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Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

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* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (655 commits)
  [media] revert patch: HDIC HD29L2 DMB-TH USB2.0 reference design driver
  mb86a20s: Add a few more register settings at the init seq
  mb86a20s: Group registers into the same line
  [media] [PATCH] don't reset the delivery system on DTV_CLEAR
  [media] [BUG] it913x-fe fix typo error making SNR levels unstable
  [media] cx23885: Query the CX25840 during enum_input for status
  [media] cx25840: Add support for g_input_status
  [media] rc-videomate-m1f.c Rename to match remote controler name
  [media] drivers: media: au0828: Fix dependency for VIDEO_AU0828
  [media] convert drivers/media/* to use module_platform_driver()
  [media] drivers: video: cx231xx: Fix dependency for VIDEO_CX231XX_DVB
  [media] Exynos4 JPEG codec v4l2 driver
  [media] doc: v4l: selection: choose pixels as units for selection rectangles
  [media] v4l: s5p-tv: mixer: fix setup of VP scaling
  [media] v4l: s5p-tv: mixer: add support for selection API
  [media] v4l: emulate old crop API using extended crop/compose API
  [media] doc: v4l: add documentation for selection API
  [media] doc: v4l: add binary images for selection API
  [media] v4l: add support for selection api
  [media] hd29l2: fix review findings
  ...
This commit is contained in:
Linus Torvalds
2012-01-15 12:49:56 -08:00
parent 16008d6416 1264000339
commit 122804ecb5
555 changed files with 31470 additions and 14536 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
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19
Documentation/DocBook/media/dvb/dvbproperty.xml
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@@ -334,9 +334,10 @@ typedef enum fe_rolloff {
<title>fe_delivery_system type</title>
<para>Possible values: </para>
<programlisting>
typedef enum fe_delivery_system {
SYS_UNDEFINED,
SYS_DVBC_ANNEX_AC,
SYS_DVBC_ANNEX_A,
SYS_DVBC_ANNEX_B,
SYS_DVBT,
SYS_DSS,
@@ -353,6 +354,7 @@ typedef enum fe_delivery_system {
SYS_DAB,
SYS_DVBT2,
SYS_TURBO,
SYS_DVBC_ANNEX_C,
} fe_delivery_system_t;
</programlisting>
</section>
@@ -647,6 +649,18 @@ typedef enum fe_hierarchy {
many data types via a single multiplex. The API will soon support this
at which point this section will be expanded.</para>
</section>
<section id="DTV_ENUM_DELSYS">
<title><constant>DTV_ENUM_DELSYS</constant></title>
<para>A Multi standard frontend needs to advertise the delivery systems provided.
Applications need to enumerate the provided delivery systems, before using
any other operation with the frontend. Prior to it's introduction,
FE_GET_INFO was used to determine a frontend type. A frontend which
provides more than a single delivery system, FE_GET_INFO doesn't help much.
Applications which intends to use a multistandard frontend must enumerate
the delivery systems associated with it, rather than trying to use
FE_GET_INFO. In the case of a legacy frontend, the result is just the same
as with FE_GET_INFO, but in a more structured format </para>
</section>
</section>
<section id="frontend-property-terrestrial-systems">
<title>Properties used on terrestrial delivery systems</title>
@@ -767,7 +781,8 @@ typedef enum fe_hierarchy {
<title>Properties used on cable delivery systems</title>
<section id="dvbc-params">
<title>DVB-C delivery system</title>
<para>The DVB-C Annex-A/C is the widely used cable standard. Transmission uses QAM modulation.</para>
<para>The DVB-C Annex-A is the widely used cable standard. Transmission uses QAM modulation.</para>
<para>The DVB-C Annex-C is optimized for 6MHz, and is used in Japan. It supports a subset of the Annex A modulation types, and a roll-off of 0.13, instead of 0.15</para>
<para>The following parameters are valid for DVB-C Annex A/C:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>

8
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@@ -45,8 +45,8 @@ transmission. The fontend types are given by fe_type_t type, defined as:</para>
</row>
<row>
<entry id="FE_QAM"><constant>FE_QAM</constant></entry>
<entry>For DVB-C annex A/C standard</entry>
<entry><constant>SYS_DVBC_ANNEX_AC</constant></entry>
<entry>For DVB-C annex A standard</entry>
<entry><constant>SYS_DVBC_ANNEX_A</constant></entry>
</row>
<row>
<entry id="FE_OFDM"><constant>FE_OFDM</constant></entry>
@@ -63,6 +63,10 @@ transmission. The fontend types are given by fe_type_t type, defined as:</para>
<para>Newer formats like DVB-S2, ISDB-T, ISDB-S and DVB-T2 are not described at the above, as they're
supported via the new <link linkend="FE_GET_SET_PROPERTY">FE_GET_PROPERTY/FE_GET_SET_PROPERTY</link> ioctl's, using the <link linkend="DTV-DELIVERY-SYSTEM">DTV_DELIVERY_SYSTEM</link> parameter.
</para>
<para>The usage of this field is deprecated, as it doesn't report all supported standards, and
will provide an incomplete information for frontends that support multiple delivery systems.
