From 933813af6b1d3b9580bfd6df8ca759c840423ac8 Mon Sep 17 00:00:00 2001
From: Crend King <975235+CrendKing@users.noreply.github.com>
Date: Fri, 9 Apr 2021 05:37:45 -0700
Subject: [PATCH] Fix bug of not reloading the avs script in
 InputToOutputMediaType(), which desyncs the two avs cript instances

---
 avisynth_filter/src/allocator.cpp     |  9 +++----
 avisynth_filter/src/avs_handler.cpp   | 10 ++++++++
 avisynth_filter/src/avs_handler.h     |  5 ++--
 avisynth_filter/src/filter.cpp        | 36 +++++++++++++--------------
 avisynth_filter/src/filter.h          | 13 +++++++---
 avisynth_filter/src/format.cpp        |  6 ++---
 avisynth_filter/src/frame_handler.cpp | 18 ++++++--------
 avisynth_filter/src/frame_handler.h   |  2 +-
 avisynth_filter/src/input_pin.cpp     |  4 +--
 avisynth_filter/src/prop_settings.cpp |  3 +--
 avisynth_filter/src/registry.cpp      |  4 +--
 avisynth_filter/src/util.h            | 10 +++-----
 12 files changed, 61 insertions(+), 59 deletions(-)

diff --git a/avisynth_filter/src/allocator.cpp b/avisynth_filter/src/allocator.cpp
index 3a1a3aa..fa31cea 100644
--- a/avisynth_filter/src/allocator.cpp
+++ b/avisynth_filter/src/allocator.cpp
@@ -42,8 +42,7 @@ auto CAviSynthFilterAllocator::Alloc() -> HRESULT {
     }
 
     if (m_lAlignment > 1) {
-        const LONG lRemainder = lAlignedSize % m_lAlignment;
-        if (lRemainder != 0) {
+        if (const LONG lRemainder = lAlignedSize % m_lAlignment; lRemainder != 0) {
             const LONG lNewSize = lAlignedSize + m_lAlignment - lRemainder;
             if (lNewSize < lAlignedSize) {
                 return E_OUTOFMEMORY;
@@ -68,12 +67,10 @@ auto CAviSynthFilterAllocator::Alloc() -> HRESULT {
         return E_OUTOFMEMORY;
     }
 
-    LPBYTE pNext = m_pBuffer;
-    CMediaSample *pSample;
-
     ASSERT(m_lAllocated == 0);
 
-    for (; m_lAllocated < m_lCount; m_lAllocated++, pNext += lAlignedSize) {
+    LPBYTE pNext = m_pBuffer;
+    for (CMediaSample *pSample; m_lAllocated < m_lCount; m_lAllocated++, pNext += lAlignedSize) {
         pSample = new CAviSynthFilterMediaSample(
             NAME("AviSynthFilter memory media sample"),
             this,
diff --git a/avisynth_filter/src/avs_handler.cpp b/avisynth_filter/src/avs_handler.cpp
index 542121c..c14a663 100644
--- a/avisynth_filter/src/avs_handler.cpp
+++ b/avisynth_filter/src/avs_handler.cpp
@@ -140,6 +140,16 @@ AvsHandler::CheckingScriptInstance::CheckingScriptInstance(AvsHandler &handler)
     : ScriptInstance(handler) {
 }
 
+auto AvsHandler::CheckingScriptInstance::ReloadScript(const AM_MEDIA_TYPE &mediaType, bool ignoreDisconnect) -> bool {
+    if (__super::ReloadScript(mediaType, ignoreDisconnect)) {
+        StopScript();
+
+        return true;
+    }
+
+    return false;
+}
+
 /**
  * Create media type based on a template while changing its subtype. Also change fields in format if necessary.
  *
diff --git a/avisynth_filter/src/avs_handler.h b/avisynth_filter/src/avs_handler.h
index a0522e0..fc692f1 100644
--- a/avisynth_filter/src/avs_handler.h
+++ b/avisynth_filter/src/avs_handler.h
@@ -27,7 +27,7 @@ class AvsHandler {
         AvsHandler &_handler;
         IScriptEnvironment *_env;
         PClip _scriptClip = nullptr;
-        VideoInfo _scriptVideoInfo;
+        VideoInfo _scriptVideoInfo = {};
         REFERENCE_TIME _scriptAvgFrameDuration = 0;
         std::string _errorString;
 
