[Gambas-user] Generating a sine wave with ALSA

Ru Vuott vuott at ...325...
Wed Dec 18 00:20:50 CET 2013 

I suppose it's a kind of signal, meaning....

..you can see snd_pcm_writei() gives to ALSA handle a buffer variable full of Float values.

vuott



--------------------------------------------
Mer 18/12/13, Jussi Lahtinen <jussi.lahtinen at ...626...> ha scritto:

 Oggetto: Re: [Gambas-user] Generating a sine wave with ALSA
 A: "mailing list for gambas users" <gambas-user at lists.sourceforge.net>
 Data: Mercoledì 18 dicembre 2013, 00:05
 
 No, as the name suggest it's float,
 not integer.
 
 Jussi
 
 
 On Wed, Dec 18, 2013 at 12:03 AM, Ru Vuott <vuott at ...325...>
 wrote:
 
 > Uhmmmm... it would seem to be correct.
 > In fact, if I insert this line in the code C:
 >
 >    printf("SND_PCM_FORMAT_FLOAT value = 
 %d", SND_PCM_FORMAT_FLOAT);
 >
 > and then I run that compilated C code, I obtain in
 terminal this results:
 >
 >      SND_PCM_FORMAT_FLOAT value = 
 14
 >
 >
 > In addition, you can easily calculate the enumeration
 of that ALSA
 > Constant in this page (see at Enumerations):
 >
 >   http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m.html
 >
 > You can see:  SND_PCM_FORMAT_FLOAT =
 SND_PCM_FORMAT_FLOAT_LE
 >
 >
 > Thank you for your  help.
 >
 > bye
 > vuott
 >
 >
 >
 > --------------------------------------------
 > Mar 17/12/13, Jussi Lahtinen <jussi.lahtinen at ...626...>
 ha scritto:
 >
 >  Oggetto: Re: [Gambas-user] Generating a sine wave
 with ALSA
 >  A: "mailing list for gambas users" <gambas-user at lists.sourceforge.net>
 >  Data: Martedì 17 dicembre 2013, 22:34
 >
 >  At least this isn't right:
 >  Private Const SND_PCM_FORMAT_FLOAT As Integer =
 14
 >
 >  I'll look more closely later.
 >
 >  Jussi
 >
 >
 >  On Tue, Dec 17, 2013 at 11:31 PM, Ru Vuott <vuott at ...325...>
 >  wrote:
 >
 >  > The C code is in Data folder of Gambas
 project.
 >  >
 >  > Anyway, I've attached it to this email.
 >  >
 >  > Bye
 >  > vuotttttttt
 >  >
 >  >
 >  >
 >  >
 --------------------------------------------
 >  > Mar 17/12/13, Jussi Lahtinen <jussi.lahtinen at ...626...>
 >  ha scritto:
 >  >
 >  >  Oggetto: Re: [Gambas-user] Generating
 a sine wave
 >  with ALSA
 >  >  A: "mailing list for gambas users"
 <gambas-user at lists.sourceforge.net>
 >  >  Data: Martedì 17 dicembre 2013,
 22:26
 >  >
 >  >  Where is the C source? Without it I
 >  >  can't say whether you have translated
 >  >  it correctly or not.
 >  >
 >  >  Jussi
 >  >
 >  >
 >  >  On Tue, Dec 17, 2013 at 6:38 PM, Ru
 Vuott <vuott at ...325...>
 >  >  wrote:
 >  >
 >  >  > Hello,
 >  >  >
 >  >  > in my eternal struggle with ALSA
 >  >  :-)   I was trying to
 convert in
 >  gambas
 >  >  > a C code, written to generate a
 sine wave
 >  with ALSA
 >  >  functions.
 >  >  >
 >  >  > When I run the application, I can
 hear the
 >  sound of the
 >  >  wave, but it is
 >  >  > mixed with a background hiss.
 >  >  >
 >  >  > I would like to have your opinion
 and check
 >  if I have
 >  >  made good the
 >  >  > conversion.
 >  >  >
 >  >  > Attached:
 >  >  > - The Gambas source (in the Data
 folder is
 >  the original
 >  >  C code);
 >  >  > - The compiled C program that
 works
 >  perfectly ... As I
 >  >  would like with
 >  >  > Gambas!  :-(
 >  >  >
 >  >  > regards and thanks
 >  >  > vuott
 >  >  >
 >  >  >
 >  >
 >  >
 >
 > 
 ------------------------------------------------------------------------------
 >  >  > Rapidly troubleshoot problems
 before they
 >  affect your
 >  >  business. Most IT
 >  >  > organizations don't have a clear
 picture of
 >  how
 >  >  application performance
 >  >  > affects their revenue. With
 AppDynamics, you
 >  get 100%
 >  >  visibility into your
 >  >  > Java,.NET, & PHP application.