Please use <link linkend="DTV_ENUM_DELSYS">DTV_ENUM_DELSYS</link> instead.</para>
</section>
<section id="fe-caps-t">

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DWy27mOq45dif1K1P0DPslYWbf3VKPXya3uKQ6rt9osMANCDrQ/7qPmhJr3u17uK8b3bnGo/j94F
0Op5BVDSZZqmafObLpdNH55rQcJrBcrWx83HLv/19ak+/Pc+Qn7rdqfc19flbA1+UuwLAGz9rt3R
baFkx/J3H/F+lD59/wPA6T5+96Muv/87pj9VZM6iFGn93mXU8uQGv8gAAAAALShSWQQAcITKokY6
liqLAKA6eyqLfmg2AADoj2kCANhLWAQAAB0SBgGwl7BohV9kAAAAgJEIi1YIgwAAAICRCIsAAMji
Y6VCGwCo01+aAAAAAIA7lUUAACR10QQA0PZ3+TRN0+Y3XXQBAIDydnRbKNmx1EcEgC76UyqLAAAo
1vkEAOq3KyzSEQAAAADokwmuAQAAAHgQFgEAAADwICwCAAAA4EFYBAAAAMCDsAgAAACAB2ERAAAA
AA/CIgAAAAAehEUAAAAAPAiLAAAAAHgQFgEAAADwICwCAAAA4EFYBAAAAMCDsAgAAACAB2ERAAAA
AA/CIgAAAAAehEUAAAAAPAiLAAAAAHgQFgEAAADwICwCAAAA4EFYBAAAAMCDsAgAAACAB2ERAAAA
AA/CIgAAAAAe/g/10lQlA3JSSwAAAABJRU5ErkJggg==

8
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@@ -178,11 +178,3 @@ in the frequency range from 87,5 to 108,0 MHz</title>
</biblioentry>
</bibliography>
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10
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@@ -1168,6 +1168,8 @@ dheight = format.fmt.pix.height;
</section>
</section>
&sub-selection-api;
<section id="streaming-par">
<title>Streaming Parameters</title>
@@ -1195,11 +1197,3 @@ separate parameters for input and output devices.</para>
<para>These ioctls are optional, drivers need not implement
them. If so, they return the &EINVAL;.</para>
</section>
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30
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@@ -1082,7 +1082,7 @@ until the time in the timestamp field has arrived. I would like to
follow SGI's lead, and adopt a multimedia timestamping system like
their UST (Unadjusted System Time). See
http://web.archive.org/web/*/http://reality.sgi.com
/cpirazzi_engr/lg/time/intro.html.
/cpirazzi_engr/lg/time/intro.html.
UST uses timestamps that are 64-bit signed integers
(not struct timeval's) and given in nanosecond units. The UST clock
starts at zero when the system is booted and runs continuously and
@@ -2376,6 +2376,23 @@ that used it. It was originally scheduled for removal in 2.6.35.
<listitem>
<para>V4L2_CTRL_FLAG_VOLATILE was added to signal volatile controls to userspace.</para>
</listitem>
<listitem>
<para>Add selection API for extended control over cropping and
composing. Does not affect the compatibility of current drivers and
applications. See <link linkend="selection-api"> selection API </link> for
details.</para>
</listitem>
</orderedlist>
</section>
<section>
<title>V4L2 in Linux 3.3</title>
<orderedlist>
<listitem>
<para>Added <constant>V4L2_CID_ALPHA_COMPONENT</constant> control
to the <link linkend="control">User controls class</link>.
</para>
</listitem>
</orderedlist>
</section>
@@ -2489,6 +2506,9 @@ ioctls.</para>
<listitem>
<para>&VIDIOC-CREATE-BUFS; and &VIDIOC-PREPARE-BUF; ioctls.</para>
</listitem>
<listitem>
<para>Selection API. <xref linkend="selection-api" /></para>
</listitem>
</itemizedlist>
</section>
@@ -2507,11 +2527,3 @@ interfaces and should not be implemented in new drivers.</para>
</itemizedlist>
</section>
</section>
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43
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@@ -323,12 +323,6 @@ minimum value disables backlight compensation.</entry>
<entry>Switch on or off the illuminator 1 or 2 of the device
(usually a microscope).</entry>
</row>
<row>
<entry><constant>V4L2_CID_LASTP1</constant></entry>
<entry></entry>
<entry>End of the predefined control IDs (currently
<constant>V4L2_CID_ILLUMINATORS_2</constant> + 1).</entry>
</row>
<row>
<entry><constant>V4L2_CID_MIN_BUFFERS_FOR_CAPTURE</constant></entry>
<entry>integer</entry>
@@ -345,6 +339,25 @@ and used as a hint to determine the number of OUTPUT buffers to pass to REQBUFS.
The value is the minimum number of OUTPUT buffers that is necessary for hardware
to work.</entry>
</row>
<row id="v4l2-alpha-component">
<entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry>
<entry>integer</entry>
<entry> Sets the alpha color component on the capture device or on
the capture buffer queue of a mem-to-mem device. When a mem-to-mem
device produces frame format that includes an alpha component
(e.g. <link linkend="rgb-formats">packed RGB image formats</link>)
and the alpha value is not defined by the mem-to-mem input data
this control lets you select the alpha component value of all
pixels. It is applicable to any pixel format that contains an alpha
component.