@@ -52,6 +52,7 @@ class AvsHandler {
     public:
         explicit CheckingScriptInstance(AvsHandler &handler);
 
+        auto ReloadScript(const AM_MEDIA_TYPE &mediaType, bool ignoreDisconnect) -> bool;
         auto GenerateMediaType(const Format::PixelFormat &pixelFormat, const AM_MEDIA_TYPE *templateMediaType) const -> CMediaType;
         constexpr auto GetScriptPixelType() const -> int { return _scriptVideoInfo.pixel_type;}
     };
@@ -81,7 +82,7 @@ class AvsHandler {
     const char *_versionString;
 
     std::filesystem::path _scriptPath = g_env.GetAvsPath();
-    VideoInfo _sourceVideoInfo;
+    VideoInfo _sourceVideoInfo = {};
     PClip _sourceClip = new SourceClip(_sourceVideoInfo);
     PVideoFrame _sourceDrainFrame = nullptr;
     REFERENCE_TIME _sourceAvgFrameDuration = 0;
diff --git a/avisynth_filter/src/filter.cpp b/avisynth_filter/src/filter.cpp
index cd1de80..4d28bdc 100644
--- a/avisynth_filter/src/filter.cpp
+++ b/avisynth_filter/src/filter.cpp
@@ -78,10 +78,10 @@ auto CAviSynthFilter::CheckConnect(PIN_DIRECTION direction, IPin *pPin) -> HRESU
         while (true) {
             hr = enumTypes->Next(1, &nextType, nullptr);
             if (hr == S_OK) {
-                const UniqueMediaTypePtr nextTypePtr(nextType);
+                const SharedMediaTypePtr nextTypePtr(nextType, MediaTypeDeleter);
 
                 if (const Format::PixelFormat *optInputPixelFormat = GetInputPixelFormat(nextType);
-                    optInputPixelFormat && std::ranges::find(_compatibleMediaTypes, *static_cast<CMediaType *>(nextType), &MediaTypePair::input) == _compatibleMediaTypes.cend()) {
+                    optInputPixelFormat && std::ranges::find(_compatibleMediaTypes, optInputPixelFormat, &MediaTypePair::inputFormat) == _compatibleMediaTypes.cend()) {
                     // invoke AviSynth script with each supported input pixel format, and observe the output avs type
                     if (!g_avs->GetCheckingScriptInstance().ReloadScript(*nextType, _remoteControl.has_value())) {
                         g_env.Log(L"Disconnect due to AvsFilterDisconnect()");
@@ -91,7 +91,8 @@ auto CAviSynthFilter::CheckConnect(PIN_DIRECTION direction, IPin *pPin) -> HRESU
 
                     // all media types that share the same avs type are acceptable for output pin connection
                     for (const Format::PixelFormat &avsPixelFormat : Format::LookupAvsType(g_avs->GetCheckingScriptInstance().GetScriptPixelType())) {
-                        _compatibleMediaTypes.emplace_back(*nextType, g_avs->GetCheckingScriptInstance().GenerateMediaType(avsPixelFormat, nextType));
+                        const CMediaType outputType = g_avs->GetCheckingScriptInstance().GenerateMediaType(avsPixelFormat, nextType);
+                        _compatibleMediaTypes.emplace_back(nextTypePtr, optInputPixelFormat, outputType, MediaTypeToPixelFormat(&outputType));
                         g_env.Log(L"Add compatible formats: input %s output %s", optInputPixelFormat->name.c_str(), avsPixelFormat.name.c_str());
                     }
                 }
@@ -109,8 +110,7 @@ auto CAviSynthFilter::CheckConnect(PIN_DIRECTION direction, IPin *pPin) -> HRESU
 auto CAviSynthFilter::CheckInputType(const CMediaType *mtIn) -> HRESULT {
     if (const Format::PixelFormat *optInputPixelFormat = MediaTypeToPixelFormat(mtIn);
         optInputPixelFormat && std::ranges::any_of(_compatibleMediaTypes,
-                                                   [optInputPixelFormat](const Format::PixelFormat *optCompatibleFormatName) -> bool { return optInputPixelFormat == optCompatibleFormatName; },
-                                                   [](const MediaTypePair &pair) -> const Format::PixelFormat * { return MediaTypeToPixelFormat(&pair.input); })) {
+                                                   [optInputPixelFormat](const MediaTypePair &pair) -> bool { return optInputPixelFormat == pair.inputFormat; })) {
         return S_OK;
     }
 
