[FFmpeg-cvslog] mpegts: fix Continuity Counter error detection

[Jindrich Makovicka]

ffmpeg | branch: master | Jindrich Makovicka <makovick at gmail.com> | Thu Jun 30 09:03:15 2011 +0000| [8923cfa328e8eb565aebcfe8672b276fd1c19bf7] | committer: Anton Khirnov

mpegts: fix Continuity Counter error detection

According to MPEG-TS specs, the continuity_counter shall not be
incremented when the adaptation_field_control of the packet
equals '00' or '10'.

Signed-off-by: Jindrich Makovicka <jindrich.makovicka at nangu.tv>
Signed-off-by: Anton Khirnov <anton at khirnov.net>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8923cfa328e8eb565aebcfe8672b276fd1c19bf7
---

 libavformat/mpegts.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 43cd1fb..228f48b 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -1248,7 +1248,7 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
 {
     AVFormatContext *s = ts->stream;
     MpegTSFilter *tss;
-    int len, pid, cc, cc_ok, afc, is_start;
+    int len, pid, cc, expected_cc, cc_ok, afc, is_start;
     const uint8_t *p, *p_end;
     int64_t pos;
 
@@ -1266,7 +1266,8 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
 
     /* continuity check (currently not used) */
     cc = (packet[3] & 0xf);
-    cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
+    expected_cc = (packet[3] & 0x10) ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
+    cc_ok = (tss->last_cc < 0) || (expected_cc == cc);
     tss->last_cc = cc;
 
     /* skip adaptation field */