</entry>
</row>
<row>
<entry><constant>V4L2_CID_LASTP1</constant></entry>
<entry></entry>
<entry>End of the predefined control IDs (currently
<constant>V4L2_CID_ALPHA_COMPONENT</constant> + 1).</entry>
</row>
<row>
<entry><constant>V4L2_CID_PRIVATE_BASE</constant></entry>
<entry></entry>
@@ -3329,6 +3342,16 @@ interface and may change in the future.</para>
<entry>The short circuit protection of the flash
controller has been triggered.</entry>
</row>
<row>
<entry><constant>V4L2_FLASH_FAULT_OVER_CURRENT</constant></entry>
<entry>Current in the LED power supply has exceeded the limit
specific to the flash controller.</entry>
</row>
<row>
<entry><constant>V4L2_FLASH_FAULT_INDICATOR</constant></entry>
<entry>The flash controller has detected a short or open
circuit condition on the indicator LED.</entry>
</row>
</tbody>
</entrytbl>
</row>
@@ -3357,11 +3380,3 @@ interface and may change in the future.</para>
</section>
</section>
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8
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@@ -108,11 +108,3 @@ linkend="mmap">memory mapping</link> or <link
linkend="userp">user pointer</link>) I/O. See <xref
linkend="io" /> for details.</para>
</section>
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8
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@@ -16,11 +16,3 @@ Applications send data to be converted to the driver through a
I/O.</para>
<para>[to do]</para>
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8
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@@ -15,11 +15,3 @@ receive the result data either with &func-read; and &func-write;
functions, or through the streaming I/O mechanism.</para>
<para>[to do]</para>
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8
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@@ -41,11 +41,3 @@ intermediate step leading up to that information. See the documentation for the
event you want to subscribe to whether this is applicable for that event or not.</para>
</listitem>
</orderedlist></para>
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8
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@@ -154,11 +154,3 @@ data flow. For more information see <xref linkend="crop" />.</para>
however the framebuffer interface of the driver may support the
<constant>FBIOBLANK</constant> ioctl.</para>
</section>
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8
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@@ -104,11 +104,3 @@ linkend="mmap">memory mapping</link> or <link
linkend="userp">user pointer</link>) I/O. See <xref
linkend="io" /> for details.</para>
</section>
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8
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@@ -369,11 +369,3 @@ reasons. <!-- video4linux-list@redhat.com on 22 Oct 2002 subject
<para>To start or stop the frame buffer overlay applications call
the &VIDIOC-OVERLAY; ioctl.</para>
</section>
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8
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@@ -47,11 +47,3 @@ depending on the selected frequency. The &VIDIOC-G-TUNER; or
&VIDIOC-G-MODULATOR; ioctl
reports the supported frequency range.</para>
</section>
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8
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@@ -337,11 +337,3 @@ an &EBUSY; if the required hardware resources are temporarily
unavailable, for example the device is already in use by another
process.</para>
</section>
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16
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@@ -29,10 +29,10 @@ returned by the &VIDIOC-QUERYCAP; ioctl. Any tuner that supports RDS
will set the <constant>V4L2_TUNER_CAP_RDS</constant> flag in
the <structfield>capability</structfield> field of &v4l2-tuner;. If
the driver only passes RDS blocks without interpreting the data
the <constant>V4L2_TUNER_SUB_RDS_BLOCK_IO</constant> flag has to be
the <constant>V4L2_TUNER_CAP_RDS_BLOCK_IO</constant> flag has to be
set, see <link linkend="reading-rds-data">Reading RDS data</link>.
For future use the
flag <constant>V4L2_TUNER_SUB_RDS_CONTROLS</constant> has also been
flag <constant>V4L2_TUNER_CAP_RDS_CONTROLS</constant> has also been
defined. However, a driver for a radio tuner with this capability does
not yet exist, so if you are planning to write such a driver you
should discuss this on the linux-media mailing list: &v4l-ml;.</para>
@@ -52,9 +52,9 @@ field of &v4l2-modulator;.
In order to enable the RDS transmission one must set the <constant>V4L2_TUNER_SUB_RDS</constant>
bit in the <structfield>txsubchans</structfield> field of &v4l2-modulator;.
If the driver only passes RDS blocks without interpreting the data
the <constant>V4L2_TUNER_SUB_RDS_BLOCK_IO</constant> flag has to be set. If the
the <constant>V4L2_TUNER_CAP_RDS_BLOCK_IO</constant> flag has to be set. If the
tuner is capable of handling RDS entities like program identification codes and radio
text, the flag <constant>V4L2_TUNER_SUB_RDS_CONTROLS</constant> should be set,
text, the flag <constant>V4L2_TUNER_CAP_RDS_CONTROLS</constant> should be set,
see <link linkend="writing-rds-data">Writing RDS data</link> and
<link linkend="fm-tx-controls">FM Transmitter Control Reference</link>.</para>
</section>
@@ -194,11 +194,3 @@ as follows:</para>
</tgroup>
</table>
</section>
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9
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@@ -697,12 +697,3 @@ Sliced VBI services</link> for a description of the line payload.</entry>
</section>
</section>
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8
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@@ -27,11 +27,3 @@ kernel 2.6.37.</para>
<para>Modern devices all use the <link linkend="raw-vbi">raw</link> or
<link linkend="sliced">sliced</link> VBI API.</para>
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8
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@@ -198,11 +198,3 @@ devices with the videodev module.</para>
<para>to do</para>
</section>
-->
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8
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@@ -60,11 +60,3 @@ descriptor.</para>
</variablelist>
</refsect1>
</refentry>
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8
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@@ -69,11 +69,3 @@ their respective function and parameters are specified in <xref
the parameter remains unmodified.</para>
</refsect1>
</refentry>
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8
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@@ -181,11 +181,3 @@ complete the request.</para>
</variablelist>
</refsect1>
</refentry>
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8
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@@ -74,11 +74,3 @@ mapped yet.</para>
</variablelist>
</refsect1>
</refentry>
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8
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@@ -111,11 +111,3 @@ system has been reached.</para>
</variablelist>
</refsect1>
</refentry>
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8
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@@ -117,11 +117,3 @@ than <constant>OPEN_MAX</constant>.</para>
</variablelist>
</refsect1>
</refentry>
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@@ -179,11 +179,3 @@ type of device.</para>
</variablelist>
</refsect1>
</refentry>
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@@ -128,11 +128,3 @@ zero or greater than <constant>FD_SETSIZE</constant>.</para>
</variablelist>
</refsect1>
</refentry>
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@@ -126,11 +126,3 @@ type of device.</para>
</variablelist>
</refsect1>
</refentry>
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8
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@@ -1282,11 +1282,3 @@ line, top field first. The bottom field is transmitted first.</entry>
</mediaobject>
</figure>
</section>
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7
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@@ -158,10 +158,3 @@ still don't use libv4l.</para>
</section>
</section>
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@@ -60,11 +60,3 @@ pixel image</title>
</example>
</refsect1>
</refentry>
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8
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@@ -137,11 +137,3 @@ pixel image</title>
</example>
</refsect1>
</refentry>
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8
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@@ -141,11 +141,3 @@ pixel image</title>
