From 037347b79de1d41ddc0330cd195a99f7cf6b9567 Mon Sep 17 00:00:00 2001
From: Alex Marsev <alex.marsev@gmail.com>
Date: Sun, 7 Feb 2016 23:54:44 +0300
Subject: Check if event mode is supported before using it

---
 src/AudioDevice.h          |  2 ++
 src/AudioDeviceManager.cpp | 10 +++++++++-
 src/Utils.h                | 10 ++++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/AudioDevice.h b/src/AudioDevice.h
index 3c73970..40e6c2d 100644
--- a/src/AudioDevice.h
+++ b/src/AudioDevice.h
@@ -11,6 +11,8 @@ namespace SaneAudioRenderer
         SharedString          adapterName;
         SharedString          endpointName;
         UINT32                endpointFormFactor;
+        bool                  supportsSharedEventMode;
+        bool                  supportsExclusiveEventMode;
 
         IAudioClientPtr       audioClient;
         IAudioRenderClientPtr audioRenderClient;
diff --git a/src/AudioDeviceManager.cpp b/src/AudioDeviceManager.cpp
index 8d7b357..9ac1c52 100644
--- a/src/AudioDeviceManager.cpp
+++ b/src/AudioDeviceManager.cpp
@@ -135,6 +135,13 @@ namespace SaneAudioRenderer
             };
             backend.endpointFormFactor = GetDevicePropertyUint(devicePropertyStore, formFactorKey);
 
+            static const PROPERTYKEY supportsEventModeKey = { // PKEY_AudioEndpoint_Supports_EventDriven_Mode
+                {0x1da5d803, 0xd492, 0x4edd, {0x8c, 0x23, 0xe0, 0xc0, 0xff, 0xee, 0x7f, 0x0e}}, 7
+            };
+            backend.supportsSharedEventMode = IsWindows7OrGreater();
+            backend.supportsExclusiveEventMode = backend.supportsSharedEventMode &&
+                                                 GetDevicePropertyUint(devicePropertyStore, supportsEventModeKey);
+
             ThrowIfFailed(device->Activate(__uuidof(IAudioClient),
                                            CLSCTX_INPROC_SERVER, nullptr, (void**)&backend.audioClient));
         }
@@ -336,7 +343,8 @@ namespace SaneAudioRenderer
                     }
                 }
 
-                backend->eventMode = realtime || backend->exclusive;
+                backend->eventMode = (realtime && backend->supportsSharedEventMode) ||
+                                     (backend->exclusive && backend->supportsExclusiveEventMode);
 
                 {
                     AUDCLNT_SHAREMODE mode = backend->exclusive ? AUDCLNT_SHAREMODE_EXCLUSIVE :
diff --git a/src/Utils.h b/src/Utils.h
index 053eda3..94aec10 100644
--- a/src/Utils.h
+++ b/src/Utils.h
@@ -145,4 +145,14 @@ namespace SaneAudioRenderer
         HMODULE m_lib = NULL;
         Func m_func = nullptr;
     };
+
+    inline bool IsWindows7OrGreater()
+    {
+        OSVERSIONINFOEX info = {sizeof(info)};
+        info.dwMajorVersion = 6;
+        info.dwMinorVersion = 1;
+        auto rule = VerSetConditionMask(VerSetConditionMask(0, VER_MAJORVERSION, VER_GREATER_EQUAL),
+                                                               VER_MINORVERSION, VER_GREATER_EQUAL);
+        return !!VerifyVersionInfo(&info, VER_MAJORVERSION | VER_MINORVERSION, rule);
+    }
 }
-- 
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