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112 lines
2.9 KiB
112 lines
2.9 KiB
4 years ago
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.getHvcCodec = exports.getAvcCodec = exports.getAv1Codec = void 0;
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var _byteHelpers = require("./byte-helpers.js");
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// https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-syntax
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// https://developer.mozilla.org/en-US/docs/Web/Media/Formats/codecs_parameter#AV1
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var getAv1Codec = function getAv1Codec(bytes) {
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var codec = '';
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var profile = bytes[1] >>> 3;
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var level = bytes[1] & 0x1F;
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var tier = bytes[2] >>> 7;
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var highBitDepth = (bytes[2] & 0x40) >> 6;
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var twelveBit = (bytes[2] & 0x20) >> 5;
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var monochrome = (bytes[2] & 0x10) >> 4;
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var chromaSubsamplingX = (bytes[2] & 0x08) >> 3;
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var chromaSubsamplingY = (bytes[2] & 0x04) >> 2;
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var chromaSamplePosition = bytes[2] & 0x03;
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codec += profile + "." + (0, _byteHelpers.padStart)(level, 2, '0');
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if (tier === 0) {
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codec += 'M';
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} else if (tier === 1) {
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codec += 'H';
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}
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var bitDepth;
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if (profile === 2 && highBitDepth) {
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bitDepth = twelveBit ? 12 : 10;
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} else {
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bitDepth = highBitDepth ? 10 : 8;
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}
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codec += "." + (0, _byteHelpers.padStart)(bitDepth, 2, '0'); // TODO: can we parse color range??
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codec += "." + monochrome;
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codec += "." + chromaSubsamplingX + chromaSubsamplingY + chromaSamplePosition;
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return codec;
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};
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exports.getAv1Codec = getAv1Codec;
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var getAvcCodec = function getAvcCodec(bytes) {
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var profileId = (0, _byteHelpers.toHexString)(bytes[1]);
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var constraintFlags = (0, _byteHelpers.toHexString)(bytes[2] & 0xFC);
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var levelId = (0, _byteHelpers.toHexString)(bytes[3]);
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return "" + profileId + constraintFlags + levelId;
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};
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exports.getAvcCodec = getAvcCodec;
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var getHvcCodec = function getHvcCodec(bytes) {
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var codec = '';
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var profileSpace = bytes[1] >> 6;
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var profileId = bytes[1] & 0x1F;
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var tierFlag = (bytes[1] & 0x20) >> 5;
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var profileCompat = bytes.subarray(2, 6);
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var constraintIds = bytes.subarray(6, 12);
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var levelId = bytes[12];
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if (profileSpace === 1) {
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codec += 'A';
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} else if (profileSpace === 2) {
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codec += 'B';
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} else if (profileSpace === 3) {
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codec += 'C';
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}
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codec += profileId + "."; // ffmpeg does this in big endian
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var profileCompatVal = parseInt((0, _byteHelpers.toBinaryString)(profileCompat).split('').reverse().join(''), 2); // apple does this in little endian...
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if (profileCompatVal > 255) {
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profileCompatVal = parseInt((0, _byteHelpers.toBinaryString)(profileCompat), 2);
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}
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codec += profileCompatVal.toString(16) + ".";
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if (tierFlag === 0) {
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codec += 'L';
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} else {
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codec += 'H';
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}
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codec += levelId;
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var constraints = '';
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for (var i = 0; i < constraintIds.length; i++) {
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var v = constraintIds[i];
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if (v) {
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if (constraints) {
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constraints += '.';
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}
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constraints += v.toString(16);
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}
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}
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if (constraints) {
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codec += "." + constraints;
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}
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return codec;
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};
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exports.getHvcCodec = getHvcCodec;
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