@@ -130,7 +130,7 @@ auto CAviSynthFilter::GetMediaType(int iPosition, CMediaType *pMediaType) -> HRE
         return VFW_S_NO_MORE_ITEMS;
     }
 
-    *pMediaType = _compatibleMediaTypes[iPosition].output;
+    *pMediaType = _compatibleMediaTypes[iPosition].outputType;
     g_env.Log(L"GetMediaType() offer media type %d with %s", iPosition, MediaTypeToPixelFormat(pMediaType)->name.c_str());
 
     return S_OK;
@@ -141,8 +141,6 @@ auto CAviSynthFilter::CheckTransform(const CMediaType *mtIn, const CMediaType *m
     bool isOutputTypeOk = mtOut == &m_pOutput->CurrentMediaType();
 
     if (!isInputTypeOk) {
-        g_avs->GetCheckingScriptInstance().ReloadScript(*mtIn, true);
-
         isInputTypeOk = std::ranges::any_of(InputToOutputMediaType(mtIn), [this](const CMediaType &newOutputType) -> bool {
             return m_pOutput->GetConnected()->QueryAccept(&newOutputType) == S_OK;
         });
@@ -151,15 +149,15 @@ auto CAviSynthFilter::CheckTransform(const CMediaType *mtIn, const CMediaType *m
     }
 
     if (!isOutputTypeOk) {
-        if (const Format::PixelFormat *optOutputPixelFormat = MediaTypeToPixelFormat(mtOut)) {
+        const Format::PixelFormat *optInputPixelFormat = MediaTypeToPixelFormat(mtIn);
+        const Format::PixelFormat *optOutputPixelFormat = MediaTypeToPixelFormat(mtOut);
+        if (optInputPixelFormat && optOutputPixelFormat) {
             const auto &iter = std::ranges::find_if(_compatibleMediaTypes,
-                                                    [&optOutputPixelFormat](const Format::PixelFormat *optCompatiblePixelFormat) -> bool {
-                                                        return optOutputPixelFormat == optCompatiblePixelFormat;
-                                                    },
-                                                    [](const MediaTypePair &pair) -> const Format::PixelFormat * { return MediaTypeToPixelFormat(&pair.output); });
+                                                    [optInputPixelFormat, optOutputPixelFormat](const MediaTypePair &pair) -> bool {
+                                                        return optInputPixelFormat == pair.inputFormat && optOutputPixelFormat == pair.outputFormat;
+                                                    });
             isOutputTypeOk = iter != _compatibleMediaTypes.cend();
-            g_env.Log(L"CheckTransform() for output type: result: %i output %s offered input: %s compatible input: %s",
-                      isOutputTypeOk, optOutputPixelFormat->name.c_str(), MediaTypeToPixelFormat(mtIn)->name.c_str(), MediaTypeToPixelFormat(&iter->input)->name.c_str());
+            g_env.Log(L"CheckTransform() for %s -> %s, result: %i", optInputPixelFormat->name.c_str(), optOutputPixelFormat->name.c_str(), isOutputTypeOk);
         }
     }
 
@@ -224,16 +222,16 @@ auto CAviSynthFilter::CompleteConnect(PIN_DIRECTION direction, IPin *pReceivePin
         int mediaTypeReconnectionIndex = 0;
         const CMediaType *reconnectInputMediaType = nullptr;
 
-        for (const auto &[compatibleInput, compatibleOutput] : _compatibleMediaTypes) {
-            if (optConnectionOutputPixelFormat == MediaTypeToPixelFormat(&compatibleOutput)) {
-                if (optConnectionInputPixelFormat == MediaTypeToPixelFormat(&compatibleInput)) {
+        for (const auto &[inputType, compatibleInput, outputType, compatibleOutput] : _compatibleMediaTypes) {
+            if (optConnectionOutputPixelFormat == compatibleInput) {
+                if (optConnectionInputPixelFormat == compatibleOutput) {
                     g_env.Log(L"Connected with types: in %s out %s", optConnectionInputPixelFormat->name.c_str(), optConnectionOutputPixelFormat->name.c_str());
                     isMediaTypesCompatible = true;
                     break;
                 }
 
