mgcp: Count the incoming data instead of the modified one

For jitter, transit and packet loss we should count the data
that arrived and not the data we send towards the remote. This
is changing the jitter timings to what they were before the
re-factoring.

For forced timing we might willingly add jumps in the sequence
number but for jitter and packet loss we are more interested
in the data that traveled through the wire/air.
diff --git a/openbsc/tests/mgcp/mgcp_test.ok b/openbsc/tests/mgcp/mgcp_test.ok
index 6ca82af..bb803d4 100644
--- a/openbsc/tests/mgcp/mgcp_test.ok
+++ b/openbsc/tests/mgcp/mgcp_test.ok
@@ -142,58 +142,58 @@
 Stats: Jitter = 15, Transit = 40
 In TS: 34688, dTS: 0, Seq: 12
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 2065, Transit = -32768
+Stats: Jitter = 0, Transit = -32768
 In TS: 34848, dTS: 160, Seq: 13
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1935, Transit = -32768
+Stats: Jitter = 0, Transit = -32768
 In TS: 35008, dTS: 160, Seq: 14
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1814, Transit = -32768
+Stats: Jitter = 0, Transit = -32768
 In TS: 35128, dTS: 120, Seq: 15
 Out TS change: 120, dTS: 120, Seq change: 1, TS Err change: in +1, out +1
-Stats: Jitter = 1704, Transit = -32728
+Stats: Jitter = 2, Transit = -32728
 In TS: 35288, dTS: 160, Seq: 16
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1597, Transit = -32728
+Stats: Jitter = 2, Transit = -32728
 In TS: 35448, dTS: 160, Seq: 17
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1497, Transit = -32728
+Stats: Jitter = 2, Transit = -32728
 In TS: 35768, dTS: 160, Seq: 19
 Out TS change: 320, dTS: 160, Seq change: 2, TS Err change: in +0, out +0
-Stats: Jitter = 1414, Transit = -32888
+Stats: Jitter = 12, Transit = -32888
 In TS: 35928, dTS: 160, Seq: 20
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1325, Transit = -32888
+Stats: Jitter = 11, Transit = -32888
 In TS: 36088, dTS: 160, Seq: 21
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1252, Transit = -33048
+Stats: Jitter = 20, Transit = -33048
 In TS: 36088, dTS: 160, Seq: 21
 Out TS change: 0, dTS: 160, Seq change: 0, TS Err change: in +0, out +0
-Stats: Jitter = 1184, Transit = -32888
+Stats: Jitter = 29, Transit = -32888
 In TS: 36248, dTS: 160, Seq: 22
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1110, Transit = -32888
+Stats: Jitter = 27, Transit = -32888
 In TS: 36408, dTS: 160, Seq: 23
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1041, Transit = -32888
+Stats: Jitter = 25, Transit = -32888
 In TS: 36568, dTS: 160, Seq: 23
 Out TS change: 160, dTS: 160, Seq change: 0, TS Err change: in +1, out +1
-Stats: Jitter = 976, Transit = -32888
+Stats: Jitter = 24, Transit = -32888
 In TS: 36728, dTS: 160, Seq: 24
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 915, Transit = -32888
+Stats: Jitter = 22, Transit = -32888
 In TS: 36888, dTS: 160, Seq: 25
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 857, Transit = -32888
+Stats: Jitter = 21, Transit = -32888
 In TS: 160000, dTS: 0, Seq: 1000
 Out TS change: 12000, dTS: 12000, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 7748, Transit = -144000
+Stats: Jitter = 0, Transit = -144000
 In TS: 160160, dTS: 160, Seq: 1001
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 7264, Transit = -144000
+Stats: Jitter = 0, Transit = -144000
 In TS: 160320, dTS: 160, Seq: 1002
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 6810, Transit = -144000
+Stats: Jitter = 0, Transit = -144000
 Testing packet error detection.
 Output SSRC changed to 11223344
 In TS: 0, dTS: 0, Seq: 0
@@ -422,58 +422,58 @@
 Stats: Jitter = 15, Transit = 40
 In TS: 34688, dTS: 0, Seq: 12
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 2065, Transit = -32768
+Stats: Jitter = 0, Transit = -32768
 In TS: 34848, dTS: 160, Seq: 13
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1935, Transit = -32768
+Stats: Jitter = 0, Transit = -32768
 In TS: 35008, dTS: 160, Seq: 14
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1814, Transit = -32768
+Stats: Jitter = 0, Transit = -32768
 In TS: 35128, dTS: 120, Seq: 15
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +1, out +0
-Stats: Jitter = 1704, Transit = -32728
+Stats: Jitter = 2, Transit = -32728
 In TS: 35288, dTS: 160, Seq: 16
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1597, Transit = -32728
+Stats: Jitter = 2, Transit = -32728
 In TS: 35448, dTS: 160, Seq: 17
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1497, Transit = -32728
+Stats: Jitter = 2, Transit = -32728
 In TS: 35768, dTS: 160, Seq: 19
 Out TS change: 320, dTS: 160, Seq change: 2, TS Err change: in +0, out +0
-Stats: Jitter = 1414, Transit = -32888
+Stats: Jitter = 12, Transit = -32888
 In TS: 35928, dTS: 160, Seq: 20
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1325, Transit = -32888
+Stats: Jitter = 11, Transit = -32888
 In TS: 36088, dTS: 160, Seq: 21
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1252, Transit = -33048
+Stats: Jitter = 20, Transit = -33048
 In TS: 36088, dTS: 160, Seq: 21
 Out TS change: 0, dTS: 160, Seq change: 0, TS Err change: in +0, out +0
-Stats: Jitter = 1184, Transit = -32888
+Stats: Jitter = 29, Transit = -32888
 In TS: 36248, dTS: 160, Seq: 22
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1110, Transit = -32888
+Stats: Jitter = 27, Transit = -32888
 In TS: 36408, dTS: 160, Seq: 23
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 1041, Transit = -32888
+Stats: Jitter = 25, Transit = -32888
 In TS: 36568, dTS: 160, Seq: 23
 Out TS change: 160, dTS: 160, Seq change: 0, TS Err change: in +1, out +1
-Stats: Jitter = 976, Transit = -32888
+Stats: Jitter = 24, Transit = -32888
 In TS: 36728, dTS: 160, Seq: 24
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 915, Transit = -32888
+Stats: Jitter = 22, Transit = -32888
 In TS: 36888, dTS: 160, Seq: 25
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 857, Transit = -32888
+Stats: Jitter = 21, Transit = -32888
 In TS: 160000, dTS: 0, Seq: 1000
 Out TS change: 12000, dTS: 12000, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 7748, Transit = -144000
+Stats: Jitter = 0, Transit = -144000
 In TS: 160160, dTS: 160, Seq: 1001
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 7264, Transit = -144000
+Stats: Jitter = 0, Transit = -144000
 In TS: 160320, dTS: 160, Seq: 1002
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
-Stats: Jitter = 6810, Transit = -144000
+Stats: Jitter = 0, Transit = -144000
 Testing multiple payload types
 Testing no sequence flow on initial packet
 Done