ddrescue and Freevo

A Mennucc <[email protected]> Tue, 08 Sep 2009 11:16:58 +0200

Newsgroups	gmane.comp.video.freevo.devel
Message-ID	<[email protected]>

hi,

recently the hard disk in my Freevo box became faulty; I have then used
the good GNU tool 'ddrescue' and I have saved roughly half the recorded
movies. While recovering the files, for each file named xxxx , I
instructed 'ddrescue' to save its log in the file xxxx.ddrescue

I want to share with you some code snippets.

- ddrescue.py is an utility that scans the logfile and summarizes the
quality of the recovered file

- videoitem.py.diff is a patch that uses the above code to recover the
information and make it available to the skins

- Panorama.fxd.diff is a patch that shows the above info in the file
summary in the skin Panorama (other skins may be similarly modified)

So with the above code, when I browse my recovered files with Freevo, I
can see how well they were recovered.

a.

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ddrescue.py (text/x-python, 2.3 KB)

#!/usr/bin/python

# (c) A Mennucc 2009
# License: GNU General Public License v 2

import sys, os
from math import floor


statuslabel={
'?':'non-tried',
'*':'non-trimmed',
'/':'non-split',
'-':'bad',
'+':'finished'}


def ls(filename, verbose=False):
  totalsize=os.path.getsize(filename)

  F= open(filename+".ddrescue")
  F.readline()
  F.readline()
  F.readline()
  for a in F:
    a=a.rstrip('\n')
    if a[0] == "#": continue
    (where,null,size,null,status)=a.split(" ")
    where=a.split(" ")[0]
    where=int(where,16)
    size=int(size,16)
    if (where+size) > totalsize:
      totalsize=where+size

  #def p(j):
  #  return " %sKiB %4.1f%% " % (j/1024,float(j)/float(totalsize)*100.0)
  def p(j):
    s=(float(j)/float(totalsize)*100.0)
    if j > 10000000:
      return "%3.1f%% %sMiB"  % (s,j/(1024*1024),)
    if j < 10000:
      return "%3.1f%% %sB" % (s,j,)
    return "%3.1f%% %sKiB" % (s,j/1024,)

  F= open(filename+".ddrescue")
  a= F.readline()
  while a[0]=="#":
    a= F.readline()

  a=a.rstrip('\n').split(" ")
  (currentpos,currentstatus) = (a[0],a[-1]) 
  currentpos=int(currentpos,16)

  #what is this for???
  #print 'arrived at %s status %s ' % (p(currentpos), statuslabel[currentstatus])

  good=0
  bad=0
  nontrimmed=0
  nonsplit=0
  untried=0

  s=''
  for a in F:
    a=a.rstrip('\n')
    if a[0] == "#": continue
    (where,null,size,null,status)=a.split(" ")
    where=int(where,16)
    size=int(size,16)
    if verbose>1:
      s+= ' at '+p(where)+' size '+p(size)+' status '+statuslabel[status]+'\n'
    if status == '+':
      good+=size
    elif status == '-':
      bad+=size
    elif status == '?':
      untried+=size
    elif status == '/':
      nonsplit+=size
    elif status == '*':
      nontrimmed+=size
    else: raise AssertError(status)

  if verbose == 0:
    return 'good '+p(good)+'\n'
  else:
    return 'good '+p(good)+', untried '+p(untried)+\
        ', nontrimmed '+p(nontrimmed)+', nonsplit '+p(nonsplit)+', bad '+p(bad) +'\n'+ s


if __name__ == "__main__":
  VERBOSE=0
  argv=sys.argv[1:]
  while argv[0] == '-v':
    argv=argv[1:]
    VERBOSE+=1

  for filename in argv:
    if os.path.isfile(filename) and filename[-9:] != '.ddrescue':
      print 'file:',filename
      try:
        print 'ddrescue says: '+ls(filename, verbose=VERBOSE)
      except Exception,s:
        print ' error ',s

Panorama.fxd.diff (text/x-diff, 664 B)

--- /usr/share/freevo/skins/main/Panorama.fxd~	2009-04-07 20:32:05.000000000 +0200
+++ /usr/share/freevo/skins/main/Panorama+ddrescue.fxd	2009-09-01 23:59:00.000000000 +0200
@@ -146,6 +146,10 @@
                         <text font="info value" expression="runtime" />
                         <newline />
                     </if>
+                    <if expression="ddrescue">
+		      <goto_pos x="20" mode="relative" />
+                      <text font="info value" expression="ddrescue" />
+                    </if>
                 </item>
                 <item type="dir">
                     <text font="info tagline" width="max" expression="name" />

videoitem.py.diff (text/x-diff, 1.1 KB)

--- /usr/share/pyshared/freevo/video/videoitem.py~orig~	2009-08-25 22:19:01.000000000 +0200
+++ /usr/share/pyshared/freevo/video/videoitem.py	2009-09-08 11:05:16.000000000 +0200
@@ -54,6 +54,7 @@
 from event import *
 from skin.widgets import ScrollableTextScreen
 
+import ddrescue
 
 class VideoItem(Item):
     """
@@ -394,6 +395,15 @@
 
             return total
 
+        if key == "ddrescue":
+            if os.path.isfile(self.filename+'.ddrescue'):
+                try:
+                    return ddrescue.ls(self.filename)
+                except Exception,e:
+                    return 'ddrescue error: '+str(e)
+            else:
+                return '[no ddrescue]'
+
         return Item.__getitem__(self, key)
 
 
@@ -854,6 +864,8 @@
                 description +=  _('Year')+u' : '+movie['year'] + u'\n'
             if movie['rating']:
                 description +=  _('Rating')+u' : '+movie['rating'] + u'\n'
+                
+            description +=  movie['ddrescue'] + u'\n'
 
         # that's all, we can show this to the user
         ScrollableTextScreen.__init__(self, 'tvguideinfo', description)

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