[Bug 696852] New: decklinksrc does not allow the capture of more than 2 channels of embedded audio on SDI input

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=696852
  GStreamer | gst-plugins-bad | unspecified

           Summary: decklinksrc does not allow the capture of more than 2
                    channels of embedded audio on SDI input
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: v at skyrock.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=240115)
 View: https://bugzilla.gnome.org/attachment.cgi?id=240115
 Review: https://bugzilla.gnome.org/review?bug=696852&attachment=240115

Hackish patch against 0.10.22.3 for multichannel audio in on SDI inputs

SDI links can embed up to 16 audio channels, which can be retrieved by the
Decklink cards driver. According to the SDK documentation, you can ask for 2, 8
or 16 channels of audio to be streamed to your client app.

The decklinksrc plugin has a hardcoded value of 2 channels, while it seems to
me that GStreamer can handle multichannel audio pretty well.

Is there any technical reason for this limitation?

Anyway, I've hacked a patch for our own needs that allows us to get the
"missing" channels, and it seems to be working. However, this patch was done
against the Debian version (0.10.22.3) and since I'm not familiar with the
GStreamer source code and coding conventions, it's already outdated and
probably dirty :) I've attached it to this bug so you can review the extent of
my modifications (fairly small).

Do you think a similar patch (against the git version this time) could find its
way in the codebase? There are probably other people who would like to use
multichannel SDI audio in :)

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