general refactor of code

coub-dl.py

@@ -1,5 +1,6 @@
 from subprocess import call, Popen, PIPE
 from os import listdir, remove
+from os.path import splitext
 from re import match
 from sys import argv
 from enum import Enum
@@ -12,6 +13,11 @@ class Stream(Enum):
     AUDIO = 1
     VIDEO = 2
 
+class File(Enum):
+    LIST = 1
+    LOOP = 2
+    OUTPUT = 3
+
 def getCmdStdErr(command):
     process = Popen(command, stderr=PIPE, stdout=PIPE)
     out, err = process.communicate()
@@ -28,7 +34,9 @@ def getDuration(ffprobe_output):
 
 argv.append('https://coub.com/view/aeeuu')  # TODO: remove debug line
 
-FILES = {Stream.AUDIO: 'audio', Stream.VIDEO: 'video'}
+FILES = {Stream.AUDIO: 'audio', Stream.VIDEO: 'video',
+         File.LIST: 'list.txt', File.LOOP: 'loop', File.OUTPUT: 'output.mp4'}
+OUTPUT_KEYS = [File.OUTPUT]
 URL = argv[1] if len(argv) > 0 else ''  # youtube-dl error message will be shown if ''
 
 
@@ -55,21 +63,21 @@ print(videoLen)
 longer = audioLen if audioLen > videoLen else videoLen
 shorter = audioLen if audioLen < videoLen else videoLen
 shorterFile = FILES[Stream.AUDIO] if audioLen < videoLen else FILES[Stream.VIDEO]
+FILES[File.LOOP] += splitext(shorterFile)[1]
 
 timesLoop = ceil(longer.seconds / shorter.seconds)
 
-with open('list.txt', 'w') as f:
+with open(FILES[File.LIST], 'w') as f:
     for i in range(timesLoop):
         print("file '{}'".format(shorterFile), file=f)
 
 
-call(('/usr/bin/env', 'ffmpeg', '-f', 'concat', '-i', 'list.txt', '-c', 'copy', 'loopedvideo.mp4'))
-call(('/usr/bin/env', 'ffmpeg', '-i', 'loopedvideo.mp4',
+call(('/usr/bin/env', 'ffmpeg', '-f', 'concat', '-i', FILES[File.LIST], '-c', 'copy', FILES[File.LOOP]))
+call(('/usr/bin/env', 'ffmpeg', '-i', FILES[File.LOOP],
                                 '-i', FILES[Stream.AUDIO],
                                 '-map', '0', '-map', '1',
-                                '-c', 'copy', 'output.mp4'))
+                                '-c', 'copy', FILES[File.OUTPUT]))
 
-remove(FILES[Stream.AUDIO])
-remove(FILES[Stream.VIDEO])
-remove('list.txt')
-remove('loopedvideo.mp4')
+for key in FILES:
+    if key not in OUTPUT_KEYS:
+        remove(FILES[key])