linux-kernel - [PATCH v5 03/14] media:Add v4l2 buf flag codec data.

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Message-Id: <4998d30d00ccea83bf1570b511b22c63f12fe156.1627353315.git.ming.qian@nxp.com>
Date:   Tue, 27 Jul 2021 11:20:46 +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 v5 03/14] media:Add v4l2 buf flag codec data.

In some decoing scenarios, application may queue a buffer
that only contains codec config data, and the driver needs to
know whether is it a frame or not.
So we add a buf flag to tell this case.

Signed-off-by: Ming Qian <ming.qian@....com>
Signed-off-by: Shijie Qin <shijie.qin@....com>
Signed-off-by: Zhou Peng <eagle.zhou@....com>
---
 Documentation/userspace-api/media/v4l/buffer.rst | 8 ++++++++
 include/uapi/linux/videodev2.h                   | 1 +
 2 files changed, 9 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/buffer.rst b/Documentation/userspace-api/media/v4l/buffer.rst
index 4f95496adc5b..7f32c5fd6b11 100644
--- a/Documentation/userspace-api/media/v4l/buffer.rst
+++ b/Documentation/userspace-api/media/v4l/buffer.rst
@@ -611,6 +611,14 @@ Buffer Flags
 	the format. Any Any subsequent call to the
 	:ref:`VIDIOC_DQBUF <VIDIOC_QBUF>` ioctl will not block anymore,
 	but return an ``EPIPE`` error code.
+    * .. _`V4L2-BUF-FLAG-CODECCONFIG`:
+
+      - ``V4L2_BUF_FLAG_CODECCONFIG``
+      - 0x00200000
+      - The buffer only contains codec config data, eg. sps and pps.
+    Applications can set this bit when ``type`` refers to an output
+    stream, this flag is usually used by v4l2 decoder.
+
     * .. _`V4L2-BUF-FLAG-REQUEST-FD`:
 
       - ``V4L2_BUF_FLAG_REQUEST_FD``
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 4836590a690c..242731cb6556 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1110,6 +1110,7 @@ static inline __u64 v4l2_timeval_to_ns(const struct timeval *tv)
 #define V4L2_BUF_FLAG_TSTAMP_SRC_SOE		0x00010000
 /* mem2mem encoder/decoder */
 #define V4L2_BUF_FLAG_LAST			0x00100000
+#define V4L2_BUF_FLAG_CODECCONFIG		0x00200000
 /* request_fd is valid */
 #define V4L2_BUF_FLAG_REQUEST_FD		0x00800000
 
-- 
2.32.0