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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7f1df5a4f9bsm3081690a34.23.2026.08.05.09.37.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 05 Aug 2026 09:37:12 -0700 (PDT) Message-ID: <320d38b1-1ef4-4f5e-91af-cad1cec59cd0@oss.qualcomm.com> Date: Wed, 5 Aug 2026 09:37:11 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] media: uapi: Introduce new control for video encoder ROI To: Bryan O'Donoghue , Mauro Carvalho Chehab , Vikash Garodia , Dikshita Agarwal , Abhinav Kumar Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, kernel test robot References: <20260804-enc_roi_enable-v3-0-e03b622a2d48@oss.qualcomm.com> <20260804-enc_roi_enable-v3-1-e03b622a2d48@oss.qualcomm.com> Content-Language: en-US From: Deepa Guthyappa Madivalara In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=Xea5Co55 c=1 sm=1 tr=0 ts=6a7366ba cx=c_pps a=z9lCQkyTxNhZyzAvolXo/A==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=OAOW8-Q4FRGSJhXIPGkA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=EyFUmsFV_t8cxB2kMr4A:22 X-Proofpoint-GUID: WDHr0Y9mcY-qyV0sNfilDapZqy5vFYlF X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA1MDEzNSBTYWx0ZWRfX+BCM2Csd6mqb L0toEtsrQiGt43WxLCdUP/BOUAa4QHnUbVdhMEkDEIdRgOWJqUf52FbCQyRqB7CybhBqWfCx3v5 hJWT5iE6Wj+IqwOCf385MTcEV4ggzwYyi0+u1mR6ssqZLRvfEYteERSlMYI1gF603lec4FrXru3 uPROeJaQLBFC8PIOnpvTVtAMGvHKjncbvS+ujuqvqPtG/vQmo8BVyFZUhgpnaM7C0x83Do1ibYX B7RqsRoaj0AvQI7nu+FNv+KbysbyQlLr47iZnzr8EZvf+CNoaKVIj+/oGL4stKQzb60zFd/GPRI 1h9RvrU1vhQzvCRXTp5kYfcWNa9o0jolx8p7/EcVW3XP3etMnrPxLYeZYzEW6rzYzg8FOcWa1Gm eDfsJ7P4Pcy6yBj51o5kgEkiEE+MEjM7JUJ6Y2fAKMxSrS7JpOLhWZ6LMqqVhwIc6mt4Gw21Pfr zlMjYkXUMrPpT8EaQSw== X-Proofpoint-Spam-Info: AW1haW4tMjYwODA1MDEzNSBTYWx0ZWRfX285yhWr64ZK+ IcZc7PuAHsaO8J3p1owXG+pVnaZlkjpDbHsS5pGVzFMWKXZKNYsjMGN2Ngatj2hW0fLLl7UcZHD rga4p//t19z8ks3wsx+rCFgnsEMEdiE= X-Proofpoint-ORIG-GUID: WDHr0Y9mcY-qyV0sNfilDapZqy5vFYlF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-05_05,2026-08-04_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 suspectscore=0 bulkscore=0 clxscore=1015 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608050135 On 8/4/2026 8:49 PM, Bryan O'Donoghue wrote: > On 04/08/2026 21:05, Deepa Guthyappa Madivalara wrote: >> Add custom control, V4L2_CID_MPEG_VIDEO_ROI_MB_DELTA_QP for >> video encoder Region of Interest to allow applications to specify >> different quality levels for specific regions in video frames. Define >> V4L2_CID_MPEG_VIDEO_ROI_MB_SIZE to retrieve supported MB size based on >> codec from the hardware encoder and set the corresponding ROI MB >> delta_qp >> map that adjusts quantization relative to the frame QP's base value. >> >> This enables use cases like prioritizing quality for faces in video >> conferencing or important objects in surveillance footage while reducing >> bitrate for less critical areas. >> >> Signed-off-by: Deepa Guthyappa Madivalara >> >> --- >>   .../userspace-api/media/v4l/ext-ctrls-codec.rst       | 19 >> +++++++++++++++++++ >>   .../media/v4l/videodev2.h.rst.exceptions              |  1 + >>   .../userspace-api/media/v4l/vidioc-g-ext-ctrls.rst    |  4 ++++ >>   .../userspace-api/media/v4l/vidioc-queryctrl.rst      |  6 ++++++ >>   include/media/v4l2-ctrls.h                            |  1 + >>   include/uapi/linux/v4l2-controls.h                    |  2 ++ >>   include/uapi/linux/videodev2.h                        |  3 +++ >>   7 files changed, 36 insertions(+) >> >> diff --git >> a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst >> b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst >> index >> ab865a1a6ba929f1725ce2ab0fd3aeee4a69329a..0f8179de8f742253a5152231592fb8b4355298f7 >> 100644 >> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst >> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst >> @@ -1674,6 +1674,25 @@ enum >> v4l2_mpeg_video_h264_hierarchical_coding_type - >>       Codecs need to always use the specified range, rather then a HW >> custom range. >>       Applicable to encoders >> >> +``V4L2_CID_MPEG_VIDEO_ROI_MB_DELTA_QP (__s8)`` >> +    This custom control is used to set ROI MB map delta_Qp for whole >> frame. > > "a whole frame" or "the whole frame" > Will update to "the whole frame in v4" >> +    The frame is divided into a grid of MB Size by MB Size pixels >> (MB Size is >> +    obtained from querying ``V4L2_CID_MPEG_VIDEO_ROI_MB_SIZE``). >> Each block >> +    is configured with delta_Qp in raster order. The valid range for >> delta_Qp >> +    is encoder dependent. >> +    Applicable to encoders. >> + >> +``V4L2_CID_MPEG_VIDEO_ROI_MB_SIZE`` (integer) >> +    A read-only control that reports the MB Size used for the ROI >> delta_QP map. >> +    The supported MB Size depends on the encoder codec. >> +    Only square macroblocks are supported. The value returned >> represents the > > macro-blocks ? I will use MBs to keep it consistent. (in v4) > >> +    width and height of each block in pixels. The ROI delta_QP map >> provided >> +    through the ROI control must use the MB Size reported by this >> control. >> +    The number of entries in the ROI delta_QP array is determined by >> the >> +    frame dimensions and the reported MB Size. For example, for a >> QCIF frame >> +    (176x144) if reported MB Size is 16, the delta_QP array must >> contain >> +    99 entries (176 x 144 / 16 x 16). >> + >>   .. raw:: latex >> >>       \normalsize >> diff --git >> a/Documentation/userspace-api/media/v4l/videodev2.h.rst.exceptions >> b/Documentation/userspace-api/media/v4l/videodev2.h.rst.exceptions >> index >> 6182b4e2d2ee002c0d3562e1cc3bc2fd9c4286d6..b036ed3ec2f0744175cad1cbc4e73fe828e0c955 >> 100644 >> --- a/Documentation/userspace-api/media/v4l/videodev2.h.rst.exceptions >> +++ b/Documentation/userspace-api/media/v4l/videodev2.h.rst.exceptions >> @@ -141,6 +141,7 @@ replace symbol V4L2_CTRL_TYPE_STRING >> :c:type:`V4L.v4l2_ctrl_type` >>   replace symbol V4L2_CTRL_TYPE_U16 :c:type:`V4L.v4l2_ctrl_type` >>   replace symbol V4L2_CTRL_TYPE_U32 :c:type:`V4L.v4l2_ctrl_type` >>   replace symbol V4L2_CTRL_TYPE_U8 :c:type:`V4L.v4l2_ctrl_type` >> +replace symbol V4L2_CTRL_TYPE_S8 :c:type:`V4L.v4l2_ctrl_type` >>   replace symbol V4L2_CTRL_TYPE_MPEG2_SEQUENCE >> :c:type:`V4L.v4l2_ctrl_type` >>   replace symbol V4L2_CTRL_TYPE_MPEG2_PICTURE >> :c:type:`V4L.v4l2_ctrl_type` >>   replace symbol V4L2_CTRL_TYPE_MPEG2_QUANTISATION >> :c:type:`V4L.v4l2_ctrl_type` >> diff --git >> a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst >> b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst >> index >> d78328152b7552f8f0d30a9e2f7c104bfd4b70d3..fe5f8992389c32d8f35f432229ef2f734002644e >> 100644 >> --- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst >> +++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst >> @@ -188,6 +188,10 @@ still cause this situation. >>         - ``p_u32`` >>         - A pointer to a matrix control of unsigned 32-bit values. >> Valid if >>       this control is of type ``V4L2_CTRL_TYPE_U32``. >> +    * - __s8 * >> +      - ``p_s8`` >> +      - A pointer