target/linux/bcm27xx/patches-5.4/950-0496-media-videodev2.h-add-V4L2_DEC_CMD_FLUSH.patch

   1 From b2ea711d2c21ec021de4ff09a0a2b5b4224f9749 Mon Sep 17 00:00:00 2001
   2 From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
   3 Date: Fri, 11 Oct 2019 06:32:42 -0300
   4 Subject: [PATCH] media: videodev2.h: add V4L2_DEC_CMD_FLUSH
   5
   6 Add this new V4L2_DEC_CMD_FLUSH decoder command and document it.
   7
   8 Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
   9 Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
  10 Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
  11 Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
  12 Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
  13 ---
  14  Documentation/media/uapi/v4l/vidioc-decoder-cmd.rst | 10 +++++++++-
  15  Documentation/media/videodev2.h.rst.exceptions      |  1 +
  16  include/uapi/linux/videodev2.h                      |  1 +
  17  3 files changed, 11 insertions(+), 1 deletion(-)
  18
  19 --- a/Documentation/media/uapi/v4l/vidioc-decoder-cmd.rst
  20 +++ b/Documentation/media/uapi/v4l/vidioc-decoder-cmd.rst
  21 @@ -208,7 +208,15 @@ introduced in Linux 3.3. They are, howev
  22         been started yet, the driver will return an ``EPERM`` error code. When
  23         the decoder is already running, this command does nothing. No
  24         flags are defined for this command.
  25 -
  26 +    * - ``V4L2_DEC_CMD_FLUSH``
  27 +      - 4
  28 +      - Flush any held capture buffers. Only valid for stateless decoders.
  29 +       This command is typically used when the application reached the
  30 +       end of the stream and the last output buffer had the
  31 +       ``V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF`` flag set. This would prevent
  32 +       dequeueing the capture buffer containing the last decoded frame.
  33 +       So this command can be used to explicitly flush that final decoded
  34 +       frame. This command does nothing if there are no held capture buffers.
  35
  36  Return Value
  37  ============
  38 --- a/Documentation/media/videodev2.h.rst.exceptions
  39 +++ b/Documentation/media/videodev2.h.rst.exceptions
  40 @@ -434,6 +434,7 @@ replace define V4L2_DEC_CMD_START decode
  41  replace define V4L2_DEC_CMD_STOP decoder-cmds
  42  replace define V4L2_DEC_CMD_PAUSE decoder-cmds
  43  replace define V4L2_DEC_CMD_RESUME decoder-cmds
  44 +replace define V4L2_DEC_CMD_FLUSH decoder-cmds
  45
  46  replace define V4L2_DEC_CMD_START_MUTE_AUDIO decoder-cmds
  47  replace define V4L2_DEC_CMD_PAUSE_TO_BLACK decoder-cmds
  48 --- a/include/uapi/linux/videodev2.h
  49 +++ b/include/uapi/linux/videodev2.h
  50 @@ -1989,6 +1989,7 @@ struct v4l2_encoder_cmd {
  51  #define V4L2_DEC_CMD_STOP        (1)
  52  #define V4L2_DEC_CMD_PAUSE       (2)
  53  #define V4L2_DEC_CMD_RESUME      (3)
  54 +#define V4L2_DEC_CMD_FLUSH       (4)
  55
  56  /* Flags for V4L2_DEC_CMD_START */
  57  #define V4L2_DEC_CMD_START_MUTE_AUDIO  (1 << 0)