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One video encoder IP may support the following two ROI configurations or one of them: 1. configure ROI as a rectangular region, and set a delta QP parameter. 2. configure ROI as a rectangular region, and set a priority parameter. 3. configure ROI as a QP map as an array. Each value represents the delta QP of a block in raster scan order. The block size is determined by the specific IP. 4. configure ROI as a QP map as an array. Each value represents the absolute QP of a block in raster scan order. The block size is determined by the specific IP. To achieve this, I made the following change: 1. I reuse the type V4L2_CTRL_TYPE_RECT that is defined in the UVC ROI patchset 2. Define a ctrl V4L2_CID_MPEG_VIDEO_ROI_MODE to choose ROI configuration 3. Define some ctrl to configure ROI 4. Define a ctrl V4L2_CID_MPEG_VIDEO_ROI_BLOCK_SIZE to query block size I referred the patchset "Implement UVC v1.5 ROI" (https://lwn.net/Articles/953532/) and pick some patches from it. changelog: v4 - Improve description in documentation as Hans's comments v3 - Drop the type V4L2_CTRL_TYPE_REGION - Split the compound control into 2 ctrls - Define 4 ROI mode v2 - export symbol of v4l2_ctrl_type_op_minimum - export symbol of v4l2_ctrl_type_op_maximum Hans Verkuil (1): media: v4l2-ctrls: add support for V4L2_CTRL_WHICH_MIN/MAX_VAL Ming Qian (1): media: v4l2-ctrls: Add video encoder ROI ctrls Yunke Cao (2): media: v4l2_ctrl: Add V4L2_CTRL_TYPE_RECT media: vivid: Add an rectangle control .../media/v4l/ext-ctrls-codec.rst | 131 ++++++++++++++ .../media/v4l/vidioc-g-ext-ctrls.rst | 26 ++- .../media/v4l/vidioc-queryctrl.rst | 14 ++ .../media/videodev2.h.rst.exceptions | 4 + drivers/media/i2c/imx214.c | 4 +- .../media/platform/qcom/venus/venc_ctrls.c | 9 +- .../media/test-drivers/vivid/vivid-ctrls.c | 34 ++++ drivers/media/v4l2-core/v4l2-ctrls-api.c | 54 ++++-- drivers/media/v4l2-core/v4l2-ctrls-core.c | 169 +++++++++++++++--- drivers/media/v4l2-core/v4l2-ctrls-defs.c | 46 +++++ drivers/media/v4l2-core/v4l2-ioctl.c | 4 +- include/media/v4l2-ctrls.h | 62 ++++++- include/uapi/linux/v4l2-controls.h | 16 ++ include/uapi/linux/videodev2.h | 5 + 14 files changed, 529 insertions(+), 49 deletions(-)