rx-player
Version:
Canal+ HTML5 Video Player
68 lines (67 loc) • 2.3 kB
JavaScript
/**
* Copyright 2015 CANAL+ Group
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Extract the webm HDR information out of the codec string.
* The syntax of the codec string is defined in VP Codec ISO Media File Format
* Binding, in the section Codecs Parameter String.
* @param {string} codecString
* @returns {Object | undefined}
*/
export function getWEBMHDRInformation(codecString) {
// cccc.PP.LL.DD.CC[.cp[.tc[.mc[.FF]]]]
const [cccc, _PP, _LL, DD, _CC, cp, tc, mc] = codecString.split(".");
if (cccc !== "vp08" && cccc !== "vp09" && cccc !== "vp10") {
return undefined;
}
let colorDepth;
let eotf;
let colorSpace;
if ((DD !== undefined && DD === "10") || DD === "12") {
colorDepth = parseInt(DD, 10);
}
if (tc !== undefined) {
// 1: ITU-R BT.709
// 2: Unspecified
// 4: Gamma 2.2 curve
// 5: Gamma 2.8 curve
// 6: SMPTE 170M
// 7: SMPTE 240M
// 8: Linear
// 9: Logarithmic (100:1 range)
// 10: Logarithmic (100 * Sqrt(10) : 1 range)
// 11: IEC 61966-2-4
// 12: ITU-R BT.1361 Extended Colour Gamut
// 13: IEC 61966-2-1 (sRGB or sYCC)
// 14: ITU-R BT.2020 10-bit system
// 15: ITU-R BT.2020 12-bit system
// 16: SMPTE ST 2084, ITU-R BT.2100 PQ
// 17: SMPTE ST 428-1
// 18: ARIB STD-B67 (HLG)
if (tc === "16") {
eotf = "pq";
}
else if (tc === "18") {
eotf = "hlg";
}
}
if (cp !== undefined && mc !== undefined && cp === "09" && mc === "09") {
colorSpace = "rec2020";
}
if (colorDepth === undefined || eotf === undefined) {
return undefined;
}
return { colorDepth, eotf, colorSpace };
}