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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