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#201 Split WavPack token & parser code.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| import * as Token from 'token-types'; | ||
| import { FourCcToken } from '../common/FourCC'; | ||
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| /** | ||
| * WavPack Block Header | ||
| * | ||
| * 32-byte little-endian header at the front of every WavPack block | ||
| * | ||
| * Ref: | ||
| * http://www.wavpack.com/WavPack5FileFormat.pdf (page 2/6: 2.0 "Block Header") | ||
| */ | ||
| export interface IBlockHeader { | ||
| // should be equal to 'wvpk' for WavPack | ||
| BlockID: string, | ||
| // size of entire block (minus 8) | ||
| blockSize: number, | ||
| // 0x402 to 0x410 are valid for decode | ||
| version: number, | ||
| // 40-bit block_index | ||
| blockIndex: number, | ||
| // 40-bit total samples for entire file (if block_index == 0 and a value of -1 indicates an unknown length) | ||
| totalSamples: number, | ||
| // number of samples in this block, 0 = non-audio block | ||
| blockSamples: number, | ||
| // various flags for id and decoding | ||
| flags: { | ||
| // 00 = 1 byte / sample (1-8 bits / sample) | ||
| // 01 = 2 bytes / sample (9-16 bits / sample) | ||
| // 10 = 3 bytes / sample (15-24 bits / sample) | ||
| // 11 = 4 bytes / sample (25-32 bits / sample) | ||
| bitsPerSample: number, | ||
| isMono: boolean, | ||
| isHybrid: boolean | ||
| isJointStereo: boolean, | ||
| crossChannel: boolean, | ||
| hybridNoiseShaping: boolean, | ||
| floatingPoint: boolean, | ||
| samplingRate: number, | ||
| isDSD: boolean | ||
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| // false = PCM audio; true = DSD audio (ver 5.0+) | ||
| } | ||
| // crc for actual decoded data | ||
| crc: Buffer | ||
| } | ||
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| export interface IMetadataId { | ||
| /** | ||
| * metadata function id | ||
| */ | ||
| functionId: number, | ||
| /** | ||
| * If true, audio-decoder does not need to understand the metadata field | ||
| */ | ||
| isOptional: boolean | ||
| /** | ||
| * actual data byte length is 1 less | ||
| */ | ||
| actualDataByteLength: boolean | ||
| /** | ||
| * large block (> 255 words) | ||
| */ | ||
| largeBlock: boolean | ||
| } | ||
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| const SampleRates = [6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000, 32000, 44100, | ||
| 48000, 64000, 88200, 96000, 192000, -1]; | ||
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| export class WavPack { | ||
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| /** | ||
| * WavPack Block Header | ||
| * | ||
| * 32-byte little-endian header at the front of every WavPack block | ||
| * | ||
| * Ref: http://www.wavpack.com/WavPack5FileFormat.pdf (page 2/6: 2.0 "Block Header") | ||
| */ | ||
| public static BlockHeaderToken: Token.IGetToken<IBlockHeader> = { | ||
| len: 32, | ||
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| get: (buf, off) => { | ||
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| const flags = Token.UINT32_LE.get(buf, off + 24); | ||
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| return { | ||
| // should equal 'wvpk' | ||
| BlockID: FourCcToken.get(buf, off), | ||
| // 0x402 to 0x410 are valid for decode | ||
| blockSize: Token.UINT32_LE.get(buf, off + 4), | ||
| // 0x402 (1026) to 0x410 are valid for decode | ||
| version: Token.UINT16_LE.get(buf, off + 8), | ||
| // 40-bit total samples for entire file (if block_index == 0 and a value of -1 indicates an unknown length) | ||
| totalSamples: (Token.UINT8.get(buf, off + 11) << 32) + Token.UINT32_LE.get(buf, off + 12), | ||
| // 40-bit block_index | ||
| blockIndex: (Token.UINT8.get(buf, off + 10) << 32) + Token.UINT32_LE.get(buf, off + 16), | ||
| // 40-bit total samples for entire file (if block_index == 0 and a value of -1 indicates an unknown length) | ||
| blockSamples: Token.UINT32_LE.get(buf, off + 20), | ||
| // various flags for id and decoding | ||
| flags: { | ||
| bitsPerSample: (1 + WavPack.getBitAllignedNumber(flags, 0, 2)) * 8, | ||
| isMono: WavPack.isBitSet(flags, 2), | ||
| isHybrid: WavPack.isBitSet(flags, 3), | ||
| isJointStereo: WavPack.isBitSet(flags, 4), | ||
| crossChannel: WavPack.isBitSet(flags, 5), | ||
| hybridNoiseShaping: WavPack.isBitSet(flags, 6), | ||
| floatingPoint: WavPack.isBitSet(flags, 7), | ||
| samplingRate: SampleRates[WavPack.getBitAllignedNumber(flags, 23, 4)], | ||
| isDSD: WavPack.isBitSet(flags, 31) | ||
| }, | ||
| // crc for actual decoded data | ||
| crc: new Token.BufferType(4).get(buf, off + 28) | ||
| }; | ||
| } | ||
| }; | ||
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| /** | ||
| * 3.0 Metadata Sub-Blocks | ||
| * Ref: http://www.wavpack.com/WavPack5FileFormat.pdf (page 4/6: 3.0 "Metadata Sub-Block") | ||
| */ | ||
| public static MetadataIdToken: Token.IGetToken<IMetadataId> = { | ||
| len: 1, | ||
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| get: (buf, off) => { | ||
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| return { | ||
| functionId: WavPack.getBitAllignedNumber(buf[off], 0, 6), | ||
| isOptional: WavPack.isBitSet(buf[off], 5), | ||
| actualDataByteLength: WavPack.isBitSet(buf[off], 6), | ||
| largeBlock: WavPack.isBitSet(buf[off], 7) | ||
| }; | ||
| } | ||
| }; | ||
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| private static isBitSet(flags: number, bitOffset: number): boolean { | ||
| return WavPack.getBitAllignedNumber(flags, bitOffset, 1) === 1; | ||
| } | ||
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| private static getBitAllignedNumber(flags: number, bitOffset: number, len: number): number { | ||
| return (flags >>> bitOffset) & (0xffffffff >>> (32 - len)); | ||
| } | ||
| } |