Mix_QuickLoad_WAV performs buffer traversal assuming we passed it enough
data. This is not necessarily true and protecting against it would
duplicate some of the Mix_QuickLoad_WAV logic here. As this is less
useful than from_raw_buffer() let's drop it for now.
This basically provides an API to access Mix_QuickLoad_WAV and
Mix_QuickLoad_RAW with one caveat – thie API takes ownership of the
buffers, while Mix_QuickLoad_* functions don't. Since Rust-SDL2 wraps
Mix_Chunks in its own structure with its own buffer ownership flag it's
easy to work around that and deallocate the buffer when Chunk is
dropped.
There are few design considerations here:
* Taking ownership of the buffer. I couldn't come up with a way to
get a Chunk based on a buffer while still keeping the code safe and
making sure that as long as Chunk is alive the buffer is also alive
*and* not making the change be terribly involved and disruptive
* What's the best way to take an ownership of a buffer passed as a
parameter? I came up with Box<[T]> as it seems universal enough,
but I expect a more idiomatic Rust way may exist.
I modified the mixer demo to show how the API is used, a beep is
generated when no sound file is passed to the example.
Jakub Stasiak