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Subject[Patch v3 11/11] Documention: v4l: Documentation for HEVC CIDs
Date
Added V4l2 controls for HEVC encoder

Signed-off-by: Smitha T Murthy <smitha.t@samsung.com>
---
Documentation/media/uapi/v4l/extended-controls.rst | 355 +++++++++++++++++++++
1 file changed, 355 insertions(+)

diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst
index abb1057..c2f3c5e 100644
--- a/Documentation/media/uapi/v4l/extended-controls.rst
+++ b/Documentation/media/uapi/v4l/extended-controls.rst
@@ -1960,6 +1960,361 @@ enum v4l2_vp8_golden_frame_sel -
1, 2 and 3 corresponding to encoder profiles 0, 1, 2 and 3.


+HEVC Control Reference
+---------------------
+
+The HEVC controls include controls for encoding parameters of HEVC video
+codec.
+
+
+.. _hevc-control-id:
+
+HEVC Control IDs
+^^^^^^^^^^^^^^^
+
+``V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP``
+ Minimum quantization parameter for HEVC.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP``
+ Maximum quantization parameter for HEVC.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP``
+ Quantization parameter for an I frame for HEVC.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP``
+ Quantization parameter for a P frame for HEVC.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP``
+ Quantization parameter for a B frame for HEVC.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIERARCHICAL_QP``
+ HIERARCHICAL_QP allows host to specify the quantization parameter values
+ for each temporal layer through HIERARCHICAL_QP_LAYER. This is valid only
+ if HIERARCHICAL_CODING_LAYER is greater than 1.
+
+.. _v4l2-hevc-hierarchical-coding-type:
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIERARCHICAL_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_HIERARCHICAL_CODING_LAYER``
+ 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.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIERARCHICAL_CODING_LAYER_QP``
+ Indicates the hierarchical coding layer quantization parameter.
+ For HEVC it can have a value of 0-51. Hence in the control value passed
+ the LSB 16 bits will indicate the quantization parameter. The MSB 16 bit
+ will pass the layer(0-6) it is meant for.
+
+.. _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_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 -
+ Select 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``
+ Indicates the number of evenly spaced subintervals, called ticks, within
+ one modulo time. One modulo time represents the fixed interval of one
+ second. This is a 16bit unsigned integer and has a maximum value upto
+ 0xffff.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_TIER_FLAG``
+ TIER_FLAG specifies tier 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 very demanding applications
+
+``V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH``
+ Selects HEVC maximum coding unit depth.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_REF_NUMBER_FOR_PFRAMES``
+ Selects number of P reference picture required for HEVC encoder.
+ P-Frame can use 1 or 2 frames for reference.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_LF``
+ Indicates loop filtering. Control ID 0 indicates loop filtering
+ is enabled and when set to 1 indicates no filter.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_LF_SLICE_BOUNDARY``
+ 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.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2``
+ Selects HEVC loop filter beta offset. The valid range is [-6, +6].
+ This could be a negative value in the 2's complement expression.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2``
+ Selects HEVC loop filter tc offset. The valid range is [-6, +6].
+ This could be a negative value in the 2's complement expression.
+
+.. _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
+ 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.
+
+.. raw:: latex
+
+ \end{adjustbox}
+
+
+``V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD``
+ Selects the refresh period for HEVC encoder.
+ This specifies the number of I picture between two CRA/IDR pictures.
+ This is valid only if REFRESH_TYPE is not 0.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU``
+ 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``
+ 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 it to 1 enables this control ID and
+ setting it to 0 disables the control ID.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT``
+ Indicates wavefront parallel processing for HEVC encoder. Setting it to 0
+ disables the control ID and setting it to 1 enables the wavefront parallel
+ processing.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_SIGN_DATA_HIDING``
+ Setting it to 1 indicates sign data hiding for HEVC encoder. Setting it to
+ 0 disables the control ID.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB``
+ Setting the control ID to 1 enables general picture buffers for HEVC
+ encoder.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID``
+ Indicates temporal identifier specified as temporal_id in
+ nal_unit_header_svc_extension() for HEVC encoder which is enabled by
+ setting the control ID to 1.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING``
+ 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``
+ Indicates max number of merge candidate motion vectors.
+ Values are from zero to four.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_ADAPTIVE_RC_DARK``
+ Indicates HEVC dark region adaptive rate control.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_ADAPTIVE_RC_SMOOTH``
+ Indicates HEVC smooth region adaptive rate control.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_ADAPTIVE_RC_STATIC``
+ Indicates HEVC static region adaptive rate control.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_ADAPTIVE_RC_ACTIVITY``
+ Indicates HEVC activity region adaptive rate control.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT``
+ Indicates intra prediction unit split for HEVC Encoder. Setting it to 1
+ disables the feature. Setting it to 1 enables the feature.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION``
+ Indicates temporal motion vector prediction for HEVC encoder. Setting it to
+ 0 enables the prediction. Setting it to 1 disables the prediction.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE``
+ Specifies if HEVC generates a stream with a size of length field instead of
+ start code pattern. The size of the length field is configurable among 1,2
+ or 4 thorugh the SIZE_OF_LENGTH_FIELD. It is not applied at SEQ_START.
+ Setting it to 0 disables the control ID. Setting it to 1 will enables
+ the control ID.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_QP_INDEX_CR``
+ Indicates the quantization parameter CR index.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_QP_INDEX_CB``
+ Indicates the quantization parameter CB index.
+
+.. _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_PREPEND_SPSPPS_TO_IDR``
+ Indicates whether to generate SPS and PPS at every IDR. Setting it to 0
+ disables it and setting it to one enables the feature.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIERARCHICAL_CODING_LAYER_CH``
+ Indicates hierarchical coding layer change for HEVC encoder.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER0_BITRATE``
+ Indicates bit rate for hierarchical coding layer 0 for HEVC encoder.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER1_BITRATE``
+ Indicates bit rate for hierarchical coding layer 1 for HEVC encoder.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER2_BITRATE``
+ Indicates bit rate for hierarchical coding layer 2 for HEVC encoder.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER3_BITRATE``
+ Indicates bit rate for hierarchical coding layer 3 for HEVC encoder.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER4_BITRATE``
+ Indicates bit rate for hierarchical coding layer 4 for HEVC encoder.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER5_BITRATE``
+ Indicates bit rate for hierarchical coding layer 5 for HEVC encoder.
+
+``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER6_BITRATE``
+ Indicates bit rate for hierarchical coding layer 6 for HEVC encoder.
+
+
.. _camera-controls:

Camera Control Reference
--
2.7.4
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