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Subject: [media] DocBook media: update bytesused field description Author: Hans Verkuil <[email protected]> Date: Mon Apr 7 10:01:28 2014 -0300 For output buffers the application has to set the bytesused field. In reality applications often do not set this since drivers that deal with fix image sizes just override it anyway. The vb2 framework will replace this field with the length field if bytesused was set to 0 by the application, which is what happens in practice. Document this behavior. Signed-off-by: Hans Verkuil <[email protected]> Acked-by: Sakari Ailus <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Documentation/DocBook/media/v4l/io.xml | 13 +++++++++++-- 1 files changed, 11 insertions(+), 2 deletions(-) --- http://git.linuxtv.org/media_tree.git?a=commitdiff;h=b050b29e071a0b11262ad513700ab073f58c45b2 diff --git a/Documentation/DocBook/media/v4l/io.xml b/Documentation/DocBook/media/v4l/io.xml index 97a69bf..188e621 100644 --- a/Documentation/DocBook/media/v4l/io.xml +++ b/Documentation/DocBook/media/v4l/io.xml @@ -699,7 +699,12 @@ linkend="v4l2-buf-type" /></entry> buffer. It depends on the negotiated data format and may change with each buffer for compressed variable size data like JPEG images. Drivers must set this field when <structfield>type</structfield> -refers to an input stream, applications when it refers to an output stream.</entry> +refers to an input stream, applications when it refers to an output stream. +If the application sets this to 0 for an output stream, then +<structfield>bytesused</structfield> will be set to the size of the +buffer (see the <structfield>length</structfield> field of this struct) by +the driver. For multiplanar formats this field is ignored and the +<structfield>planes</structfield> pointer is used instead.</entry> </row> <row> <entry>__u32</entry> @@ -861,7 +866,11 @@ should set this to 0.</entry> <entry></entry> <entry>The number of bytes occupied by data in the plane (its payload). Drivers must set this field when <structfield>type</structfield> - refers to an input stream, applications when it refers to an output stream.</entry> + refers to an input stream, applications when it refers to an output stream. + If the application sets this to 0 for an output stream, then + <structfield>bytesused</structfield> will be set to the size of the + plane (see the <structfield>length</structfield> field of this struct) + by the driver.</entry> </row> <row> <entry>__u32</entry> _______________________________________________ linuxtv-commits mailing list [email protected] http://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
