[PATCH v3 0/4] visl: Adapt output frames for reference comparison

[Detlev Casanova <detlev.casanova@collabora.com>]

When using visl in automated tests, we need to have output frames that
can be compared to reference frames or hash of those to validate that
the whole pipeline is working properly.

Add a "stable_output" module parameter to make sure that a given input
stream always outputs the same frames.
This is done by skipping information like queues status and pointer
values.

This also adds some stable variation in the frames so that different
input give more different output.

Changes since v2:
 - Set parameters permissions to 0444 in visl and vidtv
 - Make stable_output true by default
 - Keep showing frames timestamps and remove vb2 buffer indexes only in
   stable output mode
 - Make codec_variablility non optional (remove parameter, keep
   implementation)
 - Add details on used variability fields
Changes since v1:
 - Fix typo in parameter documentation

Detlev Casanova (4):
  media: visl,vidtv: Set parameters permissions to 0444
  media: visl: Add a stable_output parameter
  doc: visl: Document stable_output parameter
  visl: Add codec specific variability on output frames

 Documentation/admin-guide/media/visl.rst      |   4 +
 .../media/test-drivers/vidtv/vidtv_bridge.c   |  20 +-
 drivers/media/test-drivers/visl/visl-core.c   |  15 +-
 drivers/media/test-drivers/visl/visl-dec.c    | 292 ++++++++++++------
 drivers/media/test-drivers/visl/visl.h        |   1 +
 5 files changed, 221 insertions(+), 111 deletions(-)

-- 
2.41.0