Mac平台，python3.7实时获取摄像头数据，通过django框架输出到web实时播放简单实例

操作系统：Mac os

开发环境：python3.7, opencv2,django

这几天正在了解用python基于django的web开发，学习新的语言或框架，第一个应用，自然是hello world，在django框架下完成一个hello world后，回想之前写过用opencv获取摄像头实时视频的例子，就想能不能把那个程序整合到现有的web中显示，经过一番折腾，终于小有成就，完成一个简单的实例。以下是主要代码：

videocapture.py   打开摄像头，并实时获取视频信息

from django.shortcuts import render
from django.http import HttpResponse, StreamingHttpResponse

import sys
import cv2
import time
import threading
from .netinfo import get_host_ip

if sys.version_info.major == 2:
    print('Please run this program with python3!')
    sys.exit(0)

def home(request):
    context = {}
    context["Title"] = "Video"
    context["LocalIP"] = get_host_ip()
    context["url"] = "http://"+get_host_ip()+":8000/getVideo"
    return render(request, 'index.html',context)  
    

debug = True
def Camera_isOpened():
    global stream, cap
    cap = cv2.VideoCapture(stream) 

c = 80
width, height = c*4, c*3
width,height = 640,480
resolution = str(width) + "x" + str(height)
orgFrame = None
Running = True
ret = False
stream = 0 #摄像头
try:
    Camera_isOpened()
    cap = cv2.VideoCapture(stream)
except:
    print('Unable to detect camera! \n')
    
orgFrame = None
ret = False
Running = True
def get_image():
    global orgFrame
    global ret
    global Running
    global stream, cap
    global width, height
    while True:
        if Running:
            try:
                if cap.isOpened():
                    ret, orgFrame = cap.read()
                else:
                    time.sleep(0.01)
            except:               
                cap = cv2.VideoCapture(stream)
        else:
            time.sleep(0.01)

th1 = threading.Thread(target = get_image)
th1.setDaemon(True)
th1.start()
def Video():
    global orgFrame
    while True:
        if Running:
            try:
                if cap.isOpened():
                    _ , encodedImage = cv2.imencode(".jpg",orgFrame)
                    #yield(b'--frame\r\n' b'Content-Type : image/jpeg\r\n\r\n' + bytearray(encodedImage) + b'\r\n')
                    yield (b'--frame\r\n'
                           b'Content-Type: image/jpeg\r\n\r\n' + encodedImage.tobytes()+ b'\r\n')
                else:
                    time.sleep(0.01)
            except:               
                time.sleep(0.01)
                print("Exception")
        else:
            time.sleep(0.01)
def getVideo(request):
    return StreamingHttpResponse(Video(),content_type='multipart/x-mixed-replace; boundary=frame')

netinfo.py 获取IP地址

import socket

def get_host_ip():
    """
    查询本机ip地址
    :return:
    """
    try:
        s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
        s.connect(('8.8.8.8',80))
        ip=s.getsockname()[0]
    finally:
        s.close()

    return ip

 

index.html 模板页，用于显示视频

{{Title}}
Local IP:{{LocalIP}}

urls.py中的配置

from django.contrib import admin
from django.urls import path
from views import videocapture

urlpatterns = [
    path('',videocapture.home),
    path('getVideo',videocapture.getVideo)
]

最新源码：https://github.com/ScottFan/webvideo 

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