Use mixxx::audio::ChannelCount type instead of int/unsigned char/etc.

[Holzhaus]

No description provided.

[Swiftb0y]

LGTM.
I fear in the future ChannelCount won't be a powerful enough abstraction anymore, for stems we probably need a ChannelLayout that can manage an arbitrary amount of channels and give them meaning (surround sound, stems, etc?).

[Holzhaus]

I fear in the future ChannelCount won't be a powerful enough abstraction anymore, for stems we probably need a ChannelLayout that can manage an arbitrary amount of channels and give them meaning (surround sound, stems, etc?).

We already have:

mixxx/src/audio/types.h

Lines 26 to 31 in 1fce230

	enum class ChannelLayout {
	Mono, // 1 channel
	DualMono, // 2 channels with identical signals
	Stereo, // 2 independent channels left/right
	// ...to be continued...
	};

We could start replacing ChannelCount instances with it (where applicable).

[Swiftb0y]

Ah didn't know about that. Yeah makes sense.