115 lines
3.7 KiB
Markdown
115 lines
3.7 KiB
Markdown
# Which "Modules" do I have
|
|
## Overview
|
|
- fetching of metadata
|
|
- creating the target paths/filenames
|
|
- fetching of the download sourced
|
|
- downloading of the mp3
|
|
- fetching of the lyrics
|
|
|
|
## Naming and Structure of Modules
|
|
- utils
|
|
- shared (equivalent to global variables and constants)
|
|
- config
|
|
- database
|
|
- some static methods that are in general usefull for me
|
|
- tagging
|
|
- song (within a class Song used to get and set the metadata of mp3 files)
|
|
- metadata
|
|
- search
|
|
- fetch
|
|
- target
|
|
- audio_source
|
|
- fetch_source
|
|
- fetch_audio
|
|
- sources
|
|
- musify
|
|
- youtube
|
|
- lyrics
|
|
- lyrics
|
|
- genius (will eventually be moved in a folder with lyric sources)
|
|
|
|
# Wrong Audio
|
|
- Crystal F - Hanging Man
|
|
|
|
# Did not found whole release
|
|
- Crystal F - Trail Mix 2 (Vollmond)
|
|
- Crystal F - Was ist blos mit Hauke los
|
|
- Psychonaut 4 - Neurasthenia (Sweet Decadence)
|
|
|
|
# Audio Formats
|
|
|
|
[Wikipedia](https://en.wikipedia.org/wiki/Audio_file_format)
|
|
|
|
> It is important to distinguish between the audio coding format, the container containing the raw audio data, and an audio codec.
|
|
|
|
## audio coding format
|
|
|
|
[Wikipedia](https://en.wikipedia.org/wiki/Audio_coding_format)
|
|
|
|
The audio coding format is a format, which tries to store audio in a minimal space, while still allowing a decent quality.
|
|
|
|
There are two types:
|
|
1. lossless compression
|
|
2. lossy compression
|
|
|
|
|
|
[Here a comperison of audio coding formats.](https://en.wikipedia.org/wiki/Comparison_of_audio_coding_formats)
|
|
|
|
The two criterias, which NEED to be met is:
|
|
1. open source
|
|
2. the encoder as well as the player need to be free to use
|
|
|
|
## container
|
|
|
|
[Wikipedia](https://en.wikipedia.org/wiki/Container_format)
|
|
|
|
A container embeddes the metadata in a file. In this case I am interested in containers regarding audio.
|
|
|
|
### considerations
|
|
|
|
Important differences between container, that I need to consider when choosing one, *cuz I only implement this shit once*, are:
|
|
1. advanced content, meaning which fields there are, for example title, length, ...
|
|
2. popularity *(the more poppular it is, the better will be the support between different software)*
|
|
3. support for different [codec features](#audio-codec) *(older codecs might not support newer frames)*
|
|
4. overhead *(different file size with different data, though this certainly is less an issue with audio)*
|
|
5. support streaming the media
|
|
|
|
These destinctions are sorted from top to bottom.
|
|
|
|
|
|
## audio codec
|
|
|
|
[Wikipedia](https://en.wikipedia.org/wiki/Audio_codec)
|
|
|
|
The audio codec is simply software/hardware, to convert audio from an [audio coding format](#audio-coding-format) to playable audio and vice versa.
|
|
|
|
# ID3
|
|
|
|
[ID3](https://en.wikipedia.org/wiki/ID3) is a metadata container format for audio. I am going for [ID3v2.4](https://en.wikipedia.org/wiki/ID3#ID3v2)
|
|
|
|
An Application can define its own types of frames.
|
|
|
|
There are standard frames for containing cover art, BPM, copyright and license, lyrics, and arbitrary text and URL data, as well as other things.
|
|
|
|
Version 2.4 of the specification prescribes that all text fields (the fields that start with a T, except for TXXX) can contain multiple values separated by a null character. The null character varies by [character encoding](https://en.wikipedia.org/wiki/Character_encoding).
|
|
|
|
[id3 fields docs](https://docs.puddletag.net/source/id3.html)
|
|
|
|
[forum](https://hydrogenaud.io/index.php/topic,51504.0.html)
|
|
> Hence, for the best possible compatibility I recommend writing ID3v2.3 tags in the ISO 8859 format.
|
|
|
|
[ID3 tag mapping](https://wiki.hydrogenaud.io/index.php?title=Foobar2000:ID3_Tag_Mapping)
|
|
|
|
## Frames
|
|
|
|
A frame Name is composed from 4 capital letters $XXXX$
|
|
|
|
The first letter of text frames is $TXXX$
|
|
|
|
---
|
|
|
|
# TODO
|
|
|
|
- Add pprint to the song objects
|
|
- DOCUMENTATION
|