Refactor oscilloscope UI

- Rename ControlPanel to OscilloscopeControls for clarity
- Integrate live audio playback with a progress bar and time display
- Remove MP4 export; WebM only with updated export options
- Align oscilloscope components to use shared audio analyzer context
- Enable immediate oscilloscope initialization and live display modes (Combined/XY)
- Improve styling and responsive sizing of mini/full oscilloscope views

X-Lovable-Edit-ID: edt-28a85a31-f522-4420-8353-3be1a784d5c4

src/components/Oscilloscope.tsx

@@ -1,13 +1,21 @@
 import { useState, useCallback, useEffect, useRef } from 'react';
 import { AudioUploader } from './AudioUploader';
-import { ControlPanel, LiveDisplaySettings } from './ControlPanel';
+import { OscilloscopeControls, LiveDisplaySettings } from './OscilloscopeControls';
 import { OscilloscopeDisplay } from './OscilloscopeDisplay';
 import { useAudioAnalyzer } from '@/hooks/useAudioAnalyzer';
 import { useOscilloscopeRenderer } from '@/hooks/useOscilloscopeRenderer';
 import { useVideoExporter } from '@/hooks/useVideoExporter';
 import { useSettings } from '@/contexts/SettingsContext';
-import { Mic, MicOff } from 'lucide-react';
+import { Mic, MicOff, Pause, Play } from 'lucide-react';
 import { Button } from '@/components/ui/button';
+import { Slider } from '@/components/ui/slider';
+
+// Format time in mm:ss format
+const formatTime = (seconds: number): string => {
+  const mins = Math.floor(seconds / 60);
+  const secs = Math.floor(seconds % 60);
+  return `${mins}:${secs.toString().padStart(2, '0')}`;
+};
 
 export function Oscilloscope() {
   const [mode, setMode] = useState<'combined' | 'separate' | 'all'>('combined');
@@ -19,13 +27,12 @@ export function Oscilloscope() {
   });
   const [isMicActive, setIsMicActive] = useState(false);
   const [isPlaying, setIsPlaying] = useState(false);
-  const [currentSample, setCurrentSample] = useState(0);
+  const [currentTime, setCurrentTime] = useState(0);
   const [playbackSpeed, setPlaybackSpeed] = useState(1);
   const [isLooping, setIsLooping] = useState(false);
   const [seekPosition, setSeekPosition] = useState(0);
   const [exportResolution, setExportResolution] = useState<'640x480' | '1280x720' | '1920x1080'>('1920x1080');
   const [exportFps, setExportFps] = useState<24 | 30 | 60>(60);
-  const [exportFormat, setExportFormat] = useState<'webm' | 'mp4'>('webm');
   const [exportQuality, setExportQuality] = useState<'low' | 'medium' | 'high'>('medium');
   const [showMicCalibration, setShowMicCalibration] = useState(false);
   const [micLevel, setMicLevel] = useState(0);
@@ -33,6 +40,10 @@ export function Oscilloscope() {
   const [micGainNode, setMicGainNode] = useState<GainNode | null>(null);
   const isMicActiveRef = useRef(false);
   
+  // Audio playback refs
+  const audioRef = useRef<HTMLAudioElement | null>(null);
+  const audioUrlRef = useRef<string | null>(null);
+
   const { audioData, isLoading, fileName, originalFile, loadAudioFile, reset: resetAudio } = useAudioAnalyzer();
   const { isExporting, progress, exportedUrl, exportVideo, reset: resetExport } = useVideoExporter();
   const { playSound } = useSettings();
@@ -48,6 +59,70 @@ export function Oscilloscope() {
   const [micStream, setMicStream] = useState<MediaStream | null>(null);
   const [micAnalyzer, setMicAnalyzer] = useState<AnalyserNode | null>(null);
   
