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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_SERVERS_CAMERA3_ZSL_STREAM_H
#define ANDROID_SERVERS_CAMERA3_ZSL_STREAM_H
#include <utils/RefBase.h>
#include <gui/Surface.h>
#include <gui/RingBufferConsumer.h>
#include "Camera3OutputStream.h"
namespace android {
namespace camera3 {
/**
* A class for managing a single opaque ZSL stream to/from the camera device.
* This acts as a bidirectional stream at the HAL layer, caching and discarding
* most output buffers, and when directed, pushes a buffer back to the HAL for
* processing.
*/
class Camera3ZslStream :
public Camera3OutputStream {
public:
/**
* Set up a ZSL stream of a given resolution. Depth is the number of buffers
* cached within the stream that can be retrieved for input.
*/
Camera3ZslStream(int id, uint32_t width, uint32_t height, int depth);
~Camera3ZslStream();
virtual void dump(int fd, const Vector<String16> &args) const;
enum { NO_BUFFER_AVAILABLE = BufferQueue::NO_BUFFER_AVAILABLE };
/**
* Locate a buffer matching this timestamp in the RingBufferConsumer,
* and mark it to be queued at the next getInputBufferLocked invocation.
*
* Errors: Returns NO_BUFFER_AVAILABLE if we could not find a match.
*
*/
status_t enqueueInputBufferByTimestamp(nsecs_t timestamp,
nsecs_t* actualTimestamp);
/**
* Clears the buffers that can be used by enqueueInputBufferByTimestamp
*/
status_t clearInputRingBuffer();
protected:
/**
* Camera3OutputStreamInterface implementation
*/
status_t setTransform(int transform);
private:
int mDepth;
// Input buffers pending to be queued into HAL
List<sp<RingBufferConsumer::PinnedBufferItem> > mInputBufferQueue;
sp<RingBufferConsumer> mProducer;
// Input buffers in flight to HAL
Vector<sp<RingBufferConsumer::PinnedBufferItem> > mBuffersInFlight;
/**
* Camera3Stream interface
*/
// getInputBuffer/returnInputBuffer operate the input stream side of the
// ZslStream.
virtual status_t getInputBufferLocked(camera3_stream_buffer *buffer);
virtual status_t returnInputBufferLocked(
const camera3_stream_buffer &buffer);
// Actual body to return either input or output buffers
virtual status_t returnBufferCheckedLocked(
const camera3_stream_buffer &buffer,
nsecs_t timestamp,
bool output,
/*out*/
sp<Fence> *releaseFenceOut);
}; // class Camera3ZslStream
}; // namespace camera3
}; // namespace android
#endif
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