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+====== Text WebCam Support ======
+[[:english#objects|{{  :objects.png}}]][[:english|{{  :rocrail-logo-35.png}}]]
+[[:english|Content]] -> [[:english#objects|Objects]] ->   **[[:text-en|Text]]**
+  * **[[:text:text-webcam-en|WebCam]]** | [[:text:text-webcam-server-en|WebCam on Server]]
+ \\
+| The used Rocrail revision must be at least 9832. |\\
+ \\
+=====Introduction=====
+{{ http://www.logitech.com/assets/36163/webcam-c170-glamour-image-lg.png?0x200}}
+This functionality is especially of interest for monitoring invisible spots on the layout, for example shadow stations.\\
+USB WebCams can be used and are low priced; High Definition WebCams are not needed for this purpose. For testing purpose a [[http://www.logitech.com/de-de/product/webcam-c170|Logitech C170]] has been used which comes for about €20,-.\\
+Rocview will not show the WebCam as a movie but as still pictures with a definable refresh interval which is OK to see what is happening.\\
+An external capturing program is needed to provide the still pictures to make this functionality for Rocrail Operating System independent; See the __**[[#capturing_script|Script paragraph]]**__.\\
+ \\
+=====Text Setup=====
+{{:text:text-webcam-2-en.png}}\\
+The content of the text object must point to the WebCam picture.\\
+The __**[[:text-en#refresh|Refresh time]]**__ in ms must have a value of at least 100. A good value is 500.\\
+Resizing of the text object can be done with the **cx** and **cy** grid values on the General tab.\\
+{{:text:text-webcam-size-en.png?400}}\\
+ \\
+=====Capturing Script=====
+====Mac OS X====
+The tool [[http://webcam-tools.sourceforge.net|WACAW]] is used on a Mac to capture a still picture of a WebCam.\\
+<code bash>
+#!/bin/bash
+while :
+do
+  if [ ! -f /Users/rob/webcam1/picture.png ]; then
+    echo "Snapping a new picture of the webcam..."
+    ./wacaw -d 2 --png /Users/rob/webcam1/_picture
+    mv /Users/rob/webcam1/_picture.png /Users/rob/webcam1/picture.png
+  fi
+  sleep 0.25
+done
+</code>
+(Do not forget to make this new script executable with **chmod +x webcam1.sh**.)\\
+If the color of the captured pictures is bad the **-n** parameter must be used:
+<code bash>
+    ./wacaw -d 2 -n 5 --png /Users/rob/webcam1/picture
+</code>
+ \\
+===Detecting the device number===
+With the **-L** command line option the device list ist shown:
+<code>
+./wacaw -L
+There are 3 devices in the list.
+The current selection is 2.
+- DV Video [is available] [has no inputs]
+- IIDC FireWire Video [is available] [has no inputs]
+- USB Video Class Video [is available] [has inputs]
+    There are 1 inputs for this device (2).
+    The current selection is 0.
+- Webcam C170 [is available]
+</code>
+In this example the device number to use is 2: **-d 2**.\\
+ \\
+====Linux====
+Under Linux the **avconv** tool can be used to capture pictures:
+<code>
+sudo apt-get install libav-tools
+</code>
+<code bash>
+#!/bin/bash
+while :
+do
+  if [ ! -f /home/rob/webcam1/picture.png ]; then
+    echo "Snapping a new picture of the webcam..."
+    avconv -f video4linux2 -i /dev/video1 -frames 1 /home/rob/webcam1/_picture.png
+    mv /home/rob/webcam1/_picture.png /home/rob/webcam1/picture.png
+  fi
+  sleep 0.25
+done
+</code>
+===Devices===
+With
+<code>
+ls /dev/video*
+</code>
+a list of video devices will be shown.\\
+If the PC/Laptop ha a build-in camera this will show up as **/dev/video0**.\\
+The first external WebCam will be in this case **/dev/video1**.\\
+ \\
+====Windows====
+  * https://batchloaf.wordpress.com/commandcam/
+  * http://www.imagemagick.org/script/binary-releases.php
+This script has not been tested and uses Irfanview as capture tool.\\
+<code batch>
+:startallover
+IF NOT exist "C:\webcam1\picture.png"\ (
+  REM Change the Twain Source
+  REM http://www.gssezisoft.com/Products/CmdTwain/Download/SetTwainSource.zip
+  REM  cscript.exe SetTwainSource.vbs driver
+  i_view32.exe /scanhidden /dpi=(150,150) /convert="C:\webcam1\picture.png"
+)
+ping -n 1 127.0.0.1 > NULL
+GOTO startallover</code>
+==Alternative==
+The folowing Batch script used **commandcam.exe** for grabbing and **bmp2png.exe** for picture converting and was successful tested.\\
+  * Download:
+    * https://batchloaf.wordpress.com/commandcam/ -> Download and Documentation
+    * http://sourceforge.net/projects/pmt/files/bmp2png/1.6.2/b2p162d.zip/download -> Extract BMP2PNG.EXE from the ZIP file (also for Win 10)
+This files require less resources than IrfanView. \\
+<code batch>
+echo off
+:start
+if exist picture.png goto start
+commandcam.exe /quiet /filename picture.bmp /delay 10
+bmp2png.exe -Q picture.bmp
+goto start
+</code>
+>**Remark:** The code above need that all files are placed in the same folder. \\ Otherwise, the path information corresponding to the different directories have to be supplemented.
+Informations to the installed video hardware may so be requested:
+<code>
+commandcam.exe /devlistdetail
+</code>
+If multiple video devices are installed, an additional option can select the device. \\
+In this example the device number "2":
+<code>
+...
+commandcam.exe /quiet /filename picture.bmp /delay 10 /devnum 2
+...
+</code>
+=====File Handshake=====
+Only one at a time of both programs, wacaw (or any other capturing program) and Rocview, should access the picture file to avoid invalid images.\\
+  - The script will capture a picture and store it in the picture.png file.
+  - Rocview will read and show it.
+  - Rocview deletes the picture.png.
+  - The script detect that the picture.png is deleted and will capture the next picture of the WebCam.
+  - Goto step 2...

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