Features/BetterWebcamSupport

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(Better Webcam Support)
(Better Webcam Support)
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= Better Webcam Support =
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= Even Better Webcam Support =
  
 
== Summary ==
 
== Summary ==
  
Currently many webcams do not work with Fedora out of the box even though Linux driver exist for them, the intent is to fix this.
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The Better Webcam support feature for F-10 has added support for many webcams, but there still are many models which are unsupported
 +
the goal of this feature is to get a whole lot more webcams supported out of the box.
  
 
== Owner ==
 
== Owner ==
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== Current status ==
 
== Current status ==
* Targeted release: [[Releases/10|  Fedora 10]]  
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* Targeted release: [[Releases/12|  Fedora 12]]  
* Last updated: (Oct 23 2008)
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* Last updated: (Jun 15 2009)
* Percentage of completion: 100%
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* Percentage of completion: 30%
  
 
== Detailed Description ==
 
== Detailed Description ==
  
Webcams not working even though there are Linux drivers has 2 causes:
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The Better Webcam support feature for F-10 has done much of the groundwork needed for properly supporting webcams in Linux. We now
# The drivers are not in the mainline kernel
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have a library (libv4l) for decompressing various proprietary video formats in userspace, and almost all webcam using applications have been patched to use this library.
# Those drivers that are in the mainline kernel are often v4l2 while many applications will only work with v4l1. Even v4l2 apps often don't work with v4l2 webcam's as the webcams often have camspecific (compressed) pixelformats and most applications don't support all these,
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1) Has been largely fixed by working together with gspca upstream to get [http://moinejf.free.fr/ gspcav2] cleaned up and merged, Linus has merged gspcav2 (through the v4l-dvb subsystem) for 2.6.27,
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The second push for better webcam contains of 3 pieces:
this vastly improves the amount of supported webcams in 2.6.27. I'm currently working on getting the
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# Lots of testing and bugfixing / improving of existing in kernel drivers. I need access to cams for this! As you can see in the
people behind the [http://groups.google.com/group/microdia micromedia driver] for the quite popular sonix sn9c20x based cams, to port their driver to a gspca subdriver and move the cam specific format decoding to userspace as was done with all the gspca decoding routines. The plan is to work together with the various upstreams to port any remaining standalone usb webcam drivers to gspca subdrivers, this is a process which will continue after F-10's release.
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matrix below I already have quite a few of them, most of which were bought from my own money especially for this. If you have old cams to donate please contact me!
 
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# Add video processing to libv4l for better video quality for cams which lack any of the following in hardware:
2) Has been fixed by creating a utility library which contains all the conversion stuff and v4l1 compatibility functions so that applications can easily be modified to work properly with v4l2 webcams,
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## White Balancing
for more info on his library called libv4l, see:
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## Gamma Correction
http://hansdegoede.livejournal.com/3636.html
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## Automatic adjustment of Exposure / Gain
 
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# Clean up existing out of tree drivers, moving the decompression to libv4l were needed and merge them into the mainline, specifically the following ones:
The most popular v4l applications in Fedora have all been patched to use libv4l: amsn, camE, camstream, cheese (gstreamer), ekiga (ptlib), gyachi, xawtv and ucview (unicap)
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## qc-usb: stv0600 (and alike) based cams mainly logitech quickcam express (done as of kernel 2.6.29)
 
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## ov51x-jpeg: ov511(+) and ov518(+) driver
Also refer http://kernelnewbies.org/Linux_2_6_26#head-6d4ee1ddea983f5c8ac491b8685a94ea6fa4132b
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## qc-usb-messenger: st6422 based cams mainly logitech quickcam messenger models
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## sn9c20x: sn9c20x based cams, many newer cheap cams
  
 
== Benefit to Fedora ==
 
== Benefit to Fedora ==
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This may require temporarily carrying kernel patches if drivers are clearly moving upstream, but not there yet in time for release.
 
This may require temporarily carrying kernel patches if drivers are clearly moving upstream, but not there yet in time for release.
  
This requires packaging libv4l for v4l1 emulation and format conversion and making modifications to webcam using applications so that they use libv4l.
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This requires updating libv4l to a version which contains the new video processing code and can decompress any formats produced by
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new drivers.
  
 
== Test Plan ==
 
== Test Plan ==

Revision as of 19:49, 15 June 2009

Contents

Even Better Webcam Support

Summary

The Better Webcam support feature for F-10 has added support for many webcams, but there still are many models which are unsupported the goal of this feature is to get a whole lot more webcams supported out of the box.

Owner

  • Name: Hans de Goede

Current status

  • Targeted release: Fedora 12
  • Last updated: (Jun 15 2009)
  • Percentage of completion: 30%

Detailed Description

The Better Webcam support feature for F-10 has done much of the groundwork needed for properly supporting webcams in Linux. We now have a library (libv4l) for decompressing various proprietary video formats in userspace, and almost all webcam using applications have been patched to use this library.

The second push for better webcam contains of 3 pieces:

  1. Lots of testing and bugfixing / improving of existing in kernel drivers. I need access to cams for this! As you can see in the

matrix below I already have quite a few of them, most of which were bought from my own money especially for this. If you have old cams to donate please contact me!

