Fix no sound with FDR-AX100 recorded 4k video

1.Pcm(twos and sowt) parsing support in MPEG4Extractor
2.Pcm data reading from SampleTable support

Bug: 80501047
Test: Play XAVC-S Video and check if the audio is heard

Change-Id: I5edc7f1920c80e23dfdb069259d19e28240799b5
diff --git a/media/extractors/mp4/SampleTable.h b/media/extractors/mp4/SampleTable.h
index e4e974b..dd68860 100644
--- a/media/extractors/mp4/SampleTable.h
+++ b/media/extractors/mp4/SampleTable.h
@@ -69,6 +69,9 @@
             bool *isSyncSample = NULL,
             uint32_t *sampleDuration = NULL);
 
+    // call only after getMetaDataForSample has been called successfully.
+    uint32_t getLastSampleIndexInChunk();
+
     enum {
         kFlagBefore,
         kFlagAfter,