[linux-audio-dev] Re: [linux-audio-user] Re: New LADSPA Hints (Was: [ANNOUNCE] tapiir-0.7.1)

[Mike Rawes]

Think this needs to go to LAD too...

 --- Steve Harris <S.W.Harris at ecs.soton.ac.uk> wrote: 
> I think there was one more too, but I can't think what it was...

I remember one about sidechains or something. I don't know what a sidechain is,
though, I just recall seeing it somewhere :)

> I agree AUDIO_RATE_CONTROL should be renamed.
> 
> There was a suggestion on ardour-dev that a hint to say whether control outs
> were supposed to be informative or a source of control data might help,
> but I'm not sure about it.

Not sure what 'informative' means here... what information do we get if we
ignore the control data on the output? 

> Does someone want to reword these in a more meaningful way? If not I'l do
> it, then you'l be sorry ;).

I'll have a go :)

(The LADSPA_IS_* things will need to be added too)

/* Hint MOMENTARY indicates that that a control should behave like a
   momentary switch, such as a reset or sync control. LADSPA_HINT_MOMENTARY
   may only be used in combination with LADSPA_HINT_TOGGLED. */
#define LADSPA_HINT_MOMENTARY       0x40

/* Hint RANDOMISABLE indicates that it's meaningful to randomise the port
   if the user hits a button. This is useful for the steps of control
   sequencers, reverbs, and just about anything that's complex. A control
   with this hint should not result in anything too suprising happening to 
   the user (eg. sudden +100dB gain would be unpleasant). */
#define LADSPA_HINT_RANDOMISABLE    0x80

/* Plugin Ports: 

   Plugins have `ports' that are inputs or outputs for audio or
   data. Ports can communicate arrays of LADSPA_Data (for audio
   or continuous control inputs/outputs) or single LADSPA_Data values
   (for control input/outputs). This information is encapsulated in the
   LADSPA_PortDescriptor type which is assembled by ORing individual
   properties together.

   Note that a port must be an input or an output port but not both
   and that a port must be one of either control, audio or continuous. */

[...]

/* Property LADSPA_PORT_CONTINUOUS_CONTROL indicates that the port is 
   a control port with data supplied at audio rate. */ 
#define LADSPA_PORT_CONTINUOUS_CONTROL        0x10 

- 
Mike

> 
> - Steve
> 
> > On Wed, 15 Jan 2003 18:13:35 +0000
> > Steve Harris <S.W.Harris at ecs.soton.ac.uk> wrote:
> > 
> > > There have been a few suggestions recently, I'l try to summarise them
> > > for comment.
> > > 
> > > MOMENTARY. A hint to suggest that a control should behave like a
> > > momentary switch, eg. on for as long as the user holds down the
> > > key/mouse button/whatever. Useful for reset or sync controls for
> > > example. Would be useful in the DJ flanger. Only applies to TOGGLED
> > > controls.
> > > 
> > > AUDIO_RATE_CONTROL. Hints than an audio control should/could be
> > > controlled by a high time res. slider or control data, but shouldn't
> > > be connected to the next audio signal by default. I can't think of any
> > > simple examples off hand, but combined with MOMENTARY it could be used
> > > for sample accurate tempo tapping.
> > > 
> > > RANDOMISABLE. Hints that its useful/meaningful to randomise the port
> > > if the user hits a button. This is useful for the steps of control
> > > sequencers, reverbs, and just about anything that's complex. Allows
> > > you to specify which controls can be randomised without anything too
> > > supprising happening to the user (eg. sudden +100dB gain would be
> > > unpleasent). 


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