From: Peter Seiderer <ps.report@xxxxxxx>
This v4l2_buffer flag can be used by drivers to mark a capture buffer
as the last generated buffer, for example after a V4L2_DEC_CMD_STOP
command was issued.
Signed-off-by: Peter Seiderer <ps.report@xxxxxxx>
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
---
Changes since v1:
- Added documentation
---
Documentation/DocBook/media/v4l/io.xml | 10 ++++++++++
include/uapi/linux/videodev2.h | 2 ++
2 files changed, 12 insertions(+)
diff --git a/Documentation/DocBook/media/v4l/io.xml b/Documentation/DocBook/media/v4l/io.xml
index 1c17f80..f3b8bc0 100644
--- a/Documentation/DocBook/media/v4l/io.xml
+++ b/Documentation/DocBook/media/v4l/io.xml
@@ -1129,6 +1129,16 @@ in this buffer has not been created by the CPU but by some DMA-capable unit,
in which case caches have not been used.</entry>
</row>
<row>
+ <entry><constant>V4L2_BUF_FLAG_LAST</constant></entry>
+ <entry>0x00100000</entry>
+ <entry>Last buffer produced by the hardware. mem2mem codec drivers
+set this flag on the capture queue for the last buffer when the
+<link linkend="vidioc-querybuf">VIDIOC_QUERYBUF</link> or
+<link linkend="vidioc-qbuf">VIDIOC_DQBUF</link> ioctl is called. After the
+queue is drained, the <link linkend="vidioc-qbuf">VIDIOC_DQBUF</link> ioctl will
+not block anymore, but return an &EPIPE;.</entry>
+ </row>
+ <row>
<entry><constant>V4L2_BUF_FLAG_TIMESTAMP_MASK</constant></entry>
<entry>0x0000e000</entry>
<entry>Mask for timestamp types below. To test the
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index fbdc360..c642c10 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -809,6 +809,8 @@ struct v4l2_buffer {
#define V4L2_BUF_FLAG_TSTAMP_SRC_MASK 0x00070000
#define V4L2_BUF_FLAG_TSTAMP_SRC_EOF 0x00000000
#define V4L2_BUF_FLAG_TSTAMP_SRC_SOE 0x00010000
+/* mem2mem encoder/decoder */
+#define V4L2_BUF_FLAG_LAST 0x00100000
/**
* struct v4l2_exportbuffer - export of video buffer as DMABUF file descriptor
--
2.1.4
--
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