%entities; open()."> 2C"> Return ValueOn success 0 is returned, on error -1 and the errno variable is set appropriately:"> 2"> "> "> "> http://www.linuxtv.org/lists.php"> http://linuxtv.org/repo/"> ]> Revision 2.6.32 Michael Schimek H

mschimek@gmx.at

Bill Dirks Original author of the V4L2 API and documentation. Hans Verkuil Designed and documented the VIDIOC_LOG_STATUS ioctl, the extended control ioctls and major parts of the sliced VBI API.

hverkuil@xs4all.nl

Martin Rubli Designed and documented the VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS ioctls. Andy Walls Documented the fielded V4L2_MPEG_STREAM_VBI_FMT_IVTV MPEG stream embedded, sliced VBI data format in this specification.

awalls@radix.net

Mauro Carvalho Chehab Documented libv4l, designed and added v4l2grab example, Remote Controller chapter

mchehab@redhat.com

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Bill Dirks, Michael H. Schimek, Hans Verkuil, Martin Rubli, Andy Walls, Mauro Carvalho Chehab This document is copyrighted © 1999-2009 by Bill Dirks, Michael H. Schimek, Hans Verkuil, Martin Rubli, Andy Walls and Mauro Carvalho Chehab. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the appendix entitled "GNU Free Documentation License". Programming examples can be used and distributed without restrictions. 2.6.32 2009-08-31 mcc Now, revisions will match the kernel version where the V4L2 API changes will be used by the Linux Kernel. Also added Remote Controller chapter. 0.29 2009-08-26 ev Added documentation for string controls and for FM Transmitter controls. 0.28 2009-08-26 gl Added V4L2_CID_BAND_STOP_FILTER documentation. 0.27 2009-08-15 mcc Added libv4l and Remote Controller documentation; added v4l2grab and keytable application examples. 0.26 2009-07-23 hv Finalized the RDS capture API. Added modulator and RDS encoder capabilities. Added support for string controls. 0.25 2009-01-18 hv Added pixel formats VYUY, NV16 and NV61, and changed the debug ioctls VIDIOC_DBG_G/S_REGISTER and VIDIOC_DBG_G_CHIP_IDENT. Added camera controls V4L2_CID_ZOOM_ABSOLUTE, V4L2_CID_ZOOM_RELATIVE, V4L2_CID_ZOOM_CONTINUOUS and V4L2_CID_PRIVACY. 0.24 2008-03-04 mhs Added pixel formats Y16 and SBGGR16, new controls and a camera controls class. Removed VIDIOC_G/S_MPEGCOMP. 0.23 2007-08-30 mhs Fixed a typo in VIDIOC_DBG_G/S_REGISTER. Clarified the byte order of packed pixel formats. 0.22 2007-08-29 mhs Added the Video Output Overlay interface, new MPEG controls, V4L2_FIELD_INTERLACED_TB and V4L2_FIELD_INTERLACED_BT, VIDIOC_DBG_G/S_REGISTER, VIDIOC_(TRY_)ENCODER_CMD, VIDIOC_G_CHIP_IDENT, VIDIOC_G_ENC_INDEX, new pixel formats. Clarifications in the cropping chapter, about RGB pixel formats, the mmap(), poll(), select(), read() and write() functions. Typographical fixes. 0.21 2006-12-19 mhs Fixed a link in the VIDIOC_G_EXT_CTRLS section. 0.20 2006-11-24 mhs Clarified the purpose of the audioset field in struct v4l2_input and v4l2_output. 0.19 2006-10-19 mhs Documented V4L2_PIX_FMT_RGB444. 0.18 2006-10-18 mhs Added the description of extended controls by Hans Verkuil. Linked V4L2_PIX_FMT_MPEG to V4L2_CID_MPEG_STREAM_TYPE. 0.17 2006-10-12 mhs Corrected V4L2_PIX_FMT_HM12 description. 0.16 2006-10-08 mhs VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS are now part of the API. 0.15 2006-09-23 mhs Cleaned up the bibliography, added BT.653 and BT.1119. capture.c/start_capturing() for user pointer I/O did not initialize the buffer index. Documented the V4L MPEG and MJPEG VID_TYPEs and V4L2_PIX_FMT_SBGGR8. Updated the list of reserved pixel formats. See the history chapter for API changes. 0.14 2006-09-14 mr Added VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS proposal for frame format enumeration of digital devices. 0.13 2006-04-07 mhs Corrected the description of struct v4l2_window clips. New V4L2_STD_ and V4L2_TUNER_MODE_LANG1_LANG2 defines. 0.12 2006-02-03 mhs Corrected the description of struct v4l2_captureparm and v4l2_outputparm. 0.11 2006-01-27 mhs Improved the description of struct v4l2_tuner. 0.10 2006-01-10 mhs VIDIOC_G_INPUT and VIDIOC_S_PARM clarifications. 0.9 2005-11-27 mhs Improved the 525 line numbering diagram. Hans Verkuil and I rewrote the sliced VBI section. He also contributed a VIDIOC_LOG_STATUS page. Fixed VIDIOC_S_STD call in the video standard selection example. Various updates. 0.8 2004-10-04 mhs Somehow a piece of junk slipped into the capture example, removed. 0.7 2004-09-19 mhs Fixed video standard selection, control enumeration, downscaling and aspect example. Added read and user pointer i/o to video capture example. 0.6 2004-08-01 mhs v4l2_buffer changes, added video capture example, various corrections. 0.5 2003-11-05 mhs Pixel format erratum. 0.4 2003-09-17 mhs Corrected source and Makefile to generate a PDF. SGML fixes. Added latest API changes. Closed gaps in the history chapter. 0.3 2003-02-05 mhs Another draft, more corrections. 0.2 2003-01-15 mhs Second draft, with corrections pointed out by Gerd Knorr. 0.1 2002-12-01 mhs First draft, based on documentation by Bill Dirks and discussions on the V4L mailing list. Video For Linux Two is the second version of the Video For Linux API, a kernel interface for analog radio and video capture and output drivers. Early drivers used ad-hoc interfaces. These were replaced in Linux 2.2 by Alan Cox' V4L API, based on the interface of the bttv driver. In 1999 Bill Dirks started the development of V4L2 to fix some shortcomings of V4L and to support a wider range of devices. The API was revised again in 2002 prior to its inclusion in Linux 2.5/2.6, and work continues on improvements and additions while maintaining compatibility with existing drivers and applications. In 2006/2007 efforts began on FreeBSD drivers with a V4L2 interface. This book documents the V4L2 API. Intended audience are driver and application writers. If you have questions or ideas regarding the API, please write to the linux-media mailing list: &v4l-ml;. The latest version of this document and the DocBook SGML sources are part of the &v4l-dvb; repository. The online version is available here: http://linuxtv.org/downloads/video4linux/API/V4L2_API. &sub-common; &sub-pixfmt; &sub-io;

