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r: 295286
b: refs/heads/master
c: 2fb9e96
h: refs/heads/master
v: v3
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Linus Torvalds committed Mar 24, 2012
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2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 29a2e2836ff9ea65a603c89df217f4198973a74f
refs/heads/master: 2fb9e96cada81e7288579e14c3d56f1f969354a5
2 changes: 2 additions & 0 deletions trunk/Documentation/00-INDEX
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Expand Up @@ -104,6 +104,8 @@ cpuidle/
- info on CPU_IDLE, CPU idle state management subsystem.
cputopology.txt
- documentation on how CPU topology info is exported via sysfs.
crc32.txt
- brief tutorial on CRC computation
cris/
- directory with info about Linux on CRIS architecture.
crypto/
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11 changes: 0 additions & 11 deletions trunk/Documentation/ABI/testing/sysfs-kernel-mm-cleancache
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17 changes: 17 additions & 0 deletions trunk/Documentation/DocBook/kgdb.tmpl
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Expand Up @@ -361,6 +361,23 @@
<para>It is possible to use this option with kgdboc on a tty that is not a system console.
</para>
</para>
</sect1>
<sect1 id="kgdbreboot">
<title>Run time parameter: kgdbreboot</title>
<para> The kgdbreboot feature allows you to change how the debugger
deals with the reboot notification. You have 3 choices for the
behavior. The default behavior is always set to 0.</para>
<orderedlist>
<listitem><para>echo -1 > /sys/module/debug_core/parameters/kgdbreboot</para>
<para>Ignore the reboot notification entirely.</para>
</listitem>
<listitem><para>echo 0 > /sys/module/debug_core/parameters/kgdbreboot</para>
<para>Send the detach message to any attached debugger client.</para>
</listitem>
<listitem><para>echo 1 > /sys/module/debug_core/parameters/kgdbreboot</para>
<para>Enter the debugger on reboot notify.</para>
</listitem>
</orderedlist>
</sect1>
</chapter>
<chapter id="usingKDB">
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20 changes: 20 additions & 0 deletions trunk/Documentation/DocBook/media/v4l/biblio.xml
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Expand Up @@ -128,6 +128,26 @@ url="http://www.ijg.org">http://www.ijg.org</ulink>)</corpauthor>
<subtitle>Version 1.02</subtitle>
</biblioentry>

<biblioentry id="itu-t81">
<abbrev>ITU-T.81</abbrev>
<authorgroup>
<corpauthor>International Telecommunication Union
(<ulink url="http://www.itu.int">http://www.itu.int</ulink>)</corpauthor>
</authorgroup>
<title>ITU-T Recommendation T.81
"Information Technology &mdash; Digital Compression and Coding of Continous-Tone
Still Images &mdash; Requirements and Guidelines"</title>
</biblioentry>

<biblioentry id="w3c-jpeg-jfif">
<abbrev>W3C JPEG JFIF</abbrev>
<authorgroup>
<corpauthor>The World Wide Web Consortium (<ulink
url="http://www.w3.org/Graphics/JPEG">http://www.w3.org</ulink>)</corpauthor>
</authorgroup>
<title>JPEG JFIF</title>
</biblioentry>

<biblioentry id="smpte12m">
<abbrev>SMPTE&nbsp;12M</abbrev>
<authorgroup>
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14 changes: 14 additions & 0 deletions trunk/Documentation/DocBook/media/v4l/compat.xml
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Expand Up @@ -2393,6 +2393,20 @@ details.</para>
to the <link linkend="control">User controls class</link>.
</para>
</listitem>
<listitem>
<para>Added the device_caps field to struct v4l2_capabilities and added the new
V4L2_CAP_DEVICE_CAPS capability.</para>
</listitem>
</orderedlist>
</section>

<section>
<title>V4L2 in Linux 3.4</title>
<orderedlist>
<listitem>
<para>Added <link linkend="jpeg-controls">JPEG compression control
class</link>.</para>
</listitem>
</orderedlist>
</section>

