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Ensure we capture an absolute maximum amount of audio samples

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We say the limit is 2 minutes, not 1m59s, so let's give the user that last frame.
This commit is contained in:
Travis Ralston 2021-04-27 23:30:54 -06:00
parent 617d74f9cd
commit f0ff2fc38d
1 changed files with 14 additions and 3 deletions
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17
src/voice/VoiceRecording.ts
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@ -217,8 +217,19 @@ export class VoiceRecording extends EventEmitter implements IDestroyable {
// Now that we've updated the data/waveform, let's do a time check. We don't want to
// go horribly over the limit. We also emit a warning state if needed.
const secondsLeft = TARGET_MAX_LENGTH - timeSeconds;
if (secondsLeft <= 0) {
//
// We use the recorder's perspective of time to make sure we don't cut off the last
// frame of audio, otherwise we end up with a 1:59 clip (119.68 seconds). This extra
// safety can allow us to overshoot the target a bit, but at least when we say 2min
// maximum we actually mean it.
//
// In testing, recorder time and worker time lag by about 400ms, which is roughly the
// time needed to encode a sample/frame.
//
// Ref for recorderSeconds: https://github.com/chris-rudmin/opus-recorder#instance-fields
const recorderSeconds = this.recorder.encodedSamplePosition / 48000;
const secondsLeft = TARGET_MAX_LENGTH - recorderSeconds;
if (secondsLeft < 0) { // go over to make sure we definitely capture that last frame
// noinspection JSIgnoredPromiseFromCall - we aren't concerned with it overlapping
this.stop();
} else if (secondsLeft <= TARGET_WARN_TIME_LEFT) {
@ -253,9 +264,9 @@ export class VoiceRecording extends EventEmitter implements IDestroyable {
}
// Disconnect the source early to start shutting down resources
await this.recorder.stop(); // stop first to flush the last frame
this.recorderSource.disconnect();
this.recorderWorklet.disconnect();
await this.recorder.stop();
// close the context after the recorder so the recorder doesn't try to
// connect anything to the context (this would generate a warning)