Time offset: use trace offset average

[babeltrace.git] / converter / babeltrace.c

diff --git a/converter/babeltrace.c b/converter/babeltrace.c
index 22ec92446c5c32ea337706e1355496a5b1be93c7..f872e6dc30ccea4ca06b9f84cae475f4e0a2bb5b 100644 (file)
--- a/converter/babeltrace.c
+++ b/converter/babeltrace.c
@@ -301,6 +301,10 @@ static void init_trace_collection(struct trace_collection *tc)
 {
        tc->array = g_ptr_array_sized_new(DEFAULT_FILE_ARRAY_SIZE);
        tc->clocks = g_hash_table_new(g_direct_hash, g_direct_equal);
+       tc->single_clock_offset_avg = 0;
+       tc->offset_first = 0;
+       tc->delta_offset_first_sum = 0;
+       tc->offset_nr = 0;
 }
 
 /*
@@ -375,13 +379,18 @@ static void clock_add(gpointer key, gpointer value, gpointer user_data)
                if (!tc_clock) {
                        /*
                         * For now, we only support CTF that has one
-                        * single clock.
+                        * single clock uuid or name (absolute ref).
                         */
                        if (g_hash_table_size(tc_clocks) > 0) {
                                fprintf(stderr, "[error] Only CTF traces with a single clock description are supported by this babeltrace version.\n");
                        }
-                       if (!clock_match->tc->single_clock) {
-                               clock_match->tc->single_clock = value;
+                       if (!clock_match->tc->offset_nr) {
+                               clock_match->tc->offset_first =
+                                       (t_clock->offset_s * 1000000000ULL) + t_clock->offset;
+                               clock_match->tc->delta_offset_first_sum = 0;
+                               clock_match->tc->offset_nr++;
+                               clock_match->tc->single_clock_offset_avg =
+                                       clock_match->tc->offset_first;
                        }
                        g_hash_table_insert(tc_clocks,
                                (gpointer) (unsigned long) v,
@@ -402,10 +411,18 @@ static void clock_add(gpointer key, gpointer value, gpointer user_data)
                                g_quark_to_string(tc_clock->name),
                                diff_ns < 0 ? -diff_ns : diff_ns);
                        if (diff_ns > 10000) {
-                               fprintf(stderr, "[warning] Clock \"%s\" offset differs between traces (delta %" PRIu64 " ns). Choosing one arbitrarily.\n",
+                               fprintf(stderr, "[warning] Clock \"%s\" offset differs between traces (delta %" PRIu64 " ns). Using average.\n",
                                        g_quark_to_string(tc_clock->name),
                                        diff_ns < 0 ? -diff_ns : diff_ns);
                        }
+                       /* Compute average */
+                       clock_match->tc->delta_offset_first_sum +=
+                               (t_clock->offset_s * 1000000000ULL) + t_clock->offset
+                               - clock_match->tc->offset_first;
+                       clock_match->tc->offset_nr++;
+                       clock_match->tc->single_clock_offset_avg =
+                               clock_match->tc->offset_first
+                               + (clock_match->tc->delta_offset_first_sum / clock_match->tc->offset_nr);
                }
        }
 }