eMonitor for Story HD - eReader as additional PC screen

jmseight · 04-24-2012, 12:59 AM

[UPDATE] Newest version with several fixes - Please use version 5s.

Hi,

I modified the gtk version of the eMonitor program originally by kranu for Kindle to work on iRiver Story HD.
https://www.mobileread.com/forums/sho...d.php?t=148581

The SHD has 768x1024 display, and gives a much better experience than K3G.
This version has the screen rotated 90deg, and the Pixbuf made into grayscale. I also reduced the quality of the JPG to 50 to reduce refresh time.

You need to get Python 2.7.1, and PyGTK on the PC. The script runs on the PC.
No modification is required on the SHD. From the browser, just go to http://pc_ip_address:8000 (example: http://192.168.1.8:8000).
Please see the original thread for more details.

I test it on Windows 7 and works very well.

Please see the attached.

Code:

#!/usr/bin/python
#eMonitor by Kranu
#Version 2 (9-1-2011)

#modified by jmseight for iRiver Story HD (4-24-2012)
#  Rotate screen 90 deg
#  Made into grayscale image (original is color)
#  Reduce quality for faster load
#  Set to Story HD resolution


#Tested on Windows 7 x64, Python 2.7.2, wxPython 2.8
#For more information, see: http://goo.gl/rJoLp

#+---2-16-2012---+
#This is the same as v2
#Just using pygtk instead of wxWidgets. 
#Tested on Ubuntu

#BEGIN SETUP

#HTTP Server
port=8000              #port of http server (http://127.0.0.1:8000/)

#capture region
#l,t=(1680,1050-800)
l,t=(0,0)              #left and right offset from primary monitor
w,h=(1024,768)          #width and height of capture region
fn ='shot.jpg'         #file name of screenshot
quality = "50"

#//END SETUP

import pygtk, gtk, socket
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer

class serv(BaseHTTPRequestHandler):
  def do_GET(self):
    self.send_response(200)
    if self.path.startswith('/'+fn):
      self.send_header('Content-type','image/jpeg')
      self.end_headers()
  
      screenshot =  gtk.gdk.Pixbuf.rotate_simple(
						gtk.gdk.Pixbuf.get_from_drawable(
							gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, True, 8, w, h),
							gtk.gdk.get_default_root_window(),
							gtk.gdk.colormap_get_system(),
							l, l, 0, 0, w, h),
						gtk.gdk.PIXBUF_ROTATE_COUNTERCLOCKWISE
					)

      screenshot.saturate_and_pixelate(screenshot, 0.0, False)
	  
      screenshot.save(fn, "jpeg", {"quality": quality})

      f=open(fn,'rb')
      self.wfile.write(f.read())
    else:
      self.send_header('Content-type','text/html')
      self.end_headers()
      self.wfile.write('<!doctype html>'\
        '<html lang="en">'\
        '<head>'\
        '<title>eMonitor by Kranu</title>'\
        '</head>'\
        '<body style="margin:0px;">'\
        '<img id="pic" src="'+fn+'" style="float:left;width:100%;height:100%;">'\
        '<script type="text/javascript">'\
        'document.getElementById("pic").onload=function() {'\
        '  document.getElementById("pic").src="'+fn+'?"+(new Date()).getTime();'\
        '}'\
        '</script>'\
        '</body>'\
        '</html>')
try:
  print 'eMonitor by Kranu'

  #Amazon's website is used here for its reliablity. Feel free to change it.
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  s.connect(("amazon.com",80))

  print 'Starting.. ',
  server=HTTPServer(('',port),serv)
  print 'Press Ctrl+C to stop'
  print

  print 'On your Story HD, visit http://'+s.getsockname()[0]+':'+str(port)+'/'

  server.serve_forever()
except KeyboardInterrupt:
  print 'Stopping.. ',
  server.socket.close()
  print 'Have a nice day!'

frostschutz · 04-24-2012, 03:01 AM

Ah, fun things you can do with a browser. Thanks.

jmseight · 04-24-2012, 05:11 PM

Hi All,

Please find the enclosed version using wxpython with support for Dithering with geekmaster's formula 42 translated to python.

