audio problem

ketty Lu

Hi, I have an emergent problem.
we use DM8168EVM, RDK4.0+3101.
The audio capture set as 44100, 2channel.
The usecase is capture audio data and send to playback.
But the voice has delay. I printf the time before and after calling snd_pcm_readi(), I found sometimes the time interval is only 1ms.
so the capture send the data too quikly. I estimate the returne samples, it's equal to the setting.
The time interval should be about 22ms.
what's the problem and how to handle it?
Thanks.

over 10 years ago

0 ketty Lu over 10 years ago

Intellectual 950 points

I test if the time interval is 1 ms, the capture data is repeated?

why it can capture the repeated data?

0 js park over 9 years ago in reply to ketty Lu

Intellectual 360 points

Hi. Ketty Lu.

I encountered the same problems as you.

Did you get the solution for this?

0 Margarita Gashova over 9 years ago in reply to js park

TI__Guru* 80190 points

Hello,

What is the software release that you are using here?
Is it DVRRDK?

I would recommend you to check these values :

 period_size = 2048;
	buf_size = period_size * 4;


	snd_pcm_hw_params_set_buffer_size_near(handle, hw_params, &buf_size);
        snd_pcm_hw_params_set_period_size_near(handle, hw_params, &period_size, 0);



BR
Margarita