music-metadata/lib/dsf/DsfChunk.js

Music metadata parser for Node.js, supporting virtual any audio and tag format.

import * as Token from 'token-types';
import { FourCcToken } from '../common/FourCC.js';
/**
 * Common chunk DSD header: the 'chunk name (Four-CC)' & chunk size
 */
export const ChunkHeader = {
    len: 12,
    get: (buf, off) => {
        return { id: FourCcToken.get(buf, off), size: Token.UINT64_LE.get(buf, off + 4) };
    }
};
/**
 * Common chunk DSD header: the 'chunk name (Four-CC)' & chunk size
 */
export const DsdChunk = {
    len: 16,
    get: (buf, off) => {
        return {
            fileSize: Token.INT64_LE.get(buf, off),
            metadataPointer: Token.INT64_LE.get(buf, off + 8)
        };
    }
};
export const ChannelType = {
    mono: 1,
    stereo: 2,
    channels: 3,
    quad: 4,
    '4 channels': 5,
    '5 channels': 6,
    '5.1 channels': 7
};
/**
 * Common chunk DSD header: the 'chunk name (Four-CC)' & chunk size
 */
export const FormatChunk = {
    len: 40,
    get: (buf, off) => {
        return {
            formatVersion: Token.INT32_LE.get(buf, off),
            formatID: Token.INT32_LE.get(buf, off + 4),
            channelType: Token.INT32_LE.get(buf, off + 8),
            channelNum: Token.INT32_LE.get(buf, off + 12),
            samplingFrequency: Token.INT32_LE.get(buf, off + 16),
            bitsPerSample: Token.INT32_LE.get(buf, off + 20),
            sampleCount: Token.INT64_LE.get(buf, off + 24),
            blockSizePerChannel: Token.INT32_LE.get(buf, off + 32)
        };
    }
};