feat(memo-editor): add compact live waveform recorder panel (#5817)

web/src/components/MemoEditor/components/AudioRecorderPanel.tsx

@@ -4,47 +4,55 @@ import { formatAudioTime } from "@/components/MemoMetadata/Attachment/attachment
 import { Button } from "@/components/ui/button";
 import { cn } from "@/lib/utils";
 import { useTranslate } from "@/utils/i18n";
+import { useAudioWaveform } from "../hooks/useAudioWaveform";
 import type { AudioRecorderPanelProps } from "../types/components";
+import { VoiceWaveform } from "./VoiceWaveform";
 
-export const AudioRecorderPanel: FC<AudioRecorderPanelProps> = ({ audioRecorder, onStop, onCancel }) => {
+export const AudioRecorderPanel: FC<AudioRecorderPanelProps> = ({ audioRecorder, mediaStream, onStop, onCancel }) => {
   const t = useTranslate();
   const { status, elapsedSeconds } = audioRecorder;
 
   const isRequestingPermission = status === "requesting_permission";
+  const isRecording = status === "recording";
+  const waveformLevels = useAudioWaveform(mediaStream, isRecording && mediaStream !== null);
+  const srStatusText = isRequestingPermission ? t("editor.audio-recorder.requesting-permission") : t("editor.audio-recorder.recording");
 
   return (
-    <div className="w-full rounded-lg border border-border/60 bg-muted/20 px-2.5 py-2">
-      <div className="flex items-center gap-2">
-        <div className="min-w-0 flex flex-1 gap-2">
-          <div className="truncate text-sm font-medium text-foreground">
-            {isRequestingPermission ? t("editor.audio-recorder.requesting-permission") : t("editor.audio-recorder.recording")}
-          </div>
-          <div
-            className={cn(
-              "inline-flex shrink-0 items-center gap-1.5 rounded-full px-2 py-0.5 text-xs font-medium",
-              isRequestingPermission
-                ? "border border-border/60 bg-background text-muted-foreground"
-                : "border border-destructive/20 bg-destructive/[0.08] text-destructive",
-            )}
-          >
-            {isRequestingPermission ? (
-              <LoaderCircleIcon className="size-3 animate-spin" />
-            ) : (
-              <span className="size-2 rounded-full bg-destructive" />
-            )}
-            {formatAudioTime(elapsedSeconds)}
-          </div>
-        </div>
+    <div
+      className={cn(
+        "flex w-full items-center justify-between gap-2 rounded-lg border border-border bg-muted/30 px-2.5 py-1.5",
+        "dark:bg-muted/20",
+      )}
+    >
+      <div className="flex min-w-0 flex-1 items-center gap-2">
+        {isRequestingPermission ? <LoaderCircleIcon className="size-3.5 shrink-0 animate-spin text-muted-foreground" aria-hidden /> : null}
+        <span className="sr-only">{srStatusText}</span>
+        <VoiceWaveform levels={waveformLevels} className="max-w-[200px] overflow-hidden" />
+        <span className="shrink-0 font-mono text-xs tabular-nums text-muted-foreground">{formatAudioTime(elapsedSeconds)}</span>
+      </div>
 
-        <div className="ml-auto flex shrink-0 items-center gap-1">
-          <Button variant="ghost" size="sm" onClick={onCancel} aria-label={t("common.cancel")}>
-            <XIcon className="size-4" />
-          </Button>
-          <Button size="sm" className="gap-1.5" onClick={onStop} disabled={isRequestingPermission}>
-            <span className="size-2.5 rounded-[2px] bg-current" aria-hidden="true" />
-            {t("editor.audio-recorder.stop")}
-          </Button>
-        </div>
+      <div className="flex shrink-0 items-center gap-1 border-l border-border/60 pl-2">
+        <Button
+          type="button"
+          variant="ghost"
+          size="icon"
+          className="size-7 shrink-0 rounded-full text-muted-foreground hover:bg-accent hover:text-foreground"
+          onClick={onCancel}
+          aria-label={t("common.cancel")}
+        >
+          <XIcon className="size-3.25" />
+        </Button>
+        <Button
+          type="button"
+          variant="destructive"
+          size="icon"
+          className="size-7 shrink-0 rounded-full shadow-xs"
+          onClick={onStop}
+          disabled={isRequestingPermission}
+          aria-label={t("editor.audio-recorder.stop")}
+        >
+          <span className="size-[7px] rounded-[1.5px] bg-destructive-foreground" aria-hidden />
+        </Button>
       </div>
     </div>
   );

