tracer: add a first tool to report aggregated findings

A tool to report min/max/avg values per scope and traced value.

tracer/gsttr-stats.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+'''
+How to run:
+Offline:
+GST_DEBUG="GST_TRACER:7" GST_TRACERS="stats;rusage;latency" GST_DEBUG_FILE=trace.log <application>
+python3 gsttr-stats.py trace.log
+'''
+
+from tracer.analyzer import Analyzer
+from tracer.parser import Parser
+
+def format_ts(ts):
+    sec = 1e9
+    h = int(ts // (sec * 60 * 60))
+    m = int((ts // (sec * 60)) % 60)
+    s = (ts / sec)
+    return '{:02d}.{:02d}.{:010.7f}'.format(h,m,s)
+
+if __name__ == '__main__':
+    import argparse
+    parser = argparse.ArgumentParser()
+    parser.add_argument('file', nargs='?', default='debug.log')
+    args = parser.parse_args()
+
+    with Parser(args.file) as log:
+        stats = Analyzer(log)
+        stats.run()
+
+    # iterate scopes
+    for sk,sv in stats.data.items():
+        # iterate tracers
+        for tk,tv in sv.items():
+            mi = tv.get('min', '-')
+            ma = tv.get('max', '-')
+            avg = tv['sum']/tv['num']
+            # TODO: need proper units
+            if tk.endswith('/time') or tk.endswith('-dts') or tk.endswith('-pts'):
+                if mi != '-':
+                    mi = format_ts(mi)
+                if ma != '-':
+                    ma = format_ts(ma)
+                avg = format_ts(avg)
+            print("%-45s: Min/Avg,Max %30s: %s, %s, %s" % (sk, tk, mi, avg, ma))