チュートリアル: WRL および Media Foundation を使用した UWP アプリの作成
Note
新しい UWP アプリとコンポーネントでは、Windows ランタイム API の新しい標準 C++17 言語投影である C++/WinRT を使用することをお勧めします。 C++/WinRT は、Windows SDK バージョン 1803 (10.0.17134.0) 以降で使用できます。 C++/WinRT は、全体がヘッダー ファイル内に実装され、最新の Windows API に対する最高級のアクセスを提供するように設計されています。
このチュートリアルでは、Windows ランタイム C++ テンプレート ライブラリ (WRL) を使用して、Microsoft メディア ファンデーションを使用するユニバーサル Windows Platform (UWP) アプリを作成する方法について説明します。
この例では、メディア ファンデーションのカスタム変換を作成します。 これにより、Web カメラからキャプチャされた画像にグレースケール効果が適用されます。 アプリでは、カスタム変換の定義のために C++ を使用し、キャプチャしたイメージを変換するコンポーネントを使用するために C# を使用しています。
Note
C# の代わりに、JavaScript、Visual Basic、または C++ でカスタム変換コンポーネントを使用することもできます。
通常は、C++/CX を使用して Windows ランタイム コンポーネントを作成できます。 ただし、場合によっては WRL を使用する必要があります。 たとえば、Microsoft メディア ファンデーションのメディア拡張機能を作成する場合、COM および Windows ランタイム インターフェイスの両方を実装するコンポーネントを作成する必要があります。 C++/CX で作成できるのは Windows ランタイム オブジェクトのみであるため、メディア拡張機能を作成するには WRL を使用する必要があります。 これにより、COM インターフェイスと Windows ランタイム インターフェイスの両方の実装が有効になるためです。
Note
このコード例は長いですが、役に立つメディア ファンデーション変換を作成するために必要な最低限のコードを示しています。 独自のカスタム変換を作成するための出発点として、このコード例を使用することができます。 この例は、メディア拡張機能サンプル (メディア拡張機能を使用して、ビデオへの効果の適用、ビデオのデコード、メディア ストリームを生成するスキーム ハンドラーの作成などを行うサンプル) を修正したものです。
前提条件
Visual Studio 2017 以降では、UWP のサポートはオプション コンポーネントです。 インストールするには、Windows の [スタート] メニューから Visual Studio インストーラーを開き、お使いの Visual Studio のバージョンを探します。 [変更] を選択してから、[ユニバーサル Windows プラットフォーム開発] タイルがオンになっていることを確認します。 [オプション コンポーネント] で、Visual Studio 2017 の場合は [C++ Tools for UWP (v141)]、Visual Studio 2019 の場合は [C++ Tools for UWP (v142)] をオンにします。 その後、使用する Windows SDK のバージョンをオンにします。
Windows ランタイムの使用経験。
COM の使用経験。
Web カメラ。
重要なポイント
カスタム メディア ファンデーション コンポーネントを作成するには、Microsoft インターフェイス定義言語 (MIDL) の定義ファイルを使用してインターフェイスを定義し、そのインターフェイスを実装して、他のコンポーネントからアクティブ化できるようにします。
namespace属性とruntimeclass属性、およびNTDDI_WIN8version 属性値は、WRL を使用する Media Foundation コンポーネントの MIDL 定義の重要な部分です。Microsoft::WRL::RuntimeClassは、カスタム メディア ファンデーション コンポーネントの基底クラスです。 [Microsoft::WRL::RuntimeClassType::WinRtClassicComMix](runtimeclasstype-enumeration.md) 列挙値をテンプレート引数として指定すると、クラスが Windows ランタイム クラスとクラシック COM ランタイム クラスの両方のクラスとして使用するためにマークされます。InspectableClassマクロによって、参照カウントやQueryInterfaceメソッドなどの COM 基本機能が実装され、ランタイム クラス名と信頼レベルが設定されます。Microsoft::WRL::Moduleクラスを使用して、DllGetActivationFactory、DllCanUnloadNow、DllGetClassObjectなどの DLL エントリポイント関数を実装します。コンポーネント DLL を
runtimeobject.libにリンクします。 また、Windows メタデータを生成するために、リンカー行で/WINMDを指定します。プロジェクト参照を使用して、WRL コンポーネントを UWP アプリからアクセスできるようにします。
WRL を使用してメディア ファンデーションのグレースケール変換コンポーネントを作成するには
Visual Studio で、空のソリューション プロジェクトを作成します。 プロジェクトに MediaCapture などの名前を付けます。
ソリューションに DLL (ユニバーサル Windows) プロジェクトを追加します。 プロジェクトに GrayscaleTransform などの名前を付けます。
プロジェクトに MIDL ファイル (.idl) ファイルを追加します。 ファイルに名前を付けます (例:
GrayscaleTransform.idl)。次のコードを GrayscaleTransform.idl に追加します。
import "Windows.Media.idl"; #include <sdkddkver.h> namespace GrayscaleTransform { [version(NTDDI_WIN8), activatable(NTDDI_WIN8)] runtimeclass GrayscaleEffect { [default] interface Windows.Media.IMediaExtension; } }次のコードを使用して
pch.hの内容を置き換えます。#pragma once #include "targetver.h" #include <new> #include <mfapi.h> #include <mftransform.h> #include <mfidl.h> #include <mferror.h> #include <strsafe.h> #include <assert.h> // Note: The Direct2D helper library is included for its 2D matrix operations. #include <D2d1helper.h> #include <wrl\implements.h> #include <wrl\module.h> #include <windows.media.h>新しいヘッダー ファイルをプロジェクトに追加し、
BufferLock.hという名前を付けてから、内容を次のコードに置き換えます。#pragma once // Locks a video buffer that might or might not support IMF2DBuffer. class VideoBufferLock { public: VideoBufferLock(IMFMediaBuffer *pBuffer) : m_p2DBuffer(nullptr) { m_pBuffer = pBuffer; m_pBuffer->AddRef(); // Query for the 2-D buffer interface. OK if this fails. m_pBuffer->QueryInterface(IID_PPV_ARGS(&m_p2DBuffer)); } ~VideoBufferLock() { UnlockBuffer(); m_pBuffer->Release(); if (m_p2DBuffer) { m_p2DBuffer->Release(); } } // LockBuffer: // Locks the buffer. Returns a pointer to scan line 0 and returns the stride. // The caller must provide the default stride as an input parameter, in case // the buffer does not expose IMF2DBuffer. You can calculate the default stride // from the media type. HRESULT LockBuffer( LONG lDefaultStride, // Minimum stride (with no padding). DWORD dwHeightInPixels, // Height of the image, in pixels. BYTE **ppbScanLine0, // Receives a pointer to the start of scan line 0. LONG *plStride // Receives the actual stride. ) { HRESULT hr = S_OK; // Use the 2-D version if available. if (m_p2DBuffer) { hr = m_p2DBuffer->Lock2D(ppbScanLine0, plStride); } else { // Use non-2D version. BYTE *pData = nullptr; hr = m_pBuffer->Lock(&pData, nullptr, nullptr); if (SUCCEEDED(hr)) { *plStride = lDefaultStride; if (lDefaultStride < 0) { // Bottom-up orientation. Return a pointer to the start of the // last row *in memory* which is the top row of the image. *ppbScanLine0 = pData + abs(lDefaultStride) * (dwHeightInPixels - 1); } else { // Top-down orientation. Return a pointer to the start of the // buffer. *ppbScanLine0 = pData; } } } return hr; } HRESULT UnlockBuffer() { if (m_p2DBuffer) { return m_p2DBuffer->Unlock2D(); } else { return m_pBuffer->Unlock(); } } private: IMFMediaBuffer *m_pBuffer; IMF2DBuffer *m_p2DBuffer; };GrayscaleTransform.hは、この例では使用されていません。 このファイルは必要に応じてプロジェクトから削除できます。次のコードを使用して
GrayscaleTransform.cppの内容を置き換えます。#include "pch.h" #include "GrayscaleTransform_h.h" #include "BufferLock.h" using namespace Microsoft::WRL; // // * IMPORTANT: If you implement your own MFT, create a new GUID for the CLSID. * // // Configuration attributes // {7BBBB051-133B-41F5-B6AA-5AFF9B33A2CB} GUID const MFT_GRAYSCALE_DESTINATION_RECT = {0x7bbbb051, 0x133b, 0x41f5, 0xb6, 0xaa, 0x5a, 0xff, 0x9b, 0x33, 0xa2, 0xcb}; // {14782342-93E8-4565-872C-D9A2973D5CBF} GUID const MFT_GRAYSCALE_SATURATION = {0x14782342, 0x93e8, 0x4565, 0x87, 0x2c, 0xd9, 0xa2, 0x97, 0x3d, 0x5c, 0xbf}; // {E0BADE5D-E4B9-4689-9DBA-E2F00D9CED0E} GUID const MFT_GRAYSCALE_CHROMA_ROTATION = {0xe0bade5d, 0xe4b9, 0x4689, 0x9d, 0xba, 0xe2, 0xf0, 0xd, 0x9c, 0xed, 0xe}; template <class T> void SafeRelease(T **ppT) { if (*ppT) { (*ppT)->Release(); *ppT = nullptr; } } // Function pointer for the function that transforms the image. typedef void (*IMAGE_TRANSFORM_FN)( const D2D1::Matrix3x2F& mat, // Chroma transform matrix. const D2D_RECT_U& rcDest, // Destination rectangle for the transformation. BYTE* pDest, // Destination buffer. LONG lDestStride, // Destination stride. const BYTE* pSrc, // Source buffer. LONG lSrcStride, // Source stride. DWORD dwWidthInPixels, // Image width in pixels. DWORD dwHeightInPixels // Image