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:
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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
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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
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19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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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
37namespace qcamera {
38
39#define CAMERA_NUM_VSYNC_INTERVAL_HISTORY  6
40
41class QCameraDisplay {
42public:
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
50private:
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