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Add metadata read/write support to ISOBMFF, add more metadata fields, add raw metadata support

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This commit is contained in:
Vanilagy
2025-09-04 21:28:23 +02:00
parent 7f310eccdf
commit efa933863d
9 changed files with 967 additions and 174 deletions
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src/mp3/mp3-reader.ts
+37 -20
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@@ -65,21 +65,6 @@ export const ID3_V1_GENRES = [
'Dubstep', 'Garage rock', 'Psybient',
];
/*
export const readId3 = (slice: FileSlice) => {
const tag = readAscii(slice, 3);
if (tag !== 'ID3') {
slice.skip(-3);
return null;
}
slice.skip(3);
const size = decodeSynchsafe(readU32Be(slice));
return { size };
};
*/
export const readNextFrameHeader = async (reader: Reader, startPos: number, until: number | null): Promise<{
header: FrameHeader;
startPos: number;
@@ -105,6 +90,11 @@ export const readNextFrameHeader = async (reader: Reader, startPos: number, unti
};
export const parseId3V1Tag = (slice: FileSlice, metadata: MediaMetadata) => {
const startPos = slice.filePos;
metadata.raw ??= {};
metadata.raw['TAG'] = readBytes(slice, ID3_V1_TAG_SIZE - 3); // Dump the whole tag into the raw metadata
slice.filePos = startPos;
const title = readId3V1String(slice, 30);
if (title) metadata.title ??= title;
@@ -117,7 +107,7 @@ export const parseId3V1Tag = (slice: FileSlice, metadata: MediaMetadata) => {
const yearText = readId3V1String(slice, 4);
const year = Number.parseInt(yearText, 10);
if (Number.isInteger(year) && year > 0) {
metadata.releasedAt ??= new Date(year, 0, 1);
metadata.date ??= new Date(year, 0, 1);
}
const commentBytes = readBytes(slice, 30);
@@ -216,6 +206,7 @@ export const parseId3V2Tag = (slice: FileSlice, header: Id3V2Header, metadata: M
break;
}
const frameStartPos = reader.pos;
const frameEndPos = reader.pos + frame.size;
let frameEncrypted = false;
@@ -248,12 +239,28 @@ export const parseId3V2Tag = (slice: FileSlice, header: Id3V2Header, metadata: M
reader.ununsynchronizeRegion(reader.pos, frameEndPos);
}
metadata.raw ??= {};
if (frame.id[0] === 'T') {
// It's a text frame, let's decode as text
metadata.raw[frame.id] = reader.readId3V2EncodingAndText(frameEndPos);
} else {
// For the others, let's just get the bytes
metadata.raw[frame.id] = reader.readBytes(frame.size);
}
reader.pos = frameStartPos;
switch (frame.id) {
case 'TIT2':
case 'TT2': {
metadata.title ??= reader.readId3V2EncodingAndText(frameEndPos);
}; break;
case 'TIT3':
case 'TT3': {
metadata.description ??= reader.readId3V2EncodingAndText(frameEndPos);
}; break;
case 'TPE1':
case 'TP1': {
metadata.artist ??= reader.readId3V2EncodingAndText(frameEndPos);
@@ -272,21 +279,31 @@ export const parseId3V2Tag = (slice: FileSlice, header: Id3V2Header, metadata: M
case 'TRCK':
case 'TRK': {
const trackText = reader.readId3V2EncodingAndText(frameEndPos);
const trackNum = Number.parseInt(trackText, 10);
const parts = trackText.split('/');
const trackNum = Number.parseInt(parts[0]!, 10);
const trackNumMax = parts[1] && Number.parseInt(parts[1], 10);
if (Number.isInteger(trackNum) && trackNum > 0) {
metadata.trackNumber ??= trackNum;
}
if (trackNumMax && Number.isInteger(trackNumMax) && trackNumMax > 0) {
metadata.trackNumberMax ??= trackNumMax;
}
}; break;
case 'TPOS':
case 'TPA': {
const discText = reader.readId3V2EncodingAndText(frameEndPos);
const discNum = Number.parseInt(discText, 10);
const parts = discText.split('/');
const discNum = Number.parseInt(parts[0]!, 10);
const discNumMax = parts[1] && Number.parseInt(parts[1], 10);
if (Number.isInteger(discNum) && discNum > 0) {
metadata.discNumber ??= discNum;
}
if (discNumMax && Number.isInteger(discNumMax) && discNumMax > 0) {
metadata.discNumberMax ??= discNumMax;
}
}; break;
case 'TCON':
@@ -319,7 +336,7 @@ export const parseId3V2Tag = (slice: FileSlice, header: Id3V2Header, metadata: M
const date = new Date(dateText);
if (!Number.isNaN(date.getTime())) {
metadata.releasedAt ??= date;
metadata.date ??= date;
}
}; break;
@@ -329,7 +346,7 @@ export const parseId3V2Tag = (slice: FileSlice, header: Id3V2Header, metadata: M
const year = Number.parseInt(yearText, 10);
if (Number.isInteger(year)) {
metadata.releasedAt ??= new Date(year, 0, 1);
metadata.date ??= new Date(year, 0, 1);
}
}; break;