WARNING: Buffer underrun in real-time audio output

From what I can tell your code looks good, but see the harmonic
generating example in the FLOSS manual. Also, try setting ksmps to 1
instead of kr. I'm not sure, but that may be what's causing the
jitters.

BTW, could you translate your comment beside where you set kr to 1 into English?

Thanks!
Adam

On 9/5/12, Dima Bak  wrote:
> Hi! I want to generate some harmonics and I get constantly (I try to render
> it offline and wav file has same jitters):
>
> WARNING: Buffer underrun in real-time audio output
>
>
> Here is the .csd for CsoundQt (Ubuntu 12.04 x64 csound 5.17 Qutecsound
> 0.6.1  Alsa (i try same csd on win7 and the same result))
>
> What is wrong?
> Thanks.
>
> 
> 
> 
> 
>
> sr = 44100
> kr = 1 ;Важно!
> nchnls = 2
> 0dbfs = 1
>
> instr 1
>
> kfreq = p4
> kamp = 0.2
>
> kcount = 16
>
> kfreq_mult_coof invalue "kfreq_mult_coof"
> kdiv_amp_coof invalue "kdiv_amp_coof"
>
>
> aout = 0
>
> add_harmonics:
>
> apart oscil kamp,kfreq,1
> aout = aout + apart
> kcount = kcount - 1
>
> kfreq = kfreq * kfreq_mult_coof
> kamp = kamp / kdiv_amp_coof
>
>
> if (kcount>0) goto add_harmonics
>
>
>     outs aout,aout
> endin
>
>
> 
> 
> f 1 0 1024 10 1
> i 1 0 1 440
> i 1 + 1 550
> i 1 + 12 660
> e
> 
> 
>  Widgets
>  
>  0
>  0
>  283
>  376
>  true
>  
>  
>   231
>   46
>   255
>  
>  
>   kfreq_mult_coof
>   73
>   67
>   20
>   256
>   {80ee8b63-c218-45d4-b6f3-ec62b6cd2474}
>   true
>   0
>   0
>   1.00000000
>   1.10000000
>   1.09296875
>   lin
>   continuous
>   -1.00000000
>   false
>  
>  
>   kdiv_amp_coof
>   241
>   68
>   20
>   256
>   {25e40fbc-473f-405b-a9a4-b516e6a033c3}
>   true
>   0
>   0
>   1.01000000
>   2.00000000
>   1.10281250
>   lin
>   continuous
>   -1.00000000
>   false
>  
>  
>   
>   7
>   14
>   115
>   30
>   {ac4e9fa1-461d-43de-bfa7-106adecdddf4}
>   true
>   0
>   0
>   kfreq_mult_coof
>   left
>   Arial
>   16
>   3
>   
>    0
>    0
>    0
>   
>   
>    192
>    255
>    192
>   
>   border
>   1
>   1
>  
>  
>   
>   164
>   17
>   115
>   26
>   {18bdc664-e424-4b3b-b190-a12cbc7af701}
>   true
>   0
>   0
>   kdiv_amp_coof
>   left
>   Arial
>   16
>   3
>   
>    0
>    0
>    0
>   
>   
>    255
>    192
>    192
>   
>   border
>   1
>   1
>  
>  
>   kfreq_mult_coof
>   54
>   351
>   80
>   25
>   {34f07aea-8305-4a1d-b384-45fcbf697e20}
>   true
>   0
>   0
>   left
>   Arial
>   16
>   
>    0
>    0
>    0
>   
>   
>    192
>    255
>    192
>   
>   1.09296875
>   0.00100000
>   -999999999999.00000000
>   999999999999.00000000
>   border
>   1
>   1
>   false
>   
>  
>  
>   kdiv_amp_coof
>   232
>   334
>   51
>   28
>   {7d97ecaa-8475-4da8-b43b-c00afcfd821f}
>   true
>   0
>   0
>   left
>   Arial
>   16
>   
>    0
>    0
>    0
>   
>   
>    255
>    192
>    192
>   
>   1.10281250
>   0.00100000
>   -999999999999.00000000
>   999999999999.00000000
>   border
>   1
>   1
>   false
>   
>  
> 
> 
> 
> 
> Version: 3
> Render: Real
> Ask: Yes
> Functions: ioObject
> Listing: Window
> WindowBounds: 780 57 98 28
> CurrentView: io
> IOViewEdit: On
> Options:
> 
>
> 
> ioView nobackground {59367, 11822, 65535}
> ioSlider {73, 67} {20, 256} 1.000000 1.100000 1.092969 kfreq_mult_coof
> ioSlider {241, 68} {20, 256} 1.010000 2.000000 1.102812 kdiv_amp_coof
> ioText {7, 14} {115, 30} label 0.000000 0.00100 "" left "Arial" 16 {0, 0,
> 0} {49152, 65280, 49152} nobackground noborder kfreq_mult_coof
> ioText {164, 17} {115, 26} label 0.000000 0.00100 "" left "Arial" 16 {0, 0,
> 0} {65280, 49152, 49152} nobackground noborder kdiv_amp_coof
> ioText {54, 351} {80, 25} scroll 1.092969 0.001000 "kfreq_mult_coof" left
> "Arial" 16 {0, 0, 0} {49152, 65280, 49152} background noborder
> ioText {232, 334} {51, 28} scroll 1.102812 0.001000 "kdiv_amp_coof" left
> "Arial" 16 {0, 0, 0} {65280, 49152, 49152} background noborder
> 
>
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> csound"
>
>