height in pixels. ); // Implements a grayscale video effect. class CGrayscale : public RuntimeClass< RuntimeClassFlags<RuntimeClassType::WinRtClassicComMix>, ABI::Windows::Media::IMediaExtension, IMFTransform> { InspectableClass(RuntimeClass_GrayscaleTransform_GrayscaleEffect, BaseTrust) public: CGrayscale(); STDMETHOD(RuntimeClassInitialize)(); // IMediaExtension STDMETHODIMP SetProperties(ABI::Windows::Foundation::Collections::IPropertySet *pConfiguration); // IMFTransform STDMETHODIMP GetStreamLimits( DWORD *pdwInputMinimum, DWORD *pdwInputMaximum, DWORD *pdwOutputMinimum, DWORD *pdwOutputMaximum ); STDMETHODIMP GetStreamCount( DWORD *pcInputStreams, DWORD *pcOutputStreams ); STDMETHODIMP GetStreamIDs( DWORD dwInputIDArraySize, DWORD *pdwInputIDs, DWORD dwOutputIDArraySize, DWORD *pdwOutputIDs ); STDMETHODIMP GetInputStreamInfo( DWORD dwInputStreamID, MFT_INPUT_STREAM_INFO * pStreamInfo ); STDMETHODIMP GetOutputStreamInfo( DWORD dwOutputStreamID, MFT_OUTPUT_STREAM_INFO * pStreamInfo ); STDMETHODIMP GetAttributes(IMFAttributes** pAttributes); STDMETHODIMP GetInputStreamAttributes( DWORD dwInputStreamID, IMFAttributes **ppAttributes ); STDMETHODIMP GetOutputStreamAttributes( DWORD dwOutputStreamID, IMFAttributes **ppAttributes ); STDMETHODIMP DeleteInputStream(DWORD dwStreamID); STDMETHODIMP AddInputStreams( DWORD cStreams, DWORD *adwStreamIDs ); STDMETHODIMP GetInputAvailableType( DWORD dwInputStreamID, DWORD dwTypeIndex, // 0-based IMFMediaType **ppType ); STDMETHODIMP GetOutputAvailableType( DWORD dwOutputStreamID, DWORD dwTypeIndex, // 0-based IMFMediaType **ppType ); STDMETHODIMP SetInputType( DWORD dwInputStreamID, IMFMediaType *pType, DWORD dwFlags ); STDMETHODIMP SetOutputType( DWORD dwOutputStreamID, IMFMediaType *pType, DWORD dwFlags ); STDMETHODIMP GetInputCurrentType( DWORD dwInputStreamID, IMFMediaType **ppType ); STDMETHODIMP GetOutputCurrentType( DWORD dwOutputStreamID, IMFMediaType **ppType ); STDMETHODIMP GetInputStatus( DWORD dwInputStreamID, DWORD *pdwFlags ); STDMETHODIMP GetOutputStatus(DWORD *pdwFlags); STDMETHODIMP SetOutputBounds( LONGLONG hnsLowerBound, LONGLONG hnsUpperBound ); STDMETHODIMP ProcessEvent( DWORD dwInputStreamID, IMFMediaEvent *pEvent ); STDMETHODIMP ProcessMessage( MFT_MESSAGE_TYPE eMessage, ULONG_PTR ulParam ); STDMETHODIMP ProcessInput( DWORD dwInputStreamID, IMFSample *pSample, DWORD dwFlags ); STDMETHODIMP ProcessOutput( DWORD dwFlags, DWORD cOutputBufferCount, MFT_OUTPUT_DATA_BUFFER *pOutputSamples, // one per stream DWORD *pdwStatus ); private: ~CGrayscale(); // HasPendingOutput: Returns TRUE if the MFT is holding an input sample. BOOL HasPendingOutput() const { return m_pSample != nullptr; } // IsValidInputStream: Returns TRUE if dwInputStreamID is a valid input stream identifier. BOOL IsValidInputStream(DWORD dwInputStreamID) const { return dwInputStreamID == 0; } // IsValidOutputStream: Returns TRUE if dwOutputStreamID is a valid output stream identifier. BOOL IsValidOutputStream(DWORD dwOutputStreamID) const { return dwOutputStreamID == 0; } HRESULT OnGetPartialType(DWORD dwTypeIndex, IMFMediaType **ppmt); HRESULT OnCheckInputType(IMFMediaType *pmt); HRESULT OnCheckOutputType(IMFMediaType *pmt); HRESULT OnCheckMediaType(IMFMediaType *pmt); void OnSetInputType(IMFMediaType *pmt); void OnSetOutputType(IMFMediaType *pmt); HRESULT BeginStreaming(); HRESULT EndStreaming(); HRESULT OnProcessOutput(IMFMediaBuffer *pIn, IMFMediaBuffer *pOut); HRESULT OnFlush(); HRESULT UpdateFormatInfo(); CRITICAL_SECTION m_critSec; // Transformation parameters D2D1::Matrix3x2F m_transform; // Chroma transform matrix. D2D_RECT_U m_rcDest; // Destination rectangle for the effect. // Streaming bool m_bStreamingInitialized; IMFSample *m_pSample; // Input sample. IMFMediaType *m_pInputType; // Input media type. IMFMediaType *m_pOutputType; // Output media type. // Fomat information UINT32 m_imageWidthInPixels; UINT32 m_imageHeightInPixels; DWORD m_cbImageSize; // Image size, in bytes. IMFAttributes *m_pAttributes; // Image transform function. (Changes based on the media type.) IMAGE_TRANSFORM_FN m_pTransformFn; }; ActivatableClass(CGrayscale); #pragma comment(lib, "d2d1") /* This sample implements a video effect as a Media Foundation transform (MFT). The video effect manipulates chroma values in a YUV image. In the default setting, the entire image is converted to grayscale. Optionally, the application may set any of the following attributes: MFT_GRAYSCALE_DESTINATION_RECT (type = blob, UINT32[4] array) Sets the destination rectangle for the effect. Pixels outside the destination rectangle are not altered. MFT_GRAYSCALE_SATURATION (type = double) Sets the saturation level. The nominal range is [0...1]. Values beyond 1.0f result in supersaturated colors. Values below 0.0f create inverted colors. MFT_GRAYSCALE_CHROMA_ROTATION (type = double) Rotates the chroma values of each pixel. The attribue value is the angle of rotation in degrees. The result is a shift in hue. The effect is implemented by treating the chroma value of each pixel as a vector [u,v], and applying a transformation matrix to the vector. The saturation parameter is applied as a scaling transform. NOTES ON THE MFT IMPLEMENTATION 1. The MFT has fixed streams: One input stream and one output stream. 2. The MFT supports the following formats: UYVY, YUY2, NV12. 3. If the MFT is holding an input sample, SetInputType and SetOutputType both fail. 4. The input and output types must be identical. 5. If both types are set, no type can be set until the current type is cleared. 6. Preferred input types: (a) If the output type is set, that's the preferred type. (b) Otherwise, the preferred types are partial types, constructed from the list of supported subtypes. 7. Preferred output types: As above. 8. Streaming: The private BeingStreaming() method is called in response to the MFT_MESSAGE_NOTIFY_BEGIN_STREAMING message. If the client does not send MFT_MESSAGE_NOTIFY_BEGIN_STREAMING, the MFT calls BeginStreaming inside the first call to ProcessInput or ProcessOutput. This is a good approach for allocating resources that your MFT requires for streaming. 