Re: [Patch v6 10/12] [media] v4l2: Add v4l2 control IDs for HEVC encoder

From: Smitha T Murthy
Date: Mon Jan 22 2018 - 23:48:38 EST

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In reply to: Hans Verkuil: "Re: [Patch v6 10/12] [media] v4l2: Add v4l2 control IDs for HEVC encoder"
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On Mon, 2018-01-22 at 12:08 +0100, Hans Verkuil wrote:
> On 08/12/17 10:08, Smitha T Murthy wrote:
> > Add v4l2 controls for HEVC encoder
> >
> > Signed-off-by: Smitha T Murthy <smitha.t@xxxxxxxxxxx>
> > Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
> > ---
> > drivers/media/v4l2-core/v4l2-ctrls.c | 118 +++++++++++++++++++++++++++++++++++
> > include/uapi/linux/v4l2-controls.h | 92 ++++++++++++++++++++++++++-
> > 2 files changed, 209 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> > index 4e53a86..3f98318 100644
> > --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> > +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> > @@ -480,6 +480,56 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
> > NULL,
> > };
> >
> > + static const char * const hevc_profile[] = {
> > + "Main",
> > + "Main Still Picture",
> > + NULL,
> > + };
> > + static const char * const hevc_level[] = {
> > + "1",
> > + "2",
> > + "2.1",
> > + "3",
> > + "3.1",
> > + "4",
> > + "4.1",
> > + "5",
> > + "5.1",
> > + "5.2",
> > + "6",
> > + "6.1",
> > + "6.2",
> > + NULL,
> > + };
> > + static const char * const hevc_hierarchial_coding_type[] = {
> > + "B",
> > + "P",
> > + NULL,
> > + };
> > + static const char * const hevc_refresh_type[] = {
> > + "None",
> > + "CRA",
> > + "IDR",
> > + NULL,
> > + };
> > + static const char * const hevc_size_of_length_field[] = {
> > + "0",
> > + "1",
> > + "2",
> > + "4",
> > + NULL,
> > + };
> > + static const char * const hevc_tier_flag[] = {
> > + "Main",
> > + "High",
> > + NULL,
> > + };
> > + static const char * const hevc_loop_filter_mode[] = {
> > + "Disabled",
> > + "Enabled",
> > + "Disabled at slice boundary",
> > + "NULL",
> > + };
> >
> > switch (id) {
> > case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
> > @@ -575,6 +625,20 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
> > return dv_it_content_type;
> > case V4L2_CID_DETECT_MD_MODE:
> > return detect_md_mode;
> > + case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
> > + return hevc_profile;
> > + case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
> > + return hevc_level;
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
> > + return hevc_hierarchial_coding_type;
> > + case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
> > + return hevc_refresh_type;
> > + case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
> > + return hevc_size_of_length_field;
> > + case V4L2_CID_MPEG_VIDEO_HEVC_TIER_FLAG:
> > + return hevc_tier_flag;
> > + case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
> > + return hevc_loop_filter_mode;
> >
> > default:
> > return NULL;
> > @@ -776,6 +840,53 @@ const char *v4l2_ctrl_get_name(u32 id)
> > case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
> > case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
> >
> > + /* HEVC controls */
> > + case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP: return "HEVC I-Frame QP Value";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP: return "HEVC P-Frame QP Value";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP: return "HEVC B-Frame QP Value";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP: return "HEVC Minimum QP Value";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP: return "HEVC Maximum QP Value";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE: return "HEVC Profile";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL: return "HEVC Level";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_TIER_FLAG: return "HEVC Tier Flag";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION: return "HEVC Frame Rate Resolution";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH: return "HEVC Maximum Coding Unit Depth";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE: return "HEVC Refresh Type";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED: return "HEVC Constant Intra Prediction";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU: return "HEVC Lossless Encoding";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT: return "HEVC Wavefront";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE: return "HEVC Loop Filter";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP: return "HEVC QP Values";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE: return "HEVC Hierarchical Coding Type";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER: return "HEVC Hierarchical Coding Layer";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP: return "HEVC Hierarchical Lay 0 QP";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP: return "HEVC Hierarchical Lay 1 QP";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP: return "HEVC Hierarchical Lay 2 QP";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP: return "HEVC Hierarchical Lay 3 QP";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP: return "HEVC Hierarchical Lay 4 QP";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP: return "HEVC Hierarchical Lay 5 QP";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP: return "HEVC Hierarchical Lay 6 QP";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR: return "HEVC Hierarchical Lay 0 Bit Rate";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR: return "HEVC Hierarchical Lay 1 Bit Rate";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR: return "HEVC Hierarchical Lay 2 Bit Rate";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR: return "HEVC Hierarchical Lay 3 Bit Rate";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR: return "HEVC Hierarchical Lay 4 Bit Rate";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR: return "HEVC Hierarchical Lay 5 Bit Rate";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR: return "HEVC Hierarchical Lay 6 Bit Rate";
>
> These strings are too long by one character. Perhaps replace "Bit Rate" by "Bitrate"?
>
Yes I will update it in next patch series.