  1. Add video processing to libv4l for better video quality for cams which lack any of the following in hardware:
    1. White Balancing
    2. Gamma Correction
    3. Automatic adjustment of Exposure / Gain
  2. Clean up existing out of tree drivers, moving the decompression to libv4l were needed and merge them into the mainline, specifically the following ones:
    1. qc-usb: stv0600 (and alike) based cams mainly logitech quickcam express (done as of kernel 2.6.29)
    2. ov51x-jpeg: ov511(+) and ov518(+) driver
    3. qc-usb-messenger: st6422 based cams mainly logitech quickcam messenger models
    4. sn9c20x: sn9c20x based cams, many newer cheap cams

Benefit to Fedora

Out of the box working hardware makes for happy end users and good reviews.

Scope

This may require temporarily carrying kernel patches if drivers are clearly moving upstream, but not there yet in time for release.

This requires updating libv4l to a version which contains the new video processing code and can decompress any formats produced by new drivers.

Test Plan

I currently test with the following webcams:

Webcam USB ID Bridge Sensor Status
Sweex WC001 0c45:6005 sn9c101 tas5110 works
Sweex WC004 0c45:6011 sn9c101 ov6650 works
Qware EasyCam WB-001 0c45:6028 sn9c102 pas202 works *
Intel Create and Share 0733:0401 spca501 integrated works
Creative Live! VISTA VF0420 041e:4064 ov519 OV7670 works
Trust WB-1400T 093a:2468 pac207 integrated works
I.T. Works PCW 03 093a:2460 pac207 integrated works
Logitech QuickCam IM/Connect 046d:08d9 zc3xx HV7131R works
Labtec notebook cam 046d:08aa zc3xx HDCS2020 works
Creative WebCam Vista 041e:403b spca561 integrated works
Logitech QuickCam Express Plus 046d:092f spca561 integrated works
Philips PCVC820K/00 05a9:0518 ov518  ? Does not work out of tree driver
Philips SPC 200NC 0471:0325 zc3xx PAS106 works
Creative Webcam Pro 05a9:a511 ov511  ? Does not work out of tree driver
I.T. Works notebook cam 093a:2621 pac7302 integrated works **
Trust WB-3400T 093a:260e pac7311 integrated works ***
Dynalink ??? 06be:d001 NW802 integrated Does not work out of tree driver
Sitecom Voicecam 0c45:62bb sn0c202 ov7660 Does not work out of tree driver
Silvercrest Webcam 1.3mpix eb1a:2820 eMPIA em28xx  ? Does not work
Logitech Sphere MP 046d:08cc uvcvideo NA works
Logitech QuickCam Express 046d:0840 STV0600 PB100 Does not work out of tree driver
Pleomax / Typhoon Easycam 330K 093a:2600 pac7311 integrated works ***
Creative Live! Cam Video IM 041e:4053 zc3xx TAS5130 works

(*) works, but does not work well in low light conditions (**) works, but has jpeg compression artifacts when used in bright daylight (***) sortof works, really bad cams, do not buy!

Also see here for cams which are supported by gspca and their testing status with the new cleaned up gspcav2.

Tests are done with the following applications:

  • xawtv
  • cheese
  • ekiga
  • camorama *
  • vlc *
  • mplayer *
  • skype *

(*) Not in Fedora

User Experience

Out of the box working hardware.

Dependencies

None.

Contingency Plan

Don't ship the drivers / wrapper if they aren't ready.

Documentation

Fedora 10 comes with a much cleaned up and ported to v4l2 version of the gspca webcam driver. Many of the supported webcams produce video data in a manufacturer specific video format, Fedora 10 comes with libv4l which handles conversion of these custom formats to the standard video formats that most applications need. The most popular v4l applications in Fedora have all been modified to use libv4l directly: amsn, camE, camstream, cheese (gstreamer), ekiga (ptlib), gyachi, xawtv and ucview (unicap). If you encounter a Fedora application which has not been patched yet, you can use the method described for 3th party applications below. Please also file a bug and put Hans de Goede <hdegoede@redhat.com> in the CC of that bug.

For 3th party applications such as for example skype a compatibility library wrapper has been made available. You can make 32 bits applications use this wrapper by typing the following command in a terminal before starting the application from that same terminal: export LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so

And then start the application from that same terminal!

For 64 bit applications the command is:

export LD_PRELOAD=/usr/lib64/libv4l/v4l1compat.so

Note that for example skype is a 32 bit applications, so even when running a 64 bit version of Fedora you should use the 32 bit command!

Don't get fooled by the v4l1compat.so name, this library wrapper does not only add v4l1 applicatiom compatibility to v4l2 drivers (such as the new gspca and the uvc driver) but it also handles conversion from cam specific formats to generic video formats for v4l2 applications. If you only want the conversion, without the v4l1 compatibility you can use "v4l2convert.so" instead of v4l1compat.so .

Release Notes

Fedora 10 comes with much improved support for webcams.

Next to improvements to the UVC driver which was first introduced in Fedora 9 and supports any webcam with a vista compliant logo, Fedora 10 also features a brand new v4l2 version of gspca, an usb webcam driver framework with support for many different usb webcam bridges and sensors.

Userspace support for webcams has also been improved by adding libv4l and updating all webcam using applications to use libv4l, this makes these applications understand the often manufacturer specific and custom video formats emitted by many webcams, esp. by many of the webcams supported by gspca.

For a list of all webcams and applications with which Fedora-10's new webcam support has been tested see the BetterWebcamSupport feature page, for a list of all cams supported by the original version of gspca see the original gspca website. The v4l2 version of gspca in Fedora-10 supports all these webcams and more!

Comments and Discussion

See Talk:Features/BetterWebcamSupport