play a sample in a buffer

QNX Newsgroups (Archives) qdn.public.ddk.audio
1

Hi,

Do I have to dive into the Audio DDK to do this:

When an audio sample arrive from an ethernet network in a ring buffer (with
io-net). It is send to the sound card to be played…

I’m a student and I already made the network part of my end-of-study project
with the network DDK.
But I’m running out of time…

If somebody could just show me the way or send me some examples, I would be
really, really thankful…

Something else: I tried to download Igor’s ESS driver but the address
doesn’t seems to be this one anymore :
http://members.home.com/kovalenko/software/ess … a server problem?

Thanks a lot to anybody who can help me and sorry for my English…

Arnaud Stoumont

2

When an audio sample arrive from an ethernet network in a ring buffer
(with
io-net). It is send to the sound card to be played…

Are you sure in that you need the Audio DDK ??? DDK - driver development
kit, it is intended for hardware, but not for software.

If you want some help, please concretize you problem more wider …

Maybe you need client part of Audio DDK, so-called ALSA compatible layer ?

3

Well, I know that for the network part of my project which was sending data
without TCP/IP, I had to play with the network DDK even if I didn’t write
any hardware driver…

For the audio part, I would thank god if a simple function exist to do that
:

  1. an ethernet packet arrives in the ethernet card buffer. The Ethernet
    packet contains two 24bits samples: one for the right channel, one for the
    left…

  2. IF IT’S NEEDED, they are placed into a ring buffer . It would be faster
    if I could play with pointers but I don’t know how if it’s possible yet…

3)The samples are sent to the sound card DSP to be played.

I guess it would be something like a thread sleeping between the arrival of
the samples…

I think the best thing to do is reading the audio DDK and stop bothering you
before I know a little bit more how it works…

Thanks a lot,

Arnaud Stoumont

4

So audio-DDK is not like network DDK, you can not do any application with it
(like down produceer, filter…)
Somebody told me about the Audio Developpers guide, I think that’s what I
need!

Thanks,

Arnaud Stoumont