</example>
</refsect1>
</refentry>
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8
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@@ -144,11 +144,3 @@ CbCr plane has as many pad bytes after its rows.</para>
</example>
</refsect1>
</refentry>
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8
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@@ -64,11 +64,3 @@ layout of macroblocks</title>
</example>
</refsect1>
</refentry>
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8
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@@ -164,11 +164,3 @@ pixel image</title>
</example>
</refsect1>
</refentry>
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15
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@@ -428,8 +428,11 @@ colorspace <constant>V4L2_COLORSPACE_SRGB</constant>.</para>
<para>Bit 7 is the most significant bit. The value of a = alpha
bits is undefined when reading from the driver, ignored when writing
to the driver, except when alpha blending has been negotiated for a
<link linkend="overlay">Video Overlay</link> or <link
linkend="osd">Video Output Overlay</link>.</para>
<link linkend="overlay">Video Overlay</link> or <link linkend="osd">
Video Output Overlay</link> or when alpha component has been configured
for a <link linkend="capture">Video Capture</link> by means of <link
linkend="v4l2-alpha-component"> <constant>V4L2_CID_ALPHA_COMPONENT
</constant> </link> control.</para>
<example>
<title><constant>V4L2_PIX_FMT_BGR24</constant> 4 &times; 4 pixel
@@ -930,11 +933,3 @@ See &v4l-dvb; for access instructions.</para>
</refsect1>
</refentry>
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@@ -234,11 +234,3 @@ linkend="osd">Video Output Overlay</link>.</para>
</refsect1>
</refentry>
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@@ -81,11 +81,3 @@ pixel image</title>
</example>
</refsect1>
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@@ -65,11 +65,3 @@ pixel image</title>
</example>
</refsect1>
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@@ -65,11 +65,3 @@ pixel image</title>
</example>
</refsect1>
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@@ -65,11 +65,3 @@ columns and rows.</para>
</example>
</refsect1>
</refentry>
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@@ -118,11 +118,3 @@ pixel image</title>
</example>
</refsect1>
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@@ -118,11 +118,3 @@ pixel image</title>
</example>
</refsect1>
</refentry>
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@@ -79,11 +79,3 @@ pixel image</title>
</example>
</refsect1>
</refentry>
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@@ -147,11 +147,3 @@ pixel image</title>
</example>
</refsect1>
</refentry>
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@@ -131,11 +131,3 @@ pixel image</title>
</example>
</refsect1>
</refentry>
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@@ -145,11 +145,3 @@ pixel image</title>
</example>
</refsect1>
</refentry>
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@@ -118,11 +118,3 @@ pixel image</title>
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@@ -118,11 +118,3 @@ pixel image</title>
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@@ -891,6 +891,11 @@ kernel sources in the file <filename>Documentation/video4linux/cx2341x/README.hm
<entry>'M310'</entry>
<entry>Compressed BGGR Bayer format used by the gspca driver.</entry>
</row>
<row id="V4L2-PIX-FMT-JL2005BCD">
<entry><constant>V4L2_PIX_FMT_JL2005BCD</constant></entry>
<entry>'JL20'</entry>
<entry>JPEG compressed RGGB Bayer format used by the gspca driver.</entry>
</row>
<row id="V4L2-PIX-FMT-OV511">
<entry><constant>V4L2_PIX_FMT_OV511</constant></entry>
<entry>'O511'</entry>
@@ -998,11 +1003,3 @@ the other bits are set to 0.</entry>
</tgroup>
</table>
</section>
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@@ -0,0 +1,321 @@
<section id="selection-api">
<title>Experimental API for cropping, composing and scaling</title>
<note>
<title>Experimental</title>
<para>This is an <link linkend="experimental">experimental</link>
interface and may change in the future.</para>
</note>
<section>
<title>Introduction</title>
<para>Some video capture devices can sample a subsection of a picture and
shrink or enlarge it to an image of arbitrary size. Next, the devices can
insert the image into larger one. Some video output devices can crop part of an
input image, scale it up or down and insert it at an arbitrary scan line and
horizontal offset into a video signal. We call these abilities cropping,
scaling and composing.</para>
<para>On a video <emphasis>capture</emphasis> device the source is a video
signal, and the cropping target determine the area actually sampled. The sink
is an image stored in a memory buffer. The composing area specifies which part
of the buffer is actually written to by the hardware. </para>
<para>On a video <emphasis>output</emphasis> device the source is an image in a
memory buffer, and the cropping target is a part of an image to be shown on a
display. The sink is the display or the graphics screen. The application may
select the part of display where the image should be displayed. The size and
position of such a window is controlled by the compose target.</para>
<para>Rectangles for all cropping and composing targets are defined even if the
device does supports neither cropping nor composing. Their size and position
will be fixed in such a case. If the device does not support scaling then the
cropping and composing rectangles have the same size.</para>
</section>
<section>
<title>Selection targets</title>
<figure id="sel-targets-capture">
<title>Cropping and composing targets</title>
<mediaobject>
<imageobject>
<imagedata fileref="selection.png" format="PNG" />
</imageobject>
<textobject>
<phrase>Targets used by a cropping, composing and scaling
process</phrase>
</textobject>
</mediaobject>
</figure>
</section>
<section>
<title>Configuration</title>
<para>Applications can use the <link linkend="vidioc-g-selection">selection
API</link> to select an area in a video signal or a buffer, and to query for
default settings and hardware limits.</para>
<para>Video hardware can have various cropping, composing and scaling
limitations. It may only scale up or down, support only discrete scaling
factors, or have different scaling abilities in the horizontal and vertical
directions. Also it may not support scaling at all. At the same time the
cropping/composing rectangles may have to be aligned, and both the source and
the sink may have arbitrary upper and lower size limits. Therefore, as usual,
drivers are expected to adjust the requested parameters and return the actual
values selected. An application can control the rounding behaviour using <link
linkend="v4l2-sel-flags"> constraint flags </link>.</para>
<section>
<title>Configuration of video capture</title>
<para>See figure <xref linkend="sel-targets-capture" /> for examples of the
selection targets available for a video capture device. It is recommended to
configure the cropping targets before to the composing targets.</para>
<para>The range of coordinates of the top left corner, width and height of
areas that can be sampled is given by the <constant> V4L2_SEL_TGT_CROP_BOUNDS
</constant> target. It is recommended for the driver developers to put the
top/left corner at position <constant> (0,0) </constant>. The rectangle's
coordinates are expressed in pixels.</para>
<para>The top left corner, width and height of the source rectangle, that is
the area actually sampled, is given by the <constant> V4L2_SEL_TGT_CROP_ACTIVE
</constant> target. It uses the same coordinate system as <constant>
V4L2_SEL_TGT_CROP_BOUNDS </constant>. The active cropping area must lie
completely inside the capture boundaries. The driver may further adjust the
requested size and/or position according to hardware limitations.</para>
<para>Each capture device has a default source rectangle, given by the
<constant> V4L2_SEL_TGT_CROP_DEFAULT </constant> target. This rectangle shall
over what the driver writer considers the complete picture. Drivers shall set
the active crop rectangle to the default when the driver is first loaded, but
not later.</para>
<para>The composing targets refer to a memory buffer. The limits of composing
coordinates are obtained using <constant> V4L2_SEL_TGT_COMPOSE_BOUNDS
</constant>. All coordinates are expressed in pixels. The rectangle's top/left
corner must be located at position <constant> (0,0) </constant>. The width and
height are equal to the image size set by <constant> VIDIOC_S_FMT </constant>.