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220 changes: 220 additions & 0 deletions trunk/Documentation/DocBook/media/v4l/controls.xml
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Expand Up @@ -1284,6 +1284,49 @@ values are:</entry>
capturing. This is not done by muting audio hardware, which can still
produce a slight hiss, but in the encoder itself, guaranteeing a fixed
and reproducible audio bitstream. 0 = unmuted, 1 = muted.</entry>
</row>
<row><entry></entry></row>
<row id="v4l2-mpeg-audio-dec-playback">
<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK</constant>&nbsp;</entry>
<entry>enum&nbsp;v4l2_mpeg_audio_dec_playback</entry>
</row><row><entry spanname="descr">Determines how monolingual audio should be played back.
Possible values are:</entry>
</row>
<row>
<entrytbl spanname="descr" cols="2">
<tbody valign="top">
<row>
<entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_AUTO</constant>&nbsp;</entry>
<entry>Automatically determines the best playback mode.</entry>
</row>
<row>
<entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_STEREO</constant>&nbsp;</entry>
<entry>Stereo playback.</entry>
</row>
<row>
<entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_LEFT</constant>&nbsp;</entry>
<entry>Left channel playback.</entry>
</row>
<row>
<entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_RIGHT</constant>&nbsp;</entry>
<entry>Right channel playback.</entry>
</row>
<row>
<entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_MONO</constant>&nbsp;</entry>
<entry>Mono playback.</entry>
</row>
<row>
<entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_SWAPPED_STEREO</constant>&nbsp;</entry>
<entry>Stereo playback with swapped left and right channels.</entry>
</row>
</tbody>
</entrytbl>
</row>
<row><entry></entry></row>
<row id="v4l2-mpeg-audio-dec-multilingual-playback">
<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK</constant>&nbsp;</entry>
<entry>enum&nbsp;v4l2_mpeg_audio_dec_playback</entry>
</row><row><entry spanname="descr">Determines how multilingual audio should be played back.</entry>
</row>
<row><entry></entry></row>
<row id="v4l2-mpeg-video-encoding">
Expand Down Expand Up @@ -1447,6 +1490,22 @@ of the video. The supplied 32-bit integer is interpreted as follows (bit
</tbody>
</entrytbl>
</row>
<row><entry></entry></row>
<row id="v4l2-mpeg-video-dec-pts">
<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_PTS</constant>&nbsp;</entry>
<entry>integer64</entry>
</row><row><entry spanname="descr">This read-only control returns the
33-bit video Presentation Time Stamp as defined in ITU T-REC-H.222.0 and ISO/IEC 13818-1 of
the currently displayed frame. This is the same PTS as is used in &VIDIOC-DECODER-CMD;.</entry>
</row>
<row><entry></entry></row>
<row id="v4l2-mpeg-video-dec-frame">
<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_FRAME</constant>&nbsp;</entry>
<entry>integer64</entry>
</row><row><entry spanname="descr">This read-only control returns the
frame counter of the frame that is currently displayed (decoded). This value is reset to 0 whenever
the decoder is started.</entry>
</row>


<row><entry></entry></row>
Expand Down Expand Up @@ -3377,6 +3436,167 @@ interface and may change in the future.</para>
</tbody>
</tgroup>
</table>
</section>

<section id="jpeg-controls">
<title>JPEG Control Reference</title>
<para>The JPEG class includes controls for common features of JPEG
encoders and decoders. Currently it includes features for codecs
implementing progressive baseline DCT compression process with
Huffman entrophy coding.</para>
<table pgwide="1" frame="none" id="jpeg-control-id">
<title>JPEG Control IDs</title>

<tgroup cols="4">
<colspec colname="c1" colwidth="1*" />
<colspec colname="c2" colwidth="6*" />
<colspec colname="c3" colwidth="2*" />
<colspec colname="c4" colwidth="6*" />
<spanspec namest="c1" nameend="c2" spanname="id" />
<spanspec namest="c2" nameend="c4" spanname="descr" />
<thead>
<row>
<entry spanname="id" align="left">ID</entry>
<entry align="left">Type</entry>
</row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
</row>
</thead>
<tbody valign="top">
<row><entry></entry></row>
<row>
<entry spanname="id"><constant>V4L2_CID_JPEG_CLASS</constant>&nbsp;</entry>
<entry>class</entry>
</row><row><entry spanname="descr">The JPEG class descriptor. Calling
&VIDIOC-QUERYCTRL; for this control will return a description of this
control class.

