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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# IkaLog
# ======
# Copyright (C) 2015 Takeshi HASEGAWA
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import threading
import time
import cv2
class PreviewRequestHandler(object):
def __init__(self, http_handler):
self._http_handler = http_handler
self._plugin = http_handler.server.parent
self._frame = None
self._new_image = False
self._stopped = False
self._http_handler.send_response(200)
self._http_handler.send_header(
'Content-type', 'multipart/x-mixed-replace; boundary=--frame_boundary')
self._http_handler.end_headers()
self._plugin._listeners.append(self)
while not self._stopped:
time.sleep(0.05)
if (self._frame is None):
continue
# FIXME: JPEG data should be shared among connections, for
# performance
result, jpeg = cv2.imencode('.jpg', self._frame)
if not result:
continue
jpeg_length = len(jpeg)
self.new_image = False
self._http_handler.wfile.write(
'--frame_boundary\r\n'.encode('utf-8')
)
self._http_handler.send_header('Content-type', 'image/jpeg')
self._http_handler.send_header('Content-length', str(jpeg_length))
self._http_handler.end_headers()
self._http_handler.wfile.write(jpeg)
self._plugin._listeners.remove(self)
def on_event(self, event_name, context, params=None):
if event_name == 'on_show_preview':
self._frame = context['engine']['frame']
self._new_image = (self._frame is not None)
elif event_name == 'on_stop':
self._stopped = True
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