                 if (mediaTypeReconnectionIndex >= _mediaTypeReconnectionWatermark) {
-                    reconnectInputMediaType = &compatibleInput;
+                    reconnectInputMediaType = reinterpret_cast<const CMediaType *>(inputType.get());
                     _mediaTypeReconnectionWatermark += 1;
                     break;
                 }
diff --git a/avisynth_filter/src/filter.h b/avisynth_filter/src/filter.h
index adf3215..25fb53e 100644
--- a/avisynth_filter/src/filter.h
+++ b/avisynth_filter/src/filter.h
@@ -8,6 +8,7 @@
 #include "format.h"
 #include "frame_handler.h"
 #include "remote_control.h"
+#include "util.h"
 
 
 namespace AvsFilter {
@@ -21,7 +22,7 @@ class CAviSynthFilter
 
 public:
     CAviSynthFilter(LPUNKNOWN pUnk, HRESULT *phr);
-    virtual ~CAviSynthFilter();
+    ~CAviSynthFilter() override;
 
     DECLARE_IUNKNOWN
 
@@ -52,11 +53,15 @@ class CAviSynthFilter
 
 private:
     struct MediaTypePair {
-        CMediaType input;
-        CMediaType output;
+        const SharedMediaTypePtr &inputType;
+        const Format::PixelFormat *inputFormat;
+
+        CMediaType outputType;
+        const Format::PixelFormat *outputFormat;
     };
 
-    static constexpr auto InputToOutputMediaType(const AM_MEDIA_TYPE *mtIn) {
+    static auto InputToOutputMediaType(const AM_MEDIA_TYPE *mtIn) {
+        g_avs->GetCheckingScriptInstance().ReloadScript(*mtIn, true);
         return Format::LookupAvsType(g_avs->GetCheckingScriptInstance().GetScriptPixelType()) | std::views::transform([mtIn](const Format::PixelFormat &pixelFormat) -> CMediaType {
             return g_avs->GetCheckingScriptInstance().GenerateMediaType(pixelFormat, mtIn);
         });
diff --git a/avisynth_filter/src/format.cpp b/avisynth_filter/src/format.cpp
index bb916d7..c1d8ceb 100644
--- a/avisynth_filter/src/format.cpp
+++ b/avisynth_filter/src/format.cpp
@@ -159,8 +159,7 @@ auto Format::CopyFromInput(const VideoFormat &videoFormat, const BYTE *srcBuffer
         return;
     }
 
-    const int srcUVHeight = height / videoFormat.pixelFormat->subsampleHeightRatio;
-    if (videoFormat.pixelFormat->areUVPlanesInterleaved) {
+    if (const int srcUVHeight = height / videoFormat.pixelFormat->subsampleHeightRatio; videoFormat.pixelFormat->areUVPlanesInterleaved) {
         const BYTE *srcUVStart = srcBuffer + srcMainPlaneSize;
         const int srcUVStride = srcMainPlaneStride * 2 / videoFormat.pixelFormat->subsampleWidthRatio;
         const int srcUVRowSize = rowSize * 2 / videoFormat.pixelFormat->subsampleWidthRatio;
@@ -226,8 +225,7 @@ auto Format::CopyToOutput(const VideoFormat &videoFormat, const std::array<const
         return;
     }
 
-    const int dstUVHeight = height / videoFormat.pixelFormat->subsampleHeightRatio;
-    if (videoFormat.pixelFormat->areUVPlanesInterleaved) {
+    if (const int dstUVHeight = height / videoFormat.pixelFormat->subsampleHeightRatio; videoFormat.pixelFormat->areUVPlanesInterleaved) {
         BYTE *dstUVStart = dstBuffer + dstMainPlaneSize;
         const int dstUVStride = dstMainPlaneStride * 2 / videoFormat.pixelFormat->subsampleWidthRatio;
         const int dstUVRowSize = rowSize * 2 / videoFormat.pixelFormat->subsampleWidthRatio;
diff --git a/avisynth_filter/src/frame_handler.cpp b/avisynth_filter/src/frame_handler.cpp
index 1e31675..80811dc 100644
--- a/avisynth_filter/src/frame_handler.cpp
+++ b/avisynth_filter/src/frame_handler.cpp
@@ -85,8 +85,7 @@ auto FrameHandler::AddInputSample(IMediaSample *inSample) -> HRESULT {
 
