[Bug 738687] New: midi: add alsamidisrc, an ALSA MIDI sequencer source

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738687
  GStreamer | gst-plugins-bad | 1.x

           Summary: midi: add alsamidisrc, an ALSA MIDI sequencer source
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: ao2 at ao2.it
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=288752)
 View: https://bugzilla.gnome.org/attachment.cgi?id=288752
 Review: https://bugzilla.gnome.org/review?bug=738687&attachment=288752

add alsamidisrc, an ALSA MIDI sequencer source

Hi,

in the attached patch I am proposing a prototype for an ALSA MIDI sequencer
source.

The implementation is based on a previous experiment of mine with appsrc[1]
which was in turn based on aseqdump[2] and amidicat[3].

The code works, and it could even be good enough for my vocoder[4] use case,
but I feel it'd be nice to have this element upstream and there are still some
issues to deal with before that could happen:

  - I am using a GstBufferList hack to push more buffers in the same "polling
    interval" to the source pad, that is in the create() callback; should
    I use threads and queues?

  - The polling interval I am using with the alsa code is quite arbitrary,
    I set it to be "less than the buffer duration", but maybe a more efficient
    approach can be used.

For now I tried to keep the code as simple as possible, just to show the
functionality, any suggestions for improvements, or even better _patches_ are
more than welcome.

The patch is against the 1.4 branch.

Ciao,
   Antonio

[1] http://git.ao2.it/gst-aseq-appsrc.git/
[2] http://git.alsa-project.org/?p=alsa-utils.git;a=tree;f=seq/aseqdump
[3] http://krellan.com/amidicat/
[4] http://ao2.it/109

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