web/src/components/MemoEditor/components/VoiceWaveform.tsx

+import type { FC } from "react";
+import { cn } from "@/lib/utils";
+
+/** Max half-height of each bar (px); bars are centered vertically. */
+const MAX_BAR_PX = 11;
+const MIN_BAR_PX = 2;
+
+type VoiceWaveformProps = {
+  levels: number[];
+  className?: string;
+};
+
+/**
+ * Tight-packed vertical bars (rounded caps): fixed bar width + minimal gap — no `flex-1` columns
+ * so bars stay visually dense like compact voice-memo waveforms.
+ */
+export const VoiceWaveform: FC<VoiceWaveformProps> = ({ levels, className }) => {
+  return (
+    <div className={cn("flex h-5 w-max max-w-full shrink-0 items-center gap-px", className)} aria-hidden>
+      {levels.map((level, i) => {
+        const h = Math.max(MIN_BAR_PX, level * MAX_BAR_PX);
+        const centerDistance = Math.abs(i - (levels.length - 1) / 2) / (levels.length / 2);
+        const opacity = 0.35 + (1 - centerDistance) * 0.35;
+        return (
+          <span
+            key={`bar-${i}`}
+            className="w-[2px] shrink-0 rounded-full bg-muted-foreground transition-[height,opacity] duration-75 ease-out"
+            style={{ height: `${h}px`, opacity }}
+          />
+        );
+      })}
+    </div>
+  );
+};

web/src/components/MemoEditor/hooks/index.ts

 // Custom hooks for MemoEditor (internal use only)
 export { useAudioRecorder } from "./useAudioRecorder";
+export { useAudioWaveform } from "./useAudioWaveform";
 export { useAutoSave } from "./useAutoSave";
 export { useBlobUrls } from "./useBlobUrls";
 export { useDragAndDrop } from "./useDragAndDrop";

web/src/components/MemoEditor/hooks/useAudioRecorder.ts

-import { useEffect, useRef } from "react";
+import { useEffect, useRef, useState } from "react";
 import type { LocalFile } from "../types/attachment";
 import { useBlobUrls } from "./useBlobUrls";
 
@@ -50,6 +50,7 @@ function createRecordedFile(blob: Blob, mimeType: string): File {
 export const useAudioRecorder = (actions: AudioRecorderActions) => {
   const mediaRecorderRef = useRef<MediaRecorder | null>(null);
   const mediaStreamRef = useRef<MediaStream | null>(null);
+  const [recordingStream, setRecordingStream] = useState<MediaStream | null>(null);
   const chunksRef = useRef<Blob[]>([]);
   const startedAtRef = useRef<number | null>(null);
   const elapsedTimerRef = useRef<number | null>(null);
@@ -67,6 +68,7 @@ export const useAudioRecorder = (actions: AudioRecorderActions) => {
   const cleanupStream = () => {
     mediaStreamRef.current?.getTracks().forEach((track) => track.stop());
     mediaStreamRef.current = null;
+    setRecordingStream(null);
   };
 
   const resetRecorderRefs = () => {
@@ -130,6 +132,7 @@ export const useAudioRecorder = (actions: AudioRecorderActions) => {
 
       recorderMimeTypeRef.current = mimeType;
       mediaStreamRef.current = stream;
+      setRecordingStream(stream);
       mediaRecorderRef.current = mediaRecorder;
       chunksRef.current = [];
 
@@ -221,5 +224,6 @@ export const useAudioRecorder = (actions: AudioRecorderActions) => {
     startRecording,
     stopRecording,
     resetRecording,
+    recordingStream,
   };
 };

