Add support for Generation 5 servers (GFE 2.10.2+)

moonlight-common/src/com/limelight/nvstream/ConnectionContext.java

@@ -14,6 +14,9 @@ public class ConnectionContext {
 	// Gen 4 servers are 2.2.2+
 	public static final int SERVER_GENERATION_4 = 4;	
 	
+	// Gen 5 servers are 2.10.2+
+	public static final int SERVER_GENERATION_5 = 5;
+	
 	public InetAddress serverAddress;
 	public StreamConfiguration streamConfig;
 	public VideoDecoderRenderer videoDecoderRenderer;

moonlight-common/src/com/limelight/nvstream/NvConnection.java

@@ -116,7 +116,7 @@ public class NvConnection {
 				context.connListener.displayMessage("This app requires GeForce Experience 2.2.2 or later. Please upgrade GFE on your PC and try again.");
 				return false;
 			}
-			else if (majorVersion > 4) {
+			else if (majorVersion > 5) {
 				// Warn the user but allow them to continue
 				context.connListener.displayTransientMessage("This version of GFE is not currently supported. You may experience issues until this app is updated.");
 			}
@@ -126,9 +126,12 @@ public class NvConnection {
 				context.serverGeneration = ConnectionContext.SERVER_GENERATION_3;
 				break;
 			case 4:
-			default:
 				context.serverGeneration = ConnectionContext.SERVER_GENERATION_4;
 				break;
+			case 5:
+			default:
+				context.serverGeneration = ConnectionContext.SERVER_GENERATION_5;
+				break;
 			}
 			
 			LimeLog.info("Server major version: "+majorVersion);

moonlight-common/src/com/limelight/nvstream/av/ConnectionStatusListener.java

@@ -7,7 +7,9 @@ public interface ConnectionStatusListener {
 	
 	public void connectionSinkTooSlow(int firstLostFrame, int nextSuccessfulFrame);
 	
-	public void connectionReceivedFrame(int frameIndex);
+	public void connectionReceivedCompleteFrame(int frameIndex);
+	
+	public void connectionSawFrame(int frameIndex);
 	
 	public void connectionLostPackets(int lastReceivedPacket, int nextReceivedPacket);
 }

moonlight-common/src/com/limelight/nvstream/av/video/VideoDepacketizer.java

@@ -43,11 +43,22 @@ public class VideoDepacketizer {
 	private static final int DU_LIMIT = 15;
 	private AbstractPopulatedBufferList<DecodeUnit> decodedUnits;
 	
+	private final int frameHeaderOffset;
+	
 	public VideoDepacketizer(ConnectionContext context, ConnectionStatusListener controlListener, int nominalPacketSize)
 	{
 		this.controlListener = controlListener;
 		this.nominalPacketDataLength = nominalPacketSize - VideoPacket.HEADER_SIZE;
 		
+		if (context.serverGeneration >= ConnectionContext.SERVER_GENERATION_5) {
+			// Gen 5 servers have an 8 byte header in the data portion of the first
+			// packet of each frame
+			frameHeaderOffset = 8;
+		}
+		else {
+			frameHeaderOffset = 0;
+		}
+		
 		boolean unsynchronized;
 		if (context.videoDecoderRenderer != null) {
 			int videoCaps = context.videoDecoderRenderer.getCapabilities();
@@ -177,7 +188,7 @@ public class VideoDepacketizer {
 			// Packets now owned by the DU
 			backingPacketTail = backingPacketHead = null;
 			
-			controlListener.connectionReceivedFrame(frameNumber);
+			controlListener.connectionReceivedCompleteFrame(frameNumber);
 			
 			// Submit the DU to the consumer
 			decodedUnits.addPopulatedObject(du);
@@ -367,6 +378,9 @@ public class VideoDepacketizer {
 			return;
 		}
 		
+		// Notify the listener of the latest frame we've seen from the PC
+		controlListener.connectionSawFrame(frameIndex);
+		
 		// Look for a frame start before receiving a frame end
 		if (firstPacket && decodingFrame)
 		{
@@ -446,6 +460,12 @@ public class VideoDepacketizer {
 		}
 		lastPacketInStream = streamPacketIndex;
 		