</entry>
</row>
<row>
<entry spanname="id"><constant>V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant></entry>
<entry>menu</entry>
</row>
<row id="jpeg-chroma-subsampling-control">
<entry spanname="descr">The chroma subsampling factors describe how
each component of an input image is sampled, in respect to maximum
sample rate in each spatial dimension. See <xref linkend="itu-t81"/>,
clause A.1.1. for more details. The <constant>
V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant> control determines how
Cb and Cr components are downsampled after coverting an input image
from RGB to Y'CbCr color space.
</entry>
</row>
<row>
<entrytbl spanname="descr" cols="2">
<tbody valign="top">
<row>
<entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_444</constant>
</entry><entry>No chroma subsampling, each pixel has
Y, Cr and Cb values.</entry>
</row>
<row>
<entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_422</constant>
</entry><entry>Horizontally subsample Cr, Cb components
by a factor of 2.</entry>
</row>
<row>
<entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_420</constant>
</entry><entry>Subsample Cr, Cb components horizontally
and vertically by 2.</entry>
</row>
<row>
<entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_411</constant>
</entry><entry>Horizontally subsample Cr, Cb components
by a factor of 4.</entry>
</row>
<row>
<entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_410</constant>
</entry><entry>Subsample Cr, Cb components horizontally
by 4 and vertically by 2.</entry>
</row>
<row>
<entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY</constant>
</entry><entry>Use only luminance component.</entry>
</row>
</tbody>
</entrytbl>
</row>
<row>
<entry spanname="id"><constant>V4L2_CID_JPEG_RESTART_INTERVAL</constant>
</entry><entry>integer</entry>
</row>
<row><entry spanname="descr">
The restart interval determines an interval of inserting RSTm
markers (m = 0..7). The purpose of these markers is to additionally
reinitialize the encoder process, in order to process blocks of
an image independently.
For the lossy compression processes the restart interval unit is
MCU (Minimum Coded Unit) and its value is contained in DRI
(Define Restart Interval) marker. If <constant>
V4L2_CID_JPEG_RESTART_INTERVAL</constant> control is set to 0,
DRI and RSTm markers will not be inserted.
</entry>
</row>
<row id="jpeg-quality-control">
<entry spanname="id"><constant>V4L2_CID_JPEG_COMPRESION_QUALITY</constant></entry>
<entry>integer</entry>
</row>
<row>
<entry spanname="descr">
<constant>V4L2_CID_JPEG_COMPRESION_QUALITY</constant> control
determines trade-off between image quality and size.
It provides simpler method for applications to control image quality,
without a need for direct reconfiguration of luminance and chrominance
quantization tables.

In cases where a driver uses quantization tables configured directly
by an application, using interfaces defined elsewhere, <constant>
V4L2_CID_JPEG_COMPRESION_QUALITY</constant> control should be set
by driver to 0.

<para>The value range of this control is driver-specific. Only
positive, non-zero values are meaningful. The recommended range
is 1 - 100, where larger values correspond to better image quality.
</para>
</entry>
</row>
<row id="jpeg-active-marker-control">
<entry spanname="id"><constant>V4L2_CID_JPEG_ACTIVE_MARKER</constant></entry>
<entry>bitmask</entry>
</row>
<row>
<entry spanname="descr">Specify which JPEG markers are included
in compressed stream. This control is valid only for encoders.
</entry>
</row>
<row>
<entrytbl spanname="descr" cols="2">
<tbody valign="top">
<row>
<entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP0</constant></entry>
<entry>Application data segment APP<subscript>0</subscript>.</entry>
</row><row>
<entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP1</constant></entry>
<entry>Application data segment APP<subscript>1</subscript>.</entry>
</row><row>
<entry><constant>V4L2_JPEG_ACTIVE_MARKER_COM</constant></entry>
<entry>Comment segment.</entry>
</row><row>
<entry><constant>V4L2_JPEG_ACTIVE_MARKER_DQT</constant></entry>
<entry>Quantization tables segment.</entry>
</row><row>
<entry><constant>V4L2_JPEG_ACTIVE_MARKER_DHT</constant></entry>
<entry>Huffman tables segment.</entry>
</row>
</tbody>
</entrytbl>
</row>
<row><entry></entry></row>
</tbody>
</tgroup>
</table>
<para>For more details about JPEG specification, refer
to <xref linkend="itu-t81"/>, <xref linkend="jfif"/>,
<xref linkend="w3c-jpeg-jfif"/>.</para>
</section>
</section>
8 changes: 6 additions & 2 deletions trunk/Documentation/DocBook/media/v4l/selection-api.xml
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Expand Up @@ -52,6 +52,10 @@ cropping and composing rectangles have the same size.</para>
</textobject>
</mediaobject>
</figure>

For complete list of the available selection targets see table <xref
linkend="v4l2-sel-target"/>

</section>

<section>
Expand Down Expand Up @@ -186,7 +190,7 @@ V4L2_SEL_TGT_COMPOSE_ACTIVE </constant> target.</para>

<section>

<title>Scaling control.</title>
<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
Expand All @@ -200,7 +204,7 @@ the scaling ratios using these values.</para>

<section>

<title>Comparison with old cropping API.</title>
<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
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