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      1 /*
      2  * Copyright (C) 2012 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 #ifndef ANDROID_SERVERS_CAMERA_CAMERA2_CAPTURESEQUENCER_H
     18 #define ANDROID_SERVERS_CAMERA_CAMERA2_CAPTURESEQUENCER_H
     19 
     20 #include <binder/MemoryBase.h>
     21 #include <utils/Thread.h>
     22 #include <utils/String16.h>
     23 #include <utils/Vector.h>
     24 #include <utils/Mutex.h>
     25 #include <utils/Condition.h>
     26 #include "camera/CameraMetadata.h"
     27 #include "camera/CaptureResult.h"
     28 #include "Parameters.h"
     29 #include "FrameProcessor.h"
     30 
     31 namespace android {
     32 
     33 class Camera2Client;
     34 
     35 namespace camera2 {
     36 
     37 class ZslProcessor;
     38 
     39 /**
     40  * Manages the still image capture process for
     41  * zero-shutter-lag, regular, and video snapshots.
     42  */
     43 class CaptureSequencer:
     44             virtual public Thread,
     45             virtual public FrameProcessor::FilteredListener {
     46   public:
     47     explicit CaptureSequencer(wp<Camera2Client> client);
     48     ~CaptureSequencer();
     49 
     50     // Get reference to the ZslProcessor, which holds the ZSL buffers and frames
     51     void setZslProcessor(const wp<ZslProcessor>& processor);
     52 
     53     // Begin still image capture
     54     status_t startCapture(int msgType);
     55 
     56     // Wait until current image capture completes; returns immediately if no
     57     // capture is active. Returns TIMED_OUT if capture does not complete during
     58     // the specified duration.
     59     status_t waitUntilIdle(nsecs_t timeout);
     60 
     61     // Notifications about AE state changes
     62     void notifyAutoExposure(uint8_t newState, int triggerId);
     63 
     64     // Notifications about shutter (capture start)
     65     void notifyShutter(const CaptureResultExtras& resultExtras,
     66                        nsecs_t timestamp);
     67 
     68     // Notification from the frame processor
     69     virtual void onResultAvailable(const CaptureResult &result);
     70 
     71     // Notifications from the JPEG processor
     72     void onCaptureAvailable(nsecs_t timestamp, const sp<MemoryBase>& captureBuffer, bool captureError);
     73 
     74     void dump(int fd, const Vector<String16>& args);
     75 
     76   private:
     77     /**
     78      * Accessed by other threads
     79      */
     80     Mutex mInputMutex;
     81 
     82     bool mStartCapture;
     83     bool mBusy;
     84     Condition mStartCaptureSignal;
     85 
     86     bool mNewAEState;
     87     uint8_t mAEState;
     88     int mAETriggerId;
     89     Condition mNewNotifySignal;
     90 
     91     bool mNewFrameReceived;
     92     int32_t mNewFrameId;
     93     CameraMetadata mNewFrame;
     94     Condition mNewFrameSignal;
     95 
     96     bool mNewCaptureReceived;
     97     int32_t mNewCaptureErrorCnt;
     98     nsecs_t mCaptureTimestamp;
     99     sp<MemoryBase> mCaptureBuffer;
    100     Condition mNewCaptureSignal;
    101 
    102     bool mShutterNotified; // Has CaptureSequencer sent shutter to Client
    103     bool mHalNotifiedShutter; // Has HAL sent shutter to CaptureSequencer
    104     int32_t mShutterCaptureId; // The captureId which is waiting for shutter notification
    105     Condition mShutterNotifySignal;
    106 
    107     /**
    108      * Internal to CaptureSequencer
    109      */
    110     static const nsecs_t kWaitDuration = 100000000; // 100 ms
    111     static const int kMaxTimeoutsForPrecaptureStart = 10; // 1 sec
    112     static const int kMaxTimeoutsForPrecaptureEnd = 20;  // 2 sec
    113     static const int kMaxTimeoutsForCaptureEnd    = 40;  // 4 sec
    114     static const int kMaxRetryCount = 3; // 3 retries in case of buffer drop
    115 
    116     wp<Camera2Client> mClient;
    117     wp<ZslProcessor> mZslProcessor;
    118 
    119     enum CaptureState {
    120         IDLE,
    121         START,
    122         ZSL_START,
    123         ZSL_WAITING,
    124         ZSL_REPROCESSING,
    125         STANDARD_START,
    126         STANDARD_PRECAPTURE_WAIT,
    127         STANDARD_CAPTURE,
    128         STANDARD_CAPTURE_WAIT,
    129         DONE,
    130         ERROR,
    131         NUM_CAPTURE_STATES
    132     } mCaptureState;
    133     static const char* kStateNames[];
    134     int mStateTransitionCount;
    135     Mutex mStateMutex; // Guards mCaptureState
    136     Condition mStateChanged;
    137 
    138     typedef CaptureState (CaptureSequencer::*StateManager)(sp<Camera2Client> &client);
    139     static const StateManager kStateManagers[];
    140 
    141     CameraMetadata mCaptureRequest;
    142 
    143     int mTriggerId;
    144     int mTimeoutCount;
    145     bool mAeInPrecapture;
    146 
    147     int32_t mCaptureId;
    148     int mMsgType;
    149 
    150     // Main internal methods
    151 
    152     virtual bool threadLoop();
    153 
    154     CaptureState manageIdle(sp<Camera2Client> &client);
    155     CaptureState manageStart(sp<Camera2Client> &client);
    156 
    157     CaptureState manageZslStart(sp<Camera2Client> &client);
    158     CaptureState manageZslWaiting(sp<Camera2Client> &client);
    159     CaptureState manageZslReprocessing(sp<Camera2Client> &client);
    160 
    161     CaptureState manageStandardStart(sp<Camera2Client> &client);
    162     CaptureState manageStandardPrecaptureWait(sp<Camera2Client> &client);
    163     CaptureState manageStandardCapture(sp<Camera2Client> &client);
    164     CaptureState manageStandardCaptureWait(sp<Camera2Client> &client);
    165 
    166     CaptureState manageDone(sp<Camera2Client> &client);
    167 
    168     // Utility methods
    169 
    170     status_t updateCaptureRequest(const Parameters &params,
    171             sp<Camera2Client> &client);
    172 
    173     // Emit Shutter/Raw callback to java, and maybe play a shutter sound
    174     static void shutterNotifyLocked(const Parameters &params,
    175             const sp<Camera2Client>& client, int msgType);
    176 };
    177 
    178 }; // namespace camera2
    179 }; // namespace android
    180 
    181 #endif
    182