9. The configuration attributes are applied in the BeginStreaming method. If the client changes the attributes during streaming, the change is ignored until streaming is stopped (either by changing the media types or by sending the MFT_MESSAGE_NOTIFY_END_STREAMING message) and then restarted. */ // Video FOURCC codes. const DWORD FOURCC_YUY2 = '2YUY'; const DWORD FOURCC_UYVY = 'YVYU'; const DWORD FOURCC_NV12 = '21VN'; // Static array of media types (preferred and accepted). const GUID g_MediaSubtypes[] = { MFVideoFormat_NV12, MFVideoFormat_YUY2, MFVideoFormat_UYVY }; HRESULT GetImageSize(DWORD fcc, UINT32 width, UINT32 height, DWORD* pcbImage); HRESULT GetDefaultStride(IMFMediaType *pType, LONG *plStride); bool ValidateRect(const RECT& rc); template <typename T> inline T clamp(const T& val, const T& minVal, const T& maxVal) { return (val < minVal ? minVal : (val > maxVal ? maxVal : val)); } // TransformChroma: // Apply the transforms to calculate the output chroma values. void TransformChroma(const D2D1::Matrix3x2F& mat, BYTE *pu, BYTE *pv) { // Normalize the chroma values to [-112, 112] range D2D1_POINT_2F pt = { static_cast<float>(*pu) - 128, static_cast<float>(*pv) - 128 }; pt = mat.TransformPoint(pt); // Clamp to valid range. clamp(pt.x, -112.0f, 112.0f); clamp(pt.y, -112.0f, 112.0f); // Map back to [16...240] range. *pu = static_cast<BYTE>(pt.x + 128.0f); *pv = static_cast<BYTE>(pt.y + 128.0f); } //------------------------------------------------------------------- // Functions to convert a YUV images to grayscale. // // In all cases, the same transformation is applied to the 8-bit // chroma values, but the pixel layout in memory differs. // // The image conversion functions take the following parameters: // // mat Transfomation matrix for chroma values. // rcDest Destination rectangle. // pDest Pointer to the destination buffer. // lDestStride Stride of the destination buffer, in bytes. // pSrc Pointer to the source buffer. // lSrcStride Stride of the source buffer, in bytes. // dwWidthInPixels Frame width in pixels. // dwHeightInPixels Frame height, in pixels. //------------------------------------------------------------------- // Convert UYVY image. void TransformImage_UYVY( const D2D1::Matrix3x2F& mat, const D2D_RECT_U& rcDest, _Inout_updates_(_Inexpressible_(lDestStride * dwHeightInPixels)) BYTE *pDest, _In_ LONG lDestStride, _In_reads_(_Inexpressible_(lSrcStride * dwHeightInPixels)) const BYTE* pSrc, _In_ LONG lSrcStride, _In_ DWORD dwWidthInPixels, _In_ DWORD dwHeightInPixels) { DWORD y = 0; const DWORD y0 = min(rcDest.bottom, dwHeightInPixels); // Lines above the destination rectangle. for ( ; y < rcDest.top; y++) { memcpy(pDest, pSrc, dwWidthInPixels * 2); pSrc += lSrcStride; pDest += lDestStride; } // Lines within the destination rectangle. for ( ; y < y0; y++) { WORD *pSrc_Pixel = (WORD*)pSrc; WORD *pDest_Pixel = (WORD*)pDest; for (DWORD x = 0; (x + 1) < dwWidthInPixels; x += 2) { // Byte order is U0 Y0 V0 Y1 // Each WORD is a byte pair (U/V, Y) // Windows is little-endian so the order appears reversed. if (x >= rcDest.left && x < rcDest.right) { BYTE u = pSrc_Pixel[x] & 0x00FF; BYTE v = pSrc_Pixel[x+1] & 0x00FF; TransformChroma(mat, &u, &v); pDest_Pixel[x] = (pSrc_Pixel[x] & 0xFF00) | u; pDest_Pixel[x+1] = (pSrc_Pixel[x+1] & 0xFF00) | v; } else { #pragma warning(push) #pragma warning(disable: 6385) #pragma warning(disable: 6386) pDest_Pixel[x] = pSrc_Pixel[x]; pDest_Pixel[x+1] = pSrc_Pixel[x+1]; #pragma warning(pop) } } pDest += lDestStride; pSrc += lSrcStride; } // Lines below the destination rectangle. for ( ; y < dwHeightInPixels; y++) { memcpy(pDest, pSrc, dwWidthInPixels * 2); pSrc += lSrcStride; pDest += lDestStride; } } // Convert YUY2 image. void TransformImage_YUY2( const D2D1::Matrix3x2F& mat, const D2D_RECT_U& rcDest, _Inout_updates_(_Inexpressible_(lDestStride * dwHeightInPixels)) BYTE *pDest, _In_ LONG lDestStride, _In_reads_(_Inexpressible_(lSrcStride * dwHeightInPixels)) const BYTE* pSrc, _In_ LONG lSrcStride, _In_ DWORD dwWidthInPixels, _In_ DWORD dwHeightInPixels) { DWORD y = 0; const DWORD y0 = min(rcDest.bottom, dwHeightInPixels); // Lines above the destination rectangle. for ( ; y < rcDest.top; y++) { memcpy(pDest, pSrc, dwWidthInPixels * 2); pSrc += lSrcStride; pDest += lDestStride; } // Lines within the destination rectangle. for ( ; y < y0; y++) { WORD *pSrc_Pixel = (WORD*)pSrc; WORD *pDest_Pixel = (WORD*)pDest; for (DWORD x = 0; (x + 1) < dwWidthInPixels; x += 2) { // Byte order is Y0 U0 Y1 V0 // Each WORD is a byte pair (Y, U/V) // Windows is little-endian so the order appears reversed. if (x >= rcDest.left && x < rcDest.right) { BYTE u = pSrc_Pixel[x] >> 8; BYTE v = pSrc_Pixel[x+1] >> 8; TransformChroma(mat, &u, &v); pDest_Pixel[x] = (pSrc_Pixel[x] & 0x00FF) | (u<<8); pDest_Pixel[x+1] = (pSrc_Pixel[x+1] & 0x00FF) | (v<<8); } else { #pragma warning(push) #pragma warning(disable: 6385) #pragma warning(disable: 6386) pDest_Pixel[x] = pSrc_Pixel[x]; pDest_Pixel[x+1] = pSrc_Pixel[x+1]; #pragma warning(pop) } } pDest += lDestStride; pSrc += lSrcStride; } // Lines below the destination rectangle. for ( ; y < dwHeightInPixels; y++) { memcpy(pDest, pSrc, dwWidthInPixels * 2); pSrc += lSrcStride; pDest += lDestStride; } } // Convert NV12 image void TransformImage_NV12( const D2D1::Matrix3x2F& mat, const D2D_RECT_U& rcDest, _Inout_updates_(_Inexpressible_(2 * lDestStride * dwHeightInPixels)) BYTE *pDest, _In_ LONG lDestStride, _In_reads_(_Inexpressible_(2 * lSrcStride * dwHeightInPixels)) const BYTE* pSrc, _In_ LONG lSrcStride, _In_ DWORD dwWidthInPixels, _In_ DWORD dwHeightInPixels) { // NV12 is planar: Y plane, followed by packed U-V plane. // Y plane for (DWORD y = 0; y < dwHeightInPixels; y++) { CopyMemory(pDest, pSrc, dwWidthInPixels); pDest += lDestStride; pSrc += lSrcStride; } // U-V plane // NOTE: The U-V plane has 1/2 the number of lines as the Y plane. // Lines above the destination rectangle. DWORD y = 0; const DWORD y0 = min(rcDest.bottom, dwHeightInPixels); for ( ; y < rcDest.top/2; y++) { memcpy(pDest, pSrc, dwWidthInPixels); pSrc += lSrcStride; pDest += lDestStride; } // Lines within the destination rectangle. for ( ; y < y0/2; y++) { for (DWORD x = 0; (x + 1) < dwWidthInPixels; x += 2) { if (x >= rcDest.left && x < rcDest.right) { BYTE u = pSrc[x]; BYTE v = pSrc[x+1]; TransformChroma(mat, &u, &v); pDest[x] = u; pDest[x+1] = v; } else { pDest[x] = pSrc[x]; pDest[x+1] = pSrc[x+1]; } } pDest += lDestStride; pSrc += lSrcStride; } // Lines below the destination rectangle. for ( ; y < dwHeightInPixels/2; y++) { memcpy(pDest, pSrc, dwWidthInPixels); pSrc += lSrcStride; pDest += lDestStride; } } CGrayscale::CGrayscale() : m_pSample(nullptr), m_pInputType(nullptr), m_pOutputType(nullptr), m_pTransformFn(nullptr), m_imageWidthInPixels(0), m_imageHeightInPixels(0), m_cbImageSize(0), m_transform(D2D1::Matrix3x2F::Identity()), m_rcDest(D2D1::RectU()), m_bStreamingInitialized(false), m_pAttributes(nullptr) { InitializeCriticalSectionEx(&m_critSec, 