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Adjust settings/docs for encoder

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This commit is contained in:
Travis Ralston 2021-03-23 18:24:40 -06:00
parent b7e653268b
commit c9938ff704
1 changed files with 7 additions and 3 deletions
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10
src/voice/VoiceRecorder.ts
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@ -22,8 +22,8 @@ import {SimpleObservable} from "matrix-widget-api";
const CHANNELS = 1; // stereo isn't important const CHANNELS = 1; // stereo isn't important
const SAMPLE_RATE = 48000; // 48khz is what WebRTC uses. 12khz is where we lose quality. const SAMPLE_RATE = 48000; // 48khz is what WebRTC uses. 12khz is where we lose quality.
const BITRATE = 64000; // 64kbps is average for WebRTC, so we might as well use it too. const BITRATE = 24000; // 24kbps is pretty high quality for our use case in opus.
const FREQ_SAMPLE_RATE = 4; // Target rate of frequency data. We don't need this super often. const FREQ_SAMPLE_RATE = 4; // Target rate of frequency data (samples / sec). We don't need this super often.
export interface IFrequencyPackage { export interface IFrequencyPackage {
dbBars: Float32Array; dbBars: Float32Array;
@ -75,7 +75,11 @@ export class VoiceRecorder {
numberOfChannels: CHANNELS, numberOfChannels: CHANNELS,
sourceNode: this.recorderSource, sourceNode: this.recorderSource,
encoderBitRate: BITRATE, encoderBitRate: BITRATE,
encoderComplexity: 3, // 0-10, 0 is fast and low complexity
// We use low values for the following to ease CPU usage - the resulting waveform
// is indistinguishable for a voice message. Note that the underlying library will
// pick defaults which prefer the highest possible quality, CPU be damned.
encoderComplexity: 3, // 0-10, 10 is slow and high quality.
resampleQuality: 3, // 0-10, 10 is slow and high quality resampleQuality: 3, // 0-10, 10 is slow and high quality
}); });
this.recorder.ondataavailable = (a: ArrayBuffer) => { this.recorder.ondataavailable = (a: ArrayBuffer) => {