Question

我希望创建一个网页来显示来自 raspberry pi 相机的流并控制 Pimoroni 平移倾斜臂。我在网上找到了一些代码来分别完成这些任务，但我正在努力将这两个功能的代码结合起来。从我的研究烧瓶可用于从 HTML 页面获取输入，但这似乎停止了流。以下是网络流的代码：

# Web streaming example
# Source code from the official PiCamera package
# http://picamera.readthedocs.io/en/latest/recipes2.html#web-streaming

import io
import picamera
import logging
import socketserver
from threading import Condition
from http import server

PAGE="""\
<html>
<head>
<title>Camera test</title>
</head>
<body>
<center><h1>Raspberry Pi - Surveillance Camera</h1></center>
<center><img src="stream.mjpg" width="640" height="480"></center>
<button type="button">Left</button>
</body>
</html>
"""

class StreamingOutput(object):
    def __init__(self):
        self.frame = None
        self.buffer = io.BytesIO()
        self.condition = Condition()

    def write(self, buf):
        if buf.startswith(b'\xff\xd8'):
            # New frame, copy the existing buffer's content and notify all
            # clients it's available
            self.buffer.truncate()
            with self.condition:
                self.frame = self.buffer.getvalue()
                self.condition.notify_all()
            self.buffer.seek(0)
        return self.buffer.write(buf)

class StreamingHandler(server.BaseHTTPRequestHandler):
    def do_GET(self):
        if self.path == '/':
            self.send_response(301)
            self.send_header('Location', '/index.html')
            self.end_headers()
        elif self.path == '/index.html':
            content = PAGE.encode('utf-8')
            self.send_response(200)
            self.send_header('Content-Type', 'text/html')
            self.send_header('Content-Length', len(content))
            self.end_headers()
            self.wfile.write(content)
        elif self.path == '/stream.mjpg':
            self.send_response(200)
            self.send_header('Age', 0)
            self.send_header('Cache-Control', 'no-cache, private')
            self.send_header('Pragma', 'no-cache')
            self.send_header('Content-Type', 'multipart/x-mixed-replace; boundary=FRAME')
            self.end_headers()
            try:
                while True:
                    with output.condition:
                        output.condition.wait()
                        frame = output.frame
                    self.wfile.write(b'--FRAME\r\n')
                    self.send_header('Content-Type', 'image/jpeg')
                    self.send_header('Content-Length', len(frame))
                    self.end_headers()
                    self.wfile.write(frame)
                    self.wfile.write(b'\r\n')
            except Exception as e:
                logging.warning(
                    'Removed streaming client %s: %s',
                    self.client_address, str(e))
        else:
            self.send_error(404)
            self.end_headers()

class StreamingServer(socketserver.ThreadingMixIn, server.HTTPServer):
    allow_reuse_address = True
    daemon_threads = True

with picamera.PiCamera(resolution='640x480', framerate=24) as camera:
    output = StreamingOutput()
    #Uncomment the next line to change your Pi's Camera rotation (in degrees)
    #camera.rotation = 90
    camera.start_recording(output, format='mjpeg')
    try:
        address = ('', 8000)
        server = StreamingServer(address, StreamingHandler)
        server.serve_forever()
    finally:
        camera.stop_recording()

这是用于控制手臂平移和倾斜的代码：

   #!/usr/bin/env python

import pantilthat
from sys import exit

try:
    from flask import Flask, render_template
except ImportError:
    exit("This script requires the flask module\nInstall with: sudo pip install flask")

app = Flask(__name__)

@app.route('/')
def home():
    return render_template('gui.html')

@app.route('/api/<direction>/<int:angle>')
def api(direction, angle):
    if angle < 0 or angle > 180:
        return "{'error':'out of range'}"

    angle -= 90

    if direction == 'pan':
        pantilthat.pan(angle)
        return "{{'pan':{}}}".format(angle)

    elif direction == 'tilt':
        pantilthat.tilt(angle)
        return "{{'tilt':{}}}".format(angle)

    return "{'error':'invalid direction'}"

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=9595, debug=True)

导入烧瓶似乎扰乱了流，我无法弄清楚。任何建议将不胜感激。

在 Raspberry Pi 上使用带有视频流的烧瓶

0 个答案: