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pp_imageplayer.py
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pp_imageplayer.py
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import os
import time
from Tkinter import *
import Tkinter
import PIL.Image
import PIL.ImageTk
import PIL.ImageEnhance
from pp_resourcereader import ResourceReader
from pp_showmanager import ShowManager
from pp_pluginmanager import PluginManager
from pp_gpio import PPIO
from pp_utils import Monitor
class ImagePlayer:
""" Displays an image on a canvas for a period of time. Image display can be paused and interrupted
__init_ just makes sure that all the things the player needs are available
play starts playing the track and returns immeadiately
play must end up with a call to tkinter's after, the after callback will interrogae the playing state at intervals and
eventually return through end_callback
input-pressed receives user input while the track is playing. it might pass the input on to the driver
Input-pressed must not wait, it must set a signal and return immeadiately.
The signal is interrogated by the after callback.
"""
# slide state constants
NO_SLIDE = 0
SLIDE_DWELL= 1
# *******************
# external commands
# *******************
def __init__(self,show_id,root,canvas,show_params,track_params,pp_dir,pp_home,pp_profile):
"""
show_id - show instance that player is run from (for monitoring only)
canvas - the canvas onto which the image is to be drawn
show_params - dictionary of show parameters
track_params - disctionary of track paramters
pp_home - data home directory
pp_profile - profile name
"""
self.mon=Monitor()
self.mon.off()
self.show_id=show_id
self.root=root
self.canvas=canvas
self.show_params=show_params
self.track_params=track_params
self.pp_dir=pp_dir
self.pp_home=pp_home
self.pp_profile=pp_profile
# open resources
self.rr=ResourceReader()
# get parameters
self.animate_begin_text=self.track_params['animate-begin']
self.animate_end_text=self.track_params['animate-end']
if self.track_params['duration']<>"":
self.duration= int(self.track_params['duration'])
else:
self.duration= int(self.show_params['duration'])
#create an instance of PPIO so we can create gpio events
self.ppio = PPIO()
# get background image from profile.
self.background_file=''
if self.track_params['background-image']<>'':
self.background_file= self.track_params['background-image']
else:
if self.track_params['display-show-background']=='yes':
self.background_file= self.show_params['background-image']
# get background colour from profile.
if self.track_params['background-colour']<>"":
self.background_colour= self.track_params['background-colour']
else:
self.background_colour= self.show_params['background-colour']
# get image window from profile
if self.track_params['image-window'].strip()<>"":
self.image_window= self.track_params['image-window'].strip()
else:
self.image_window= self.show_params['image-window'].strip()
# open the plugin Manager
self.pim=PluginManager(self.show_id,self.root,self.canvas,self.show_params,self.track_params,self.pp_dir,self.pp_home,self.pp_profile)
def play(self,
track,
showlist,
end_callback,
ready_callback,
enable_menu=False):
"""
track - filename of track to be played
showlist - from which track was taken
end_callback - callback when player terminates
ready_callback - callback just before anytthing is displayed
enable_menu - there will be a child track so display the hint text
"""
# instantiate arguments
self.track=track
self.showlist=showlist
self.enable_menu=enable_menu
self.ready_callback=ready_callback
self.end_callback=end_callback
#init state and signals
self.canvas_centre_x = int(self.canvas['width'])/2
self.canvas_centre_y = int(self.canvas['height'])/2
self.tick = 100 # tick time for image display (milliseconds)
self.dwell = 10*self.duration
self.dwell_counter=0
self.state=ImagePlayer.NO_SLIDE
self.quit_signal=False
self.drawn=None
self.paused=False
self.pause_text=None
self.tick_timer=None
#parse the image_window
error,self.command,self.has_coords,self.image_x1,self.image_y1,self.image_x2,self.image_y2,self.filter=self.parse_window(self.image_window)
if error =='error':
self.mon.err(self,'image window error: '+self.image_window)
self.end('error','image window error')
else:
# create an instance of showmanager so we can control concurrent shows
self.show_manager=ShowManager(self.show_id,self.showlist,self.show_params,self.root,self.canvas,self.pp_dir,self.pp_profile,self.pp_home)
# Control other shows at beginning
reason,message=self.show_manager.show_control(self.track_params['show-control-begin'])
if reason == 'error':
self.end_callback(reason,message)
self=None
else:
#display content
reason,message=self.display_content()
if reason == 'error':
self.mon.err(self,message)
self.end_callback(reason,message)
self=None
else:
# create animation events
reason,message=self.ppio.animate(self.animate_begin_text,id(self))
if reason=='error':
self.mon.err(self,message)
self.end_callback(reason,message)
