Re: dual mono

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Ran Shalit wrote:
> On Sun, Jul 5, 2015 at 9:06 PM, Clemens Ladisch wrote:
>> Ran Shalit wrote:
>>> I would like to ask if dual mono, is used in ALSA APIs, or wether it is the
>>> same as stereo.
>>
>> What exactly do you mean?
>
> I actually need to do the following:
> <analog audio from 2 channels> --> <encode using ALSA into PCM format> --> <encode to AAC>
> I know that there is a concept of "dual mono" and concept of stereo when coding the audio format.
> But I probably went wrong, and this is NOT related to ALSA encode, but to the AAC encoding.

"Dual mono" is indeed an AAC-related concept.

When you record multiple channels using ALSA, they are always independent,
i.e., ALSA does not make any assumptions about the sample values in the
channels (or, for that matter, about consecutive samples in the same
channel).  In other words, you need not (and cannot) tell ALSA whether the
channels are related in any way.


Regards,
Clemens

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