aaudio:  validate audio data format

Also lots of minor cleanup
Fix underscores in some headers
Refactor getTimestamp()

Bug: 34127069
Bug: 38227780
Test: CTS test_aaudio.cpp
Change-Id: I6fdb50eb00a41688df871018ced91d5f5f055f8a
Signed-off-by: Phil Burk <philburk@google.com>
diff --git a/media/libaaudio/src/utility/FixedBlockAdapter.cpp b/media/libaaudio/src/utility/FixedBlockAdapter.cpp
index f4666af..63495f0 100644
--- a/media/libaaudio/src/utility/FixedBlockAdapter.cpp
+++ b/media/libaaudio/src/utility/FixedBlockAdapter.cpp
@@ -25,7 +25,7 @@
 int32_t FixedBlockAdapter::open(int32_t bytesPerFixedBlock)
 {
     mSize = bytesPerFixedBlock;
-    mStorage = new uint8_t[bytesPerFixedBlock]; // TODO use std::nothrow
+    mStorage = new uint8_t[bytesPerFixedBlock];
     mPosition = 0;
     return 0;
 }