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pixoo.py
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pixoo.py
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"""
Pixoo
"""
import sys
import socket
from time import sleep
from PIL import Image
from binascii import unhexlify, hexlify
from math import log10, ceil
class Pixoo(object):
CMD_SET_SYSTEM_BRIGHTNESS = 0x74
CMD_SPP_SET_USER_GIF = 0xb1
CMD_DRAWING_ENCODE_PIC = 0x5b
BOX_MODE_CLOCK=0
BOX_MODE_TEMP=1
BOX_MODE_COLOR=2
BOX_MODE_SPECIAL=3
instance = None
def __init__(self, mac_address):
"""
Constructor
"""
self.mac_address = mac_address
self.btsock = None
@staticmethod
def get():
if Pixoo.instance is None:
Pixoo.instance = Pixoo(Pixoo.BDADDR)
Pixoo.instance.connect()
return Pixoo.instance
def connect(self):
"""
Connect to SPP.
"""
self.btsock = socket.socket(socket.AF_BLUETOOTH, socket.SOCK_STREAM, socket.BTPROTO_RFCOMM)
self.btsock.connect((self.mac_address, 1))
def __spp_frame_checksum(self, args):
"""
Compute frame checksum
"""
return sum(args[1:])&0xffff
def __spp_frame_encode(self, cmd, args):
"""
Encode frame for given command and arguments (list).
"""
payload_size = len(args) + 3
# create our header
frame_header = [1, payload_size & 0xff, (payload_size >> 8) & 0xff, cmd]
# concatenate our args (byte array)
frame_buffer = frame_header + args
# compute checksum (first byte excluded)
cs = self.__spp_frame_checksum(frame_buffer)
# create our suffix (including checksum)
frame_suffix = [cs&0xff, (cs>>8)&0xff, 2]
# return output buffer
return frame_buffer+frame_suffix
def send(self, cmd, args):
"""
Send data to SPP.
"""
spp_frame = self.__spp_frame_encode(cmd, args)
if self.btsock is not None:
nb_sent = self.btsock.send(bytes(spp_frame))
def set_system_brightness(self, brightness):
"""
Set system brightness.
"""
self.send(Pixoo.CMD_SET_SYSTEM_BRIGHTNESS, [brightness&0xff])
def set_box_mode(self, boxmode, visual=0, mode=0):
"""
Set box mode.
"""
self.send(0x45, [boxmode&0xff, visual&0xff, mode&0xff])
def set_color(self, r,g,b):
"""
Set color.
"""
self.send(0x6f, [r&0xff, g&0xff, b&0xff])
def encode_image(self, filepath):
img = Image.open(filepath)
return self.encode_raw_image(img)
def encode_raw_image(self, img):
"""
Encode a 16x16 image.
"""
# ensure image is 16x16
w,h = img.size
if w == h:
# resize if image is too big
if w > 16:
img = img.resize((16,16))
# create palette and pixel array
pixels = []
palette = []
for y in range(16):
for x in range(16):
pix = img.getpixel((x,y))
if len(pix) == 4:
r,g,b,a = pix
elif len(pix) == 3:
r,g,b = pix
if (r,g,b) not in palette:
palette.append((r,g,b))
idx = len(palette)-1
else:
idx = palette.index((r,g,b))
pixels.append(idx)
# encode pixels
bitwidth = ceil(log10(len(palette))/log10(2))
nbytes = ceil((256*bitwidth)/8.)
encoded_pixels = [0]*nbytes
encoded_pixels = []
encoded_byte = ''
for i in pixels:
encoded_byte = bin(i)[2:].rjust(bitwidth, '0') + encoded_byte
if len(encoded_byte) >= 8:
encoded_pixels.append(encoded_byte[-8:])
encoded_byte = encoded_byte[:-8]
encoded_data = [int(c, 2) for c in encoded_pixels]
encoded_palette = []
for r,g,b in palette:
encoded_palette += [r,g,b]
return (len(palette), encoded_palette, encoded_data)
else:
print('[!] Image must be square.')
def draw_gif(self, filepath, speed=100):
"""
Parse Gif file and draw as animation.
