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import { getMediaSource } from './utils/mediasource-helper';
import type { ExtendedSourceBuffer } from './types/buffer';
function getSourceBuffer(): typeof self.SourceBuffer {
return self.SourceBuffer || (self as any).WebKitSourceBuffer;
}
/**
* @ignore
*/
export function isSupported(): boolean {
const mediaSource = getMediaSource();
if (!mediaSource) {
return false;
}
const sourceBuffer = getSourceBuffer();
const isTypeSupported =
mediaSource &&
typeof mediaSource.isTypeSupported === 'function' &&
mediaSource.isTypeSupported('video/mp4; codecs="avc1.42E01E,mp4a.40.2"');
// if SourceBuffer is exposed ensure its API is valid
// Older browsers do not expose SourceBuffer globally so checking SourceBuffer.prototype is impossible
const sourceBufferValidAPI =
!sourceBuffer ||
(sourceBuffer.prototype &&
typeof sourceBuffer.prototype.appendBuffer === 'function' &&
typeof sourceBuffer.prototype.remove === 'function');
return !!isTypeSupported && !!sourceBufferValidAPI;
}
/**
* @ignore
*/
export function changeTypeSupported(): boolean {
const sourceBuffer = getSourceBuffer();
return (
typeof (sourceBuffer?.prototype as ExtendedSourceBuffer)?.changeType ===
'function'
);
}