Coverage for youtube_dl.PostProcessor : 14%

#!/usr/bin/env python 

# -*- coding: utf-8 -*- 

from __future__ import absolute_import 

import os 

import subprocess 

import sys 

import time 

from .utils import * 

class PostProcessor(object): 

    """Post Processor class. 

    PostProcessor objects can be added to downloaders with their 

    add_post_processor() method. When the downloader has finished a 

    successful download, it will take its internal chain of PostProcessors 

    and start calling the run() method on each one of them, first with 

    an initial argument and then with the returned value of the previous 

    PostProcessor. 

    The chain will be stopped if one of them ever returns None or the end 

    of the chain is reached. 

    PostProcessor objects follow a "mutual registration" process similar 

    to InfoExtractor objects. 

    """ 

    _downloader = None 

    def __init__(self, downloader=None): 

        self._downloader = downloader 

    def set_downloader(self, downloader): 

        """Sets the downloader for this PP.""" 

        self._downloader = downloader 

    def run(self, information): 

        """Run the PostProcessor. 

        The "information" argument is a dictionary like the ones 

        composed by InfoExtractors. The only difference is that this 

        one has an extra field called "filepath" that points to the 

        downloaded file. 

        When this method returns None, the postprocessing chain is 

        stopped. However, this method may return an information 

        dictionary that will be passed to the next postprocessing 

        object in the chain. It can be the one it received after 

        changing some fields. 

        In addition, this method may raise a PostProcessingError 

        exception that will be taken into account by the downloader 

        it was called from. 

        """ 

        return information # by default, do nothing 

class AudioConversionError(BaseException): 

    def __init__(self, message): 

        self.message = message 

class FFmpegExtractAudioPP(PostProcessor): 

    def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, keepvideo=False, nopostoverwrites=False): 

        PostProcessor.__init__(self, downloader) 

        if preferredcodec is None: 

            preferredcodec = 'best' 

        self._preferredcodec = preferredcodec 

        self._preferredquality = preferredquality 

        self._keepvideo = keepvideo 

        self._nopostoverwrites = nopostoverwrites 

        self._exes = self.detect_executables() 

    @staticmethod 

    def detect_executables(): 

        def executable(exe): 

            try: 

                subprocess.Popen([exe, '-version'], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate() 

            except OSError: 

                return False 

            return exe 

        programs = ['avprobe', 'avconv', 'ffmpeg', 'ffprobe'] 

        return dict((program, executable(program)) for program in programs) 

    def get_audio_codec(self, path): 

        if not self._exes['ffprobe'] and not self._exes['avprobe']: return None 

        try: 

            cmd = [self._exes['avprobe'] or self._exes['ffprobe'], '-show_streams', '--', encodeFilename(path)] 

            handle = subprocess.Popen(cmd, stderr=compat_subprocess_get_DEVNULL(), stdout=subprocess.PIPE) 

            output = handle.communicate()[0] 

            if handle.wait() != 0: 

                return None 

        except (IOError, OSError): 

            return None 

        audio_codec = None 

        for line in output.decode('ascii', 'ignore').split('\n'): 

            if line.startswith('codec_name='): 

                audio_codec = line.split('=')[1].strip() 

            elif line.strip() == 'codec_type=audio' and audio_codec is not None: 

                return audio_codec 

        return None 

    def run_ffmpeg(self, path, out_path, codec, more_opts): 

        if not self._exes['ffmpeg'] and not self._exes['avconv']: 

            raise AudioConversionError('ffmpeg or avconv not found. Please install one.') 

        if codec is None: 

            acodec_opts = [] 

        else: 

            acodec_opts = ['-acodec', codec] 

        cmd = ([self._exes['avconv'] or self._exes['ffmpeg'], '-y', '-i', encodeFilename(path), '-vn'] 

               + acodec_opts + more_opts + 

               ['--', encodeFilename(out_path)]) 

