None) -> bytes:
-    device_id = get_device_id(device_id)
+    with session.stream.ready:
-    camera_conf = Config.get('camera') or {}
+        session.stream.ready.wait(timeout=timeout)
-    camera_conf['device_id'] = device_id
+        return session.stream.frame
-    return CameraPlugin(**camera_conf)
 
 
-def get_frame(device_id=None):
+def feed(plugin: str, **kwargs):
-    cam = get_camera(device_id)
+    plugin = get_camera(plugin)
-    with cam:
+    with plugin.open(stream=True, **kwargs) as session:
-        frame = None
+        plugin.start_camera(session)
-
-        for _ in range(cam.warmup_frames):
-            output = cam.get_stream()
-
-            with output.ready:
-                output.ready.wait()
-                frame = output.frame
-
-        return frame
-
-
-def video_feed(device_id=None):
-    cam = get_camera(device_id)
-
-    with cam:
         while True:
-            output = cam.get_stream()
+            frame = get_frame(session, timeout=5.0)
-            with output.ready:
+            if frame:
-                output.ready.wait()
+                yield frame
-                frame = output.frame
-
-            if frame and len(frame):
-                yield (b'--frame\r\n'
-                       b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n')
 
 
-@camera.route('/camera/<device_id>/frame', methods=['GET'])
+def get_args(kwargs):
+    kwargs = kwargs.copy()
+    if 't' in kwargs:
+        del kwargs['t']
+
+    for k, v in kwargs.items():
+        if k == 'resolution':
+            v = json.loads('[{}]'.format(v))
+        else:
+            # noinspection PyBroadException
+            try:
+                v = int(v)
+            except:
+                # noinspection PyBroadException
+                try:
+                    v = float(v)
+                except:
+                    pass
+
+        kwargs[k] = v
+
+    return kwargs
+
+
+@camera.route('/camera/<plugin>/photo.<extension>', methods=['GET'])
 @authenticate()
-def get_camera_frame(device_id):
+def get_photo(plugin, extension):
-    frame = get_frame(device_id)
+    plugin = get_camera(plugin)
-    return Response(frame, mimetype='image/jpeg')
+    extension = 'jpeg' if extension in ('jpg', 'jpeg') else extension
+
+    with plugin.open(stream=True, stream_format=extension, frames_dir=None, **get_args(request.args)) as session:
+        plugin.start_camera(session)
+        frame = None
+        for _ in range(session.info.warmup_frames):
+            frame = get_frame(session)
+
+        return Response(frame, mimetype=session.stream.mimetype)
 
 
-@camera.route('/camera/frame', methods=['GET'])
+@camera.route('/camera/<plugin>/video.<extension>', methods=['GET'])
 @authenticate()
-def get_default_camera_frame():
+def get_video(plugin, extension):
-    frame = get_frame()
+    stream_class = StreamWriter.get_class_by_name(extension)
-    return Response(frame, mimetype='image/jpeg')
+    return Response(feed(plugin, stream_format=extension, frames_dir=None, **get_args(request.args)),
+                    mimetype=stream_class.mimetype)
 
 
-@camera.route('/camera/<device_id>/stream', methods=['GET'])
+@camera.route('/camera/<plugin>/photo', methods=['GET'])
 @authenticate()
-def get_stream_feed(device_id):
+def get_photo_default(plugin):
-    return Response(video_feed(device_id),
+    return get_photo(plugin, 'jpeg')
-                    mimetype='multipart/x-mixed-replace; boundary=frame')
 
 
-@camera.route('/camera/stream', methods=['GET'])
+@camera.route('/camera/<plugin>/video', methods=['GET'])
 @authenticate()
-def get_default_stream_feed():
+def get_video_default(plugin):
-    return Response(video_feed(),
+    return get_video(plugin, 'mjpeg')
-                    mimetype='multipart/x-mixed-replace; boundary=frame')
+
+
+@camera.route('/camera/<plugin>/frame', methods=['GET'])
+@authenticate()
+def get_photo_deprecated(plugin):
+    return get_photo_default(plugin)
+
+
+@camera.route('/camera/<plugin>/feed', methods=['GET'])
+@authenticate()
+def get_video_deprecated(plugin):
+    return get_video_default(plugin)
 
 
 # vim:sw=4:ts=4:et:

platypush/backend/http/app/routes/plugins/camera/ir/mlx90640.py

@@ -1,12 +1,8 @@
-import os
+from flask import Blueprint
-import tempfile
 
-from flask import Response, request, Blueprint, send_from_directory
-
-from platypush import Config
 from platypush.backend.http.app import template_folder
-from platypush.backend.http.app.utils import authenticate, send_request
+from platypush.backend.http.app.routes.plugins.camera import get_photo, get_video
-from platypush.plugins.camera.ir.mlx90640 import CameraIrMlx90640Plugin
+from platypush.backend.http.app.utils import authenticate
 
 camera_ir_mlx90640 = Blueprint('camera.ir.mlx90640', __name__, template_folder=template_folder)
 
@@ -16,50 +12,40 @@ __routes__ = [
 ]
 
 
-def get_feed(**_):
+@camera_ir_mlx90640.route('/camera/ir/mlx90640/photo.<extension>', methods=['GET'])
-    camera_conf = Config.get('camera.ir.mlx90640') or {}
+@authenticate()
-    camera = CameraIrMlx90640Plugin(**camera_conf)
+def get_photo_route(extension):
+    return get_photo('ir.mlx90640', extension)
 
-    with camera:
-        while True:
-            output = camera.get_stream()
 
-            with output.ready:
+@camera_ir_mlx90640.route('/camera/ir/mlx90640/video.<extension>', methods=['GET'])
-                output.ready.wait()
+@authenticate()
-                frame = output.frame
+def get_video_route(extension):
+    return get_video('ir.mlx90640', extension)
 
-            if frame and len(frame):
+
-                yield (b'--frame\r\n'
+@camera_ir_mlx90640.route('/camera/ir/mlx90640/photo', methods=['GET'])
-                       b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n')
+@authenticate()
+def get_photo_route_default():
+    return get_photo_route('jpeg')
+
+
+@camera_ir_mlx90640.route('/camera/ir/mlx90640/video', methods=['GET'])
+@authenticate()
+def get_video_route_default():
+    return get_video_route('mjpeg')
 
 
 @camera_ir_mlx90640.route('/camera/ir/mlx90640/frame', methods=['GET'])
 @authenticate()
-def get_frame_route():
+def get_photo_route_deprecated():
-    f = tempfile.NamedTemporaryFile(prefix='ir_camera_frame_', suffix='.jpg', delete=False)
+    return get_photo_route_default()
-    args = {
-        'grayscale': bool(int(request.args.get('grayscale', 0))),
-        'scale_factor': int(request.args.get('scale_factor', 1)),
-        'rotate': int(request.args.get('rotate', 0)),
-        'output_file': f.name,
-    }
-
-    send_request(action='camera.ir.mlx90640.capture', **args)
-    return send_from_directory(os.path.dirname(f.name),
-                               os.path.basename(f.name))
 
 
-@camera_ir_mlx90640.route('/camera/ir/mlx90640/stream', methods=['GET'])
+@camera_ir_mlx90640.route('/camera/ir/mlx90640/feed', methods=['GET'])
 @authenticate()
-def get_feed_route():
+def get_video_route_deprecated():
-    args = {
+    return get_video_route_default()
-        'grayscale': bool(int(request.args.get('grayscale', 0))),
-        'scale_factor': int(request.args.get('scale_factor', 1)),
-        'rotate': int(request.args.get('rotate', 0)),
-        'format': 'jpeg',
-    }
 
-    return Response(get_feed(**args),
-                    mimetype='multipart/x-mixed-replace; boundary=frame')
 
 # vim:sw=4:ts=4:et:

platypush/backend/http/static/css/dist/webpanel/plugins/camera.android.ipcam.css

@@ -1 +1 @@
-.camera{min-height:90%;margin-top:4%;overflow:auto;display:flex;flex-direction:column;align-items:center}.camera .camera-container{min-width:640px;min-height:480px;position:relative;background:#000;margin-bottom:1em}.camera .camera-container .frame,.camera .camera-container .no-frame{position:absolute;top:0;width:100%;height:100%}.camera .camera-container .frame{z-index:1}.camera .camera-container .no-frame{display:flex;background:rgba(0,0,0,0.1);color:#fff;align-items:center;justify-content:center;z-index:2}
+.camera{min-height:90%;margin-top:4%;overflow:auto;display:flex;flex-direction:column;align-items:center}.camera .camera-container{position:relative;background:#000;margin-bottom:1em}.camera .camera-container .frame,.camera .camera-container .no-frame{position:absolute;top:0;width:100%;height:100%}.camera .camera-container .frame{z-index:1}.camera .camera-container .no-frame{display:flex;background:rgba(0,0,0,0.1);color:#fff;align-items:center;justify-content:center;z-index:2}.camera .url{width:640px;display:flex;margin:1em}.camera .url .row{width:100%;display:flex;align-items:center}.camera .url .name{width:140px}.camera .url input{width:500px;font-weight:normal}.camera .params{margin-top:1em;padding:1em;width:640px;display:flex;flex-direction:column;border:1px solid #ccc;border-radius:1em}.camera .params label{font-weight:normal}.camera .params .head{display:flex;justify-content:center}.camera .params .head label{width:100%;display:flex;justify-content:right}.camera .params .head label .name{margin-right:1em}.camera .params .body{display:flex;flex-direction:column;margin:0 0 0 -1em}.camera .params .body .row{width:100%;display:flex;align-items:center;padding:.5em}.camera .params .body .row .name{width:30%}.camera .params .body .row input{width:70%}.camera .params .body .row:nth-child(even){background:#e4e4e4}.camera .params .body .row:hover{background:#def6ea}

platypush/backend/http/static/css/dist/webpanel/plugins/camera.ir.mlx90640.css

@@ -1 +1 @@
-.camera{min-height:90%;margin-top:4%;overflow:auto;display:flex;flex-direction:column;align-items:center}.camera .camera-container{min-width:640px;min-height:480px;position:relative;background:#000;margin-bottom:1em}.camera .camera-container .frame,.camera .camera-container .no-frame{position:absolute;top:0;width:100%;height:100%}.camera .camera-container .frame{z-index:1}.camera .camera-container .no-frame{display:flex;background:rgba(0,0,0,0.1);color:#fff;align-items:center;justify-content:center;z-index:2}
+.camera{min-height:90%;margin-top:4%;overflow:auto;display:flex;flex-direction:column;align-items:center}.camera .camera-container{position:relative;background:#000;margin-bottom:1em}.camera .camera-container .frame,.camera .camera-container .no-frame{position:absolute;top:0;width:100%;height:100%}.camera .camera-container .frame{z-index:1}.camera .camera-container .no-frame{display:flex;background:rgba(0,0,0,0.1);color:#fff;align-items:center;justify-content:center;z-index:2}.camera .url{width:640px;display:flex;margin:1em}.camera .url .row{width:100%;display:flex;align-items:center}.camera .url .name{width:140px}.camera .url input{width:500px;font-weight:normal}.camera .params{margin-top:1em;padding:1em;width:640px;display:flex;flex-direction:column;border:1px solid #ccc;border-radius:1em}.camera .params label{font-weight:normal}.camera .params .head{display:flex;justify-content:center}.camera .params .head label{width:100%;display:flex;justify-content:right}.camera .params .head label .name{margin-right:1em}.camera .params .body{display:flex;flex-direction:column;margin:0 0 0 -1em}.camera .params .body .row{width:100%;display:flex;align-items:center;padding:.5em}.camera .params .body .row .name{width:30%}.camera .params .body .row input{width:70%}.camera .params .body .row:nth-child(even){background:#e4e4e4}.camera .params .body .row:hover{background:#def6ea}