self=None
else:
# start dwelling
self.mon.log(self,'playing track from show Id: '+str(self.show_id))
self.start_dwell()
def input_pressed(self,symbol):
if symbol =='pause':
self.pause()
elif symbol=='stop':
self.stop()
return
def terminate(self,reason):
# no lower level things to terminate so just go to end
self.end(reason,'kill or error')
def get_links(self):
return self.track_params['links']
# *******************
# internal functions
# *******************
def pause(self):
if not self.paused:
self.paused = True
else:
self.paused=False
def stop(self):
self.quit_signal=True
# ******************************************
# Sequencing
# ********************************************
def start_dwell(self):
if self.ready_callback<>None:
self.ready_callback()
self.state=ImagePlayer.SLIDE_DWELL
self.tick_timer=self.canvas.after(self.tick, self.do_dwell)
def do_dwell(self):
if self.quit_signal == True:
self.mon.log(self,"quit received")
self.end('normal','user quit')
else:
if self.paused == False:
self.dwell_counter=self.dwell_counter+1
# one time flipping of pause text
if self.paused==True and self.pause_text==None:
self.pause_text=self.canvas.create_text(100,100, anchor=NW,
text=self.resource('imageplayer','m01'),
fill="white",
font="arial 25 bold")
self.canvas.update_idletasks( )
if self.paused==False and self.pause_text<>None:
self.canvas.delete(self.pause_text)
self.pause_text=None
self.canvas.update_idletasks( )
if self.dwell<>0 and self.dwell_counter==self.dwell:
self.end('normal','user quit or duration exceeded')
else:
self.tick_timer=self.canvas.after(self.tick, self.do_dwell)
# *****************
# ending the player
# *****************
def end(self,reason,message):
self.state=self.NO_SLIDE
# stop the plugin
if self.track_params['plugin']<>'':
self.pim.stop_plugin()
# abort the timer
if self.tick_timer<>None:
self.canvas.after_cancel(self.tick_timer)
self.tick_timer=None
if reason in ('error','killed'):
self.end_callback(reason,message)
self=None
else:
# normal end so do show control and animation
# Control concurrent shows at end
reason,message=self.show_manager.show_control(self.track_params['show-control-end'])
if reason =='error':
self.mon.err(self,message)
self.end_callback(reason,message)
self=None
else:
# clear events list for this track
if self.track_params['animate-clear']=='yes':
self.ppio.clear_events_list(id(self))
# create animation events for ending
reason,message=self.ppio.animate(self.animate_end_text,id(self))
if reason=='error':
self.mon.err(self,message)
self.end_callback(reason,message)
self=None
else:
self.end_callback('normal',"track has terminated or quit")
self=None
# **********************************
# displaying things
# **********************************
def display_content(self):
#background colour
if self.background_colour<>'':
self.canvas.config(bg=self.background_colour)
self.canvas.delete('pp-content')
# background image
if self.background_file<> '':
self.background_img_file = self.complete_path(self.background_file)
if not os.path.exists(self.background_img_file):
self.mon.err(self,"Background file not found: "+ self.background_img_file)
self.end('error',"Background file not found")
else:
pil_background_img=PIL.Image.open(self.background_img_file)
self.background = PIL.ImageTk.PhotoImage(pil_background_img)
self.drawn = self.canvas.create_image(int(self.canvas['width'])/2,
int(self.canvas['height'])/2,
image=self.background,
anchor=CENTER,
tag='pp-content')
# execute the plugin if required
if self.track_params['plugin']<>'':
reason,message,self.track = self.pim.do_plugin(self.track,self.track_params['plugin'],)
if reason <> 'normal':
return reason,message
#get the track to be displayed
if os.path.exists(self.track)==True:
self.pil_image=PIL.Image.open(self.track)
else:
self.pil_image=None
# display track image
if self.pil_image<>None:
self.image_width,self.image_height=self.pil_image.size
if self.command=='original':
# display image at its original size
if self.has_coords==False:
# load and display the unmodified image in centre
self.tk_img=PIL.ImageTk.PhotoImage(self.pil_image)
self.drawn = self.canvas.create_image(self.canvas_centre_x, self.canvas_centre_y,
image=self.tk_img, anchor=CENTER,
tag='pp-content')
else:
# load and display the unmodified image at x1,y1
self.tk_img=PIL.ImageTk.PhotoImage(self.pil_image)
self.drawn = self.canvas.create_image(self.image_x1, self.image_y1,
image=self.tk_img, anchor=NW,
tag='pp-content')
elif self.command in ('fit','shrink'):
# shrink fit the window or screen preserving aspect
if self.has_coords==True:
window_width=self.image_x2 - self.image_x1
window_height=self.image_y2 - self.image_y1
window_centre_x=(self.image_x2+self.image_x1)/2
window_centre_y= (self.image_y2+self.image_y1)/2
else:
window_width=int(self.canvas['width'])
window_height=int(self.canvas['height'])
window_centre_x=self.canvas_centre_x
window_centre_y=self.canvas_centre_y
if (self.image_width > window_width or self.image_height > window_height and self.command=='fit') or (self.command=='shrink') :
