... Though in the only place where these summaries are used, which is
Sequence::GetWaveDisplay, we ignore the correctly reported error code anyway.
Also RAII in management of relevant memory buffers and mutexes.
... also replace explicit mutex locking with RAII and atomics.
This is a part of the big project that handles failure to write block files, as
from disk exhaustion. ODDecodeBlockFile::WriteODDecodeBlockFile is the one
place calling WriteSimpleBlockFile but not (as in SimpleBlockFile constructor)
throwing an exception.
It is called only when attempting to recover files at open time, or in worker
threads in an EXPERIMENTAL code branch.
... whenever they really describe the size of a buffer that fits in memory, or
of a block file (which is never now more than a megabyte and so could be fit in
memory all at once), or a part thereof.
... for functions in final classes.
override is like const -- it's not necessary, but it helps the compiler to
catch mistakes.
There may be some overriding functions not explicitly declared virtual and I did
not identify such cases, in which I might also add override.
... Should have no effect on generated code, except perhaps some slight faster
virtual function calls. Mostly useful as documentation of design intent.
Tried to mark every one of our classes that inherits from another, or is a
base for others, or has abstract virtual functions, and a few others besides.
Also some minor refactoring.
This feature works with mp3 right now - may work on other formats, but that will be a seperate commit.
It is not enabled so most of the changes won't even be compiled, and those that do won't be run.
To enable it uncommment the EXPERIMENTAL_ODFFMPEG def in Experimental.h
