shaka-player
Version:
DASH/EME video player library
92 lines (85 loc) • 2.22 kB
JavaScript
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.transmuxer.Opus');
goog.requireType('shaka.util.TsParser');
/**
* Opus utils
*/
shaka.transmuxer.Opus = class {
/**
* @param {!shaka.util.TsParser.OpusMetadata} metadata
* @return {!Uint8Array}
*/
static getAudioConfig(metadata) {
let mapping = [];
switch (metadata.channelConfigCode) {
case 0x01:
case 0x02:
mapping = [0x0];
break;
case 0x00: // dualmono
mapping = [0xFF, 1, 1, 0, 1];
break;
case 0x80: // dualmono
mapping = [0xFF, 2, 0, 0, 1];
break;
case 0x03:
mapping = [0x01, 2, 1, 0, 2, 1];
break;
case 0x04:
mapping = [0x01, 2, 2, 0, 1, 2, 3];
break;
case 0x05:
mapping = [0x01, 3, 2, 0, 4, 1, 2, 3];
break;
case 0x06:
mapping = [0x01, 4, 2, 0, 4, 1, 2, 3, 5];
break;
case 0x07:
mapping = [0x01, 4, 2, 0, 4, 1, 2, 3, 5, 6];
break;
case 0x08:
mapping = [0x01, 5, 3, 0, 6, 1, 2, 3, 4, 5, 7];
break;
case 0x82:
mapping = [0x01, 1, 2, 0, 1];
break;
case 0x83:
mapping = [0x01, 1, 3, 0, 1, 2];
break;
case 0x84:
mapping = [0x01, 1, 4, 0, 1, 2, 3];
break;
case 0x85:
mapping = [0x01, 1, 5, 0, 1, 2, 3, 4];
break;
case 0x86:
mapping = [0x01, 1, 6, 0, 1, 2, 3, 4, 5];
break;
case 0x87:
mapping = [0x01, 1, 7, 0, 1, 2, 3, 4, 5, 6];
break;
case 0x88:
mapping = [0x01, 1, 8, 0, 1, 2, 3, 4, 5, 6, 7];
break;
}
return new Uint8Array([
0x00, // Version (1)
metadata.channelCount, // OutputChannelCount: 2
0x00, 0x00, // PreSkip: 2
(metadata.sampleRate >>> 24) & 0xFF, // Audio sample rate: 4
(metadata.sampleRate >>> 17) & 0xFF,
(metadata.sampleRate >>> 8) & 0xFF,
(metadata.sampleRate >>> 0) & 0xFF,
0x00, 0x00, // Global Gain : 2
...mapping,
]);
}
};
/**
* @const {number}
*/
shaka.transmuxer.Opus.OPUS_AUDIO_SAMPLE_PER_FRAME = 960;