3000, 0); } CGrayscale::~CGrayscale() { SafeRelease(&m_pInputType); SafeRelease(&m_pOutputType); SafeRelease(&m_pSample); SafeRelease(&m_pAttributes); DeleteCriticalSection(&m_critSec); } // Initialize the instance. STDMETHODIMP CGrayscale::RuntimeClassInitialize() { // Create the attribute store. return MFCreateAttributes(&m_pAttributes, 3); } // IMediaExtension methods //------------------------------------------------------------------- // SetProperties // Sets the configuration of the effect //------------------------------------------------------------------- HRESULT CGrayscale::SetProperties(ABI::Windows::Foundation::Collections::IPropertySet *pConfiguration) { return S_OK; } // IMFTransform methods. Refer to the Media Foundation SDK documentation for details. //------------------------------------------------------------------- // GetStreamLimits // Returns the minimum and maximum number of streams. //------------------------------------------------------------------- HRESULT CGrayscale::GetStreamLimits( DWORD *pdwInputMinimum, DWORD *pdwInputMaximum, DWORD *pdwOutputMinimum, DWORD *pdwOutputMaximum ) { // This MFT has a fixed number of streams. *pdwInputMinimum = 1; *pdwInputMaximum = 1; *pdwOutputMinimum = 1; *pdwOutputMaximum = 1; return S_OK; } // Returns the actual number of streams. HRESULT CGrayscale::GetStreamCount( DWORD *pcInputStreams, DWORD *pcOutputStreams ) { // This MFT has a fixed number of streams. *pcInputStreams = 1; *pcOutputStreams = 1; return S_OK; } //------------------------------------------------------------------- // GetStreamIDs // Returns stream IDs for the input and output streams. //------------------------------------------------------------------- HRESULT CGrayscale::GetStreamIDs( DWORD dwInputIDArraySize, DWORD *pdwInputIDs, DWORD dwOutputIDArraySize, DWORD *pdwOutputIDs ) { // It is not required to implement this method if the MFT has a fixed number of // streams AND the stream IDs are numbered sequentially from zero (that is, the // stream IDs match the stream indexes). // In that case, it is OK to return E_NOTIMPL. return E_NOTIMPL; } //------------------------------------------------------------------- // GetInputStreamInfo // Returns information about an input stream. //------------------------------------------------------------------- HRESULT CGrayscale::GetInputStreamInfo( DWORD dwInputStreamID, MFT_INPUT_STREAM_INFO * pStreamInfo ) { EnterCriticalSection(&m_critSec); if (!IsValidInputStream(dwInputStreamID)) { LeaveCriticalSection(&m_critSec); return MF_E_INVALIDSTREAMNUMBER; } // NOTE: This method should succeed even when there is no media type on the // stream. If there is no media type, we only need to fill in the dwFlags // member of MFT_INPUT_STREAM_INFO. The other members depend on having a // a valid media type. pStreamInfo->hnsMaxLatency = 0; pStreamInfo->dwFlags = MFT_INPUT_STREAM_WHOLE_SAMPLES | MFT_INPUT_STREAM_SINGLE_SAMPLE_PER_BUFFER; if (m_pInputType == nullptr) { pStreamInfo->cbSize = 0; } else { pStreamInfo->cbSize = m_cbImageSize; } pStreamInfo->cbMaxLookahead = 0; pStreamInfo->cbAlignment = 0; LeaveCriticalSection(&m_critSec); return S_OK; } //------------------------------------------------------------------- // GetOutputStreamInfo // Returns information about an output stream. //------------------------------------------------------------------- HRESULT CGrayscale::GetOutputStreamInfo( DWORD dwOutputStreamID, MFT_OUTPUT_STREAM_INFO * pStreamInfo ) { EnterCriticalSection(&m_critSec); if (!IsValidOutputStream(dwOutputStreamID)) { LeaveCriticalSection(&m_critSec); return MF_E_INVALIDSTREAMNUMBER; } // NOTE: This method should succeed even when there is no media type on the // stream. If there is no media type, we only need to fill in the dwFlags // member of MFT_OUTPUT_STREAM_INFO. The other members depend on having a // a valid media type. pStreamInfo->dwFlags = MFT_OUTPUT_STREAM_WHOLE_SAMPLES | MFT_OUTPUT_STREAM_SINGLE_SAMPLE_PER_BUFFER | MFT_OUTPUT_STREAM_FIXED_SAMPLE_SIZE ; if (m_pOutputType == nullptr) { pStreamInfo->cbSize = 0; } else { pStreamInfo->cbSize = m_cbImageSize; } pStreamInfo->cbAlignment = 0; LeaveCriticalSection(&m_critSec); return S_OK; } // Returns the attributes for the MFT. HRESULT CGrayscale::GetAttributes(IMFAttributes** ppAttributes) { EnterCriticalSection(&m_critSec); *ppAttributes = m_pAttributes; (*ppAttributes)->AddRef(); LeaveCriticalSection(&m_critSec); return S_OK; } // Returns stream-level attributes for an input stream. HRESULT CGrayscale::GetInputStreamAttributes( DWORD dwInputStreamID, IMFAttributes **ppAttributes ) { // This MFT does not support any stream-level attributes, so the method is not implemented. return E_NOTIMPL; } //------------------------------------------------------------------- // GetOutputStreamAttributes // Returns stream-level attributes for an output stream. //------------------------------------------------------------------- HRESULT CGrayscale::GetOutputStreamAttributes( DWORD dwOutputStreamID, IMFAttributes **ppAttributes ) { // This MFT does not support any stream-level attributes, so the method is not implemented. return E_NOTIMPL; } //------------------------------------------------------------------- // DeleteInputStream //------------------------------------------------------------------- HRESULT CGrayscale::DeleteInputStream(DWORD dwStreamID) { // This MFT has a fixed number of input streams, so the method is not supported. return E_NOTIMPL; } //------------------------------------------------------------------- // AddInputStreams //------------------------------------------------------------------- HRESULT CGrayscale::AddInputStreams( DWORD cStreams, DWORD *adwStreamIDs ) { // This MFT has a fixed number of output streams, so the method is not supported. return E_NOTIMPL; } //------------------------------------------------------------------- // GetInputAvailableType // Returns a preferred input type. //------------------------------------------------------------------- HRESULT CGrayscale::GetInputAvailableType( DWORD dwInputStreamID, DWORD dwTypeIndex, // 0-based IMFMediaType **ppType ) { EnterCriticalSection(&m_critSec); if (!IsValidInputStream(dwInputStreamID)) { LeaveCriticalSection(&m_critSec); return MF_E_INVALIDSTREAMNUMBER; } HRESULT hr = S_OK; // If the output type is set, return that type as our preferred input type. if (m_pOutputType == nullptr) { // The output type is not set. Create a partial media type. hr = OnGetPartialType(dwTypeIndex, ppType); } else if (dwTypeIndex > 0) { hr = MF_E_NO_MORE_TYPES; } else { *ppType = m_pOutputType; (*ppType)->AddRef(); } LeaveCriticalSection(&m_critSec); return hr; } // Returns a preferred output type. HRESULT CGrayscale::GetOutputAvailableType( DWORD dwOutputStreamID, DWORD dwTypeIndex, // 0-based IMFMediaType **ppType ) { EnterCriticalSection(&m_critSec); if (!IsValidOutputStream(dwOutputStreamID)) { LeaveCriticalSection(&m_critSec); return MF_E_INVALIDSTREAMNUMBER; } HRESULT hr = S_OK; if (m_pInputType == nullptr) { // The input type is not set. Create a partial media type. hr = OnGetPartialType(dwTypeIndex, ppType); } else if (dwTypeIndex > 0) { hr = MF_E_NO_MORE_TYPES; } else { *ppType = m_pInputType; (*ppType)->AddRef(); } LeaveCriticalSection(&m_critSec); return hr; } HRESULT CGrayscale::SetInputType( DWORD dwInputStreamID, IMFMediaType *pType, // Can be nullptr to clear the input type. DWORD dwFlags ) { // Validate flags. if (dwFlags & ~MFT_SET_TYPE_TEST_ONLY) { return E_INVALIDARG; } EnterCriticalSection(&m_critSec); if (!IsValidInputStream(dwInputStreamID)) { LeaveCriticalSection(&m_critSec); return MF_E_INVALIDSTREAMNUMBER; } HRESULT hr = S_OK; // Does the caller want us to set the type, or just test it? BOOL bReallySet = ((dwFlags & MFT_SET_TYPE_TEST_ONLY) == 0); // If we have an input sample, the client cannot change the type now. if (HasPendingOutput()) { hr = MF_E_TRANSFORM_CANNOT_CHANGE_MEDIATYPE_WHILE_PROCESSING; goto done; } // Validate the type, if non-nullptr. if (pType) { hr = OnCheckInputType(pType); if (FAILED(hr)) { goto done; } } // The type is OK. Set the type, unless the caller was just testing. if (bReallySet) { OnSetInputType(pType); // When the type changes, end streaming. hr = EndStreaming(); } done: LeaveCriticalSection(&m_critSec); return hr; } HRESULT CGrayscale::SetOutputType( DWORD dwOutputStreamID, IMFMediaType *pType, // Can be nullptr to clear the output type. DWORD dwFlags ) { // Validate flags. if (dwFlags & ~MFT_SET_TYPE_TEST_ONLY) { return E_INVALIDARG; } EnterCriticalSection(&m_critSec); if (!IsValidOutputStream(dwOutputStreamID)) { LeaveCriticalSection(&m_critSec); return MF_E_INVALIDSTREAMNUMBER; } HRESULT hr = S_OK; // Does the caller want us to set the type, or just test it? BOOL bReallySet = ((dwFlags & MFT_SET_TYPE_TEST_ONLY) == 0); // If we have an input sample, the client cannot change the type now. if (HasPendingOutput()) { hr = MF_E_TRANSFORM_CANNOT_CHANGE_MEDIATYPE_WHILE_PROCESSING; goto done; } // Validate the type, if non-nullptr. if (pType) { hr = OnCheckOutputType(pType); if (FAILED(hr)) { goto done; } } // The type is OK. Set the type, unless the caller was just testing. if (bReallySet) { OnSetOutputType(pType); // When the type changes, end streaming. hr = EndStreaming(); } done: LeaveCriticalSection(&m_critSec); return hr; } // Returns the current input type. HRESULT CGrayscale::GetInputCurrentType( DWORD dwInputStreamID, IMFMediaType **ppType ) { HRESULT hr = S_OK; EnterCriticalSection(&m_critSec); if (!IsValidInputStream(dwInputStreamID)) { hr = MF_E_INVALIDSTREAMNUMBER; } else if (!m_pInputType) { hr = MF_E_TRANSFORM_TYPE_NOT_SET; } else { *ppType = m_pInputType; (*ppType)->AddRef(); } LeaveCriticalSection(&m_critSec); return hr; } // Returns the current output type. HRESULT CGrayscale::GetOutputCurrentType( DWORD dwOutputStreamID, IMFMediaType **ppType ) { HRESULT hr = S_OK; EnterCriticalSection(&m_critSec); if (!IsValidOutputStream(dwOutputStreamID)) { hr = MF_E_INVALIDSTREAMNUMBER; } else if (!m_pOutputType) { hr = MF_E_TRANSFORM_TYPE_NOT_SET; } else { *ppType = m_pOutputType; (*ppType)->AddRef(); } LeaveCriticalSection(&m_critSec); return hr; } // Query if the MFT is accepting more input. HRESULT CGrayscale::GetInputStatus( DWORD dwInputStreamID, DWORD *pdwFlags ) { EnterCriticalSection(&m_critSec); if (!IsValidInputStream(dwInputStreamID)) { LeaveCriticalSection(&m_critSec); return MF_E_INVALIDSTREAMNUMBER; } // If an input sample is already queued, do not accept another sample until the // client calls ProcessOutput or Flush. // NOTE: It is possible for an MFT to accept more than one input sample. For // example, this might be required in a video decoder if the frames do not // arrive in temporal order. In the case, the decoder must hold a queue of // samples. For the video effect, each sample is transformed independently, so // there is no reason to queue multiple input samples. if (m_pSample == nullptr) { *pdwFlags = MFT_INPUT_STATUS_ACCEPT_DATA; } else { *pdwFlags = 0; } LeaveCriticalSection(&m_critSec); return S_OK; } // Query if the MFT can produce output. HRESULT CGrayscale::GetOutputStatus(DWORD *pdwFlags) { EnterCriticalSection(&m_critSec); // The MFT can produce an output sample if (and only if) there an input sample. if (m_pSample != nullptr) { *pdwFlags = MFT_OUTPUT_STATUS_SAMPLE_READY; } else { *pdwFlags = 0; } LeaveCriticalSection(&m_critSec); return S_OK; } //------------------------------------------------------------------- // SetOutputBounds // Sets the range of time stamps that the MFT will output. //------------------------------------------------------------------- HRESULT CGrayscale::SetOutputBounds( LONGLONG hnsLowerBound, LONGLONG hnsUpperBound ) { // Implementation of this method is optional. return E_NOTIMPL; } //------------------------------------------------------------------- // ProcessEvent // Sends an event to an input stream. //------------------------------------------------------------------- HRESULT CGrayscale::ProcessEvent( DWORD dwInputStreamID, IMFMediaEvent *pEvent ) { // This MFT does not handle any stream events, so the method can // return E_NOTIMPL. This tells the pipeline that it can stop // sending any more events to this MFT. return E_NOTIMPL; } //------------------------------------------------------------------- // ProcessMessage //------------------------------------------------------------------- HRESULT CGrayscale::ProcessMessage( MFT_MESSAGE_TYPE eMessage, ULONG_PTR ulParam ) { EnterCriticalSection(&m_critSec); HRESULT hr = S_OK; switch (eMessage) { case MFT_MESSAGE_COMMAND_FLUSH: // Flush the MFT. hr = OnFlush(); break; case MFT_MESSAGE_COMMAND_DRAIN: // Drain: Tells the MFT to reject further input until all pending samples are // processed. That is our default behavior already, so there is nothing to do. // // For a decoder that accepts a queue of samples, the MFT might need to drain // the queue in response to this command. break; case MFT_MESSAGE_SET_D3D_MANAGER: // Sets a pointer to the