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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