"""
# encode frames
frames = []
timecode = 0
anim_gif = Image.open(filepath)
for n in range(anim_gif.n_frames):
anim_gif.seek(n)
nb_colors, palette, pixel_data = self.encode_raw_image(anim_gif.convert(mode='RGB'))
frame_size = 7 + len(pixel_data) + len(palette)
frame_header = [0xAA, frame_size&0xff, (frame_size>>8)&0xff, timecode&0xff, (timecode>>8)&0xff, 0, nb_colors]
frame = frame_header + palette + pixel_data
frames += frame
timecode += speed
# send animation
nchunks = ceil(len(frames)/200.)
total_size = len(frames)
for i in range(nchunks):
chunk = [total_size&0xff, (total_size>>8)&0xff, i]
self.send(0x49, chunk+frames[i*200:(i+1)*200])
def draw_anim(self, filepaths, speed=100):
timecode=0
# encode frames
frames = []
n=0
for filepath in filepaths:
nb_colors, palette, pixel_data = self.encode_image(filepath)
frame_size = 7 + len(pixel_data) + len(palette)
frame_header = [0xAA, frame_size&0xff, (frame_size>>8)&0xff, timecode&0xff, (timecode>>8)&0xff, 0, nb_colors]
frame = frame_header + palette + pixel_data
frames += frame
timecode += speed
n += 1
# send animation
nchunks = ceil(len(frames)/200.)
total_size = len(frames)
for i in range(nchunks):
chunk = [total_size&0xff, (total_size>>8)&0xff, i]
self.send(0x49, chunk+frames[i*200:(i+1)*200])
def draw_pic(self, filepath):
"""
Draw encoded picture.
"""
nb_colors, palette, pixel_data = self.encode_image(filepath)
frame_size = 7 + len(pixel_data) + len(palette)
frame_header = [0xAA, frame_size&0xff, (frame_size>>8)&0xff, 0, 0, 0, nb_colors]
frame = frame_header + palette + pixel_data
prefix = [0x0, 0x0A,0x0A,0x04]
self.send(0x44, prefix+frame)
class PixooMax(Pixoo):
"""
PixooMax class, derives from Pixoo but does not support animation yet.
"""
def __init__(self, mac_address):
super().__init__(mac_address)
def draw_pic(self, filepath):
"""
Draw encoded picture.
"""
nb_colors, palette, pixel_data = self.encode_image(filepath)
frame_size = 8 + len(pixel_data) + len(palette)
frame_header = [0xAA, frame_size&0xff, (frame_size>>8)&0xff, 0, 0, 3, nb_colors&0xff, (nb_colors>>8)&0xff]
frame = frame_header + palette + pixel_data
prefix = [0x0, 0x0A,0x0A,0x04]
self.send(0x44, prefix+frame)
def draw_gif(self, filepath, speed=100):
raise 'NotYetImplemented'
def draw_anim(self, filepaths, speed=100):
raise 'NotYetImplemented'
def encode_image(self, filepath):
img = Image.open(filepath)
img = img.convert(mode="P", palette=Image.ADAPTIVE, colors=256).convert(mode="RGB")
return self.encode_raw_image(img)
def encode_raw_image(self, img):
"""
Encode a 32x32 image.
"""
# ensure image is 32x32
w,h = img.size
if w == h:
# resize if image is too big
if w > 32:
img = img.resize((32,32))
# create palette and pixel array
pixels = []
palette = []
for y in range(32):
for x in range(32):
pix = img.getpixel((x,y))
if len(pix) == 4:
r,g,b,a = pix
elif len(pix) == 3:
r,g,b = pix
if (r,g,b) not in palette:
palette.append((r,g,b))
idx = len(palette)-1
else:
idx = palette.index((r,g,b))
pixels.append(idx)
# encode pixels
bitwidth = ceil(log10(len(palette))/log10(2))
nbytes = ceil((256*bitwidth)/8.)
encoded_pixels = [0]*nbytes
encoded_pixels = []
encoded_byte = ''
# Create our pixels bitstream
for i in pixels:
encoded_byte = bin(i)[2:].rjust(bitwidth, '0') + encoded_byte
# Encode pixel data
while len(encoded_byte) >= 8:
encoded_pixels.append(encoded_byte[-8:])
encoded_byte = encoded_byte[:-8]
# If some bits left, pack and encode
padding = 8 - len(encoded_byte)
encoded_pixels.append(encoded_byte.rjust(bitwidth, '0'))
# Convert into array of 8-bit values
encoded_data = [int(c, 2) for c in encoded_pixels]
encoded_palette = []
for r,g,b in palette:
encoded_palette += [r,g,b]
return (len(palette), encoded_palette, encoded_data)
else:
print('[!] Image must be square.')
if __name__ == '__main__':
if len(sys.argv) >= 3:
pixoo_baddr = sys.argv[1]
img_path = sys.argv[2]
pixoo = PixooMax(pixoo_baddr)
pixoo.connect()
# mandatory to wait at least 1 second
sleep(1)
# draw image
pixoo.draw_pic(img_path)
else:
print('Usage: %s <Pixoo BT address> <image path>' % sys.argv[0])