29 lines
876 B
JavaScript
29 lines
876 B
JavaScript
|
"use strict";
|
||
|
|
Object.defineProperty(exports, "__esModule", { value: true });
|
||
|
|
exports.IdHeader = void 0;
|
||
|
|
const Token = require("token-types");
|
||
|
|
/**
|
||
|
|
* Opus ID Header parser
|
||
|
|
* Ref: https://wiki.xiph.org/OggOpus#ID_Header
|
||
|
|
*/
|
||
|
|
class IdHeader {
|
||
|
|
constructor(len) {
|
||
|
|
this.len = len;
|
||
|
|
if (len < 19) {
|
||
|
|
throw new Error("ID-header-page 0 should be at least 19 bytes long");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
get(buf, off) {
|
||
|
|
return {
|
||
|
|
magicSignature: new Token.StringType(8, 'ascii').get(buf, off + 0),
|
||
|
|
version: buf.readUInt8(off + 8),
|
||
|
|
channelCount: buf.readUInt8(off + 9),
|
||
|
|
preSkip: buf.readInt16LE(off + 10),
|
||
|
|
inputSampleRate: buf.readInt32LE(off + 12),
|
||
|
|
outputGain: buf.readInt16LE(off + 16),
|
||
|
|
channelMapping: buf.readUInt8(off + 18)
|
||
|
|
};
|
||
|
|
}
|
||
|
|
}
|
||
|
|
exports.IdHeader = IdHeader;
|