 Start your
 >  15-day
 >  >  FREE TRIAL of AppDynamics
 >  >  > Pro!
 >  >  >
 >  >
 > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
 >  >  >
 >  _______________________________________________
 >  >  > Gambas-user mailing list
 >  >  > Gambas-user at lists.sourceforge.net
 >  >  > https://lists.sourceforge.net/lists/listinfo/gambas-user
 >  >  >
 >  >  >
 >  >
 >  >
 >
 > 
 ------------------------------------------------------------------------------
 >  >  Rapidly troubleshoot problems before
 they affect
 >  your
 >  >  business. Most IT
 >  >  organizations don't have a clear
 picture of how
 >  application
 >  >  performance
 >  >  affects their revenue. With
 AppDynamics, you get
 >  100%
 >  >  visibility into your
 >  >  Java,.NET, & PHP application.
 Start your
 >  15-day FREE
 >  >  TRIAL of AppDynamics Pro!
 >  >
 >  >
 > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
 >  > 
 _______________________________________________
 >  >  Gambas-user mailing list
 >  >  Gambas-user at lists.sourceforge.net
 >  >  https://lists.sourceforge.net/lists/listinfo/gambas-user
 >  >
 >  >
 >  >
 >
 > 
 ------------------------------------------------------------------------------
 >  > Rapidly troubleshoot problems before they
 affect your
 >  business. Most IT
 >  > organizations don't have a clear picture of
 how
 >  application performance
 >  > affects their revenue. With AppDynamics, you
 get 100%
 >  visibility into your
 >  > Java,.NET, & PHP application. Start your
 15-day
 >  FREE TRIAL of AppDynamics
 >  > Pro!
 >  >
 > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
 >  >
 _______________________________________________
 >  > Gambas-user mailing list
 >  > Gambas-user at lists.sourceforge.net
 >  > https://lists.sourceforge.net/lists/listinfo/gambas-user
 >  >
 >  >
 >
 > 
 ------------------------------------------------------------------------------
 >  Rapidly troubleshoot problems before they affect
 your
 >  business. Most IT
 >  organizations don't have a clear picture of how
 application
 >  performance
 >  affects their revenue. With AppDynamics, you get
 100%
 >  visibility into your
 >  Java,.NET, & PHP application. Start your
 15-day FREE
 >  TRIAL of AppDynamics Pro!
 >
 > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
 >  _______________________________________________
 >  Gambas-user mailing list
 >  Gambas-user at lists.sourceforge.net
 >  https://lists.sourceforge.net/lists/listinfo/gambas-user
 >
 >
 >
 >
 ------------------------------------------------------------------------------
 > Rapidly troubleshoot problems before they affect your
 business. Most IT
 > organizations don't have a clear picture of how
 application performance
 > affects their revenue. With AppDynamics, you get 100%
 visibility into your
 > Java,.NET, & PHP application. Start your 15-day
 FREE TRIAL of AppDynamics
 > Pro!
 > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
 > _______________________________________________
 > Gambas-user mailing list
 > Gambas-user at lists.sourceforge.net
 > https://lists.sourceforge.net/lists/listinfo/gambas-user
 >
 ------------------------------------------------------------------------------
 Rapidly troubleshoot problems before they affect your
 business. Most IT 
 organizations don't have a clear picture of how application
 performance 
 affects their revenue. With AppDynamics, you get 100%
 visibility into your 
 Java,.NET, & PHP application. Start your 15-day FREE
 TRIAL of AppDynamics Pro!
 http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
 _______________________________________________
 Gambas-user mailing list
 Gambas-user at lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/gambas-user

More information about the User mailing list