[Bug 778273] New: AVFVideoSource must post a latency message after it renegotiates caps

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778273

            Bug ID: 778273
           Summary: AVFVideoSource must post a latency message after it
                    renegotiates caps
    Classification: Platform
           Product: GStreamer
           Version: 1.11.1
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: socialmediamaster9000 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Background:

The AVFVideoSource represents the iphone front- and rear-facing cameras. The
cameras can output at various frame-rates and putting a capsfilter downstream
will trigger the frame-rate selection during caps negotiation. The frame-rate
affects the latency, because for example 30fps leads to a latency of ~33ms.

The bug:

Adding an avfvideosrc to a pipeline in the NULL state works fine because
PLAYING the pipeline will calculate latency after all the caps have been
negotiated.

However, if you add an avfvideosrc to an already running pipeline, it will
renegotiate caps but it will not trigger a latency event after deciding its
frame-rate. If the pipeline already had a latency less than 1/frame-rate frames
will be dropped.

The fix:

Post latency message after caps have been set.

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