[Bug 682770] v4l2src breaks after renegotiation

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=682770
  GStreamer | gst-plugins-good | git

--- Comment #1 from Alban Browaeys <prahal at yahoo.com> 2012-08-29 15:47:47 UTC ---
Created an attachment (id=222797)
 View: https://bugzilla.gnome.org/attachment.cgi?id=222797
 Review: https://bugzilla.gnome.org/review?bug=682770&attachment=222797

call stop on the buffer pool to trigger a v4l2_munmap before the new v4l2_mmap

this is rfc .. calling stop fix the device or resource busy ... 
but raised another issue (the stop calls gst_v4l2_buffer_pool_free_buffer on
buffers[i] but buffers[i] can have been made NULL in gst_v4l2_buffer_pool_dqbuf
as to "mark the buffer outstanding" 
thus I made a quick hack ... ie I used a new buffers_hack[] which is never
marked as outstanding which hold the same GstV4l2Meta(s) as buffers[]

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