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

rtchunk.py

@@ -0,0 +1,50 @@
+import subprocess, os, glob, time, struct
+def mem_open(pid): return os.open(f'/proc/{pid}/mem', os.O_RDONLY)
+def find_host(proc, wait=120):
+    t0=time.time()
+    while time.time()-t0<wait:
+        for p in glob.glob('/proc/[0-9]*'):
+            try:
+                pid=int(os.path.basename(p))
+                cmd=open(f'/proc/{pid}/cmdline','rb').read().replace(b'\0',b' ').decode('utf8','replace')
+                maps=open(f'/proc/{pid}/maps').read()
+            except Exception: continue
+            if 'yabridge-host' in cmd and 'soothe2' in maps: return pid
+        time.sleep(0.05)
+    return None
+os.system("pkill -9 -x reaper 2>/dev/null; pkill -9 -f '[y]abridge' 2>/dev/null; sleep 1")
+proc=subprocess.Popen(['/usr/bin/reaper','-nosplash','-ignoreerrors','-renderproject','/home/m/soothe-bt/dual300.rpp'],
+                      stdout=open('/dev/null','w'),stderr=subprocess.STDOUT)
+host=find_host(proc); print('host',host)
+time.sleep(4)
+fd=mem_open(host)
+SIG=struct.pack('<I',0x472c4400)
+t0=time.time(); total=0; hits={}
+for line in open(f'/proc/{host}/maps').read().splitlines():
+    p=line.split(); lo,hi=(int(x,16) for x in p[0].split('-'))
+    if 'r' not in p[1]: continue
+    t0r=time.time()
+    ok_read=0
+    a=lo
+    while a<hi:
+        n=min(hi-a, 0x400000)
+        try:
+            d=os.pread(fd,n,a)
+        except Exception:
+            a+=n; continue
+        if not d:
+            a+=n; continue
+        ok_read+=len(d)
+        i=0
+        while True:
+            i=d.find(SIG,i)
+            if i<0: break
+            hits[a+i]=None; i+=1
+        a+=n
+    if ok_read:
+        print(' 0x%x-%x MB=%.1f ok=%.1fMB'%(lo,hi,(hi-lo)/1e6,ok_read/1e6))
+    total+=ok_read
+print('scanned ok=%.0fMB t=%.1fs n44100=%d'%(total/1e6,time.time()-t0,len(hits)))
+for a in list(hits)[:5]:
+    print('  HIT 0x%x'%a)
+proc.kill()