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201 lines
8.2 KiB
Python
201 lines
8.2 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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from __future__ import absolute_import
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import os
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import subprocess
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import sys
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import time
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from .utils import *
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class PostProcessor(object):
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"""Post Processor class.
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PostProcessor objects can be added to downloaders with their
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add_post_processor() method. When the downloader has finished a
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successful download, it will take its internal chain of PostProcessors
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and start calling the run() method on each one of them, first with
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an initial argument and then with the returned value of the previous
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PostProcessor.
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The chain will be stopped if one of them ever returns None or the end
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of the chain is reached.
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PostProcessor objects follow a "mutual registration" process similar
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to InfoExtractor objects.
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"""
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_downloader = None
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def __init__(self, downloader=None):
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self._downloader = downloader
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def set_downloader(self, downloader):
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"""Sets the downloader for this PP."""
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self._downloader = downloader
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def run(self, information):
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"""Run the PostProcessor.
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The "information" argument is a dictionary like the ones
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composed by InfoExtractors. The only difference is that this
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one has an extra field called "filepath" that points to the
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downloaded file.
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When this method returns None, the postprocessing chain is
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stopped. However, this method may return an information
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dictionary that will be passed to the next postprocessing
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object in the chain. It can be the one it received after
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changing some fields.
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In addition, this method may raise a PostProcessingError
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exception that will be taken into account by the downloader
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it was called from.
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"""
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return information # by default, do nothing
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class AudioConversionError(BaseException):
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def __init__(self, message):
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self.message = message
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class FFmpegExtractAudioPP(PostProcessor):
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def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, keepvideo=False):
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PostProcessor.__init__(self, downloader)
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if preferredcodec is None:
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preferredcodec = 'best'
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self._preferredcodec = preferredcodec
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self._preferredquality = preferredquality
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self._keepvideo = keepvideo
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self._exes = self.detect_executables()
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@staticmethod
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def detect_executables():
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def executable(exe):
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try:
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subprocess.Popen([exe, '-version'], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
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except OSError:
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return False
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return exe
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programs = ['avprobe', 'avconv', 'ffmpeg', 'ffprobe']
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return dict((program, executable(program)) for program in programs)
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def get_audio_codec(self, path):
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if not self._exes['ffprobe'] and not self._exes['avprobe']: return None
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try:
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cmd = [self._exes['avprobe'] or self._exes['ffprobe'], '-show_streams', '--', encodeFilename(path)]
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handle = subprocess.Popen(cmd, stderr=file(os.path.devnull, 'w'), stdout=subprocess.PIPE)
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output = handle.communicate()[0]
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if handle.wait() != 0:
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return None
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except (IOError, OSError):
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return None
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audio_codec = None
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for line in output.split('\n'):
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if line.startswith('codec_name='):
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audio_codec = line.split('=')[1].strip()
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elif line.strip() == 'codec_type=audio' and audio_codec is not None:
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return audio_codec
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return None
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def run_ffmpeg(self, path, out_path, codec, more_opts):
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if not self._exes['ffmpeg'] and not self._exes['avconv']:
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raise AudioConversionError('ffmpeg or avconv not found. Please install one.')
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if codec is None:
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acodec_opts = []
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else:
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acodec_opts = ['-acodec', codec]
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cmd = ([self._exes['avconv'] or self._exes['ffmpeg'], '-y', '-i', encodeFilename(path), '-vn']
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+ acodec_opts + more_opts +
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['--', encodeFilename(out_path)])
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout,stderr = p.communicate()
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if p.returncode != 0:
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msg = stderr.strip().split('\n')[-1]
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raise AudioConversionError(msg)
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def run(self, information):
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path = information['filepath']
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filecodec = self.get_audio_codec(path)
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if filecodec is None:
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self._downloader.to_stderr(u'WARNING: unable to obtain file audio codec with ffprobe')
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return None
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more_opts = []
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if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'):
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if self._preferredcodec == 'm4a' and filecodec == 'aac':
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# Lossless, but in another container
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acodec = 'copy'
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extension = self._preferredcodec
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more_opts = [self._exes['avconv'] and '-bsf:a' or '-absf', 'aac_adtstoasc']
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elif filecodec in ['aac', 'mp3', 'vorbis']:
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# Lossless if possible
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acodec = 'copy'
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extension = filecodec
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if filecodec == 'aac':
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more_opts = ['-f', 'adts']
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if filecodec == 'vorbis':
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extension = 'ogg'
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else:
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# MP3 otherwise.
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acodec = 'libmp3lame'
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extension = 'mp3'
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more_opts = []
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if self._preferredquality is not None:
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if int(self._preferredquality) < 10:
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more_opts += [self._exes['avconv'] and '-q:a' or '-aq', self._preferredquality]
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else:
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more_opts += [self._exes['avconv'] and '-b:a' or '-ab', self._preferredquality + 'k']
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else:
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# We convert the audio (lossy)
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acodec = {'mp3': 'libmp3lame', 'aac': 'aac', 'm4a': 'aac', 'vorbis': 'libvorbis', 'wav': None}[self._preferredcodec]
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extension = self._preferredcodec
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more_opts = []
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if self._preferredquality is not None:
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if int(self._preferredquality) < 10:
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more_opts += [self._exes['avconv'] and '-q:a' or '-aq', self._preferredquality]
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else:
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more_opts += [self._exes['avconv'] and '-b:a' or '-ab', self._preferredquality + 'k']
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if self._preferredcodec == 'aac':
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more_opts += ['-f', 'adts']
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if self._preferredcodec == 'm4a':
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more_opts += [self._exes['avconv'] and '-bsf:a' or '-absf', 'aac_adtstoasc']
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if self._preferredcodec == 'vorbis':
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extension = 'ogg'
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if self._preferredcodec == 'wav':
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extension = 'wav'
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more_opts += ['-f', 'wav']
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prefix, sep, ext = path.rpartition(u'.') # not os.path.splitext, since the latter does not work on unicode in all setups
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new_path = prefix + sep + extension
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self._downloader.to_screen(u'[' + (self._exes['avconv'] and 'avconv' or 'ffmpeg') + '] Destination: ' + new_path)
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try:
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self.run_ffmpeg(path, new_path, acodec, more_opts)
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except:
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etype,e,tb = sys.exc_info()
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if isinstance(e, AudioConversionError):
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self._downloader.to_stderr(u'ERROR: audio conversion failed: ' + e.message)
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else:
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self._downloader.to_stderr(u'ERROR: error running ' + (self._exes['avconv'] and 'avconv' or 'ffmpeg'))
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return None
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# Try to update the date time for extracted audio file.
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if information.get('filetime') is not None:
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try:
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os.utime(encodeFilename(new_path), (time.time(), information['filetime']))
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except:
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self._downloader.to_stderr(u'WARNING: Cannot update utime of audio file')
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if not self._keepvideo:
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try:
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os.remove(encodeFilename(path))
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except (IOError, OSError):
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self._downloader.to_stderr(u'WARNING: Unable to remove downloaded video file')
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return None
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information['filepath'] = new_path
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return information
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