# original image is larger or , shrink it to fit the screen preserving aspect
self.pil_image.thumbnail((window_width,window_height),eval(self.filter))
self.tk_img=PIL.ImageTk.PhotoImage(self.pil_image)
self.drawn = self.canvas.create_image(window_centre_x, window_centre_y,
image=self.tk_img, anchor=CENTER,
tag='pp-content')
else:
# fitting and original image is smaller, expand it to fit the screen preserving aspect
prop_x = float(window_width) / self.image_width
prop_y = float(window_height) / self.image_height
if prop_x > prop_y:
prop=prop_y
else:
prop=prop_x
increased_width=int(self.image_width * prop)
increased_height=int(self.image_height * prop)
# print 'result',prop, increased_width,increased_height
self.pil_image=self.pil_image.resize((increased_width, increased_height),eval(self.filter))
self.tk_img=PIL.ImageTk.PhotoImage(self.pil_image)
self.drawn = self.canvas.create_image(window_centre_x, window_centre_y,
image=self.tk_img, anchor=CENTER,
tag='pp-content')
elif self.command in ('warp'):
# resize to window or screen without preserving aspect
if self.has_coords==True:
window_width=self.image_x2 - self.image_x1
window_height=self.image_y2 - self.image_y1
window_centre_x=(self.image_x2+self.image_x1)/2
window_centre_y= (self.image_y2+self.image_y1)/2
else:
window_width=int(self.canvas['width'])
window_height=int(self.canvas['height'])
window_centre_x=self.canvas_centre_x
window_centre_y=self.canvas_centre_y
self.pil_image=self.pil_image.resize((window_width, window_height),eval(self.filter))
self.tk_img=PIL.ImageTk.PhotoImage(self.pil_image)
self.drawn = self.canvas.create_image(window_centre_x, window_centre_y,
image=self.tk_img, anchor=CENTER,
tag='pp-content')
# display hint if enabled
if self.enable_menu== True:
self.canvas.create_text(int(self.show_params['hint-x']),
int(self.show_params['hint-y']),
text=self.show_params['hint-text'],
fill=self.show_params['hint-colour'],
font=self.show_params['hint-font'],
anchor=NW,
tag='pp-content')
# display show text if enabled
if self.show_params['show-text']<> ''and self.track_params['display-show-text']=='yes':
self.canvas.create_text(int(self.show_params['show-text-x']),int(self.show_params['show-text-y']),
anchor=NW,
text=self.show_params['show-text'],
fill=self.show_params['show-text-colour'],
font=self.show_params['show-text-font'],
tag='pp-content')
# display track text if enabled
if self.track_params['track-text']<> '':
self.canvas.create_text(int(self.track_params['track-text-x']),int(self.track_params['track-text-y']),
anchor=NW,
text=self.track_params['track-text'],
fill=self.track_params['track-text-colour'],
font=self.track_params['track-text-font'],
tag='pp-content')
self.canvas.tag_raise('pp-click-area')
self.canvas.update_idletasks( )
return 'normal',''
# **********************************
# utilties
# **********************************
def parse_window(self,line):
fields = line.split()
# check there is a command field
if len(fields) < 1:
return 'error','',False,0,0,0,0,''
# deal with original whch has 0 or 2 arguments
filter=''
if fields[0]=='original':
if len(fields) not in (1,3):
return 'error','',False,0,0,0,0,''
# deal with window coordinates
if len(fields) == 3:
#window is specified
if not (fields[1].isdigit() and fields[2].isdigit()):
return 'error','',False,0,0,0,0,''
has_window=True
return 'normal',fields[0],has_window,int(fields[1]),int(fields[2]),0,0,filter
else:
# no window
has_window=False
return 'normal',fields[0],has_window,0,0,0,0,filter
#deal with remainder which has 1, 2, 5 or 6arguments
# check basic syntax
if fields[0] not in ('shrink','fit','warp'):
return 'error','',False,0,0,0,0,''
if len(fields) not in (1,2,5,6):
return 'error','',False,0,0,0,0,''
if len(fields)==6 and fields[5] not in ('NEAREST','BILINEAR','BICUBIC','ANTIALIAS'):
return 'error','',False,0,0,0,0,''
if len(fields)==2 and fields[1] not in ('NEAREST','BILINEAR','BICUBIC','ANTIALIAS'):
return 'error','',False,0,0,0,0,''
# deal with window coordinates
if len(fields) in (5,6):
#window is specified
if not (fields[1].isdigit() and fields[2].isdigit() and fields[3].isdigit() and fields[4].isdigit()):
return 'error','',False,0,0,0,0,''
has_window=True
if len(fields)==6:
filter=fields[5]
else:
filter='PIL.Image.NEAREST'
return 'normal',fields[0],has_window,int(fields[1]),int(fields[2]),int(fields[3]),int(fields[4]),filter
else:
# no window
has_window=False
if len(fields)==2:
filter=fields[1]
else:
filter='PIL.Image.NEAREST'
return 'normal',fields[0],has_window,0,0,0,0,filter
def complete_path(self,track_file):
# complete path of the filename of the selected entry
if track_file[0]=="+":
track_file=self.pp_home+track_file[1:]
self.mon.log(self,"Background image is "+ track_file)
return track_file
# get a text string from resources.cfg
def resource(self,section,item):
value=self.rr.get(section,item)
if value==False:
self.mon.err(self, "resource: "+section +': '+ item + " not found" )
self.error()
else:
return value