File mangler

This can be used to detect crashes due to bad streams (see the end of the program for the files which are tested)

test/mangle/VLCUtil.py

+import logging
+import urllib2
+
+def getLogger( module ):
+    logger = logging.getLogger( module )
+    stl = logging.StreamHandler( )
+    formatter = logging.Formatter( '%(asctime)s %(name)s %(levelname)s %(message)s' )
+    stl.setFormatter( formatter )
+    logger.addHandler( stl )
+    logger.setLevel( logging.DEBUG )
+    return logger
+
+def downloadFile( file, source, target, l ):
+    l.info( "Opening %s/%s" % (source,file ) )
+    try:
+        remote = urllib2.urlopen(  "%s/%s" % (source,file ) )
+        l.debug( "Open success, downloading"  )
+        local = open( target + "/" + file, "w+" )
+        local.write( remote.read() )
+    except:
+        return 1
+    return 0
+                                                                                    

test/mangle/mangle.py

+import VLCUtil
+import shutil
+import os
+from random import randint
+import glob
+
+# Todo
+# - Correctly handle errors
+# - Launch VLC in a separate thread and detect hangs
+# - Correct path handling
+
+global conf
+global l
+
+def play_mangled( filename, logfile ):
+    os.chdir( "../.." )
+    vlc_pid = os.spawnvp( os.P_NOWAIT, "./vlc",
+        [ "vlc", "-I", "logger", "--quiet",  "--stop-time", "1",
+          filename , "vlc:quit", "--logfile", logfile ])
+    ( exit_pid, exit_status ) = os.waitpid( vlc_pid, 0 )
+    os.chdir( "test/mangle" )
+    l.debug( "VLC exited with status %i" % exit_status )
+    return exit_status
+
+def mangle_file( filename, header_size, percentage , new_file):
+    shutil.copyfile( filename, new_file )
+    file = open ( new_file, "r+" )
+    for i in range( header_size ):
+        file.seek( i)
+        if( randint(0, 100/percentage) == 0 ):
+            file.write( "%i" % randint (0, 255 ));
+    file.flush()
+    file.close()
+
+def process_file_once( file, header_size ):
+    suffix = randint( 0, 65535 )
+    new_file = conf["temp_folder"] + conf["prefix"] + "%i" % suffix
+    log_file = conf["temp_folder"] + conf["log_prefix"] + "%i" % suffix
+    
+    mangle_file( file, header_size, conf["mangle_ratio"], new_file )
+    status = play_mangled( new_file, log_file )
+    if( status == 0 ):
+        os.remove( new_file )
+        os.remove( log_file )
+    else:
+        l.info( "Potential crash detected : %i, saving results" % suffix )
+        shutil.move( new_file , conf["crashdir"] )
+        shutil.move( log_file , conf["crashdir"] )
+
+def process_file( file, source, header_size ):
+     l.info( "Starting work on " + file )
+
+     if( len( glob.glob( conf["inputdir"] + "/" + file ) ) == 0 ):
+         l.warn( "%s does not exist in %s" % (file, conf["inputdir"] ) )
+         if( VLCUtil.downloadFile( file, source, conf["inputdir"], l ) != 0 ):
+             l.error( "Unable to download %s" % file )
+             return 
+     
+     for i in range( conf["loops"] ):
+         process_file_once( conf["inputdir"] + "/" + file, header_size )
+
+l =  VLCUtil.getLogger( "Mangle" )
+
+conf = {}
+conf["inputdir"] = "input"
+conf["crashdir"] = "crashers"
+conf["temp_folder"] = "/tmp/"
+conf["prefix"] = "mangle."
+conf["log_prefix"] = "vlc-log."
+conf["mangle_ratio"] = 4 # Change X% of bytes within header
+conf["loops"]  = 20
+
+l.debug( "Creating folders" )
+
+try:
+    os.makedirs( conf["crashdir"] )
+    os.makedirs( conf["inputdir"] )
+    os.makedirs( conf["temp_folder"] )
+except:
+    pass
+
+
+##########
+process_file( "bl.mp4", "ftp://streams.videolan.org/streams-videolan/reference/mp4", 3000 )
+process_file( "Win98Crash.mov", "ftp://streams.videolan.org/streams-videolan/reference/mov", 3000 )
+process_file( "x264.avi", "ftp://streams.videolan.org/streams-videolan/reference/avi", 3000 )
+process_file( "batidadomontoya.wmv", "ftp://streams.videolan.org/streams-videolan/reference/asf", 3000 )
+process_file( "tarzan.ogm", "ftp://streams.videolan.org/streams-videolan/reference/ogm", 3000 )
+