kr of 1 will definitely cause discontinuities (once per second) if any
parameters are changing at k rate.

Though ksmps of 1 will be even more likely to cause buffer underruns.
I would use jack, find a jack setting that is stable, then set ksmps
equal to the jack period size to get best RT efficiency.

On Wed, Sep 5, 2012 at 9:58 AM, Adam Puckett  wrote:
> From what I can tell your code looks good, but see the harmonic
> generating example in the FLOSS manual. Also, try setting ksmps to 1
> instead of kr. I'm not sure, but that may be what's causing the
> jitters.
>
> BTW, could you translate your comment beside where you set kr to 1 into English?
>
> Thanks!
> Adam
>
> On 9/5/12, Dima Bak  wrote:
>> Hi! I want to generate some harmonics and I get constantly (I try to render
>> it offline and wav file has same jitters):
>>
>> WARNING: Buffer underrun in real-time audio output
>>
>>
>> Here is the .csd for CsoundQt (Ubuntu 12.04 x64 csound 5.17 Qutecsound
>> 0.6.1  Alsa (i try same csd on win7 and the same result))
>>
>> What is wrong?
>> Thanks.
>>
>> 
>> 
>> 
>> 
>>
>> sr = 44100
>> kr = 1 ;Важно!
>> nchnls = 2
>> 0dbfs = 1
>>
>> instr 1
>>
>> kfreq = p4
>> kamp = 0.2
>>
>> kcount = 16
>>
>> kfreq_mult_coof invalue "kfreq_mult_coof"
>> kdiv_amp_coof invalue "kdiv_amp_coof"
>>
>>
>> aout = 0
>>
>> add_harmonics:
>>
>> apart oscil kamp,kfreq,1
>> aout = aout + apart
>> kcount = kcount - 1
>>
>> kfreq = kfreq * kfreq_mult_coof
>> kamp = kamp / kdiv_amp_coof
>>
>>
>> if (kcount>0) goto add_harmonics
>>
>>
>>     outs aout,aout
>> endin
>>
>>
>> 
>> 
>> f 1 0 1024 10 1
>> i 1 0 1 440
>> i 1 + 1 550
>> i 1 + 12 660
>> e
>> 
>> 
>>  Widgets
>>  
>>  0
>>  0
>>  283
>>  376
>>  true
>>  
>>  
>>   231
>>   46
>>   255
>>  
>>  
>>   kfreq_mult_coof
>>   73
>>   67
>>   20
>>   256
>>   {80ee8b63-c218-45d4-b6f3-ec62b6cd2474}
>>   true
>>   0
>>   0
>>   1.00000000
>>   1.10000000
>>   1.09296875
>>   lin
>>   continuous
>>   -1.00000000
>>   false
>>  
>>  
>>   kdiv_amp_coof
>>   241
>>   68
>>   20
>>   256
>>   {25e40fbc-473f-405b-a9a4-b516e6a033c3}
>>   true
>>   0
>>   0
>>   1.01000000
>>   2.00000000
>>   1.10281250
>>   lin
>>   continuous
>>   -1.00000000
>>   false
>>  
>>  
>>   
>>   7
>>   14
>>   115
>>   30
>>   {ac4e9fa1-461d-43de-bfa7-106adecdddf4}
>>   true
>>   0
>>   0
>>   kfreq_mult_coof
>>   left
>>   Arial
>>   16
>>   3