</para>
<para>The part of a buffer into which the image is inserted by the hardware is
controlled by the <constant> V4L2_SEL_TGT_COMPOSE_ACTIVE </constant> target.
The rectangle's coordinates are also expressed in the same coordinate system as
the bounds rectangle. The composing rectangle must lie completely inside bounds
rectangle. The driver must adjust the composing rectangle to fit to the
bounding limits. Moreover, the driver can perform other adjustments according
to hardware limitations. The application can control rounding behaviour using
<link linkend="v4l2-sel-flags"> constraint flags </link>.</para>
<para>For capture devices the default composing rectangle is queried using
<constant> V4L2_SEL_TGT_COMPOSE_DEFAULT </constant>. It is usually equal to the
bounding rectangle.</para>
<para>The part of a buffer that is modified by the hardware is given by
<constant> V4L2_SEL_TGT_COMPOSE_PADDED </constant>. It contains all pixels
defined using <constant> V4L2_SEL_TGT_COMPOSE_ACTIVE </constant> plus all
padding data modified by hardware during insertion process. All pixels outside
this rectangle <emphasis>must not</emphasis> be changed by the hardware. The
content of pixels that lie inside the padded area but outside active area is
undefined. The application can use the padded and active rectangles to detect
where the rubbish pixels are located and remove them if needed.</para>
</section>
<section>
<title>Configuration of video output</title>
<para>For output devices targets and ioctls are used similarly to the video
capture case. The <emphasis> composing </emphasis> rectangle refers to the
insertion of an image into a video signal. The cropping rectangles refer to a
memory buffer. It is recommended to configure the composing targets before to
the cropping targets.</para>
<para>The cropping targets refer to the memory buffer that contains an image to
be inserted into a video signal or graphical screen. The limits of cropping
coordinates are obtained using <constant> V4L2_SEL_TGT_CROP_BOUNDS </constant>.
All coordinates are expressed in pixels. The top/left corner is always point
<constant> (0,0) </constant>. The width and height is equal to the image size
specified using <constant> VIDIOC_S_FMT </constant> ioctl.</para>
<para>The top left corner, width and height of the source rectangle, that is
the area from which image date are processed by the hardware, is given by the
<constant> V4L2_SEL_TGT_CROP_ACTIVE </constant>. Its coordinates are expressed
in in the same coordinate system as the bounds rectangle. The active cropping
area must lie completely inside the crop boundaries and the driver may further
adjust the requested size and/or position according to hardware
limitations.</para>
<para>For output devices the default cropping rectangle is queried using
<constant> V4L2_SEL_TGT_CROP_DEFAULT </constant>. It is usually equal to the
bounding rectangle.</para>
<para>The part of a video signal or graphics display where the image is
inserted by the hardware is controlled by <constant>
V4L2_SEL_TGT_COMPOSE_ACTIVE </constant> target. The rectangle's coordinates
are expressed in pixels. The composing rectangle must lie completely inside the
bounds rectangle. The driver must adjust the area to fit to the bounding
limits. Moreover, the driver can perform other adjustments according to
hardware limitations. </para>
<para>The device has a default composing rectangle, given by the <constant>
V4L2_SEL_TGT_COMPOSE_DEFAULT </constant> target. This rectangle shall cover what
the driver writer considers the complete picture. It is recommended for the
driver developers to put the top/left corner at position <constant> (0,0)
</constant>. Drivers shall set the active composing rectangle to the default
one when the driver is first loaded.</para>
<para>The devices may introduce additional content to video signal other than
an image from memory buffers. It includes borders around an image. However,
such a padded area is driver-dependent feature not covered by this document.
Driver developers are encouraged to keep padded rectangle equal to active one.
The padded target is accessed by the <constant> V4L2_SEL_TGT_COMPOSE_PADDED
</constant> identifier. It must contain all pixels from the <constant>
V4L2_SEL_TGT_COMPOSE_ACTIVE </constant> target.</para>
</section>
<section>
<title>Scaling control.</title>
<para>An application can detect if scaling is performed by comparing the width
and the height of rectangles obtained using <constant> V4L2_SEL_TGT_CROP_ACTIVE
</constant> and <constant> V4L2_SEL_TGT_COMPOSE_ACTIVE </constant> targets. If
these are not equal then the scaling is applied. The application can compute
the scaling ratios using these values.</para>
</section>
</section>
<section>
<title>Comparison with old cropping API.</title>
<para>The selection API was introduced to cope with deficiencies of previous
<link linkend="crop"> API </link>, that was designed to control simple capture
devices. Later the cropping API was adopted by video output drivers. The ioctls
are used to select a part of the display were the video signal is inserted. It
should be considered as an API abuse because the described operation is
actually the composing. The selection API makes a clear distinction between
composing and cropping operations by setting the appropriate targets. The V4L2
API lacks any support for composing to and cropping from an image inside a
memory buffer. The application could configure a capture device to fill only a
part of an image by abusing V4L2 API. Cropping a smaller image from a larger
one is achieved by setting the field <structfield>
&v4l2-pix-format;::bytesperline </structfield>. Introducing an image offsets
could be done by modifying field <structfield> &v4l2-buffer;::m:userptr
</structfield> before calling <constant> VIDIOC_QBUF </constant>. Those
operations should be avoided because they are not portable (endianness), and do
not work for macroblock and Bayer formats and mmap buffers. The selection API
deals with configuration of buffer cropping/composing in a clear, intuitive and
portable way. Next, with the selection API the concepts of the padded target
and constraints flags are introduced. Finally, <structname> &v4l2-crop;
</structname> and <structname> &v4l2-cropcap; </structname> have no reserved
fields. Therefore there is no way to extend their functionality. The new
<structname> &v4l2-selection; </structname> provides a lot of place for future
extensions. Driver developers are encouraged to implement only selection API.
