Hi, Please find my comments inline. On 19 June 2017 at 07:10, Smitha T Murthy <smitha.t@xxxxxxxxxxx> wrote: > Added V4l2 controls for HEVC encoder > > Signed-off-by: Smitha T Murthy <smitha.t@xxxxxxxxxxx> > --- > Documentation/media/uapi/v4l/extended-controls.rst | 364 +++++++++++++++++++++ > 1 file changed, 364 insertions(+) > > diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst > index abb1057..7767c70 100644 > --- a/Documentation/media/uapi/v4l/extended-controls.rst > +++ b/Documentation/media/uapi/v4l/extended-controls.rst > @@ -1960,6 +1960,370 @@ enum v4l2_vp8_golden_frame_sel - > 1, 2 and 3 corresponding to encoder profiles 0, 1, 2 and 3. > > [snip] > + > + > +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER (integer)`` > + Selects the hierarchical coding layer. In normal encoding > + (non-hierarchial coding), it should be zero. Possible values are 0 ~ 6. > + 0 indicates HIERARCHICAL CODING LAYER 0, 1 indicates HIERARCHICAL CODING > + LAYER 1 and so on. I would like the above to be more consistent. If HIER is in the name then HIER in the description should be used as well. Aside from that, I would recommend using full HIERARCHICAL instead of HIER in the name of the control. Why? Because it is HIERARCHICAL in controls already present in V4L2, such as V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP. [snip] > + > +``V4L2_CID_MPEG_VIDEO_HEVC_LF (boolean)`` > + Indicates loop filtering. Control value 1 indicates loop filtering > + is enabled and when set to 0 indicates loop filtering is disabled. > + > +``V4L2_CID_MPEG_VIDEO_HEVC_LF_SLICE_BOUNDARY (boolean)`` > + Selects whether to apply the loop filter across the slice boundary or not. > + If the value is 0, loop filter will not be applied across the slice boundary. > + If the value is 1, loop filter will be applied across the slice boundary. Just a thought. Pretty much the same fucntionality is achieved via the V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE control. It's an enum having three states: enabled, disabled and disabled at slice boundary. Maybe a single control could be introduced? With another legacy define for API compatibility. Also, I don't like that controls are not consistent between H264 and HEVC. I would opt for the enum option. > + > +``V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2 (integer)`` > + Selects HEVC loop filter beta offset. The valid range is [-6, +6]. > + > +``V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2 (integer)`` > + Selects HEVC loop filter tc offset. The valid range is [-6, +6]. > + > +.. _v4l2-hevc-refresh-type: > + > +``V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE`` > + (enum) > + [snip] Best wishes, Kamil
