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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 "Parameters.h"
     28 #include "FrameProcessor.h"
     29 
     30 namespace android {
     31 
     32 class Camera2Client;
     33 
     34 namespace camera2 {
     35 
     36 class ZslProcessorInterface;
     37 class BurstCapture;
     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     CaptureSequencer(wp<Camera2Client> client);
     48     ~CaptureSequencer();
     49 
     50     // Get reference to the ZslProcessor, which holds the ZSL buffers and frames
     51     void setZslProcessor(wp<ZslProcessorInterface> 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 from the frame processor
     65     virtual void onFrameAvailable(int32_t requestId, const CameraMetadata &frame);
     66 
     67     // Notifications from the JPEG processor
     68     void onCaptureAvailable(nsecs_t timestamp, sp<MemoryBase> captureBuffer);
     69 
     70     void dump(int fd, const Vector<String16>& args);
     71 
     72   private:
     73     /**
     74      * Accessed by other threads
     75      */
     76     Mutex mInputMutex;
     77 
     78     bool mStartCapture;
     79     bool mBusy;
     80     Condition mStartCaptureSignal;
     81 
     82     bool mNewAEState;
     83     uint8_t mAEState;
     84     int mAETriggerId;
     85     Condition mNewNotifySignal;
     86 
     87     bool mNewFrameReceived;
     88     int32_t mNewFrameId;
     89     CameraMetadata mNewFrame;
     90     Condition mNewFrameSignal;
     91 
     92     bool mNewCaptureReceived;
     93     nsecs_t mCaptureTimestamp;
     94     sp<MemoryBase> mCaptureBuffer;
     95     Condition mNewCaptureSignal;
     96 
     97     bool mShutterNotified;
     98 
     99     /**
    100      * Internal to CaptureSequencer
    101      */
    102     static const nsecs_t kWaitDuration = 100000000; // 100 ms
    103     static const int kMaxTimeoutsForPrecaptureStart = 10; // 1 sec
    104     static const int kMaxTimeoutsForPrecaptureEnd = 20;  // 2 sec
    105     static const int kMaxTimeoutsForCaptureEnd    = 40;  // 4 sec
    106 
    107     wp<Camera2Client> mClient;
    108     wp<ZslProcessorInterface> mZslProcessor;
    109     sp<BurstCapture> mBurstCapture;
    110 
    111     enum CaptureState {
    112         IDLE,
    113         START,
    114         ZSL_START,
    115         ZSL_WAITING,
    116         ZSL_REPROCESSING,
    117         STANDARD_START,
    118         STANDARD_PRECAPTURE_WAIT,
    119         STANDARD_CAPTURE,
    120         STANDARD_CAPTURE_WAIT,
    121         BURST_CAPTURE_START,
    122         BURST_CAPTURE_WAIT,
    123         DONE,
    124         ERROR,
    125         NUM_CAPTURE_STATES
    126     } mCaptureState;
    127     static const char* kStateNames[];
    128     int mStateTransitionCount;
    129     Mutex mStateMutex; // Guards mCaptureState
    130     Condition mStateChanged;
    131 
    132     typedef CaptureState (CaptureSequencer::*StateManager)(sp<Camera2Client> &client);
    133     static const StateManager kStateManagers[];
    134 
    135     CameraMetadata mCaptureRequest;
    136 
    137     int mTriggerId;
    138     int mTimeoutCount;
    139     bool mAeInPrecapture;
    140 
    141     int32_t mCaptureId;
    142     int mMsgType;
    143 
    144     // Main internal methods
    145 
    146     virtual bool threadLoop();
    147 
    148     CaptureState manageIdle(sp<Camera2Client> &client);
    149     CaptureState manageStart(sp<Camera2Client> &client);
    150 
    151     CaptureState manageZslStart(sp<Camera2Client> &client);
    152     CaptureState manageZslWaiting(sp<Camera2Client> &client);
    153     CaptureState manageZslReprocessing(sp<Camera2Client> &client);
    154 
    155     CaptureState manageStandardStart(sp<Camera2Client> &client);
    156     CaptureState manageStandardPrecaptureWait(sp<Camera2Client> &client);
    157     CaptureState manageStandardCapture(sp<Camera2Client> &client);
    158     CaptureState manageStandardCaptureWait(sp<Camera2Client> &client);
    159 
    160     CaptureState manageBurstCaptureStart(sp<Camera2Client> &client);
    161     CaptureState manageBurstCaptureWait(sp<Camera2Client> &client);
    162 
    163     CaptureState manageDone(sp<Camera2Client> &client);
    164 
    165     // Utility methods
    166 
    167     status_t updateCaptureRequest(const Parameters &params,
    168             sp<Camera2Client> &client);
    169 
    170     // Emit Shutter/Raw callback to java, and maybe play a shutter sound
    171     static void shutterNotifyLocked(const Parameters &params,
    172             sp<Camera2Client> client, int msgType);
    173 };
    174 
    175 }; // namespace camera2
    176 }; // namespace android
    177 
    178 #endif
    179