Borewit
63 lines
2.8 KiB
TypeScript
63 lines
2.8 KiB
TypeScript
import initDebug from 'debug';
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import { AbstractID3Parser } from '../id3v2/AbstractID3Parser.js';
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import { ChunkHeader, DsdChunk, FormatChunk, type IChunkHeader, type IDsdChunk, type IFormatChunk } from './DsfChunk.js';
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import { ID3v2Parser } from "../id3v2/ID3v2Parser.js";
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import { makeUnexpectedFileContentError } from '../ParseError.js';
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const debug = initDebug('music-metadata:parser:DSF');
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export class DsdContentParseError extends makeUnexpectedFileContentError('DSD'){
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}
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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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export class DsfParser extends AbstractID3Parser {
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public async postId3v2Parse(): Promise<void> {
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const p0 = this.tokenizer.position; // mark start position, normally 0
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const chunkHeader = await this.tokenizer.readToken<IChunkHeader>(ChunkHeader);
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if (chunkHeader.id !== 'DSD ') throw new DsdContentParseError('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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this.metadata.setAudioOnly();
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const dsdChunk = await this.tokenizer.readToken<IDsdChunk>(DsdChunk);
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if (dsdChunk.metadataPointer === BigInt(0)) {
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debug("No ID3v2 tag present");
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} else {
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debug(`expect ID3v2 at offset=${dsdChunk.metadataPointer}`);
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await this.parseChunks(dsdChunk.fileSize - chunkHeader.size);
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// Jump to ID3 header
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await this.tokenizer.ignore(Number(dsdChunk.metadataPointer) - this.tokenizer.position - p0);
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return new ID3v2Parser().parse(this.metadata, this.tokenizer, this.options);
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}
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}
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private async parseChunks(bytesRemaining: bigint) {
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while (bytesRemaining >= ChunkHeader.len) {
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const chunkHeader = await this.tokenizer.readToken<IChunkHeader>(ChunkHeader);
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debug(`Parsing chunk name=${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<IFormatChunk>(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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}
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default:
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this.tokenizer.ignore(Number(chunkHeader.size) - 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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