From cca970c34830c78088c4af72672bffb6d59731db Mon Sep 17 00:00:00 2001
From: 3dtours <yeunhiepanh.photo@gmail.com>
Date: Sun, 26 Jul 2026 20:09:22 +0700
Subject: [PATCH] fix: selectInstrument auto-inits SpessaSynth if not ready
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Root cause: selectInstrument called before getAudioContext triggers init.
_initialized=false → selectInstrument returns immediately → no sound bank.
Fix: selectInstrument creates AudioContext + calls init() if not ready,
waits for completion before proceeding with bank/program routing.
---
 app/static/js/services/soundfontPlayer.js | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/app/static/js/services/soundfontPlayer.js b/app/static/js/services/soundfontPlayer.js
index 3404253..8faea4a 100644
--- a/app/static/js/services/soundfontPlayer.js
+++ b/app/static/js/services/soundfontPlayer.js
@@ -188,9 +188,22 @@
         // ════════════════════════════════════════════════
         selectInstrument: async function (channel, bank, program, sfId) {
             console.log("[SonicSF][DEBUG] PHASE3: selectInstrument ch=" + channel + " bank=" + bank + " prog=" + program + " sf=" + sfId + " _initialized=" + _initialized);
+            // Auto-init: create AudioContext + init SpessaSynth if not ready
             if (!_initialized || !_synthInstance) {
-                console.log("[SonicSF][DEBUG] PHASE3: engine not ready, returning");
-                return;
+                console.log("[SonicSF][DEBUG] PHASE3: engine not ready, triggering init...");
+                try {
+                    const ctx = new (window.AudioContext || window.webkitAudioContext)();
+                    if (ctx.state === 'suspended') await ctx.resume();
+                    await this.init(ctx);
+                } catch (e) {
+                    console.error("[SonicSF][DEBUG] PHASE3: auto-init failed:", e);
+                    return;
+                }
+                if (!_initialized || !_synthInstance) {
+                    console.warn("[SonicSF][DEBUG] PHASE3: engine still not ready after auto-init");
+                    return;
+                }
+                console.log("[SonicSF][DEBUG] PHASE3: auto-init complete");
             }
             // Phase 2 first: ensure SoundFont is loaded
             if (sfId) {