runtime capture: registry heartbeat decodes live DSP tables (WIN 0.540658, freq-axis@48k, per-bin weights), rtsnap_fast/findctx/rtchunk infra

findctx.py

@@ -0,0 +1,33 @@
+import struct
+data=open('/tmp/snap_all.bin','rb').read()
+i=0; regs=[]
+while i+16<=len(data):
+    lo,sz,=struct.unpack_from('<QQ',data,i)
+    regs.append((lo,sz,data[i+16:i+16+sz]))
+    i+=16+sz
+def readabs(addr,n):
+    for lo,sz,body in regs:
+        if lo<=addr<lo+sz and addr-lo+n<=sz:
+            return body[addr-lo:addr-lo+n]
+    return None
+known={0x2a72600,0x2111140,0x2cd0fc0,0x29f2280,0x29fa300,0x2a02340,0x2a0a3c0,0x2a12400}
+cands=[]
+t0=len(regs)
+for ri,(lo,sz,body) in enumerate(regs):
+    if sz<0x541000: continue
+    # check every 8-aligned offset for the +0x540658 ptr direct
+    for off in range(0, sz-0x540660, 8):
+        b=body[off+0x540658:off+0x540660]
+        if len(b)<8: break
+        p=struct.unpack_from('<Q',b)[0]
+        if p in known:
+            base=lo+off
+            u24=readabs(base+0x24,4); u28=readabs(base+0x28,4)
+            f40=readabs(base+0x40,0x20); f58=readabs(base+0x58,0x20)
+            print('cand base=0x%x reg%d p=0x%x u24=%s u28=%s 40=%s'%(
+                base,ri,p,
+                struct.unpack('<f',u24)[0] if u24 else None,
+                struct.unpack('<f',u28)[0] if u28 else None,
+                [round(x,4) for x in struct.unpack('<4d',f40[:32])] if f40 else None))
+            cands.append(base)
+print('total cand',len(cands))