audiotranscoder

#!/usr/bin/python3
"""
audiotranscode
Copyright (c) 2013 Tom Wallroth

Sources on github:
  http://github.com/devsnd/audiotranscode/

licensed under GNU GPL version 3 (or later)

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>
"""

import audiotranscode
import sys
import os

EXE = os.path.basename(__file__)

USAGE_TEXT = """audiotranscode version %s

usage:

    %s [-b BITRATE] <input> <output>
    %s -h | --help
    %s --codecs
""" % (audiotranscode.__version__, EXE, EXE, EXE)

HELP_TEXT = """
    %s [-b BITRATE] <input> <output>

bitrate is specified in kbits/s
<input> is the path to the file that needs to be transcoded
<output> is the output path. The file extension of the output determines
the new file format

    %s -h | --help

shows this help text

    %s --codecs

shows all installed codecs

""" % (EXE, EXE, EXE)


def usage():
    """print usage string"""

    print(USAGE_TEXT)
    sys.exit(1)


def list_codecs():
    """list all available encoders and decoders on the command line"""

    transcode = audiotranscode.AudioTranscode()
    row_format = "{:>10}" * 3
    print('Encoders:')
    print(row_format.format('ENCODER', 'INSTALLED', 'FILETYPE'))
    for enc in transcode.Encoders:
        avail = 'yes' if enc.available() else 'no'
        print(row_format.format(enc.command[0], avail, enc.filetype))

    print('Decoders:')
    print(row_format.format('ENCODER', 'INSTALLED', 'FILETYPE'))
    for dec in transcode.Decoders:
        avail = 'yes' if dec.available() else 'no'
        print(row_format.format(dec.command[0], avail, dec.filetype))

if len(sys.argv) == 1:
    usage()

if '-h' in sys.argv or '--help' in sys.argv:
    print(HELP_TEXT)
    sys.exit(0)

if '--codecs' in sys.argv:
    list_codecs()
    sys.exit(0)

BITRATE = None
if '-b' in sys.argv:
    if not len(sys.argv) == 5:
        print('wrong number of arguments')
        usage()
    try:
        BITRATE = int(sys.argv[sys.argv.index['-b']+1])
    except ValueError:
        print('bitrate must be a number')
        usage()
else:
    if not len(sys.argv) == 3:
        print('wrong number of arguments')
        usage()
IN_FILE = sys.argv[-2]
OUT_FILE = sys.argv[-1]

TRANSCODER = audiotranscode.AudioTranscode()
try:
    TRANSCODER.transcode(IN_FILE, OUT_FILE, BITRATE)
except audiotranscode.TranscodeError as exc:
    print(exc)
    print('try the --codecs switch to see all installed codecs')
except IOError as exc:
    print(exc)