[alsa-devel] Understanding _snd_pcm_channel_area Struct (PCM Interface)!

[Guilherme]

Hi all.

I am a bit confused on what I get with this function.
I finished my first project but I did not understand what exactly the

_snd_pcm_channel_area at

 http://www.alsa-project.org/alsa-doc/alsa-lib/struct__snd__pcm__channel__area.html

does.

There are 3 fields in the documentation.

addr, first and step.

It seems that addr is the memory address of the channel samples... so 
far so good. The "step" is the distance between 2 sample (but I am not 
sure) and the least, "first", I could not figure out what does it means.

Could I get some help from here?
 
Thanks in advanced!

Tks!

-------------------

Guilherme Longo
Dept. Eng. da Computação
Unaerp

Linux User - #484927

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