> > + case V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB: return "HEVC General PB";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID: return "HEVC Temporal ID";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING: return "HEVC Strong Intra Smoothing";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT: return "HEVC Intra PU Split";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION: return "HEVC TMV Prediction";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1: return "HEVC Max Number of Candidate MVs";
>
> Ditto. I suggest Number -> Num
>
Ok I will update

> > + case V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE: return "HEVC ENC Without Startcode";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD: return "HEVC Num of I-Frame b/w 2 IDR";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2: return "HEVC Loop Filter Beta Offset";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2: return "HEVC Loop Filter TC Offset";
> > + case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD: return "HEVC Size of Length Field";
> > + case V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES: return "Reference Frames for a P-Frame";
> > + case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR: return "Prepend SPS and PPS to IDR";
>
> Just to confirm: all these new controls all refer to settings that are part of the
> HEVC standard, right? I.e. none of them are specific to the MFC implementation.
>
> I believe I asked this before for older versions of this series, but it's been
> a while, so I'd better check again.
>
Yes all are part of HEVC standard. Few I had moved earlier believing it
was specific to MFC but Stanimir Varbanov had informed me those controls
were present in Venus encoder too
> > +
> > /* CAMERA controls */
> > /* Keep the order of the 'case's the same as in v4l2-controls.h! */
> > case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
> > @@ -1069,6 +1180,13 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> > case V4L2_CID_TUNE_DEEMPHASIS:
> > case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
> > case V4L2_CID_DETECT_MD_MODE:
> > + case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
> > + case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
> > + case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
> > + case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
> > + case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
> > + case V4L2_CID_MPEG_VIDEO_HEVC_TIER_FLAG:
> > + case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
> > *type = V4L2_CTRL_TYPE_MENU;
> > break;
> > case V4L2_CID_LINK_FREQ:
> > diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> > index 31bfc68..a4b8489 100644
> > --- a/include/uapi/linux/v4l2-controls.h
> > +++ b/include/uapi/linux/v4l2-controls.h
> > @@ -588,6 +588,97 @@ enum v4l2_vp8_golden_frame_sel {
> > #define V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP (V4L2_CID_MPEG_BASE+510)
> > #define V4L2_CID_MPEG_VIDEO_VPX_PROFILE (V4L2_CID_MPEG_BASE+511)
> >
> > +/* CIDs for HEVC encoding. Number gaps are for compatibility */
>
> Not sure what you mean with "Number gaps are for compatibility". There are no gaps
> and since this is a new API, there are also no compatibility issues.
>
I will remove the comment
> > +
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP (V4L2_CID_MPEG_BASE + 512)
>
> Each new codec skips to a new range, so I would suggest to start counting at 600 instead of 512.
>
I will change the start of counting to 600

