1 /* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved. 2 * 3 * Redistribution and use in source and binary forms, with or without 4 * modification, are permitted provided that the following conditions are 5 * met: 6 * * Redistributions of source code must retain the above copyright 7 * notice, this list of conditions and the following disclaimer. 8 * * Redistributions in binary form must reproduce the above 9 * copyright notice, this list of conditions and the following 10 * disclaimer in the documentation and/or other materials provided 11 * with the distribution. 12 * * Neither the name of The Linux Foundation nor the names of its 13 * contributors may be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 26 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 */ 29 30 #ifndef __QCAMERADISPLAY_H__ 31 #define __QCAMERADISPLAY_H__ 32 33 #include <gui/DisplayEventReceiver.h> 34 #include <android/looper.h> 35 #include <utils/Looper.h> 36 37 namespace qcamera { 38 39 #define CAMERA_NUM_VSYNC_INTERVAL_HISTORY 6 40 41 class QCameraDisplay { 42 public: 43 QCameraDisplay(); 44 ~QCameraDisplay(); 45 static int vsyncEventReceiverCamera(int fd, int events, void* data); 46 static void* vsyncThreadCamera(void * data); 47 void computeAverageVsyncInterval(nsecs_t currentVsyncTimeStamp); 48 nsecs_t computePresentationTimeStamp(nsecs_t frameTimeStamp); 49 50 private: 51 pthread_t mVsyncThreadCameraHandle; 52 nsecs_t mVsyncTimeStamp; 53 nsecs_t mAvgVsyncInterval; 54 nsecs_t mOldTimeStamp; 55 nsecs_t mVsyncIntervalHistory[CAMERA_NUM_VSYNC_INTERVAL_HISTORY]; 56 nsecs_t mVsyncHistoryIndex; 57 nsecs_t mAdditionalVsyncOffsetForWiggle; 58 uint32_t mThreadExit; 59 // Tunable property. Increasing this will increase the frame delay and will loose 60 // the real time display. 61 uint32_t mNum_vsync_from_vfe_isr_to_presentation_timestamp; 62 // Tunable property. Set the time stamp x ms prior to expected vsync so that 63 // it will be picked in that vsync 64 uint32_t mSet_timestamp_num_ms_prior_to_vsync; 65 // Tunable property for filtering timestamp wiggle when VFE ISR crosses 66 // over MDP ISR over a period. Typical scenario is VFE is running at 67 // 30.2 fps vs display running at 60 fps. 68 uint32_t mVfe_and_mdp_freq_wiggle_filter_max_ms; 69 uint32_t mVfe_and_mdp_freq_wiggle_filter_min_ms; 70 71 android::DisplayEventReceiver mDisplayEventReceiver; 72 }; 73 74 }; // namespace qcamera 75 76 #endif /* __QCAMERADISPLAY_H__ */ 77