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* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2025, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF USE, DATA, OR
* PROFITS, OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
// derived from ISO/IEC 23091-3
const _mapping_CICP = {
'0': undefined,
'1': 1,
'2': 2,
'3': 3,
'4': 4,
'5': 5,
'6': 5,
'7': 7,
'8': 2,
'9': 3,
'10': 4,
'11': 6,
'12': 7,
'13': 22,
'14': 7,
'15': 10,
'16': 9,
'17': 11,
'18': 13,
'19': 11,
'20': 13
};
function _countBits(n) {
return n == 0 ? 0 : n.toString(2).match(/1/g).length;
}
function _getNChanFromBitMask(value, masks) {
let nChan = undefined;
let intVal = parseInt('0x' + value, 16);
let singleChannels = intVal & masks[0];
let ChannelPairs = intVal & masks[1];
nChan = _countBits(singleChannels) + 2 * _countBits(ChannelPairs);
return nChan;
}
function _getNChanDolby2011(value) {
if ( value.length !== 4 ) {
return undefined;
}
// see ETSI TS 103190-1, table F.1:
// 0b1111100110001000: single channel flags
// 0b0000011001110000: channel pair flags
return _getNChanFromBitMask(value, [0b1111100110001000, 0b0000011001110000]);
}
function _getNChanDolby2015(value) {
Iif ( value.length !== 6 ) {
return undefined;
}
if ( value === '800000' ) {
// object audio
return 24;
}
// see ETSI TS 103190-2, table A.27
// 0b001100111000000010: single channel flags
// 0b110010000110111101: channel pair flags
// 0b000001000001000000: LFE - excluded
return _getNChanFromBitMask(value, [0b001100111000000010, 0b110010000110111101]);
}
function _getNChanDTSUHD(value) {
Iif ( value.length > 8 ) {
return undefined;
}
// see ETSI TS 103491, table B-5
// LFE to exclude: 0x00010000 + 0x00000020
return _getNChanFromBitMask(value, [0xFFFEFFDF, 0x00000000]);
}
function getNChanFromAudioChannelConfig(audioChannelConfiguration) {
let nChan = undefined;
if ( !audioChannelConfiguration || !audioChannelConfiguration.schemeIdUri || !audioChannelConfiguration.value ) {
return undefined;
}
const scheme = audioChannelConfiguration['schemeIdUri'];
const value = audioChannelConfiguration['value'];
if (scheme === 'urn:mpeg:dash:23003:3:audio_channel_configuration:2011' || scheme === 'urn:mpeg:mpegB:cicp:ChannelConfiguration') {
// see ISO/IEC 23091-3
nChan = _mapping_CICP[value];
} else if (scheme === 'tag:dolby.com,2014:dash:audio_channel_configuration:2011') {
nChan = _getNChanDolby2011(value);
} else if (scheme === 'tag:dolby.com,2015:dash:audio_channel_configuration:2015') {
nChan = _getNChanDolby2015(value);
} else if (scheme === 'tag:dts.com,2014:dash:audio_channel_configuration:2012') {
nChan = parseInt(value); // per ETSI TS 102 114,table G.2, this includes LFE
} else if (scheme === 'tag:dts.com,2018:uhd:audio_channel_configuration') {
nChan = _getNChanDTSUHD(value);
}
return nChan;
}
export default getNChanFromAudioChannelConfig;
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