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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_SERVERS_CAMERA_CAMERA2_CAPTURESEQUENCER_H
#define ANDROID_SERVERS_CAMERA_CAMERA2_CAPTURESEQUENCER_H
#include <binder/MemoryBase.h>
#include <utils/Thread.h>
#include <utils/String16.h>
#include <utils/Vector.h>
#include <utils/Mutex.h>
#include <utils/Condition.h>
#include "CameraMetadata.h"
#include "Parameters.h"
#include "FrameProcessor.h"
namespace android {
class Camera2Client;
namespace camera2 {
class ZslProcessor;
class BurstCapture;
/**
* Manages the still image capture process for
* zero-shutter-lag, regular, and video snapshots.
*/
class CaptureSequencer:
virtual public Thread,
virtual public FrameProcessor::FilteredListener {
public:
CaptureSequencer(wp<Camera2Client> client);
~CaptureSequencer();
// Get reference to the ZslProcessor, which holds the ZSL buffers and frames
void setZslProcessor(wp<ZslProcessor> processor);
// Begin still image capture
status_t startCapture();
// Wait until current image capture completes; returns immediately if no
// capture is active. Returns TIMED_OUT if capture does not complete during
// the specified duration.
status_t waitUntilIdle(nsecs_t timeout);
// Notifications about AE state changes
void notifyAutoExposure(uint8_t newState, int triggerId);
// Notifications from the frame processor
virtual void onFrameAvailable(int32_t frameId, const CameraMetadata &frame);
// Notifications from the JPEG processor
void onCaptureAvailable(nsecs_t timestamp, sp<MemoryBase> captureBuffer);
void dump(int fd, const Vector<String16>& args);
private:
/**
* Accessed by other threads
*/
Mutex mInputMutex;
bool mStartCapture;
bool mBusy;
Condition mStartCaptureSignal;
bool mNewAEState;
uint8_t mAEState;
int mAETriggerId;
Condition mNewNotifySignal;
bool mNewFrameReceived;
int32_t mNewFrameId;
CameraMetadata mNewFrame;
Condition mNewFrameSignal;
bool mNewCaptureReceived;
nsecs_t mCaptureTimestamp;
sp<MemoryBase> mCaptureBuffer;
Condition mNewCaptureSignal;
bool mShutterNotified;
/**
* Internal to CaptureSequencer
*/
static const nsecs_t kWaitDuration = 100000000; // 100 ms
static const int kMaxTimeoutsForPrecaptureStart = 2; // 200 ms
static const int kMaxTimeoutsForPrecaptureEnd = 20; // 2 sec
static const int kMaxTimeoutsForCaptureEnd = 40; // 4 sec
wp<Camera2Client> mClient;
wp<ZslProcessor> mZslProcessor;
sp<BurstCapture> mBurstCapture;
enum CaptureState {
IDLE,
START,
ZSL_START,
ZSL_WAITING,
ZSL_REPROCESSING,
STANDARD_START,
STANDARD_PRECAPTURE_WAIT,
STANDARD_CAPTURE,
STANDARD_CAPTURE_WAIT,
BURST_CAPTURE_START,
BURST_CAPTURE_WAIT,
DONE,
ERROR,
NUM_CAPTURE_STATES
} mCaptureState;
static const char* kStateNames[];
Mutex mStateMutex; // Guards mCaptureState
Condition mStateChanged;
typedef CaptureState (CaptureSequencer::*StateManager)(sp<Camera2Client> &client);
static const StateManager kStateManagers[];
CameraMetadata mCaptureRequest;
int mTriggerId;
int mTimeoutCount;
bool mAeInPrecapture;
int32_t mCaptureId;
// Main internal methods
virtual bool threadLoop();
CaptureState manageIdle(sp<Camera2Client> &client);
CaptureState manageStart(sp<Camera2Client> &client);
CaptureState manageZslStart(sp<Camera2Client> &client);
CaptureState manageZslWaiting(sp<Camera2Client> &client);
CaptureState manageZslReprocessing(sp<Camera2Client> &client);
CaptureState manageStandardStart(sp<Camera2Client> &client);
CaptureState manageStandardPrecaptureWait(sp<Camera2Client> &client);
CaptureState manageStandardCapture(sp<Camera2Client> &client);
CaptureState manageStandardCaptureWait(sp<Camera2Client> &client);
CaptureState manageBurstCaptureStart(sp<Camera2Client> &client);
CaptureState manageBurstCaptureWait(sp<Camera2Client> &client);
CaptureState manageDone(sp<Camera2Client> &client);
// Utility methods
status_t updateCaptureRequest(const Parameters ¶ms,
sp<Camera2Client> &client);
// Emit Shutter/Raw callback to java, and maybe play a shutter sound
static void shutterNotifyLocked(const Parameters ¶ms,
sp<Camera2Client> client);
};
}; // namespace camera2
}; // namespace android
#endif
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