IDirect3DDeviceManager9 interface. // The pipeline should never send this message unless the MFT sets the MF_SA_D3D_AWARE // attribute set to TRUE. Because this MFT does not set MF_SA_D3D_AWARE, it is an error // to send the MFT_MESSAGE_SET_D3D_MANAGER message to the MFT. Return an error code in // this case. // NOTE: If this MFT were D3D-enabled, it would cache the IDirect3DDeviceManager9 // pointer for use during streaming. hr = E_NOTIMPL; break; case MFT_MESSAGE_NOTIFY_BEGIN_STREAMING: hr = BeginStreaming(); break; case MFT_MESSAGE_NOTIFY_END_STREAMING: hr = EndStreaming(); break; // The next two messages do not require any action from this MFT. case MFT_MESSAGE_NOTIFY_END_OF_STREAM: break; case MFT_MESSAGE_NOTIFY_START_OF_STREAM: break; } LeaveCriticalSection(&m_critSec); return hr; } // Process an input sample. HRESULT CGrayscale::ProcessInput( DWORD dwInputStreamID, IMFSample *pSample, DWORD dwFlags ) { if (dwFlags != 0) { return E_INVALIDARG; // dwFlags is reserved and must be zero. } HRESULT hr = S_OK; EnterCriticalSection(&m_critSec); // Validate the input stream number. if (!IsValidInputStream(dwInputStreamID)) { hr = MF_E_INVALIDSTREAMNUMBER; goto done; } // Check for valid media types. // The client must set input and output types before calling ProcessInput. if (!m_pInputType || !m_pOutputType) { hr = MF_E_NOTACCEPTING; goto done; } // Check if an input sample is already queued. if (m_pSample != nullptr) { hr = MF_E_NOTACCEPTING; // We already have an input sample. goto done; } // Initialize streaming. hr = BeginStreaming(); if (FAILED(hr)) { goto done; } // Cache the sample. We do the actual work in ProcessOutput. m_pSample = pSample; pSample->AddRef(); // Hold a reference count on the sample. done: LeaveCriticalSection(&m_critSec); return hr; } //------------------------------------------------------------------- // ProcessOutput // Process an output sample. //------------------------------------------------------------------- HRESULT CGrayscale::ProcessOutput( DWORD dwFlags, DWORD cOutputBufferCount, MFT_OUTPUT_DATA_BUFFER *pOutputSamples, // one per stream DWORD *pdwStatus ) { // Check input parameters... // This MFT does not accept any flags for the dwFlags parameter. // The only defined flag is MFT_PROCESS_OUTPUT_DISCARD_WHEN_NO_BUFFER. This flag // applies only when the MFT marks an output stream as lazy or optional. But this // MFT has no lazy or optional streams, so the flag is not valid. if (dwFlags != 0) { return E_INVALIDARG; } // There must be exactly one output buffer. if (cOutputBufferCount != 1) { return E_INVALIDARG; } // It must contain a sample. if (pOutputSamples[0].pSample == nullptr) { return E_INVALIDARG; } HRESULT hr = S_OK; IMFMediaBuffer *pInput = nullptr; IMFMediaBuffer *pOutput = nullptr; EnterCriticalSection(&m_critSec); // There must be an input sample available for processing. if (m_pSample == nullptr) { hr = MF_E_TRANSFORM_NEED_MORE_INPUT; goto done; } // Initialize streaming. hr = BeginStreaming(); if (FAILED(hr)) { goto done; } // Get the input buffer. hr = m_pSample->ConvertToContiguousBuffer(&pInput); if (FAILED(hr)) { goto done; } // Get the output buffer. hr = pOutputSamples[0].pSample->ConvertToContiguousBuffer(&pOutput); if (FAILED(hr)) { goto done; } hr = OnProcessOutput(pInput, pOutput); if (FAILED(hr)) { goto done; } // Set status flags. pOutputSamples[0].dwStatus = 0; *pdwStatus = 0; // Copy the duration and time stamp from the input sample, if present. LONGLONG hnsDuration = 0; LONGLONG hnsTime = 0; if (SUCCEEDED(m_pSample->GetSampleDuration(&hnsDuration))) { hr = pOutputSamples[0].pSample->SetSampleDuration(hnsDuration); if (FAILED(hr)) { goto done; } } if (SUCCEEDED(m_pSample->GetSampleTime(&hnsTime))) { hr = pOutputSamples[0].pSample->SetSampleTime(hnsTime); } done: SafeRelease(&m_pSample); // Release our input sample. SafeRelease(&pInput); SafeRelease(&pOutput); LeaveCriticalSection(&m_critSec); return hr; } // PRIVATE METHODS // All methods that follow are private to this MFT and are not part of the IMFTransform interface. // Create a partial media type from our list. // // dwTypeIndex: Index into the list of peferred media types. // ppmt: Receives a pointer to the media type. HRESULT CGrayscale::OnGetPartialType(DWORD dwTypeIndex, IMFMediaType **ppmt) { if (dwTypeIndex >= ARRAYSIZE(g_MediaSubtypes)) { return MF_E_NO_MORE_TYPES; } IMFMediaType *pmt = nullptr; HRESULT hr = MFCreateMediaType(&pmt); if (FAILED(hr)) { goto done; } hr = pmt->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video); if (FAILED(hr)) { goto done; } hr = pmt->SetGUID(MF_MT_SUBTYPE, g_MediaSubtypes[dwTypeIndex]); if (FAILED(hr)) { goto done; } *ppmt = pmt; (*ppmt)->AddRef(); done: SafeRelease(&pmt); return hr; } // Validate an input media type. HRESULT CGrayscale::OnCheckInputType(IMFMediaType *pmt) { assert(pmt != nullptr); HRESULT hr = S_OK; // If the output type is set, see if they match. if (m_pOutputType != nullptr) { DWORD flags = 0; hr = pmt->IsEqual(m_pOutputType, &flags); // IsEqual can return S_FALSE. Treat this as failure. if (hr != S_OK) { hr = MF_E_INVALIDMEDIATYPE; } } else { // Output type is not set. Just check this type. hr = OnCheckMediaType(pmt); } return hr; } // Validate an output media type. HRESULT CGrayscale::OnCheckOutputType(IMFMediaType *pmt) { assert(pmt != nullptr); HRESULT hr = S_OK; // If the input type is set, see if they match. if (m_pInputType != nullptr) { DWORD flags = 0; hr = pmt->IsEqual(m_pInputType, &flags); // IsEqual can return S_FALSE. Treat this as failure. if (hr != S_OK) { hr = MF_E_INVALIDMEDIATYPE; } } else { // Input type is not set. Just check this type. hr = OnCheckMediaType(pmt); } return hr; } // Validate a media type (input or output) HRESULT CGrayscale::OnCheckMediaType(IMFMediaType *pmt) { BOOL bFoundMatchingSubtype = FALSE; // Major type must be video. GUID major_type; HRESULT hr = pmt->GetGUID(MF_MT_MAJOR_TYPE, &major_type); if (FAILED(hr)) { goto done; } if (major_type != MFMediaType_Video) { hr = MF_E_INVALIDMEDIATYPE; goto done; } // Subtype must be one of the subtypes in our global list. // Get the subtype GUID. GUID subtype; hr = pmt->GetGUID(MF_MT_SUBTYPE, &subtype); if (FAILED(hr)) { goto done; } // Look for the subtype in our list of accepted types. for (DWORD i = 0; i < ARRAYSIZE(g_MediaSubtypes); i++) { if (subtype == g_MediaSubtypes[i]) { bFoundMatchingSubtype = TRUE; break; } } if (!bFoundMatchingSubtype) { hr = MF_E_INVALIDMEDIATYPE; // The MFT does not support this subtype. goto done; } // Reject single-field media