Re: [Patch v6 12/12] Documention: v4l: Documentation for HEVC CIDs

Hans Verkuil
2018-01-22T12:15:48Z

On 08/12/17 10:08, Smitha T Murthy wrote:
> Added V4l2 controls for HEVC encoder
>
> Signed-off-by: Smitha T Murthy <smitha.t@samsung.com>
> ---
> Documentation/media/uapi/v4l/extended-controls.rst | 395 +++++++++++++++++++++
> 1 file changed, 395 insertions(+)
>
> diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst
> index a3e81c1..3c92763 100644
> --- a/Documentation/media/uapi/v4l/extended-controls.rst
> +++ b/Documentation/media/uapi/v4l/extended-controls.rst
> @@ -1960,6 +1960,401 @@ enum v4l2_vp8_golden_frame_sel -
> 1, 2 and 3 corresponding to encoder profiles 0, 1, 2 and 3.
>
>
> +High Efficiency Video Coding (HEVC/H.265) Control Reference
> +-----------------------------------------------------------
> +
> +The HEVC/H.265 controls include controls for encoding parameters of HEVC/H.265
> +video codec.
> +
> +
> +.. _hevc-control-id:
> +
> +HEVC/H.265 Control IDs
> +^^^^^^^^^^^^^^^^^^^^^^
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP (integer)``
> + Minimum quantization parameter for HEVC.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP (integer)``
> + Maximum quantization parameter for HEVC.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP (integer)``
> + Quantization parameter for an I frame for HEVC.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP (integer)``
> + Quantization parameter for a P frame for HEVC.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP (integer)``
> + Quantization parameter for a B frame for HEVC.

I assume these values all have to be in the range MIN_QP to MAX_QP?
If so, then this should be documented I think.

> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP (boolean)``
> + HIERARCHICAL_QP allows host to specify the quantization parameter values

host -> the host

> + for each temporal layer through HIERARCHICAL_QP_LAYER. This is valid only
> + if HIERARCHICAL_CODING_LAYER is greater than 1. Setting the control value
> + to 1 enables setting of the QP values for the layers.
> +
> +.. _v4l2-hevc-hier-coding-type:
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE``
> + (enum)
> +
> +enum v4l2_mpeg_video_hevc_hier_coding_type -
> + Selects the hierarchical coding type for encoding. Possible values are:
> +
> +.. raw:: latex
> +
> + \begin{adjustbox}{width=\columnwidth}
> +
> +.. tabularcolumns:: |p{11.0cm}|p{10.0cm}|
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + * - ``V4L2_MPEG_VIDEO_HEVC_HIERARCHICAL_CODING_B``
> + - Use the B frame for hierarchical coding.
> + * - ``V4L2_MPEG_VIDEO_HEVC_HIERARCHICAL_CODING_P``
> + - Use the P frame for hierarchical coding.
> +
> +.. raw:: latex
> +
> + \end{adjustbox}
> +
> +
> +``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.

Use - instead of ~. Or just say: [0, 6]

> + 0 indicates HIERARCHICAL CODING LAYER 0, 1 indicates HIERARCHICAL CODING
> + LAYER 1 and so on.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP (integer)``
> + Indicates quantization parameter for hierarchical coding layer 0.
> + For HEVC it can have a value of 0-51.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP (integer)``
> + Indicates quantization parameter for hierarchical coding layer 1.
> + For HEVC it can have a value of 0-51.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP (integer)``
> + Indicates quantization parameter for hierarchical coding layer 2.
> + For HEVC it can have a value of 0-51.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP (integer)``
> + Indicates quantization parameter for hierarchical coding layer 3.
> + For HEVC it can have a value of 0-51.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP (integer)``
> + Indicates quantization parameter for hierarchical coding layer 4.
> + For HEVC it can have a value of 0-51.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP (integer)``
> + Indicates quantization parameter for hierarchical coding layer 5.
> + For HEVC it can have a value of 0-51.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP (integer)``
> + Indicates quantization parameter for hierarchical coding layer 6.
> + For HEVC it can have a value of 0-51.

How do these controls relate to MIN_QP and MAX_QP?

