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#!/usr/bin/env python
#Copyright (c) 2011 Walter Bender
#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:
#The above copyright notice and this permission notice shall be included in
#all copies or substantial portions of the Software.
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#THE SOFTWARE.
import gst
import gtk
from camera.tacamera import Camera
from plugin import Plugin
from TurtleArt.taconstants import PALETTES, PALETTE_NAMES
from TurtleArt.talogo import VALUE_BLOCKS, MEDIA_BLOCKS_DICTIONARY
import logging
_logger = logging.getLogger('turtleart-activity camera plugin')
class Camera_plugin(Plugin):
def __init__(self, parent):
self._parent = parent
self._status = False
v4l2src = gst.element_factory_make('v4l2src')
if v4l2src.props.device_name is not None:
if self._parent.running_sugar:
self._imagepath = get_path(self._parent.activity,
'data/turtlepic.png')
else:
self._imagepath = '/tmp/turtlepic.png'
self._camera = Camera(self._imagepath)
self._status = True
def self_test(self):
print 'reporting Camera status %s' % (str(self._status))
return self._status
def setup(self):
if self.self_test():
PALETTES[PALETTE_NAMES.index('sensor')].append('readcamera')
PALETTES[PALETTE_NAMES.index('sensor')].append('luminance')
PALETTES[PALETTE_NAMES.index('sensor')].append('camera')
# TODO: define these blocks in taconstants.py
VALUE_BLOCKS.append('luminance')
MEDIA_BLOCKS_DICTIONARY['camera'] = self.take_picture
self._parent.lc._def_prim('luminance', 0,
lambda self: self.read_camera(True))
self._parent.lc._def_prim('readcamera', 0,
lambda self: self.read_camera())
def stop(self):
if self._self_test():
self._camera.stop_camera_input()
###
def take_picture(self):
if self.self_test():
''' method called by media block '''
self._camera.save_camera_input_to_file()
self._camera.stop_camera_input()
self._parent.lc.filepath = self._imagepath
def read_camera(self, luminance_only=False):
""" Read average pixel from camera and push b, g, r to the stack """
pixbuf = None
array = None
w, h = self._parent.lc._w(), self._parent.lc._h()
if w > 0 and h > 0 and self.self_test():
try:
self._video_capture_device = open('/dev/video0', 'rw')
except:
self._video_capture_device = None
_logger.debug('video capture device not available')
if self._video_capture_device is not None:
self._ag_control = v4l2.v4l2_control(v4l2.V4L2_CID_AUTOGAIN)
try:
ioctl(self._video_capture_device, v4l2.VIDIOC_G_CTRL,
self._ag_control)
self._ag_control.value = 0 # disable AUTOGAIN
ioctl(self._video_capture_device, v4l2.VIDIOC_S_CTRL,
self._ag_control)
except:
_logger.debug('AUTOGAIN control not available')
pass
if self._video_capture_device is not None:
self._video_capture_device.close()
self._camera.save_camera_input_to_file()
self._camera.stop_camera_input()
pixbuf = gtk.gdk.pixbuf_new_from_file_at_size(self._imagepath, w, h)
try:
array = pixbuf.get_pixels()
except:
array = None
if array is not None:
length = len(array) / 3
r, g, b, i = 0, 0, 0, 0
for j in range(length):
r += ord(array[i])
i += 1
g += ord(array[i])
i += 1
b += ord(array[i])
i += 1
if luminance_only:
lum = int((r * 0.3 + g * 0.6 + b * 0.1) / length)
self._parent.lc.update_label_value('luminance', lum)
return lum
else:
self._parent.lc.heap.append(int((b / length)))
self._parent.lc.heap.append(int((g / length)))
self._parent.lc.heap.append(int((r / length)))
else:
if luminance_only:
return -1
else:
self._parent.lc.heap.append(-1)
self._parent.lc.heap.append(-1)
self._parent.lc.heap.append(-1)
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