From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Sat, 24 Feb 2018 17:07:16 +0000 (+0100)
Subject: h263: fix timestamp difference calculcation
X-Git-Url: https://git.nihav.org/?a=commitdiff_plain;h=88e9abd4b69419cfa83093a1e4aee3066b90bcea;p=nihav.git

h263: fix timestamp difference calculcation
---

diff --git a/src/codecs/h263/decoder.rs b/src/codecs/h263/decoder.rs
index 85d9eea..a7768ea 100644
--- a/src/codecs/h263/decoder.rs
+++ b/src/codecs/h263/decoder.rs
@@ -208,7 +208,8 @@ impl H263BaseDecoder {
         }
         let is_b = pinfo.mode == Type::B;
 
-        let tsdiff = pinfo.ts.wrapping_sub(self.last_ts) >> 1;
+        let tsdiff = if pinfo.is_pb() { pinfo.ts.wrapping_sub(self.last_ts) >> 1 }
+                     else { self.last_ts.wrapping_sub(self.next_ts) >> 1 };
         let bsdiff = if pinfo.is_pb() { (pinfo.get_pbinfo().get_trb() as u16) << 7 }
                      else { pinfo.ts.wrapping_sub(self.next_ts) >> 1 };