57 lines
2.9 KiB
JavaScript
57 lines
2.9 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.DsfParser = void 0;
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const debug_1 = require("debug");
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const AbstractID3Parser_1 = require("../id3v2/AbstractID3Parser");
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const DsfChunk_1 = require("./DsfChunk");
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const ID3v2Parser_1 = require("../id3v2/ID3v2Parser");
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const debug = (0, debug_1.default)('music-metadata:parser:DSF');
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/**
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* DSF (dsd stream file) File Parser
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* Ref: https://dsd-guide.com/sites/default/files/white-papers/DSFFileFormatSpec_E.pdf
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*/
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class DsfParser extends AbstractID3Parser_1.AbstractID3Parser {
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async postId3v2Parse() {
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const p0 = this.tokenizer.position; // mark start position, normally 0
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const chunkHeader = await this.tokenizer.readToken(DsfChunk_1.ChunkHeader);
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if (chunkHeader.id !== 'DSD ')
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throw new Error('Invalid chunk signature');
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this.metadata.setFormat('container', 'DSF');
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this.metadata.setFormat('lossless', true);
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const dsdChunk = await this.tokenizer.readToken(DsfChunk_1.DsdChunk);
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if (dsdChunk.metadataPointer === BigInt(0)) {
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debug(`No ID3v2 tag present`);
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}
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else {
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debug(`expect ID3v2 at offset=${dsdChunk.metadataPointer}`);
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await this.parseChunks(dsdChunk.fileSize - chunkHeader.size);
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// Jump to ID3 header
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await this.tokenizer.ignore(Number(dsdChunk.metadataPointer) - this.tokenizer.position - p0);
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return new ID3v2Parser_1.ID3v2Parser().parse(this.metadata, this.tokenizer, this.options);
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}
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}
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async parseChunks(bytesRemaining) {
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while (bytesRemaining >= DsfChunk_1.ChunkHeader.len) {
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const chunkHeader = await this.tokenizer.readToken(DsfChunk_1.ChunkHeader);
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debug(`Parsing chunk name=${chunkHeader.id} size=${chunkHeader.size}`);
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switch (chunkHeader.id) {
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case 'fmt ':
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const formatChunk = await this.tokenizer.readToken(DsfChunk_1.FormatChunk);
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this.metadata.setFormat('numberOfChannels', formatChunk.channelNum);
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this.metadata.setFormat('sampleRate', formatChunk.samplingFrequency);
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this.metadata.setFormat('bitsPerSample', formatChunk.bitsPerSample);
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this.metadata.setFormat('numberOfSamples', formatChunk.sampleCount);
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this.metadata.setFormat('duration', Number(formatChunk.sampleCount) / formatChunk.samplingFrequency);
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const bitrate = formatChunk.bitsPerSample * formatChunk.samplingFrequency * formatChunk.channelNum;
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this.metadata.setFormat('bitrate', bitrate);
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return; // We got what we want, stop further processing of chunks
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default:
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this.tokenizer.ignore(Number(chunkHeader.size) - DsfChunk_1.ChunkHeader.len);
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break;
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}
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bytesRemaining -= chunkHeader.size;
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}
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}
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}
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exports.DsfParser = DsfParser;
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