rx-player
Version:
Canal+ HTML5 Video Player
70 lines (69 loc) • 2.73 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.
*/
import isVTTCue from "../../../../compat/is_vtt_cue";
import bufferSourceToUint8 from "../../../../utils/buffer_source_to_uint8";
import { utf8ToStr } from "../../../../utils/string_parsing";
import getCueBlocks from "../get_cue_blocks";
import getStyleBlocks from "../get_style_blocks";
import parseCueBlock from "../parse_cue_block";
import parseStyleBlocks from "../parse_style_block";
import { getFirstLineAfterHeader } from "../utils";
import setSettingsOnCue from "./set_settings_on_cue";
import toNativeCue from "./to_native_cue";
// Simple VTT to ICompatVTTCue parser:
// Just parse cues and associated settings.
// Does not take into consideration STYLE and REGION blocks.
/**
* Parse whole WEBVTT file into an array of cues, to be inserted in a video's
* TrackElement.
* @param {string|BufferSource} input
* @param {Object} _context
* @param {Number} timeOffset
* @returns {Array.<ICompatVTTCue|TextTrackCue>}
*/
export default function parseWebVTTPlainTextToVTTCues(input, _context, timeOffset) {
let vttStr;
if (typeof input === "string") {
vttStr = input;
}
else {
// Assume UTF-8
vttStr = utf8ToStr(bufferSourceToUint8(input));
}
// WEBVTT authorize CRLF, LF or CR as line terminators
const lines = vttStr.split(/\r\n|\n|\r/);
if (!/^WEBVTT($| |\t)/.test(lines[0])) {
throw new Error("Can't parse WebVTT: Invalid file.");
}
const firstLineAfterHeader = getFirstLineAfterHeader(lines);
const cueBlocks = getCueBlocks(lines, firstLineAfterHeader);
const styleBlocks = getStyleBlocks(lines, firstLineAfterHeader);
const styles = parseStyleBlocks(styleBlocks);
const cues = [];
for (const cueBlock of cueBlocks) {
const cueObject = parseCueBlock(cueBlock, timeOffset);
if (cueObject !== null) {
const nativeCue = toNativeCue(cueObject, styles);
if (nativeCue !== null) {
if (isVTTCue(nativeCue)) {
setSettingsOnCue(cueObject.settings, nativeCue);
}
cues.push(nativeCue);
}
}
}
return cues;
}