Issue #16686: Fixed a lot of bugs in audioop module.
* avgpp() and maxpp() no more crash on empty and 1-samples input fragment. They now work when peak-peak values are greater INT_MAX.
* ratecv() no more crashes on empty input fragment.
* Fixed an integer overflow in ratecv().
* Fixed an integer overflow in add() and bias() for 32-bit samples.
* reverse(), lin2lin() and ratecv() no more lose precision for 32-bit samples.
* max() and rms() no more returns negative result for 32-bit sample -0x80000000.
* minmax() now returns correct max value for 32-bit sample -0x80000000.
* avg(), mul(), tomono() and tostereo() now round negative result down and can return 32-bit sample -0x80000000.
* add() now can return 32-bit sample -0x80000000.
diff --git a/Misc/NEWS b/Misc/NEWS
index dde2126..c91e707 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -202,6 +202,12 @@
Library
-------
+- Issue #16686: Fixed a lot of bugs in audioop module. Fixed crashes in
+ avgpp(), maxpp() and ratecv(). Fixed an integer overflow in add(), bias(),
+ and ratecv(). reverse(), lin2lin() and ratecv() no more lose precision for
+ 32-bit samples. max() and rms() no more returns a negative result and
+ various other functions now work correctly with 32-bit sample -0x80000000.
+
- Issue #17073: Fix some integer overflows in sqlite3 module.
- Issue #6083: Fix multiple segmentation faults occured when PyArg_ParseTuple