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/*
* Copyright © 2020 Luciano Iam <lucianito@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
import { ANode, Message } from './message.js';
import { MessageChannel } from './channel.js';
export class Ardour {
constructor () {
this._channel = new MessageChannel(location.host);
this._channel.errorCallback = (error) => this.errorCallback();
this._channel.messageCallback = (msg) => this._onChannelMessage(msg);
this._pendingRequest = null;
}
async open () {
this._channel.closeCallback = () => {
this.errorCallback(new Error('Message channel unexpectedly closed'));
};
await this._channel.open();
}
close () {
this._channel.closeCallback = () => {};
this._channel.close();
}
send (msg) {
this._channel.send(msg);
}
errorCallback (error) {
// empty
}
messageCallback (msg) {
// empty
}
// Surface metadata API over HTTP
async getAvailableSurfaces () {
const response = await fetch('/surfaces.json');
if (response.status == 200) {
return await response.json();
} else {
throw this._fetchResponseStatusError(response.status);
}
}
async getSurfaceManifest () {
const response = await fetch('manifest.xml');
if (response.status == 200) {
const xmlText = await response.text();
const xmlDoc = new DOMParser().parseFromString(xmlText, 'text/xml');
return {
name: xmlDoc.getElementsByTagName('Name')[0].getAttribute('value'),
description: xmlDoc.getElementsByTagName('Description')[0].getAttribute('value')
}
} else {
throw this._fetchResponseStatusError(response.status);
}
}
// Surface control API over WebSockets
// clients need to call open() before calling these methods
async getTempo () {
return (await this._sendAndReceive(ANode.TEMPO))[0];
}
async getStripGain (stripId) {
return (await this._sendAndReceive(ANode.STRIP_GAIN, [stripId]))[0];
}
async getStripPan (stripId) {
return (await this._sendAndReceive(ANode.STRIP_PAN, [stripId]))[0];
}
async getStripMute (stripId) {
return (await this._sendAndReceive(ANode.STRIP_MUTE, [stripId]))[0];
}
async getStripPluginEnable (stripId, pluginId) {
return (await this._sendAndReceive(ANode.STRIP_PLUGIN_ENABLE, [stripId, pluginId]))[0];
}
async getStripPluginParamValue (stripId, pluginId, paramId) {
return (await this._sendAndReceive(ANode.STRIP_PLUGIN_PARAM_VALUE, [stripId, pluginId, paramId]))[0];
}
setTempo (bpm) {
this._send(ANode.TEMPO, [], [bpm]);
}
setStripGain (stripId, db) {
this._send(ANode.STRIP_GAIN, [stripId], [db]);
}
setStripPan (stripId, value) {
this._send(ANode.STRIP_PAN, [stripId], [value]);
}
setStripMute (stripId, value) {
this._send(ANode.STRIP_MUTE, [stripId], [value]);
}
setStripPluginEnable (stripId, pluginId, value) {
this._send(ANode.STRIP_PLUGIN_ENABLE, [stripId, pluginId], [value]);
}
setStripPluginParamValue (stripId, pluginId, paramId, value) {
this._send(ANode.STRIP_PLUGIN_PARAM_VALUE, [stripId, pluginId, paramId], [value]);
}
// Private methods
_send (node, addr, val) {
const msg = new Message(node, addr, val);
this._channel.send(msg);
return msg;
}
async _sendAndReceive (node, addr, val) {
return new Promise((resolve, reject) => {
const hash = this._send(node, addr, val).hash;
this._pendingRequest = {resolve: resolve, hash: hash};
});
}
_onChannelMessage (msg) {
if (this._pendingRequest && (this._pendingRequest.hash == msg.hash)) {
this._pendingRequest.resolve(msg.val);
this._pendingRequest = null;
} else {
this.messageCallback(msg);
}
}
_fetchResponseStatusError (status) {
return new Error(`HTTP response status ${status}`);
}
}
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