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