| /* |
| * Copyright 2021 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef PLAYBACK_DURATION_ACCUMULATOR_H_ |
| |
| namespace android { |
| |
| // Accumulates playback duration by processing render times of individual frames and by ignoring |
| // frames rendered during inactive playbacks such as seeking, pausing, or re-buffering. |
| class PlaybackDurationAccumulator { |
| private: |
| // Controls the maximum delta between render times before considering the playback is not |
| // active and has stalled. |
| static const int64_t MAX_PRESENTATION_DURATION_NS = 500 * 1000 * 1000; |
| |
| public: |
| PlaybackDurationAccumulator() { |
| mPlaybackDurationNs = 0; |
| mPreviousRenderTimeNs = 0; |
| } |
| |
| // Process a render time expressed in nanoseconds. |
| void processRenderTime(int64_t newRenderTimeNs) { |
| // If we detect wrap-around or out of order frames, just ignore the duration for this |
| // and the next frame. |
| if (newRenderTimeNs < mPreviousRenderTimeNs) { |
| mPreviousRenderTimeNs = 0; |
| } |
| if (mPreviousRenderTimeNs > 0) { |
| int64_t presentationDurationNs = newRenderTimeNs - mPreviousRenderTimeNs; |
| if (presentationDurationNs < MAX_PRESENTATION_DURATION_NS) { |
| mPlaybackDurationNs += presentationDurationNs; |
| } |
| } |
| mPreviousRenderTimeNs = newRenderTimeNs; |
| } |
| |
| int64_t getDurationInSeconds() { |
| return mPlaybackDurationNs / 1000 / 1000 / 1000; // Nanoseconds to seconds. |
| } |
| |
| private: |
| // The playback duration accumulated so far. |
| int64_t mPlaybackDurationNs; |
| // The previous render time used to compute the next presentation duration. |
| int64_t mPreviousRenderTimeNs; |
| }; |
| |
| } |
| |
| #endif |
| |