     HDRSideData hdrSideData;
     {
-        const ATL::CComQIPtr<IMediaSideData> inSampleSideData(inSample);
-        if (inSampleSideData != nullptr) {
+        if (const ATL::CComQIPtr<IMediaSideData> inSampleSideData(inSample); inSampleSideData != nullptr) {
             hdrSideData.ReadFrom(inSampleSideData);
 
             if (const std::optional<const BYTE *> optHdr = hdrSideData.GetHDRData()) {
@@ -106,7 +105,7 @@ auto FrameHandler::AddInputSample(IMediaSample *inSample) -> HRESULT {
 
         _sourceFrames.emplace(std::piecewise_construct,
                               std::forward_as_tuple(_nextSourceFrameNb),
-                              std::forward_as_tuple(_nextSourceFrameNb, avsFrame, inSampleStartTime, UniqueMediaTypePtr(pmtIn), hdrSideData));
+                              std::forward_as_tuple(_nextSourceFrameNb, avsFrame, inSampleStartTime, SharedMediaTypePtr(pmtIn, MediaTypeDeleter), hdrSideData));
 
         g_env.Log(L"Stored source frame: %6i at %10lli ~ %10lli duration(literal) %10lli nextSourceFrameNb %6i",
                   _nextSourceFrameNb, inSampleStartTime, inSampleStopTime, inSampleStopTime - inSampleStartTime, _nextSourceFrameNb);
@@ -241,6 +240,7 @@ auto FrameHandler::ResetInputProperties() -> void {
 }
 
 auto FrameHandler::ResetOutputProperties() -> void {
+    // to ensure these non-atomic properties are only modified by their sole consumer the worker thread
     ASSERT(!_outputThread.joinable() || std::this_thread::get_id() == _outputThread.get_id());
 
     _nextProcessSrcFrameNb = 0;
@@ -260,7 +260,7 @@ auto FrameHandler::PrepareForDelivery(PVideoFrame scriptFrame, ATL::CComPtr<IMed
     AM_MEDIA_TYPE *pmtOut;
     outSample->GetMediaType(&pmtOut);
 
-    if (const UniqueMediaTypePtr pmtOutPtr(pmtOut); pmtOut != nullptr && pmtOut->pbFormat != nullptr) {
+    if (const SharedMediaTypePtr pmtOutPtr(pmtOut, MediaTypeDeleter); pmtOut != nullptr && pmtOut->pbFormat != nullptr) {
         _filter.StopStreaming();
         _filter.m_pOutput->SetMediaType(static_cast<CMediaType *>(pmtOut));
 
@@ -366,8 +366,7 @@ auto FrameHandler::ProcessOutputSamples() -> void {
             ResetOutputProperties();
             _filter._reloadAvsSource = false;
 
-            const HRESULT hr = _filter.UpdateOutputFormat(_filter.m_pInput->CurrentMediaType());
-            if (FAILED(hr)) {
+            if (const HRESULT hr = _filter.UpdateOutputFormat(_filter.m_pInput->CurrentMediaType()); FAILED(hr)) {
                 _filter.AbortPlayback(hr);
             }
 
@@ -409,11 +408,8 @@ auto FrameHandler::ProcessOutputSamples() -> void {
                 const PVideoFrame scriptFrame = g_avs->GetMainScriptInstance().GetScriptClip()->GetFrame(_nextOutputFrameNb, g_avs->GetMainScriptInstance().GetEnv());
 
                 if (ATL::CComPtr<IMediaSample> outSample; PrepareForDelivery(scriptFrame, outSample, outputStartTime, outputStopTime)) {
-                    {
-                        const ATL::CComQIPtr<IMediaSideData> outSampleSideData(outSample);
-                        if (outSampleSideData != nullptr) {
-                            processSrcFrames[0]->hdrSideData.WriteTo(outSampleSideData);
-                        }
+                    if (const ATL::CComQIPtr<IMediaSideData> outSampleSideData(outSample); outSampleSideData != nullptr) {
+                        processSrcFrames[0]->hdrSideData.WriteTo(outSampleSideData);
                     }
 
                     const std::unique_lock filterLock(_filter.m_csFilter);
diff --git a/avisynth_filter/src/frame_handler.h b/avisynth_filter/src/frame_handler.h
index 1ab156d..1863ada 100644
--- a/avisynth_filter/src/frame_handler.h
+++ b/avisynth_filter/src/frame_handler.h
@@ -57,7 +57,7 @@ class FrameHandler {
         int frameNb;
         PVideoFrame avsFrame;
         REFERENCE_TIME startTime;
-        UniqueMediaTypePtr mediaTypePtr;
+        SharedMediaTypePtr mediaTypePtr;
         HDRSideData hdrSideData;
     };
 
diff --git a/avisynth_filter/src/input_pin.cpp b/avisynth_filter/src/input_pin.cpp
index 5d989da..ffa9ebc 100644
--- a/avisynth_filter/src/input_pin.cpp
+++ b/avisynth_filter/src/input_pin.cpp
@@ -24,12 +24,12 @@ auto STDMETHODCALLTYPE CAviSynthFilterInputPin::ReceiveConnection(IPin *pConnect
 
     const HRESULT receiveConnectionHr = __super::ReceiveConnection(pConnector, pmt);
 
