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gifwriter.py
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gifwriter.py
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from threading import Thread
from threading import Lock
import cv2
import sys
import time
import os
import imageio
# import the Queue class from Python 3
if sys.version_info >= (3, 0):
from queue import Queue
# otherwise, import the Queue class for Python 2.7
else:
from Queue import Queue
################################################################################
class AtomicInteger():
def __init__(self, value=0):
self._value = value
self._lock = Lock()
def inc(self):
with self._lock:
self._value += 1
return self._value
def dec(self):
with self._lock:
self._value -= 1
return self._value
@property
def value(self):
with self._lock:
return self._value
@value.setter
def value(self, v):
with self._lock:
self._value = v
return self._value
threads = AtomicInteger()
################################################################################
def getActiveThreads():
return threads.value
################################################################################
class GifWriter:
#------------------------------------------------------------------------------
def __init__(self, pathName, fps, scale):
self.pathName = pathName
self.fps = fps
self.toWrite = []
self.Q = None
self.scale = scale
self.stopped = False
filename, file_extension = os.path.splitext(pathName)
self.mp4 = file_extension == '.mp4'
#------------------------------------------------------------------------------
def convertImage(self, img):
if self.scale != 1:
img = cv2.resize(img, None, fx=self.scale, fy=self.scale)
if self.mp4:
# 패딩을 추가한다
(h, w) = img.shape[:2]
pw, ph = w, h
blockSize = 16
if w % blockSize != 0:
pw = int(w / blockSize + 1)*blockSize
if h % blockSize != 0:
ph = int(h / blockSize + 1)*blockSize
l = int((pw-w) / 2)
r = (pw-w) - l
t = int((ph-h) / 2)
b = (ph-h) - t
img = cv2.copyMakeBorder(img,t,b,l,r,cv2.BORDER_CONSTANT,value=0)
return cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
#------------------------------------------------------------------------------
def append(self, img):
if self.Q is None:
self.toWrite.append(img)
# 일정 길이 이상의 움직임이 있을 때만 애니메이션으로 간주 (슬라이드 전환을 배제하기 위해서)
if len(self.toWrite) > self.fps * 3:
# 동시에 3개만 진행한다
while threads.value > 2:
time.sleep(0.1)
threads.inc()
#print('writing {}...', self.pathName)
self.Q = Queue()
t = Thread(target=self.update, args=())
t.daemon = True
t.start()
else:
self.Q.put(img)
#------------------------------------------------------------------------------
def isActive(self):
return self.Q is not None
#------------------------------------------------------------------------------
def stop(self):
# indicate that the thread should be stopped
self.stopped = True
#------------------------------------------------------------------------------
def update(self):
gifWriter = imageio.get_writer(self.pathName, mode='I', fps=self.fps)
for f in self.toWrite:
gifWriter.append_data(self.convertImage(f))
self.toWrite = None
# keep looping infinitely
while True:
while not self.Q.empty():
img = self.Q.get()
gifWriter.append_data(self.convertImage(img))
# if the thread indicator variable is set, stop the
# thread
if self.stopped:
gifWriter.close()
gifWriter = None
threads.dec()
return
time.sleep(0)