> +
> +.. _v4l2-hevc-profile:
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_PROFILE``
> + (enum)
> +
> +enum v4l2_mpeg_video_hevc_profile -
> + Select the desired profile for HEVC encoder.
> +
> +.. raw:: latex
> +
> + \begin{adjustbox}{width=\columnwidth}
> +
> +.. tabularcolumns:: |p{11.0cm}|p{10.0cm}|
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + * - ``V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN``
> + - Main profile.
> + * - ``V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN10``
> + - Main 10 profile.
> + * - ``V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_STILL_PICTURE``
> + - Main still picture profile.
> +
> +.. raw:: latex
> +
> + \end{adjustbox}
> +
> +
> +.. _v4l2-hevc-level:
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_LEVEL``
> + (enum)
> +
> +enum v4l2_mpeg_video_hevc_level -
> + Selects the desired level for HEVC encoder.
> +
> +.. raw:: latex
> +
> + \begin{adjustbox}{width=\columnwidth}
> +
> +.. tabularcolumns:: |p{11.0cm}|p{10.0cm}|
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_1``
> + - Level 1.0
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_2``
> + - Level 2.0
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_2_1``
> + - Level 2.1
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_3``
> + - Level 3.0
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_3_1``
> + - Level 3.1
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_4``
> + - Level 4.0
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_4_1``
> + - Level 4.1
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_5``
> + - Level 5.0
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_5_1``
> + - Level 5.1
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_5_2``
> + - Level 5.2
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_6``
> + - Level 6.0
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_6_1``
> + - Level 6.1
> + * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_6_2``
> + - Level 6.2
> +
> +.. raw:: latex
> +
> + \end{adjustbox}
> +
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION (integer)``
> + Indicates the number of evenly spaced subintervals, called ticks, within
> + one second. This is a 16 bit unsigned integer and has a maximum value up to
> + 0xffff and a minimum value of 1.
> +
> +.. _v4l2-hevc-tier-flag:
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_TIER_FLAG``
> + (enum)
> +
> +enum v4l2_mpeg_video_hevc_tier_flag -
> + TIER_FLAG specifies tiers information of the HEVC encoded picture. Tier
> + were made to deal with applications that differ in terms of maximum bit
> + rate. Setting the flag to 0 selects HEVC tier_flag as Main tier and setting
> + this flag to 1 indicates High tier. High tier is for applications requiring
> + high bit rates.

Should this perhaps be a bool instead of an enum? Assuming this represents a
single bit. I'm not saying enum is wrong, I just wondered what makes the most
sense.

> +
> +.. raw:: latex
> +
> + \begin{adjustbox}{width=\columnwidth}
> +
> +.. tabularcolumns:: |p{11.0cm}|p{10.0cm}|
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + * - ``V4L2_MPEG_VIDEO_HEVC_TIER_MAIN``
> + - Main tier.
> + * - ``V4L2_MPEG_VIDEO_HEVC_TIER_HIGH``
> + - High tier.
> +
> +.. raw:: latex
> +
> + \end{adjustbox}
> +
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH (integer)``
> + Selects HEVC maximum coding unit depth.
> +
> +.. _v4l2-hevc-loop-filter-mode:
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE``
> + (enum)
> +
> +enum v4l2_mpeg_video_hevc_loop_filter_mode -
> + Loop filter mode for HEVC encoder. Possible values are:
> +
> +.. raw:: latex
> +
> + \begin{adjustbox}{width=\columnwidth}
> +
> +.. tabularcolumns:: |p{11.0cm}|p{10.0cm}|
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + * - ``V4L2_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE_DISABLED``
> + - Loop filter is disabled.
> + * - ``V4L2_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE_ENABLED``
> + - Loop filter is enabled.
> + * - ``V4L2_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY``
> + - Loop filter is disabled at the slice boundary.
> +
> +.. raw:: latex
> +
> + \end{adjustbox}
> +
> +
> +``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)
> +
> +enum v4l2_mpeg_video_hevc_hier_refresh_type -
> + Selects refresh type for HEVC encoder.
> + Host has to specify the period into
> + V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD.
> +
> +.. raw:: latex
> +
> + \begin{adjustbox}{width=\columnwidth}
> +
> +.. tabularcolumns:: |p{11.0cm}|p{10.0cm}|
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + * - ``V4L2_MPEG_VIDEO_HEVC_REFRESH_NONE``
> + - Use the B frame for hierarchical coding.
> + * - ``V4L2_MPEG_VIDEO_HEVC_REFRESH_CRA``
> + - Use CRA (Clean Random Access Unit) picture encoding.
> + * - ``V4L2_MPEG_VIDEO_HEVC_REFRESH_IDR``
> + - Use IDR picture encoding.