+  // Create audio element when file is loaded
+  useEffect(() => {
+    if (originalFile) {
+      // Clean up previous audio URL
+      if (audioUrlRef.current) {
+        URL.revokeObjectURL(audioUrlRef.current);
+      }
+      
+      // Create new audio element
+      const url = URL.createObjectURL(originalFile);
+      audioUrlRef.current = url;
+      
+      const audio = new Audio(url);
+      audio.loop = isLooping;
+      audio.playbackRate = playbackSpeed;
+      
+      audio.addEventListener('timeupdate', () => {
+        setCurrentTime(audio.currentTime);
+        if (audioData) {
+          const position = audio.currentTime / audioData.duration;
+          setSeekPosition(position);
+        }
+      });
+      
+      audio.addEventListener('ended', () => {
+        if (!isLooping) {
+          setIsPlaying(false);
+          setCurrentTime(0);
+          setSeekPosition(0);
+        }
+      });
+      
+      audioRef.current = audio;
+      
+      return () => {
+        audio.pause();
+        audio.src = '';
+        if (audioUrlRef.current) {
+          URL.revokeObjectURL(audioUrlRef.current);
+          audioUrlRef.current = null;
+        }
+      };
+    }
+  }, [originalFile, audioData]);
+  
+  // Update audio playback state
+  useEffect(() => {
+    if (audioRef.current) {
+      audioRef.current.loop = isLooping;
+      audioRef.current.playbackRate = playbackSpeed;
+    }
+  }, [isLooping, playbackSpeed]);
+  
+  // Handle play/pause
+  useEffect(() => {
+    if (audioRef.current) {
+      if (isPlaying) {
+        audioRef.current.play().catch(console.error);
+      } else {
+        audioRef.current.pause();
+      }
+    }
+  }, [isPlaying]);
+
   const handleFileSelect = useCallback((file: File) => {
     loadAudioFile(file);
     if (isMicActive) {
@@ -118,9 +193,10 @@ export function Oscilloscope() {
   }, [isPlaying, playSound]);
 
   const handleSeek = useCallback((position: number) => {
-    if (audioData && position >= 0) {
+    if (audioData && audioRef.current && position >= 0) {
-      const newSample = Math.floor(position * audioData.leftChannel.length);
+      const newTime = position * audioData.duration;
-      setCurrentSample(newSample);
+      audioRef.current.currentTime = newTime;
+      setCurrentTime(newTime);
       setSeekPosition(position);
     }
   }, [audioData]);
@@ -141,10 +217,6 @@ export function Oscilloscope() {
     setExportFps(fps as 24 | 30 | 60);
   }, []);
 
-  const handleExportFormatChange = useCallback((format: string) => {
-    setExportFormat(format as 'webm' | 'mp4');
-  }, []);
-
   const handleExportQualityChange = useCallback((quality: string) => {
     setExportQuality(quality as 'low' | 'medium' | 'high');
   }, []);
@@ -160,10 +232,9 @@ export function Oscilloscope() {
       fps: exportFps,
       mode,
       audioFile: originalFile,
-      format: exportFormat,
       quality: exportQuality,
     });
-  }, [audioData, originalFile, exportVideo, mode, exportResolution, exportFps, exportFormat, exportQuality]);
+  }, [audioData, originalFile, exportVideo, mode, exportResolution, exportFps, exportQuality]);
 
   const handleReset = useCallback(() => {
     playSound('click');
@@ -231,7 +302,7 @@ export function Oscilloscope() {
         </div>
 
         {/* Right Column: Control Panel */}
-        <ControlPanel
+        <OscilloscopeControls
           mode={mode}
           onModeChange={setMode}
           canGenerate={canGenerate}
@@ -251,8 +322,6 @@ export function Oscilloscope() {
           onExportResolutionChange={handleExportResolutionChange}
           exportFps={exportFps}
           onExportFpsChange={handleExportFpsChange}
-          exportFormat={exportFormat}
-          onExportFormatChange={handleExportFormatChange}
           exportQuality={exportQuality}
           onExportQualityChange={handleExportQualityChange}
           liveSettings={liveSettings}
@@ -261,7 +330,7 @@ export function Oscilloscope() {
       </div>
 
