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 | 25 +++++++++++++++++++
.../media/videodev2.h.rst.exceptions | 1 +
drivers/media/v4l2-core/v4l2-ctrls.c | 8 ++++++
include/uapi/linux/v4l2-controls.h | 10 ++++++++
include/uapi/linux/videodev2.h | 1 +
5 files changed, 45 insertions(+)
diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst
index 65a1d873196b..6effae175be1 100644
--- a/Documentation/media/uapi/v4l/extended-controls.rst
+++ b/Documentation/media/uapi/v4l/extended-controls.rst
@@ -3530,7 +3530,32 @@ 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.
+ This control supports 8-bit quantization coefficients, for
+ the baseline profile, as specified by :ref:`itu-t81`.
+ 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
+ - ``luma_quantization_matrix[64]``
+ - Sets the luma quantization table.
+
+ * - __u8
+ - ``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 1c043d552313..fbdd827e4229 100644
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions
@@ -131,6 +131,7 @@ 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_MPEG2_SLICE_PARAMS :c:type:`v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_MPEG2_QUANTIZATION :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 dfdc31edb1dd..7b913a461b2e 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1001,6 +1001,7 @@ 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! */
@@ -1288,6 +1289,9 @@ 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;
@@ -1667,6 +1671,7 @@ static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
return 0;
case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
+ case V4L2_CTRL_TYPE_JPEG_QUANTIZATION:
return 0;
default:
@@ -2249,6 +2254,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization);
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 51b095898f4b..5a8bdb732cfe 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -990,6 +990,16 @@ 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.
+ * This control only supports the former, for the baseline profile.
+ */
+ __u8 luma_quantization_matrix[64];
+ __u8 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 4c979886e8b2..8481a8ea8262 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1661,6 +1661,7 @@ enum v4l2_ctrl_type {
V4L2_CTRL_TYPE_U32 = 0x0102,
V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS = 0x0103,
V4L2_CTRL_TYPE_MPEG2_QUANTIZATION = 0x0104,
+ V4L2_CTRL_TYPE_JPEG_QUANTIZATION = 0x0105,
};
/* Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
--
2.19.0.rc2