web/src/components/MemoEditor/hooks/useAudioWaveform.ts

+import { useEffect, useState } from "react";
+
+const BAR_COUNT = 40;
+const IDLE_LEVEL = 0.08;
+const UPDATE_MS = 33;
+const CENTER_EMPHASIS = 0.35;
+const BOOST_OFFSET = 0.04;
+const BOOST_CURVE = 0.55;
+const BOOST_GAIN = 2.8;
+
+const createIdleLevels = (): number[] => Array.from({ length: BAR_COUNT }, () => IDLE_LEVEL);
+
+const clamp01 = (value: number): number => Math.min(1, Math.max(0, value));
+
+function computeLevels(dataArray: Uint8Array, bufferLength: number): number[] {
+  const sampled: number[] = [];
+  for (let i = 0; i < BAR_COUNT; i++) {
+    const start = Math.floor((i / BAR_COUNT) * bufferLength);
+    const end = Math.floor(((i + 1) / BAR_COUNT) * bufferLength);
+    let sum = 0;
+    for (let j = start; j < end; j++) {
+      sum += dataArray[j];
+    }
+    const span = Math.max(1, end - start);
+    const avg = sum / (255 * span);
+    const boosted = Math.min(1, (avg + BOOST_OFFSET) ** BOOST_CURVE * BOOST_GAIN);
+    sampled.push(Math.max(IDLE_LEVEL, boosted));
+  }
+
+  const mirrored: number[] = [];
+  for (let i = 0; i < BAR_COUNT; i++) {
+    const j = BAR_COUNT - 1 - i;
+    const v = (sampled[i] + sampled[j]) / 2;
+    const centerDistance = Math.abs(i - (BAR_COUNT - 1) / 2) / (BAR_COUNT / 2);
+    const envelope = 1 - centerDistance * CENTER_EMPHASIS;
+    mirrored.push(Math.max(IDLE_LEVEL, clamp01(v * envelope)));
+  }
+
+  for (let i = 1; i < BAR_COUNT - 1; i++) {
+    mirrored[i] = Math.max(IDLE_LEVEL, (mirrored[i - 1] + mirrored[i] * 2 + mirrored[i + 1]) / 4);
+  }
+
+  return mirrored;
+}
+
+/**
+ * Derives normalized bar levels (0–1) from a microphone MediaStream for live waveform UI.
+ */
+export function useAudioWaveform(stream: MediaStream | null, enabled: boolean): number[] {
+  const [levels, setLevels] = useState<number[]>(createIdleLevels);
+
+  useEffect(() => {
+    if (!enabled || !stream) {
+      setLevels(createIdleLevels());
+      return;
+    }
+
+    const audioContext = new AudioContext();
+    const source = audioContext.createMediaStreamSource(stream);
+    const analyser = audioContext.createAnalyser();
+    analyser.fftSize = 512;
+    analyser.minDecibels = -72;
+    analyser.maxDecibels = -8;
+    analyser.smoothingTimeConstant = 0.72;
+    source.connect(analyser);
+
+    const bufferLength = analyser.frequencyBinCount;
+    const dataArray = new Uint8Array(bufferLength);
+    let rafId = 0;
+    let lastEmit = 0;
+    let first = true;
+
+    const tick = (now: number) => {
+      analyser.getByteFrequencyData(dataArray);
+      if (first || now - lastEmit >= UPDATE_MS) {
+        first = false;
+        lastEmit = now;
+        setLevels(computeLevels(dataArray, bufferLength));
+      }
+      rafId = requestAnimationFrame(tick);
+    };
+
+    const start = async () => {
+      await audioContext.resume();
+      rafId = requestAnimationFrame(tick);
+    };
+
+    void start();
+
+    return () => {
+      cancelAnimationFrame(rafId);
+      source.disconnect();
+      analyser.disconnect();
+      void audioContext.close();
+    };
+  }, [stream, enabled]);
+
+  return levels;
+}

web/src/components/MemoEditor/index.tsx

@@ -206,6 +206,7 @@ const MemoEditorImpl: React.FC<MemoEditorProps> = ({
         {isAudioRecorderOpen && (state.audioRecorder.status === "recording" || state.audioRecorder.status === "requesting_permission") && (
           <AudioRecorderPanel
             audioRecorder={state.audioRecorder}
+            mediaStream={audioRecorder.recordingStream}
             onStop={audioRecorder.stopRecording}
             onCancel={handleCancelAudioRecording}
           />

web/src/components/MemoEditor/types/components.ts

@@ -32,6 +32,8 @@ export interface EditorMetadataProps {
 
 export interface AudioRecorderPanelProps {
   audioRecorder: EditorState["audioRecorder"];
+  /** Active mic stream while recording; used for live waveform visualization. */
+  mediaStream: MediaStream | null;
   onStop: () => void;
   onCancel: () => void;
 }