LCOV - app.info - content/media/VideoUtils.cpp

LCOV - code coverage report
| Current view: | directory - content/media - VideoUtils.cpp (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 13 | 0 | 0.0 %
| Date: | 2012-06-02 | Functions: | 4 | 0 | 0.0 %

           1                 : /* ***** BEGIN LICENSE BLOCK *****
           2                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           3                 :  *
           4                 :  * The contents of this file are subject to the Mozilla Public License Version
           5                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           6                 :  * the License. You may obtain a copy of the License at
           7                 :  * http://www.mozilla.org/MPL/
           8                 :  *
           9                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          10                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          11                 :  * for the specific language governing rights and limitations under the
          12                 :  * License.
          13                 :  *
          14                 :  * The Original Code is Mozilla code.
          15                 :  *
          16                 :  * The Initial Developer of the Original Code is
          17                 :  * the Mozilla Foundation.
          18                 :  * Portions created by the Initial Developer are Copyright (C) 2010
          19                 :  * the Initial Developer. All Rights Reserved.
          20                 :  *
          21                 :  * Contributor(s):
          22                 :  *  Chris Pearce <chris@pearce.org.nz>
          23                 :  *
          24                 :  * Alternatively, the contents of this file may be used under the terms of
          25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
          26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          28                 :  * of those above. If you wish to allow use of your version of this file only
          29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          30                 :  * use your version of this file under the terms of the MPL, indicate your
          31                 :  * decision by deleting the provisions above and replace them with the notice
          32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          33                 :  * the provisions above, a recipient may use your version of this file under
          34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          35                 :  *
          36                 :  * ***** END LICENSE BLOCK ***** */
          37                 :
          38                 : #include "VideoUtils.h"
          39                 : #include "nsMathUtils.h"
          40                 : #include "prtypes.h"
          41                 :
          42                 : #include "mozilla/StandardInteger.h"
          43                 :
          44                 : // Converts from number of audio frames to microseconds, given the specified
          45                 : // audio rate.
          46               0 : CheckedInt64 FramesToUsecs(PRInt64 aFrames, PRUint32 aRate) {
          47               0 :   return (CheckedInt64(aFrames) * USECS_PER_S) / aRate;
          48                 : }
          49                 :
          50                 : // Converts from microseconds to number of audio frames, given the specified
          51                 : // audio rate.
          52               0 : CheckedInt64 UsecsToFrames(PRInt64 aUsecs, PRUint32 aRate) {
          53               0 :   return (CheckedInt64(aUsecs) * aRate) / USECS_PER_S;
          54                 : }
          55                 :
          56               0 : static PRInt32 ConditionDimension(float aValue)
          57                 : {
          58                 :   // This will exclude NaNs and too-big values.
          59               0 :   if (aValue > 1.0 && aValue <= PR_INT32_MAX)
          60               0 :     return PRInt32(NS_round(aValue));
          61               0 :   return 0;
          62                 : }
          63                 :
          64               0 : void ScaleDisplayByAspectRatio(nsIntSize& aDisplay, float aAspectRatio)
          65                 : {
          66               0 :   if (aAspectRatio > 1.0) {
          67                 :     // Increase the intrinsic width
          68               0 :     aDisplay.width = ConditionDimension(aAspectRatio * aDisplay.width);
          69                 :   } else {
          70                 :     // Increase the intrinsic height
          71               0 :     aDisplay.height = ConditionDimension(aDisplay.height / aAspectRatio);
          72                 :   }
          73               0 : }

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