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Implement MP3 metadata (ID3v1/2) read & write

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This commit is contained in:
Vanilagy
2025-08-25 17:43:40 +02:00
parent 72eb54391e
commit fb0c41aa09
13 changed files with 1014 additions and 51 deletions
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src/mp3/mp3-writer.ts
+107
View File
@@ -6,9 +6,11 @@
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
import { isIso88591Compatible, textEncoder } from '../misc';
import { Writer } from '../writer';
import {
computeMp3FrameSize,
encodeSynchsafe,
getXingOffset,
MPEG_V1_BITRATES,
MPEG_V2_BITRATES,
@@ -37,11 +39,116 @@ export class Mp3Writer {
constructor(private writer: Writer) {}
writeU8(value: number) {
this.helper[0] = value;
this.writer.write(this.helper.subarray(0, 1));
}
writeU16(value: number) {
this.helperView.setUint16(0, value, false);
this.writer.write(this.helper.subarray(0, 2));
}
writeU32(value: number) {
this.helperView.setUint32(0, value, false);
this.writer.write(this.helper.subarray(0, 4));
}
writeAscii(text: string) {
for (let i = 0; i < text.length; i++) {
this.helper[i] = text.charCodeAt(i);
}
this.writer.write(this.helper.subarray(0, text.length));
}
writeSynchsafeU32(value: number) {
this.writeU32(encodeSynchsafe(value));
}
writeIsoString(text: string) {
const bytes = new Uint8Array(text.length + 1);
for (let i = 0; i < text.length; i++) {
bytes[i] = text.charCodeAt(i);
}
bytes[text.length] = 0x00;
this.writer.write(bytes);
}
writeUtf8String(text: string) {
const utf8Data = textEncoder.encode(text);
this.writer.write(utf8Data);
this.writeU8(0x00);
}
writeId3V2TextFrame(frameId: string, text: string) {
const useIso88591 = isIso88591Compatible(text);
const textDataLength = useIso88591 ? text.length : textEncoder.encode(text).byteLength;
const frameSize = 1 + textDataLength + 1;
this.writeAscii(frameId);
this.writeSynchsafeU32(frameSize);
this.writeU16(0x0000);
this.writeU8(useIso88591 ? 0x00 : 0x03);
if (useIso88591) {
this.writeIsoString(text);
} else {
this.writeUtf8String(text);
}
}
writeId3V2CommentFrame(comment: string) {
const useIso88591 = isIso88591Compatible(comment);
const textDataLength = useIso88591 ? comment.length : textEncoder.encode(comment).byteLength;
const frameSize = 1 + 3 + 1 + textDataLength + 1;
const shortDescription = '';
this.writeAscii('COMM');
this.writeSynchsafeU32(frameSize);
this.writeU16(0x0000);
this.writeU8(useIso88591 ? 0x00 : 0x03);
this.writeU8(0x75); // 'u'
this.writeU8(0x6E); // 'n'
this.writeU8(0x64); // 'd'
if (useIso88591) {
this.writeIsoString(shortDescription);
this.writeIsoString(comment);
} else {
this.writeUtf8String(shortDescription);
this.writeUtf8String(comment);
}
}
writeId3V2ApicFrame(mimeType: string, pictureType: number, description: string, imageData: Uint8Array) {
const useIso88591 = isIso88591Compatible(mimeType) && isIso88591Compatible(description);
const descriptionDataLength = useIso88591 ? description.length : textEncoder.encode(description).byteLength;
const frameSize = 1 + mimeType.length + 1 + 1 + descriptionDataLength + 1 + imageData.byteLength;
this.writeAscii('APIC');
this.writeSynchsafeU32(frameSize);
this.writeU16(0x0000);
this.writeU8(useIso88591 ? 0x00 : 0x03);
if (useIso88591) {
this.writeIsoString(mimeType);
} else {
this.writeUtf8String(mimeType);
}
this.writeU8(pictureType);
if (useIso88591) {
this.writeIsoString(description);
} else {
this.writeUtf8String(description);
}
this.writer.write(imageData);
}
writeXingFrame(data: XingFrameData) {
const startPos = this.writer.getPos();