Initial commit

.gitignore

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+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
+
+# User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Mono auto generated files
+mono_crash.*
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# Visual Studio 2015/2017 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# Visual Studio 2017 auto generated files
+Generated\ Files/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUnit
+*.VisualState.xml
+TestResult.xml
+nunit-*.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
+# StyleCop
+StyleCopReport.xml
+
+# Files built by Visual Studio
+*_i.c
+*_p.c
+*_h.h
+*.ilk
+*.meta
+*.obj
+*.iobj
+*.pch
+*.pdb
+*.ipdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*_wpftmp.csproj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# Visual Studio Trace Files
+*.e2e
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# AxoCover is a Code Coverage Tool
+.axoCover/*
+!.axoCover/settings.json
+
+# Coverlet is a free, cross platform Code Coverage Tool

README.md

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+# mono-to-stereo
+
+Takes a mono input and renders it as if it was an interleaved stereo input. Works on MS2109 capture
+devices where the audio input is a 96khz mono stream but in actuality is a 48khz stereo stream with
+the left and right channels swapped. In order to support this device better, swapping the left and
+right channels is done by default.
+
+Original code based off of [Matthew van Eerde's loopback-capture](https://github.com/mvaneerde/blog/tree/master/loopback-capture)
+project.
+
+Run `mono-to-stereo.exe -?` for usage instructions.

loopback-capture.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30309.148
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "mono-to-stereo", "mono-to-stereo\mono-to-stereo.vcxproj", "{4463F7EB-16DC-4C5E-A9CB-9B4E5A18E2E9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Win32 = Debug|Win32
+		Debug|x64 = Debug|x64
+		Release|Win32 = Release|Win32
+		Release|x64 = Release|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{4463F7EB-16DC-4C5E-A9CB-9B4E5A18E2E9}.Debug|Win32.ActiveCfg = Debug|Win32
+		{4463F7EB-16DC-4C5E-A9CB-9B4E5A18E2E9}.Debug|Win32.Build.0 = Debug|Win32
+		{4463F7EB-16DC-4C5E-A9CB-9B4E5A18E2E9}.Debug|x64.ActiveCfg = Debug|x64
+		{4463F7EB-16DC-4C5E-A9CB-9B4E5A18E2E9}.Debug|x64.Build.0 = Debug|x64
+		{4463F7EB-16DC-4C5E-A9CB-9B4E5A18E2E9}.Release|Win32.ActiveCfg = Release|Win32
+		{4463F7EB-16DC-4C5E-A9CB-9B4E5A18E2E9}.Release|Win32.Build.0 = Release|Win32
+		{4463F7EB-16DC-4C5E-A9CB-9B4E5A18E2E9}.Release|x64.ActiveCfg = Release|x64
+		{4463F7EB-16DC-4C5E-A9CB-9B4E5A18E2E9}.Release|x64.Build.0 = Release|x64
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

mono-to-stereo/cleanup.h

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+// cleanup.h
+
+class AudioClientStopOnExit {
+public:
+    AudioClientStopOnExit(IAudioClient *p) : m_p(p) {}
+    ~AudioClientStopOnExit() {
+        HRESULT hr = m_p->Stop();
+        if (FAILED(hr)) {
+            ERR(L"IAudioClient::Stop failed: hr = 0x%08x", hr);
+        }
+    }
+
+private:
+    IAudioClient *m_p;
+};
+
+class AvRevertMmThreadCharacteristicsOnExit {
+public:
+    AvRevertMmThreadCharacteristicsOnExit(HANDLE hTask) : m_hTask(hTask) {}
+    ~AvRevertMmThreadCharacteristicsOnExit() {
+        if (!AvRevertMmThreadCharacteristics(m_hTask)) {
+            ERR(L"AvRevertMmThreadCharacteristics failed: last error is %d", GetLastError());
+        }
+    }
+private:
+    HANDLE m_hTask;
+};
+
+class CancelWaitableTimerOnExit {
+public:
+    CancelWaitableTimerOnExit(HANDLE h) : m_h(h) {}
+    ~CancelWaitableTimerOnExit() {
+        if (!CancelWaitableTimer(m_h)) {
+            ERR(L"CancelWaitableTimer failed: last error is %d", GetLastError());
+        }
+    }
+private:
+    HANDLE m_h;
+};
+
+class CloseHandleOnExit {
+public:
+    CloseHandleOnExit(HANDLE h) : m_h(h) {}
+    ~CloseHandleOnExit() {
+        if (!CloseHandle(m_h)) {
+            ERR(L"CloseHandle failed: last error is %d", GetLastError());
+        }
+    }
+
+private:
+    HANDLE m_h;
+};
+
+class CoTaskMemFreeOnExit {
+public:
+    CoTaskMemFreeOnExit(PVOID p) : m_p(p) {}
+    ~CoTaskMemFreeOnExit() {
+        CoTaskMemFree(m_p);
+    }
+
+private:
+    PVOID m_p;
+};
+
+class CoUninitializeOnExit {
+public:
+    ~CoUninitializeOnExit() {
+        CoUninitialize();
+    }
+};
+
+class PropVariantClearOnExit {
+public:
+    PropVariantClearOnExit(PROPVARIANT *p) : m_p(p) {}
+    ~PropVariantClearOnExit() {
+        HRESULT hr = PropVariantClear(m_p);
+        if (FAILED(hr)) {
+            ERR(L"PropVariantClear failed: hr = 0x%08x", hr);
+        }
+    }
+
+private:
+    PROPVARIANT *m_p;
+};
+
+class ReleaseOnExit {
+public:
+    ReleaseOnExit(IUnknown *p) : m_p(p) {}
+    ~ReleaseOnExit() {
+        m_p->Release();
+    }
+
+private:
+    IUnknown *m_p;
+};
+
+class SetEventOnExit {
+public:
+    SetEventOnExit(HANDLE h) : m_h(h) {}
+    ~SetEventOnExit() {
+        if (!SetEvent(m_h)) {
+            ERR(L"SetEvent failed: last error is %d", GetLastError());
+        }
+    }
+private:
+    HANDLE m_h;
+};
+
+class WaitForSingleObjectOnExit {
+public:
+    WaitForSingleObjectOnExit(HANDLE h) : m_h(h) {}
+    ~WaitForSingleObjectOnExit() {
+        DWORD dwWaitResult = WaitForSingleObject(m_h, INFINITE);
+        if (WAIT_OBJECT_0 != dwWaitResult) {
+            ERR(L"WaitForSingleObject returned unexpected result 0x%08x, last error is %d", dwWaitResult, GetLastError());
+        }
+    }
+
+private:
+    HANDLE m_h;
+};

mono-to-stereo/common.h

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+// common.h
+
+#include <stdio.h>
+#include <windows.h>
+#include <mmsystem.h>
+#include <mmdeviceapi.h>
+#include <audioclient.h>
+#include <avrt.h>
+#include <functiondiscoverykeys_devpkey.h>
+
+#include "log.h"
+#include "cleanup.h"
+#include "prefs.h"
+#include "mono-to-stereo.h"

mono-to-stereo/guid.cpp

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+// guid.cpp
+
+#include <initguid.h>
+#include "common.h"

mono-to-stereo/log.h

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+// log.h
+
+#define LOG(format, ...) wprintf(format L"\n", __VA_ARGS__)
+#define ERR(format, ...) LOG(L"Error: " format, __VA_ARGS__)