106 lines
2.8 KiB
JavaScript
106 lines
2.8 KiB
JavaScript
/*
|
|
* Copyright 2023 Google LLC
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|
|
*/
|
|
|
|
import initModule from "../build/libapi.mjs";
|
|
|
|
export function rethrowIfCritical(err) {
|
|
// If it's precisely Error, it's a custom error; anything else - SyntaxError,
|
|
// WebAssembly.RuntimeError, TypeError, etc. - is treated as critical here.
|
|
if (err.constructor !== Error) {
|
|
throw err;
|
|
}
|
|
}
|
|
|
|
const INTERFACE_CLASS = 6; // PTP
|
|
const INTERFACE_SUBCLASS = 1; // MTP
|
|
|
|
let ModulePromise = null;
|
|
|
|
class Camera {
|
|
constructor() {
|
|
this.queue = Promise.resolve();
|
|
this.Module = null;
|
|
this.context = null;
|
|
}
|
|
|
|
async showCameraPicker() {
|
|
// @ts-ignore
|
|
await navigator.usb.requestDevice({
|
|
filters: [
|
|
{
|
|
classCode: INTERFACE_CLASS,
|
|
subclassCode: INTERFACE_SUBCLASS,
|
|
},
|
|
],
|
|
});
|
|
}
|
|
|
|
async connect() {
|
|
if (!ModulePromise) {
|
|
ModulePromise = initModule()
|
|
}
|
|
this.Module = await ModulePromise;
|
|
this.context = await new this.Module.Context();
|
|
}
|
|
|
|
async schedule(op) {
|
|
let res = this.queue.then(() => op(this.context));
|
|
this.queue = res.catch(rethrowIfCritical);
|
|
return res;
|
|
}
|
|
|
|
async disconnect() {
|
|
if (!this.context.isDeleted()) {
|
|
this.context.delete();
|
|
}
|
|
}
|
|
|
|
async getConfig() {
|
|
return this.schedule((context) => context.configToJS());
|
|
}
|
|
|
|
async getSupportedOps() {
|
|
if (this.context) {
|
|
return await this.context.supportedOps();
|
|
}
|
|
throw new Error("You need to connect to the camera first");
|
|
}
|
|
|
|
async setConfigValue(name, value) {
|
|
const uiTimeout = new Promise((resolve) => setTimeout(resolve, 800));
|
|
const setResult = this.schedule((context) =>
|
|
context.setConfigValue(name, value)
|
|
);
|
|
return Promise.all([setResult, uiTimeout]);
|
|
}
|
|
|
|
async capturePreviewAsBlob() {
|
|
return this.schedule((context) => context.capturePreviewAsBlob());
|
|
}
|
|
|
|
async captureImageAsFile() {
|
|
return this.schedule((context) => context.captureImageAsFile());
|
|
}
|
|
|
|
async consumeEvents() {
|
|
return this.schedule((context) => context.consumeEvents());
|
|
}
|
|
}
|
|
|
|
export { Camera };
|