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74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is
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* the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Pearce <chris@pearce.org.nz>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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/StdInt.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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