mirror of
https://github.com/beetbox/beets.git
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330 lines
11 KiB
Python
330 lines
11 KiB
Python
# This file is part of beets.
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# Copyright 2013, Jakob Schnitzer.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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"""Converts tracks or albums to external directory
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"""
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import logging
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import os
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import threading
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import subprocess
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import tempfile
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from string import Template
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import pipes
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from beets import ui, util, plugins, config
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from beets.plugins import BeetsPlugin
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from beetsplug.embedart import _embed
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log = logging.getLogger('beets')
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_fs_lock = threading.Lock()
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_temp_files = [] # Keep track of temporary transcoded files for deletion.
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# Some convenient alternate names for formats.
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ALIASES = {
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u'wma': u'windows media',
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u'vorbis': u'ogg',
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}
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def _destination(dest_dir, item, keep_new, path_formats):
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"""Return the path under `dest_dir` where the file should be placed
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(possibly after conversion).
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"""
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dest = item.destination(basedir=dest_dir, path_formats=path_formats)
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if keep_new:
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# When we're keeping the converted file, no extension munging
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# occurs.
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return dest
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else:
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# Otherwise, replace the extension.
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_, ext = get_format()
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return os.path.splitext(dest)[0] + ext
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def get_format():
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"""Get the currently configured format command and extension.
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"""
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format = config['convert']['format'].get(unicode).lower()
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format = ALIASES.get(format, format)
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format_info = config['convert']['formats'][format].get(dict)
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# Convenience and backwards-compatibility shortcuts.
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keys = config['convert'].keys()
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if 'command' in keys:
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format_info['command'] = config['convert']['command'].get(unicode)
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elif 'opts' in keys:
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# Undocumented option for backwards compatibility with < 1.3.1.
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format_info['command'] = u'ffmpeg -i $source -y {0} $dest'.format(
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config['convert']['opts'].get(unicode)
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)
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if 'extension' in keys:
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format_info['extension'] = config['convert']['extension'].get(unicode)
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try:
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return (
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format_info['command'].encode('utf8'),
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(u'.' + format_info['extension']).encode('utf8'),
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)
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except KeyError:
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raise ui.UserError(
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u'convert: format {0} needs "command" and "extension" fields'
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.format(format)
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)
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def encode(source, dest):
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"""Encode ``source`` to ``dest`` using the command from ``get_format()``.
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Raises an ``ui.UserError`` if the command was not found and a
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``subprocess.CalledProcessError`` if the command exited with a
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non-zero status code.
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"""
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quiet = config['convert']['quiet'].get()
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if not quiet:
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log.info(u'Started encoding {0}'.format(util.displayable_path(source)))
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command, _ = get_format()
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command = Template(command).safe_substitute({
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'source': pipes.quote(source),
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'dest': pipes.quote(dest),
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})
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log.debug(u'convert: executing: {0}'
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.format(util.displayable_path(command)))
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try:
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util.command_output(command, shell=True)
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except subprocess.CalledProcessError:
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# Something went wrong (probably Ctrl+C), remove temporary files
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log.info(u'Encoding {0} failed. Cleaning up...'
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.format(util.displayable_path(source)))
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util.remove(dest)
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util.prune_dirs(os.path.dirname(dest))
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raise
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except OSError as exc:
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raise ui.UserError(
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u'convert: could invoke ffmpeg: {0}'.format(exc)
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)
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if not quiet:
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log.info(u'Finished encoding {0}'.format(
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util.displayable_path(source))
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)
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def should_transcode(item):
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"""Determine whether the item should be transcoded as part of
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conversion (i.e., its bitrate is high or it has the wrong format).
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"""
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maxbr = config['convert']['max_bitrate'].get(int)
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format_name = config['convert']['format'].get(unicode)
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return format_name.lower() != item.format.lower() or \
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item.bitrate >= 1000 * maxbr
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def convert_item(dest_dir, keep_new, path_formats):
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while True:
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item = yield
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dest = _destination(dest_dir, item, keep_new, path_formats)
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if os.path.exists(util.syspath(dest)):
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log.info(u'Skipping {0} (target file exists)'.format(
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util.displayable_path(item.path)
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))
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continue
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# Ensure that only one thread tries to create directories at a
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# time. (The existence check is not atomic with the directory
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# creation inside this function.)
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with _fs_lock:
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util.mkdirall(dest)
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# When keeping the new file in the library, we first move the
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# current (pristine) file to the destination. We'll then copy it
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# back to its old path or transcode it to a new path.
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if keep_new:
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log.info(u'Moving to {0}'.
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format(util.displayable_path(dest)))
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util.move(item.path, dest)
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original = dest
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_, ext = get_format()
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converted = os.path.splitext(item.path)[0] + ext
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else:
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original = item.path
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converted = dest
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if not should_transcode(item):
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# No transcoding necessary.
