#9930 NORM Not Tri: Scratch cannot record

Zarro Boogs per Child bugtracker at laptop.org
Sun Jan 3 22:40:26 EST 2010

#9930: Scratch cannot record
           Reporter:  sayamindu         |       Owner:  cscott                            
               Type:  defect            |      Status:  new                               
           Priority:  normal            |   Milestone:  Not Triaged                       
          Component:  scratch-activity  |     Version:  1.5 Software Build os64 aka 10.1.0
         Resolution:                    |    Keywords:                                    
        Next_action:  design            |    Verified:  0                                 
Deployment_affected:                    |   Blockedby:                                    
           Blocking:                    |  

Comment(by Quozl):

 Replying to [comment:5 dmoco]:
 > Replying to [comment:4 sayamindu]:
 > > Interestingly, arecord can record at the rate which normal Scratch
 asks from (44100).
 > Possibly because there is less going on so fewer interrupts? Could also
 be that full duplex is enabled in Scratch hence even more interrupts. I
 find arecord/aplay good for checking that audio is functioning but they
 cannot give any indication of possible problems under high IO loads.

 I doubt it has anything to do with interrupts or high I/O loads.  The
 amount of data transfer is trivial.  It might have more to do with

 The codec on XO-1.5 is different to the codec on XO-1.  On XO-1.5 the
 codec supported rates for input are 44100, 48000 and 96000, at 16, 20 or
 24 bits.  When an application requests anything outside that limited phase
 space, ALSA has to either resample or reject.  ALSA says it may reject
 certain parameters, and it is up to the application to determine different
 parameters if the proposed parameters are rejected.

Ticket URL: <http://dev.laptop.org/ticket/9930#comment:6>
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