rx-player
Version:
Canal+ HTML5 Video Player
87 lines (86 loc) • 3.27 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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = takePSSHOut;
exports.getPsshSystemID = getPsshSystemID;
var log_1 = require("../../../log");
var slice_uint8array_1 = require("../../../utils/slice_uint8array");
var string_parsing_1 = require("../../../utils/string_parsing");
var get_box_1 = require("./get_box");
/**
* Replace every PSSH box from an ISOBMFF segment by FREE boxes and returns the
* removed PSSH in an array.
* Useful to manually manage encryption while avoiding the round-trip with the
* browser's encrypted event.
* @param {Uint8Array} data - the ISOBMFF segment
* @returns {Array.<Uint8Array>} - The extracted PSSH boxes. In the order they
* are encountered.
*/
function takePSSHOut(data) {
var i = 0;
var moov = (0, get_box_1.getBoxContent)(data, 0x6d6f6f76 /* moov */);
if (moov === null) {
return [];
}
var psshBoxes = [];
while (i < moov.length) {
var psshOffsets = void 0;
try {
psshOffsets = (0, get_box_1.getBoxOffsets)(moov, 0x70737368 /* pssh */);
}
catch (e) {
var err = e instanceof Error ? e : "";
log_1.default.warn("Error while removing PSSH from ISOBMFF", err);
return psshBoxes;
}
if (psshOffsets === null) {
return psshBoxes;
}
var pssh = (0, slice_uint8array_1.default)(moov, psshOffsets[0], psshOffsets[2]);
var systemId = getPsshSystemID(pssh, psshOffsets[1] - psshOffsets[0]);
if (systemId !== undefined) {
psshBoxes.push({ systemId: systemId, data: pssh });
}
// replace by `free` box.
moov[psshOffsets[0] + 4] = 0x66;
moov[psshOffsets[0] + 5] = 0x72;
moov[psshOffsets[0] + 6] = 0x65;
moov[psshOffsets[0] + 7] = 0x65;
i = psshOffsets[2];
}
return psshBoxes;
}
/**
* Parse systemId from a "pssh" box into an hexadecimal string.
* `undefined` if we could not extract a systemId.
* @param {Uint8Array} buff - The pssh box
* @param {number} initialDataOffset - offset of the first byte after the size
* and name in this pssh box.
* @returns {string|undefined}
*/
function getPsshSystemID(buff, initialDataOffset) {
if (buff[initialDataOffset] > 1) {
log_1.default.warn("ISOBMFF: un-handled PSSH version");
return undefined;
}
var offset = initialDataOffset + 4; /* version + flags */
if (offset + 16 > buff.length) {
return undefined;
}
var systemIDBytes = (0, slice_uint8array_1.default)(buff, offset, offset + 16);
return (0, string_parsing_1.bytesToHex)(systemIDBytes);
}