cmd/revid-cli & revid: adding raspivid exposure and brightness parameters

Started working on adding exposure, brightness, saturation and awb flags to revid-cli so that we can control raspivid parameters.
Updated revid logic to give these to raspivid and updated config to consider these parameters in config validation.

cmd/revid-cli/main.go

@@ -128,6 +128,12 @@ func handleFlags() revid.Config {
 		logPathPtr            = flag.String("LogPath", defaultLogPath, "The log path")
 		configFilePtr         = flag.String("ConfigFile", "", "NetSender config file")
 		sendRetryPtr          = flag.Bool("retry", false, "Specify whether a failed send should be retried.")
+		
+		brightnessPtr		  = flag.Uint("Brightness", -1, "Set Brightness: 0-100 ")
+		saturationPtr		  = flag.Uint("Saturation", 0, "Set Saturation: -100:100")
+		exposurePtr			  = flag.String("Exposure", "", "Set Exposure Mode: Auto/Night/Spotlight")
+		autoWhiteBalancePtr	  = flag.String("AutoWhiteBalance", "", "Set Automatic White Balance mode")
+
 	)
 
 	var outputs flagStrings
@@ -234,6 +240,7 @@ func handleFlags() revid.Config {
 		log.Log(logger.Error, pkg+"bad packetization argument")
 	}
 
+
 	if *configFilePtr != "" {
 		netsender.ConfigFile = *configFilePtr
 	}
@@ -255,6 +262,11 @@ func handleFlags() revid.Config {
 	cfg.RtpAddress = *rtpAddrPtr
 	cfg.SendRetry = *sendRetryPtr
 
+	cfg.Brightness = *brightnessPtr
+	cfg.Saturation = *saturationPtr
+	cfg.Exposure = *exposurePtr
+	cfg.AutoWhiteBalance = *autoWhiteBalancePtr
+
 	return cfg
 }
 

revid/config.go

@@ -69,6 +69,11 @@ type Config struct {
 	Logger             Logger
 	SendRetry          bool
 	BurstPeriod        uint
+
+	Brightness		   uint
+	Saturation		   uint
+	Exposure		   string
+	AutoWhiteBalance   string
 }
 
 // Enums for config struct
@@ -116,6 +121,10 @@ const (
 	defaultVerbosity          = No // FIXME(kortschak): This makes no sense whatsoever. No is currently 15.
 	defaultRtpAddr            = "localhost:6970"
 	defaultBurstPeriod        = 10 // Seconds
+	
+	notDefinedBrightness	  =-1  //outside range (0-100)
+	notDefinedSaturation	  =-101 //outside range (-100-(100))
+
 )
 
 // Validate checks for any errors in the config fields and defaults settings

revid/revid.go

@@ -609,6 +609,17 @@ func (r *Revid) startRaspivid() error {
 		"--height", fmt.Sprint(r.config.Height),
 		"--bitrate", fmt.Sprint(r.config.Bitrate),
 		"--framerate", fmt.Sprint(r.config.FrameRate),
+
+		"--brightness", fmt.Sprint(r.config.Brightness),
+		"--saturation", fmt.Sprint(r.config.Saturation),
+		"--exposure", fmt.Sprint(r.config.Exposure),
+		"--awb", fmt.Sprint(r.config.AutoWhiteBalance),
+	}
+	if cfg.Brightness != notDefinedBrightness {
+		args = append(args, "--brightness")
+	}
+	if cfg.Saturation != notDefinedSaturation {
+		args = append(args, "--saturation")
 	}
 	if r.config.FlipHorizontal {
 		args = append(args, "--hflip")