Dithering is preferred to eliminate screen flash when viewing videos or games on SHD screen.

You can try to play video on the PC screen with and without dithering to see the difference.

The dithered variable is set to True or False to turn on or off.

Dithered images are saved as png - for smaller size
Grayscale images are saved as jpg - for smaller size

You will need wxpython on the PC.

Thanks,
James

Code:

#!/usr/bin/python
#eMonitor
#Version 3 modified by jmseight for Kindle/Story (4-25-2012)
#  Rotate screen 90 deg
#  Support Dithering if turned on (no flash on videos)
#    support cropping of dithering table
#    saves as png for dithered
#    saves as jpeg for grayscale
#  Reduce quality for faster load
#  Uses GeekMaster's Dithering Formula (MIT license)
#  Set to Story HD resolution

#based on eMonitor by Kranu
#Version 2 (9-1-2011)

#Tested on Windows 7 x64, Python 2.7.2, wxPython 2.8
#For more information, see: http://goo.gl/rJoLp

#BEGIN SETUP

#HTTP Server
port=8000              #port of http server (http://127.0.0.1:8000/)

#capture region
#l,t=(1680,1050-800)
l,t=(0,0)              #left and right offset from primary monitor
w,h=(1024,768)          #width and height of capture region
fn ='shot.png'         #file name of screenshot
quality = "50"

dt = [
    3,129,34,160,10,136,42,168,192,66,223,97,200,73,231,105,50,
    176,18,144,58,184,26,152,239,113,207,81,247,121,215,89,14,
    140,46,180,7,133,38,164,203,77,235,109,196,70,227,101,62,188,
    30,156,54,180,22,148,251,125,219,93,243,117,211,85 ] # 0-255 dither table

white = 255     #white threshold
black = 0       #black threshold
dithered = True  #dithered or not

#//END SETUP

import wx,socket
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer

class serv(BaseHTTPRequestHandler):
  def do_GET(self):
    self.send_response(200)
    if self.path.startswith('/'+fn):
      self.send_header('Content-type','image/jpeg')
      self.end_headers()
  
      app=wx.PySimpleApp()
      context=wx.ScreenDC()
      bitmap=wx.EmptyBitmap(w, h, -1)
 
      memory=wx.MemoryDC()
      memory.SelectObject(bitmap)
      memory.Blit(0, 0, w, h, context, l, t)
      memory.SelectObject(wx.NullBitmap)
 
      image=wx.ImageFromBitmap(bitmap)
      data=list(image.GetData())

#      for i in xrange(0,len(data),3):
#        data[i]=data[i+1]=data[i+2]=chr(int(0.2989*float(ord(data[i]))+0.5870*float(ord(data[i+1]))+0.1140*float(ord(data[i+2]))))

      i=0

      if dithered:
        for y in xrange(0,h-1,1):
          for x in xrange(0,w-1,1):
#            i = (y*w + x)*3
#            j = ((y&7)<<3)|x&7
#            intensity = int((298*ord(data[i])+587*ord(data[i+1])+114*ord(data[i+2]))/1000)
            if dt[((y&7)<<3)|x&7] < (ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2:
              data[i] = '\xff'
            else:
              data[i] = '\x00'
            i=i+3
      else:
        for y in xrange(0,h-1,1):
          for x in xrange(0,w-1,1):
#            i = (y*w + x)*3
#            j = ((y&7)<<3)|x&7
#            intensity = int((298*ord(data[i])+587*ord(data[i+1])+114*ord(data[i+2]))/1000)
            data[i] = chr((ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2)
            i=i+3

      image.SetData("".join(data))
      image = image.Rotate90(False)

      if dithered:
        image.SetOption(wx.IMAGE_OPTION_PNG_FORMAT, str(wx.PNG_TYPE_GREY_RED))
        image.SetOption(wx.IMAGE_OPTION_PNG_BITDEPTH, "8")
        image.SaveFile(fn,wx.BITMAP_TYPE_PNG)
      else:
        image.SetOption("quality", quality)
        image.SaveFile(fn,wx.BITMAP_TYPE_JPEG)