+		// If this is the first packet, skip the frame header (if one exists)
+		if (firstPacket) {
+			cachedReassemblyDesc.offset += frameHeaderOffset;
+			cachedReassemblyDesc.length -= frameHeaderOffset;
+		}
+		
 		if (firstPacket && isIdrFrameStart(cachedReassemblyDesc))
 		{
 			// The slow path doesn't update the frame start time by itself

moonlight-common/src/com/limelight/nvstream/control/ControlStream.java

@@ -41,6 +41,13 @@ public class ControlStream implements ConnectionStatusListener {
 		0x060a, // Loss Stats
 		0x0611, // Frame Stats (unused)
 	};
+	private static final short packetTypesGen5[] = {
+		0x0305, // Start A
+		0x0307, // Start B
+		0x0301, // Invalidate reference frames
+		0x0201, // Loss Stats
+		0x0204, // Frame Stats (unused)
+	};
 	
 	private static final short payloadLengthsGen3[] = {
 		-1, // Start A
@@ -56,6 +63,13 @@ public class ControlStream implements ConnectionStatusListener {
 		32, // Loss Stats
 		64, // Frame Stats
 	};
+	private static final short payloadLengthsGen5[] = {
+		-1, // Start A
+		16, // Start B
+		24, // Invalidate reference frames
+		32, // Loss Stats
+		80, // Frame Stats
+	};
 	
 	private static final byte[] precontructedPayloadsGen3[] = {
 		new byte[]{0}, // Start A
@@ -71,10 +85,18 @@ public class ControlStream implements ConnectionStatusListener {
 		null, // Loss Stats
 		null, // Frame Stats
 	};
+	private static final byte[] precontructedPayloadsGen5[] = {
+		new byte[]{0, 0}, // Start A
+		null, // Start B
+		null, // Invalidate reference frames
+		null, // Loss Stats
+		null, // Frame Stats
+	};
 	
 	public static final int LOSS_REPORT_INTERVAL_MS = 50;
 	
-	private int currentFrame;
+	private int lastGoodFrame;
+	private int lastSeenFrame;
 	private int lossCountSinceLastReport;
 	
 	private ConnectionContext context;
@@ -121,11 +143,16 @@ public class ControlStream implements ConnectionStatusListener {
 			preconstructedPayloads = precontructedPayloadsGen3;
 			break;
 		case ConnectionContext.SERVER_GENERATION_4:
-		default:
 			packetTypes = packetTypesGen4;
 			payloadLengths = payloadLengthsGen4;
 			preconstructedPayloads = precontructedPayloadsGen4;
 			break;
+		case ConnectionContext.SERVER_GENERATION_5:
+		default:
+			packetTypes = packetTypesGen5;
+			payloadLengths = payloadLengthsGen5;
+			preconstructedPayloads = precontructedPayloadsGen5;
+			break;
 		}
 		
 		if (context.videoDecoderRenderer != null) {
@@ -164,7 +191,7 @@ public class ControlStream implements ConnectionStatusListener {
 		bb.putInt(lossCountSinceLastReport); // Packet loss count
 		bb.putInt(LOSS_REPORT_INTERVAL_MS); // Time since last report in milliseconds
 		bb.putInt(1000);
-		bb.putLong(currentFrame); // Last successfully received frame
+		bb.putLong(lastGoodFrame); // Last successfully received frame
 		bb.putInt(0);
 		bb.putInt(0);
 		bb.putInt(0x14);
@@ -315,7 +342,8 @@ public class ControlStream implements ConnectionStatusListener {
 	
 	private ControlStream.NvCtlResponse doStartB() throws IOException
 	{
-		if (context.serverGeneration == ConnectionContext.SERVER_GENERATION_3) {
+		// Gen 3 and 5 both use a packet of this form
+		if (context.serverGeneration != ConnectionContext.SERVER_GENERATION_4) {
 	        ByteBuffer payload = ByteBuffer.wrap(new byte[payloadLengths[IDX_START_B]]).order(ByteOrder.LITTLE_ENDIAN);
 	        
