SoX: Noise reduction muting voice when used with sox_open_mem_read

SoX: Noise reduction muting voice when used with sox_open_mem_read

[v vadiraj via SoX-devel]

Hi,

We are developing a VoIP application where we are trying to apply gain and noise reduction on captured PCM samples.
While we are able to successfully apply gain and observe the volume increase, it is accompanied by noise.
It was possible to create a noise profile file and apply noise reduction on a recorded file, and observed noise reduction.

However, considering this to be a VoIP app, we have accomplished the Gain increase by applying SoX in memory instead of a file (sox_open_mem_read).
When noise reduction is applied along with Gain effect, we see zero voice (absolute silence) as output (code snippet below).
I have tried searching web and forum but to avail. Please let me know if this is the way to accomplish.

"e_noise = sox_create_effect(sox_find_effect("noisered"));
args[0] = filePathProf;
args[1] = "0.3";
if (sox_effect_options(e_noise, 2, args) == SOX_SUCCESS)
{
	PJ_LOG(4, (THIS_FILE, " bqRecorderCallback: sox_effect_options NOISERED SUCCESS"));
}
else
{
	PJ_LOG(4, (THIS_FILE, " bqRecorderCallback: sox_effect_options NOISERED FAILED"));
	sox_quit();
	return;
}

if (sox_add_effect(chain, e_noise, &in->signal, &in->signal) == SOX_SUCCESS)
{
	PJ_LOG(4, (THIS_FILE, " bqRecorderCallback: sox_add_effect NOISERED SUCCESS"));
}
else
{
	PJ_LOG(4, (THIS_FILE, " bqRecorderCallback: sox_add_effect NOISERED FAILED"));
	sox_quit();
	return;
}"
Regards,
Vadiraj.

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