-    const std::unique_lock lock(*m_pLock);
-
     if (receiveConnectionHr == VFW_E_ALREADY_CONNECTED) {
         ASSERT(m_pAllocator != nullptr);
 
         if (CheckMediaType(static_cast<const CMediaType *>(pmt)) == S_OK) {
+            const std::unique_lock lock(*m_pLock);
+
             ALLOCATOR_PROPERTIES props, actual;
 
             CheckHr(m_pAllocator->Decommit());
diff --git a/avisynth_filter/src/prop_settings.cpp b/avisynth_filter/src/prop_settings.cpp
index 1e6f463..23013a0 100644
--- a/avisynth_filter/src/prop_settings.cpp
+++ b/avisynth_filter/src/prop_settings.cpp
@@ -83,9 +83,8 @@ auto CAvsFilterPropSettings::OnReceiveMessage(HWND hwnd, UINT uMsg, WPARAM wPara
             if (const WORD eventTarget = LOWORD(wParam); eventTarget == IDC_EDIT_AVS_FILE) {
                 std::array<WCHAR, STR_MAX_LENGTH> buffer;
                 GetDlgItemTextW(hwnd, IDC_EDIT_AVS_FILE, buffer.data(), static_cast<int>(buffer.size()));
-                const std::wstring newValue = std::wstring(buffer.data(), buffer.size()).c_str();
 
-                if (newValue != _configAvsPath) {
+                if (const std::wstring newValue = std::wstring(buffer.data(), buffer.size()).c_str(); newValue != _configAvsPath) {
                     _configAvsPath = newValue;
                     SetDirty();
                 }
diff --git a/avisynth_filter/src/registry.cpp b/avisynth_filter/src/registry.cpp
index 72cdc91..17d95da 100644
--- a/avisynth_filter/src/registry.cpp
+++ b/avisynth_filter/src/registry.cpp
@@ -24,8 +24,8 @@ auto Registry::ReadString(const WCHAR *valueName) const -> std::wstring {
         std::array<WCHAR, MAX_PATH> buffer;
         DWORD bufferSize = static_cast<DWORD>(buffer.size());
 
-        const LSTATUS registryStatus = RegGetValueW(_registryKey, nullptr, valueName, RRF_RT_REG_SZ, nullptr, buffer.data(), &bufferSize);
-        if (registryStatus == ERROR_SUCCESS) {
+        if (const LSTATUS registryStatus = RegGetValueW(_registryKey, nullptr, valueName, RRF_RT_REG_SZ, nullptr, buffer.data(), &bufferSize);
+            registryStatus == ERROR_SUCCESS) {
             ret.assign(buffer.data(), bufferSize / sizeof(WCHAR) - 1);
         }
     }
diff --git a/avisynth_filter/src/util.h b/avisynth_filter/src/util.h
index 145d4be..2a7a810 100644
--- a/avisynth_filter/src/util.h
+++ b/avisynth_filter/src/util.h
@@ -7,12 +7,10 @@
 
 namespace AvsFilter {
 
-struct MediaTypeDeleter {
-    auto operator()(AM_MEDIA_TYPE *mediaType) const -> void {
-        DeleteMediaType(mediaType);
-    }
-};
-using UniqueMediaTypePtr = std::unique_ptr<AM_MEDIA_TYPE, MediaTypeDeleter>;
+inline auto MediaTypeDeleter(AM_MEDIA_TYPE *mediaType) -> void {
+    DeleteMediaType(mediaType);
+}
+using SharedMediaTypePtr = std::shared_ptr<AM_MEDIA_TYPE>;
 
 auto ConvertWideToUtf8(const std::wstring &wideString) -> std::string;
 auto ConvertUtf8ToWide(const std::string &utf8String) -> std::wstring;