lock on pids only if video startcode is in a pes header

diff --git a/lib/dvb/dvb.cpp b/lib/dvb/dvb.cpp
index 7b05feb4e0f1b4599e1bb4681ce7a321f1cec3d7..8afa70db1ecd7d2948ccdc7dc295f76aa41c2a9b 100644 (file)
--- a/lib/dvb/dvb.cpp
+++ b/lib/dvb/dvb.cpp
@@ -1031,10 +1031,20 @@ int eDVBChannelFilePush::filterRecordData(const unsigned char *_data, int len, s
                        }
                } else if ((d[3] & 0xF0) == 0xE0) /* video stream */
                {
-                       if (m_pid != pid)
+                               /* verify that this is actually a PES header, not just some ES data */
+                       if (ts[1] & 0x40) /* PUSI set */
                        {
-                               eDebug("now locked to pid %04x", pid);
-                               m_pid = pid;
+                               int payload_start = 4;
+                               if (ts[3] & 0x20) /* adaptation field present */
+                                       payload_start += ts[4] + 1; /* skip AF */
+                               if (payload_start == (offset%184)) /* the 00 00 01 should be directly at the payload start, otherwise it's not a PES header */
+                               {
+                                       if (m_pid != pid)
+                                       {
+                                               eDebug("now locked to pid %04x (%02x %02x %02x %02x)", pid, ts[0], ts[1], ts[2], ts[3]);
+                                               m_pid = pid;
+                                       }
+                               }
                        }
 //                     m_pid = 0x6e;
                        d += 4;