On 12/12/24 16:50, James Almer wrote:
On 12/12/2024 3:47 AM, Anton Khirnov wrote:
Quoting James Almer (2024-11-30 14:41:20)
with no speaker location implied
Also, is it really the case that no speaker location is implied? I'd
think mono (as opposed to just "1 channel") does carry the implication
is is the center channel.
Mono, as i understand it, implies it's a single channel with the
entire audio signal, opposed to simply "1 channel" which can be
anything, even LFE.
Apple has separate values for FC and mono, and Quicktime files with
one stream per audio channel will signal the channel meant for the
center speaker as FC and not mono (something that affected lavf
parsing of such files, and forced us to do some heuristics).
In practice yes, you can simplify it as mapping to FC, and in the
absence of said speaker, just play it on FL. But there are scenarios
where the distinction is needed, and we currently lack a way to
properly signal this.
I agree monophonic implies it is the entire audio signal.
There appears to be still room in the enum AVChannel to add AV_CHAN_MONO
if desired (and also AV_CHAN_MONO_2 if it is desired to avoid
AV_CHANNEL_ORDER_CUSTOM for dual mono).
Regards,
Scott Theisen
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