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log.info(u'Copying {0}'.format(util.displayable_path(item.path)))
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util.copy(original, converted)
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else:
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try:
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encode(original, converted)
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except subprocess.CalledProcessError:
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continue
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# Write tags from the database to the converted file.
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item.write(path=converted)
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if keep_new:
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# If we're keeping the transcoded file, read it again (after
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# writing) to get new bitrate, duration, etc.
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item.path = converted
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item.read()
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item.store() # Store new path and audio data.
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if config['convert']['embed']:
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album = item.get_album()
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if album:
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artpath = album.artpath
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if artpath:
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try:
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_embed(artpath, [item.path])
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except IOError as exc:
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log.warn(u'could not embed cover art in {0}: {1}'
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.format(util.displayable_path(item.path),
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exc))
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plugins.send('after_convert', item=item, dest=dest, keepnew=keep_new)
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def convert_on_import(lib, item):
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"""Transcode a file automatically after it is imported into the
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library.
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"""
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if should_transcode(item):
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_, ext = get_format()
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fd, dest = tempfile.mkstemp(ext)
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os.close(fd)
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_temp_files.append(dest) # Delete the transcode later.
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try:
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encode(item.path, dest)
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except subprocess.CalledProcessError:
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return
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item.path = dest
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item.write()
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item.read() # Load new audio information data.
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item.store()
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def convert_func(lib, opts, args):
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dest = opts.dest if opts.dest is not None else \
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config['convert']['dest'].get()
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if not dest:
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raise ui.UserError('no convert destination set')
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dest = util.bytestring_path(dest)
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threads = opts.threads if opts.threads is not None else \
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config['convert']['threads'].get(int)
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keep_new = opts.keep_new
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if not config['convert']['paths']:
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path_formats = ui.get_path_formats()
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else:
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path_formats = ui.get_path_formats(config['convert']['paths'])
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ui.commands.list_items(lib, ui.decargs(args), opts.album, None)
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if not ui.input_yn("Convert? (Y/n)"):
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return
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if opts.album:
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items = (i for a in lib.albums(ui.decargs(args)) for i in a.items())
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else:
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items = iter(lib.items(ui.decargs(args)))
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convert = [convert_item(dest, keep_new, path_formats)
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for i in range(threads)]
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pipe = util.pipeline.Pipeline([items, convert])
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pipe.run_parallel()
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class ConvertPlugin(BeetsPlugin):
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def __init__(self):
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super(ConvertPlugin, self).__init__()
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self.config.add({
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u'dest': None,
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u'threads': util.cpu_count(),
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u'format': u'mp3',
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u'formats': {
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u'aac': {
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u'command': u'ffmpeg -i $source -y -vn -acodec libfaac '
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u'-aq 100 $dest',
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u'extension': u'm4a',
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},
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u'alac': {
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u'command': u'ffmpeg -i $source -y -vn -acodec alac $dest',
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u'extension': u'm4a',
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},
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u'flac': {
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u'command': u'ffmpeg -i $source -y -vn -acodec flac $dest',
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u'extension': u'flac',
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},
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u'mp3': {
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u'command': u'ffmpeg -i $source -y -vn -aq 2 $dest',
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u'extension': u'mp3',
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},
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u'opus': {
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u'command': u'ffmpeg -i $source -y -vn -acodec libopus '
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u'-ab 96k $dest',
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u'extension': u'opus',
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},
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u'ogg': {
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u'command': u'ffmpeg -i $source -y -vn -acodec libvorbis '
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u'-aq 2 $dest',
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u'extension': u'ogg',
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},
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u'windows media': {
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u'command': u'ffmpeg -i $source -y -vn -acodec wmav2 '
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u'-vn $dest',
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u'extension': u'wma',
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},
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},
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u'max_bitrate': 500,
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u'auto': False,
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u'quiet': False,
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u'embed': True,
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u'paths': {},
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})
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self.import_stages = [self.auto_convert]
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def commands(self):
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cmd = ui.Subcommand('convert', help='convert to external location')
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cmd.parser.add_option('-a', '--album', action='store_true',
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help='choose albums instead of tracks')
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cmd.parser.add_option('-t', '--threads', action='store', type='int',
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help='change the number of threads, \
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defaults to maximum available processors')
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cmd.parser.add_option('-k', '--keep-new', action='store_true',
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dest='keep_new', help='keep only the converted \
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and move the old files')
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cmd.parser.add_option('-d', '--dest', action='store',
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help='set the destination directory')
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cmd.func = convert_func
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return [cmd]
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def auto_convert(self, config, task):
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if self.config['auto']:
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for item in task.imported_items():
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convert_on_import(config.lib, item)
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@ConvertPlugin.listen('import_task_files')
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def _cleanup(task, session):
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for path in task.old_paths:
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if path in _temp_files:
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if os.path.isfile(path):
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util.remove(path)
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_temp_files.remove(path)
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