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/*
* Copyright (C) 2013 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_HARDWARE_PRO_CAMERA_H
#define ANDROID_HARDWARE_PRO_CAMERA_H
#include <utils/Timers.h>
#include <utils/KeyedVector.h>
#include <gui/IGraphicBufferProducer.h>
#include <system/camera.h>
#include <camera/IProCameraCallbacks.h>
#include <camera/IProCameraUser.h>
#include <camera/Camera.h>
#include <camera/CameraMetadata.h>
#include <gui/CpuConsumer.h>
#include <gui/Surface.h>
#include <utils/Condition.h>
#include <utils/Mutex.h>
#include <camera/CameraBase.h>
struct camera_metadata;
namespace android {
// All callbacks on this class are concurrent
// (they come from separate threads)
class ProCameraListener : virtual public RefBase
{
public:
virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2) = 0;
// Lock has been acquired. Write operations now available.
virtual void onLockAcquired() = 0;
// Lock has been released with exclusiveUnlock.
virtual void onLockReleased() = 0;
// Lock has been stolen by another client.
virtual void onLockStolen() = 0;
// Lock free.
virtual void onTriggerNotify(int32_t msgType, int32_t ext1, int32_t ext2)
= 0;
// onFrameAvailable and OnResultReceived can come in with any order,
// use android.sensor.timestamp and LockedBuffer.timestamp to correlate them
/**
* A new metadata buffer has been received.
* -- Ownership of request passes on to the callee, free with
* free_camera_metadata.
*/
virtual void onResultReceived(int32_t frameId, camera_metadata* result) = 0;
// TODO: make onFrameAvailable pure virtual
// A new frame buffer has been received for this stream.
// -- This callback only fires for createStreamCpu streams
// -- A buffer may be obtained by calling cpuConsumer->lockNextBuffer
// -- Use buf.timestamp to correlate with result's android.sensor.timestamp
// -- The buffer should be accessed with CpuConsumer::lockNextBuffer
// and CpuConsumer::unlockBuffer
virtual void onFrameAvailable(int /*streamId*/,
const sp<CpuConsumer>& /*cpuConsumer*/) {
}
};
class ProCamera;
template <>
struct CameraTraits<ProCamera>
{
typedef ProCameraListener TCamListener;
typedef IProCameraUser TCamUser;
typedef IProCameraCallbacks TCamCallbacks;
};
class ProCamera :
public CameraBase<ProCamera>,
public BnProCameraCallbacks
{
public:
/**
* Connect a shared camera. By default access is restricted to read only
* (Lock free) operations. To be able to submit custom requests a lock needs
* to be acquired with exclusive[Try]Lock.
*/
static sp<ProCamera> connect(int cameraId);
virtual ~ProCamera();
/**
* Exclusive Locks:
* - We may request exclusive access to a camera if no other
* clients are using the camera. This works as a traditional
* client, writing/reading any camera state.
* - An application opening the camera (a regular 'Camera') will
* always steal away the exclusive lock from a ProCamera,
* this will call onLockReleased.
* - onLockAcquired will be called again once it is possible
* to again exclusively lock the camera.
*
*/
/**
* All exclusiveLock/unlock functions are asynchronous. The remote endpoint
* shall not block while waiting to acquire the lock. Instead the lock
* notifications will come in asynchronously on the listener.
*/
/**
* Attempt to acquire the lock instantly (non-blocking)
* - If this succeeds, you do not need to wait for onLockAcquired
* but the event will still be fired
*
* Returns -EBUSY if already locked. 0 on success.
*/
status_t exclusiveTryLock();
// always returns 0. wait for onLockAcquired before lock is acquired.
status_t exclusiveLock();
// release a lock if we have one, or cancel the lock request.
status_t exclusiveUnlock();
// exclusive lock = do whatever we want. no lock = read only.
bool hasExclusiveLock();
/**
* < 0 error, >= 0 the request ID. streaming to have the request repeat
* until cancelled.
* The request queue is flushed when a lock is released or stolen
* if not locked will return PERMISSION_DENIED
*/
int submitRequest(const struct camera_metadata* metadata,
bool streaming = false);
// if not locked will return PERMISSION_DENIED, BAD_VALUE if requestId bad
status_t cancelRequest(int requestId);
/**
* Ask for a stream to be enabled.
* Lock free. Service maintains counter of streams.