platypush/backend/http/static/css/dist/webpanel/plugins/camera.pi.css

@@ -1 +1 @@
-.camera{min-height:90%;margin-top:4%;overflow:auto;display:flex;flex-direction:column;align-items:center}.camera .camera-container{min-width:640px;min-height:480px;position:relative;background:#000;margin-bottom:1em}.camera .camera-container .frame,.camera .camera-container .no-frame{position:absolute;top:0;width:100%;height:100%}.camera .camera-container .frame{z-index:1}.camera .camera-container .no-frame{display:flex;background:rgba(0,0,0,0.1);color:#fff;align-items:center;justify-content:center;z-index:2}
+.camera{min-height:90%;margin-top:4%;overflow:auto;display:flex;flex-direction:column;align-items:center}.camera .camera-container{position:relative;background:#000;margin-bottom:1em}.camera .camera-container .frame,.camera .camera-container .no-frame{position:absolute;top:0;width:100%;height:100%}.camera .camera-container .frame{z-index:1}.camera .camera-container .no-frame{display:flex;background:rgba(0,0,0,0.1);color:#fff;align-items:center;justify-content:center;z-index:2}.camera .url{width:640px;display:flex;margin:1em}.camera .url .row{width:100%;display:flex;align-items:center}.camera .url .name{width:140px}.camera .url input{width:500px;font-weight:normal}.camera .params{margin-top:1em;padding:1em;width:640px;display:flex;flex-direction:column;border:1px solid #ccc;border-radius:1em}.camera .params label{font-weight:normal}.camera .params .head{display:flex;justify-content:center}.camera .params .head label{width:100%;display:flex;justify-content:right}.camera .params .head label .name{margin-right:1em}.camera .params .body{display:flex;flex-direction:column;margin:0 0 0 -1em}.camera .params .body .row{width:100%;display:flex;align-items:center;padding:.5em}.camera .params .body .row .name{width:30%}.camera .params .body .row input{width:70%}.camera .params .body .row:nth-child(even){background:#e4e4e4}.camera .params .body .row:hover{background:#def6ea}

platypush/backend/http/static/css/source/common/vars.scss

@@ -4,6 +4,7 @@ $default-bg-2: #f4f5f6 !default;
 $default-bg-3: #f1f3f2 !default;
 $default-bg-4: #edf0ee !default;
 $default-bg-5: #f8f8f8 !default;
+$default-bg-6: #e4e4e4 !default;
 $default-fg: black !default;
 $default-fg-2: #333333 !default;
 $default-fg-3: #888888 !default;

platypush/backend/http/static/css/source/webpanel/plugins/camera.android.ipcam

@@ -1 +1 @@
-camera
+camera.cv

platypush/backend/http/static/css/source/webpanel/plugins/camera.cv/index.scss

@@ -0,0 +1,116 @@
+@import 'common/vars';
+
+.camera {
+    min-height: 90%;
+    margin-top: 4%;
+    overflow: auto;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+
+    .camera-container {
+        position: relative;
+        background: black;
+        margin-bottom: 1em;
+
+        .frame, .no-frame {
+            position: absolute;
+            top: 0;
+            width: 100%;
+            height: 100%;
+        }
+
+        .frame {
+            z-index: 1;
+        }
+
+        .no-frame {
+            display: flex;
+            background: rgba(0, 0, 0, 0.1);
+            color: white;
+            align-items: center;
+            justify-content: center;
+            z-index: 2;
+        }
+    }
+
+    .url {
+        width: 640px;
+        display: flex;
+        margin: 1em;
+
+        .row {
+            width: 100%;
+            display: flex;
+            align-items: center;
+        }
+
+        .name {
+            width: 140px;
+        }
+
+        input {
+            width: 500px;
+            font-weight: normal;
+        }
+    }
+
+    .params {
+        margin-top: 1em;
+        padding: 1em;
+        width: 640px;
+        display: flex;
+        flex-direction: column;
+        border: $default-border-3;
+        border-radius: 1em;
+
+        label {
+            font-weight: normal;
+        }
+
+        .head {
+            display: flex;
+            justify-content: center;
+
+            label {
+                width: 100%;
+                display: flex;
+                justify-content: right;
+
+                .name {
+                    margin-right: 1em;
+                }
+            }
+        }
+
+        .body {
+            display: flex;
+            flex-direction: column;
+            margin: 0 0 0 -1em;
+
+            .row {
+                width: 100%;
+                display: flex;
+                align-items: center;
+                padding: 0.5em;
+
+                .name {
+                    width: 30%;
+                }
+
+                input {
+                    width: 70%;
+                }
+
+                &:nth-child(even) {
+                    background: $default-bg-6;
+                }
+
+                &:hover {
+                    background: $hover-bg;
+                }
+            }
+        }
+    }
+}
+

platypush/backend/http/static/css/source/webpanel/plugins/camera.ir.mlx90640

@@ -1 +1 @@
-camera
+camera.cv

platypush/backend/http/static/css/source/webpanel/plugins/camera.pi

@@ -1 +1 @@
-camera
+camera.cv

platypush/backend/http/static/css/source/webpanel/plugins/camera/index.scss

@@ -1,39 +0,0 @@
-@import 'common/vars';
-
-.camera {
-    min-height: 90%;
-    margin-top: 4%;
-    overflow: auto;
-    display: flex;
-    flex-direction: column;
-    align-items: center;
-
-    .camera-container {
-        min-width: 640px;
-        min-height: 480px;
-        position: relative;
-        background: black;
-        margin-bottom: 1em;
-
-        .frame, .no-frame {
-            position: absolute;
-            top: 0;
-            width: 100%;
-            height: 100%;
-        }
-
-        .frame {
-            z-index: 1;
-        }
-
-        .no-frame {
-            display: flex;
-            background: rgba(0, 0, 0, 0.1);
-            color: white;
-            align-items: center;
-            justify-content: center;
-            z-index: 2;
-        }
-    }
-}
-

platypush/backend/http/static/js/plugins/camera.cv/index.js

@@ -0,0 +1,15 @@
+Vue.component('camera-cv', {
+    template: '#tmpl-camera-cv',
+    mixins: [cameraMixin],
+
+    methods: {
+        startStreaming: function() {
+            this._startStreaming('cv');
+        },
+
+        capture: function() {
+            this._capture('cv');
+        },
+    },
+});
+

platypush/backend/http/static/js/plugins/camera.ir.mlx90640/index.js

@@ -1,59 +1,19 @@
 Vue.component('camera-ir-mlx90640', {
     template: '#tmpl-camera-ir-mlx90640',
-    props: ['config'],
+    mixins: [cameraMixin],
-
-    data: function() {
-        return {
-            bus: new Vue({}),
-            capturing: false,
-            rotate: this.config.rotate || 0,
-            grayscale: false,
-        };
-    },
 
     methods: {
-        startStreaming: async function() {
+        startStreaming: function() {
-            if (this.capturing)
+            this._startStreaming('ir.mlx90640');
-                return;
-
-            this.capturing = true;
-            this.$refs.frame.setAttribute('src', '/camera/ir/mlx90640/stream?rotate='
-                + this.rotate + '&grayscale=' + (this.grayscale ? 1 : 0) + '&t='
-                + (new Date()).getTime());
         },
 
-        stopStreaming: async function() {
+        capture: function() {
-            await request('camera.ir.mlx90640.stop');
+            this._capture('ir.mlx90640');
-            this.$refs.frame.removeAttribute('src');
-            this.capturing = false;
-        },
-
-        onRotationChange: function() {
-            this.rotate = parseInt(this.$refs.rotate.value);
-            const cameraContainer = this.$el.querySelector('.camera-container');
-
-            switch (this.rotate) {
-                case 0:
-                case 180:
-                    cameraContainer.style.width = '640px';
-                    cameraContainer.style.minWidth = '640px';
-                    cameraContainer.style.height = '480px';
-                    cameraContainer.style.minHeight = '480px';
-                    break;
-
-                case 90:
-                case 270:
-                    cameraContainer.style.width = '480px';
-                    cameraContainer.style.minWidth = '480px';
-                    cameraContainer.style.height = '640px';
-                    cameraContainer.style.minHeight = '640px';
-                    break;
-            }
         },
     },
 
     mounted: function() {
-        this.onRotationChange();
+        this.attrs.resolution = [32, 24];
-    },
+    }
 });
 

platypush/backend/http/static/js/plugins/camera/index.js

@@ -1,5 +1,4 @@
-Vue.component('camera', {
+var cameraMixin = {
-    template: '#tmpl-camera',
     props: ['config'],
 
     data: function() {
@@ -7,23 +6,57 @@ Vue.component('camera', {
             bus: new Vue({}),
             streaming: false,
             capturing: false,
+            showParams: false,
+            url: null,
+            attrs: {
+                resolution: this.config.resolution || [640, 480],
+                device: this.config.device,
+                horizontal_flip: this.config.horizontal_flip || 0,
+                vertical_flip: this.config.vertical_flip || 0,
+                rotate: this.config.rotate || 0,
+                scale_x: this.config.scale_x || 1.0,
+                scale_y: this.config.scale_y || 1.0,
+                fps: this.config.fps || 16.0,
+                grayscale: this.config.grayscale || 0,
+                stream_format: this.config.stream_format || 'mjpeg',
+            },
         };
     },
 
     computed: {
-        deviceId: function() {
+        params: function() {
-            return this.config.device_id || 0;
+            return {
+                resolution: this.attrs.resolution,
+                device: this.attrs.device != null && ('' + this.attrs.device).length > 0 ? this.attrs.device : null,
+                horizontal_flip: parseInt(0 + this.attrs.horizontal_flip),
+                vertical_flip: parseInt(0 + this.attrs.vertical_flip),
+                rotate: parseFloat(this.attrs.rotate),
+                scale_x: parseFloat(this.attrs.scale_x),
+                scale_y: parseFloat(this.attrs.scale_y),
+                fps: parseFloat(this.attrs.fps),
+                grayscale: parseInt(0 + this.attrs.grayscale),
+            };
+        },
+
+        window: function() {
+            return window;
         },
     },
 
     methods: {
-        startStreaming: function() {
+        getUrl: function(plugin, action) {
+            return '/camera/' + plugin + '/' + action + '?' +
+                Object.entries(this.params).filter(([k, v]) => v != null && ('' + v).length > 0)
+                    .map(([k, v]) => k + '=' + v).join('&');
+        },
+
+        _startStreaming: function(plugin) {
             if (this.streaming)
                 return;
 
             this.streaming = true;
             this.capturing = false;
-            this.$refs.frame.setAttribute('src', '/camera/' + this.deviceId + '/stream');
+            this.url = this.getUrl(plugin, 'video.' + this.attrs.stream_format);
         },
 
         stopStreaming: function() {
@@ -32,16 +65,16 @@ Vue.component('camera', {
 
             this.streaming = false;
             this.capturing = false;
-            this.$refs.frame.removeAttribute('src');
+            this.url = null;
         },
 
-        capture: function() {
+        _capture: function(plugin) {
             if (this.capturing)
                 return;
 
             this.streaming = false;
             this.capturing = true;
-            this.$refs.frame.setAttribute('src', '/camera/' + this.deviceId + '/frame?t=' + (new Date()).getTime());
+            this.url = this.getUrl(plugin, 'photo.jpg') + '&t=' + (new Date()).getTime();
         },
 
         onFrameLoaded: function(event) {
@@ -49,10 +82,22 @@ Vue.component('camera', {
                 this.capturing = false;
             }
         },
+
+        onDeviceChanged: function(event) {},
+        onFlipChanged: function(event) {},
+        onSizeChanged: function(event) {
+            const degToRad = (deg) => (deg * Math.PI)/180;
+            const rot = degToRad(this.params.rotate);
+            this.$refs.frameContainer.style.width = Math.round(this.params.scale_x * Math.abs(this.params.resolution[0] * Math.cos(rot) + this.params.resolution[1] * Math.sin(rot))) + 'px';
+            this.$refs.frameContainer.style.height = Math.round(this.params.scale_y * Math.abs(this.params.resolution[0] * Math.sin(rot) + this.params.resolution[1] * Math.cos(rot))) + 'px';
+        },
+
+        onFpsChanged: function(event) {},
+        onGrayscaleChanged: function(event) {},
     },
 
     mounted: function() {
         this.$refs.frame.addEventListener('load', this.onFrameLoaded);
+        this.onSizeChanged();
     },
-});
+};
-

platypush/backend/http/templates/nav.html

@@ -2,6 +2,7 @@
     with pluginIcons = {
         'camera': 'fas fa-camera',
         'camera.android.ipcam': 'fab fa-android',
+        'camera.cv': 'fas fa-camera',
         'camera.pi': 'fab fa-raspberry-pi',
         'camera.ir.mlx90640': 'fas fa-sun',
         'execute': 'fas fa-play',

