From 14c3bfe09f906e9b80d6100b126e59c9a88ac976 Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Wed, 18 Feb 2026 05:38:45 +0100
Subject: feat(mq_editor): add Test WAV button for in-browser UI testing

Generates 2s of 440+660Hz (A4+E5) at 32kHz without needing a file.
Refactors WAV load path into shared loadAudioBuffer() used by both
file input and the test button.

handoff(Gemini): test button wired, full UI pipeline testable without assets.
---
 tools/mq_editor/index.html | 56 +++++++++++++++++++++++++++++++---------------
 1 file changed, 38 insertions(+), 18 deletions(-)

(limited to 'tools')

diff --git a/tools/mq_editor/index.html b/tools/mq_editor/index.html
index d7cec6a..1ebc0d3 100644
--- a/tools/mq_editor/index.html
+++ b/tools/mq_editor/index.html
@@ -73,6 +73,7 @@
 
   <div class="toolbar">
     <input type="file" id="wavFile" accept=".wav">
+    <button id="testWavBtn">⚗ Test WAV</button>
     <button id="extractBtn" disabled>Extract Partials</button>
     <button id="playBtn" disabled>▶ Play</button>
     <button id="stopBtn" disabled>■ Stop</button>
@@ -142,6 +143,22 @@
       }
     }
 
+    // Shared: initialize editor from an AudioBuffer
+    function loadAudioBuffer(buffer, label) {
+      audioBuffer = buffer;
+      initAudioContext();
+      extractBtn.disabled = false;
+      playBtn.disabled = false;
+      setStatus('Computing STFT cache...', 'info');
+
+      setTimeout(() => {
+        const signal = audioBuffer.getChannelData(0);
+        stftCache = new STFTCache(signal, audioBuffer.sampleRate, fftSize, parseInt(hopSize.value));
+        setStatus(`${label} — ${audioBuffer.duration.toFixed(2)}s, ${audioBuffer.sampleRate}Hz, ${audioBuffer.numberOfChannels}ch (${stftCache.getNumFrames()} frames cached)`, 'info');
+        viewer = new SpectrogramViewer(canvas, audioBuffer, stftCache);
+      }, 10);
+    }
+
     // Load WAV file
     wavFile.addEventListener('change', async (e) => {
       const file = e.target.files[0];
@@ -150,30 +167,33 @@
       setStatus('Loading WAV...', 'info');
       try {
         const arrayBuffer = await file.arrayBuffer();
-        const audioContext = new AudioContext();
-        audioBuffer = await audioContext.decodeAudioData(arrayBuffer);
-
-        initAudioContext();
-        extractBtn.disabled = false;
-        playBtn.disabled = false;
-        setStatus('Computing STFT cache...', 'info');
-
-        // Compute STFT cache
-        setTimeout(() => {
-          const signal = audioBuffer.getChannelData(0);
-          stftCache = new STFTCache(signal, audioBuffer.sampleRate, fftSize, parseInt(hopSize.value));
-
-          setStatus(`Loaded: ${audioBuffer.duration.toFixed(2)}s, ${audioBuffer.sampleRate}Hz, ${audioBuffer.numberOfChannels}ch (${stftCache.getNumFrames()} frames cached)`, 'info');
-
-          // Create viewer with cache
-          viewer = new SpectrogramViewer(canvas, audioBuffer, stftCache);
-        }, 10);
+        const ctx = new AudioContext();
+        const buf = await ctx.decodeAudioData(arrayBuffer);
+        loadAudioBuffer(buf, `Loaded: ${file.name}`);
       } catch (err) {
         setStatus('Error loading WAV: ' + err.message, 'error');
         console.error(err);
       }
     });
 
+    // Test WAV: generate synthetic signal (two sine waves) in-memory
+    document.getElementById('testWavBtn').addEventListener('click', () => {
+      initAudioContext();
+      const SR = 32000;
+      const duration = 2.0;
+      const numSamples = SR * duration;
+
+      // Two sine waves: 440 Hz (A4) + 660 Hz (E5, perfect fifth), equal amplitude
+      const buf = audioContext.createBuffer(1, numSamples, SR);
+      const data = buf.getChannelData(0);
+      for (let i = 0; i < numSamples; ++i) {
+        data[i] = 0.5 * Math.sin(2 * Math.PI * 440 * i / SR)
+                + 0.5 * Math.sin(2 * Math.PI * 660 * i / SR);
+      }
+
+      loadAudioBuffer(buf, 'Test WAV: 440Hz + 660Hz (2s, 32kHz)');
+    });
+
     // Update cache when hop size changes
     hopSize.addEventListener('change', () => {
       if (stftCache) {
-- 
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