types. UINT32 interlace = MFGetAttributeUINT32(pmt, MF_MT_INTERLACE_MODE, MFVideoInterlace_Progressive); if (interlace == MFVideoInterlace_FieldSingleUpper || interlace == MFVideoInterlace_FieldSingleLower) { hr = MF_E_INVALIDMEDIATYPE; } done: return hr; } // Set or clear the input media type. // // Prerequisite: The input type was already validated. void CGrayscale::OnSetInputType(IMFMediaType *pmt) { // if pmt is nullptr, clear the type. // if pmt is non-nullptr, set the type. SafeRelease(&m_pInputType); m_pInputType = pmt; if (m_pInputType) { m_pInputType->AddRef(); } // Update the format information. UpdateFormatInfo(); } // Set or clears the output media type. // // Prerequisite: The output type was already validated. void CGrayscale::OnSetOutputType(IMFMediaType *pmt) { // If pmt is nullptr, clear the type. Otherwise, set the type. SafeRelease(&m_pOutputType); m_pOutputType = pmt; if (m_pOutputType) { m_pOutputType->AddRef(); } } // Initialize streaming parameters. // // This method is called if the client sends the MFT_MESSAGE_NOTIFY_BEGIN_STREAMING // message, or when the client processes a sample, whichever happens first. HRESULT CGrayscale::BeginStreaming() { HRESULT hr = S_OK; if (!m_bStreamingInitialized) { // Get the configuration attributes. // Get the destination rectangle. RECT rcDest; hr = m_pAttributes->GetBlob(MFT_GRAYSCALE_DESTINATION_RECT, (UINT8*)&rcDest, sizeof(rcDest), nullptr); if (hr == MF_E_ATTRIBUTENOTFOUND || !ValidateRect(rcDest)) { // The client did not set this attribute, or the client provided an invalid rectangle. // Default to the entire image. m_rcDest = D2D1::RectU(0, 0, m_imageWidthInPixels, m_imageHeightInPixels); hr = S_OK; } else if (SUCCEEDED(hr)) { m_rcDest = D2D1::RectU(rcDest.left, rcDest.top, rcDest.right, rcDest.bottom); } else { goto done; } // Get the chroma transformations. float scale = (float)MFGetAttributeDouble(m_pAttributes, MFT_GRAYSCALE_SATURATION, 0.0f); float angle = (float)MFGetAttributeDouble(m_pAttributes, MFT_GRAYSCALE_CHROMA_ROTATION, 0.0f); m_transform = D2D1::Matrix3x2F::Scale(scale, scale) * D2D1::Matrix3x2F::Rotation(angle); m_bStreamingInitialized = true; } done: return hr; } // End streaming. // This method is called if the client sends an MFT_MESSAGE_NOTIFY_END_STREAMING // message, or when the media type changes. In general, it should be called whenever // the streaming parameters need to be reset. HRESULT CGrayscale::EndStreaming() { m_bStreamingInitialized = false; return S_OK; } // Generate output data. HRESULT CGrayscale::OnProcessOutput(IMFMediaBuffer *pIn, IMFMediaBuffer *pOut) { BYTE *pDest = nullptr; // Destination buffer. LONG lDestStride = 0; // Destination stride. BYTE *pSrc = nullptr; // Source buffer. LONG lSrcStride = 0; // Source stride. // Helper objects to lock the buffers. VideoBufferLock inputLock(pIn); VideoBufferLock outputLock(pOut); // Stride if the buffer does not support IMF2DBuffer LONG lDefaultStride = 0; HRESULT hr = GetDefaultStride(m_pInputType, &lDefaultStride); if (FAILED(hr)) { goto done; } // Lock the input buffer. hr = inputLock.LockBuffer(lDefaultStride, m_imageHeightInPixels, &pSrc, &lSrcStride); if (FAILED(hr)) { goto done; } // Lock the output buffer. hr = outputLock.LockBuffer(lDefaultStride, m_imageHeightInPixels, &pDest, &lDestStride); if (FAILED(hr)) { goto done; } // Invoke the image transform function. assert (m_pTransformFn != nullptr); if (m_pTransformFn) { (*m_pTransformFn)(m_transform, m_rcDest, pDest, lDestStride, pSrc, lSrcStride, m_imageWidthInPixels, m_imageHeightInPixels); } else { hr = E_UNEXPECTED; goto done; } // Set the data size on the output buffer. hr = pOut->SetCurrentLength(m_cbImageSize); // The VideoBufferLock class automatically unlocks the buffers. done: return hr; } // Flush the MFT. HRESULT CGrayscale::OnFlush() { // For this MFT, flushing just means releasing the input sample. SafeRelease(&m_pSample); return S_OK; } // Update the format information. This method is called whenever the // input type is set. HRESULT CGrayscale::UpdateFormatInfo() { HRESULT hr = S_OK; GUID subtype = GUID_NULL; m_imageWidthInPixels = 0; m_imageHeightInPixels = 0; m_cbImageSize = 0; m_pTransformFn = nullptr; if (m_pInputType != nullptr) { hr = m_pInputType->GetGUID(MF_MT_SUBTYPE, &subtype); if (FAILED(hr)) { goto done; } if (subtype == MFVideoFormat_YUY2) { m_pTransformFn = TransformImage_YUY2; } else if (subtype == MFVideoFormat_UYVY) { m_pTransformFn = TransformImage_UYVY; } else if (subtype == MFVideoFormat_NV12) { m_pTransformFn = TransformImage_NV12; } else { hr = E_UNEXPECTED; goto done; } hr = MFGetAttributeSize(m_pInputType, MF_MT_FRAME_SIZE, &m_imageWidthInPixels, &m_imageHeightInPixels); if (FAILED(hr)) { goto done; } // Calculate the image size (not including padding) hr = GetImageSize(subtype.Data1, m_imageWidthInPixels, m_imageHeightInPixels, &m_cbImageSize); } done: return hr; } // Calculate the size of the buffer needed to store the image. // fcc: The FOURCC code of the video format. HRESULT GetImageSize(DWORD fcc, UINT32 width, UINT32 height, DWORD* pcbImage) { HRESULT hr = S_OK; switch (fcc) { case FOURCC_YUY2: case FOURCC_UYVY: // check overflow if ((width > MAXDWORD / 2) || (width * 2 > MAXDWORD / height)) { hr = E_INVALIDARG; } else { // 16 bpp *pcbImage = width * height * 2; } break; case FOURCC_NV12: // check overflow if ((height/2 > MAXDWORD - height) || ((height + height/2) > MAXDWORD / width)) { hr = E_INVALIDARG; } else { // 12 bpp *pcbImage = width * (height + (height/2)); } break; default: hr = E_FAIL; // Unsupported type. } return hr; } // Get the default stride for a video format. HRESULT GetDefaultStride(IMFMediaType *pType, LONG *plStride) { LONG lStride = 0; // Try to get the default stride from the media type. HRESULT hr = pType->GetUINT32(MF_MT_DEFAULT_STRIDE, (UINT32*)&lStride); if (FAILED(hr)) { // Attribute not set. Try to calculate the default stride. GUID subtype = GUID_NULL; UINT32 width = 0; UINT32 height = 0; // Get the subtype and the image size. hr = pType->GetGUID(MF_MT_SUBTYPE, &subtype); if (SUCCEEDED(hr)) { hr = MFGetAttributeSize(pType, MF_MT_FRAME_SIZE, &width, &height); } if (SUCCEEDED(hr)) { if (subtype == MFVideoFormat_NV12) { lStride = width; } else if (subtype == MFVideoFormat_YUY2 || subtype == MFVideoFormat_UYVY) { lStride = ((width * 2) + 3) & ~3; } else { hr = E_INVALIDARG; } } // Set the attribute for later reference. if (SUCCEEDED(hr)) { (void)pType->SetUINT32(MF_MT_DEFAULT_STRIDE, UINT32(lStride)); } } if (SUCCEEDED(hr)) { *plStride = lStride; } return hr; } // Validate that a rectangle meets the following criteria: // // - All coordinates are non-negative. // - The rectangle is not flipped (top > bottom, left > right) // // These are the requirements for the destination rectangle. bool ValidateRect(const RECT& rc) { if (rc.left < 0 || rc.top < 0) { return false; } if (rc.left > rc.right || rc.top > rc.bottom) { return false; } return true; }プロジェクトに新しいモジュール定義ファイルを追加し、
