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<p class=MsoNormal><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'>Hi All<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'>I am using
speex in one of my WinCE project.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>I have been trying to use speex to perform denoise on the captured
audio packet and echo cancellation. Following behavior I have observed while using
various options. I would really appreciate if you could help me with the issues
I am facing.<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='color:black;mso-list:l3 level1 lfo3;text-autospace:
none'><font size=2 color=black face="Trebuchet MS"><span style='font-size:
10.0pt;font-family:"Trebuchet MS"'>Denoise: I have written the following
to code to perform denoise.<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal style='margin-left:1.0in;text-autospace:none'><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>//To initialize speex preprocess state and set the denoise option<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in;text-autospace:
none'><font size=2 color=black face="Trebuchet MS"><span style='font-size:10.0pt;
font-family:"Trebuchet MS";color:black'>int nEnable = 1;<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>
SpxPreprocessState = speex_preprocess_state_init(160, 8000); //20ms audio at
8000 bps<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in;text-autospace:
none'><font size=2 color=black face="Trebuchet MS"><span style='font-size:10.0pt;
font-family:"Trebuchet MS";color:black'>speex_preprocess_ctl(SpxPreprocessState,
SPEEX_PREPROCESS_SET_DENOISE, &nEnable);<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in;text-autospace:
none'><font size=2 color=black face="Trebuchet MS"><span style='font-size:10.0pt;
font-family:"Trebuchet MS";color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in;text-autospace:
none'><font size=2 color=black face="Trebuchet MS"><span style='font-size:10.0pt;
font-family:"Trebuchet MS";color:black'>//Run the preprocess on the buffer
captured before encoding<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in;text-autospace:
none'><font size=2 color=black face="Trebuchet MS"><span style='font-size:10.0pt;
font-family:"Trebuchet MS";color:black'>speex_preprocess_run(SpxPreprocessState,
(short*)pbBuffer);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>
speex_encode_int(EncoderState,(short*)pbBuffer, &stSpeexBits); <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>On calling speex_preprocess_run removes all the audio from the
buffer and a constant humming sound is heard. I open the recorded file in Cool
edit pro tool and see that all the spikes are removed and flat wave is there.
What could be the reason for this behavior?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=2 type=1>
<li class=MsoNormal style='color:black;mso-list:l3 level1 lfo3'><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:
"Trebuchet MS"'>Echo cancellation: I have two separte threads, one to
capture live audio and another one to playback the audio recvevied on the
network. Since audio capture and playback are handled asynchronously I
call the function <b><i><span style='font-weight:bold;font-style:italic'>speex_echo_playback</span></i></b>
right after I enqueue a buffer for sound card to play and call the
function <b><i><span style='font-weight:bold;font-style:italic'>speex_echo_capture</span></i></b>
for every packet captured before I call <b><i><span style='font-weight:
bold;font-style:italic'>speex_encode_int</span></i></b> for encoding. As
soon as the audio start I see below warnings on the screen<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal style='text-indent:.5in'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><i><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black;font-style:italic'>Warning: No playback frame available (your
application is buggy and/or got xruns)<o:p></o:p></span></font></i></p>
<p class=MsoNormal style='text-indent:.5in'><i><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black;font-style:italic'>Warning: Auto-filling the buffer (your application
is buggy and/or got xruns)<o:p></o:p></span></font></i></p>
<p class=MsoNormal style='text-indent:.5in'><i><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black;font-style:italic'><o:p> </o:p></span></font></i></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>These warning are displayed few times and then it stops. Then once
in a while again these warnings are printed. What exactly do these warning
means as the audio keeps on playing without any problem?<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>
<o:p></o:p></span></font></p>
<ol style='margin-top:0in' start=3 type=1>
<li class=MsoNormal style='color:black;mso-list:l3 level1 lfo3'><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:
"Trebuchet MS"'>For AGC: <o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal style='margin-left:1.0in;text-autospace:none'><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>//To initialize speex preprocess state and set the AGC option<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in;text-autospace:
none'><font size=2 color=black face="Trebuchet MS"><span style='font-size:10.0pt;
font-family:"Trebuchet MS";color:black'>int nEnable = 1;<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>
SpxPreprocessState = speex_preprocess_state_init(160, 8000); //20ms audio at
8000 bps<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>speex_preprocess_ctl(g_pSpxPreprocessState, SPEEX_PREPROCESS_SET_AGC,
&nEnable);<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=black
face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>On enabling AGC I get the below warning.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><i><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black;font-style:italic'>Warning: Unknown speex_preprocess_ctl request: 2<o:p></o:p></span></font></i></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><i><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black;font-style:italic'><o:p> </o:p></span></font></i></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>Is AGC not supported?<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.5in'><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.5in'><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>Thanks & Regards<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.5in'><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:"Trebuchet MS";
color:black'>Gurinder<o:p></o:p></span></font></p>
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