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| Viewing file: Select action/file-type: /* 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/>
*/
/*
https://tools.ietf.org/html/rfc7845.html
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 'O' | 'p' | 'u' | 's' |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 'H' | 'e' | 'a' | 'd' |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version = 1 | Channel Count | Pre-skip |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Sample Rate (Hz) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Output Gain (Q7.8 in dB) | Mapping Family| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ :
| |
: Optional Channel Mapping Table... :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Letter Length (bits) Description
A 64 Magic Signature - OpusHead
B 8 Version number - 00000001
C 8 Output channel count (unsigned)
D 16 Pre-skip (unsigned, little endian)
E 32 Sample rate (unsigned, little endian)
F 16 Output Gain (signed, little endian)
G 8 Channel Mapping family (unsigned)
// if(channel mapping !== 0)
H 8 Stream count (unsigned)
I 8 Coupled Stream Count (unsigned)
J 8*C Channel Mapping
*/
import {
rate48000,
vorbisOpusChannelMapping,
bitDepth,
channelMode,
sampleRate,
channels,
length,
bandwidth,
channelMappingFamily,
channelMappingTable,
coupledStreamCount,
frameCount,
frameSize,
hasOpusPadding,
inputSampleRate,
isVbr,
mode,
outputGain,
preSkip,
streamCount,
data,
buffer,
subarray,
getHeader,
setHeader,
getHeaderFromUint8Array,
uint8Array,
dataView,
} from "../../constants.js";
import { bytesToString } from "../../utilities.js";
import CodecHeader from "../CodecHeader.js";
/* prettier-ignore */
const channelMappingFamilies = {
0b00000000: vorbisOpusChannelMapping.slice(0,2),
/*
0: "monophonic (mono)"
1: "stereo (left, right)"
*/
0b00000001: vorbisOpusChannelMapping
/*
0: "monophonic (mono)"
1: "stereo (left, right)"
2: "linear surround (left, center, right)"
3: "quadraphonic (front left, front right, rear left, rear right)"
4: "5.0 surround (front left, front center, front right, rear left, rear right)"
5: "5.1 surround (front left, front center, front right, rear left, rear right, LFE)"
6: "6.1 surround (front left, front center, front right, side left, side right, rear center, LFE)"
7: "7.1 surround (front left, front center, front right, side left, side right, rear left, rear right, LFE)"
*/
// additional channel mappings are user defined
};
const silkOnly = "SILK-only";
const celtOnly = "CELT-only";
const hybrid = "Hybrid";
const narrowBand = "narrowband";
const mediumBand = "medium-band";
const wideBand = "wideband";
const superWideBand = "super-wideband";
const fullBand = "fullband";
// 0 1 2 3 4 5 6 7
// +-+-+-+-+-+-+-+-+
// | config |s| c |
// +-+-+-+-+-+-+-+-+
// prettier-ignore
const configTable = {
0b00000000: { [mode]: silkOnly, [bandwidth]: narrowBand, [frameSize]: 10 },
0b00001000: { [mode]: silkOnly, [bandwidth]: narrowBand, [frameSize]: 20 },
0b00010000: { [mode]: silkOnly, [bandwidth]: narrowBand, [frameSize]: 40 },
0b00011000: { [mode]: silkOnly, [bandwidth]: narrowBand, [frameSize]: 60 },
0b00100000: { [mode]: silkOnly, [bandwidth]: mediumBand, [frameSize]: 10 },
0b00101000: { [mode]: silkOnly, [bandwidth]: mediumBand, [frameSize]: 20 },
0b00110000: { [mode]: silkOnly, [bandwidth]: mediumBand, [frameSize]: 40 },
0b00111000: { [mode]: silkOnly, [bandwidth]: mediumBand, [frameSize]: 60 },
0b01000000: { [mode]: silkOnly, [bandwidth]: wideBand, [frameSize]: 10 },
0b01001000: { [mode]: silkOnly, [bandwidth]: wideBand, [frameSize]: 20 },
0b01010000: { [mode]: silkOnly, [bandwidth]: wideBand, [frameSize]: 40 },
0b01011000: { [mode]: silkOnly, [bandwidth]: wideBand, [frameSize]: 60 },
0b01100000: { [mode]: hybrid, [bandwidth]: superWideBand, [frameSize]: 10 },
0b01101000: { [mode]: hybrid, [bandwidth]: superWideBand, [frameSize]: 20 },
0b01110000: { [mode]: hybrid, [bandwidth]: fullBand, [frameSize]: 10 },
0b01111000: { [mode]: hybrid, [bandwidth]: fullBand, [frameSize]: 20 },
0b10000000: { [mode]: celtOnly, [bandwidth]: narrowBand, [frameSize]: 2.5 },
0b10001000: { [mode]: celtOnly, [bandwidth]: narrowBand, [frameSize]: 5 },
0b10010000: { [mode]: celtOnly, [bandwidth]: narrowBand, [frameSize]: 10 },
0b10011000: { [mode]: celtOnly, [bandwidth]: narrowBand, [frameSize]: 20 },
0b10100000: { [mode]: celtOnly, [bandwidth]: wideBand, [frameSize]: 2.5 },
0b10101000: { [mode]: celtOnly, [bandwidth]: wideBand, [frameSize]: 5 },
0b10110000: { [mode]: celtOnly, [bandwidth]: wideBand, [frameSize]: 10 },
0b10111000: { [mode]: celtOnly, [bandwidth]: wideBand, [frameSize]: 20 },
0b11000000: { [mode]: celtOnly, [bandwidth]: superWideBand, [frameSize]: 2.5 },
