.files/bin/xconv

#!/usr/bin/python3
"""
xconv ffpmeg wrapper based on AdvancedAV
-----------------------------------------------------------
    AdvancedAV helps with constructing FFmpeg commandline arguments.

    It can automatically parse input files with the help of FFmpeg's ffprobe tool (WiP)
    and allows programatically mapping streams to output files and setting metadata on them.
-----------------------------------------------------------
    Copyright (c) 2015 Taeyeon Mori

    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/>.
"""

from advancedav import SimpleAV

from argparse import ArgumentParser
from abc import ABCMeta, abstractmethod
from itertools import chain
from os.path import isdir, join as build_path, basename, splitext, exists

# == Profile Decorators ==
profiles = {}


def profile(f):
    profiles[f.__name__] = f
    return f


def output(container="matroska", ext="mkv"):
    def output(f):
        f.container = container
        f.ext = ext
        return f
    return output


# == Profile definitions ==
@profile
@output(container="matroska", ext="mkv")
def laptop(task):
    # enable experimental aac codec
    task.options["strict"] = "-2"
    # add first video stream
    for s in task.iter_video_streams():
        os = task.map_stream(s)
        os.options["codec"] = "libx264"
        os.options["vf"] = "scale='if(gt(a,16/10),1280,-1)':'if(gt(a,16/10),-1,800)'" # scale to 1280x800, keeping the aspect ratio
        os.options["tune"] = "fastdecode", "animation"
        os.options["profile"] = "main"
        os.options["preset"] = "fast"
        break
    # Add all audio streams (reencode to aac if necessary)
    for s in task.iter_audio_streams():
        os = task.map_stream(s)
        if s.codec != "aac":
            os.options["codec"] = "aac"
    # add all subtitle and attachment streams
    for s in chain(task.iter_subtitle_streams(), task.iter_attachment_streams()):
        os = task.map_stream(s)
    # go
    return True


# == Support code ==
def parse_args(argv):
    parser = ArgumentParser(prog=argv[0])
    files = parser.add_argument_group("Files")
    files.add_argument("inputs", nargs="+", help="The input file(s)")
    files.add_argument("output", help="The output filename or directory")
    parser.add_argument("-p", "--profile", choices=profiles.keys(), required=True, help="Specify the profile. See the source code.")
    parser.add_argument("-m", "--merge", help="Merge streams from all inputs instead of mapping each input to an output", action="store_true")
    parser.add_argument("-u", "--update", help="Only work on files that don't already exist", action="store_true")
    progs = parser.add_argument_group("Programs")
    progs.add_argument("--ffmpeg", default="ffmpeg", help="Path to the ffmpeg executable")
    progs.add_argument("--ffprobe", default="ffprobe", help="Path to the ffprobe executable")
    return parser.parse_args(argv[1:])


def make_outfile(args, infile):
    if args.genout:
        if hasattr(args.profile, "ext"):
            return build_path(args.output, ".".join((splitext(basename(infile))[0], args.profile.ext)))
        else:
            return build_path(args.output, basename(infile))
    else:
        return args.output


def main(argv):
    import logging
    logging.basicConfig(level=logging.DEBUG)

    args = parse_args(argv)

    args.profile = profiles[args.profile]

    args.genout = isdir(args.output)
    if not args.genout:
        if len(args.inputs) > 1:
            print("Output path '%s' is not a directory." % args.output)
            return -1

    aav = SimpleAV(ffmpeg=args.ffmpeg, ffprobe=args.ffprobe)

    tasks = []

    if args.merge:
        task = aav.create_job(make_outfile(args, args.inputs[0]))

        for input in args.inputs:
            task.add_input(input)

        tasks.append(task)

    else:
        for input in args.inputs:
            out = make_outfile(args, input)
            if args.update and exists(out):
                continue
            task = aav.create_job(out, args.profile.container if hasattr(args.profile, "container") else None)
            task.add_input(input)
            tasks.append(task)

    for task in tasks:
        if not args.profile(task):
            print("Failed to apply profile for '%s'" % basename(task.name))
            return 1

    for task in tasks:
        task.commit()

    return 0


if __name__ == "__main__":
    import sys
    sys.exit(main(sys.argv))