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capture_images_script.py
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capture_images_script.py
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import os
import usb1
from PIL import Image
from io import BytesIO
import argparse
import time
import cv2
import numpy as np
from threading import Thread
WEBUSB_JPEG_MAGIC = 0x2B2D2B2D
WEBUSB_TEXT_MAGIC = 0x0F100E12
VendorId = 0x2886 # seeed studio
ProductId = [0x8060, 0x8061]
class Receive_Mess():
def __init__(self, arg, device_id):
self.showimg = not arg.unshow
self.saveimg = not arg.unsave
self.interval = arg.interval
self.img_number = 0
self.ProductId = []
os.makedirs("./save_img", exist_ok=True)
self.expect_size = 0
self.buff = bytearray()
self.device_id = device_id
self.context = usb1.USBContext()
self.get_rlease_device(device_id, False)
self.disconnect()
self.pre_time = time.time() * 1000
time.time_ns()
def start(self):
while True:
if not self.connect():
continue
self.read_data()
del self.handle
self.disconnect()
def read_data(self):
# Device not present, or user is not allowed to access device.
with self.handle.claimInterface(2):
# Do stuff with endpoints on claimed interface.
self.handle.setInterfaceAltSetting(2, 0)
self.handle.controlRead(0x01 << 5, request=0x22, value=0x01, index=2, length=2048, timeout=1000)
# Build a list of transfer objects and submit them to prime the pump.
transfer_list = []
for _ in range(1):
transfer = self.handle.getTransfer()
transfer.setBulk(usb1.ENDPOINT_IN | 2, 2048, callback=self.processReceivedData, timeout=1000)
transfer.submit()
transfer_list.append(transfer)
# Loop as long as there is at least one submitted transfer.
while any(x.isSubmitted() for x in transfer_list):
# reading data
self.context.handleEvents()
def pare_data(self, data: bytearray):
if len(data) == 8 and int.from_bytes(bytes(data[:4]), 'big') == WEBUSB_JPEG_MAGIC:
self.expect_size = int.from_bytes(bytes(data[4:]), 'big')
self.buff = bytearray()
elif len(data) == 8 and int.from_bytes(bytes(data[:4]), 'big') == WEBUSB_TEXT_MAGIC:
self.expect_size = int.from_bytes(bytes(data[4:]), 'big')
self.buff = bytearray()
else:
self.buff = self.buff + data
if self.expect_size == len(self.buff):
try:
Image.open(BytesIO(self.buff))
except:
self.buff = bytearray()
return
if self.saveimg and ((time.time() * 1000 - self.pre_time) > self.interval):
with open(f'./save_img/{time.time()}.jpg', 'wb') as f:
f.write(bytes(self.buff))
self.img_number += 1
print(f'\rNumber of saved pictures on device {self.device_id}：{self.img_number}', end='')
self.pre_time = time.time() * 1000
if self.showimg:
self.show_byte()
self.buff = bytearray()
def show_byte(self):
try:
img = Image.open(BytesIO(self.buff))
img = np.array(img)
cv2.imshow('img', cv2.cvtColor(img,cv2.COLOR_RGB2BGR))
cv2.waitKey(1)
except:
return
def processReceivedData(self, transfer):
if transfer.getStatus() != usb1.TRANSFER_COMPLETED:
# transfer.close()
return
data = transfer.getBuffer()[:transfer.getActualLength()]
# Process data...
self.pare_data(data)
# Resubmit transfer once data is processed.
transfer.submit()
def connect(self):
'''Get open devices'''
self.handle = self.get_rlease_device(self.device_id, get=True)
if self.handle is None:
print('\rPlease plug in the device!')
return False
with self.handle.claimInterface(2):
self.handle.setInterfaceAltSetting(2, 0)
self.handle.controlRead(0x01 << 5, request=0x22, value=0x01, index=2, length=2048, timeout=1000)
print('device is connected')
return True
def disconnect(self):
try:
print('Resetting device...')
with usb1.USBContext() as context:
handle = context.getByVendorIDAndProductID(VendorId, self.ProductId[self.device_id],
skip_on_error=False).open()
handle.controlRead(0x01 << 5, request=0x22, value=0x00, index=2, length=2048, timeout=1000)
handle.close()
print('Device has been reset!')
return True
except:
return False
def get_rlease_device(self, did, get=True):
'''Turn the device on or off'''
tmp = 0
print('*' * 50)
print('looking for device!')
for device in self.context.getDeviceIterator(skip_on_error=True):
product_id = device.getProductID()
vendor_id = device.getVendorID()
device_addr = device.getDeviceAddress()
bus = '->'.join(str(x) for x in ['Bus %03i' % (device.getBusNumber(),)] + device.getPortNumberList())
if vendor_id == VendorId and product_id in ProductId and tmp == did:
self.ProductId.append(product_id)
print('\r' + f'\033[4;31mID {vendor_id:04x}:{product_id:04x} {bus} Device {device_addr} \033[0m',
end='')
if get:
return device.open()
else:
device.close()
print(
'\r' + f'\033[4;31mID {vendor_id:04x}:{product_id:04x} {bus} Device {device_addr} CLOSED\033[0m',
flush=True)
elif vendor_id == VendorId and product_id in ProductId:
self.ProductId.append(product_id)
print(f'\033[0;31mID {vendor_id:04x}:{product_id:04x} {bus} Device {device_addr}\033[0m')
tmp = tmp + 1
else:
print(
f'ID {vendor_id:04x}:{product_id:04x} {bus} Device {device_addr}')
def implement(arg, device):
rr = Receive_Mess(arg, device)
time.sleep(1)
rr.start()
if __name__ == '__main__':
opt = argparse.ArgumentParser()
opt.add_argument('--unsave', action='store_true', help='whether save pictures')
opt.add_argument('--unshow', action='store_true', help='whether show pictures')
opt.add_argument('--device-num', type=int, default=1, help='Number of devices that need to be connected')
opt.add_argument('--interval', type=int, default=300, help='ms,Minimum time interval for saving pictures')
arg = opt.parse_args()
if arg.device_num == 1:
implement(arg, 0)
elif arg.device_num <= 0:
raise 'The number of devices must be at least one!'
else:
pro_ls = []
for i in range(arg.device_num):
pro_ls.append(Thread(target=implement, args=(arg, i,)))
for i in pro_ls:
i.start()