Can you add the full name for IDR in brackets, just as you did for CRA?

> +
> +.. raw:: latex
> +
> + \end{adjustbox}
> +
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD (integer)``
> + Selects the refresh period for HEVC encoder.
> + This specifies the number of I pictures between two CRA/IDR pictures.
> + This is valid only if REFRESH_TYPE is not 0.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU (boolean)``
> + Indicates HEVC lossless encoding. Setting it to 0 disables lossless
> + encoding. Setting it to 1 enables lossless encoding.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED (boolean)``
> + Indicates constant intra prediction for HEVC encoder. Specifies the
> + constrained intra prediction in which intra largest coding unit (LCU)
> + prediction is performed by using residual data and decoded samples of
> + neighboring intra LCU only. Setting the value to 1 enables constant intra
> + prediction and setting the value to 0 disables constant inta prediction.

inta -> intra

> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT (boolean)``
> + Indicates wavefront parallel processing for HEVC encoder. Setting it to 0
> + disables the feature and setting it to 1 enables the wavefront parallel
> + processing.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB (boolean)``
> + Setting the value to 1 enables combination of P and B frame for HEVC
> + encoder.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID (boolean)``
> + Indicates temporal identifier for HEVC encoder which is enabled by
> + setting the value to 1.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING (boolean)``
> + Indicates bi-linear interpolation is conditionally used in the intra
> + prediction filtering process in the CVS when set to 1. Indicates bi-linear
> + interpolation is not used in the CVS when set to 0.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1 (integer)``
> + Indicates maximum number of merge candidate motion vectors.
> + Values are from zero to four.

Use number 0 and 4 instead of text.

> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION (boolean)``
> + Indicates temporal motion vector prediction for HEVC encoder. Setting it to
> + 1 enables the prediction. Setting it to 0 disables the prediction.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE (boolean)``
> + Specifies if HEVC generates a stream with a size of the length field
> + instead of start code pattern. The size of the length field is configurable
> + through the V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD control. Setting
> + the value to 0 disables encoding without startcode pattern. Setting the
> + value to 1 will enables encoding without startcode pattern.
> +
> +.. _v4l2-hevc-size-of-length-field:
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD``
> +(enum)
> +
> +enum v4l2_mpeg_video_hevc_size_of_length_field -
> + Indicates the size of length field.
> + This is valid when encoding WITHOUT_STARTCODE_ENABLE is enabled.
> +
> +.. raw:: latex
> +
> + \begin{adjustbox}{width=\columnwidth}
> +
> +.. tabularcolumns:: |p{11.0cm}|p{10.0cm}|
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + * - ``V4L2_MPEG_VIDEO_HEVC_SIZE_0``
> + - Generate start code pattern (Normal).
> + * - ``V4L2_MPEG_VIDEO_HEVC_SIZE_1``
> + - Generate size of length field instead of start code pattern and length is 1.
> + * - ``V4L2_MPEG_VIDEO_HEVC_SIZE_2``
> + - Generate size of length field instead of start code pattern and length is 2.
> + * - ``V4L2_MPEG_VIDEO_HEVC_SIZE_4``
> + - Generate size of length field instead of start code pattern and length is 4.
> +
> +.. raw:: latex
> +
> + \end{adjustbox}
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR (integer)``
> + Indicates bit rate for hierarchical coding layer 0 for HEVC encoder.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR (integer)``
> + Indicates bit rate for hierarchical coding layer 1 for HEVC encoder.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR (integer)``
> + Indicates bit rate for hierarchical coding layer 2 for HEVC encoder.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR (integer)``
> + Indicates bit rate for hierarchical coding layer 3 for HEVC encoder.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR (integer)``
> + Indicates bit rate for hierarchical coding layer 4 for HEVC encoder.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR (integer)``
> + Indicates bit rate for hierarchical coding layer 5 for HEVC encoder.
> +
> +``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR (integer)``
> + Indicates bit rate for hierarchical coding layer 6 for HEVC encoder.
> +
> +``V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES (integer)``
> + Selects number of P reference pictures required for HEVC encoder.
> + P-Frame can use 1 or 2 frames for reference.
> +
> +``V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR (integer)``
> + Indicates whether to generate SPS and PPS at every IDR. Setting it to 0
> + disables generating SPS and PPS at every IDR. Setting it to one enables
> + generating SPS and PPS at every IDR.
> +
> +
> .. _camera-controls:
>
> Camera Control Reference
>

Regards,

Hans