>>   
>>    0
>>    0
>>    0
>>   
>>   
>>    192
>>    255
>>    192
>>   
>>   border
>>   1
>>   1
>>  
>>  
>>   
>>   164
>>   17
>>   115
>>   26
>>   {18bdc664-e424-4b3b-b190-a12cbc7af701}
>>   true
>>   0
>>   0
>>   kdiv_amp_coof
>>   left
>>   Arial
>>   16
>>   3
>>   
>>    0
>>    0
>>    0
>>   
>>   
>>    255
>>    192
>>    192
>>   
>>   border
>>   1
>>   1
>>  
>>  
>>   kfreq_mult_coof
>>   54
>>   351
>>   80
>>   25
>>   {34f07aea-8305-4a1d-b384-45fcbf697e20}
>>   true
>>   0
>>   0
>>   left
>>   Arial
>>   16
>>   
>>    0
>>    0
>>    0
>>   
>>   
>>    192
>>    255
>>    192
>>   
>>   1.09296875
>>   0.00100000
>>   -999999999999.00000000
>>   999999999999.00000000
>>   border
>>   1
>>   1
>>   false
>>   
>>  
>>  
>>   kdiv_amp_coof
>>   232
>>   334
>>   51
>>   28
>>   {7d97ecaa-8475-4da8-b43b-c00afcfd821f}
>>   true
>>   0
>>   0
>>   left
>>   Arial
>>   16
>>   
>>    0
>>    0
>>    0
>>   
>>   
>>    255
>>    192
>>    192
>>   
>>   1.10281250
>>   0.00100000
>>   -999999999999.00000000
>>   999999999999.00000000
>>   border
>>   1
>>   1
>>   false
>>   
>>  
>> 
>> 
>> 
>> 
>> Version: 3
>> Render: Real
>> Ask: Yes
>> Functions: ioObject
>> Listing: Window
>> WindowBounds: 780 57 98 28
>> CurrentView: io
>> IOViewEdit: On
>> Options:
>> 
>>
>> 
>> ioView nobackground {59367, 11822, 65535}
>> ioSlider {73, 67} {20, 256} 1.000000 1.100000 1.092969 kfreq_mult_coof
>> ioSlider {241, 68} {20, 256} 1.010000 2.000000 1.102812 kdiv_amp_coof
>> ioText {7, 14} {115, 30} label 0.000000 0.00100 "" left "Arial" 16 {0, 0,
>> 0} {49152, 65280, 49152} nobackground noborder kfreq_mult_coof
>> ioText {164, 17} {115, 26} label 0.000000 0.00100 "" left "Arial" 16 {0, 0,
>> 0} {65280, 49152, 49152} nobackground noborder kdiv_amp_coof
>> ioText {54, 351} {80, 25} scroll 1.092969 0.001000 "kfreq_mult_coof" left
>> "Arial" 16 {0, 0, 0} {49152, 65280, 49152} background noborder
>> ioText {232, 334} {51, 28} scroll 1.102812 0.001000 "kdiv_amp_coof" left
>> "Arial" 16 {0, 0, 0} {65280, 49152, 49152} background noborder
>> 
>>
>> Send bugs reports to the Sourceforge bug tracker
>>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
>> Discussions of bugs and features can be posted here
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
>> csound"
>>
>>
>
>
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>