Reading an shmsink stream from an external application

[Hamza Chouh]

Thank you for your answers.

The easiest route is to use the "shmsrc" element in your external
> application, otherwise you will have to write your own shmsrc-like
> client for your application.
> If it's of any help, a while ago I made a minimal python example using
> the shmsrc and shmsink elements that might be of some use:
>
> https://github.com/tmatth/gst-prototypes/tree/master/shm
>
> Best,
> Tristan
>
I think I'll be forced to write my own shmsrc-like (actually, if I found a
way to directly send my audio stream to the application without shm, I
would). Anyway, I'll try to understand your python example which seems
interesting.

Copy shmpipe.[ch] and shmalloc.[ch] into your application and use the
> read API described in shmpipe.h (sp_client_* sp_close, sp_get_fd) to get
> the buffers.


I already started to try use this API. So, if I understood well, I have to :

   1. Open a client connection with the server : ShmPipe * pipe =
   sp_client_open(PATH);
   2. Wait for data to read : select(sp_get_fd(pipe), &rdfs, NULL, NULL,
   NULL);
   3. Then receive the data to read : sp_client_recv(pipe, my_buffer);
   4. And finally finish to read using : sp_client_recv_finish()

Now it seems very clear to me, however I still can't get it work : even if
I send a stream to the specified path (using gst-launch audiotestsrc !
shmsink socket-path=testpath), my little program waits eternally, not
seeing any incoming data.

I think I missed something really simple but I can't get it.

2012/7/5 Olivier Crête <olivier.crete at collabora.com>

> Hi,
>
> On Thu, 2012-07-05 at 08:52 -0700, Takido wrote:
> > Hello,
> >
> > I'm trying to feed an external application which deals sound to a special
> > hardware with shmsink. I read all the doc I could find about shm
> (including
> > the commented part of shmpipe.h) but I still don't understand they way I
> > could get the audio stream in my external application.
> >
> > How can I do that ?
>
> Copy shmpipe.[ch] and shmalloc.[ch] into your application and use the
> read API described in shmpipe.h (sp_client_* sp_close, sp_get_fd) to get
> the buffers.
>
> --
> Olivier Crête
> olivier.crete at collabora.com
>
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>
>
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