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Subject[PATCH v2] v4l: Add source event change for bit-depth
Date
This event indicate that the source bit-depth is changed during
run-time. The client must get the new format and re-allocate buffers
for it. This can usually happens with video decoder (encoders) when
the bit-stream depth is changed from 8 to 10bits or vice versa.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
---
Change since v1: s/BITDEPTH/BIT_DEPTH

Documentation/media/uapi/v4l/vidioc-dqevent.rst | 7 +++++++
Documentation/media/videodev2.h.rst.exceptions | 1 +
include/uapi/linux/videodev2.h | 1 +
3 files changed, 9 insertions(+)

diff --git a/Documentation/media/uapi/v4l/vidioc-dqevent.rst b/Documentation/media/uapi/v4l/vidioc-dqevent.rst
index dea9c0cc00ab..f7782cbddc5f 100644
--- a/Documentation/media/uapi/v4l/vidioc-dqevent.rst
+++ b/Documentation/media/uapi/v4l/vidioc-dqevent.rst
@@ -397,6 +397,13 @@ call.
that many devices are not able to recover from a temporary loss of
signal and so restarting streaming I/O is required in order for the
hardware to synchronize to the video signal.
+ * - ``V4L2_EVENT_SRC_CH_BIT_DEPTH``
+ - 0x0002
+ - This event gets triggered when bit-depth change is detected from a
+ video decoder. Applications will have to query the new pixel format
+ and re-negotiate the queue. In most cases the streaming must be stopped
+ and restarted (:ref:`VIDIOC_STREAMOFF <VIDIOC_STREAMON>` followed by
+ :ref:`VIDIOC_STREAMON <VIDIOC_STREAMON>`).


Return Value
diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions
index 64d348e67df9..68ae00d7450f 100644
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions
@@ -478,6 +478,7 @@ replace define V4L2_EVENT_CTRL_CH_FLAGS ctrl-changes-flags
replace define V4L2_EVENT_CTRL_CH_RANGE ctrl-changes-flags

replace define V4L2_EVENT_SRC_CH_RESOLUTION src-changes-flags
+replace define V4L2_EVENT_SRC_CH_BIT_DEPTH src-changes-flags

replace define V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ :c:type:`v4l2_event_motion_det`

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 1050a75fb7ef..ecfdbaa60b05 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -2287,6 +2287,7 @@ struct v4l2_event_frame_sync {
};

#define V4L2_EVENT_SRC_CH_RESOLUTION (1 << 0)
+#define V4L2_EVENT_SRC_CH_BIT_DEPTH (1 << 1)

struct v4l2_event_src_change {
__u32 changes;
--
2.17.1
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