platypush/backend/http/templates/plugins/camera.cv/index.html

@@ -0,0 +1,6 @@
+<script type="text/javascript" src="{{ url_for('static', filename='js/plugins/camera/index.js') }}"></script>
+
+<script type="text/x-template" id="tmpl-camera-cv">
+    {% include 'plugins/camera/index.html' %}
+</script>
+

platypush/backend/http/templates/plugins/camera.ir.mlx90640/index.html

@@ -1,31 +1,6 @@
+<script type="text/javascript" src="{{ url_for('static', filename='js/plugins/camera/index.js') }}"></script>
+
 <script type="text/x-template" id="tmpl-camera-ir-mlx90640">
-    <div class="camera">
+    {% include 'plugins/camera/index.html' %}
-        <div class="camera-container">
-            <div class="no-frame" v-if="!capturing">The camera is not active</div>
-            <img class="frame" ref="frame">
-        </div>
-
-        <div class="controls">
-            <button type="button" @click="startStreaming" v-if="!capturing">
-                <i class="fa fa-play"></i>&nbsp; Start streaming
-            </button>
-
-            <button type="button" @click="stopStreaming" v-else>
-                <i class="fa fa-stop"></i>&nbsp; Stop streaming
-            </button>
-
-            <select ref="rotate" @change="onRotationChange" :disabled="capturing">
-                <option value="0" :selected="rotate == 0">0 degrees</option>
-                <option value="90" :selected="rotate == 90">90 degrees</option>
-                <option value="180" :selected="rotate == 180">180 degrees</option>
-                <option value="270" :selected="rotate == 270">270 degrees</option>
-            </select>
-
-            <input type="checkbox" :checked="grayscale" :disabled="capturing"
-                @change="grayscale = $event.target.checked">
-                Grayscale
-            </input>
-        </div>
-    </div>
 </script>
 

platypush/backend/http/templates/plugins/camera/index.html

@@ -1,23 +1,90 @@
-<script type="text/x-template" id="tmpl-camera">
+<div class="camera">
-    <div class="camera">
+    <div class="camera-container" ref="frameContainer">
-        <div class="camera-container">
+        <div class="no-frame" v-if="!streaming && !capturing">The camera is not active</div>
-            <div class="no-frame" v-if="!streaming && !capturing">The camera is not active</div>
+        <img class="frame" :src="url" ref="frame">
-            <img class="frame" ref="frame">
+    </div>
+
+    <div class="controls">
+        <button type="button" @click="startStreaming" :disabled="capturing" v-if="!streaming">
+            <i class="fa fa-play"></i>&nbsp; Start streaming
+        </button>
+
+        <button type="button" @click="stopStreaming" :disabled="capturing" v-else>
+            <i class="fa fa-stop"></i>&nbsp; Stop streaming
+        </button>
+
+        <button type="button" @click="capture" :disabled="streaming || capturing">
+            <i class="fas fa-camera"></i>&nbsp; Take snapshot
+        </button>
+    </div>
+
+    <div class="url" v-if="url && url.length">
+        <label class="row">
+            <span class="name">Stream URL</span>
+            <input name="url" type="text" :value="window.location.protocol + '//' + window.location.host + url"
+                   disabled="disabled"/>
+        </label>
+    </div>
+
+    <div class="params">
+        <div class="head">
+            <label class="row">
+                <span class="name">Show parameters</span>
+                <input name="toggleParams" type="checkbox" v-model="showParams"/>
+            </label>
         </div>
 
-        <div class="controls">
+        <div class="body" :class="{ hidden: !showParams }">
-            <button type="button" @click="startStreaming" :disabled="capturing" v-if="!streaming">
+            <label class="row">
-                <i class="fa fa-play"></i>&nbsp; Start streaming
+                <span class="name">Device</span>
-            </button>
+                <input name="device" type="text" v-model="attrs.device" @change="onDeviceChanged"/>
+            </label>
 
-            <button type="button" @click="stopStreaming" :disabled="capturing" v-else>
+            <label class="row">
-                <i class="fa fa-stop"></i>&nbsp; Stop streaming
+                <span class="name">Width</span>
-            </button>
+                <input name="width" type="text" v-model="attrs.resolution[0]" @change="onSizeChanged"/>
+            </label>
 
-            <button type="button" @click="capture" :disabled="streaming || capturing">
+            <label class="row">
-                <i class="fas fa-camera"></i>&nbsp; Take snapshot
+                <span class="name">Height</span>
-            </button>
+                <input name="height" type="text" v-model="attrs.resolution[1]" @change="onSizeChanged"/>
+            </label>
+
+            <label class="row">
+                <span class="name">Horizontal Flip</span>
+                <input name="horizontal_flip" type="checkbox" v-model="attrs.horizontal_flip" @change="onFlipChanged"/>
+            </label>
+
+            <label class="row">
+                <span class="name">Vertical Flip</span>
+                <input name="vertical_flip" type="checkbox" v-model="attrs.vertical_flip" @change="onFlipChanged"/>
+            </label>
+
+            <label class="row">
+                <span class="name">Rotate</span>
+                <input name="rotate" type="text" v-model="attrs.rotate" @change="onSizeChanged"/>
+            </label>
+
+            <label class="row">
+                <span class="name">Scale-X</span>
+                <input name="scale_x" type="text" v-model="attrs.scale_x" @change="onSizeChanged"/>
+            </label>
+
+            <label class="row">
+                <span class="name">Scale-Y</span>
+                <input name="scale_y" type="text" v-model="attrs.scale_y" @change="onSizeChanged"/>
+            </label>
+
+            <label class="row">
+                <span class="name">Frames per second</span>
+                <input name="fps" type="text" v-model="attrs.fps" @change="onFpsChanged"/>
+            </label>
+
+            <label class="row">
+                <span class="name">Grayscale</span>
+                <input name="grayscale" type="checkbox" v-model="attrs.grayscale" @change="onGrayscaleChanged"/>
+            </label>
         </div>
     </div>
-</script>
+</div>
 

platypush/message/event/camera.py

@@ -13,8 +13,8 @@ class CameraRecordingStartedEvent(CameraEvent):
     Event triggered when a new recording starts
     """
 
-    def __init__(self, device_id, filename=None, *args, **kwargs):
+    def __init__(self, device, filename=None, *args, **kwargs):
-        super().__init__(*args, device_id=device_id, filename=filename, **kwargs)
+        super().__init__(*args, device=device, filename=filename, **kwargs)
 
 
 class CameraRecordingStoppedEvent(CameraEvent):
@@ -22,8 +22,8 @@ class CameraRecordingStoppedEvent(CameraEvent):
     Event triggered when a recording stops
     """
 
-    def __init__(self, device_id, *args, **kwargs):
+    def __init__(self, device, *args, **kwargs):
-        super().__init__(*args, device_id=device_id, **kwargs)
+        super().__init__(*args, device=device, **kwargs)
 
 
 class CameraVideoRenderedEvent(CameraEvent):

platypush/message/response/__init__.py

@@ -15,9 +15,7 @@ class Response(Message):
         :param origin: Origin
         :type origin: str
         :param output: Output
-        :type output: str
         :param errors: Errors
-        :type errors: list
         :param id: Message ID this response refers to
         :type id: str
         :param timestamp: Message timestamp

platypush/plugins/camera/cv.py

@@ -0,0 +1,79 @@
+from typing import Optional, Union
+
+from platypush.plugins.camera import CameraPlugin, Camera
+from platypush.plugins.camera.model.writer.cv import CvFileWriter
+
+
+class CameraCvPlugin(CameraPlugin):
+    """
+    Plugin to control generic cameras over OpenCV.
+
+    Requires:
+
+        * **opencv** (``pip install opencv-python``)
+        * **Pillow** (``pip install Pillow``)
+
+    """
+
+    def __init__(self, color_transform: Optional[str] = 'COLOR_BGR2RGB', video_type: str = 'XVID',
+                 video_writer: str = 'ffmpeg', **kwargs):
+        """
+        :param device: Device ID (0 for the first camera, 1 for the second etc.) or path (e.g. ``/dev/video0``).
+        :param video_type: Default video type to use when exporting captured frames to camera (default: 0, infers the
+            type from the video file extension). See
+            `here <https://docs.opencv.org/4.0.1/dd/d9e/classcv_1_1VideoWriter.html#afec93f94dc6c0b3e28f4dd153bc5a7f0>`_
+            for a reference on the supported types (e.g. 'MJPEG', 'XVID', 'H264', 'X264', 'AVC1' etc.)
+
+        :param color_transform: Color transformation to apply to the captured frames. See
+            https://docs.opencv.org/3.2.0/d7/d1b/group__imgproc__misc.html for a full list of supported color
+            transformations (default: "``COLOR_RGB2BGR``")
+
+        :param video_writer: Class to be used to write frames to a video file. Supported values:
+
+                - ``ffmpeg``: Use the FFmpeg writer (default, and usually more reliable - it requires ``ffmpeg``
+                    installed).
+                - ``cv``: Use the native OpenCV writer.
+
+            The FFmpeg video writer requires ``scikit-video`` (``pip install scikit-video``) and ``ffmpeg``.
+
+        :param kwargs: Extra arguments to be passed up to :class:`platypush.plugins.camera.CameraPlugin`.
+        """
+        super().__init__(color_transform=color_transform, video_type=video_type, **kwargs)
+        if video_writer == 'cv':
+            self._video_writer_class = CvFileWriter
+
+    def prepare_device(self, device: Camera):
+        import cv2
+
+        cam = cv2.VideoCapture(device.info.device)
+        if device.info.resolution and device.info.resolution[0]:
+            cam.set(cv2.CAP_PROP_FRAME_WIDTH, device.info.resolution[0])
+            cam.set(cv2.CAP_PROP_FRAME_HEIGHT, device.info.resolution[1])
+
+        return cam
+
+    def release_device(self, device: Camera):
+        if device.object:
+            device.object.release()
+            device.object = None
+
+    def capture_frame(self, camera: Camera, *args, **kwargs):
+        import cv2
+        from PIL import Image
+        ret, frame = camera.object.read()
+        assert ret, 'Cannot retrieve frame from {}'.format(camera.info.device)
+
+        color_transform = camera.info.color_transform
+        if isinstance(color_transform, str):
+            color_transform = getattr(cv2, color_transform or self.camera_info.color_transform)
+        if color_transform:
+            frame = cv2.cvtColor(frame, color_transform)
+
+        return Image.fromarray(frame)
+
+    @staticmethod
+    def transform_frame(frame, color_transform: Union[str, int]):
+        return frame
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/ir/mlx90640/__init__.py

@@ -1,12 +1,9 @@
-import base64
-import io
 import os
 import subprocess
-import threading
+from typing import Optional, Tuple
-import time
 
 from platypush.plugins import action
-from platypush.plugins.camera import CameraPlugin, StreamingOutput
+from platypush.plugins.camera import CameraPlugin, Camera
 
 
 class CameraIrMlx90640Plugin(CameraPlugin):
@@ -32,189 +29,65 @@ class CameraIrMlx90640Plugin(CameraPlugin):
 
         * **mlx90640-library** installation (see instructions above)
         * **PIL** image library (``pip install Pillow``)
+
     """
 
-    _img_size = (32, 24)
+    def __init__(self, rawrgb_path: Optional[str] = None, resolution: Tuple[int, int] = (32, 24),
-    _rotate_values = {}
+                 warmup_frames: Optional[int] = 5, **kwargs):
-
-    def __init__(self, fps=16, skip_frames=2, scale_factor=1, rotate=0, grayscale=False, rawrgb_path=None, **kwargs):
         """
-        :param fps: Frames per seconds (default: 16)
-        :param skip_frames: Number of frames to be skipped on sensor initialization/warmup (default: 2)
-        :param scale_factor: The camera outputs 24x32 pixels artifacts. Use scale_factor to scale them up to a larger
-            image (default: 1)
-        :param rotate: Rotation angle in degrees (default: 0)
-        :param grayscale: Save the image as grayscale - black pixels will be colder, white pixels warmer
-            (default: False = use false colors)
         :param rawrgb_path: Specify it if the rawrgb executable compiled from
             https://github.com/pimoroni/mlx90640-library is in another folder than
             `<directory of this file>/lib/examples`.
+        :param resolution: Device resolution (default: 32x24).
+        :param warmup_frames: Number of frames to be skipped on sensor initialization/warmup (default: 2).
+        :param kwargs: Extra parameters to be passed to :class:`platypush.plugins.camera.CameraPlugin`.
         """
-        from PIL import Image
+        super().__init__(device='mlx90640', resolution=resolution, warmup_frames=warmup_frames, **kwargs)
-        super().__init__(**kwargs)
-
-        self._rotate_values = {
-            90: Image.ROTATE_90,
-            180: Image.ROTATE_180,
-            270: Image.ROTATE_270,
-        }
 
         if not rawrgb_path:
             rawrgb_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'lib', 'examples', 'rawrgb')
         rawrgb_path = os.path.abspath(os.path.expanduser(rawrgb_path))
 
