79 lines
2.8 KiB
JavaScript
79 lines
2.8 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.IdentificationHeader = exports.CommonHeader = exports.VorbisPictureToken = void 0;
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const Token = require("token-types");
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const ID3v2Token_1 = require("../../id3v2/ID3v2Token");
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/**
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* Parse the METADATA_BLOCK_PICTURE
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* Ref: https://wiki.xiph.org/VorbisComment#METADATA_BLOCK_PICTURE
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* Ref: https://xiph.org/flac/format.html#metadata_block_picture
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* // ToDo: move to ID3 / APIC?
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*/
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class VorbisPictureToken {
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static fromBase64(base64str) {
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return this.fromBuffer(Buffer.from(base64str, 'base64'));
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}
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static fromBuffer(buffer) {
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const pic = new VorbisPictureToken(buffer.length);
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return pic.get(buffer, 0);
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}
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constructor(len) {
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this.len = len;
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}
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get(buffer, offset) {
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const type = ID3v2Token_1.AttachedPictureType[Token.UINT32_BE.get(buffer, offset)];
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const mimeLen = Token.UINT32_BE.get(buffer, offset += 4);
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const format = buffer.toString('utf-8', offset += 4, offset + mimeLen);
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const descLen = Token.UINT32_BE.get(buffer, offset += mimeLen);
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const description = buffer.toString('utf-8', offset += 4, offset + descLen);
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const width = Token.UINT32_BE.get(buffer, offset += descLen);
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const height = Token.UINT32_BE.get(buffer, offset += 4);
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const colour_depth = Token.UINT32_BE.get(buffer, offset += 4);
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const indexed_color = Token.UINT32_BE.get(buffer, offset += 4);
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const picDataLen = Token.UINT32_BE.get(buffer, offset += 4);
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const data = Buffer.from(buffer.slice(offset += 4, offset + picDataLen));
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return {
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type,
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format,
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description,
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width,
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height,
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colour_depth,
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indexed_color,
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data
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};
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}
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}
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exports.VorbisPictureToken = VorbisPictureToken;
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/**
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* Comment header decoder
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* Ref: https://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-620004.2.1
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*/
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exports.CommonHeader = {
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len: 7,
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get: (buf, off) => {
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return {
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packetType: buf.readUInt8(off),
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vorbis: new Token.StringType(6, 'ascii').get(buf, off + 1)
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};
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}
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};
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/**
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* Identification header decoder
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* Ref: https://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-630004.2.2
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*/
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exports.IdentificationHeader = {
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len: 23,
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get: (uint8Array, off) => {
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const dataView = new DataView(uint8Array.buffer, uint8Array.byteOffset);
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return {
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version: dataView.getUint32(off + 0, true),
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channelMode: dataView.getUint8(off + 4),
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sampleRate: dataView.getUint32(off + 5, true),
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bitrateMax: dataView.getUint32(off + 9, true),
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bitrateNominal: dataView.getUint32(off + 13, true),
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bitrateMin: dataView.getUint32(off + 17, true)
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};
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}
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};
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