michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim:set ts=2 sw=2 sts=2 et cindent: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef WMFUtils_h
michael@0: #define WMFUtils_h
michael@0: 
michael@0: #include "WMF.h"
michael@0: #include "nsString.h"
michael@0: #include "nsRect.h"
michael@0: #include "VideoUtils.h"
michael@0: 
michael@0: // Various utilities shared by WMF backend files.
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: nsCString
michael@0: GetGUIDName(const GUID& guid);
michael@0: 
michael@0: // Returns true if the reader has a stream with the specified index.
michael@0: // Index can be a specific index, or one of:
michael@0: //   MF_SOURCE_READER_FIRST_VIDEO_STREAM
michael@0: //   MF_SOURCE_READER_FIRST_AUDIO_STREAM
michael@0: bool
michael@0: SourceReaderHasStream(IMFSourceReader* aReader, const DWORD aIndex);
michael@0: 
michael@0: // Auto manages the lifecycle of a PROPVARIANT.
michael@0: class AutoPropVar {
michael@0: public:
michael@0:   AutoPropVar() {
michael@0:     PropVariantInit(&mVar);
michael@0:   }
michael@0:   ~AutoPropVar() {
michael@0:     PropVariantClear(&mVar);
michael@0:   }
michael@0:   operator PROPVARIANT&() {
michael@0:     return mVar;
michael@0:   }
michael@0:   PROPVARIANT* operator->() {
michael@0:     return &mVar;
michael@0:   }
michael@0:   PROPVARIANT* operator&() {
michael@0:     return &mVar;
michael@0:   }
michael@0: private:
michael@0:   PROPVARIANT mVar;
michael@0: };
michael@0: 
michael@0: // Converts from microseconds to hundreds of nanoseconds.
michael@0: // We use microseconds for our timestamps, whereas WMF uses
michael@0: // hundreds of nanoseconds.
michael@0: inline int64_t
michael@0: UsecsToHNs(int64_t aUsecs) {
michael@0:   return aUsecs * 10;
michael@0: }
michael@0: 
michael@0: // Converts from hundreds of nanoseconds to microseconds.
michael@0: // We use microseconds for our timestamps, whereas WMF uses
michael@0: // hundreds of nanoseconds.
michael@0: inline int64_t
michael@0: HNsToUsecs(int64_t hNanoSecs) {
michael@0:   return hNanoSecs / 10;
michael@0: }
michael@0: 
michael@0: // Assigns aUnknown to *aInterface, and AddRef's it.
michael@0: // Helper for MSCOM QueryInterface implementations.
michael@0: HRESULT
michael@0: DoGetInterface(IUnknown* aUnknown, void** aInterface);
michael@0: 
michael@0: HRESULT
michael@0: HNsToFrames(int64_t aHNs, uint32_t aRate, int64_t* aOutFrames);
michael@0: 
michael@0: HRESULT
michael@0: FramesToUsecs(int64_t aSamples, uint32_t aRate, int64_t* aOutUsecs);
michael@0: 
michael@0: HRESULT
michael@0: GetDefaultStride(IMFMediaType *aType, uint32_t* aOutStride);
michael@0: 
michael@0: int32_t
michael@0: MFOffsetToInt32(const MFOffset& aOffset);
michael@0: 
michael@0: // Gets the sub-region of the video frame that should be displayed.
michael@0: // See: http://msdn.microsoft.com/en-us/library/windows/desktop/bb530115(v=vs.85).aspx
michael@0: HRESULT
michael@0: GetPictureRegion(IMFMediaType* aMediaType, nsIntRect& aOutPictureRegion);
michael@0: 
michael@0: // Returns the duration of a IMFSample in microseconds.
michael@0: // Returns -1 on failure.
michael@0: int64_t
michael@0: GetSampleDuration(IMFSample* aSample);
michael@0: 
michael@0: // Returns the presentation time of a IMFSample in microseconds.
michael@0: // Returns -1 on failure.
michael@0: int64_t
michael@0: GetSampleTime(IMFSample* aSample);
michael@0: 
michael@0: inline bool
michael@0: IsFlagSet(DWORD flags, DWORD pattern) {
michael@0:   return (flags & pattern) == pattern;
michael@0: }
michael@0: 
michael@0: } // namespace mozilla
michael@0: 
michael@0: #endif