The former cropping API would be simulated using the new one. </para>
</section>
<section>
<title>Examples</title>
<example>
<title>Resetting the cropping parameters</title>
<para>(A video capture device is assumed; change <constant>
V4L2_BUF_TYPE_VIDEO_CAPTURE </constant> for other devices; change target to
<constant> V4L2_SEL_TGT_COMPOSE_* </constant> family to configure composing
area)</para>
<programlisting>
&v4l2-selection; sel = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.target = V4L2_SEL_TGT_CROP_DEFAULT,
};
ret = ioctl(fd, &VIDIOC-G-SELECTION;, &amp;sel);
if (ret)
exit(-1);
sel.target = V4L2_SEL_TGT_CROP_ACTIVE;
ret = ioctl(fd, &VIDIOC-S-SELECTION;, &amp;sel);
if (ret)
exit(-1);
</programlisting>
</example>
<example>
<title>Simple downscaling</title>
<para>Setting a composing area on output of size of <emphasis> at most
</emphasis> half of limit placed at a center of a display.</para>
<programlisting>
&v4l2-selection; sel = {
.type = V4L2_BUF_TYPE_VIDEO_OUTPUT,
.target = V4L2_SEL_TGT_COMPOSE_BOUNDS,
};
struct v4l2_rect r;
ret = ioctl(fd, &VIDIOC-G-SELECTION;, &amp;sel);
if (ret)
exit(-1);
/* setting smaller compose rectangle */
r.width = sel.r.width / 2;
r.height = sel.r.height / 2;
r.left = sel.r.width / 4;
r.top = sel.r.height / 4;
sel.r = r;
sel.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
sel.flags = V4L2_SEL_FLAG_LE;
ret = ioctl(fd, &VIDIOC-S-SELECTION;, &amp;sel);
if (ret)
exit(-1);
</programlisting>
</example>
<example>
<title>Querying for scaling factors</title>
<para>A video output device is assumed; change <constant>
V4L2_BUF_TYPE_VIDEO_OUTPUT </constant> for other devices</para>
<programlisting>
&v4l2-selection; compose = {
.type = V4L2_BUF_TYPE_VIDEO_OUTPUT,
.target = V4L2_SEL_TGT_COMPOSE_ACTIVE,
};
&v4l2-selection; crop = {
.type = V4L2_BUF_TYPE_VIDEO_OUTPUT,
.target = V4L2_SEL_TGT_CROP_ACTIVE,
};
double hscale, vscale;
ret = ioctl(fd, &VIDIOC-G-SELECTION;, &amp;compose);
if (ret)
exit(-1);
ret = ioctl(fd, &VIDIOC-G-SELECTION;, &amp;crop);
if (ret)
exit(-1);
/* computing scaling factors */
hscale = (double)compose.r.width / crop.r.width;
vscale = (double)compose.r.height / crop.r.height;
</programlisting>
</example>
</section>
</section>

1
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@@ -501,6 +501,7 @@ and discussions on the V4L mailing list.</revremark>
&sub-g-output;
&sub-g-parm;
&sub-g-priority;
&sub-g-selection;
&sub-g-sliced-vbi-cap;
&sub-g-std;
&sub-g-tuner;

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@@ -228,11 +228,3 @@ is out of bounds.</para>
</variablelist>
</refsect1>
</refentry>
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@@ -196,11 +196,3 @@ is out of bounds.</para>
</variablelist>
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@@ -381,11 +381,3 @@ is out of bounds.</para>
</variablelist>
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@@ -127,11 +127,3 @@ this control belongs to.</para>
</variablelist>
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@@ -312,10 +312,3 @@ to store the payload and this error code is returned.</para>
</refsect1>
</refentry>
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@@ -295,7 +295,8 @@ set this field to zero.</entry>
<entry>The device is capable of non-destructive overlays.
When the driver clears this flag, only destructive overlays are
supported. There are no drivers yet which support both destructive and
non-destructive overlays.</entry>
non-destructive overlays. Video Output Overlays are in practice always
non-destructive.</entry>
</row>
<row>
<entry><constant>V4L2_FBUF_CAP_CHROMAKEY</constant></entry>
@@ -339,8 +340,8 @@ blending makes no sense for destructive overlays.</entry>
<row>
<entry><constant>V4L2_FBUF_CAP_SRC_CHROMAKEY</constant></entry>
<entry>0x0080</entry>
<entry>The device supports Source Chroma-keying. Framebuffer pixels
with the chroma-key colors are replaced by video pixels, which is exactly opposite of
<entry>The device supports Source Chroma-keying. Video pixels
with the chroma-key colors are replaced by framebuffer pixels, which is exactly opposite of
<constant>V4L2_FBUF_CAP_CHROMAKEY</constant></entry>
</row>
</tbody>
@@ -356,7 +357,9 @@ with the chroma-key colors are replaced by video pixels, which is exactly opposi
<entry><constant>V4L2_FBUF_FLAG_PRIMARY</constant></entry>
<entry>0x0001</entry>
<entry>The framebuffer is the primary graphics surface.