 	        payload.putInt(0);
@@ -334,16 +362,28 @@ public class ControlStream implements ConnectionStatusListener {
 	}
 	
 	private void requestIdrFrame() throws IOException {
-		// On Gen 3, we use the invalidate reference frames trick which works for about 5 hours of streaming at 60 FPS
+		// On Gen 3, we use the invalidate reference frames trick.
 		// On Gen 4+, we use the known IDR frame request packet
+		// On Gen 5, we're currently using the invalidate reference frames trick again.
 		
-		if (context.serverGeneration == ConnectionContext.SERVER_GENERATION_3) {
+		if (context.serverGeneration != ConnectionContext.SERVER_GENERATION_4) {
 			ByteBuffer conf = ByteBuffer.wrap(new byte[payloadLengths[IDX_INVALIDATE_REF_FRAMES]]).order(ByteOrder.LITTLE_ENDIAN);
 			
 			//conf.putLong(firstLostFrame);
 			//conf.putLong(nextSuccessfulFrame);
-			conf.putLong(0);
-			conf.putLong(0xFFFFF);
+			
+			// Early on, we'll use a special IDR sequence. Otherwise,
+			// we'll just say we lost the last 32 frames. This is larger
+			// than the number of buffered frames in the encoder (16) so
+			// it should trigger an IDR frame.
+			if (lastSeenFrame < 0x20) {
+				conf.putLong(0);
+				conf.putLong(0x20);
+			}
+			else {
+				conf.putLong(lastSeenFrame - 0x20);
+				conf.putLong(lastSeenFrame);
+			}
 			conf.putLong(0);
 			
 			sendAndGetReply(new NvCtlPacket(packetTypes[IDX_INVALIDATE_REF_FRAMES],
@@ -534,7 +574,7 @@ public class ControlStream implements ConnectionStatusListener {
 		
 		// Suppress connection warnings for the first 150 frames to allow the connection
 		// to stabilize
-		if (currentFrame < 150) {
+		if (lastGoodFrame < 150) {
 			return;
 		}
 		
@@ -569,7 +609,7 @@ public class ControlStream implements ConnectionStatusListener {
 		
 		// Suppress connection warnings for the first 150 frames to allow the connection
 		// to stabilize
-		if (currentFrame < 150) {
+		if (lastGoodFrame < 150) {
 			return;
 		}
 		
@@ -579,8 +619,12 @@ public class ControlStream implements ConnectionStatusListener {
 		}
 	}
 
-	public void connectionReceivedFrame(int frameIndex) {
-		currentFrame = frameIndex;
+	public void connectionReceivedCompleteFrame(int frameIndex) {
+		lastGoodFrame = frameIndex;
+	}
+	
+	public void connectionSawFrame(int frameIndex) {
+		lastSeenFrame = frameIndex;
 	}
 
 	public void connectionLostPackets(int lastReceivedPacket, int nextReceivedPacket) {

moonlight-common/src/com/limelight/nvstream/input/ControllerStream.java

@@ -271,7 +271,7 @@ public class ControllerStream {
 		}
 		else {
 			// Use multi-controller packets for generation 4 and above
-			queuePacket(new MultiControllerPacket((short) 0, buttonFlags, leftTrigger,
+			queuePacket(new MultiControllerPacket(context, (short) 0, buttonFlags, leftTrigger,
 					rightTrigger, leftStickX, leftStickY,
 					rightStickX, rightStickY));
 		}
@@ -288,7 +288,7 @@ public class ControllerStream {
 		}
 		else {
 			// Use multi-controller packets for generation 4 and above
-			queuePacket(new MultiControllerPacket(controllerNumber, buttonFlags, leftTrigger,
+			queuePacket(new MultiControllerPacket(context, controllerNumber, buttonFlags, leftTrigger,
 					rightTrigger, leftStickX, leftStickY,
 					rightStickX, rightStickY));
 		}
@@ -296,17 +296,17 @@ public class ControllerStream {
 	
