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1 /*
2  * Copyright (C) 2022 The Android Open Source Project
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 express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 // #define LOG_NDEBUG 0
18 #define LOG_TAG "MonotonicFrameCounter"
19 
20 #include <utils/Log.h>
21 #include "MonotonicFrameCounter.h"
22 
23 namespace android::audioflinger {
24 
updateAndGetMonotonicFrameCount(int64_t newFrameCount,int64_t newTime)25 int64_t MonotonicFrameCounter::updateAndGetMonotonicFrameCount(
26         int64_t newFrameCount, int64_t newTime) {
27     if (newFrameCount < 0 || newTime < 0) {
28         const auto result = getLastReportedFrameCount();
29         ALOGW("%s: invalid (frame, time) pair newFrameCount:%lld newFrameCount:%lld,"
30                 " using %lld as frameCount",
31                 __func__, (long long) newFrameCount, (long long)newFrameCount,
32                 (long long)result);
33         return result;
34     }
35     if (newFrameCount < mLastReceivedFrameCount) {
36         const auto result = getLastReportedFrameCount();
37         ALOGW("%s: retrograde newFrameCount:%lld < mLastReceivedFrameCount:%lld,"
38                 " ignoring, returning %lld as frameCount",
39                 __func__, (long long) newFrameCount, (long long)mLastReceivedFrameCount,
40                 (long long)result);
41         return result;
42     }
43     // Input looks fine.
44     // For better granularity, we could consider extrapolation on newTime.
45     mLastReceivedFrameCount = newFrameCount;
46     return getLastReportedFrameCount();
47 }
48 
onFlush()49 int64_t MonotonicFrameCounter::onFlush() {
50     ALOGV("%s: Updating mOffsetFrameCount:%lld with mLastReceivedFrameCount:%lld",
51             __func__, (long long)mOffsetFrameCount, (long long)mLastReceivedFrameCount);
52     mOffsetFrameCount += mLastReceivedFrameCount;
53     mLastReceivedFrameCount = 0;
54     return mOffsetFrameCount;
55 }
56 
57 } // namespace android::audioflinger
58