In other words, the overlay is destructive. [?]</entry>
In other words, the overlay is destructive. This flag is typically set by any
driver that doesn't have the <constant>V4L2_FBUF_CAP_EXTERNOVERLAY</constant>
capability and it is cleared otherwise.</entry>
</row>
<row>
<entry><constant>V4L2_FBUF_FLAG_OVERLAY</constant></entry>
@@ -366,9 +369,8 @@ size as the capture. [?]</entry>
</row>
<row>
<entry spanname="hspan">The purpose of
<constant>V4L2_FBUF_FLAG_PRIMARY</constant> and
<constant>V4L2_FBUF_FLAG_OVERLAY</constant> was never quite clear.
Most drivers seem to ignore these flags. For compatibility with the
Most drivers seem to ignore this flag. For compatibility with the
<wordasword>bttv</wordasword> driver applications should set the
<constant>V4L2_FBUF_FLAG_OVERLAY</constant> flag.</entry>
</row>

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</variablelist>
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@@ -0,0 +1,304 @@
<refentry id="vidioc-g-selection">
<refmeta>
<refentrytitle>ioctl VIDIOC_G_SELECTION, VIDIOC_S_SELECTION</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
<refname>VIDIOC_G_SELECTION</refname>
<refname>VIDIOC_S_SELECTION</refname>
<refpurpose>Get or set one of the selection rectangles</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>int <function>ioctl</function></funcdef>
<paramdef>int <parameter>fd</parameter></paramdef>
<paramdef>int <parameter>request</parameter></paramdef>
<paramdef>struct v4l2_selection *<parameter>argp</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term><parameter>fd</parameter></term>
<listitem>
<para>&fd;</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>request</parameter></term>
<listitem>
<para>VIDIOC_G_SELECTION, VIDIOC_S_SELECTION</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>argp</parameter></term>
<listitem>
<para></para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Description</title>
<note>
<title>Experimental</title>
<para>This is an <link linkend="experimental"> experimental </link>
interface and may change in the future.</para>
</note>
<para>The ioctls are used to query and configure selection rectangles.</para>
<para> To query the cropping (composing) rectangle set <structfield>
&v4l2-selection;::type </structfield> to the respective buffer type. Do not
use multiplanar buffers. Use <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE
</constant> instead of <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE
</constant>. Use <constant> V4L2_BUF_TYPE_VIDEO_OUTPUT </constant> instead of
<constant> V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE </constant>. The next step is
setting <structfield> &v4l2-selection;::target </structfield> to value
<constant> V4L2_SEL_TGT_CROP_ACTIVE </constant> (<constant>
V4L2_SEL_TGT_COMPOSE_ACTIVE </constant>). Please refer to table <xref
linkend="v4l2-sel-target" /> or <xref linkend="selection-api" /> for additional
targets. Fields <structfield> &v4l2-selection;::flags </structfield> and
<structfield> &v4l2-selection;::reserved </structfield> are ignored and they
must be filled with zeros. The driver fills the rest of the structure or
returns &EINVAL; if incorrect buffer type or target was used. If cropping
(composing) is not supported then the active rectangle is not mutable and it is
always equal to the bounds rectangle. Finally, structure <structfield>
&v4l2-selection;::r </structfield> is filled with the current cropping
(composing) coordinates. The coordinates are expressed in driver-dependent
units. The only exception are rectangles for images in raw formats, whose
coordinates are always expressed in pixels. </para>
<para> To change the cropping (composing) rectangle set <structfield>
&v4l2-selection;::type </structfield> to the respective buffer type. Do not
use multiplanar buffers. Use <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE
</constant> instead of <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE
</constant>. Use <constant> V4L2_BUF_TYPE_VIDEO_OUTPUT </constant> instead of
<constant> V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE </constant>. The next step is
setting <structfield> &v4l2-selection;::target </structfield> to value
<constant> V4L2_SEL_TGT_CROP_ACTIVE </constant> (<constant>
V4L2_SEL_TGT_COMPOSE_ACTIVE </constant>). Please refer to table <xref
linkend="v4l2-sel-target" /> or <xref linkend="selection-api" /> for additional
targets. Set desired active area into the field <structfield>
&v4l2-selection;::r </structfield>. Field <structfield>
&v4l2-selection;::reserved </structfield> is ignored and must be filled with
zeros. The driver may adjust the rectangle coordinates. An application may
introduce constraints to control rounding behaviour. Set the field
<structfield> &v4l2-selection;::flags </structfield> to one of values:
<itemizedlist>
<listitem>
<para><constant>0</constant> - The driver can adjust the rectangle size freely
and shall choose a crop/compose rectangle as close as possible to the requested
one.</para>
</listitem>
<listitem>
<para><constant>V4L2_SEL_FLAG_GE</constant> - The driver is not allowed to
shrink the rectangle. The original rectangle must lay inside the adjusted
one.</para>
</listitem>
<listitem>
<para><constant>V4L2_SEL_FLAG_LE</constant> - The driver is not allowed to
enlarge the rectangle. The adjusted rectangle must lay inside the original
one.</para>
</listitem>
<listitem>
<para><constant>V4L2_SEL_FLAG_GE | V4L2_SEL_FLAG_LE</constant> - The driver
must choose the size exactly the same as in the requested rectangle.</para>
</listitem>
</itemizedlist>
Please refer to <xref linkend="sel-const-adjust" />.
