79 lines
2.4 KiB
TypeScript
79 lines
2.4 KiB
TypeScript
/**
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* Functions imported from JS into Ruffle.
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*
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* @ignore
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* @internal
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*/
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/**
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* Copies data into the given audio channel.
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* This is necessary because Safari does not support `AudioBuffer.copyToChannel`.
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*
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* @internal
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*/
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export function copyToAudioBuffer(
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audioBuffer: AudioBuffer,
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leftData: ArrayLike<number>,
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rightData: ArrayLike<number>,
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): void {
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if (leftData) {
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const dstBuffer = audioBuffer.getChannelData(0);
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dstBuffer.set(leftData);
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}
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if (rightData) {
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const dstBuffer = audioBuffer.getChannelData(1);
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dstBuffer.set(rightData);
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}
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}
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/**
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* Returns the estimated output timestamp for the audio context.
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* This is necessary because web-sys does not export `AudioContext.baseLatency`.
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*
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* @internal
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*/
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export function getAudioOutputTimestamp(context: AudioContext): number {
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// TODO: Ideally we'd use `context.getOutputTimestamp`, but this is broken as of Safari 15.4.
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return context.currentTime - context.baseLatency;
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}
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/**
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* Copies interleaved stereo audio data into an `AudioBuffer`.
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*
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* @internal
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*/
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export function copyToAudioBufferInterleaved(
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audioBuffer: AudioBuffer,
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interleavedData: ArrayLike<number>,
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): void {
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const numSamples = audioBuffer.length;
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const leftBuffer = audioBuffer.getChannelData(0);
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const rightBuffer = audioBuffer.getChannelData(1);
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let i = 0;
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let sample = 0;
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while (sample < numSamples) {
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leftBuffer[sample] = interleavedData[i]!;
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rightBuffer[sample] = interleavedData[i + 1]!;
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sample++;
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i += 2;
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}
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}
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/**
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* Performs the ActionScript `ExternalInterface.call(name, ...values)`
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*
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* @internal
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*/
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// @ts-expect-error defined but not used
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// eslint-disable-next-line @typescript-eslint/no-explicit-any,@typescript-eslint/no-unused-vars
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export function callExternalInterface(name: string, args: any[]): any {
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// [NA] Yes, this is direct eval. Yes, this is a Bad Thing when it comes to security.
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// In fact, yes this is vulnerable to an XSS attack!
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// But plot twist: Flash allowed for this and many games *rely on it*. :(
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// Flash content can do `call("eval", "....")` regardless, this doesn't enable anything that wasn't already permitted.
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// It just goes against what the documentation says, and *looks* really suspicious.
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// Content can only run this if the website has enabled `allowScriptAccess`, so it has to be enabled by the website too.
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return eval(`(${name})(...args)`);
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}
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