-        assert fps > 0
+        assert os.path.isfile(rawrgb_path),\
-        assert skip_frames >= 0
+            'rawrgb executable not found. Please follow the documentation of this plugin to build it'
-        assert os.path.isfile(rawrgb_path)
 
-        self.fps = fps
-        self.rotate = rotate
-        self.skip_frames = skip_frames
-        self.scale_factor = scale_factor
         self.rawrgb_path = rawrgb_path
-        self.grayscale = grayscale
         self._capture_proc = None
 
-    def _is_capture_proc_running(self):
+    def _is_capture_running(self):
         return self._capture_proc is not None and self._capture_proc.poll() is None
 
-    def _get_capture_proc(self, fps):
+    def prepare_device(self, device: Camera):
-        if not self._is_capture_proc_running():
+        if not self._is_capture_running():
-            fps = fps or self.fps
+            self._capture_proc = subprocess.Popen([self.rawrgb_path, '{}'.format(device.info.fps)],
-            self._capture_proc = subprocess.Popen([self.rawrgb_path, '{}'.format(fps)], stdin=subprocess.PIPE,
+                                                  stdin=subprocess.PIPE, stdout=subprocess.PIPE)
-                                                  stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 
         return self._capture_proc
 
-    def _raw_capture(self):
+    def release_device(self, device: Camera):
+        if not self._is_capture_running():
+            return
+
+        self._capture_proc.terminate()
+        self._capture_proc.kill()
+        self._capture_proc.wait()
+        self._capture_proc = None
+
+    def capture_frame(self, device: Camera, *args, **kwargs):
         from PIL import Image
 
-        camera = self._get_capture_proc(fps=self.fps)
+        camera = self.prepare_device(device)
-        size = self._img_size
+        frame = camera.stdout.read(device.info.resolution[0] * device.info.resolution[1] * 3)
+        return Image.frombytes('RGB', device.info.resolution, frame)
 
-        while self._is_capture_proc_running():
+    def to_grayscale(self, image):
-            frame = camera.stdout.read(size[0] * size[1] * 3)
-            image = Image.frombytes('RGB', size, frame)
-            self._output.write(frame)
-
-            if self.grayscale:
-                image = self._convert_to_grayscale(image)
-            if self.scale_factor != 1:
-                size = tuple(i * self.scale_factor for i in size)
-                image = image.resize(size, Image.ANTIALIAS)
-            if self.rotate:
-                rotate = self._rotate_values.get(int(self.rotate), 0)
-                image = image.transpose(rotate)
-
-            temp = io.BytesIO()
-            image.save(temp, format='jpeg')
-            self._output.write(temp.getvalue())
-
-    def __enter__(self):
-        self._output = StreamingOutput(raw=False)
-        self._capturing_thread = threading.Thread(target=self._raw_capture)
-        self._capturing_thread.start()
-
-    def __exit__(self, exc_type, exc_val, exc_tb):
-        self.stop()
-
-    # noinspection PyShadowingBuiltins
-    @action
-    def capture(self, output_file=None, frames=1, grayscale=None, fps=None, skip_frames=None, scale_factor=None,
-                rotate=None, format='jpeg'):
-        """
-        Capture one or multiple frames and return them as raw RGB
-
-        :param output_file: Can be either the path to a single image file or a format string
-            (e.g. 'snapshots/image-{:04d}') in case of multiple frames. If not set the function will return a list of
-            base64 encoded representations of the raw RGB frames, otherwise the list of captured files.
-        :type output_file: str
-
-        :param frames: Number of frames to be captured (default: 1). If None the capture process will proceed until
-            `stop` is called.
-        :type frames: int
-
-        :param grayscale: Override the default ``grayscale`` parameter.
-        :type grayscale: bool
-
-        :param fps: If set it overrides the fps parameter specified on the object (default: None)
-        :type fps: int
-
-        :param skip_frames: If set it overrides the skip_frames parameter specified on the object (default: None)
-        :type skip_frames: int
-
-        :param scale_factor: If set it overrides the scale_factor parameter specified on the object (default: None)
-        :type scale_factor: float
-
-        :param rotate: If set it overrides the rotate parameter specified on the object (default: None)
-        :type rotate: int
-
-        :param format: Output image format if output_file is not specified (default: jpeg).
-            It can be jpg, png, gif or any format supported by PIL
-        :type format: str
-
-        :returns: list[str]. Each item is a base64 encoded representation of a frame in the specified format if
-            output_file is not set, otherwise a list with the captured image files will be returned.
-        """
-
-        from PIL import Image
-        fps = self.fps if fps is None else fps
-        skip_frames = self.skip_frames if skip_frames is None else skip_frames
-        scale_factor = self.scale_factor if scale_factor is None else scale_factor
-        rotate = self._rotate_values.get(self.rotate if rotate is None else rotate, 0)
-        grayscale = self.grayscale if grayscale is None else grayscale
-
-        size = self._img_size
-        sleep_time = 1.0 / fps
-        captured_frames = []
-        n_captured_frames = 0
-        files = set()
-        camera = self._get_capture_proc(fps)
-
-        while (frames is not None and n_captured_frames < frames) or (
-                frames is None and self._is_capture_proc_running()):
-            frame = camera.stdout.read(size[0] * size[1] * 3)
-
-            if skip_frames > 0:
-                time.sleep(sleep_time)
-                skip_frames -= 1
-                continue
-
-            image = Image.frombytes('RGB', size, frame)
-
-            if grayscale:
-                image = self._convert_to_grayscale(image)
-            if scale_factor != 1:
-                size = tuple(i * scale_factor for i in size)
-                image = image.resize(size, Image.ANTIALIAS)
-            if rotate:
-                image = image.transpose(rotate)
-
-            if not output_file:
-                temp = io.BytesIO()
-                image.save(temp, format=format)
-                frame = base64.encodebytes(temp.getvalue()).decode()
-                captured_frames.append(frame)
-            else:
-                image_file = os.path.abspath(os.path.expanduser(output_file.format(n_captured_frames)))
-                image.save(image_file)
-                files.add(image_file)
-
-            n_captured_frames += 1
-            time.sleep(sleep_time)
-
-        self.stop()
-        return sorted([f for f in files]) if output_file else captured_frames
-
-    @staticmethod
-    def _convert_to_grayscale(image):
         from PIL import Image
         new_image = Image.new('L', image.size)
 
         for i in range(0, image.size[0]):
             for j in range(0, image.size[1]):
                 r, g, b = image.getpixel((i, j))
-                value = int(2.0 * r - 0.5 * g - 1.5 * b)
+                value = int(2.0 * r - 1.125 * g - 1.75 * b)
 
                 if value > 255:
                     value = 255
@@ -226,16 +99,11 @@ class CameraIrMlx90640Plugin(CameraPlugin):
         return new_image
 
     @action
-    def stop(self):
+    def capture(self, output_file=None, *args, **kwargs):
         """
-        Stop an ongoing capture session
+        Back-compatibility alias for :meth:`.capture_image`.
         """
-        if not self._is_capture_proc_running():
+        return self.capture_image(image_file=output_file, *args, **kwargs)
-            return
 
-        self._capture_proc.terminate()
-        self._capture_proc.kill()
-        self._capture_proc.wait()
-        self._capture_proc = None
 
 # vim:sw=4:ts=4:et:

platypush/plugins/camera/model/camera.py

@@ -0,0 +1,101 @@
+import math
+import threading
+from dataclasses import dataclass
+from typing import Optional, Union, Tuple, Set
+
+import numpy as np
+
+from platypush.plugins.camera.model.writer import StreamWriter, VideoWriter, FileVideoWriter
+from platypush.plugins.camera.model.writer.preview import PreviewWriter
+
+
+@dataclass
+class CameraInfo:
+    device: Optional[Union[int, str]]
+    resolution: Optional[Tuple[int, int]] = None
+    color_transform: Optional[str] = None
+    frames_dir: Optional[str] = None
+    rotate: Optional[float] = None
+    horizontal_flip: bool = False
+    vertical_flip: bool = False
+    scale_x: Optional[float] = None
+    scale_y: Optional[float] = None
+    warmup_frames: int = 0
+    warmup_seconds: float = 0.
+    capture_timeout: float = 20.0
+    fps: Optional[float] = None
+    grayscale: Optional[bool] = None
+    video_type: Optional[str] = None
+    stream_format: str = 'mjpeg'
+    listen_port: Optional[int] = None
+    bind_address: Optional[str] = None
+
+    def set(self, **kwargs):
+        for k, v in kwargs.items():
+            setattr(self, k, v)
+
+    def to_dict(self) -> dict:
+        return {
+            'device': self.device,
+            'color_transform': self.color_transform,
+            'frames_dir': self.frames_dir,
+            'rotate': self.rotate,
+            'horizontal_flip': self.horizontal_flip,
+            'vertical_flip': self.vertical_flip,
+            'scale_x': self.scale_x,
+            'scale_y': self.scale_y,
+            'warmup_frames': self.warmup_frames,
+            'warmup_seconds': self.warmup_seconds,
+            'capture_timeout': self.capture_timeout,
+            'fps': self.fps,
+            'grayscale': self.grayscale,
+            'resolution': list(self.resolution or ()),
+            'video_type': self.video_type,
+            'stream_format': self.stream_format,
+            'listen_port': self.listen_port,
+            'bind_address': self.bind_address,
+        }
+
+    def clone(self):
+        # noinspection PyArgumentList
+        return self.__class__(**self.to_dict())
+
+
+@dataclass
+class Camera:
+    info: CameraInfo
+    start_event: threading.Event = threading.Event()
+    stream_event: threading.Event = threading.Event()
+    capture_thread: Optional[threading.Thread] = None
+    stream_thread: Optional[threading.Thread] = None
+    object = None
+    stream: Optional[StreamWriter] = None
+    preview: Optional[PreviewWriter] = None
+    file_writer: Optional[FileVideoWriter] = None
+
+    def get_outputs(self) -> Set[VideoWriter]:
+        writers = set()
+        # if self.preview and self.preview.is_alive():
+        if self.preview and not self.preview.closed:
+            writers.add(self.preview)
+
+        if self.stream and not self.stream.closed:
+            writers.add(self.stream)
+
+        if self.file_writer and not self.file_writer.closed:
+            writers.add(self.file_writer)
+
+        return writers
+
+    def effective_resolution(self) -> Tuple[int, int]:
+        rot = (self.info.rotate or 0) * math.pi / 180
+        sin = math.sin(rot)
+        cos = math.cos(rot)
+        scale = np.array([[self.info.scale_x or 1., self.info.scale_y or 1.]])
+        resolution = np.array([[self.info.resolution[0], self.info.resolution[1]]])
+        rot_matrix = np.array([[sin, cos], [cos, sin]])
+        resolution = (scale * abs(np.cross(rot_matrix, resolution)))[0]
+        return int(round(resolution[0])), int(round(resolution[1]))
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/exceptions.py

@@ -0,0 +1,10 @@
+class CameraException(RuntimeError):
+    pass
+
+
+class CaptureSessionAlreadyRunningException(CameraException):
+    def __init__(self, device):
+        super().__init__('A capturing session on the device {} is already running'.format(device))
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/__init__.py