> > +#define V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP (V4L2_CID_MPEG_BASE + 513)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP (V4L2_CID_MPEG_BASE + 514)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP (V4L2_CID_MPEG_BASE + 515)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP (V4L2_CID_MPEG_BASE + 516)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP (V4L2_CID_MPEG_BASE + 517)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE (V4L2_CID_MPEG_BASE + 518)
> > +enum v4l2_mpeg_video_hevc_hier_coding_type {
> > + V4L2_MPEG_VIDEO_HEVC_HIERARCHICAL_CODING_B = 0,
> > + V4L2_MPEG_VIDEO_HEVC_HIERARCHICAL_CODING_P = 1,
> > +};
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER (V4L2_CID_MPEG_BASE + 519)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP (V4L2_CID_MPEG_BASE + 520)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP (V4L2_CID_MPEG_BASE + 521)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP (V4L2_CID_MPEG_BASE + 522)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP (V4L2_CID_MPEG_BASE + 523)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP (V4L2_CID_MPEG_BASE + 524)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP (V4L2_CID_MPEG_BASE + 525)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP (V4L2_CID_MPEG_BASE + 526)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_PROFILE (V4L2_CID_MPEG_BASE + 527)
> > +enum v4l2_mpeg_video_hevc_profile {
> > + V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN = 0,
> > + V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_STILL_PICTURE = 1,
> > +};
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_LEVEL (V4L2_CID_MPEG_BASE + 528)
> > +enum v4l2_mpeg_video_hevc_level {
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_1 = 0,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_2 = 1,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_2_1 = 2,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_3 = 3,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_3_1 = 4,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_4 = 5,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_4_1 = 6,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_5 = 7,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_5_1 = 8,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_5_2 = 9,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_6 = 10,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_6_1 = 11,
> > + V4L2_MPEG_VIDEO_HEVC_LEVEL_6_2 = 12,
> > +};
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION (V4L2_CID_MPEG_BASE + 529)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_TIER_FLAG (V4L2_CID_MPEG_BASE + 530)
> > +enum v4l2_mpeg_video_hevc_tier_flag {
> > + V4L2_MPEG_VIDEO_HEVC_TIER_MAIN = 0,
> > + V4L2_MPEG_VIDEO_HEVC_TIER_HIGH = 1,
> > +};
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH (V4L2_CID_MPEG_BASE + 531)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE (V4L2_CID_MPEG_BASE + 532)
> > +enum v4l2_cid_mpeg_video_hevc_loop_filter_mode {
> > + V4L2_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE_DISABLED = 0,
> > + V4L2_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE_ENABLED = 1,
> > + V4L2_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY = 2,
> > +};
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2 (V4L2_CID_MPEG_BASE + 533)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2 (V4L2_CID_MPEG_BASE + 534)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE (V4L2_CID_MPEG_BASE + 535)
> > +enum v4l2_cid_mpeg_video_hevc_refresh_type {
> > + V4L2_MPEG_VIDEO_HEVC_REFRESH_NONE = 0,
> > + V4L2_MPEG_VIDEO_HEVC_REFRESH_CRA = 1,
> > + V4L2_MPEG_VIDEO_HEVC_REFRESH_IDR = 2,
> > +};
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD (V4L2_CID_MPEG_BASE + 536)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU (V4L2_CID_MPEG_BASE + 537)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED (V4L2_CID_MPEG_BASE + 538)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT (V4L2_CID_MPEG_BASE + 539)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB (V4L2_CID_MPEG_BASE + 540)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID (V4L2_CID_MPEG_BASE + 541)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING (V4L2_CID_MPEG_BASE + 542)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1 (V4L2_CID_MPEG_BASE + 543)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT (V4L2_CID_MPEG_BASE + 544)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION (V4L2_CID_MPEG_BASE + 545)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE (V4L2_CID_MPEG_BASE + 546)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD (V4L2_CID_MPEG_BASE + 547)
> > +enum v4l2_cid_mpeg_video_hevc_size_of_length_field {
> > + V4L2_MPEG_VIDEO_HEVC_SIZE_0 = 0,
> > + V4L2_MPEG_VIDEO_HEVC_SIZE_1 = 1,
> > + V4L2_MPEG_VIDEO_HEVC_SIZE_2 = 2,
> > + V4L2_MPEG_VIDEO_HEVC_SIZE_4 = 3,
> > +};
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR (V4L2_CID_MPEG_BASE + 548)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR (V4L2_CID_MPEG_BASE + 549)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR (V4L2_CID_MPEG_BASE + 550)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR (V4L2_CID_MPEG_BASE + 551)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR (V4L2_CID_MPEG_BASE + 552)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR (V4L2_CID_MPEG_BASE + 553)
> > +#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR (V4L2_CID_MPEG_BASE + 554)
> > +#define V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES (V4L2_CID_MPEG_BASE + 555)
> > +#define V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR (V4L2_CID_MPEG_BASE + 556)
> > +
> > /* MPEG-class control IDs specific to the CX2341x driver as defined by V4L2 */
> > #define V4L2_CID_MPEG_CX2341X_BASE (V4L2_CTRL_CLASS_MPEG | 0x1000)
> > #define V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE (V4L2_CID_MPEG_CX2341X_BASE+0)
> > @@ -656,7 +747,6 @@ enum v4l2_mpeg_mfc51_video_force_frame_type {
> > #define V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_STATIC (V4L2_CID_MPEG_MFC51_BASE+53)
> > #define V4L2_CID_MPEG_MFC51_VIDEO_H264_NUM_REF_PIC_FOR_P (V4L2_CID_MPEG_MFC51_BASE+54)
> >
> > -
> > /* Camera class control IDs */
> >
> > #define V4L2_CID_CAMERA_CLASS_BASE (V4L2_CTRL_CLASS_CAMERA | 0x900)
> >
>
> Regards,
>
> Hans
>
>
Thank you for the review.
Regards,
Smitha

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In reply to: Hans Verkuil: "Re: [Patch v6 10/12] [media] v4l2: Add v4l2 control IDs for HEVC encoder"
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