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41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
/* 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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#include "VideoUtils.h"
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#include "nsMathUtils.h"
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#include "prtypes.h"
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#include "mozilla/StandardInteger.h"
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// Converts from number of audio frames to microseconds, given the specified
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// audio rate.
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CheckedInt64 FramesToUsecs(PRInt64 aFrames, PRUint32 aRate) {
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return (CheckedInt64(aFrames) * USECS_PER_S) / aRate;
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}
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// Converts from microseconds to number of audio frames, given the specified
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// audio rate.
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CheckedInt64 UsecsToFrames(PRInt64 aUsecs, PRUint32 aRate) {
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return (CheckedInt64(aUsecs) * aRate) / USECS_PER_S;
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}
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static PRInt32 ConditionDimension(float aValue)
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{
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// This will exclude NaNs and too-big values.
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if (aValue > 1.0 && aValue <= PR_INT32_MAX)
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return PRInt32(NS_round(aValue));
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return 0;
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}
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void ScaleDisplayByAspectRatio(nsIntSize& aDisplay, float aAspectRatio)
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{
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if (aAspectRatio > 1.0) {
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// Increase the intrinsic width
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aDisplay.width = ConditionDimension(aAspectRatio * aDisplay.width);
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} else {
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// Increase the intrinsic height
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aDisplay.height = ConditionDimension(aDisplay.height / aAspectRatio);
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}
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}
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