 	public void sendMouseButtonDown(byte mouseButton)
 	{
-		queuePacket(new MouseButtonPacket(true, mouseButton));
+		queuePacket(new MouseButtonPacket(context, true, mouseButton));
 	}
 	
 	public void sendMouseButtonUp(byte mouseButton)
 	{
-		queuePacket(new MouseButtonPacket(false, mouseButton));
+		queuePacket(new MouseButtonPacket(context, false, mouseButton));
 	}
 	
 	public void sendMouseMove(short deltaX, short deltaY)
 	{
-		queuePacket(new MouseMovePacket(deltaX, deltaY));
+		queuePacket(new MouseMovePacket(context, deltaX, deltaY));
 	}
 	
 	public void sendKeyboardInput(short keyMap, byte keyDirection, byte modifier) 
@@ -316,6 +316,6 @@ public class ControllerStream {
 	
 	public void sendMouseScroll(byte scrollClicks)
 	{
-		queuePacket(new MouseScrollPacket(scrollClicks));
+		queuePacket(new MouseScrollPacket(context, scrollClicks));
 	}
 }

moonlight-common/src/com/limelight/nvstream/input/KeyboardPacket.java

@@ -14,9 +14,9 @@ public class KeyboardPacket extends InputPacket {
 	public static final byte MODIFIER_CTRL = 0x02;
 	public static final byte MODIFIER_ALT = 0x04;
 	
-	short keyCode;
-	byte keyDirection;
-	byte modifier;
+	private short keyCode;
+	private byte keyDirection;
+	private byte modifier;
 	
 	public KeyboardPacket(short keyCode, byte keyDirection, byte modifier) {
 		super(PACKET_TYPE);

moonlight-common/src/com/limelight/nvstream/input/MouseButtonPacket.java

@@ -3,6 +3,8 @@ package com.limelight.nvstream.input;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 
+import com.limelight.nvstream.ConnectionContext;
+
 public class MouseButtonPacket extends InputPacket {
 	
 	byte buttonEventType;
@@ -20,7 +22,7 @@ public class MouseButtonPacket extends InputPacket {
 	public static final byte BUTTON_MIDDLE = 0x02;
 	public static final byte BUTTON_RIGHT = 0x03;
 	
-	public MouseButtonPacket(boolean buttonDown, byte mouseButton)
+	public MouseButtonPacket(ConnectionContext context, boolean buttonDown, byte mouseButton)
 	{
 		super(PACKET_TYPE);
 		
@@ -28,6 +30,11 @@ public class MouseButtonPacket extends InputPacket {
 				
 		buttonEventType = buttonDown ?
 				PRESS_EVENT : RELEASE_EVENT;
+		
+		// On Gen 5 servers, the button event codes are incremented by one
+		if (context.serverGeneration >= ConnectionContext.SERVER_GENERATION_5) {
+			buttonEventType++;
+		}
 	}
 
 	@Override

moonlight-common/src/com/limelight/nvstream/input/MouseMovePacket.java

@@ -3,36 +3,40 @@ package com.limelight.nvstream.input;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 
-public class MouseMovePacket extends InputPacket {
-	
-	private static final byte[] HEADER =
-		{
-		0x06,
-		0x00,
-		0x00,
-		0x00
-		};
+import com.limelight.nvstream.ConnectionContext;
 
-	public static final int PACKET_TYPE = 0x8;
-	public static final int PAYLOAD_LENGTH = 8;
-	public static final int PACKET_LENGTH = PAYLOAD_LENGTH +
+public class MouseMovePacket extends InputPacket {
+	private static final int HEADER_CODE = 0x06;
+	private static final int PACKET_TYPE = 0x8;
+	private static final int PAYLOAD_LENGTH = 8;
+	private static final int PACKET_LENGTH = PAYLOAD_LENGTH +
 		InputPacket.HEADER_LENGTH;
 	
+	private int headerCode; 
+	
+	// Accessed in ControllerStream for batching
 	short deltaX;
 	short deltaY;
 	
