detect mode

app/src/main/java/xdsopl/robot36/Decoder.java

@@ -6,6 +6,8 @@ Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
 
 package xdsopl.robot36;
 
+import java.util.ArrayList;
+
 public class Decoder {
 
 	private final Demodulator demodulator;
@@ -20,7 +22,12 @@ public class Decoder {
 	private final int scanLineToleranceSamples;
 	private final int scopeWidth;
 	private final int scopeHeight;
+	private final Mode rawMode;
+	private final ArrayList<Mode> syncPulse5msModes;
+	private final ArrayList<Mode> syncPulse9msModes;
+	private final ArrayList<Mode> syncPulse20msModes;
 
+	public String curMode;
 	public int curLine;
 	private int curSample;
 
@@ -42,6 +49,25 @@ public class Decoder {
 		last20msSyncPulses = new int[syncPulseCount];
 		double scanLineToleranceSeconds = 0.001;
 		scanLineToleranceSamples = (int) Math.round(scanLineToleranceSeconds * sampleRate);
+		rawMode = new Raw();
+		syncPulse5msModes = new ArrayList<>();
+		syncPulse5msModes.add(new Wraase_SC2_180(sampleRate));
+		syncPulse5msModes.add(new Martin("1", 0.146432, sampleRate));
+		syncPulse5msModes.add(new Martin("2", 0.073216, sampleRate));
+		syncPulse9msModes = new ArrayList<>();
+		syncPulse9msModes.add(new Robot_36_Color(sampleRate));
+		syncPulse9msModes.add(new Robot_72_Color(sampleRate));
+		syncPulse9msModes.add(new Scottie("1", 0.138240, sampleRate));
+		syncPulse9msModes.add(new Scottie("2", 0.088064, sampleRate));
+		syncPulse9msModes.add(new Scottie("DX", 0.3456, sampleRate));
+		syncPulse20msModes = new ArrayList<>();
+		syncPulse20msModes.add(new PaulDon("50", 0.09152, sampleRate));
+		syncPulse20msModes.add(new PaulDon("90", 0.17024, sampleRate));
+		syncPulse20msModes.add(new PaulDon("120", 0.1216, sampleRate));
+		syncPulse20msModes.add(new PaulDon("160", 0.195584, sampleRate));
+		syncPulse20msModes.add(new PaulDon("180", 0.18304, sampleRate));
+		syncPulse20msModes.add(new PaulDon("240", 0.24448, sampleRate));
+		syncPulse20msModes.add(new PaulDon("290", 0.2288, sampleRate));
 	}
 
 	private void adjustSyncPulses(int[] pulses, int shift) {
@@ -77,7 +103,20 @@ public class Decoder {
 		}
 	}
 
-	private boolean processSyncPulse(int[] pulses, int[] lines, int index) {
+	private Mode detectMode(ArrayList<Mode> modes, int line) {
+		Mode bestMode = rawMode;
+		int bestDist = Integer.MAX_VALUE;
+		for (Mode mode : modes) {
+			int dist = Math.abs(line - mode.getScanLineSamples());
+			if (dist <= scanLineToleranceSamples && dist < bestDist) {
+				bestDist = dist;
+				bestMode = mode;
+			}
+		}
+		return bestMode;
+	}
+
+	private boolean processSyncPulse(ArrayList<Mode> modes, int[] pulses, int[] lines, int index) {
 		for (int i = 1; i < lines.length; ++i)
 			lines[i - 1] = lines[i];
 		lines[lines.length - 1] = index - pulses[pulses.length - 1];
@@ -88,6 +127,8 @@ public class Decoder {
 			return false;
 		if (scanLineStdDev(lines) > scanLineToleranceSamples)
 			return false;
+		Mode mode = detectMode(modes, lines[0]);
+		curMode = mode.getName();
 		if (pulses[0] >= lines[0]) {
 			int lineSamples = lines[0];
 			int endPulse = pulses[0];
@@ -131,11 +172,11 @@ public class Decoder {
 		if (syncPulseDetected) {
 			switch (demodulator.syncPulseWidth) {
 				case FiveMilliSeconds:
-					return processSyncPulse(last5msSyncPulses, last5msScanLines, syncPulseIndex);
+					return processSyncPulse(syncPulse5msModes, last5msSyncPulses, last5msScanLines, syncPulseIndex);
 				case NineMilliSeconds:
-					return processSyncPulse(last9msSyncPulses, last9msScanLines, syncPulseIndex);
+					return processSyncPulse(syncPulse9msModes, last9msSyncPulses, last9msScanLines, syncPulseIndex);
 				case TwentyMilliSeconds:
-					return processSyncPulse(last20msSyncPulses, last20msScanLines, syncPulseIndex);
+					return processSyncPulse(syncPulse20msModes, last20msSyncPulses, last20msScanLines, syncPulseIndex);
 			}
 		}
 		return false;

app/src/main/java/xdsopl/robot36/MainActivity.java

@@ -54,6 +54,7 @@ public class MainActivity extends AppCompatActivity {
 			if (decoder.process(recordBuffer)) {
 				scopeBitmap.setPixels(scopePixels, scopeWidth * decoder.curLine, scopeWidth, 0, 0, scopeWidth, scopeHeight);
 				scopeView.invalidate();
+				status.setText(decoder.curMode);
 			}
 		}
 	};

