ruffle/web/packages/core/src/ruffle-imports.ts

/**
 * Functions imported from JS into Ruffle.
 *
 * @ignore
 * @internal
 */

/**
 * Copies data into the given audio channel.
 * This is necessary because Safari does not support `AudioBuffer.copyToChannel`.
 *
 * @internal
 */
export function copyToAudioBuffer(
    audioBuffer: AudioBuffer,
    leftData: ArrayLike<number>,
    rightData: ArrayLike<number>
): void {
    if (leftData) {
        const dstBuffer = audioBuffer.getChannelData(0);
        dstBuffer.set(leftData);
    }

    if (rightData) {
        const dstBuffer = audioBuffer.getChannelData(1);
        dstBuffer.set(rightData);
    }
}

/**
 * Returns `AudioContext.getOutputTimestamp`, defaulting to `context.currentTime` if
 * `getOutputTimestamp` is unavailable. This is necessary because `web-sys` does not yet export
 * `AudioBuffer.copyToChannel`.
 *
 * @internal
 */
export function getAudioOutputTimestamp(context: AudioContext): number {
    const timestamp = context.getOutputTimestamp?.();
    return timestamp?.contextTime ?? context.currentTime - context.baseLatency;
}