linux-kernel - [PATCH v8 04/15] media:Add v4l2 event codec

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Date:   Tue,  7 Sep 2021 17:49:11 +0800
From:   Ming Qian <ming.qian@....com>
To:     mchehab@...nel.org, shawnguo@...nel.org, robh+dt@...nel.org,
        s.hauer@...gutronix.de
Cc:     hverkuil-cisco@...all.nl, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, aisheng.dong@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v8 04/15] media:Add v4l2 event codec_error and skip

The codec_error event can tell client that
there are some error occurs in the decoder engine.

The skip event can tell the client that
there are a frame has been decoded,
but it won't be outputed.

Signed-off-by: Ming Qian <ming.qian@....com>
Signed-off-by: Shijie Qin <shijie.qin@....com>
Signed-off-by: Zhou Peng <eagle.zhou@....com>
---
 .../userspace-api/media/v4l/vidioc-dqevent.rst       | 12 ++++++++++++
 include/uapi/linux/videodev2.h                       |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst b/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
index 6eb40073c906..87d40ad25604 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
@@ -182,6 +182,18 @@ call.
 	the regions changes. This event has a struct
 	:c:type:`v4l2_event_motion_det`
 	associated with it.
+    * - ``V4L2_EVENT_CODEC_ERROR``
+      - 7
+      - This event is triggered when some error occurs inside the codec engine,
+	usually it can be replaced by a POLLERR event, but in some cases, the POLLERR
+	may cause the application to exit, but this event can allow the application to
+	handle the codec error without exiting.
+    * - ``V4L2_EVENT_SKIP``
+      - 8
+      - This event is triggered when one frame is decoded, but it won't be outputed
+	to the display. So the application can't get this frame, and the input frame count
+	is dismatch with the output frame count. And this evevt is telling the client to
+	handle this case.
     * - ``V4L2_EVENT_PRIVATE_START``
       - 0x08000000
       - Base event number for driver-private events.
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 5bb0682b4a23..c56640d42dc5 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -2369,6 +2369,8 @@ struct v4l2_streamparm {
 #define V4L2_EVENT_FRAME_SYNC			4
 #define V4L2_EVENT_SOURCE_CHANGE		5
 #define V4L2_EVENT_MOTION_DET			6
+#define V4L2_EVENT_CODEC_ERROR			7
+#define V4L2_EVENT_SKIP				8
 #define V4L2_EVENT_PRIVATE_START		0x08000000
 
 /* Payload for V4L2_EVENT_VSYNC */
-- 
2.32.0