      f=open(fn,'rb')
      self.wfile.write(f.read())
    else:
      self.send_header('Content-type','text/html')
      self.end_headers()
      self.wfile.write('<!doctype html>'\
        '<html lang="en">'\
        '<head>'\
        '<title>eMonitor by Kranu</title>'\
        '</head>'\
        '<body style="margin:0px;">'\
        '<img id="pic" src="'+fn+'" style="float:left;width:100%;height:100%;">'\
        '<script type="text/javascript">'\
        'document.getElementById("pic").onload=function() {'\
        '  document.getElementById("pic").src="'+fn+'?"+(new Date()).getTime();'\
        '}'\
        '</script>'\
        '</body>'\
        '</html>')
try:
  print 'eMonitor by jmseight (based on Kranu)'

  for j in xrange(0, len(dt)-1, 1):
    if dt[j] < black:
      dt[j] = black
    if dt[j] > white:
      dt[j] = white

  #Amazon's website is used here for its reliablity. Feel free to change it.
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  s.connect(("amazon.com",80))

  print 'Starting.. ',
  server=HTTPServer(('',port),serv)
  print 'Press Ctrl+C to stop'
  print

  print 'On your Kindle/Story, visit http://'+s.getsockname()[0]+':'+str(port)+'/'

  server.serve_forever()
except KeyboardInterrupt:
  print 'Stopping.. ',
  server.socket.close()
  print 'Have a nice day!'

jmseight · 04-26-2012, 07:10 PM

Hi All,

I found that for dithered screen, PNG is the smallest file size. For grayscale, PNG is smaller is there is only text windows on the screen, and JPEG is smaller is there is any photos or video.

I modified the Python program so hat for grayscale, it writes two files, both the jpeg and png. It then determine which is smaller and then updates with the smaller file. Since file transfer remains the largest time component, this results in faster updates.

I have found that with Python, to run fast I need to reduce the over number of operations in the critical loop. So in this version I pre-multiply the dither table by 2, so I can remove the last division by 2 or shift. Also, I used 1:2:1 r:g:b instead of 3:6:1 as this will result in less operations.

Code:

#!/usr/bin/python
#eMonitor
#Version 4 modified by jmseight for Kindle/Story (4-26-2012)
#  Rotate screen 90 deg
#  Support Dithering if turned on (no flash on videos)
#    support cropping of dithering table
#    pre-multiple dither table for faster run time
#    saves as png for dithered
#    saves as jpeg and png for grayscale, compare file sizes, then send the smaller file
#  Reduce quality for faster load
#  Uses GeekMaster's Dithering Formula (MIT license)
#  Set to Story HD resolution

#based on eMonitor by Kranu
#Version 2 (9-1-2011)

#Tested on Windows 7 x64, Python 2.7.2, wxPython 2.8
#For more information, see: http://goo.gl/rJoLp

#BEGIN SETUP

#HTTP Server
port=8000              #port of http server (http://127.0.0.1:8000/)

#capture region
#l,t=(1680,1050-800)
l,t=(0,0)              #left and right offset from primary monitor
w,h=(1024,768)          #width and height of capture region
fn1 ='shot1.png'         #file name of screenshot
fn2 ='shot1.jpg'
fn = 'shot.png'
quality = "50"

dt = [
    3,129,34,160,10,136,42,168,192,66,223,97,200,73,231,105,50,
    176,18,144,58,184,26,152,239,113,207,81,247,121,215,89,14,
    140,46,180,7,133,38,164,203,77,235,109,196,70,227,101,62,188,
    30,156,54,180,22,148,251,125,219,93,243,117,211,85 ] # 0-255 dither table

white = 255     #white threshold
black = 0       #black threshold
dithered = False  #dithered or not

#//END SETUP

import wx,socket,os
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer

class serv(BaseHTTPRequestHandler):
  def do_GET(self):
    self.send_response(200)
    if self.path.startswith('/'+fn):
      self.send_header('Content-type','image/jpeg')
      self.end_headers()
  
      app=wx.PySimpleApp()
      context=wx.ScreenDC()
      bitmap=wx.EmptyBitmap(w, h, -1)
 
      memory=wx.MemoryDC()
      memory.SelectObject(bitmap)
      memory.Blit(0, 0, w, h, context, l, t)
      memory.SelectObject(wx.NullBitmap)
 
      image=wx.ImageFromBitmap(bitmap)
      data=list(image.GetData())

