Assume a PTS of 0 if absent, don't bail on fragmented PES packets not having PTS

Change-Id: I3b31f08428fb7195b98f145ae0675006c8756de1
related-to-bug: 5450187

Author: theandi666

media/libstagefright/mpeg2ts/ATSParser.cpp

@@ -724,8 +724,10 @@ void ATSParser::Stream::onPayloadData(
         const uint8_t *data, size_t size) {
     LOGV("onPayloadData mStreamType=0x%02x", mStreamType);
 
-    CHECK(PTS_DTS_flags == 2 || PTS_DTS_flags == 3);
-    int64_t timeUs = mProgram->convertPTSToTimestamp(PTS);
+    int64_t timeUs = 0ll;  // no presentation timestamp available.
+    if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) {
+        timeUs = mProgram->convertPTSToTimestamp(PTS);
+    }
 
     status_t err = mQueue->appendData(data, size, timeUs);
 

media/libstagefright/mpeg2ts/ESQueue.cpp

@@ -444,6 +444,10 @@ int64_t ElementaryStreamQueue::fetchTimestamp(size_t size) {
         }
     }
 
+    if (timeUs == 0ll) {
+        LOGV("Returning 0 timestamp");
+    }
+
     return timeUs;
 }