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/* MikMod Web Audio library
(c) 2021 Carlos Rafael Gimenes das Neves.
https://github.com/sezero/mikmod
https://github.com/carlosrafaelgn/mikmod/tree/master/libmikmod/webaudio
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/
// https://developer.mozilla.org/en-US/docs/Web/API/AudioWorkletGlobalScope
// https://developer.mozilla.org/en-US/docs/Web/API/AudioWorkletProcessor/process
// https://developers.google.com/web/updates/2017/12/audio-worklet
// https://developers.google.com/web/updates/2018/06/audio-worklet-design-pattern
// https://github.com/GoogleChromeLabs/web-audio-samples/tree/main/audio-worklet
class LibMikModProcessor extends AudioWorkletProcessor {
// Due to both LibMikMod and AudioWorklet's nature we can
// have only one module loaded at a time...
private id = 0;
private ended = false;
public constructor() {
super();
this.port.onmessage = this.handleMessage.bind(this);
}
private postResponse(response: LibMikModResponse): void {
if (this.port)
this.port.postMessage(response);
}
private handleMessage(ev: MessageEvent): any {
const message = ev.data as LibMikModMessage;
if (!message)
return;
switch (message.messageId) {
case LibMikModMessageId.INIT:
if (message.id || this.id || LibMikMod.loaded || LibMikMod.loading || LibMikMod.loadErrorStr || !message.buffer)
break;
LibMikMod.init(message.buffer).then(() => {
this.ended = true;
this.id = -1;
this.postResponse({
id: LibMikMod.getVersion(),
messageId: LibMikModMessageId.INIT
});
}, () => {
this.ended = true;
this.id = -1;
this.postResponse({
id: 0,
messageId: LibMikModMessageId.INIT,
errorCode: -1,
errorStr: LibMikMod.loadErrorStr
});
});
break;
case LibMikModMessageId.LOAD_MODULE_BUFFER:
if (!message.id || this.id)
break;
this.id = message.id;
const result = LibMikMod.loadModule(sampleRate, message.buffer, message.options);
if (result) {
this.ended = true;
this.id = -1;
LibMikMod.stopModule();
this.postResponse({
id: message.id,
messageId: LibMikModMessageId.LOAD_MODULE_BUFFER,
errorCode: result,
errorStr: LibMikMod.getStrerr(result)
});
} else {
this.postResponse({
id: this.id,
messageId: LibMikModMessageId.LOAD_MODULE_BUFFER,
infoSongName: LibMikMod.getSongName(),
infoModType: LibMikMod.getModType(),
infoComment: LibMikMod.getComment()
});
}
break;
case LibMikModMessageId.CHANGE_GENERAL_OPTIONS:
if (message.id !== this.id)
break;
LibMikMod.changeGeneralOptions(message.options);
break;
case LibMikModMessageId.STOP_MODULE:
if (message.id !== this.id)
break;
this.ended = true;
this.id = -1;
LibMikMod.stopModule();
break;
}
}
public process(inputs: Float32Array[][], outputs: Float32Array[][], parameters: { [key: string]: Float32Array }): boolean {
if (this.ended)
return false;
if (!LibMikMod.process(outputs)) {
if (!this.ended) {
const id = this.id,
result = LibMikMod.getErrno();
this.ended = true;
this.id = -1;
LibMikMod.stopModule();
if (result)
this.postResponse({
id,
messageId: LibMikModMessageId.PLAYBACK_ERROR,
errorCode: result,
errorStr: LibMikMod.getStrerr(result)
});
else
this.postResponse({
id,
messageId: LibMikModMessageId.PLAYBACK_ENDED
});
}
return false;
}
return true;
}
}
registerProcessor("libmikmodprocessor", LibMikModProcessor);
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