This project's goal is to provide an easy way to read and write ID3 tags with a consistent input and output. The existing tools I've found require a lot of work to parse their output and work in inconsistent ways, so I'm making another one.
The main client of this project is going to be a Vim plugin: https://github.com/AndrewRadev/id3.vim. That said, there's no particular reason not to use it for whatever. I'd like to keep the tool general-purpose, so if you're looking for some specific functionality, please open a github issue.
The project is backed by the excellent id3 crate built in Rust. Really, the tag parsing and writing logic is all there -- the code here mostly just translates the data to/from JSON (though I do make some assumptions, see Quirks below).
Running the program with --help should provide a message along these lines.
``` id3-json 0.1.0
USAGE:
id3-image-json [FLAGS]
FLAGS:
-r, --read Reads tags from the file and outputs them to STDOUT as JSON.
If neither read nor write are given, will read by default.
-w, --write Write mode, expects a JSON on STDIN with valid tag values.
If also given `read`, will print the resulting tags afterwards
-V, --version Prints version information
ARGS:
The input to write to a tag should be a valid json with "title", "artist", etc as keys. The output will be a JSON object that has a "data" key and inside has all these fields set. Here's some example output, pretty-printed using the jq tool:
.sh-session
% id3-json tests/fixtures/attempt_1.mp3 | jq .
{
"data": {
"album": "Echoes From The Past",
"artist": "Christiaan Bakker",
"comment": "http://www.jamendo.com Attribution 3.0 ",
"genre": "(255)",
"title": "Elevator Music Attempt #1",
"track": null,
"year": null
}
}
Here's how we can update the title and track number, and remove the genre. The tool will print the tags after the change (because of --read):
.sh-session
% echo '{ "title": "[updated]", "track": 1, "genre": null }' | id3-json tests/fixtures/attempt_1.mp3 --write --read | jq .
{
"data": {
"album": "Echoes From The Past",
"artist": "Christiaan Bakker",
"comment": "http://www.jamendo.com Attribution 3.0 ",
"genre": null,
"title": "[updated]",
"track": 1,
"year": null
}
}
The numbers given to the "year" field in set_year seem to be i32, but for simplicity, I assume years are going to be positive numbers.
It's possible to have multiple comments with a "description", "lang", and "text". See the frame::Comment structure for details. However, at least in my personal music library, it seems almost all mp3 files contain a single comment with "" for the description. Some of them have another one that's labeled as "ID3v1 comment".
For simplicity's sake I've decided to have id3-json read and write that one comment with a description of "". All other comments should be preserved, so if anything else reads them, it should still work as expected.
Elevator Music Attempt 1 by Christian Bakker: https://www.jamendo.com/en/list/a98147/echoes-from-the-past