media: videodev2.h: add V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM

Add an enum_fmt format flag to specifically tag coded formats where
full bytestream parsing is supported by the device.

Some stateful decoders are capable of fully parsing a bytestream,
but others require that userspace pre-parses the bytestream into
frames or fields (see the corresponding pixelformat descriptions
for details).

If this flag is set, then this pre-parsing step is not required
(but still possible, of course).

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
index 822d673..ebc05ce 100644 (file)
--- a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
+++ b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
@@ -127,6 +127,14 @@ one until ``EINVAL`` is returned.
       - This format is not native to the device but emulated through
        software (usually libv4l2), where possible try to use a native
        format instead for better performance.
+    * - ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
+      - 0x0004
+      - The hardware decoder for this compressed bytestream format (aka coded
+       format) is capable of parsing a continuous bytestream. Applications do
+       not need to parse the bytestream themselves to find the boundaries
+       between frames/fields. This flag can only be used in combination with
+       the ``V4L2_FMT_FLAG_COMPRESSED`` flag, since this applies to compressed
+       formats only. This flag is valid for stateful decoders only.
 
 
 Return Value

diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions
index 8e7d349..a0640b6 100644 (file)
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions
@@ -180,6 +180,7 @@ replace define V4L2_PIX_FMT_FLAG_PREMUL_ALPHA reserved-formats
 # V4L2 format flags
 replace define V4L2_FMT_FLAG_COMPRESSED fmtdesc-flags
 replace define V4L2_FMT_FLAG_EMULATED fmtdesc-flags
+replace define V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM fmtdesc-flags
 
 # V4L2 timecode types
 replace define V4L2_TC_TYPE_24FPS timecode-type

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 2427bc4..67077d5 100644 (file)
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -774,8 +774,9 @@ struct v4l2_fmtdesc {
        __u32               reserved[4];
 };
 
-#define V4L2_FMT_FLAG_COMPRESSED 0x0001
-#define V4L2_FMT_FLAG_EMULATED   0x0002
+#define V4L2_FMT_FLAG_COMPRESSED               0x0001
+#define V4L2_FMT_FLAG_EMULATED                 0x0002
+#define V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM    0x0004
 
        /* Frame Size and frame rate enumeration */
 /*