[chronojump] On Linux now can detect Supported modes of >1 camera

[Xavier de Blas <xaviblas src gnome org>]

commit 7aa2593115ae7cf6d3a95101e251d6de5f669b46
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Nov 4 16:13:48 2019 +0100

    On Linux now can detect Supported modes of >1 camera

 src/gui/preferences.cs                   | 8 +++++++-
 src/util.cs                              | 5 +++++
 src/webcam/webcamFfmpegSupportedModes.cs | 7 ++++++-
 3 files changed, 18 insertions(+), 2 deletions(-)
---
diff --git a/src/gui/preferences.cs b/src/gui/preferences.cs
index 55d059fe..8c5d201d 100644
--- a/src/gui/preferences.cs
+++ b/src/gui/preferences.cs
@@ -945,7 +945,13 @@ public class PreferencesWindow
                        return;
 
                if(operatingSystem == UtilAll.OperatingSystems.LINUX)
-                       wfsm = new WebcamFfmpegSupportedModesLinux();
+               {
+                       string number = "0";
+                       if(cameraCode.StartsWith("/dev/video") && cameraCode.Length > 10 && 
Util.IsNumber(cameraCode[10], false))
+                              number = cameraCode[10].ToString();
+
+                       wfsm = new WebcamFfmpegSupportedModesLinux(number);
+               }
                else if(operatingSystem == UtilAll.OperatingSystems.WINDOWS)
                        wfsm = new WebcamFfmpegSupportedModesWindows(cameraCode);
                else
diff --git a/src/util.cs b/src/util.cs
index 5fe74cb8..944e5ae4 100644
--- a/src/util.cs
+++ b/src/util.cs
@@ -821,6 +821,11 @@ public class Util
                LogB.Information("tryParse 'joan' as double: " + Util.IsNumber("joan",true).ToString()); 
//catalan (True)
        }
 
+       public static bool IsNumber(char c, bool canBeDecimal)
+       {
+               return IsNumber(c.ToString(), canBeDecimal);
+       }
+
        //gets a string and returns if all the chars are numbers or the decimal point in current localization
        public static bool IsNumber(string str, bool canBeDecimal) 
        {
diff --git a/src/webcam/webcamFfmpegSupportedModes.cs b/src/webcam/webcamFfmpegSupportedModes.cs
index 50c16d65..294beea9 100644
--- a/src/webcam/webcamFfmpegSupportedModes.cs
+++ b/src/webcam/webcamFfmpegSupportedModes.cs
@@ -134,9 +134,10 @@ public abstract class WebcamFfmpegSupportedModes
 
 public class WebcamFfmpegSupportedModesLinux : WebcamFfmpegSupportedModes
 {
-       public WebcamFfmpegSupportedModesLinux()
+       public WebcamFfmpegSupportedModesLinux(string cameraCode)
        {
                initialize();
+               this.cameraCode = cameraCode;
        }
 
        public override void GetModes()
@@ -147,7 +148,11 @@ public class WebcamFfmpegSupportedModesLinux : WebcamFfmpegSupportedModes
                        return;
                }
 
+               //v4l2-ctl -d 1 --list-formats-ext
+
                List<string> parameters = new List<string>();
+               parameters.Add("-d");
+               parameters.Add(cameraCode);
                parameters.Add("--list-formats-ext");
                ExecuteProcess.Result execute_result = ExecuteProcess.run ("v4l2-ctl", parameters, true, 
true);
                if(! execute_result.success) {