From: Shunqian Zheng <zhengsq@xxxxxxxxxxxxxx>
Add V4L2_CID_JPEG_QUANTIZATION compound control to allow userspace
configure the JPEG quantization tables.
Signed-off-by: Shunqian Zheng <zhengsq@xxxxxxxxxxxxxx>
Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
---
.../media/uapi/v4l/extended-controls.rst | 31 +++++++++++++++++++
.../media/videodev2.h.rst.exceptions | 1 +
drivers/media/v4l2-core/v4l2-ctrls.c | 10 ++++++
include/uapi/linux/v4l2-controls.h | 12 +++++++
include/uapi/linux/videodev2.h | 1 +
5 files changed, 55 insertions(+)
diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst
index 9f7312bf3365..1335d27d30f3 100644
--- a/Documentation/media/uapi/v4l/extended-controls.rst
+++ b/Documentation/media/uapi/v4l/extended-controls.rst
@@ -3354,7 +3354,38 @@ 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_QUANTIZATION (struct)``
+ Specifies the luma and chroma quantization matrices for encoding
+ or decoding a V4L2_PIX_FMT_JPEG_RAW format buffer. The :ref:`itu-t81`
+ specification allows 8-bit quantization coefficients for
+ baseline profile images, and 8-bit or 16-bit for extended profile
+ images. Supporting or not 16-bit precision coefficients is driver-specific.
+ Coefficients must be set in JPEG zigzag scan order.
+
+
+.. c:type:: struct v4l2_ctrl_jpeg_quantization
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_jpeg_quantization
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u8
+ - ``precision``
+ - Specifies the coefficient precision. User shall set 0
+ for 8-bit, and 1 for 16-bit.
+
+ * - __u16
+ - ``luma_quantization_matrix[64]``
+ - Sets the luma quantization table.
+
+ * - __u16
+ - ``chroma_quantization_matrix[64]``
+ - Sets the chroma quantization table.
.. flat-table::
:header-rows: 0
diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions
index ca9f0edc579e..a0a38e92bf38 100644
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions
@@ -129,6 +129,7 @@ replace symbol V4L2_CTRL_TYPE_STRING :c:type:`v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_U16 :c:type:`v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_U32 :c:type:`v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_U8 :c:type:`v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_JPEG_QUANTIZATION :c:type:`v4l2_ctrl_type`
# V4L2 capability defines
replace define V4L2_CAP_VIDEO_CAPTURE device-capabilities
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 599c1cbff3b9..305bd7a9b7f1 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -999,6 +999,7 @@ 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_QUANTIZATION: return "JPEG Quantization Tables";
/* Image source controls */
/* Keep the order of the 'case's the same as in v4l2-controls.h! */
@@ -1286,6 +1287,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
case V4L2_CID_DETECT_MD_REGION_GRID:
*type = V4L2_CTRL_TYPE_U8;
break;
+ case V4L2_CID_JPEG_QUANTIZATION:
+ *type = V4L2_CTRL_TYPE_JPEG_QUANTIZATION;
+ break;
case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
*type = V4L2_CTRL_TYPE_U16;
break;
@@ -1612,6 +1616,9 @@ static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
return -ERANGE;
return 0;
+ case V4L2_CTRL_TYPE_JPEG_QUANTIZATION:
+ return 0;
+
default:
return -EINVAL;
}
@@ -2133,6 +2140,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
case V4L2_CTRL_TYPE_U32:
elem_size = sizeof(u32);
break;
+ case V4L2_CTRL_TYPE_JPEG_QUANTIZATION:
+ elem_size = sizeof(struct v4l2_ctrl_jpeg_quantization);
+ break;
default:
if (type < V4L2_CTRL_COMPOUND_TYPES)
elem_size = sizeof(s32);
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index e4ee10ee917d..856b3325052f 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -987,6 +987,18 @@ 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_QUANTIZATION (V4L2_CID_JPEG_CLASS_BASE + 5)
+struct v4l2_ctrl_jpeg_quantization {
+ /* ITU-T.81 specifies two quantization coefficient precisions:
+ * 8-bit for baseline profile,
+ * 8-bit or 16-bit for extended profile.
+ *
+ * User shall set "precision" to 0 for 8-bit and 1 for 16-bit.
+ */
+ __u8 precision;
+ __u16 luma_quantization_matrix[64];
+ __u16 chroma_quantization_matrix[64];
+};
/* Image source controls */
#define V4L2_CID_IMAGE_SOURCE_CLASS_BASE (V4L2_CTRL_CLASS_IMAGE_SOURCE | 0x900)
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index f9f3ae5b489e..8ace47cb1003 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1637,6 +1637,7 @@ enum v4l2_ctrl_type {
V4L2_CTRL_TYPE_U8 = 0x0100,
V4L2_CTRL_TYPE_U16 = 0x0101,
V4L2_CTRL_TYPE_U32 = 0x0102,
+ V4L2_CTRL_TYPE_JPEG_QUANTIZATION = 0x0103,
};
/* Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
--
2.18.0
