110 lines
5.8 KiB
JavaScript
110 lines
5.8 KiB
JavaScript
import * as Token from 'token-types';
|
|
import { tryParseApeHeader } from '../apev2/APEv2Parser.js';
|
|
import { FourCcToken } from '../common/FourCC.js';
|
|
import { BasicParser } from '../common/BasicParser.js';
|
|
import { BlockHeaderToken, MetadataIdToken } from './WavPackToken.js';
|
|
import initDebug from 'debug';
|
|
import { uint8ArrayToHex } from 'uint8array-extras';
|
|
import { makeUnexpectedFileContentError } from '../ParseError.js';
|
|
const debug = initDebug('music-metadata:parser:WavPack');
|
|
export class WavPackContentError extends makeUnexpectedFileContentError('WavPack') {
|
|
}
|
|
/**
|
|
* WavPack Parser
|
|
*/
|
|
export class WavPackParser extends BasicParser {
|
|
constructor() {
|
|
super(...arguments);
|
|
this.audioDataSize = 0;
|
|
}
|
|
async parse() {
|
|
this.metadata.setAudioOnly();
|
|
this.audioDataSize = 0;
|
|
// First parse all WavPack blocks
|
|
await this.parseWavPackBlocks();
|
|
// try to parse APEv2 header
|
|
return tryParseApeHeader(this.metadata, this.tokenizer, this.options);
|
|
}
|
|
async parseWavPackBlocks() {
|
|
do {
|
|
const blockId = await this.tokenizer.peekToken(FourCcToken);
|
|
if (blockId !== 'wvpk')
|
|
break;
|
|
const header = await this.tokenizer.readToken(BlockHeaderToken);
|
|
if (header.BlockID !== 'wvpk')
|
|
throw new WavPackContentError('Invalid WavPack Block-ID');
|
|
debug(`WavPack header blockIndex=${header.blockIndex}, len=${BlockHeaderToken.len}`);
|
|
if (header.blockIndex === 0 && !this.metadata.format.container) {
|
|
this.metadata.setFormat('container', 'WavPack');
|
|
this.metadata.setFormat('lossless', !header.flags.isHybrid);
|
|
// tagTypes: this.type,
|
|
this.metadata.setFormat('bitsPerSample', header.flags.bitsPerSample);
|
|
if (!header.flags.isDSD) {
|
|
// In case isDSD, these values will ne set in ID_DSD_BLOCK
|
|
this.metadata.setFormat('sampleRate', header.flags.samplingRate);
|
|
this.metadata.setFormat('duration', header.totalSamples / header.flags.samplingRate);
|
|
}
|
|
this.metadata.setFormat('numberOfChannels', header.flags.isMono ? 1 : 2);
|
|
this.metadata.setFormat('numberOfSamples', header.totalSamples);
|
|
this.metadata.setFormat('codec', header.flags.isDSD ? 'DSD' : 'PCM');
|
|
}
|
|
const ignoreBytes = header.blockSize - (BlockHeaderToken.len - 8);
|
|
await (header.blockIndex === 0 ? this.parseMetadataSubBlock(header, ignoreBytes) : this.tokenizer.ignore(ignoreBytes));
|
|
if (header.blockSamples > 0) {
|
|
this.audioDataSize += header.blockSize; // Count audio data for bit-rate calculation
|
|
}
|
|
} while (!this.tokenizer.fileInfo.size || this.tokenizer.fileInfo.size - this.tokenizer.position >= BlockHeaderToken.len);
|
|
if (this.metadata.format.duration) {
|
|
this.metadata.setFormat('bitrate', this.audioDataSize * 8 / this.metadata.format.duration);
|
|
}
|
|
}
|
|
/**
|
|
* Ref: http://www.wavpack.com/WavPack5FileFormat.pdf, 3.0 Metadata Sub-blocks
|
|
* @param header Header
|
|
* @param remainingLength Remaining length
|
|
*/
|
|
async parseMetadataSubBlock(header, remainingLength) {
|
|
let remaining = remainingLength;
|
|
while (remaining > MetadataIdToken.len) {
|
|
const id = await this.tokenizer.readToken(MetadataIdToken);
|
|
const dataSizeInWords = await this.tokenizer.readNumber(id.largeBlock ? Token.UINT24_LE : Token.UINT8);
|
|
const data = new Uint8Array(dataSizeInWords * 2 - (id.isOddSize ? 1 : 0));
|
|
await this.tokenizer.readBuffer(data);
|
|
debug(`Metadata Sub-Blocks functionId=0x${id.functionId.toString(16)}, id.largeBlock=${id.largeBlock},data-size=${data.length}`);
|
|
switch (id.functionId) {
|
|
case 0x0: // ID_DUMMY: could be used to pad WavPack blocks
|
|
break;
|
|
case 0xe: { // ID_DSD_BLOCK
|
|
debug('ID_DSD_BLOCK');
|
|
// https://github.com/dbry/WavPack/issues/71#issuecomment-483094813
|
|
const mp = 1 << Token.UINT8.get(data, 0);
|
|
const samplingRate = header.flags.samplingRate * mp * 8; // ToDo: second factor should be read from DSD-metadata block https://github.com/dbry/WavPack/issues/71#issuecomment-483094813
|
|
if (!header.flags.isDSD)
|
|
throw new WavPackContentError('Only expect DSD block if DSD-flag is set');
|
|
this.metadata.setFormat('sampleRate', samplingRate);
|
|
this.metadata.setFormat('duration', header.totalSamples / samplingRate);
|
|
break;
|
|
}
|
|
case 0x24: // ID_ALT_TRAILER: maybe used to embed original ID3 tag header
|
|
debug('ID_ALT_TRAILER: trailer for non-wav files');
|
|
break;
|
|
case 0x26: // ID_MD5_CHECKSUM
|
|
this.metadata.setFormat('audioMD5', data);
|
|
break;
|
|
case 0x2f: // ID_BLOCK_CHECKSUM
|
|
debug(`ID_BLOCK_CHECKSUM: checksum=${uint8ArrayToHex(data)}`);
|
|
break;
|
|
default:
|
|
debug(`Ignore unsupported meta-sub-block-id functionId=0x${id.functionId.toString(16)}`);
|
|
break;
|
|
}
|
|
remaining -= MetadataIdToken.len + (id.largeBlock ? Token.UINT24_LE.len : Token.UINT8.len) + dataSizeInWords * 2;
|
|
debug(`remainingLength=${remaining}`);
|
|
if (id.isOddSize)
|
|
this.tokenizer.ignore(1);
|
|
}
|
|
if (remaining !== 0)
|
|
throw new WavPackContentError('metadata-sub-block should fit it remaining length');
|
|
}
|
|
}
|