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 +1,46 @@
+'use strict';
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.MpcSv7Parser = void 0;
+const initDebug = require("debug");
+const BasicParser_1 = require("../../common/BasicParser");
+const SV7 = require("./StreamVersion7");
+const APEv2Parser_1 = require("../../apev2/APEv2Parser");
+const BitReader_1 = require("./BitReader");
+const debug = initDebug('music-metadata:parser:musepack');
+class MpcSv7Parser extends BasicParser_1.BasicParser {
+    constructor() {
+        super(...arguments);
+        this.audioLength = 0;
+    }
+    async parse() {
+        const header = await this.tokenizer.readToken(SV7.Header);
+        if (header.signature !== 'MP+')
+            throw new Error('Unexpected magic number');
+        debug(`stream-version=${header.streamMajorVersion}.${header.streamMinorVersion}`);
+        this.metadata.setFormat('container', 'Musepack, SV7');
+        this.metadata.setFormat('sampleRate', header.sampleFrequency);
+        const numberOfSamples = 1152 * (header.frameCount - 1) + header.lastFrameLength;
+        this.metadata.setFormat('numberOfSamples', numberOfSamples);
+        this.duration = numberOfSamples / header.sampleFrequency;
+        this.metadata.setFormat('duration', this.duration);
+        this.bitreader = new BitReader_1.BitReader(this.tokenizer);
+        this.metadata.setFormat('numberOfChannels', header.midSideStereo || header.intensityStereo ? 2 : 1);
+        const version = await this.bitreader.read(8);
+        this.metadata.setFormat('codec', (version / 100).toFixed(2));
+        await this.skipAudioData(header.frameCount);
+        debug(`End of audio stream, switching to APEv2, offset=${this.tokenizer.position}`);
+        return APEv2Parser_1.APEv2Parser.tryParseApeHeader(this.metadata, this.tokenizer, this.options);
+    }
+    async skipAudioData(frameCount) {
+        while (frameCount-- > 0) {
+            const frameLength = await this.bitreader.read(20);
+            this.audioLength += 20 + frameLength;
+            await this.bitreader.ignore(frameLength);
+        }
+        // last frame
+        const lastFrameLength = await this.bitreader.read(11);
+        this.audioLength += lastFrameLength;
+        this.metadata.setFormat('bitrate', this.audioLength / this.duration);
+    }
+}
+exports.MpcSv7Parser = MpcSv7Parser;