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authorLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2013-08-01 21:34:52 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2013-08-18 07:18:43 -0300
commitc09aada7ac8a8c03970bd2fb41176647da7cef99 (patch)
tree4a13e42e87706442119eede4dedef6a3ed6b3a71 /Documentation/DocBook
parent5c7b25b90d36942c524d06522ebaf0510a75592a (diff)
[media] Documentation: media: Clarify the VIDIOC_CREATE_BUFS format requirements
The VIDIOC_CREATE_BUFS ioctl takes a format argument that must contain a valid format supported by the driver. Clarify the documentation. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r--Documentation/DocBook/media/v4l/vidioc-create-bufs.xml41
1 files changed, 26 insertions, 15 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml b/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
index cd9943672434..9b700a5f4df7 100644
--- a/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
@@ -62,18 +62,29 @@ addition to the <constant>VIDIOC_REQBUFS</constant> ioctl, when a tighter
control over buffers is required. This ioctl can be called multiple times to
create buffers of different sizes.</para>
- <para>To allocate device buffers applications initialize relevant fields of
-the <structname>v4l2_create_buffers</structname> structure. They set the
-<structfield>type</structfield> field in the
-&v4l2-format; structure, embedded in this
-structure, to the respective stream or buffer type.
-<structfield>count</structfield> must be set to the number of required buffers.
-<structfield>memory</structfield> specifies the required I/O method. The
-<structfield>format</structfield> field shall typically be filled in using
-either the <constant>VIDIOC_TRY_FMT</constant> or
-<constant>VIDIOC_G_FMT</constant> ioctl(). Additionally, applications can adjust
-<structfield>sizeimage</structfield> fields to fit their specific needs. The
-<structfield>reserved</structfield> array must be zeroed.</para>
+ <para>To allocate the device buffers applications must initialize the
+relevant fields of the <structname>v4l2_create_buffers</structname> structure.
+The <structfield>count</structfield> field must be set to the number of
+requested buffers, the <structfield>memory</structfield> field specifies the
+requested I/O method and the <structfield>reserved</structfield> array must be
+zeroed.</para>
+
+ <para>The <structfield>format</structfield> field specifies the image format
+that the buffers must be able to handle. The application has to fill in this
+&v4l2-format;. Usually this will be done using the
+<constant>VIDIOC_TRY_FMT</constant> or <constant>VIDIOC_G_FMT</constant> ioctl()
+to ensure that the requested format is supported by the driver. Unsupported
+formats will result in an error.</para>
+
+ <para>The buffers created by this ioctl will have as minimum size the size
+defined by the <structfield>format.pix.sizeimage</structfield> field. If the
+<structfield>format.pix.sizeimage</structfield> field is less than the minimum
+required for the given format, then <structfield>sizeimage</structfield> will be
+increased by the driver to that minimum to allocate the buffers. If it is
+larger, then the value will be used as-is. The same applies to the
+<structfield>sizeimage</structfield> field of the
+<structname>v4l2_plane_pix_format</structname> structure in the case of
+multiplanar formats.</para>
<para>When the ioctl is called with a pointer to this structure the driver
will attempt to allocate up to the requested number of buffers and store the
@@ -144,9 +155,9 @@ mapped</link> I/O.</para>
<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>The buffer type (<structfield>type</structfield> field) or the
-requested I/O method (<structfield>memory</structfield>) is not
-supported.</para>
+ <para>The buffer type (<structfield>format.type</structfield> field),
+requested I/O method (<structfield>memory</structfield>) or format
+(<structfield>format</structfield> field) is not valid.</para>
</listitem>
</varlistentry>
</variablelist>