The former is deprecated by C++14. The standard says they are the same:

The header defines all types and macros the same as the C standard library
header<stdint.h>.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Fixes access to uninitialized memory (`remaining_bytes` isn't
initialized until Ready() is called) and fixes spurious
`getfingerprint` failures.

A first use case for our libchromaprint integration added by commit
30e22b75

Let the constructor and destructor do this.  This means that all users
have to be converted to allocate PcmConvert dynamically.