GrayscaleTransform.defという名前を付けてから、次のコードを追加します。EXPORTS DllCanUnloadNow PRIVATE DllGetActivationFactory PRIVATE DllGetClassObject PRIVATE次のコードを使用して
dllmain.cppの内容を置き換えます。#include "pch.h" #include <initguid.h> #include <wrl\module.h> using namespace Microsoft::WRL; STDAPI_(BOOL) DllMain(_In_ HINSTANCE hInstance, _In_ DWORD reason, _In_opt_ void *reserved) { if (DLL_PROCESS_ATTACH == reason) { DisableThreadLibraryCalls(hInstance); } return TRUE; } STDAPI DllGetActivationFactory(_In_ HSTRING activatibleClassId, _COM_Outptr_ IActivationFactory **factory) { return Module<InProc>::GetModule().GetActivationFactory(activatibleClassId, factory); } STDAPI DllCanUnloadNow() { return Module<InProc>::GetModule().Terminate() ? S_OK : S_FALSE; } STDAPI DllGetClassObject(_In_ REFCLSID rclsid, _In_ REFIID riid, _COM_Outptr_ void **ppv) { return Module<InProc>::GetModule().GetClassObject(rclsid, riid, ppv); }プロジェクトの Property Pages ダイアログ ボックスで、次の Linker プロパティを設定します。
[入力] で、[モジュール定義ファイル] に
GrayScaleTransform.defを指定します。同様に [入力] で、
runtimeobject.lib、mfuuid.lib、mfplat.libを [追加の依存ファイル] プロパティに追加します。[Windows メタデータ] で、[Windows メタデータの生成] を [はい (/WINMD)] に設定します。
C# アプリから WRL とカスタム メディア ファンデーション コンポーネントを使用するには
MediaCaptureソリューションに C# の空のアプリ (ユニバーサル Windows) プロジェクトを追加します。 プロジェクトに MediaCapture などの名前を付けます。MediaCapture プロジェクトで、
GrayscaleTransformプロジェクトへの参照を追加します。 方法については、「方法: 参照マネージャーを使用して参照を追加または削除する」を参照してください。Package.appxmanifestの [機能] タブで、[マイク] と [Web カメラ] を選択します。 Web カメラから写真をキャプチャするために、両方の機能が必要です。MainPage.xamlで、このコードをルートのGrid要素に追加します。<StackPanel> <TextBlock x:Name="StatusBlock" Margin="10,10,0,0"/> <StackPanel Orientation="Horizontal" Grid.Row="1" Margin="0,10,0,0"> <Button x:Name="StartDevice" Click="StartDevice_Click" IsEnabled="true" Margin="10,0,10,0">StartDevice</Button> <Button x:Name="TakePhoto" Click="TakePhoto_Click" IsEnabled="false" Margin="0,0,10,0">TakePhoto</Button> </StackPanel> <StackPanel Orientation="Horizontal" Grid.Row="2" Margin="0,10,0,0"> <CheckBox x:Name="AddRemoveEffect" Margin="10,0,10,0" Content="Grayscale effect" IsEnabled="False" Checked="AddRemoveEffect_Checked" Unchecked="AddRemoveEffect_Unchecked"/> </StackPanel> <Image x:Name="CapturedImage" Width="320" Height="240" Margin="10,10,0,0" HorizontalAlignment="Left"/> </StackPanel>次のコードを使用して
MainPage.xaml.csの内容を置き換えます。using System; using Windows.Devices.Enumeration; using Windows.Media.Capture; using Windows.Media.Effects; using Windows.Media.MediaProperties; using Windows.Storage.Streams; using Windows.UI; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Media; using Windows.UI.Xaml.Media.Imaging; using Windows.UI.Xaml.Navigation; namespace MediaCapture { public sealed partial class MainPage : Page { // Captures photos from the webcam. private Windows.Media.Capture.MediaCapture mediaCapture; // Used to display status messages. private Brush statusBrush = new SolidColorBrush(Colors.Green); // Used to display error messages. private Brush exceptionBrush = new SolidColorBrush(Colors.Red); public MainPage() { this.InitializeComponent(); } // Shows a status message. private void ShowStatusMessage(string text) { StatusBlock.Foreground = statusBrush; StatusBlock.Text = text; } // Shows an error message. private void ShowExceptionMessage(Exception ex) { StatusBlock.Foreground = exceptionBrush; StatusBlock.Text = ex.Message; } // Click event handler for the "Start Device" button. private async void StartDevice_Click(object sender, RoutedEventArgs e) { try { StartDevice.IsEnabled = false; // Enumerate webcams. ShowStatusMessage("Enumerating webcams..."); var devInfoCollection = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture); if (devInfoCollection.Count == 0) { ShowStatusMessage("No webcams found"); return; } // Initialize the MediaCapture object, choosing the first found webcam. mediaCapture = new Windows.Media.Capture.MediaCapture(); var settings = new Windows.Media.Capture.MediaCaptureInitializationSettings(); settings.VideoDeviceId = devInfoCollection[0].Id; await mediaCapture.InitializeAsync(settings); // We can now take photos and enable the grayscale effect. TakePhoto.IsEnabled = true; AddRemoveEffect.IsEnabled = true; ShowStatusMessage("Device initialized successfully"); } catch (Exception ex) { ShowExceptionMessage(ex); } } // Takes a photo from the webcam and displays it. private async void TakePhoto_Click(object sender, RoutedEventArgs e) { try { ShowStatusMessage("Taking photo..."); TakePhoto.IsEnabled = false; // Capture the photo to an in-memory stream. var photoStream = new InMemoryRandomAccessStream(); await mediaCapture.CapturePhotoToStreamAsync(ImageEncodingProperties.CreateJpeg(), photoStream); ShowStatusMessage("Create photo file successful"); // Display the photo. var bmpimg = new BitmapImage(); photoStream.Seek(0); await bmpimg.SetSourceAsync(photoStream); CapturedImage.Source = bmpimg; TakePhoto.IsEnabled = true; ShowStatusMessage("Photo taken"); } catch (Exception ex) { ShowExceptionMessage(ex); TakePhoto.IsEnabled = true; } } // Enables the grayscale effect. private async void AddRemoveEffect_Checked(object sender, RoutedEventArgs e) { try { AddRemoveEffect.IsEnabled = false; VideoEffectDefinition def = new VideoEffectDefinition("GrayscaleTransform.GrayscaleEffect"); await mediaCapture.AddVideoEffectAsync(def, MediaStreamType.Photo); ShowStatusMessage("Add effect to video preview successful"); AddRemoveEffect.IsEnabled = true; } catch (Exception ex) { ShowExceptionMessage(ex); } } // Removes the grayscale effect. private async void AddRemoveEffect_Unchecked(object sender, RoutedEventArgs e) { try { AddRemoveEffect.IsEnabled = false; await mediaCapture.ClearEffectsAsync(Windows.Media.Capture.MediaStreamType.Photo); ShowStatusMessage("Remove effect from preview successful"); AddRemoveEffect.IsEnabled = true; } catch (Exception ex) { ShowExceptionMessage(ex); } } } }
次の図は、MediaCapture app を示します。
次のステップ
例では、既定の Web カメラから写真を 1 枚ずつキャプチャする方法を示します。 メディア拡張機能サンプルでは、それ以上のことを行います。 Web カメラ デバイスを列挙し、ローカル スキーム ハンドラーを使用する方法を示します。 また、このサンプルでは、個別の写真とビデオ ストリームの両方で機能する追加のメディア効果も示します。
関連項目
Windows ランタイム C++ テンプレート ライブラリ (WRL)
Microsoft メディア ファンデーション