Basic usage

This can be used by adding rtag to your dependencies in your project's Cargo.toml.

[dependencies]
rtag = "0.3.5"

and this to your crate root:

extern crate rtag;

Example: reading and filtering

When you read a frame information, you use [Unit](metadata/enum.Unit.html).

Example: reading V1 frame.

use rtag::metadata::Unit;
use rtag::metadata::MetadataReader;

for m in MetadataReader::new("./test-resources/v1-v2.mp3").unwrap() {
    match m {
        Unit::FrameV1(frame) => {
            assert_eq!("Artist", frame.artist);
            assert_eq!("!@#$", frame.comment);
            assert_eq!("1", frame.track);
            assert_eq!("137", frame.genre);
        },
        _ => ()
    }
}

Example: reading V2 frame.

use rtag::frame::*;
use rtag::metadata::Unit;
use rtag::metadata::MetadataReader;

for m in MetadataReader::new("./test-resources/240-pcnt.mp3").unwrap() {
    match m {
        Unit::FrameV2(head, FrameBody::PCNT(frame)) => {
            assert_eq!(256, frame.counter);
        },
        _ => ()
    }
}

Example: modifying a frame.

use std::fs;
use rtag::frame::*;
use rtag::metadata::Unit;
use rtag::metadata::MetadataReader;
use rtag::metadata::MetadataWriter;

let path = "./test-resources/240.test.mp3";
fs::copy("./test-resources/240.mp3", path).unwrap();

let new_data = MetadataReader::new(path)
    .unwrap()
    .fold(Vec::new(), |mut vec, unit| {
        if let Unit::FrameV2(frame_head, frame_body) = unit {
            let new_frame_body = if let FrameBody::TALB(ref frame) = frame_body {
                let mut new_frame = frame.clone();
                new_frame.text = "Album!".to_string();
                FrameBody::TALB(new_frame)
            } else {
                frame_body.clone()
            };

            vec.push(Unit::FrameV2(frame_head, new_frame_body));
        } else {
            vec.push(unit);
        }

        vec
    });

let writer = MetadataWriter::new(path).unwrap();
let _ = writer.write(new_data, false);
let _ = fs::remove_file(path).unwrap();

Example: rewriting all the frame to version 4.

use std::fs;
use rtag::frame::*;
use rtag::metadata::Unit;
use rtag::metadata::MetadataReader;
use rtag::metadata::MetadataWriter;

let path = "./test-resources/v2.2.test.mp3";
fs::copy("./test-resources/v2.2.mp3", path).unwrap();

let frames2_2 = MetadataReader::new(path).unwrap().collect::<Vec<Unit>>();
let _ = MetadataWriter::new(path).unwrap().write(frames2_2, true);
let i = MetadataReader::new(path)
    .unwrap()
    .filter(|unit| match unit {
        &Unit::FrameV2(FrameHeader::V22(_), _) => true,
        _ => false,
    });

assert_eq!(i.count(), 0);

let i = MetadataReader::new(path)
    .unwrap()
    .filter(|unit| match unit {
        &Unit::FrameV2(FrameHeader::V24(_), _) => true,
        _ => false,
    });

assert_eq!(i.count(), 5);
let _ = fs::remove_file(path).unwrap();

Example: Looking into frame without property name of frame.

use rtag::frame::*;
use rtag::metadata::{Unit, MetadataReader};

for m in MetadataReader::new("./test-resources/240.mp3").unwrap() {
   match m {
       Unit::FrameV2(_, ref frame) => {

           let _ = frame.to_map(); // frame to map

           frame.inside(|key, value| {
               println!("{}: {}", key, value);
               
               true // continue or not
           });
       },
       _ => {}
   }
}