qlog_size: decimate rlog option (commaai#33011)

* decimate option

* clean up

* check exists

selfdrive/debug/internal/qlog_size.py

@@ -5,6 +5,7 @@
 
 import matplotlib.pyplot as plt
 
+from cereal.services import SERVICE_LIST
 from openpilot.tools.lib.logreader import LogReader
 from tqdm import tqdm
 
@@ -48,9 +49,29 @@ def make_pie(msgs, typ):
 if __name__ == "__main__":
   parser = argparse.ArgumentParser(description='View log size breakdown by message type')
   parser.add_argument('route', help='route to use')
+  parser.add_argument('--as-qlog', action='store_true', help='decimate rlog using latest decimation factors')
   args = parser.parse_args()
 
   msgs = list(LogReader(args.route))
 
+  if args.as_qlog:
+    new_msgs = []
+    msg_cnts: dict[str, int] = defaultdict(int)
+    for msg in msgs:
+      msg_which = msg.which()
+      if msg.which() in ("initData", "sentinel"):
+        new_msgs.append(msg)
+        continue
+
+      if msg_which not in SERVICE_LIST:
+        continue
+
+      decimation = SERVICE_LIST[msg_which].decimation
+      if decimation is not None and msg_cnts[msg_which] % decimation == 0:
+        new_msgs.append(msg)
+      msg_cnts[msg_which] += 1
+
+    msgs = new_msgs
+
   make_pie(msgs, 'qlog')
   plt.show()