Messages in this thread | | | Date | Mon, 29 Apr 2024 19:38:32 +0200 | Subject | Re: [PATCH v2 1/3] media: v4l2-ctrls: Add average qp control | From | Andrzej Pietrasiewicz <> |
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Hi Ming Qian,
W dniu 25.04.2024 o 08:50, Ming Qian pisze: > Add a control V4L2_CID_MPEG_VIDEO_AVERAGE_QP to report the average qp > value of current encoded frame. the value applies to the last dequeued > capture buffer. > > Signed-off-by: Ming Qian <ming.qian@nxp.com> > --- > v2 > - improve document description according Hans's comments > - drop volatile flag > > Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 5 +++++ > drivers/media/v4l2-core/v4l2-ctrls-defs.c | 5 +++++ > include/uapi/linux/v4l2-controls.h | 2 ++ > 3 files changed, 12 insertions(+) > > diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst > index 2a165ae063fb..7d82ab14b8ba 100644 > --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst > +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst > @@ -1653,6 +1653,11 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type - > Quantization parameter for a P frame for FWHT. Valid range: from 1 > to 31. > > +``V4L2_CID_MPEG_VIDEO_AVERAGE_QP (integer)`` > + This read-only control returns the average QP value of the currently > + encoded frame. The value applies to the last dequeued capture buffer > + (VIDIOC_DQBUF). Applicable to encoders. > +
What is the intended range of the values? And why? Is your intention to make it a hardware-agnostic control or a hardware-specific control?
Regrds,
Andrzej
> .. raw:: latex > > \normalsize > diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c > index 8696eb1cdd61..1ea52011247a 100644 > --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c > +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c > @@ -970,6 +970,7 @@ const char *v4l2_ctrl_get_name(u32 id) > case V4L2_CID_MPEG_VIDEO_LTR_COUNT: return "LTR Count"; > case V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX: return "Frame LTR Index"; > case V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES: return "Use LTR Frames"; > + case V4L2_CID_MPEG_VIDEO_AVERAGE_QP: return "Average QP Value"; > case V4L2_CID_FWHT_I_FRAME_QP: return "FWHT I-Frame QP Value"; > case V4L2_CID_FWHT_P_FRAME_QP: return "FWHT P-Frame QP Value"; > > @@ -1507,6 +1508,10 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, > *max = 0xffffffffffffLL; > *step = 1; > break; > + case V4L2_CID_MPEG_VIDEO_AVERAGE_QP: > + *type = V4L2_CTRL_TYPE_INTEGER; > + *flags |= V4L2_CTRL_FLAG_READ_ONLY; > + break; > case V4L2_CID_PIXEL_RATE: > *type = V4L2_CTRL_TYPE_INTEGER64; > *flags |= V4L2_CTRL_FLAG_READ_ONLY; > diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h > index 99c3f5e99da7..974fd254e573 100644 > --- a/include/uapi/linux/v4l2-controls.h > +++ b/include/uapi/linux/v4l2-controls.h > @@ -898,6 +898,8 @@ enum v4l2_mpeg_video_av1_level { > V4L2_MPEG_VIDEO_AV1_LEVEL_7_3 = 23 > }; > > +#define V4L2_CID_MPEG_VIDEO_AVERAGE_QP (V4L2_CID_CODEC_BASE + 657) > + > /* MPEG-class control IDs specific to the CX2341x driver as defined by V4L2 */ > #define V4L2_CID_CODEC_CX2341X_BASE (V4L2_CTRL_CLASS_CODEC | 0x1000) > #define V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE (V4L2_CID_CODEC_CX2341X_BASE+0)
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