On Wed, Dec 5, 2012 at 1:48 PM, Niroj Pokhrel <nirojpokhrel@gmail.com> wrote:

Hi,
I'm trying to work on android audio (pcm_native.c) but got stuck in some parameters like start threshold, stop threshold, silence zone, silence threshold. Can anybody please elaborate on what they are each used for ??

Please always use a subject line. This question probably belongs to android mailing list or linux-sound mailing list.
There is some info in the header about silence_threshold:
http://lxr.free-electrons.com/source/include/sound/pcm.h#L306