[chronojump] webcamFfmpegSupportedModes parsing works on Windows

[Xavier de Blas <xaviblas src gnome org>]

commit bc594feed160d6e870e73bafe729f006d8e8715c
Author: Xavier de Blas <xaviblas gmail com>
Date:   Thu Jun 13 14:05:24 2019 +0200

    webcamFfmpegSupportedModes parsing works on Windows

 src/webcamFfmpegSupportedModes.cs | 55 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
---
diff --git a/src/webcamFfmpegSupportedModes.cs b/src/webcamFfmpegSupportedModes.cs
index 1225e8c2..24f270e7 100644
--- a/src/webcamFfmpegSupportedModes.cs
+++ b/src/webcamFfmpegSupportedModes.cs
@@ -147,6 +147,14 @@ public class WebcamFfmpegSupportedModesWindows : WebcamFfmpegSupportedModes
 
        public override void GetModes()
        {
+               bool testParsing = false; //change it to true to test the parsing method
+
+               if(testParsing)
+               {
+                       modesStr = parseSupportedModes(parseSupportedModesTestString);
+                       return;
+               }
+
                string executable = System.IO.Path.Combine(Util.GetPrefixDir(), "bin/ffmpeg.exe");
                //ffmpeg -f dshow -list_options true -i video="USB 2.0 WebCamera"
                List<string> parameters = new List<string>();
@@ -171,10 +179,57 @@ public class WebcamFfmpegSupportedModesWindows : WebcamFfmpegSupportedModes
                modesStr = execute_result.allOutput;
        }
 
+       //TODO: have a class that sorts resolutions and framerates
        protected override string parseSupportedModes(string allOutput)
        {
+               string parsedAll = "Resolution \tFramerate";
+
+               /*
+                * break the big string in \n strings
+                * https://stackoverflow.com/a/1547483
+                */
+               string[] lines = allOutput.Split(
+                               new[] { Environment.NewLine },
+                               StringSplitOptions.None
+                               );
+
+               bool foundAtLeastOne = false;
+               foreach(string l in lines)
+               {
+                       LogB.Information("line: " + l);
+
+                       if(l.Contains("pixel_format=") && matchResolutionAndFPS(l) != "")
+                       {
+                               parsedAll += "\n" + matchResolutionAndFPS(l);
+                               foundAtLeastOne = true;
+                       }
+               }
+
+               if(! foundAtLeastOne)
+                       return "Not found any mode supported for your camera.";
+
+               return parsedAll;
+       }
+
+       private string matchResolutionAndFPS(string l)
+       {
+               //match this:
+               //pixel_format=yuyv422  min s=640x480 fps=5 max s=640x480 fps=30
+               Match match = Regex.Match(l, @"max\s+s=(\d+)x(\d+)\s+fps=(\d+)");
+
+               LogB.Information("match group count is 4?", (match.Groups.Count == 4).ToString());
+
+               if(match.Groups.Count == 4)
+                       return string.Format("{0}x{1} \t{2} fps", match.Groups[1].Value, 
match.Groups[2].Value, match.Groups[3].Value);
+
                return "";
        }
+
+       // test ParseSupportModes
+       private string parseSupportedModesTestString = @"
+pixel_format=uyyv422  min s=160x120 fps=5 max s=160x120 fps=30
+pixel_format=uyyv422  min s=176x144 fps=5 max s=176x144 fps=30
+pixel_format=uyyv422  min s=320x240 fps=5 max s=320x240 fps=30";
 }
 
 public class WebcamFfmpegSupportedModesMac : WebcamFfmpegSupportedModes