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Viewing file:     VorbisHeader.js (4.9 KB)      -rw-r--r--

/* Copyright 2020-2023 Ethan Halsall
    
    This file is part of codec-parser.
    
    codec-parser is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    codec-parser is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>
*/

/*

1  1) [packet_type] : 8 bit value
2  2) 0x76, 0x6f, 0x72, 0x62, 0x69, 0x73: the characters ’v’,’o’,’r’,’b’,’i’,’s’ as six octets

Letter bits Description
A      8    Packet type
B      48   Magic signature (vorbis)
C      32   Version number
D      8    Channels
E      32   Sample rate
F      32   Bitrate Maximum (signed)
G      32   Bitrate Nominal (signed)
H      32   Bitrate Minimum (signed)
I      4    blocksize 1
J      4    blocksize 0
K      1    Framing flag
*/

import {
  vorbisOpusChannelMapping,
  bitDepth,
  channelMode,
  sampleRate,
  channels,
  length,
  bitrateMaximum,
  bitrateMinimum,
  bitrateNominal,
  blocksize0,
  blocksize1,
  data,
  vorbisComments,
  vorbisSetup,
  version,
  buffer,
  subarray,
  getHeader,
  setHeader,
  getHeaderFromUint8Array,
  uint8Array,
  dataView,
} from "../../constants.js";
import { bytesToString } from "../../utilities.js";

import CodecHeader from "../CodecHeader.js";

const blockSizes = {
  // 0b0110: 64,
  // 0b0111: 128,
  // 0b1000: 256,
  // 0b1001: 512,
  // 0b1010: 1024,
  // 0b1011: 2048,
  // 0b1100: 4096,
  // 0b1101: 8192
};
for (let i = 0; i < 8; i++) blockSizes[i + 6] = 2 ** (6 + i);

export default class VorbisHeader extends CodecHeader {
  static [getHeaderFromUint8Array](
    dataValue,
    headerCache,
    vorbisCommentsData,
    vorbisSetupData,
  ) {
    // Must be at least 30 bytes.
    if (dataValue[length] < 30)
      throw new Error("Out of data while inside an Ogg Page");

    // Check header cache
    const key = bytesToString(dataValue[subarray](0, 30));
    const cachedHeader = headerCache[getHeader](key);
    if (cachedHeader) return new VorbisHeader(cachedHeader);

    const header = { [length]: 30 };

    // Bytes (1-7 of 30): /01vorbis - Magic Signature
    if (key.substr(0, 7) !== "\x01vorbis") {
      return null;
    }

    header[data] = uint8Array.from(dataValue[subarray](0, 30));
    const view = new dataView(header[data][buffer]);

    // Byte (8-11 of 30)
    // * `CCCCCCCC|CCCCCCCC|CCCCCCCC|CCCCCCCC`: Version number
    header[version] = view.getUint32(7, true);
    if (header[version] !== 0) return null;

    // Byte (12 of 30)
    // * `DDDDDDDD`: Channel Count
    header[channels] = dataValue[11];
    header[channelMode] =
      vorbisOpusChannelMapping[header[channels] - 1] || "application defined";

    // Byte (13-16 of 30)
    // * `EEEEEEEE|EEEEEEEE|EEEEEEEE|EEEEEEEE`: Sample Rate
    header[sampleRate] = view.getUint32(12, true);

    // Byte (17-20 of 30)
    // * `FFFFFFFF|FFFFFFFF|FFFFFFFF|FFFFFFFF`: Bitrate Maximum
    header[bitrateMaximum] = view.getInt32(16, true);

    // Byte (21-24 of 30)
    // * `GGGGGGGG|GGGGGGGG|GGGGGGGG|GGGGGGGG`: Bitrate Nominal
    header[bitrateNominal] = view.getInt32(20, true);

    // Byte (25-28 of 30)
    // * `HHHHHHHH|HHHHHHHH|HHHHHHHH|HHHHHHHH`: Bitrate Minimum
    header[bitrateMinimum] = view.getInt32(24, true);

    // Byte (29 of 30)
    // * `IIII....` Blocksize 1
    // * `....JJJJ` Blocksize 0
    header[blocksize1] = blockSizes[(dataValue[28] & 0b11110000) >> 4];
    header[blocksize0] = blockSizes[dataValue[28] & 0b00001111];
    if (header[blocksize0] > header[blocksize1]) return null;

    // Byte (29 of 30)
    // * `00000001` Framing bit
    if (dataValue[29] !== 0x01) return null;

    header[bitDepth] = 32;
    header[vorbisSetup] = vorbisSetupData;
    header[vorbisComments] = vorbisCommentsData;

    {
      // set header cache
      const {
        length,
        data,
        version,
        vorbisSetup,
        vorbisComments,
        ...codecUpdateFields
      } = header;
      headerCache[setHeader](key, header, codecUpdateFields);
    }

    return new VorbisHeader(header);
  }

  /**
   * @private
   * Call VorbisHeader.getHeader(Array<Uint8>) to get instance
   */
  constructor(header) {
    super(header);

    this[bitrateMaximum] = header[bitrateMaximum];
    this[bitrateMinimum] = header[bitrateMinimum];
    this[bitrateNominal] = header[bitrateNominal];
    this[blocksize0] = header[blocksize0];
    this[blocksize1] = header[blocksize1];
    this[data] = header[data];
    this[vorbisComments] = header[vorbisComments];
    this[vorbisSetup] = header[vorbisSetup];
  }
}