@@ -0,0 +1,135 @@
+import io
+import logging
+import os
+import threading
+import time
+
+from abc import ABC, abstractmethod
+from typing import Optional, IO
+
+from PIL.Image import Image
+
+logger = logging.getLogger('video-writer')
+
+
+class VideoWriter(ABC):
+    """
+    Generic class interface for handling frames-to-video operations.
+    """
+
+    mimetype: Optional[str] = None
+
+    def __init__(self, camera, plugin, *_, **__):
+        from platypush.plugins.camera import Camera, CameraPlugin
+        self.camera: Camera = camera
+        self.plugin: CameraPlugin = plugin
+        self.closed = False
+
+    @abstractmethod
+    def write(self, img: Image):
+        """
+        Write an image to the channel.
+
+        :param img: PIL Image instance.
+        """
+        raise NotImplementedError()
+
+    @abstractmethod
+    def close(self):
+        """
+        Close the channel.
+        """
+        if self.camera:
+            self.plugin.close_device(self.camera)
+        self.closed = True
+
+    def __enter__(self):
+        """
+        Context manager-based interface.
+        """
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        """
+        Context manager-based interface.
+        """
+        self.close()
+
+
+class FileVideoWriter(VideoWriter, ABC):
+    """
+    Abstract class to handle frames-to-video file operations.
+    """
+    def __init__(self, *args, video_file: str, **kwargs):
+        VideoWriter.__init__(self, *args, **kwargs)
+        self.video_file = os.path.abspath(os.path.expanduser(video_file))
+
+
+class StreamWriter(VideoWriter, ABC):
+    """
+    Abstract class for camera streaming operations.
+    """
+    def __init__(self, *args, sock: Optional[IO] = None, **kwargs):
+        VideoWriter.__init__(self, *args, **kwargs)
+        self.frame: Optional[bytes] = None
+        self.frame_time: Optional[float] = None
+        self.buffer = io.BytesIO()
+        self.ready = threading.Condition()
+        self.sock = sock
+
+    def write(self, image: Image):
+        data = self.encode(image)
+        with self.ready:
+            if self.buffer.closed:
+                return
+
+            self.buffer.truncate()
+            self.frame = self.buffer.getvalue()
+            self.frame_time = time.time()
+            self.ready.notify_all()
+
+        self._sock_send(self.frame)
+        if not self.buffer.closed:
+            self.buffer.seek(0)
+            return self.buffer.write(data)
+
+    def _sock_send(self, data):
+        if self.sock and data:
+            try:
+                self.sock.write(data)
+            except ConnectionError:
+                logger.warning('Client connection closed')
+                self.close()
+
+    @abstractmethod
+    def encode(self, image: Image) -> bytes:
+        """
+        Encode an image before sending it to the channel.
+
+        :param image: PIL Image object.
+        :return: The bytes-encoded representation of the frame.
+        """
+        raise NotImplementedError()
+
+    def close(self):
+        self.buffer.close()
+        if self.sock:
+            # noinspection PyBroadException
+            try:
+                self.sock.close()
+            except:
+                pass
+
+        super().close()
+
+    @staticmethod
+    def get_class_by_name(name: str):
+        from platypush.plugins.camera.model.writer.index import StreamHandlers
+        name = name.upper()
+        assert hasattr(StreamHandlers, name), 'No such stream handler: {}. Supported types: {}'.format(
+            name, [hndl.name for hndl in list(StreamHandlers)])
+
+        return getattr(StreamHandlers, name).value
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/cv.py

@@ -0,0 +1,46 @@
+import numpy as np
+from PIL.Image import Image as ImageType
+
+from platypush.plugins.camera.model.writer import FileVideoWriter
+
+
+class CvFileWriter(FileVideoWriter):
+    """
+    Write camera frames to a file using OpenCV.
+    """
+    def __init__(self, *args, **kwargs):
+        import cv2
+        super(CvFileWriter, self).__init__(*args, **kwargs)
+
+        video_type = cv2.VideoWriter_fourcc(*(self.camera.info.video_type or 'xvid').upper())
+        resolution = (
+            int(self.camera.info.resolution[0] * (self.camera.info.scale_x or 1.)),
+            int(self.camera.info.resolution[1] * (self.camera.info.scale_y or 1.)),
+        )
+
+        self.writer = cv2.VideoWriter(self.video_file, video_type, self.camera.info.fps, resolution, False)
+
+    def write(self, img):
+        if not self.writer:
+            return
+
+        # noinspection PyBroadException
+        try:
+            if isinstance(img, ImageType):
+                # noinspection PyTypeChecker
+                img = np.array(img)
+        except:
+            pass
+
+        self.writer.write(img)
+
+    def close(self):
+        if not self.writer:
+            return
+
+        self.writer.release()
+        self.writer = None
+        super().close()
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/ffmpeg.py

@@ -0,0 +1,183 @@
+import logging
+import subprocess
+import threading
+import time
+
+from abc import ABC
+from typing import Optional, List
+
+from PIL.Image import Image
+
+from platypush.plugins.camera.model.writer import VideoWriter, FileVideoWriter, StreamWriter
+
+
+logger = logging.getLogger('ffmpeg-writer')
+
+
+class FFmpegWriter(VideoWriter, ABC):
+    """
+    Generic FFmpeg encoder for camera frames.
+    """
+
+    def __init__(self, *args, input_file: str = '-', input_format: str = 'rawvideo', input_codec: Optional[str] = None,
+                 output_file: str = '-', output_format: Optional[str] = None, output_codec: Optional[str] = None,
+                 pix_fmt: Optional[str] = None, output_opts: Optional[List[str]] = None, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        self.input_file = input_file
+        self.input_format = input_format
+        self.input_codec = input_codec
+        self.output_file = output_file
+        self.output_format = output_format
+        self.output_codec = output_codec
+        self.width, self.height = self.camera.effective_resolution()
+        self.pix_fmt = pix_fmt
+        self.output_opts = output_opts or []
+
+        logger.info('Starting FFmpeg. Command: {}'.format(' '.join(self.ffmpeg_args)))
+        self.ffmpeg = subprocess.Popen(self.ffmpeg_args, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+
+    @property
+    def ffmpeg_args(self):
+        return ['ffmpeg', '-y',
+                '-f', self.input_format,
+                *(('-vcodec', self.input_codec) if self.input_codec else ()),
+                *(('-pix_fmt', self.pix_fmt) if self.pix_fmt else ()),
+                '-s', '{}x{}'.format(self.width, self.height),
+                '-r', str(self.camera.info.fps),
+                '-i', self.input_file,
+                *(('-f', self.output_format) if self.output_format else ()),
+                *self.output_opts,
+                *(('-vcodec', self.output_codec) if self.output_codec else ()),
+                self.output_file]
+
+    def is_closed(self):
+        return self.closed or not self.ffmpeg or self.ffmpeg.poll() is not None
+
+    def write(self, image: Image):
+        if self.is_closed():
+            return
+
+        try:
+            self.ffmpeg.stdin.write(image.convert('RGB').tobytes())
+        except Exception as e:
+            logger.warning('FFmpeg send error: {}'.format(str(e)))
+            self.close()
+
+    def close(self):
+        if not self.is_closed():
+            if self.ffmpeg and self.ffmpeg.stdin:
+                try:
+                    self.ffmpeg.stdin.close()
+                except (IOError, OSError):
+                    pass
+
+            if self.ffmpeg:
+                self.ffmpeg.terminate()
+                try:
+                    self.ffmpeg.wait(timeout=5.0)
+                except subprocess.TimeoutExpired:
+                    logger.warning('FFmpeg has not returned - killing it')
+                    self.ffmpeg.kill()
+
+            if self.ffmpeg and self.ffmpeg.stdout:
+                try:
+                    self.ffmpeg.stdout.close()
+                except (IOError, OSError):
+                    pass
+
+        self.ffmpeg = None
+        super().close()
+
+
+class FFmpegFileWriter(FileVideoWriter, FFmpegWriter):
+    """
+    Write camera frames to a file using FFmpeg.
+    """
+
+    def __init__(self, *args, video_file: str, **kwargs):
+        FileVideoWriter.__init__(self, *args, video_file=video_file, **kwargs)
+        FFmpegWriter.__init__(self, *args, pix_fmt='rgb24', output_file=self.video_file, **kwargs)
+
+
+class FFmpegStreamWriter(StreamWriter, FFmpegWriter, ABC):
+    """
+    Stream camera frames using FFmpeg.
+    """
+
+    def __init__(self, *args, output_format: str, **kwargs):
+        StreamWriter.__init__(self, *args, **kwargs)
+        FFmpegWriter.__init__(self, *args, pix_fmt='rgb24', output_format=output_format,
+                              output_opts=[
+                                  '-tune', '-zerolatency', '-preset', 'superfast', '-trellis', '0',
+                                  '-fflags', 'nobuffer'], **kwargs)
+        self._reader = threading.Thread(target=self._reader_thread)
+        self._reader.start()
+
+    def encode(self, image: Image) -> bytes:
+        return image.convert('RGB').tobytes()
+
+    def _reader_thread(self):
+        start_time = time.time()
+
+        while not self.is_closed():
+            try:
+                data = self.ffmpeg.stdout.read(1 << 15)
+            except Exception as e:
+                logger.warning('FFmpeg reader error: {}'.format(str(e)))
+                break
+
+            if not data:
+                continue
+
+            if self.frame is None:
+                latency = time.time() - start_time
+                logger.info('FFmpeg stream latency: {} secs'.format(latency))
+
+            with self.ready:
+                self.frame = data
+                self.frame_time = time.time()
+                self.ready.notify_all()
+
+            self._sock_send(self.frame)
+
+    def write(self, image: Image):
+        if self.is_closed():
+            return
+
+        data = self.encode(image)
+        try:
+            self.ffmpeg.stdin.write(data)
+        except Exception as e:
+            logger.warning('FFmpeg send error: {}'.format(str(e)))
+            self.close()
+
+    def close(self):
+        super().close()
+        if self._reader and self._reader.is_alive() and threading.get_ident() != self._reader.ident:
+            self._reader.join(timeout=5.0)
+            self._reader = None
+
+
+class MKVStreamWriter(FFmpegStreamWriter):
+    mimetype = 'video/webm'
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, output_format='matroska', **kwargs)
+
+
+class H264StreamWriter(FFmpegStreamWriter):
+    mimetype = 'video/h264'
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, output_format='h264', **kwargs)
+
+
+class H265StreamWriter(FFmpegStreamWriter):
+    mimetype = 'video/h265'
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, output_format='h265', **kwargs)
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/image.py

@@ -0,0 +1,67 @@
+import io
+from abc import ABC
+
+from PIL.Image import Image
+
+from platypush.plugins.camera.model.writer import StreamWriter
+
+
+class ImageStreamWriter(StreamWriter, ABC):
+    """
+    Write camera frames to a stream as single JPEG items.
+    """
+
+    @staticmethod
+    def _encode(image: Image, encoding: str, **kwargs) -> bytes:
+        with io.BytesIO() as buf:
+            image.save(buf, format=encoding, **kwargs)
+            return buf.getvalue()
+
+
+class JPEGStreamWriter(ImageStreamWriter):
+    """
+    Write camera frames to a stream as single JPEG items.
+    """
+    mimetype = 'image/jpeg'
+
+    def __init__(self, *args, quality: int = 90, **kwargs):
+        super().__init__(*args, **kwargs)
+        assert 0 < quality <= 100, 'JPEG quality should be between 0 and 100'
+        self.quality = quality
+
+    def encode(self, image: Image) -> bytes:
+        return self._encode(image, 'jpeg', quality=self.quality)
+
+
+class PNGStreamWriter(ImageStreamWriter):
+    """
+    Write camera frames to a stream as single PNG items.
+    """
+    mimetype = 'image/png'
+
+    def encode(self, image: Image) -> bytes:
+        return self._encode(image, 'png')
+
+
+class BMPStreamWriter(ImageStreamWriter):
+    """
+    Write camera frames to a stream as single BMP items.
+    """
+    mimetype = 'image/bmp'
+
+    def encode(self, image: Image) -> bytes:
+        return self._encode(image, 'bmp')
+
+
+class MJPEGStreamWriter(JPEGStreamWriter):
+    """
+    Write camera frames to a stream as an MJPEG feed.
+    """
+    mimetype = 'multipart/x-mixed-replace; boundary=frame'
+
+    def encode(self, image: Image) -> bytes:
+        return (b'--frame\r\n'
+                b'Content-Type: image/jpeg\r\n\r\n' + super().encode(image) + b'\r\n')
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/index.py