-	public MouseMovePacket(short deltaX, short deltaY)
+	public MouseMovePacket(ConnectionContext context, short deltaX, short deltaY)
 	{
 		super(PACKET_TYPE);
 		
+		this.headerCode = HEADER_CODE;
+		
+		// On Gen 5 servers, the header code is incremented by one
+		if (context.serverGeneration >= ConnectionContext.SERVER_GENERATION_5) {
+			headerCode++;
+		}
+		
 		this.deltaX = deltaX;
 		this.deltaY = deltaY;
 	}
 
 	@Override
 	public void toWirePayload(ByteBuffer bb) {
+		bb.order(ByteOrder.LITTLE_ENDIAN).putInt(headerCode);
 		bb.order(ByteOrder.BIG_ENDIAN);
-		bb.put(HEADER);
 		bb.putShort(deltaX);
 		bb.putShort(deltaY);
 	}

moonlight-common/src/com/limelight/nvstream/input/MouseScrollPacket.java

@@ -3,28 +3,38 @@ package com.limelight.nvstream.input;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 
+import com.limelight.nvstream.ConnectionContext;
+
 public class MouseScrollPacket extends InputPacket {
+	private static final int HEADER_CODE = 0x09;
 	private static final int PACKET_TYPE = 0xa;
 	private static final int PAYLOAD_LENGTH = 10;
 	private static final int PACKET_LENGTH = PAYLOAD_LENGTH +
 		InputPacket.HEADER_LENGTH;
 	
-	short scroll;
 	
-	public MouseScrollPacket(byte scrollClicks)
+	private int headerCode;
+	private short scroll;
+	
+	public MouseScrollPacket(ConnectionContext context, byte scrollClicks)
 	{
 		super(PACKET_TYPE);
+		
+		this.headerCode = HEADER_CODE;
+		
+		// On Gen 5 servers, the header code is incremented by one
+		if (context.serverGeneration >= ConnectionContext.SERVER_GENERATION_5) {
+			headerCode++;
+		}
+		
 		this.scroll = (short)(scrollClicks * 120);
 	}
 
 	@Override
-	public void toWirePayload(ByteBuffer bb) {
-		bb.order(ByteOrder.BIG_ENDIAN);
+	public void toWirePayload(ByteBuffer bb) {		
+		bb.order(ByteOrder.LITTLE_ENDIAN).putInt(headerCode);
 		
-		bb.put((byte) 0x09);
-		bb.put((byte) 0);
-		bb.put((byte) 0);
-		bb.put((byte) 0);
+		bb.order(ByteOrder.BIG_ENDIAN);
 		
 		bb.putShort(scroll);
 		bb.putShort(scroll);

moonlight-common/src/com/limelight/nvstream/input/MultiControllerPacket.java

@@ -3,6 +3,8 @@ package com.limelight.nvstream.input;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 
+import com.limelight.nvstream.ConnectionContext;
+
 public class MultiControllerPacket extends InputPacket {
 		private static final byte[] TAIL =
 			{
@@ -14,6 +16,7 @@ public class MultiControllerPacket extends InputPacket {
 				0x00
 			};
 		
+		private static final int HEADER_CODE = 0x0d;
 		private static final int PACKET_TYPE = 0x1e;
 		
 		private static final short PAYLOAD_LENGTH = 30;
@@ -29,12 +32,22 @@ public class MultiControllerPacket extends InputPacket {
 		short rightStickX;
 		short rightStickY;
 		
-		public MultiControllerPacket(short controllerNumber, short buttonFlags, byte leftTrigger, byte rightTrigger,
+		private int headerCode;
+		
+		public MultiControllerPacket(ConnectionContext context, 
+				short controllerNumber, short buttonFlags, byte leftTrigger, byte rightTrigger,
 				 short leftStickX, short leftStickY,
 				 short rightStickX, short rightStickY)
 		{
 			super(PACKET_TYPE);
 			
