kapsikkum-unmanic – Rev 1
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
unmanic.audio_codec_handle.py
Written by: Josh.5 <jsunnex@gmail.com>
Date: 21 Sep 2019, (7:53 AM)
Copyright:
Copyright (C) Josh Sunnex - All Rights Reserved
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
OR OTHER DEALINGS IN THE SOFTWARE.
"""
from . import audio_codecs
class AudioCodecHandle(object):
"""
AudioCodecHandle
Handle FFMPEG operations pertaining to audio codec streams
"""
def __init__(self, file_probe):
self.file_probe = file_probe
self.encoding_args = {}
self.audio_tracks_count = 0
# Configurable settings
self.disable_audio_encoding = False
self.enable_audio_stream_transcoding = False
self.audio_codec_transcoding = 'aac' # Default to aac
self.audio_encoder_transcoding = 'aac' # Default to aac
self.enable_audio_stream_stereo_cloning = False
self.audio_codec_cloning = 'aac' # Default to aac
self.audio_encoder_cloning = 'aac' # Default to aac
self.audio_stereo_stream_bitrate = '128k' # Default to 128k
def copy_stream(self, stream):
"""
Copy the audio stream. It will not be modified
:param stream:
:return:
"""
self.encoding_args['streams_to_encode'] = self.encoding_args['streams_to_encode'] + [
"-c:a:{}".format(self.audio_tracks_count), "copy"
]
# Map this stream
self.encoding_args['streams_to_map'] = self.encoding_args['streams_to_map'] + [
"-map", "0:{}".format(stream['index'])
]
self.audio_tracks_count += 1
def transcode_stream(self, stream):
"""
Transcode the audio stream to the configured audio codec
:param stream:
:return:
"""
self.encoding_args['streams_to_encode'] = self.encoding_args['streams_to_encode'] + [
"-c:a:{}".format(self.audio_tracks_count), self.audio_encoder_transcoding,
]
# Map this stream
self.encoding_args['streams_to_map'] = self.encoding_args['streams_to_map'] + [
"-map", "0:{}".format(stream['index'])
]
self.audio_tracks_count += 1
def clone_stereo_stream(self, stream):
"""
Generate a stereo clone of a given stream
:param stream:
:return:
"""
try:
audio_tag = ''.join([i for i in stream['tags']['title'] if not i.isdigit()]).rstrip(
'.') + 'Stereo'
except:
audio_tag = 'Stereo'
# Map a duplicated stream
self.encoding_args['streams_to_map'] = self.encoding_args['streams_to_map'] + [
"-map", " 0:{}".format(stream['index'])
]
self.encoding_args['streams_to_encode'] = self.encoding_args['streams_to_encode'] + [
"-c:a:{}".format(self.audio_tracks_count), self.audio_encoder_cloning,
"-b:a:{}".format(self.audio_tracks_count), self.audio_stereo_stream_bitrate,
"-ac:a:{}".format(self.audio_tracks_count), "2",
"-metadata:s:a:{}".format(self.audio_tracks_count), "title='{}'".format(audio_tag),
]
self.audio_tracks_count += 1
def args(self):
"""
Return a dictionary of streams to map and streams to encode
:return:
"""
# Read stream data
self.encoding_args['streams_to_map'] = []
self.encoding_args['streams_to_encode'] = []
for stream in self.file_probe['streams']:
# If this is a audio stream, then process the args
if stream['codec_type'] == 'audio':
if self.disable_audio_encoding:
# Audio re-encoding is disabled. Just copy the stream
self.copy_stream(stream)
else:
# Transcode stream if configured to do so
if self.enable_audio_stream_transcoding:
# If the current audio codec of this stream is the same as the configured
# destination codec, then do not re-encode this audio stream
if stream['codec_name'] == self.audio_codec_transcoding:
self.copy_stream(stream)
else:
self.transcode_stream(stream)
else:
self.copy_stream(stream)
# If we have enabled stream cloning and this stream has more than 2 channels
if self.enable_audio_stream_stereo_cloning and stream['channels'] > 2:
self.clone_stereo_stream(stream)
return self.encoding_args
def set_audio_codec_with_default_encoder_cloning(self, codec_name):
"""
Set the audio encoder for cloned streams
:return:
"""
codec = audio_codecs.grab_module(codec_name)
self.audio_codec_cloning = codec_name
self.audio_encoder_cloning = codec.codec_default_encoder()
def set_audio_codec_with_default_encoder_transcoding(self, codec_name):
"""
Set the audio encoder for transcoding streams
:return:
"""
codec = audio_codecs.grab_module(codec_name)
self.audio_codec_transcoding = codec_name
self.audio_encoder_transcoding = codec.codec_default_encoder()