Initial working version

2022-12-22 20:22:22 +11:00
parent ce9675a1cc
commit ced7fa5092
902 changed files with 150252 additions and 0 deletions
@@ -0,0 +1,56 @@
+'use strict';
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.DsfParser = void 0;
+const AbstractID3Parser_1 = require("../id3v2/AbstractID3Parser");
+const _debug = require("debug");
+const DsfChunk_1 = require("./DsfChunk");
+const ID3v2Parser_1 = require("../id3v2/ID3v2Parser");
+const debug = _debug('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 _parse() {
+        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;