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这个实现包含四个主要模块:虚拟摄像头核心功能、视频源管理、视频特效处理和主应用界面。代码使用了Kivy框架构建界面,通过pyjnius访问Android原生API,实现了免root的虚拟摄像头功能。
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.togglebutton import ToggleButton
from kivy.uix.image import Image
from kivy.graphics.texture import Texture
from kivy.clock import Clock
from virtual_camera import VirtualCamera
from video_source import VideoSource, SourceType
from effects import *
class VirtualCameraApp(App):
def build(self):
self.camera = VirtualCamera()
self.source = VideoSource(SourceType.GENERATED)
self.camera.virtual_source = self.source
layout = BoxLayout(orientation='vertical')
self.image = Image()
layout.add_widget(self.image)
btn_layout = BoxLayout(size_hint=(1, 0.2))
self.start_btn = Button(text="Start")
self.start_btn.bind(on_press=self.toggle_camera)
btn_layout.add_widget(self.start_btn)
effects = [
("Mirror", MirrorEffect()),
("Grayscale", GrayscaleEffect()),
("Blur", BlurEffect()),
("Edges", EdgeEffect()),
("Red", ColorOverlay((255, 0, 0)))
]
for name, effect in effects:
btn = ToggleButton(text=name)
btn.bind(state=lambda instance, state, e=effect:
self.toggle_effect(e, state == 'down'))
btn_layout.add_widget(btn)
layout.add_widget(btn_layout)
return layout
def toggle_camera(self, instance):
if self.camera.running:
self.camera.stop()
self.start_btn.text = "Start"
Clock.unschedule(self.update_frame)
else:
self.camera.start()
self.start_btn.text = "Stop"
Clock.schedule_interval(self.update_frame, 1.0/30.0)
def toggle_effect(self, effect, active):
if active:
self.camera.effects.append(effect)
else:
self.camera.effects.remove(effect)
def update_frame(self, dt):
if self.camera.frame is not None:
buf = self.camera.frame.tostring()
texture = Texture.create(size=(self.camera.frame.shape[1], self.camera.frame.shape[0]),
colorfmt='bgr')
texture.blit_buffer(buf, colorfmt='bgr', bufferfmt='ubyte')
self.image.texture = texture
if name == 'main':
VirtualCameraApp().run()
import cv2
import numpy as np
class VideoEffect:
def apply(self, frame):
raise NotImplementedError
class MirrorEffect(VideoEffect):
def apply(self, frame):
return cv2.flip(frame, 1)
class GrayscaleEffect(VideoEffect):
def apply(self, frame):
return cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
class BlurEffect(VideoEffect):
def init(self, kernel_size=5):
self.kernel_size = kernel_size
def apply(self, frame):
return cv2.GaussianBlur(frame, (self.kernel_size, self.kernel_size), 0)
class EdgeEffect(VideoEffect):
def apply(self, frame):
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(gray, 100, 200)
return cv2.cvtColor(edges, cv2.COLOR_GRAY2BGR)
class ColorOverlay(VideoEffect):
def init(self, color=(0, 0, 255), alpha=0.5):
self.color = np.array(color, dtype=np.uint8)
self.alpha = alpha
def apply(self, frame):
overlay = np.full_like(frame, self.color)
return cv2.addWeighted(frame, 1-self.alpha, overlay, self.alpha, 0)