initial turbidity probe integration

cmd/rv/main.go

@@ -56,6 +56,8 @@ package main
 
 import (
 	"io"
+	"io/ioutil"
+	"log"
 	"os"
 	"runtime/pprof"
 	"strconv"
@@ -105,14 +107,15 @@ const (
 	profilePath      = "rv.prof"
 	pkg              = "rv: "
 	runPreDelay      = 20 * time.Second
-	turbidityDelay   = 60 * time.Second
+	turbidityDelay   = time.Second // Time delay for evaluating turbidity.
+	maxImages        = 10          // Max number of images read when evaluating turbidity.
 )
 
 // Software define pin values.
 // See https://netreceiver.appspot.com/help, External Pin Assignments.
 const (
 	bitratePin   = "X36"
-	saturationPin = "X38"
+	sharpnessPin = "X38"
 	contrastPin  = "X39"
 )
 
@@ -120,31 +123,49 @@ const (
 var canProfile = false
 
 type turbidityProbe struct {
-	saturation, contrast float64
+	sharpness, contrast float64
 }
 
 // TODO(Russell): complete this implementation of Write.
 func (tp *turbidityProbe) Write(p []byte) (int, error) {
-
 	ticker := time.NewTicker(turbidityDelay)
-	const (
-		rows = 2464
-		cols = 3280
-	)
 
 	go func() {
 		for {
 			select {
 			case <-ticker.C:
-				mat, err := gocv.NewMatFromBytes(rows, cols, gocv.MatTypeCV8U, p) // IMDecode may also work
+				var imgs []gocv.Mat
+				img := gocv.NewMat()
+
+				// Write byte array to a temp file.
+				file, err := ioutil.TempFile("temp", "video*.h264")
 				if err != nil {
-					//TODO
+					log.Fatalf("failed to create temp file: %v", err)
 				}
-				mat.GetUCharAt(0, 0)
+				defer os.Remove(file.Name())
+				_, err = file.Write(p)
+				if err != nil {
+					log.Fatalf("failed to write to %v: %v", file.Name(), err)
+				}
+
+				// Read the file and store each frame.
+				vc, err := gocv.VideoCaptureFile(file.Name())
+				if err != nil {
+					log.Fatalf("failed to read read file, %v: %v", file.Name(), err)
+				}
+				for vc.Read(&img) && len(imgs) < maxImages {
+					imgs = append(imgs, img.Clone())
+				}
+
+				// Process video data to get saturation and contrast scores. - TODO
+				tp.contrast = float64(len(imgs))
+				tp.sharpness = float64(len(imgs))
+				return
 			}
 		}
 	}()
 
+	time.Sleep(5 * time.Second)
 	return len(p), nil
 }
 
@@ -332,10 +353,10 @@ func readPin(p *turbidityProbe, rv *revid.Revid) func(pin *netsender.Pin) error
 			}
 		case pin.Name[0] == 'X':
 			return sds.ReadSystem(pin)
-		case pin.Name == saturationPin:
+		case pin.Name == sharpnessPin:
 			pin.Value = -1
 			if p != nil {
-				pin.Value = int(p.saturation * 1000)
+				pin.Value = int(p.sharpness * 1000)
 			}
 		case pin.Name == contrastPin:
 			pin.Value = -1

cmd/rv/probe_test.go

@@ -3,32 +3,21 @@ package main
 import (
 	"io/ioutil"
 	"testing"
-
-	"gocv.io/x/gocv"
 )
 
-func TestMain(t *testing.T) {
+// TestProbe reads a given video file and writes the sharpness and contrast scores to a turbidity probe
-	//ts := new(turbidityProbe)
+func TestProbe(t *testing.T) {
-	const (
+	ts := new(turbidityProbe)
-		rows = 2464
-		cols = 3280
-	)
 
-	// Read frame
+	video, err := ioutil.ReadFile("logo.h264")
-	frame, err := ioutil.ReadFile("AusOcean_logo_1080p.h264")
 	if err != nil {
-		t.Fatal(err)
+		t.Fatalf("failed to read file: %v", err)
 	}
 
-	// Decode
+	_, err = ts.Write(video)
-	//mat, err := gocv.NewMatFromBytes(rows, cols, gocv.MatTypeCV8UC3, frame)
-	mat, err := gocv.IMDecode(frame, gocv.IMReadUnchanged)
 	if err != nil {
-		t.Fatal(err)
+		t.Fatalf("failed to write sharpness and contrast: %v", err)
-	}
-	if mat.Empty() {
-		t.Fatal("Empty gocv.Mat")
 	}
 
-	gocv.IMWrite("logo.jpg", mat)
+	t.Logf("contrast: %v, sharpness: %v\n", ts.contrast, ts.sharpness)
 }