From: Shunqian Zheng <[email protected]> Add V4L2_CID_JPEG_LUMA/CHROMA_QUANTIZATION controls to allow userspace configure the JPEG quantization tables.
Signed-off-by: Shunqian Zheng <[email protected]> Signed-off-by: Ezequiel Garcia <[email protected]> --- Documentation/media/uapi/v4l/extended-controls.rst | 9 +++++++++ drivers/media/v4l2-core/v4l2-ctrls.c | 4 ++++ include/uapi/linux/v4l2-controls.h | 3 +++ 3 files changed, 16 insertions(+) diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst index 9f7312bf3365..80e26f81900b 100644 --- a/Documentation/media/uapi/v4l/extended-controls.rst +++ b/Documentation/media/uapi/v4l/extended-controls.rst @@ -3354,6 +3354,15 @@ JPEG Control IDs Specify which JPEG markers are included in compressed stream. This control is valid only for encoders. +.. _jpeg-quant-tables-control: + +``V4L2_CID_JPEG_LUMA_QUANTIZATION (__u8 matrix)`` + Sets the luma quantization table to be used for encoding + or decoding a V4L2_PIX_FMT_JPEG_RAW format buffer. This table is + expected to be in JPEG zigzag order, as per the JPEG specification. + +``V4L2_CID_JPEG_CHROMA_QUANTIZATION (__u8 matrix)`` + Sets the chroma quantization table. .. flat-table:: diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index 599c1cbff3b9..5c62c3101851 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -999,6 +999,8 @@ const char *v4l2_ctrl_get_name(u32 id) case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval"; case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality"; case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers"; + case V4L2_CID_JPEG_LUMA_QUANTIZATION: return "Luminance Quantization Matrix"; + case V4L2_CID_JPEG_CHROMA_QUANTIZATION: return "Chrominance Quantization Matrix"; /* Image source controls */ /* Keep the order of the 'case's the same as in v4l2-controls.h! */ @@ -1284,6 +1286,8 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, *flags |= V4L2_CTRL_FLAG_READ_ONLY; break; case V4L2_CID_DETECT_MD_REGION_GRID: + case V4L2_CID_JPEG_LUMA_QUANTIZATION: + case V4L2_CID_JPEG_CHROMA_QUANTIZATION: *type = V4L2_CTRL_TYPE_U8; break; case V4L2_CID_DETECT_MD_THRESHOLD_GRID: diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h index e4ee10ee917d..a466acf40625 100644 --- a/include/uapi/linux/v4l2-controls.h +++ b/include/uapi/linux/v4l2-controls.h @@ -987,6 +987,9 @@ enum v4l2_jpeg_chroma_subsampling { #define V4L2_JPEG_ACTIVE_MARKER_DQT (1 << 17) #define V4L2_JPEG_ACTIVE_MARKER_DHT (1 << 18) +#define V4L2_CID_JPEG_LUMA_QUANTIZATION (V4L2_CID_JPEG_CLASS_BASE + 5) +#define V4L2_CID_JPEG_CHROMA_QUANTIZATION (V4L2_CID_JPEG_CLASS_BASE + 6) + /* Image source controls */ #define V4L2_CID_IMAGE_SOURCE_CLASS_BASE (V4L2_CTRL_CLASS_IMAGE_SOURCE | 0x900) -- 2.18.0
