This allows reordering, duplication, and silencing of input channels.

Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com>
Signed-off-by: Martin Storsjö <martin@martin.st>

It adds unnecessary complication for insignificant usability improvement.
The user really should know if they'll need resampling compensation before
opening the context.

Note that only the documentation has changed. The current functionality will
still work until the next major bump.

Also reorder some other #include when applicable.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

This is more consistent with what the rest of Libav does.

This breaks API.

Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>

This is a new library for audio sample format, channel layout, and sample rate
conversion.