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/**
* Copyright 2024 Google LLC
*
* 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.
*/
export type GetAudioContextOptions = AudioContextOptions & {
id?: string;
};
const map: Map<string, AudioContext> = new Map();
export const audioContext: (
options?: GetAudioContextOptions,
) => Promise<AudioContext> = (() => {
const didInteract = new Promise((res) => {
window.addEventListener("pointerdown", res, { once: true });
window.addEventListener("keydown", res, { once: true });
});
return async (options?: GetAudioContextOptions) => {
try {
const a = new Audio();
a.src =
"data:audio/wav;base64,UklGRigAAABXQVZFZm10IBIAAAABAAEARKwAAIhYAQACABAAAABkYXRhAgAAAAEA";
await a.play();
if (options?.id && map.has(options.id)) {
const ctx = map.get(options.id);
if (ctx) {
return ctx;
}
}
const ctx = new AudioContext(options);
if (options?.id) {
map.set(options.id, ctx);
}
return ctx;
} catch (e) {
await didInteract;
if (options?.id && map.has(options.id)) {
const ctx = map.get(options.id);
if (ctx) {
return ctx;
}
}
const ctx = new AudioContext(options);
if (options?.id) {
map.set(options.id, ctx);
}
return ctx;
}
};
})();
export const blobToJSON = (blob: Blob) =>
new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onload = () => {
if (reader.result) {
const json = JSON.parse(reader.result as string);
resolve(json);
} else {
reject("oops");
}
};
reader.readAsText(blob);
});
export function base64ToArrayBuffer(base64: string) {
var binaryString = atob(base64);
var bytes = new Uint8Array(binaryString.length);
for (let i = 0; i < binaryString.length; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
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