        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE) 

        stdout,stderr = p.communicate() 

        if p.returncode != 0: 

            msg = stderr.strip().split('\n')[-1] 

            raise AudioConversionError(msg) 

    def run(self, information): 

        path = information['filepath'] 

        filecodec = self.get_audio_codec(path) 

        if filecodec is None: 

            self._downloader.to_stderr(u'WARNING: unable to obtain file audio codec with ffprobe') 

            return None 

        more_opts = [] 

        if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'): 

            if self._preferredcodec == 'm4a' and filecodec == 'aac': 

                # Lossless, but in another container 

                acodec = 'copy' 

                extension = self._preferredcodec 

                more_opts = [self._exes['avconv'] and '-bsf:a' or '-absf', 'aac_adtstoasc'] 

            elif filecodec in ['aac', 'mp3', 'vorbis']: 

                # Lossless if possible 

                acodec = 'copy' 

                extension = filecodec 

                if filecodec == 'aac': 

                    more_opts = ['-f', 'adts'] 

                if filecodec == 'vorbis': 

                    extension = 'ogg' 

            else: 

                # MP3 otherwise. 

                acodec = 'libmp3lame' 

                extension = 'mp3' 

                more_opts = [] 

                if self._preferredquality is not None: 

                    if int(self._preferredquality) < 10: 

                        more_opts += [self._exes['avconv'] and '-q:a' or '-aq', self._preferredquality] 

                    else: 

                        more_opts += [self._exes['avconv'] and '-b:a' or '-ab', self._preferredquality + 'k'] 

        else: 

            # We convert the audio (lossy) 

            acodec = {'mp3': 'libmp3lame', 'aac': 'aac', 'm4a': 'aac', 'vorbis': 'libvorbis', 'wav': None}[self._preferredcodec] 

            extension = self._preferredcodec 

            more_opts = [] 

            if self._preferredquality is not None: 

                if int(self._preferredquality) < 10: 

                    more_opts += [self._exes['avconv'] and '-q:a' or '-aq', self._preferredquality] 

                else: 

                    more_opts += [self._exes['avconv'] and '-b:a' or '-ab', self._preferredquality + 'k'] 

            if self._preferredcodec == 'aac': 

                more_opts += ['-f', 'adts'] 

            if self._preferredcodec == 'm4a': 

                more_opts += [self._exes['avconv'] and '-bsf:a' or '-absf', 'aac_adtstoasc'] 

            if self._preferredcodec == 'vorbis': 

                extension = 'ogg' 

            if self._preferredcodec == 'wav': 

                extension = 'wav' 

                more_opts += ['-f', 'wav'] 

        prefix, sep, ext = path.rpartition(u'.') # not os.path.splitext, since the latter does not work on unicode in all setups 

        new_path = prefix + sep + extension 

        try: 

            if self._nopostoverwrites and os.path.exists(encodeFilename(new_path)): 

                self._downloader.to_screen(u'[youtube] Post-process file %s exists, skipping' % new_path) 

            else: 

                self._downloader.to_screen(u'[' + (self._exes['avconv'] and 'avconv' or 'ffmpeg') + '] Destination: ' + new_path) 

                self.run_ffmpeg(path, new_path, acodec, more_opts) 

        except: 

            etype,e,tb = sys.exc_info() 

            if isinstance(e, AudioConversionError): 

                self._downloader.to_stderr(u'ERROR: audio conversion failed: ' + e.message) 

            else: 

                self._downloader.to_stderr(u'ERROR: error running ' + (self._exes['avconv'] and 'avconv' or 'ffmpeg')) 

            return None 

        # Try to update the date time for extracted audio file. 

        if information.get('filetime') is not None: 

            try: 

                os.utime(encodeFilename(new_path), (time.time(), information['filetime'])) 

            except: 

                self._downloader.to_stderr(u'WARNING: Cannot update utime of audio file') 

        if not self._keepvideo: 

            try: 

                os.remove(encodeFilename(path)) 

            except (IOError, OSError): 

                self._downloader.to_stderr(u'WARNING: Unable to remove downloaded video file') 

                return None 

        information['filepath'] = new_path 

        return information