0b11001000: { [mode]: celtOnly, [bandwidth]: superWideBand, [frameSize]: 5 },
0b11010000: { [mode]: celtOnly, [bandwidth]: superWideBand, [frameSize]: 10 },
0b11011000: { [mode]: celtOnly, [bandwidth]: superWideBand, [frameSize]: 20 },
0b11100000: { [mode]: celtOnly, [bandwidth]: fullBand, [frameSize]: 2.5 },
0b11101000: { [mode]: celtOnly, [bandwidth]: fullBand, [frameSize]: 5 },
0b11110000: { [mode]: celtOnly, [bandwidth]: fullBand, [frameSize]: 10 },
0b11111000: { [mode]: celtOnly, [bandwidth]: fullBand, [frameSize]: 20 },
};
export default class OpusHeader extends CodecHeader {
static [getHeaderFromUint8Array](dataValue, packetData, headerCache) {
const header = {};
// get length of header
// Byte (10 of 19)
// * `CCCCCCCC`: Channel Count
header[channels] = dataValue[9];
// Byte (19 of 19)
// * `GGGGGGGG`: Channel Mapping Family
header[channelMappingFamily] = dataValue[18];
header[length] =
header[channelMappingFamily] !== 0 ? 21 + header[channels] : 19;
if (dataValue[length] < header[length])
throw new Error("Out of data while inside an Ogg Page");
// Page Segment Bytes (1-2)
// * `AAAAA...`: Packet config
// * `.....B..`:
// * `......CC`: Packet code
const packetMode = packetData[0] & 0b00000011;
const packetLength = packetMode === 3 ? 2 : 1;
// Check header cache
const key =
bytesToString(dataValue[subarray](0, header[length])) +
bytesToString(packetData[subarray](0, packetLength));
const cachedHeader = headerCache[getHeader](key);
if (cachedHeader) return new OpusHeader(cachedHeader);
// Bytes (1-8 of 19): OpusHead - Magic Signature
if (key.substr(0, 8) !== "OpusHead") {
return null;
}
// Byte (9 of 19)
// * `00000001`: Version number
if (dataValue[8] !== 1) return null;
header[data] = uint8Array.from(dataValue[subarray](0, header[length]));
const view = new dataView(header[data][buffer]);
header[bitDepth] = 16;
// Byte (10 of 19)
// * `CCCCCCCC`: Channel Count
// set earlier to determine length
// Byte (11-12 of 19)
// * `DDDDDDDD|DDDDDDDD`: Pre skip
header[preSkip] = view.getUint16(10, true);
// Byte (13-16 of 19)
// * `EEEEEEEE|EEEEEEEE|EEEEEEEE|EEEEEEEE`: Sample Rate
header[inputSampleRate] = view.getUint32(12, true);
// Opus is always decoded at 48kHz
header[sampleRate] = rate48000;
// Byte (17-18 of 19)
// * `FFFFFFFF|FFFFFFFF`: Output Gain
header[outputGain] = view.getInt16(16, true);
// Byte (19 of 19)
// * `GGGGGGGG`: Channel Mapping Family
// set earlier to determine length
if (header[channelMappingFamily] in channelMappingFamilies) {
header[channelMode] =
channelMappingFamilies[header[channelMappingFamily]][
header[channels] - 1
];
if (!header[channelMode]) return null;
}
if (header[channelMappingFamily] !== 0) {
// * `HHHHHHHH`: Stream count
header[streamCount] = dataValue[19];
// * `IIIIIIII`: Coupled Stream count
header[coupledStreamCount] = dataValue[20];
// * `JJJJJJJJ|...` Channel Mapping table
header[channelMappingTable] = [
...dataValue[subarray](21, header[channels] + 21),
];
}
const packetConfig = configTable[0b11111000 & packetData[0]];
header[mode] = packetConfig[mode];
header[bandwidth] = packetConfig[bandwidth];
header[frameSize] = packetConfig[frameSize];
// https://tools.ietf.org/html/rfc6716#appendix-B
switch (packetMode) {
case 0:
// 0: 1 frame in the packet
header[frameCount] = 1;
break;
case 1:
// 1: 2 frames in the packet, each with equal compressed size
case 2:
// 2: 2 frames in the packet, with different compressed sizes
header[frameCount] = 2;
break;
case 3:
// 3: an arbitrary number of frames in the packet
header[isVbr] = !!(0b10000000 & packetData[1]);
header[hasOpusPadding] = !!(0b01000000 & packetData[1]);
header[frameCount] = 0b00111111 & packetData[1];
break;
default:
return null;
}
// set header cache
{
const {
length,
data: headerData,
channelMappingFamily,
...codecUpdateFields
} = header;
headerCache[setHeader](key, header, codecUpdateFields);
}
return new OpusHeader(header);
}
/**
* @private
* Call OpusHeader.getHeader(Array<Uint8>) to get instance
*/
constructor(header) {
super(header);
this[data] = header[data];
this[bandwidth] = header[bandwidth];
this[channelMappingFamily] = header[channelMappingFamily];
this[channelMappingTable] = header[channelMappingTable];
this[coupledStreamCount] = header[coupledStreamCount];
this[frameCount] = header[frameCount];
this[frameSize] = header[frameSize];
this[hasOpusPadding] = header[hasOpusPadding];
this[inputSampleRate] = header[inputSampleRate];
this[isVbr] = header[isVbr];
this[mode] = header[mode];
this[outputGain] = header[outputGain];
this[preSkip] = header[preSkip];
this[streamCount] = header[streamCount];
}
}
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