[flac-dev] A couple of questions about channel mapping

[lvqcl]

Martin Leese wrote:

> Why place restrictions on which speaker a
> user can use?

> Finally to answer your question, for a
> single-channel file, FLAC should accept any
> one of the three masks 0x00000001 (FL),
> 0x00000002 (FR), 0x00000004 (FC), plus any
> one of the 15 other single-bit masks, plus zero.
>
> Hope this helps to clarify things.

But that's not how FLAC currently works. It accepts only WAV files
with channel maps equivalent to its own default channel assignment.

For example, the default channel assignment for 4-ch audio
is front left, front right, back left, back right.
The command-line encoder accepts 4-channel WAV files with channel
masks 0x33 (FL, FR, BL, BR) and 0x603 (FL, FR, SL, SR). To encode
other files '--channel-map=none' option is required.