#      for i in xrange(0,len(data),3):
#        data[i]=data[i+1]=data[i+2]=chr(int(0.2989*float(ord(data[i]))+0.5870*float(ord(data[i+1]))+0.1140*float(ord(data[i+2]))))

      i=0

      if dithered:
        for y in xrange(0,h-1,1):
          yy=(y&7)<<3
          for x in xrange(0,w-1,1):
#            i = (y*w + x)*3
#            j = ((y&7)<<3)|x&7
#            if dt[yy|x&7] < (ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2:
#            if dt[((y&7)*8)|x&7] < (299*ord(data[i])+587*ord(data[i+1])+114*ord(data[i+2]))/1000 :
            if dt[yy|x&7] < (ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2])):
              data[i] = '\xff'
            else:
              data[i] = '\x00'
            i=i+3
      else:
        for y in xrange(0,h-1,1):
          for x in xrange(0,w-1,1):
#            i = (y*w + x)*3
#            j = ((y&7)<<3)|x&7
            data[i+2]=data[i+1]=data[i]= chr((ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2)
#            data[i] = chr((ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2)
#            data[i] = chr(int((299*ord(data[i])+587*ord(data[i+1])+144*ord(data[i+2]))/1000))
            i=i+3

      image.SetData("".join(data))
      image = image.Rotate90(False)

      image.SetOption(wx.IMAGE_OPTION_PNG_FORMAT, str(wx.PNG_TYPE_GREY_RED))
      image.SetOption(wx.IMAGE_OPTION_PNG_BITDEPTH, "8")

      if dithered:
        image.SaveFile(fn,wx.BITMAP_TYPE_PNG)
      else:
        image.SaveFile(fn1,wx.BITMAP_TYPE_PNG)
        image.SetOption("quality", quality)
        image.SaveFile(fn2,wx.BITMAP_TYPE_JPEG)
        size1 = os.stat(fn1).st_size
        size2 = os.stat(fn2).st_size
        if size2 < size1:
          image.SaveFile(fn,wx.BITMAP_TYPE_JPEG)
        else:
          image.SaveFile(fn,wx.BITMAP_TYPE_PNG)

      f=open(fn,'rb')
      self.wfile.write(f.read())
    else:
      self.send_header('Content-type','text/html')
      self.end_headers()
      self.wfile.write('<!doctype html>'\
        '<html lang="en">'\
        '<head>'\
        '<title>eMonitor by Kranu</title>'\
        '</head>'\
        '<body style="margin:0px;">'\
        '<img id="pic" src="'+fn+'" style="float:left;width:100%;height:100%;">'\
        '<script type="text/javascript">'\
        'document.getElementById("pic").onload=function() {'\
        '  document.getElementById("pic").src="'+fn+'?"+(new Date()).getTime();'\
        '}'\
        '</script>'\
        '</body>'\
        '</html>')
try:
  print 'eMonitor by jmseight (based on Kranu)'

  for j in xrange(0, len(dt)-1, 1):
    if dt[j] < black:
      dt[j] = black
    if dt[j] > white:
      dt[j] = white
  for j in xrange(0, len(dt)-1, 1):
    dt[j] = dt[j] << 2
    
  #Amazon's website is used here for its reliablity. Feel free to change it.
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  s.connect(("amazon.com",80))

  print 'Starting.. ',
  server=HTTPServer(('',port),serv)
  print 'Press Ctrl+C to stop'
  print

  print 'On your Kindle/Story, visit http://'+s.getsockname()[0]+':'+str(port)+'/'

  server.serve_forever()
except KeyboardInterrupt:
  print 'Stopping.. ',
  server.socket.close()
  print 'Have a nice day!'

jmseight · 04-26-2012, 11:42 PM

Fixed problems with dither.

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04-24-2012, 03:01 AM	#2
frostschutz Linux User Posts: 2,279 Karma: 6123806 Join Date: Sep 2010 Location: Heidelberg, Germany Device: none	Ah, fun things you can do with a browser. Thanks.