[Bug 791211] omxvideodec/enc: update nBufferCountActual before allocating

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791211

--- Comment #3 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 364916
  --> https://bugzilla.gnome.org/attachment.cgi?id=364916&action=edit
omxvideodec/enc: update nBufferCountActual before allocating

The OMX specs states that the nBufferCountActual of a port has to default
to its nBufferCountMin. If we don't change nBufferCountActual we purely rely
on this default. But in some cases, OMX may change nBufferCountMin before we
allocate buffers. Like for example when configuring the input ports with the
actual format, it may decrease the number of minimal buffers required.
This method checks this and update nBufferCountActual if needed so we'll use
less buffers than the worst case in such scenarios.

Don't do this for the decoder output as
gst_omx_video_dec_allocate_output_buffers() already check
nBufferCountMin when computing the number of output buffers.

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