How can i change the gains of the mic and pcm in android

Question

I successfully completed the integration of my own aec into android.

But what i need is i have to set the gains of the mic and pcm of the android because in my aec i am applying agc to the farend and nearend signal and then i procees the output of that agc for echo cancelation.

After that i will apply noise reduction on the output of the aec.

When i integrate my aec into the gstreamer there is a command like

alsamixer

for setting the gain levels.

When i set some gain levels my aec is working fine.

But in android how can i set this to make my aec work well.

Don't you know what your code does? What audio API does it use? — CL., Jul 17 '14 at 12:28
Then use the tinyalsa mixer API to change the mixer controls. What specific problem do you have with that? — CL., Jul 18 '14 at 14:57
actually i need to set some gains for mic and speaker to make my aec work. My aec had its own gain controller in it so i need to set outside gain to make it work well — optimus prime, Jul 19 '14 at 16:20
You already wrote in the question that you want to set the gains. What prevents you from doing that? — CL., Jul 19 '14 at 22:12
Actually, i dont know how to set the gain levels outside of my aec — optimus prime, Jul 21 '14 at 02:58

score 1 · Accepted Answer · edited May 21 '17 at 09:13

1

Use mixer_open to open the control device, find the pointer(s) to your control(s) with the mixer_get_* functions, and use mixer_ctl_set_value to change it.

See tinymix.c for an example.

edited May 21 '17 at 09:13

Gluttton

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answered Jul 21 '14 at 07:31

CL.

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I gone through that file and audiohardware.cpp(HAL). In these files they are calling one fuction mixer_ctl_set_value() for setting the mixer related things. The other thing i noticed is in HAL they are setting volume to 1.0f. which one is useful to me? – optimus prime Jul 21 '14 at 11:04
Tinyalsa's mixer interface does not have floating-point mixer values. – CL. Jul 21 '14 at 11:22

How can i change the gains of the mic and pcm in android

1 Answers1