</para>
<para> The driver may have to adjusts the requested dimensions against hardware
limits and other parts as the pipeline, i.e. the bounds given by the
capture/output window or TV display. The closest possible values of horizontal
and vertical offset and sizes are chosen according to following priority:
<orderedlist>
<listitem>
<para>Satisfy constraints from <structfield>&v4l2-selection;::flags</structfield>.</para>
</listitem>
<listitem>
<para>Adjust width, height, left, and top to hardware limits and alignments.</para>
</listitem>
<listitem>
<para>Keep center of adjusted rectangle as close as possible to the original one.</para>
</listitem>
<listitem>
<para>Keep width and height as close as possible to original ones.</para>
</listitem>
<listitem>
<para>Keep horizontal and vertical offset as close as possible to original ones.</para>
</listitem>
</orderedlist>
On success the field <structfield> &v4l2-selection;::r </structfield> contains
the adjusted rectangle. When the parameters are unsuitable the application may
modify the cropping (composing) or image parameters and repeat the cycle until
satisfactory parameters have been negotiated. If constraints flags have to be
violated at then ERANGE is returned. The error indicates that <emphasis> there
exist no rectangle </emphasis> that satisfies the constraints.</para>
</refsect1>
<refsect1>
<table frame="none" pgwide="1" id="v4l2-sel-target">
<title>Selection targets.</title>
<tgroup cols="3">
&cs-def;
<tbody valign="top">
<row>
<entry><constant>V4L2_SEL_TGT_CROP_ACTIVE</constant></entry>
<entry>0</entry>
<entry>area that is currently cropped by hardware</entry>
</row>
<row>
<entry><constant>V4L2_SEL_TGT_CROP_DEFAULT</constant></entry>
<entry>1</entry>
<entry>suggested cropping rectangle that covers the "whole picture"</entry>
</row>
<row>
<entry><constant>V4L2_SEL_TGT_CROP_BOUNDS</constant></entry>
<entry>2</entry>
<entry>limits for the cropping rectangle</entry>
</row>
<row>
<entry><constant>V4L2_SEL_TGT_COMPOSE_ACTIVE</constant></entry>
<entry>256</entry>
<entry>area to which data are composed by hardware</entry>
</row>
<row>
<entry><constant>V4L2_SEL_TGT_COMPOSE_DEFAULT</constant></entry>
<entry>257</entry>
<entry>suggested composing rectangle that covers the "whole picture"</entry>
</row>
<row>
<entry><constant>V4L2_SEL_TGT_COMPOSE_BOUNDS</constant></entry>
<entry>258</entry>
<entry>limits for the composing rectangle</entry>
</row>
<row>
<entry><constant>V4L2_SEL_TGT_COMPOSE_PADDED</constant></entry>
<entry>259</entry>
<entry>the active area and all padding pixels that are inserted or modified by the hardware</entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1>
<refsect1>
<table frame="none" pgwide="1" id="v4l2-sel-flags">
<title>Selection constraint flags</title>
<tgroup cols="3">
&cs-def;
<tbody valign="top">
<row>
<entry><constant>V4L2_SEL_FLAG_GE</constant></entry>
<entry>0x00000001</entry>
<entry>indicate that adjusted rectangle must contain a rectangle from <structfield>&v4l2-selection;::r</structfield></entry>
</row>
<row>
<entry><constant>V4L2_SEL_FLAG_LE</constant></entry>
<entry>0x00000002</entry>
<entry>indicate that adjusted rectangle must be inside a rectangle from <structfield>&v4l2-selection;::r</structfield></entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1>
<section>
<figure id="sel-const-adjust">
<title>Size adjustments with constraint flags.</title>
<mediaobject>
<imageobject>
<imagedata fileref="constraints.png" format="PNG" />
</imageobject>
<textobject>
<phrase>Behaviour of rectangle adjustment for different constraint
flags.</phrase>
</textobject>
</mediaobject>
</figure>
</section>
<refsect1>
<table pgwide="1" frame="none" id="v4l2-selection">
<title>struct <structname>v4l2_selection</structname></title>
<tgroup cols="3">
&cs-str;
<tbody valign="top">
<row>
<entry>__u32</entry>
<entry><structfield>type</structfield></entry>
<entry>Type of the buffer (from &v4l2-buf-type;)</entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>target</structfield></entry>
<entry>used to select between <link linkend="v4l2-sel-target"> cropping and composing rectangles </link></entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>flags</structfield></entry>
<entry>control over coordinates adjustments, refer to <link linkend="v4l2-sel-flags">selection flags</link></entry>
</row>
<row>
<entry>&v4l2-rect;</entry>
<entry><structfield>r</structfield></entry>
<entry>selection rectangle</entry>
</row>
<row>
<entry>__u32</entry>
<entry><structfield>reserved[9]</structfield></entry>
<entry>Reserved fields for future use</entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1>
<refsect1>
&return-value;
<variablelist>
<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
<para>The buffer <structfield> &v4l2-selection;::type </structfield>
or <structfield> &v4l2-selection;::target </structfield> is not supported, or
the <structfield> &v4l2-selection;::flags </structfield> are invalid.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><errorcode>ERANGE</errorcode></term>
<listitem>
<para>it is not possible to adjust a rectangle <structfield>
&v4l2-selection;::r </structfield> that satisfies all contraints from
<structfield> &v4l2-selection;::flags </structfield>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><errorcode>EBUSY</errorcode></term>
<listitem>
<para>it is not possible to apply change of selection rectangle at the moment.
Usually because streaming is in progress.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>

8
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View File

@@ -88,11 +88,3 @@ standards.</para>
</variablelist>
</refsect1>
</refentry>
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@@ -318,6 +318,16 @@ standard.</para><!-- FIXME what if PAL+NTSC and Bi but not SAP? --></entry>
<entry>RDS capture is supported. This capability is only valid for
radio tuners.</entry>
</row>
<row>
<entry><constant>V4L2_TUNER_CAP_RDS_BLOCK_IO</constant></entry>
<entry>0x0100</entry>
<entry>The RDS data is passed as unparsed RDS blocks.</entry>
</row>
<row>
<entry><constant>V4L2_TUNER_CAP_RDS_CONTROLS</constant></entry>
<entry>0x0200</entry>
<entry>The RDS data is parsed by the hardware and set via controls.</entry>
</row>
</tbody>
</tgroup>
</table>
@@ -525,11 +535,3 @@ out of bounds.</para>
</variablelist>
</refsect1>
</refentry>
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@@ -100,11 +100,3 @@ supported, or the <structfield>index</structfield> is out of bounds.</para>
</variablelist>
</refsect1>
</refentry>
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@@ -443,11 +443,3 @@ or this particular menu item is not supported by the driver.</para>
</variablelist>
</refsect1>
</refentry>
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8
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@@ -125,11 +125,3 @@ wrong.</para>
</variablelist>
</refsect1>
</refentry>
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