[PATCH 2/8] videodev2.h: add V4L2_DEC_CMD_FLUSH
From: Jernej Skrabec <hidden>
Date: 2019-08-22 19:45:21
Also in:
linux-media, lkml
Subsystem:
documentation, media input infrastructure (v4l/dvb), the rest · Maintainers:
Jonathan Corbet, Mauro Carvalho Chehab, Linus Torvalds
From: Hans Verkuil <redacted> Add this new V4L2_DEC_CMD_FLUSH decoder command and document it. Signed-off-by: Hans Verkuil <redacted> Signed-off-by: Jernej Skrabec <redacted> --- Documentation/media/uapi/v4l/vidioc-decoder-cmd.rst | 11 ++++++++++- Documentation/media/videodev2.h.rst.exceptions | 1 + include/uapi/linux/videodev2.h | 1 + 3 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/Documentation/media/uapi/v4l/vidioc-decoder-cmd.rst b/Documentation/media/uapi/v4l/vidioc-decoder-cmd.rst
index 57f0066f4cff..0bffef6058f7 100644
--- a/Documentation/media/uapi/v4l/vidioc-decoder-cmd.rst
+++ b/Documentation/media/uapi/v4l/vidioc-decoder-cmd.rst@@ -208,7 +208,16 @@ introduced in Linux 3.3. They are, however, mandatory for stateful mem2mem decod been started yet, the driver will return an ``EPERM`` error code. When the decoder is already running, this command does nothing. No flags are defined for this command. - + * - ``V4L2_DEC_CMD_FLUSH`` + - 4 + - Flush any held capture buffers. Only valid for stateless decoders, + and only if ``V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF`` was set. + This command is typically used when the application reached the + end of the stream and the last output buffer had the + ``V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF`` flag set. This would prevent + dequeueing the last capture buffer containing the last decoded frame. + So this command can be used to explicitly flush that last decoded + frame. Return Value ============
diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions
index adeb6b7a15cb..a79028e4d929 100644
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions@@ -434,6 +434,7 @@ replace define V4L2_DEC_CMD_START decoder-cmds replace define V4L2_DEC_CMD_STOP decoder-cmds replace define V4L2_DEC_CMD_PAUSE decoder-cmds replace define V4L2_DEC_CMD_RESUME decoder-cmds +replace define V4L2_DEC_CMD_FLUSH decoder-cmds replace define V4L2_DEC_CMD_START_MUTE_AUDIO decoder-cmds replace define V4L2_DEC_CMD_PAUSE_TO_BLACK decoder-cmds
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 4fa9f543742d..91a79e16089c 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h@@ -1978,6 +1978,7 @@ struct v4l2_encoder_cmd { #define V4L2_DEC_CMD_STOP (1) #define V4L2_DEC_CMD_PAUSE (2) #define V4L2_DEC_CMD_RESUME (3) +#define V4L2_DEC_CMD_FLUSH (4) /* Flags for V4L2_DEC_CMD_START */ #define V4L2_DEC_CMD_START_MUTE_AUDIO (1 << 0)
--
2.22.1
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