上次实验使用Python—OpenCV实现，发现传输效果并不是很理想，接下来使用Python和picamera实现树莓派/PC实时摄像头数据共享，主要也可分为服务器和客户端两部分。
服务器（PC/树莓派）Demo如下：
import numpy as np
import cv2
import socket
class VideoStreamingTest(object):
def __init__(self, host, port):
self.server_socket = socket.socket()
self.server_socket.bind((host, port))
self.server_socket.listen(0)
self.connection, self.client_address = self.server_socket.accept()
self.connection = self.connection.makefile('rb')
self.host_name = socket.gethostname()
self.host_ip = socket.gethostbyname(self.host_name)
self.streaming()
def streaming(self):
try:
print("Host: ", self.host_name + ' ' + self.host_ip)
print("Connection from: ", self.client_address)
print("Streaming...")
print("Press 'q' to exit")
# need bytes here
stream_bytes = b' '
while True:
stream_bytes += self.connection.read(1024)
first = stream_bytes.find(b'\xff\xd8')
last = stream_bytes.find(b'\xff\xd9')
if first != -1 and last != -1:
jpg = stream_bytes[first:last + 2]
stream_bytes = stream_bytes[last + 2:]
image = cv2.imdecode(np.frombuffer(jpg, dtype=np.uint8), cv2.IMREAD_COLOR)
cv2.imshow('image', image)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
finally:
self.connection.close()
self.server_socket.close()
if __name__ == '__main__':
# host, port
h, p = "192.168.0.4", 8000
VideoStreamingTest(h, p)
客户端（树莓派）Demo如下：
import io
import socket
import struct
import time
import picamera
# create socket and bind host
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(('192.168.2.104', 8000))
connection = client_socket.makefile('wb')
try:
with picamera.PiCamera() as camera:
camera.resolution = (320, 240) # pi camera resolution
camera.framerate = 15 # 15 frames/sec
time.sleep(2) # give 2 secs for camera to initilize
start = time.time()
stream = io.BytesIO()
# send jpeg format video stream
for foo in camera.capture_continuous(stream, 'jpeg', use_video_port = True):
connection.write(struct.pack('<L', stream.tell()))
connection.flush()
stream.seek(0)
connection.write(stream.read())
if time.time() - start > 600:
break
stream.seek(0)
stream.truncate()
connection.write(struct.pack('<L', 0))
finally:
connection.close()
client_socket.close()
无论是运行速度还是画质都是比较理想的。
