1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18
19 #include "time_comparison_utils.h"
20 #include "media_clock_converter.h"
21
22
IsEarlier(uint32 aTimeA,uint32 aTimeB,uint32 & delta)23 OSCL_EXPORT_REF bool PVTimeComparisonUtils::IsEarlier(uint32 aTimeA, uint32 aTimeB, uint32& delta)
24 {
25 delta = aTimeB - aTimeA;
26 if (delta < WRAP_THRESHOLD)
27 return true;
28 delta = 0 - delta;
29 return false;
30 }
31
CheckTimeWindow(PVMFTimestamp aTimeStamp,uint32 aClock,uint32 aEarlyMargin,uint32 aLateMargin,uint32 & aDelta)32 OSCL_EXPORT_REF PVTimeComparisonUtils::MediaTimeStatus PVTimeComparisonUtils::CheckTimeWindow(PVMFTimestamp aTimeStamp, uint32 aClock,
33 uint32 aEarlyMargin, uint32 aLateMargin, uint32 &aDelta)
34 {
35 bool flag = IsEarlier(aClock, aTimeStamp, aDelta);
36
37 if (0 == aDelta)
38 {
39 return MEDIA_ONTIME_WITHIN_WINDOW;
40 }
41
42 if (flag)
43 {
44 if (aDelta < aEarlyMargin)
45 return MEDIA_EARLY_WITHIN_WINDOW;
46 else
47 return MEDIA_EARLY_OUTSIDE_WINDOW;
48 }
49 else if (aDelta < aLateMargin)
50 {
51 return MEDIA_LATE_WITHIN_WINDOW;
52 }
53
54 return MEDIA_LATE_OUTSIDE_WINDOW;
55 }
56