*/
status_t requestStream(int streamId);
// TODO: remove requestStream, its useless.
/**
* Delete a stream.
* Lock free.
*
* NOTE: As a side effect this cancels ALL streaming requests.
*
* Errors: BAD_VALUE if unknown stream ID.
* PERMISSION_DENIED if the stream wasn't yours
*/
status_t deleteStream(int streamId);
/**
* Create a new HW stream, whose sink will be the window.
* Lock free. Service maintains counter of streams.
* Errors: -EBUSY if too many streams created
*/
status_t createStream(int width, int height, int format,
const sp<Surface>& surface,
/*out*/
int* streamId);
/**
* Create a new HW stream, whose sink will be the SurfaceTexture.
* Lock free. Service maintains counter of streams.
* Errors: -EBUSY if too many streams created
*/
status_t createStream(int width, int height, int format,
const sp<IGraphicBufferProducer>& bufferProducer,
/*out*/
int* streamId);
status_t createStreamCpu(int width, int height, int format,
int heapCount,
/*out*/
sp<CpuConsumer>* cpuConsumer,
int* streamId);
status_t createStreamCpu(int width, int height, int format,
int heapCount,
bool synchronousMode,
/*out*/
sp<CpuConsumer>* cpuConsumer,
int* streamId);
// Create a request object from a template.
status_t createDefaultRequest(int templateId,
/*out*/
camera_metadata** request) const;
// Get static camera metadata
camera_metadata* getCameraInfo(int cameraId);
// Blocks until a frame is available (CPU streams only)
// - Obtain the frame data by calling CpuConsumer::lockNextBuffer
// - Release the frame data after use with CpuConsumer::unlockBuffer
// Return value:
// - >0 - number of frames available to be locked
// - <0 - error (refer to error codes)
// Error codes:
// -ETIMEDOUT if it took too long to get a frame
int waitForFrameBuffer(int streamId);
// Blocks until a metadata result is available
// - Obtain the metadata by calling consumeFrameMetadata()
// Error codes:
// -ETIMEDOUT if it took too long to get a frame
status_t waitForFrameMetadata();
// Get the latest metadata. This is destructive.
// - Calling this repeatedly will produce empty metadata objects.
// - Use waitForFrameMetadata to sync until new data is available.
CameraMetadata consumeFrameMetadata();
// Convenience method to drop frame buffers (CPU streams only)
// Return values:
// >=0 - number of frames dropped (up to count)
// <0 - error code
// Error codes:
// BAD_VALUE - invalid streamId or count passed
int dropFrameBuffer(int streamId, int count);
protected:
////////////////////////////////////////////////////////
// IProCameraCallbacks implementation
////////////////////////////////////////////////////////
virtual void notifyCallback(int32_t msgType,
int32_t ext,
int32_t ext2);
virtual void onLockStatusChanged(
IProCameraCallbacks::LockStatus newLockStatus);
virtual void onResultReceived(int32_t frameId,
camera_metadata* result);
private:
ProCamera(int cameraId);
class ProFrameListener : public CpuConsumer::FrameAvailableListener {
public:
ProFrameListener(wp<ProCamera> camera, int streamID) {
mCamera = camera;
mStreamId = streamID;
}
protected:
virtual void onFrameAvailable() {
sp<ProCamera> c = mCamera.promote();
if (c.get() != NULL) {
c->onFrameAvailable(mStreamId);
}
}
private:
wp<ProCamera> mCamera;
int mStreamId;
};
friend class ProFrameListener;
struct StreamInfo
{
StreamInfo(int streamId) {
this->streamID = streamId;
cpuStream = false;
frameReady = 0;
}
StreamInfo() {
streamID = -1;
cpuStream = false;
}
int streamID;
bool cpuStream;
sp<CpuConsumer> cpuConsumer;
bool synchronousMode;
sp<ProFrameListener> frameAvailableListener;
sp<Surface> stc;
int frameReady;
};
Condition mWaitCondition;
Mutex mWaitMutex;
static const nsecs_t mWaitTimeout = 1000000000; // 1sec
KeyedVector<int, StreamInfo> mStreams;
bool mMetadataReady;
CameraMetadata mLatestMetadata;
void onFrameAvailable(int streamId);
StreamInfo& getStreamInfo(int streamId);
friend class CameraBase;
};
}; // namespace android
#endif