+			this.headerCode = HEADER_CODE;
+			
+			// On Gen 5 servers, the header code is decremented by one
+			if (context.serverGeneration >= ConnectionContext.SERVER_GENERATION_5) {
+				headerCode--;
+			}
+			
 			this.controllerNumber = controllerNumber;
 			
 			this.buttonFlags = buttonFlags;
@@ -72,7 +85,7 @@ public class MultiControllerPacket extends InputPacket {
 		@Override
 		public void toWirePayload(ByteBuffer bb) {
 			bb.order(ByteOrder.LITTLE_ENDIAN);
-			bb.putInt(0xd);
+			bb.putInt(headerCode);
 			bb.putShort((short) 0x1a);
 			bb.putShort(controllerNumber);
 			bb.putShort((short) 0x0f); // Active controller flags

moonlight-common/src/com/limelight/nvstream/rtsp/RtspConnection.java

@@ -40,8 +40,10 @@ public class RtspConnection {
 		case ConnectionContext.SERVER_GENERATION_3:
 			return 10;
 		case ConnectionContext.SERVER_GENERATION_4:
-		default:
 			return 11;
+		case ConnectionContext.SERVER_GENERATION_5:
+		default:
+			return 12;
 		}
 	}
 

moonlight-common/src/com/limelight/nvstream/rtsp/SdpGenerator.java

@@ -53,37 +53,16 @@ public class SdpGenerator {
 	
 	private static void addGen4Attributes(StringBuilder config, ConnectionContext context) {
 		addSessionAttribute(config, "x-nv-general.serverAddress", "rtsp://"+context.serverAddress.getHostAddress()+":48010");
-
-		// If client and server are able, request HEVC
-		if (context.negotiatedVideoFormat == VideoFormat.H265) {
-			addSessionAttribute(config, "x-nv-clientSupportHevc", "1");
-			addSessionAttribute(config, "x-nv-vqos[0].bitStreamFormat", "1");
-			
-			// Disable slicing on HEVC
-			addSessionAttribute(config, "x-nv-video[0].videoEncoderSlicesPerFrame", "1");
-		}
-		else {
-			// Otherwise, use AVC
-			addSessionAttribute(config, "x-nv-clientSupportHevc", "0");
-			addSessionAttribute(config, "x-nv-vqos[0].bitStreamFormat", "0");
-			
-			// Use slicing for increased performance on some decoders
-			addSessionAttribute(config, "x-nv-video[0].videoEncoderSlicesPerFrame", "4");
-		}
 		
 		addSessionAttribute(config, "x-nv-video[0].rateControlMode", "4");
+	}
+	
+	private static void addGen5Attributes(StringBuilder config, ConnectionContext context) {
+		// We want to use the legacy TCP connections for control and input rather than the new UDP stuff
+		addSessionAttribute(config, "x-nv-general.useReliableUdp", "0");
+		addSessionAttribute(config, "x-nv-ri.useControlChannel", "0");
 		
-
-		
-		// Enable surround sound if configured for it
-		addSessionAttribute(config, "x-nv-audio.surround.numChannels", ""+context.streamConfig.getAudioChannelCount());
-		addSessionAttribute(config, "x-nv-audio.surround.channelMask", ""+context.streamConfig.getAudioChannelMask());
-		if (context.streamConfig.getAudioChannelCount() > 2) {
-			addSessionAttribute(config, "x-nv-audio.surround.enable", "1");
-		}
-		else {
-			addSessionAttribute(config, "x-nv-audio.surround.enable", "0");
-		}
+		addSessionAttribute(config, "x-nv-vqos[0].enableQec", "0");
 	}
 	
 	public static String generateSdpFromContext(ConnectionContext context) {
@@ -116,11 +95,6 @@ public class SdpGenerator {
 		
 		addSessionAttribute(config, "x-nv-video[0].packetSize", ""+context.streamConfig.getMaxPacketSize());
 		
