diff options
Diffstat (limited to 'Documentation/DocBook/media')
| -rw-r--r-- | Documentation/DocBook/media/v4l/io.xml | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/DocBook/media/v4l/io.xml b/Documentation/DocBook/media/v4l/io.xml index da65403..144158b 100644 --- a/Documentation/DocBook/media/v4l/io.xml +++ b/Documentation/DocBook/media/v4l/io.xml @@ -699,7 +699,7 @@ 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. +refers to a capture 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 @@ -720,14 +720,14 @@ linkend="buffer-flags" />.</entry> <entry>Indicates the field order of the image in the buffer, see <xref linkend="v4l2-field" />. This field is not used when the buffer contains VBI data. Drivers must set it when -<structfield>type</structfield> refers to an input stream, +<structfield>type</structfield> refers to a capture stream, applications when it refers to an output stream.</entry> </row> <row> <entry>struct timeval</entry> <entry><structfield>timestamp</structfield></entry> <entry></entry> - <entry><para>For input streams this is time when the first data + <entry><para>For capture streams this is time when the first data byte was captured, as returned by the <function>clock_gettime()</function> function for the relevant clock id; see <constant>V4L2_BUF_FLAG_TIMESTAMP_*</constant> in @@ -866,7 +866,7 @@ must 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. + refers to a capture 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) @@ -919,7 +919,7 @@ must set this to 0.</entry> <entry></entry> <entry>Offset in bytes to video data in the plane. Drivers must set this field when <structfield>type</structfield> - refers to an input stream, applications when it refers to an output stream. + refers to a capture stream, applications when it refers to an output stream. Note that data_offset is included in <structfield>bytesused</structfield>. So the size of the image in the plane is <structfield>bytesused</structfield>-<structfield>data_offset</structfield> at |