@@ -0,0 +1,22 @@
+from enum import Enum
+
+from platypush.plugins.camera.model.writer.ffmpeg import MKVStreamWriter, H264StreamWriter, H265StreamWriter
+from platypush.plugins.camera.model.writer.image import JPEGStreamWriter, PNGStreamWriter, BMPStreamWriter, \
+    MJPEGStreamWriter
+
+
+class StreamHandlers(Enum):
+    JPG = JPEGStreamWriter
+    JPEG = JPEGStreamWriter
+    PNG = PNGStreamWriter
+    BMP = BMPStreamWriter
+    MJPEG = MJPEGStreamWriter
+    MJPG = MJPEGStreamWriter
+    MKV = MKVStreamWriter
+    WEBM = MKVStreamWriter
+    H264 = H264StreamWriter
+    H265 = H265StreamWriter
+    MP4 = H264StreamWriter
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/preview/__init__.py

@@ -0,0 +1,31 @@
+import logging
+
+from abc import ABC
+
+from platypush.plugins.camera.model.writer import VideoWriter
+
+logger = logging.getLogger('cam-preview')
+
+
+class PreviewWriter(VideoWriter, ABC):
+    """
+    Abstract class for camera previews.
+    """
+
+
+class PreviewWriterFactory:
+    @staticmethod
+    def get(*args, **kwargs) -> PreviewWriter:
+        try:
+            import wx
+            # noinspection PyUnresolvedReferences
+            from platypush.plugins.camera.model.writer.preview.wx import WxPreviewWriter
+            return WxPreviewWriter(*args, **kwargs)
+        except ImportError:
+            logger.warning('wxPython not available, using ffplay as a fallback for camera previews')
+
+        from platypush.plugins.camera.model.writer.preview.ffplay import FFplayPreviewWriter
+        return FFplayPreviewWriter(*args, **kwargs)
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/preview/ffplay.py

@@ -0,0 +1,47 @@
+import logging
+import subprocess
+import threading
+
+from platypush.plugins.camera.model.writer.image import MJPEGStreamWriter
+from platypush.plugins.camera.model.writer.preview import PreviewWriter
+
+logger = logging.getLogger('cam-preview')
+
+
+class FFplayPreviewWriter(PreviewWriter, MJPEGStreamWriter):
+    """
+    General class for managing previews from camera devices or generic sources of images over ffplay.
+    """
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.ffplay = subprocess.Popen(['ffplay', '-'], stdin=subprocess.PIPE)
+        self._preview_thread = threading.Thread(target=self._ffplay_thread)
+        self._preview_thread.start()
+
+    def _ffplay_thread(self):
+        while not self.closed and self.ffplay.poll() is None:
+            with self.ready:
+                self.ready.wait(1.)
+                if not self.frame:
+                    continue
+
+                try:
+                    self.ffplay.stdin.write(self.frame)
+                except Exception as e:
+                    logger.warning('ffplay write error: {}'.format(str(e)))
+                    self.close()
+                    break
+
+    def close(self):
+        if self.ffplay and self.ffplay.poll() is None:
+            self.ffplay.terminate()
+
+        self.camera = None
+        super().close()
+        if self._preview_thread and self._preview_thread.is_alive() and \
+                threading.get_ident() != self._preview_thread.ident:
+            self._preview_thread.join(timeout=5.0)
+            self._preview_thread = None
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/preview/ui.py

@@ -0,0 +1,68 @@
+from queue import Empty
+import wx
+
+from platypush.plugins.camera.model.writer.preview import PreviewWriter
+
+
+class Panel(wx.Panel):
+    def __init__(self, parent, process, width: int, height: int):
+        import wx
+        super().__init__(parent, -1)
+
+        self.process: PreviewWriter = process
+        self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM)
+        self.SetSize(width, height)
+        self.Bind(wx.EVT_PAINT, self.on_paint)
+        self.update()
+
+    @staticmethod
+    def img_to_bitmap(image) -> wx.Bitmap:
+        import wx
+        return wx.Bitmap.FromBuffer(image.width, image.height, image.tobytes())
+
+    def get_bitmap(self):
+        try:
+            return self.process.bitmap_queue.get(block=True, timeout=1.0)
+        except Empty:
+            return None
+
+    def update(self):
+        import wx
+        self.Refresh()
+        self.Update()
+        wx.CallLater(15, self.update)
+
+    def create_bitmap(self):
+        image = self.get_bitmap()
+        if image is None:
+            return
+
+        return self.img_to_bitmap(image)
+
+    def on_paint(self, *_, **__):
+        import wx
+        bitmap = self.create_bitmap()
+        if not bitmap:
+            return
+
+        dc = wx.AutoBufferedPaintDC(self)
+        dc.DrawBitmap(bitmap, 0, 0)
+
+
+class Frame(wx.Frame):
+    def __init__(self, process):
+        import wx
+        style = wx.DEFAULT_FRAME_STYLE & ~wx.RESIZE_BORDER & ~wx.MAXIMIZE_BOX
+        self.process = process
+        image = self.process.bitmap_queue.get()
+
+        super().__init__(None, -1, process.camera.info.device or 'Camera Preview', style=style)
+        self.Bind(wx.EVT_WINDOW_DESTROY, self.on_close)
+        self.panel = Panel(self, process, width=image.width, height=image.height)
+        self.Fit()
+
+    def on_close(self, *_, **__):
+        self.process.close()
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/preview/wx/__init__.py

@@ -0,0 +1,53 @@
+import logging
+from multiprocessing import Process, Queue, Event
+
+from platypush.plugins.camera.model.writer import VideoWriter
+from platypush.plugins.camera.model.writer.preview import PreviewWriter
+
+logger = logging.getLogger('cam-preview')
+
+
+class WxPreviewWriter(PreviewWriter, Process):
+    """
+    General class for managing previews from camera devices or sources of images.
+    """
+
+    def __init__(self, camera, plugin, *args, **kwargs):
+        Process.__init__(self, *args, **kwargs)
+        VideoWriter.__init__(self, camera=camera, plugin=plugin)
+        self.app = None
+        self.bitmap_queue = Queue()
+        self.stopped_event = Event()
+
+    def run(self) -> None:
+        import wx
+        from platypush.plugins.camera.model.writer.preview.wx.ui import Frame
+
+        self.app = wx.App()
+        frame = Frame(self)
+        frame.Center()
+        frame.Show()
+        self.app.MainLoop()
+
+    def close(self):
+        if not self.app:
+            return
+
+        self.app.ExitMainLoop()
+        self.app = None
+        self.camera.preview = None
+        self.bitmap_queue.close()
+        self.bitmap_queue = None
+        self.stopped_event.set()
+
+    def write(self, image):
+        if self.stopped_event.is_set():
+            return
+
+        try:
+            self.bitmap_queue.put(image)
+        except Exception as e:
+            logger.warning('Could not add an image to the preview queue: {}'.format(str(e)))
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/model/writer/preview/wx/ui.py

@@ -0,0 +1,68 @@
+from queue import Empty
+import wx
+
+from platypush.plugins.camera.model.writer.preview.wx import WxPreviewWriter
+
+
+class Panel(wx.Panel):
+    def __init__(self, parent, process, width: int, height: int):
+        import wx
+        super().__init__(parent, -1)
+
+        self.process: WxPreviewWriter = process
+        self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM)
+        self.SetSize(width, height)
+        self.Bind(wx.EVT_PAINT, self.on_paint)
+        self.update()
+
+    @staticmethod
+    def img_to_bitmap(image) -> wx.Bitmap:
+        import wx
+        return wx.Bitmap.FromBuffer(image.width, image.height, image.tobytes())
+
+    def get_bitmap(self):
+        try:
+            return self.process.bitmap_queue.get(block=True, timeout=1.0)
+        except Empty:
+            return None
+
+    def update(self):
+        import wx
+        self.Refresh()
+        self.Update()
+        wx.CallLater(15, self.update)
+
+    def create_bitmap(self):
+        image = self.get_bitmap()
+        if image is None:
+            return
+
+        return self.img_to_bitmap(image)
+
+    def on_paint(self, *_, **__):
+        import wx
+        bitmap = self.create_bitmap()
+        if not bitmap:
+            return
+
+        dc = wx.AutoBufferedPaintDC(self)
+        dc.DrawBitmap(bitmap, 0, 0)
+
+
+class Frame(wx.Frame):
+    def __init__(self, process):
+        import wx
+        style = wx.DEFAULT_FRAME_STYLE & ~wx.RESIZE_BORDER & ~wx.MAXIMIZE_BOX
+        self.process = process
+        image = self.process.bitmap_queue.get()
+
+        super().__init__(None, -1, process.camera.info.device or 'Camera Preview', style=style)
+        self.Bind(wx.EVT_WINDOW_DESTROY, self.on_close)
+        self.panel = Panel(self, process, width=image.width, height=image.height)
+        self.Fit()
+
+    def on_close(self, *_, **__):
+        self.process.close()
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/pi.py