-		if (context.streamConfig.getRemote()) {
-			addSessionAttribute(config, "x-nv-video[0].averageBitrate", "4");
-			addSessionAttribute(config, "x-nv-video[0].peakBitrate", "4");
-		}
-		
 		addSessionAttribute(config, "x-nv-video[0].timeoutLengthMs", "7000");
 		addSessionAttribute(config, "x-nv-video[0].framesWithInvalidRefThreshold", "0");
 		
@@ -135,11 +109,22 @@ public class SdpGenerator {
 			bitrate = context.streamConfig.getBitrate();
 		}
 		
-		// We don't support dynamic bitrate scaling properly (it tends to bounce between min and max and never
-		// settle on the optimal bitrate if it's somewhere in the middle), so we'll just latch the bitrate
-		// to the requested value.
-		addSessionAttribute(config, "x-nv-vqos[0].bw.minimumBitrate", ""+bitrate);
-		addSessionAttribute(config, "x-nv-vqos[0].bw.maximumBitrate", ""+bitrate);
+		if (context.serverGeneration >= ConnectionContext.SERVER_GENERATION_5) {
+			addSessionAttribute(config, "x-nv-vqos[0].bw.minimumBitrateKbps", ""+bitrate);
+			addSessionAttribute(config, "x-nv-vqos[0].bw.maximumBitrateKbps", ""+bitrate);
+		}
+		else {
+			if (context.streamConfig.getRemote()) {
+				addSessionAttribute(config, "x-nv-video[0].averageBitrate", "4");
+				addSessionAttribute(config, "x-nv-video[0].peakBitrate", "4");
+			}
+			
+			// We don't support dynamic bitrate scaling properly (it tends to bounce between min and max and never
+			// settle on the optimal bitrate if it's somewhere in the middle), so we'll just latch the bitrate
+			// to the requested value.
+			addSessionAttribute(config, "x-nv-vqos[0].bw.minimumBitrate", ""+bitrate);
+			addSessionAttribute(config, "x-nv-vqos[0].bw.maximumBitrate", ""+bitrate);
+		}
 		
 		// Using FEC turns padding on which makes us have to take the slow path
 		// in the depacketizer, not to mention exposing some ambiguous cases with
@@ -170,9 +155,42 @@ public class SdpGenerator {
 			break;
 			
 		case ConnectionContext.SERVER_GENERATION_4:
-		default:
 			addGen4Attributes(config, context);
 			break;
+		case ConnectionContext.SERVER_GENERATION_5:
+		default:
+			addGen5Attributes(config, context);
+			break;
+		}
+		
+		// Gen 4+ supports H.265 and surround sound
+		if (context.serverGeneration >= ConnectionContext.SERVER_GENERATION_4) {
+			// If client and server are able, request HEVC
+			if (context.negotiatedVideoFormat == VideoFormat.H265) {
+				addSessionAttribute(config, "x-nv-clientSupportHevc", "1");
+				addSessionAttribute(config, "x-nv-vqos[0].bitStreamFormat", "1");
+				
+				// Disable slicing on HEVC
+				addSessionAttribute(config, "x-nv-video[0].videoEncoderSlicesPerFrame", "1");
+			}
+			else {
+				// Otherwise, use AVC
+				addSessionAttribute(config, "x-nv-clientSupportHevc", "0");
+				addSessionAttribute(config, "x-nv-vqos[0].bitStreamFormat", "0");
+				
+				// Use slicing for increased performance on some decoders
+				addSessionAttribute(config, "x-nv-video[0].videoEncoderSlicesPerFrame", "4");
+			}
+			
+			// Enable surround sound if configured for it
+			addSessionAttribute(config, "x-nv-audio.surround.numChannels", ""+context.streamConfig.getAudioChannelCount());
+			addSessionAttribute(config, "x-nv-audio.surround.channelMask", ""+context.streamConfig.getAudioChannelMask());
+			if (context.streamConfig.getAudioChannelCount() > 2) {
+				addSessionAttribute(config, "x-nv-audio.surround.enable", "1");
+			}
+			else {
+				addSessionAttribute(config, "x-nv-audio.surround.enable", "0");
+			}
 		}
 
 		config.append("t=0 0").append("\r\n");