[SDL] callback issue

[Chris Dobbs]

Futher update on this:
I tried it on another linux box and guess what ? yep, I get 512 passed in as the length as expected.
Guess this means there is something not right with the other box, anyone got and ideas what it could be. I am running with SDL1.2 in tandem with the SDL_AudioIn project to provide microphone input.
Strange thing is I have looke thru some old logs and it definitley used to behave correctly so unless I have installed something that's upset the sound layer or worse the dsp is shot.

-Chris
  ----- Original Message ----- 
  From: Chris Dobbs 
  To: sdl at lists.libsdl.org 
  Sent: Saturday, April 28, 2007 4:28 PM
  Subject: [SDL] callback issue


  All,
  Can someone verify if the following behaviour is correct (and if so why) regarding audio output.

  I have opened the audio device with following params:
  frequency=8000
  samples=256
  channels=1
  format=AUDIO_S16SYS

  The audio callback routine I have assigned fires ok but the length parameter passed to it is not 512 as I would expect, instead it is 340...!?

  The way I understand this is that I have asked SDL to allow me to feed in 256 16 bit samples (512 bytes) every time the callback fires.

  Is this correct or am I missing something - It is possible that my DSP has developed a problem as I have noticed odd crackles occasionally in the speaker.
  The OS is 2.6.18 custom on a DELL inspiron 6000

  Any help is appreciated as usual.
  -Chris



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