@@ -1,579 +0,0 @@
-"""
-.. moduleauthor:: Fabio Manganiello <blacklight86@gmail.com>
-"""
-
-import os
-import socket
-import threading
-import time
-
-from typing import Optional
-
-from platypush.plugins import action
-from platypush.plugins.camera import CameraPlugin, StreamingOutput
-
-
-class CameraPiPlugin(CameraPlugin):
-    """
-    Plugin to control a Pi camera.
-
-    Requires:
-
-        * **picamera** (``pip install picamera``)
-        * **numpy** (``pip install numpy``)
-
-    """
-
-    _default_resolution = (800, 600)
-    _default_listen_port = 5000
-
-    def __init__(self, resolution=(_default_resolution[0], _default_resolution[1]), framerate=24,
-                 hflip=False, vflip=False, sharpness=0, contrast=0, brightness=50, video_stabilization=False, iso=0,
-                 exposure_compensation=0, exposure_mode='auto', meter_mode='average', awb_mode='auto',
-                 image_effect='none', color_effects=None, rotation=0, zoom=(0.0, 0.0, 1.0, 1.0),
-                 listen_port: int = _default_listen_port, **kwargs):
-        """
-        See https://www.raspberrypi.org/documentation/usage/camera/python/README.md
-        for a detailed reference about the Pi camera options.
-
-        :param listen_port: Default port that will be used for streaming the feed (default: 5000)
-        """
-        super().__init__(**kwargs)
-
-        self.camera_args = {
-            'resolution': tuple(resolution),
-            'framerate': framerate,
-            'hflip': hflip,
-            'vflip': vflip,
-            'sharpness': sharpness,
-            'contrast': contrast,
-            'brightness': brightness,
-            'video_stabilization': video_stabilization,
-            'iso': iso,
-            'exposure_compensation': exposure_compensation,
-            'exposure_mode': exposure_mode,
-            'meter_mode': meter_mode,
-            'awb_mode': awb_mode,
-            'image_effect': image_effect,
-            'color_effects': color_effects,
-            'rotation': rotation,
-            'zoom': tuple(zoom),
-        }
-
-        self._camera = None
-        self.listen_port = listen_port
-
-        self._time_lapse_thread = None
-        self._recording_thread = None
-        self._streaming_thread = None
-        self._capturing_thread = None
-        self._time_lapse_stop_condition = threading.Condition()
-        self._recording_stop_condition = threading.Condition()
-        self._can_stream = False
-        self._can_capture = False
-
-    # noinspection PyUnresolvedReferences,PyPackageRequirements
-    def _get_camera(self, **opts):
-        if self._camera and not self._camera.closed:
-            return self._camera
-
-        import picamera
-        self._camera = picamera.PiCamera()
-
-        for (attr, value) in self.camera_args.items():
-            setattr(self._camera, attr, value)
-        for (attr, value) in opts.items():
-            setattr(self._camera, attr, value)
-
-        return self._camera
-
-    @action
-    def close(self):
-        """
-        Close an active connection to the camera.
-        """
-        import picamera
-
-        if self._output and self._camera:
-            try:
-                self._camera.stop_recording()
-            except picamera.PiCameraNotRecording:
-                pass
-
-        if self._camera and not self._camera.closed:
-            try:
-                self._camera.close()
-            except picamera.PiCameraClosed:
-                pass
-
-        self._camera = None
-
-    @action
-    def start_preview(self, **opts):
-        """
-        Start camera preview.
-
-        :param opts: Extra options to pass to the camera (see
-            https://www.raspberrypi.org/documentation/usage/camera/python/README.md)
-        """
-        camera = self._get_camera(**opts)
-        camera.start_preview()
-
-    @action
-    def stop_preview(self):
-        """
-        Stop camera preview.
-        """
-        camera = self._get_camera()
-        try:
-            camera.stop_preview()
-        except Exception as e:
-            self.logger.warning(str(e))
-
-    @action
-    def take_picture(self, image_file, preview=False, warmup_time=2, resize=None, close=True, **opts):
-        """
-        Take a picture.
-
-        :param image_file: Path where the output image will be stored.
-        :type image_file: str
-
-        :param preview: Show a preview before taking the picture (default: False)
-        :type preview: bool
-
-        :param warmup_time: Time before taking the picture (default: 2 seconds)
-        :type warmup_time: float
-
-        :param resize: Set if you want to resize the picture to a new format
-        :type resize: list or tuple (with two elements)
-
-        :param opts: Extra options to pass to the camera (see
-            https://www.raspberrypi.org/documentation/usage/camera/python/README.md)
-
-        :param close: If True (default) close the connection to the camera after capturing,
-            otherwise keep the connection open (e.g. if you want to take a sequence of pictures).
-            If you set close=False you should remember to call ``close`` when you don't need
-            the connection anymore.
-
-        :return: dict::
-
-            {"image_file": path_to_the_image}
-
-        """
-
-        camera = None
-
-        try:
-            camera = self._get_camera(**opts)
-            image_file = os.path.abspath(os.path.expanduser(image_file))
-
-            if preview:
-                camera.start_preview()
-
-            if warmup_time:
-                time.sleep(warmup_time)
-
-            capture_opts = {}
-            if resize:
-                capture_opts['resize'] = tuple(resize)
-
-            camera.capture(image_file, **capture_opts)
-
-            if preview:
-                camera.stop_preview()
-
-            return {'image_file': image_file}
-        finally:
-            if camera and close:
-                self.close()
-
-    def _raw_capture(self):
-        import numpy as np
-        resolution = self.camera_args['resolution']
-        camera = self._get_camera()
-
-        while self._can_capture:
-            shape = (resolution[1] + (resolution[1]%16),
-                     resolution[0] + (resolution[0]%32),
-                     3)
-
-            frame = np.empty(shape, dtype=np.uint8)
-            camera.capture(frame, 'bgr')
-            frame.reshape((shape[0], shape[1], 3))
-            self._output.write(frame)
-
-    def __enter__(self):
-        camera = self._get_camera()
-        self._output = StreamingOutput(raw=self.stream_raw_frames)
-        self._can_capture = True
-
-        if self.stream_raw_frames:
-            self._capturing_thread = threading.Thread(target=self._raw_capture)
-            self._capturing_thread.start()
-        else:
-            camera.start_recording(self._output, format='mjpeg')
-
-    def __exit__(self, exc_type, exc_val, exc_tb):
-        self._can_capture = False
-        if self._capturing_thread:
-            self._capturing_thread.join()
-            self._capturing_thread = None
-
-        self.close()
-
-    @action
-    def capture_sequence(self, n_images, directory, name_format='image_%04d.jpg', preview=False, warmup_time=2,
-                         resize=None, **opts):
-        """
-        Capture a sequence of images
-
-        :param n_images: Number of images to capture
-        :type n_images: int
-
-        :param directory: Path where the images will be stored
-        :type directory: str
-
-        :param name_format: Format for the name of the stored images. Use %d or any other format string for representing
-            the image index (default: image_%04d.jpg)
-        :type name_format: str
-
-        :param preview: Show a preview before taking the picture (default: False)
-        :type preview: bool
-
-        :param warmup_time: Time before taking the picture (default: 2 seconds)
-        :type warmup_time: float
-
-        :param resize: Set if you want to resize the picture to a new format
-        :type resize: list or tuple (with two elements)
-
-        :param opts: Extra options to pass to the camera (see
-            https://www.raspberrypi.org/documentation/usage/camera/python/README.md)
-
-        :return: dict::
-
-            {"image_files": [list of captured images]}
-
-        """
-
-        try:
-            camera = self._get_camera(**opts)
-            directory = os.path.abspath(os.path.expanduser(directory))
-
-            if preview:
-                camera.start_preview()
-
-            if warmup_time:
-                time.sleep(warmup_time)
-                camera.exposure_mode = 'off'
-
-            camera.shutter_speed = camera.exposure_speed
-            g = camera.awb_gains
-            camera.awb_mode = 'off'
-            camera.awb_gains = g
-            capture_opts = {}
-
-            if resize:
-                capture_opts['resize'] = tuple(resize)
-
-            images = [os.path.join(directory, name_format % (i+1)) for i in range(0, n_images)]
-            camera.capture_sequence(images, **capture_opts)
-
-            if preview:
-                camera.stop_preview()
-
-            return {'image_files': images}
-        finally:
-            self.close()
-
-    @action
-    def start_time_lapse(self, directory, n_images=None, interval=0, warmup_time=2,
-                         resize=None, **opts):
-        """
-        Start a time lapse capture
-
-        :param directory: Path where the images will be stored
-        :type directory: str
-
-        :param n_images: Number of images to capture (default: None, capture until stop_time_lapse)
-        :type n_images: int
-
-        :param interval: Interval in seconds between two pictures (default: 0)
-        :type interval: float
-
-        :param warmup_time: Time before taking the picture (default: 2 seconds)
-        :type warmup_time: float
-
-        :param resize: Set if you want to resize the picture to a new format
-        :type resize: list or tuple (with two elements)
-
-        :param opts: Extra options to pass to the camera (see
-            https://www.raspberrypi.org/documentation/usage/camera/python/README.md)
-        """
-
-        if self._time_lapse_thread:
-            return None, 'A time lapse thread is already running'
-
-        camera = self._get_camera(**opts)
-        directory = os.path.abspath(os.path.expanduser(directory))
-
-        if warmup_time:
-            time.sleep(warmup_time)
-
-        capture_opts = {}
-        if resize:
-            capture_opts['resize'] = tuple(resize)
-
-        def capture_thread():
-            try:
-                self.logger.info('Starting time lapse recording to directory {}'.format(directory))
-                i = 0
-
-                for filename in camera.capture_continuous(os.path.join(directory, 'image_{counter:04d}.jpg')):
-                    i += 1
-                    self.logger.info('Captured {}'.format(filename))
-
-                    if n_images and i >= n_images:
-                        break
-
-                    self._time_lapse_stop_condition.acquire()
-                    should_stop = self._time_lapse_stop_condition.wait(timeout=interval)
-                    self._time_lapse_stop_condition.release()
-
-                    if should_stop:
-                        break
-            finally:
-                self._time_lapse_thread = None
-                self.logger.info('Stopped time lapse recording')
-
-        self._time_lapse_thread = threading.Thread(target=capture_thread)
-        self._time_lapse_thread.start()
-
-    @action
-    def stop_time_lapse(self):
-        """
-        Stop a time lapse sequence if it's running
-        """
-
-        if not self._time_lapse_thread:
-            self.logger.info('No time lapse thread is running')
-            return
-
-        self._time_lapse_stop_condition.acquire()
-        self._time_lapse_stop_condition.notify_all()
-        self._time_lapse_stop_condition.release()
-
-        if self._time_lapse_thread:
-            self._time_lapse_thread.join()
-
-    # noinspection PyMethodOverriding
-    @action
-    def start_recording(self, video_file=None, directory=None, name_format='video_%04d.h264', duration=None,
-                        split_duration=None, **opts):
-        """
-        Start recording to a video file or to multiple video files
-
-        :param video_file: Path of the video file, if you want to keep the recording all in one file
-        :type video_file: str
-
-        :param directory: Path of the directory that will store the video files, if you want to split the recording
-            on multiple files. Note that you need to specify either video_file (to save the recording to one single
-            file) or directory (to split the recording on multiple files)
-        :type directory: str
-
-        :param name_format: If you're splitting the recording to multiple files, then you can specify the name format
-            for those files (default: 'video_%04d.h264')
-            on multiple files. Note that you need to specify either video_file (to save the recording to one single
-            file) or directory (to split the recording on multiple files)
-        :type name_format: str
-
-        :param duration: Video duration in seconds (default: None, record until stop_recording is called)
-        :type duration: float
-
-        :param split_duration: If you're splitting the recording to multiple files, then you should specify how long
-            each video should be in seconds
-        :type split_duration: float
-
-        :param opts: Extra options to pass to the camera (see
-            https://www.raspberrypi.org/documentation/usage/camera/python/README.md)
-        """
-
-        if self._recording_thread:
-            return None, 'A recording thread is already running'
-
-        multifile = not video_file
-        if multifile and not (directory and split_duration):
-            return None, 'No video_file specified for single file capture and no directory/split_duration ' + \
-                   'specified for multi-file split'
-
-        camera = self._get_camera(**opts)
-        video_file = os.path.abspath(os.path.expanduser(video_file))
-
-        def recording_thread():
-            try:
-                if not multifile:
-                    self.logger.info('Starting recording to video file {}'.format(video_file))
-                    camera.start_recording(video_file, format='h264')
-                    self._recording_stop_condition.acquire()
-                    self._recording_stop_condition.wait(timeout=duration)
-                    self._recording_stop_condition.release()
-                    self.logger.info('Video recorded to {}'.format(video_file))
-                    return
-
-                self.logger.info('Starting recording video files to directory {}'.format(directory))
-                i = 1
-                end_time = None
-                timeout = split_duration
-
-                if duration is not None:
-                    end_time = time.time() + duration
-                    timeout = min(split_duration, duration)
-
-                camera.start_recording(name_format % i, format='h264')
-                self._recording_stop_condition.acquire()
-                self._recording_stop_condition.wait(timeout=timeout)
-                self._recording_stop_condition.release()
-                self.logger.info('Video file {} saved'.format(name_format % i))
-
-                while True:
-                    i += 1
-                    timeout = None
-
-                    if end_time:
-                        remaining_duration = end_time - time.time()
-                        timeout = min(split_duration, remaining_duration)
-                        if remaining_duration <= 0:
-                            break
-
-                    camera.split_recording(name_format % i)
-                    self._recording_stop_condition.acquire()
-                    should_stop = self._recording_stop_condition.wait(timeout=timeout)
-                    self._recording_stop_condition.release()
-                    self.logger.info('Video file {} saved'.format(name_format % i))
-
-                    if should_stop:
-                        break
-            finally:
-                try:
-                    camera.stop_recording()
-                except Exception as e:
-                    self.logger.exception(e)
-
-                self._recording_thread = None
-                self.logger.info('Stopped camera recording')
-
-        self._recording_thread = threading.Thread(target=recording_thread)
-        self._recording_thread.start()
-
-    @action
-    def stop_recording(self, **kwargs):
-        """
-        Stop a camera recording
-        """
-
-        if not self._recording_thread:
-            self.logger.info('No recording thread is running')
-            return
-
-        self._recording_stop_condition.acquire()
-        self._recording_stop_condition.notify_all()
-        self._recording_stop_condition.release()
-
-        if self._recording_thread:
-            self._recording_thread.join()
-
-    # noinspection PyShadowingBuiltins
-    @action
-    def start_streaming(self, listen_port: Optional[int] = None, format='h264', **opts):
-        """
-        Start recording to a network stream
-
-        :param listen_port: TCP listen port (default: `listen_port` configured value or 5000)
-        :type listen_port: int
-
-        :param format: Video stream format (default: h264)
-        :type format: str
-
-        :param opts: Extra options to pass to the camera (see
-            https://www.raspberrypi.org/documentation/usage/camera/python/README.md)
-        """
-
-        if self._streaming_thread:
-            return None, 'A streaming thread is already running'
-
-        if not listen_port:
-            listen_port = self.listen_port
-
-        camera = self._get_camera(**opts)
-        server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        server_socket.bind(('0.0.0.0', listen_port))
-        server_socket.listen(1)
-        server_socket.settimeout(1)
-
-        # noinspection PyBroadException
-        def streaming_thread():
-            try:
-                self.logger.info('Starting streaming on port {}'.format(listen_port))
-
-                while self._can_stream:
-                    try:
-                        sock = server_socket.accept()[0]
-                        stream = sock.makefile('wb')
-                        self.logger.info('Accepted client connection from {}'.format(sock.getpeername()))
-                    except socket.timeout:
-                        continue
-
-                    try:
-                        if stream:
-                            camera.start_recording(stream, format=format)
-                            while True:
-                                camera.wait_recording(1)
-                    except ConnectionError:
-                        self.logger.info('Client closed connection')
-                    finally:
-                        if sock:
-                            sock.close()
-            finally:
-                try:
-                    server_socket.close()
-                    camera.stop_recording()
-                except:
-                    pass
-
-                try:
-                    camera.close()
-                except:
-                    pass
-
-                self._streaming_thread = None
-                self.logger.info('Stopped camera stream')
-
-        self._can_stream = True
-        self._streaming_thread = threading.Thread(target=streaming_thread)
-        self._streaming_thread.start()
-
-    @action
-    def stop_streaming(self):
-        """
-        Stop a camera streaming session
-        """
-
-        if not self._streaming_thread:
-            self.logger.info('No recording thread is running')
-            return
-
-        self._can_stream = False
-
-        if self._streaming_thread:
-            self._streaming_thread.join()
-
-    @action
-    def is_streaming(self):
-        """
-        :return: True if the Pi Camera network streaming thread is running,
-            False otherwise.
-        """
-        return self._streaming_thread is not None
-
-
-# vim:sw=4:ts=4:et:

