Re: [Vala] Void*, how to deal with it

[alberto colombo <vala albx79 it>]

I've used get_buffer only for MIDI, so far, so I'm not sure how it'd
work on raw audio ports.

With MIDI ports, you use it like this:

        void *port_buffer = midi_in.get_buffer(nframes);
        NFrames count = Midi.get_event_count(port_buffer); 

        for (NFrames i=0; i<count; ++i)
        {
            Midi.Event e;
            Midi.Event.get(out e, port_buffer, i);
            ...

I guess, for audio, you'd have to cast void* get_buffer to
DefaultAudioSample, something like this (untested!):

DefaultAudioSample* buffer =
(DefaultAudioSample*)master_l.get_buffer(nframes);

Let me know if it works.
alb


On Wed, 2010-06-30 at 14:26 +0100, Harry Van Haaren wrote:
> Hey All,
>
> I've got a function in the JACK.vapi binding, that returns a buffer. Now it
> doesnt "physically"
> return the buffer, but returns a  void*  to the buffer.
>
> I checked the Vala tutorial for any references to void*, and didnt find
> anything...
>
> This is the function (to be called on a Port object):
> public void* get_buffer(NFrames nframes);         // nframes is a uint32..
> not that it matters
>
> And this is what I tried (master_l is of Port type):
> var buffer = master_l.get_buffer(nframes);
>
> And what I want to do with this buffer is the following:
>     for(int i = 0; i < (uint32) nframes; i++)
>     {
>         buffer[i] = array[i];   // have an array of samples, need to write
> them to this void* buffer.
>     }
>
> Any suggestions..? Thanks for reading, -Harry
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