&sub-dev-capture;

&sub-dev-overlay;

&sub-dev-output;

&sub-dev-osd;

&sub-dev-codec;

&sub-dev-effect;

&sub-dev-raw-vbi;

&sub-dev-sliced-vbi;

&sub-dev-teletext;

&sub-dev-radio;

&sub-dev-rds;

&sub-close; &sub-ioctl; &sub-cropcap; &sub-dbg-g-chip-ident; &sub-dbg-g-register; &sub-encoder-cmd; &sub-enumaudio; &sub-enumaudioout; &sub-enum-fmt; &sub-enum-framesizes; &sub-enum-frameintervals; &sub-enuminput; &sub-enumoutput; &sub-enumstd; &sub-g-audio; &sub-g-audioout; &sub-g-crop; &sub-g-ctrl; &sub-g-enc-index; &sub-g-ext-ctrls; &sub-g-fbuf; &sub-g-fmt; &sub-g-frequency; &sub-g-input; &sub-g-jpegcomp; &sub-g-modulator; &sub-g-output; &sub-g-parm; &sub-g-priority; &sub-g-sliced-vbi-cap; &sub-g-std; &sub-g-tuner; &sub-log-status; &sub-overlay; &sub-qbuf; &sub-querybuf; &sub-querycap; &sub-queryctrl; &sub-querystd; &sub-reqbufs; &sub-s-hw-freq-seek; &sub-streamon; &sub-mmap; &sub-munmap; &sub-open; &sub-poll; &sub-read; &sub-select; &sub-write; &sub-driver; &sub-libv4l; &sub-remote_controllers; &sub-compat; &sub-videodev2-h; &sub-capture-c; This program demonstrates how to grab V4L2 images in ppm format by using libv4l handlers. The advantage is that this grabber can potentially work with any V4L2 driver. &sub-v4l2grab-c; &sub-fdl-appendix; &sub-indices; &sub-biblio;