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Write disc number metadata for FLAC and M4A downloads

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This commit is contained in:
Julien Maille 2026-02-21 23:52:33 +01:00
parent 91ecca534b
commit 400197aabc
1 changed files with 28 additions and 11 deletions
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39
js/metadata.js
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@ -544,6 +544,7 @@ function parseFlacBlocks(dataView) {
function createVorbisCommentBlock(track) {
// Vorbis comment structure
const comments = [];
const discNumber = track.volumeNumber ?? track.discNumber;
// Add standard tags
if (track.title) {
@ -562,6 +563,9 @@ function createVorbisCommentBlock(track) {
if (track.trackNumber) {
comments.push(['TRACKNUMBER', String(track.trackNumber)]);
}
if (discNumber) {
comments.push(['DISCNUMBER', String(discNumber)]);
}
if (track.album?.numberOfTracks) {
comments.push(['TRACKTOTAL', String(track.album.numberOfTracks)]);
}
@ -920,7 +924,18 @@ function createMp4MetadataAtoms(track) {
}
if (track.trackNumber) {
tags['trkn'] = track.trackNumber;
tags['trkn'] = {
current: track.trackNumber,
total: track.album?.numberOfTracks,
};
}
const discNumber = track.volumeNumber ?? track.discNumber;
if (discNumber) {
tags['disk'] = {
current: discNumber,
total: 0,
};
}
const releaseDateStr =
@ -1055,7 +1070,7 @@ function createMetadataBlock(metadataAtoms) {
// Text tags
for (const [key, value] of Object.entries(tags)) {
if (key === 'trkn') {
if (key === 'trkn' || key === 'disk') {
ilstChildren.push(createIntAtom(key, value));
} else {
ilstChildren.push(createStringAtom(key, value));
@ -1190,7 +1205,7 @@ function createStringAtom(type, value) {
}
function createIntAtom(type, value) {
// trkn is special: data is 8 bytes.
// trkn/disk are special: data is 8 bytes.
// reserved(2) + track(2) + total(2) + reserved(2)
const dataSize = 16 + 8;
const atomSize = 8 + dataSize;
@ -1214,16 +1229,18 @@ function createIntAtom(type, value) {
buf[offset++] = 0;
buf[offset++] = 0;
// Track data
buf[offset++] = 0;
buf[offset++] = 0;
// Track num
const trk = parseInt(value) || 0;
buf[offset++] = (trk >> 8) & 0xff;
buf[offset++] = trk & 0xff;
// Total (0 for now)
const current = typeof value === 'object' ? value.current : value;
const total = typeof value === 'object' ? value.total : 0;
// Numbering payload (track/disc number + total)
buf[offset++] = 0;
buf[offset++] = 0;
const numberValue = parseInt(current, 10) || 0;
buf[offset++] = (numberValue >> 8) & 0xff;
buf[offset++] = numberValue & 0xff;
const totalValue = parseInt(total, 10) || 0;
buf[offset++] = (totalValue >> 8) & 0xff;
buf[offset++] = totalValue & 0xff;
buf[offset++] = 0;
buf[offset++] = 0;