diff --git a/idd/LGIdd/LGIdd.vcxproj b/idd/LGIdd/LGIdd.vcxproj
index 010591c2..7a52074a 100644
--- a/idd/LGIdd/LGIdd.vcxproj
+++ b/idd/LGIdd/LGIdd.vcxproj
@@ -121,6 +121,7 @@
     <ClInclude Include="transport\CTransportManager.h" />
     <ClInclude Include="transport\DirectFrameBufferMemory.h" />
     <ClInclude Include="transport\FrameCaps.h" />
+    <ClInclude Include="transport\FrameProfile.h" />
     <ClInclude Include="transport\IControlSink.h" />
     <ClInclude Include="transport\IControlTransport.h" />
     <ClInclude Include="transport\IFrameSink.h" />
diff --git a/idd/LGIdd/LGIdd.vcxproj.filters b/idd/LGIdd/LGIdd.vcxproj.filters
index 32759f45..ea027eb0 100644
--- a/idd/LGIdd/LGIdd.vcxproj.filters
+++ b/idd/LGIdd/LGIdd.vcxproj.filters
@@ -175,6 +175,9 @@
     <ClInclude Include="transport\FrameCaps.h">
       <Filter>Transport</Filter>
     </ClInclude>
+    <ClInclude Include="transport\FrameProfile.h">
+      <Filter>Transport</Filter>
+    </ClInclude>
     <ClInclude Include="transport\IControlSink.h">
       <Filter>Transport</Filter>
     </ClInclude>
diff --git a/idd/LGIdd/transport/FrameProfile.h b/idd/LGIdd/transport/FrameProfile.h
new file mode 100644
index 00000000..7d0bdf51
--- /dev/null
+++ b/idd/LGIdd/transport/FrameProfile.h
@@ -0,0 +1,162 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#pragma once
+
+#include <Windows.h>
+#include <stdint.h>
+
+enum class FrameStorage : uint8_t
+{
+  D3D12_TEXTURE,
+  D3D11_TEXTURE,
+};
+
+enum class GpuMode : uint8_t
+{
+  HARDWARE,
+  SOFTWARE,
+};
+
+enum class FramePixel : uint8_t
+{
+  BGRA8,
+  RGBA8,
+  RGB10A2,
+  RGBA16F,
+};
+
+enum class FrameSignal : uint8_t
+{
+  SRGB,
+  PQ_BT2020,
+  SCRGB_LINEAR,
+};
+
+struct FrameProfile
+{
+  // Transport frame inputs are always Direct3D textures.
+  FrameStorage storage = FrameStorage::D3D12_TEXTURE;
+  FramePixel   pixel   = FramePixel::BGRA8;
+  FrameSignal  signal  = FrameSignal::SRGB;
+};
+
+struct FrameCfg
+{
+  // Software mode still provides a Direct3D texture to the transport.
+  GpuMode     mode    = GpuMode::HARDWARE;
+  LUID        adapter = {};
+  unsigned    width   = 0;
+  unsigned    height  = 0;
+  FrameProfile profile;
+};
+
+namespace Frame
+{
+  inline bool Same(const LUID& left, const LUID& right)
+  {
+    return left.LowPart  == right.LowPart &&
+           left.HighPart == right.HighPart;
+  }
+
+  inline bool Same(const FrameProfile& left, const FrameProfile& right)
+  {
+    return left.storage == right.storage &&
+           left.pixel   == right.pixel   &&
+           left.signal  == right.signal;
+  }
+
+  inline bool Same(const FrameCfg& left, const FrameCfg& right)
+  {
+    return
+      left.mode    == right.mode                         &&
+      Same(left.adapter, right.adapter)                  &&
+      left.width   == right.width                        &&
+      left.height  == right.height                       &&
+      Same(left.profile, right.profile);
+  }
+
+  inline bool Valid(GpuMode mode)
+  {
+    return mode == GpuMode::HARDWARE || mode == GpuMode::SOFTWARE;
+  }
+
+  inline bool Valid(FrameStorage storage)
+  {
+    return storage == FrameStorage::D3D12_TEXTURE ||
+           storage == FrameStorage::D3D11_TEXTURE;
+  }
+
+  inline bool Valid(FramePixel pixel, FrameSignal signal)
+  {
+    switch (signal)
+    {
+      case FrameSignal::SRGB:
+        return pixel == FramePixel::BGRA8 || pixel == FramePixel::RGBA8;
+
+      case FrameSignal::SCRGB_LINEAR:
+        return pixel == FramePixel::RGBA16F;
+
+      case FrameSignal::PQ_BT2020:
+        return pixel == FramePixel::RGB10A2;
+    }
+    return false;
+  }
+
+  inline bool Valid(const FrameProfile& profile)
+  {
+    return Valid(profile.storage) && Valid(profile.pixel, profile.signal);
+  }
+
+  inline bool Can(FrameSignal source, FrameSignal target)
+  {
+    switch (source)
+    {
+      case FrameSignal::SRGB:
+        return target == FrameSignal::SRGB;
+
+      case FrameSignal::SCRGB_LINEAR:
+        return target == FrameSignal::SCRGB_LINEAR ||
+               target == FrameSignal::PQ_BT2020;
+
+      case FrameSignal::PQ_BT2020:
+        return target == FrameSignal::PQ_BT2020;
+    }
+    return false;
+  }
+
+  inline FrameProfile Store(
+    const FrameProfile& profile, FrameStorage storage)
+  {
+    FrameProfile result = profile;
+    result.storage = storage;
+    return result;
+  }
+}
+
+enum class CfgResult : uint8_t
+{
+  ACCEPTED,
+  // The transport declined this profile and permits another candidate.
+  NEXT,
+  REJECTED,
+  RETRY,
+  FAILED,
+};
diff --git a/idd/LGIdd/transport/ITransport.h b/idd/LGIdd/transport/ITransport.h
index c3913fca..a4d5bb60 100644
--- a/idd/LGIdd/transport/ITransport.h
+++ b/idd/LGIdd/transport/ITransport.h
@@ -22,6 +22,7 @@
 
 #include "transport/DirectFrameBufferMemory.h"
 #include "transport/FrameCaps.h"
+#include "transport/FrameProfile.h"
 #include "transport/TransportConfig.h"
 
 #include <memory>