103 lines
2.9 KiB
C++
Executable File
103 lines
2.9 KiB
C++
Executable File
/*
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* Copyright 2014, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef VIDEO_FRAME_SCHEDULER_H_
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#define VIDEO_FRAME_SCHEDULER_H_
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#include <utils/RefBase.h>
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#include <utils/Timers.h>
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#include <media/stagefright/foundation/ABase.h>
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namespace android {
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class ISurfaceComposer;
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struct VideoFrameScheduler : public RefBase {
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VideoFrameScheduler();
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// (re)initialize scheduler
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void init(float videoFps = -1);
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// use in case of video render-time discontinuity, e.g. seek
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void restart();
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// get adjusted nanotime for a video frame render at renderTime
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nsecs_t schedule(nsecs_t renderTime);
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// returns the vsync period for the main display
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nsecs_t getVsyncPeriod();
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// returns the current frames-per-second, or 0.f if not primed
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float getFrameRate();
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void release();
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static const size_t kHistorySize = 8;
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protected:
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virtual ~VideoFrameScheduler();
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private:
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struct PLL {
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PLL();
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// reset PLL to new PLL
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void reset(float fps = -1);
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// keep current estimate, but restart phase
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void restart();
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// returns period or 0 if not yet primed
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nsecs_t addSample(nsecs_t time);
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nsecs_t getPeriod() const;
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private:
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nsecs_t mPeriod;
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nsecs_t mPhase;
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bool mPrimed; // have an estimate for the period
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size_t mSamplesUsedForPriming;
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nsecs_t mLastTime; // last input time
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nsecs_t mRefitAt; // next input time to fit at
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size_t mNumSamples; // can go past kHistorySize
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nsecs_t mTimes[kHistorySize];
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void test();
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// returns whether fit was successful
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bool fit(nsecs_t phase, nsecs_t period, size_t numSamples,
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int64_t *a, int64_t *b, int64_t *err);
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void prime(size_t numSamples);
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};
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void updateVsync();
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nsecs_t mVsyncTime; // vsync timing from display
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nsecs_t mVsyncPeriod;
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nsecs_t mVsyncRefreshAt; // next time to refresh timing info
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nsecs_t mLastVsyncTime; // estimated vsync time for last frame
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nsecs_t mTimeCorrection; // running adjustment
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PLL mPll; // PLL for video frame rate based on render time
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sp<ISurfaceComposer> mComposer;
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DISALLOW_EVIL_CONSTRUCTORS(VideoFrameScheduler);
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};
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} // namespace android
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#endif // VIDEO_FRAME_SCHEDULER_H_
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