111 lines
2.9 KiB
V
111 lines
2.9 KiB
V
module metadata
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import os { File }
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import encoding.iconv
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import utils
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// Определить кодировку utf-8 или cp-1251
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@[inline]
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fn decode_bytes(bytes []u8) string {
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format := if utils.is_utf8(bytes) { "UTF-8" } else { "CP1251" }
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text := iconv.encoding_to_vstring(bytes, format) or { "Can't decode" }
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return text
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}
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// Извлечение метаданных из ID3 v1
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pub fn (mut tag ID3v1) get_metadata(last_bytes []u8) {
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tag.title = decode_bytes(last_bytes[3..33])
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tag.artist = decode_bytes(last_bytes[33..63])
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tag.album = decode_bytes(last_bytes[63..92])
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tag.year = decode_bytes(last_bytes[93..97])
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tag.comment = decode_bytes(last_bytes[97..125])
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tag.track = if last_bytes[125] == u8(0) {last_bytes[126].str()} else { "" }
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genre := Genre.from(last_bytes[127..128][0]) or { Genre.unknown }
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tag.genre = genre.str()}
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// Конвертировать ID3 v2.3 в ID3 v1
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pub fn (id3v1 ID3v1) to_v23() ID3v23 {
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return ID3v23{
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tcon: metadata.Frame{
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text: id3v1.genre
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}
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tit2: metadata.Frame{
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text: id3v1.title
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}
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tpe2: metadata.Frame{
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text: id3v1.artist
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}
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talb: metadata.Frame{
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text: id3v1.album
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}
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trck: metadata.Frame{
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text: id3v1.track
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}
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tyer: metadata.Frame{
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text: id3v1.year
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}
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comment: metadata.Frame{
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text: id3v1.comment
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}
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}
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}
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// По ситуации отрезаем или добиваем нулями
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@[inline]
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fn cut_or_trim(data string, capacity i8) []u8 {
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mut final_data := []u8{len: capacity, init: 0}
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bytes_data := iconv.vstring_to_encoding(data, "CP1251") or { []u8{len: capacity} }
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diff := capacity - bytes_data.len
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if diff > 0 {
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for i, d in bytes_data {
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final_data[i] = d
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}
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} else {
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final_data = bytes_data.clone()[..capacity]
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}
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return final_data
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}
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// Перевести тэг в байты
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pub fn (id3v1 ID3v1) to_bytes() []u8 {
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mut bytes := []u8{cap: 128}
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bytes << "TAG".bytes()
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bytes << cut_or_trim(id3v1.title, i8(30))
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bytes << cut_or_trim(id3v1.artist, i8(30))
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bytes << cut_or_trim(id3v1.album, i8(30))
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bytes << cut_or_trim(id3v1.year, i8(4))
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bytes << cut_or_trim(id3v1.comment, i8(28))
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// bytes << cut_or_trim(id3v1.track, i8(2))
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bytes << if id3v1.track.len != 0 { [u8(0), id3v1.track.u8()]} else { [u8(1), u8(0)] }
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id_genre := Genre.from(id3v1.genre) or { Genre.unknown }
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bytes << u8(id_genre) // cut_or_trim([u8(id_genre)], i8(2))
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return bytes
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}
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// Добавление изменённого тэга
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pub fn (id3v1 ID3v1) insert(mut audio File, position i8) []u8 {
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bytes_tag := id3v1.to_bytes()
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// Уcтановка указателя на последний байт
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audio.seek(0, os.SeekMode.end) or { panic(err) }
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// Положение указателя
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size := audio.tell() or { panic(err) }
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// Чтение всех байта, кроме последних 128
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mut all_bytes := audio.read_bytes(int(size))#[..position]
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all_bytes << bytes_tag
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return all_bytes
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}
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