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