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Viewing file:     OggParser.js (5.53 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.OggParser = exports.SegmentTable = void 0;
const Token = require("token-types");
const core_1 = require("strtok3/lib/core");
const debug_1 = require("debug");
const util = require("../common/Util");
const FourCC_1 = require("../common/FourCC");
const BasicParser_1 = require("../common/BasicParser");
const VorbisParser_1 = require("./vorbis/VorbisParser");
const OpusParser_1 = require("./opus/OpusParser");
const SpeexParser_1 = require("./speex/SpeexParser");
const TheoraParser_1 = require("./theora/TheoraParser");
const debug = (0, debug_1.default)('music-metadata:parser:ogg');
class SegmentTable {
    static sum(buf, off, len) {
        let s = 0;
        for (let i = off; i < off + len; ++i) {
            s += buf[i];
        }
        return s;
    }
    constructor(header) {
        this.len = header.page_segments;
    }
    get(buf, off) {
        return {
            totalPageSize: SegmentTable.sum(buf, off, this.len)
        };
    }
}
exports.SegmentTable = SegmentTable;
/**
 * Parser for Ogg logical bitstream framing
 */
class OggParser extends BasicParser_1.BasicParser {
    /**
     * Parse page
     * @returns {Promise<void>}
     */
    async parse() {
        debug('pos=%s, parsePage()', this.tokenizer.position);
        try {
            let header;
            do {
                header = await this.tokenizer.readToken(OggParser.Header);
                if (header.capturePattern !== 'OggS')
                    throw new Error('Invalid Ogg capture pattern');
                this.metadata.setFormat('container', 'Ogg');
                this.header = header;
                this.pageNumber = header.pageSequenceNo;
                debug('page#=%s, Ogg.id=%s', header.pageSequenceNo, header.capturePattern);
                const segmentTable = await this.tokenizer.readToken(new SegmentTable(header));
                debug('totalPageSize=%s', segmentTable.totalPageSize);
                const pageData = await this.tokenizer.readToken(new Token.Uint8ArrayType(segmentTable.totalPageSize));
                debug('firstPage=%s, lastPage=%s, continued=%s', header.headerType.firstPage, header.headerType.lastPage, header.headerType.continued);
                if (header.headerType.firstPage) {
                    const id = new Token.StringType(7, 'ascii').get(Buffer.from(pageData), 0);
                    switch (id) {
                        case '\x01vorbis': // Ogg/Vorbis
                            debug('Set page consumer to Ogg/Vorbis');
                            this.pageConsumer = new VorbisParser_1.VorbisParser(this.metadata, this.options);
                            break;
                        case 'OpusHea': // Ogg/Opus
                            debug('Set page consumer to Ogg/Opus');
                            this.pageConsumer = new OpusParser_1.OpusParser(this.metadata, this.options, this.tokenizer);
                            break;
                        case 'Speex  ': // Ogg/Speex
                            debug('Set page consumer to Ogg/Speex');
                            this.pageConsumer = new SpeexParser_1.SpeexParser(this.metadata, this.options, this.tokenizer);
                            break;
                        case 'fishead':
                        case '\x00theora': // Ogg/Theora
                            debug('Set page consumer to Ogg/Theora');
                            this.pageConsumer = new TheoraParser_1.TheoraParser(this.metadata, this.options, this.tokenizer);
                            break;
                        default:
                            throw new Error('gg audio-codec not recognized (id=' + id + ')');
                    }
                }
                this.pageConsumer.parsePage(header, pageData);
            } while (!header.headerType.lastPage);
        }
        catch (err) {
            if (err instanceof core_1.EndOfStreamError) {
                this.metadata.addWarning('Last OGG-page is not marked with last-page flag');
                debug(`End-of-stream`);
                this.metadata.addWarning('Last OGG-page is not marked with last-page flag');
                if (this.header) {
                    this.pageConsumer.calculateDuration(this.header);
                }
            }
            else if (err.message.startsWith('FourCC')) {
                if (this.pageNumber > 0) {
                    // ignore this error: work-around if last OGG-page is not marked with last-page flag
                    this.metadata.addWarning('Invalid FourCC ID, maybe last OGG-page is not marked with last-page flag');
                    this.pageConsumer.flush();
                }
            }
            else {
                throw err;
            }
        }
    }
}
OggParser.Header = {
    len: 27,
    get: (buf, off) => {
        return {
            capturePattern: FourCC_1.FourCcToken.get(buf, off),
            version: Token.UINT8.get(buf, off + 4),
            headerType: {
                continued: util.getBit(buf, off + 5, 0),
                firstPage: util.getBit(buf, off + 5, 1),
                lastPage: util.getBit(buf, off + 5, 2)
            },
            // packet_flag: buf.readUInt8(off + 5),
            absoluteGranulePosition: Number(Token.UINT64_LE.get(buf, off + 6)),
            streamSerialNumber: Token.UINT32_LE.get(buf, off + 14),
            pageSequenceNo: Token.UINT32_LE.get(buf, off + 18),
            pageChecksum: Token.UINT32_LE.get(buf, off + 22),
            page_segments: Token.UINT8.get(buf, off + 26)
        };
    }
};
exports.OggParser = OggParser;