platypush/plugins/camera/pi/__init__.py

@@ -0,0 +1,179 @@
+import threading
+import time
+
+from typing import Optional, List, Tuple, Union
+
+from platypush.plugins import action
+from platypush.plugins.camera import CameraPlugin, Camera
+from platypush.plugins.camera.pi.model import PiCameraInfo, PiCamera
+
+
+class CameraPiPlugin(CameraPlugin):
+    """
+    Plugin to control a Pi camera.
+
+    Requires:
+
+        * **picamera** (``pip install picamera``)
+        * **numpy** (``pip install numpy``)
+        * **Pillow** (``pip install Pillow``)
+
+    """
+
+    _camera_class = PiCamera
+    _camera_info_class = PiCameraInfo
+
+    def __init__(self, device: int = 0, fps: float = 30., warmup_seconds: float = 2., sharpness: int = 0,
+                 contrast: int = 0, brightness: int = 50, video_stabilization: bool = False, iso: int = 0,
+                 exposure_compensation: int = 0, exposure_mode: str = 'auto', meter_mode: str = 'average',
+                 awb_mode: str = 'auto', image_effect: str = 'none', led_pin: Optional[int] = None,
+                 color_effects: Optional[Union[str, List[str]]] = None,
+                 zoom: Tuple[float, float, float, float] = (0.0, 0.0, 1.0, 1.0), **camera):
+        """
+        See https://www.raspberrypi.org/documentation/usage/camera/python/README.md
+        for a detailed reference about the Pi camera options.
+
+        :param camera: Options for the base camera plugin (see :class:`platypush.plugins.camera.CameraPlugin`).
+        """
+        super().__init__(device=device, fps=fps, warmup_seconds=warmup_seconds, **camera)
+
+        self.camera_info.sharpness = sharpness
+        self.camera_info.contrast = contrast
+        self.camera_info.brightness = brightness
+        self.camera_info.video_stabilization = video_stabilization
+        self.camera_info.iso = iso
+        self.camera_info.exposure_compensation = exposure_compensation
+        self.camera_info.meter_mode = meter_mode
+        self.camera_info.exposure_mode = exposure_mode
+        self.camera_info.awb_mode = awb_mode
+        self.camera_info.image_effect = image_effect
+        self.camera_info.color_effects = color_effects
+        self.camera_info.zoom = zoom
+        self.camera_info.led_pin = led_pin
+
+    # noinspection DuplicatedCode
+    def prepare_device(self, device: PiCamera):
+        # noinspection PyUnresolvedReferences
+        import picamera
+
+        camera = picamera.PiCamera(camera_num=device.info.device, resolution=device.info.resolution,
+                                   framerate=device.info.fps, led_pin=device.info.led_pin)
+
+        camera.hflip = device.info.horizontal_flip
+        camera.vflip = device.info.vertical_flip
+        camera.sharpness = device.info.sharpness
+        camera.contrast = device.info.contrast
+        camera.brightness = device.info.brightness
+        camera.video_stabilization = device.info.video_stabilization
+        camera.iso = device.info.iso
+        camera.exposure_compensation = device.info.exposure_compensation
+        camera.exposure_mode = device.info.exposure_mode
+        camera.meter_mode = device.info.meter_mode
+        camera.awb_mode = device.info.awb_mode
+        camera.image_effect = device.info.image_effect
+        camera.color_effects = device.info.color_effects
+        camera.rotation = device.info.rotate or 0
+        camera.zoom = device.info.zoom
+
+        return camera
+
+    def release_device(self, device: PiCamera):
+        # noinspection PyUnresolvedReferences
+        import picamera
+
+        if device.object:
+            try:
+                device.object.stop_recording()
+            except picamera.PiCameraNotRecording:
+                pass
+
+        if device.object and not device.object.closed:
+            try:
+                device.object.close()
+            except picamera.PiCameraClosed:
+                pass
+
+    def capture_frame(self, camera: Camera, *args, **kwargs):
+        import numpy as np
+        from PIL import Image
+
+        shape = (camera.info.resolution[1] + (camera.info.resolution[1] % 16),
+                 camera.info.resolution[0] + (camera.info.resolution[0] % 32),
+                 3)
+
+        frame = np.empty(shape, dtype=np.uint8)
+        camera.object.capture(frame, 'rgb')
+        return Image.fromarray(frame)
+
+    def start_preview(self, camera: Camera):
+        """
+        Start camera preview.
+        """
+        camera.object.start_preview()
+
+    def stop_preview(self, camera: Camera):
+        """
+        Stop camera preview.
+        """
+        try:
+            camera.object.stop_preview()
+        except Exception as e:
+            self.logger.warning(str(e))
+
+    @action
+    def capture_preview(self, duration: Optional[float] = None, n_frames: Optional[int] = None, **camera) -> dict:
+        camera = self.open_device(**camera)
+        self.start_preview(camera)
+
+        if n_frames:
+            duration = n_frames * (camera.info.fps or 0)
+        if duration:
+            threading.Timer(duration, lambda: self.stop_preview(camera))
+
+        return self.status()
+
+    def streaming_thread(self, camera: Camera, stream_format: str, duration: Optional[float] = None):
+        server_socket = self._prepare_server_socket(camera)
+        sock = None
+        streaming_started_time = time.time()
+        self.logger.info('Starting streaming on port {}'.format(camera.info.listen_port))
+
+        try:
+            while camera.stream_event.is_set():
+                if duration and time.time() - streaming_started_time >= duration:
+                    break
+
+                sock = self._accept_client(server_socket)
+                if not sock:
+                    continue
+
+                try:
+                    camera.object.start_recording(sock, format=stream_format)
+                    while camera.stream_event.is_set():
+                        camera.object.wait_recording(1)
+                except ConnectionError:
+                    self.logger.info('Client closed connection')
+                finally:
+                    if sock:
+                        sock.close()
+        finally:
+            self._cleanup_stream(camera, server_socket, sock)
+            try:
+                camera.object.stop_recording()
+            except Exception as e:
+                self.logger.warning('Error while stopping camera recording: {}'.format(str(e)))
+
+            try:
+                camera.object.close()
+            except Exception as e:
+                self.logger.warning('Error while closing camera: {}'.format(str(e)))
+
+            self.logger.info('Stopped camera stream')
+
+    @action
+    def start_streaming(self, duration: Optional[float] = None, stream_format: str = 'h264', **camera) -> dict:
+        camera = self.open_device(stream_format=stream_format, **camera)
+        return self._start_streaming(camera, duration, stream_format)
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/camera/pi/model.py

@@ -0,0 +1,46 @@
+from dataclasses import dataclass
+from typing import Optional, Union, List, Tuple
+
+from platypush.plugins.camera import CameraInfo, Camera
+
+
+@dataclass
+class PiCameraInfo(CameraInfo):
+    sharpness: int = 0
+    contrast: int = 0
+    brightness: int = 50
+    video_stabilization: bool = False
+    iso: int = 0
+    exposure_compensation: int = 0
+    exposure_mode: str = 'auto'
+    meter_mode: str = 'average'
+    awb_mode: str = 'auto'
+    image_effect: str = 'none'
+    color_effects: Optional[Union[str, List[str]]] = None
+    zoom: Tuple[float, float, float, float] = (0.0, 0.0, 1.0, 1.0)
+    led_pin: Optional[int] = None
+
+    def to_dict(self) -> dict:
+        return {
+            'sharpness': self.sharpness,
+            'contrast': self.contrast,
+            'brightness': self.brightness,
+            'video_stabilization': self.video_stabilization,
+            'iso': self.iso,
+            'exposure_compensation': self.exposure_compensation,
+            'exposure_mode': self.exposure_mode,
+            'meter_mode': self.meter_mode,
+            'awb_mode': self.awb_mode,
+            'image_effect': self.image_effect,
+            'color_effects': self.color_effects,
+            'zoom': self.zoom,
+            'led_pin': self.led_pin,
+            **super().to_dict()
+        }
+
+
+class PiCamera(Camera):
+    info: PiCameraInfo
+
+
+# vim:sw=4:ts=4:et:

platypush/plugins/qrcode.py

@@ -30,7 +30,7 @@ class QrcodePlugin(Plugin):
     def __init__(self, camera_plugin: Optional[str] = None, **kwargs):
         """
         :param camera_plugin: Name of the plugin that will be used as a camera to capture images (e.g.
-            ``camera`` or ``camera.pi``).
+            ``camera.cv`` or ``camera.pi``).
         """
         super().__init__(**kwargs)
         self.camera_plugin = camera_plugin
@@ -104,6 +104,8 @@ class QrcodePlugin(Plugin):
 
     def _convert_frame(self, frame):
         import numpy as np
+        from PIL import Image
+
         assert isinstance(frame, np.ndarray), \
                 'Image conversion only works with numpy arrays for now (got {})'.format(type(frame))
         mode = 'RGB'

platypush/utils/__init__.py

@@ -76,6 +76,23 @@ def get_plugin_class_by_name(plugin_name):
         return None
 
 
+def get_plugin_name_by_class(plugin) -> str:
+    """Gets the common name of a plugin (e.g. "music.mpd" or "media.vlc") given its class. """
+
+    from platypush.plugins import Plugin
+
+    if isinstance(plugin, Plugin):
+        plugin = plugin.__class__
+
+    class_name = plugin.__name__
+    class_tokens = [
+        token.lower() for token in re.sub(r'([A-Z])', r' \1', class_name).split(' ')
+        if token.strip() and token != 'Plugin'
+    ]
+
+    return '.'.join(class_tokens)
+
+
 def set_timeout(seconds, on_timeout):
     """
     Set a function to be called if timeout expires without being cleared.

requirements.txt

@@ -81,6 +81,7 @@ zeroconf
 
 # Support for the RaspberryPi camera module
 # picamera
+# Pillow
 
 # Support for torrents download
 # python-libtorrent
@@ -298,3 +299,9 @@ croniter
 
 # Support for NextCloud integration
 # git+https://github.com/EnterpriseyIntranet/nextcloud-API.git
+
+# Support for FFmpeg integration
+# ffmpeg-python
+
+# Generic support for cameras
+# Pillow

setup.py

@@ -194,8 +194,10 @@ setup(
         'youtube': ['youtube-dl'],
         # Support for torrents download
         'torrent': ['python-libtorrent'],
+        # Generic support for cameras
+        'camera': ['numpy', 'Pillow'],
         # Support for RaspberryPi camera
-        'picamera': ['picamera', 'numpy'],
+        'picamera': ['picamera', 'numpy', 'Pillow'],
         # Support for inotify file monitors
         'inotify': ['inotify'],
         # Support for Google Assistant
@@ -264,8 +266,8 @@ setup(
         'pwm3901': ['pwm3901'],
         # Support for MLX90640 thermal camera
         'mlx90640': ['Pillow'],
-        # Support for machine learning and CV plugin
+        # Support for machine learning models and cameras over OpenCV
-        'cv': ['cv2', 'numpy'],
+        'cv': ['cv2', 'numpy', 'Pillow'],
         # Support for the generation of HTML documentation from docstring
         'htmldoc': ['docutils'],
         # Support for Node-RED integration
@@ -334,5 +336,7 @@ setup(
         'imap': ['imapclient'],
         # Support for NextCloud integration
         'nextcloud': ['nextcloud-API @ git+https://github.com/EnterpriseyIntranet/nextcloud-API.git'],
+        # Support for FFmpeg integration
+        'ffmpeg': ['ffmpeg-python'],
     },
 )