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Add sampleRate option for LiveAudioVisualizer #31

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Add sampleRate option for LiveAudioVisualizer #31

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9 changes: 8 additions & 1 deletion src/LiveAudioVisualizer/LiveAudioVisualizer.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,12 @@ export interface Props {
* Default: `0.4`
*/
smoothingTimeConstant?: number;
/**
* Sample rate of the internal AudioContext. Should be the same as the AudioContext associated with the media recorder.
* For more details {@link https://developer.mozilla.org/en-US/docs/Web/API/AudioContext MDN AudioContext}
* Default: 44100
*/
sampleRate?: number;
}

const LiveAudioVisualizer: (props: Props) => ReactElement = ({
Expand All @@ -88,6 +94,7 @@ const LiveAudioVisualizer: (props: Props) => ReactElement = ({
maxDecibels = -10,
minDecibels = -90,
smoothingTimeConstant = 0.4,
sampleRate = 44100,
}: Props) => {
const [context, setContext] = useState<AudioContext>();
const [audioSource, setAudioSource] = useState<MediaStreamAudioSourceNode>();
Expand All @@ -97,7 +104,7 @@ const LiveAudioVisualizer: (props: Props) => ReactElement = ({
useEffect(() => {
if (!mediaRecorder.stream) return;

const ctx = new AudioContext();
const ctx = new AudioContext({ sampleRate });
const analyserNode = ctx.createAnalyser();
setAnalyser(analyserNode);
analyserNode.fftSize = fftSize;
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