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-rw-r--r--Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst15
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 7ee8ae073b91..7e8ab168571d 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -679,6 +679,21 @@ enum v4l2_mpeg_video_frame_skip_mode -
otherwise the decoder expects a single frame in per buffer.
Applicable to the decoder, all codecs.
+``V4L2_CID_MPEG_VIDEO_DEC_DISPLAY_DELAY_ENABLE (boolean)``
+ If the display delay is enabled then the decoder is forced to return
+ a CAPTURE buffer (decoded frame) after processing a certain number
+ of OUTPUT buffers. The delay can be set through
+ ``V4L2_CID_MPEG_VIDEO_DEC_DISPLAY_DELAY``. This
+ feature can be used for example for generating thumbnails of videos.
+ Applicable to the decoder.
+
+``V4L2_CID_MPEG_VIDEO_DEC_DISPLAY_DELAY (integer)``
+ Display delay value for decoder. The decoder is forced to
+ return a decoded frame after the set 'display delay' number of
+ frames. If this number is low it may result in frames returned out
+ of display order, in addition the hardware may still be using the
+ returned buffer as a reference picture for subsequent frames.
+
``V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE (boolean)``
Enable writing sample aspect ratio in the Video Usability
Information. Applicable to the H264 encoder.