40 lines
2.4 KiB
JavaScript
40 lines
2.4 KiB
JavaScript
(() => {
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function createPlaybackCapabilities(environment, video, agent) {
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const touchApple = /iPad|iPhone|iPod/i.test(agent.userAgent || '') || /Mac/i.test(agent.platform || '') && Number(agent.maxTouchPoints) > 1;
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function native() {
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if (touchApple) return true;
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try {return ['application/vnd.apple.mpegurl', 'application/x-mpegURL'].some(type => ['maybe', 'probably'].includes(video.canPlayType(type)));}
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catch (_) {return false;}
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}
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function mse(type) {
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try {return typeof type === 'string' && Boolean(type) && typeof environment.MediaSource === 'function' && typeof environment.MediaSource.isTypeSupported === 'function' && environment.MediaSource.isTypeSupported(type);}
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catch (_) {return false;}
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}
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function choose(type) {
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if (touchApple && native()) return 'hls';
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if (mse(type)) return 'mse';
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return native() ? 'hls' : '';
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}
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function remux() {
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return !touchApple && ['42E02A', '4D002A', '64002A'].every(profile => mse('video/mp4; codecs="avc1.' + profile + ', mp4a.40.2"'));
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}
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function playable(type) {
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try {return ['maybe', 'probably'].includes(video.canPlayType(type));} catch (_) {return false;}
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}
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function describe() {
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const supported = type => playable(type) || mse(type);
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const videoCodecs = {h264: 'avc1.42E01E', hevc: 'hvc1.1.6.L120.B0', av1: 'av01.0.08M.08', vp9: 'vp09.00.10.08'};
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const audioCodecs = {aac: 'mp4a.40.2', mp3: 'mp4a.69', ac3: 'ac-3', eac3: 'ec-3', opus: 'opus'};
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// iOS 上的第三方浏览器（Chrome/Firefox/Edge/Opera）自带的媒体栈对 fMP4 HLS 兼容性差，
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// 会黑屏缓冲；让服务端按无 HLS 通道规划，走 legacy 的 TS 实时转码（hls/open）。
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const thirdPartyIOS = touchApple && /CriOS|FxiOS|EdgiOS|OPT\//.test(agent.userAgent || '');
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return {mp4: playable('video/mp4'), nativeHls: native() && !thirdPartyIOS, hlsjs: Boolean(environment.Hls?.isSupported()),
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video: Object.keys(videoCodecs).filter(key => supported('video/mp4; codecs="' + videoCodecs[key] + '"')),
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audio: Object.keys(audioCodecs).filter(key => supported('audio/mp4; codecs="' + audioCodecs[key] + '"'))};
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}
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return {native, mse, choose, remux, playable, describe};
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}
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if (typeof module !== 'undefined' && module.exports) module.exports = createPlaybackCapabilities;
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else window.JukuPlaybackCapabilities = createPlaybackCapabilities;
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})();
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