app/src/main/java/xdsopl/robot36/Martin.java

@@ -0,0 +1,30 @@
+/*
+Martin modes
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class Martin implements Mode {
+	private final int scanLineSamples;
+	private final String name;
+
+	Martin(String name, double channelSeconds, int sampleRate) {
+		this.name = "Martin " + name;
+		double syncPulseSeconds = 0.004862;
+		double separatorSeconds = 0.000572;
+		double scanLineSeconds = syncPulseSeconds + separatorSeconds + 3 * (channelSeconds + separatorSeconds);
+		scanLineSamples = (int) Math.round(scanLineSeconds * sampleRate);
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public int getScanLineSamples() {
+		return scanLineSamples;
+	}
+}

app/src/main/java/xdsopl/robot36/Mode.java

@@ -0,0 +1,12 @@
+/*
+Mode interface
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public interface Mode {
+	String getName();
+	int getScanLineSamples();
+}

app/src/main/java/xdsopl/robot36/PaulDon.java

@@ -0,0 +1,30 @@
+/*
+PD modes
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class PaulDon implements Mode {
+	private final int scanLineSamples;
+	private final String name;
+
+	PaulDon(String name, double channelSeconds, int sampleRate) {
+		this.name = "PD " + name;
+		double syncPulseSeconds = 0.02;
+		double syncPorchSeconds = 0.00208;
+		double scanLineSeconds = syncPulseSeconds + syncPorchSeconds + 4 * (channelSeconds);
+		scanLineSamples = (int) Math.round(scanLineSeconds * sampleRate);
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public int getScanLineSamples() {
+		return scanLineSamples;
+	}
+}

app/src/main/java/xdsopl/robot36/Raw.java

@@ -0,0 +1,23 @@
+/*
+Raw mode
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class Raw implements Mode {
+
+	Raw() {
+	}
+
+	@Override
+	public String getName() {
+		return "Raw";
+	}
+
+	@Override
+	public int getScanLineSamples() {
+		return -1;
+	}
+}

app/src/main/java/xdsopl/robot36/Robot_36_Color.java

@@ -0,0 +1,32 @@
+/*
+Robot 36 Color
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class Robot_36_Color implements Mode {
+	private final int scanLineSamples;
+
+	Robot_36_Color(int sampleRate) {
+		double syncPulseSeconds = 0.009;
+		double syncPorchSeconds = 0.003;
+		double luminanceSeconds = 0.088;
+		double separatorSeconds = 0.0045;
+		double porchSeconds = 0.0015;
+		double chrominanceSeconds = 0.044;
+		double scanLineSeconds = syncPulseSeconds + syncPorchSeconds + luminanceSeconds + separatorSeconds + porchSeconds + chrominanceSeconds;
+		scanLineSamples = (int) Math.round(scanLineSeconds * sampleRate);
+	}
+
+	@Override
+	public String getName() {
+		return "Robot 36 Color";
+	}
+
+	@Override
+	public int getScanLineSamples() {
+		return scanLineSamples;
+	}
+}

app/src/main/java/xdsopl/robot36/Robot_72_Color.java

@@ -0,0 +1,32 @@
+/*
+Robot 72 Color
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class Robot_72_Color implements Mode {
+	private final int scanLineSamples;
+
+	Robot_72_Color(int sampleRate) {
+		double syncPulseSeconds = 0.009;
+		double syncPorchSeconds = 0.003;
+		double luminanceSeconds = 0.138;
+		double separatorSeconds = 0.0045;
+		double porchSeconds = 0.0015;
+		double chrominanceSeconds = 0.069;
+		double scanLineSeconds = syncPulseSeconds + syncPorchSeconds + luminanceSeconds + 2 * (separatorSeconds + porchSeconds + chrominanceSeconds);
+		scanLineSamples = (int) Math.round(scanLineSeconds * sampleRate);
+	}
+
+	@Override
+	public String getName() {
+		return "Robot 72 Color";
+	}
+
+	@Override
+	public int getScanLineSamples() {
+		return scanLineSamples;
+	}
+}

app/src/main/java/xdsopl/robot36/Scottie.java

@@ -0,0 +1,30 @@
+/*
+Scottie modes
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class Scottie implements Mode {
+	private final int scanLineSamples;
+	private final String name;
+
+	Scottie(String name, double channelSeconds, int sampleRate) {
+		this.name = "Scottie " + name;
+		double syncPulseSeconds = 0.009;
+		double separatorSeconds = 0.0015;
+		double scanLineSeconds = syncPulseSeconds + 3 * (channelSeconds + separatorSeconds);
+		scanLineSamples = (int) Math.round(scanLineSeconds * sampleRate);
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public int getScanLineSamples() {
+		return scanLineSamples;
+	}
+}

app/src/main/java/xdsopl/robot36/Wraase_SC2_180.java

@@ -0,0 +1,29 @@
+/*
+Wraase SC2-180
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class Wraase_SC2_180 implements Mode {
+	private final int scanLineSamples;
+
+	Wraase_SC2_180(int sampleRate) {
+		double syncPulseSeconds = 0.0055225;
+		double syncPorchSeconds = 0.0005;
+		double channelSeconds = 0.235;
+		double scanLineSeconds = syncPulseSeconds + syncPorchSeconds + 3 * channelSeconds;
+		scanLineSamples = (int) Math.round(scanLineSeconds * sampleRate);
+	}
+
+	@Override
+	public String getName() {
+		return "Wraase SC2-180";
+	}
+
+	@Override
+	public int getScanLineSamples() {
+		return scanLineSamples;
+	}
+}