to a matrix control of signed 8-bit values. Valid if >> +    this control is of type ``V4L2_CTRL_TYPE_S8``. >>       * - __s32 * >>         - ``p_s32`` >>         - A pointer to a matrix control of signed 32-bit values. >> Valid if >> diff --git >> a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst >> b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst >> index >> 82c8b52e771ce9301491b3f752e501a8fe7e2434..57e1652ae72e0324742142446acf32a16b94941c >> 100644 >> --- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst >> +++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst >> @@ -425,6 +425,12 @@ See also the examples in :ref:`control`. >>         - any >>         - An unsigned 32-bit valued control ranging from minimum to >> maximum >>       inclusive. The step value indicates the increment between values. >> +    * - ``V4L2_CTRL_TYPE_S8`` >> +      - any >> +      - any >> +      - any >> +      - A signed 8-bit valued control ranging from minimum to maximum >> +    inclusive. The step value indicates the increment between values. >>       * - ``V4L2_CTRL_TYPE_MPEG2_QUANTISATION`` >>         - n/a >>         - n/a >> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h >> index >> 327976b14d50b73a631e4d2ed95d9f4d146c45ab..a1806ddbc797efa52e83cd3f685ef70d5b5483d2 >> 100644 >> --- a/include/media/v4l2-ctrls.h >> +++ b/include/media/v4l2-ctrls.h >> @@ -64,6 +64,7 @@ union v4l2_ctrl_ptr { >>       s32 *p_s32; >>       s64 *p_s64; >>       u8 *p_u8; >> +    s8 *p_s8; >>       u16 *p_u16; >>       u32 *p_u32; >>       char *p_char; >> diff --git a/include/uapi/linux/v4l2-controls.h >> b/include/uapi/linux/v4l2-controls.h >> index >> affec0ab4781507be761cb791ff737460acf9cb7..00a2c48630bd198faa9a2b833a9aa346d8357555 >> 100644 >> --- a/include/uapi/linux/v4l2-controls.h >> +++ b/include/uapi/linux/v4l2-controls.h >> @@ -920,6 +920,8 @@ enum v4l2_mpeg_video_av1_level { >>   }; >> >>   #define V4L2_CID_MPEG_VIDEO_AVERAGE_QP  (V4L2_CID_CODEC_BASE + 657) >> +#define V4L2_CID_MPEG_VIDEO_ROI_MB_DELTA_QP (V4L2_CID_CODEC_BASE + 658) >> +#define V4L2_CID_MPEG_VIDEO_ROI_MB_SIZE  (V4L2_CID_CODEC_BASE + 659) >> >>   /*  MPEG-class control IDs specific to the CX2341x driver as >> defined by V4L2 */ >>   #define V4L2_CID_CODEC_CX2341X_BASE (V4L2_CTRL_CLASS_CODEC | 0x1000) >> diff --git a/include/uapi/linux/videodev2.h >> b/include/uapi/linux/videodev2.h >> index >> 5373dba640fae3d19247ab1c74ba336e05dc0fe0..3ed343f8c81e0c9240d5a7e5b2dfe365a529fb6c >> 100644 >> --- a/include/uapi/linux/videodev2.h >> +++ b/include/uapi/linux/videodev2.h >> @@ -1884,6 +1884,7 @@ struct v4l2_ext_control { >>           __s64 value64; >>           char __user *string; >>           __u8 __user *p_u8; >> +        __s8 __user *p_s8; >>           __u16 __user *p_u16; >>           __u32 __user *p_u32; >>           __s32 __user *p_s32; >> @@ -1961,6 +1962,7 @@ enum v4l2_ctrl_type { >>       V4L2_CTRL_TYPE_U8         = 0x0100, >>       V4L2_CTRL_TYPE_U16         = 0x0101, >>       V4L2_CTRL_TYPE_U32         = 0x0102, >> +    V4L2_CTRL_TYPE_S8         = 0x0103, >>       V4L2_CTRL_TYPE_AREA          = 0x0106, >>       V4L2_CTRL_TYPE_RECT         = 0x0107, >> >> @@ -1997,6 +1999,7 @@ enum v4l2_ctrl_type { >>       V4L2_CTRL_TYPE_AV1_TILE_GROUP_ENTRY = 0x281, >>       V4L2_CTRL_TYPE_AV1_FRAME        = 0x282, >>       V4L2_CTRL_TYPE_AV1_FILM_GRAIN        = 0x283, >> + > > stray \n > sorry, will fix this in v4 >>   }; >> >>   /*  Used in the VIDIOC_QUERYCTRL ioctl for querying controls */ >> >> -- >> 2.34.1 >> >