       {/* Oscilloscope Display */}
-      <div className="flex justify-center">
+      <div className="flex justify-center flex-col items-center gap-4">
         <OscilloscopeDisplay
           audioData={audioData}
           micAnalyzer={micAnalyzer}
@@ -270,10 +339,47 @@ export function Oscilloscope() {
           playbackSpeed={playbackSpeed}
           isLooping={isLooping}
           seekPosition={seekPosition}
-          onPlaybackEnd={() => setIsPlaying(false)}
+          onPlaybackEnd={() => {
+            setIsPlaying(false);
+            setCurrentTime(0);
+            setSeekPosition(0);
+          }}
           onSeek={handleSeek}
           liveSettings={liveSettings}
         />
+        
+        {/* Audio Playback Controls */}
+        {audioData && originalFile && (
+          <div className="w-full max-w-3xl space-y-2 px-4">
+            {/* Play/Pause and Time Display */}
+            <div className="flex items-center gap-4">
+              <Button
+                onClick={handlePreview}
+                variant="outline"
+                size="sm"
+                className="font-crt border-primary/50 hover:bg-primary/10"
+                disabled={isExporting}
+              >
+                {isPlaying ? <Pause size={16} /> : <Play size={16} />}
+              </Button>
+              
+              <span className="font-mono-crt text-sm text-foreground/80 min-w-[80px]">
+                {formatTime(currentTime)} / {formatTime(audioData.duration)}
+              </span>
+              
+              {/* Progress Bar */}
+              <div className="flex-1">
+                <Slider
+                  value={[seekPosition * 100]}
+                  onValueChange={(value) => handleSeek(value[0] / 100)}
+                  max={100}
+                  step={0.1}
+                  className="cursor-pointer"
+                />
+              </div>
+            </div>
+          </div>
+        )}
       </div>
 
       {/* Microphone Calibration */}

src/components/OscilloscopeControls.tsx

@@ -32,15 +32,13 @@ interface ControlPanelProps {
   onExportResolutionChange: (resolution: string) => void;
   exportFps: number;
   onExportFpsChange: (fps: number) => void;
-  exportFormat: string;
-  onExportFormatChange: (format: string) => void;
   exportQuality: string;
   onExportQualityChange: (quality: string) => void;
   liveSettings: LiveDisplaySettings;
   onLiveSettingsChange: (settings: LiveDisplaySettings) => void;
 }
 
-export function ControlPanel({
+export function OscilloscopeControls({
   mode,
   onModeChange,
   canGenerate,
@@ -60,8 +58,6 @@ export function ControlPanel({
   onExportResolutionChange,
   exportFps,
   onExportFpsChange,
-  exportFormat,
-  onExportFormatChange,
   exportQuality,
   onExportQualityChange,
   liveSettings,
@@ -251,19 +247,6 @@ export function ControlPanel({
           </select>
         </div>
 
-        {/* Format */}
-        <div className="flex items-center justify-between">
-          <span className="font-mono-crt text-sm text-foreground/90">Format</span>
-          <select
-            value={exportFormat}
-            onChange={(e) => onExportFormatChange(e.target.value)}
-            className="bg-background border border-primary/50 text-primary font-mono-crt text-sm px-2 py-1"
-          >
-            <option value="webm">WebM</option>
-            <option value="mp4">MP4</option>
-          </select>
-        </div>
-
         {/* Quality */}
         <div className="flex items-center justify-between">
           <span className="font-mono-crt text-sm text-foreground/90">Quality</span>
@@ -338,8 +321,8 @@ export function ControlPanel({
 
       {/* Info */}
       <div className="text-xs text-muted-foreground font-mono-crt space-y-1 pt-4 border-t border-border">
-        <p>Output: 1920×1080 WebM</p>
+        <p>Output: WebM (VP9)</p>
-        <p>Frame Rate: 60 FPS</p>
+        <p>Quality affects video bitrate</p>
         <p>Supports files up to 6+ hours</p>
       </div>
     </div>

src/components/OscilloscopeDisplay.tsx

@@ -2,7 +2,7 @@ import { useEffect, useRef, useCallback } from 'react';
 import type { AudioData } from '@/hooks/useAudioAnalyzer';
 import type { OscilloscopeMode } from '@/hooks/useOscilloscopeRenderer';
 import { useAudioAnalyzer as useSharedAudioAnalyzer } from '@/contexts/AudioAnalyzerContext';
-import type { LiveDisplaySettings } from './ControlPanel';
+import type { LiveDisplaySettings } from './OscilloscopeControls';
 
 interface OscilloscopeDisplayProps {
   audioData: AudioData | null;