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/*
* Copyright 2019 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 PIPELINE_WATCHER_H_
#define PIPELINE_WATCHER_H_
#include <chrono>
#include <map>
#include <memory>
#include <C2Work.h>
namespace android {
/**
* PipelineWatcher watches the pipeline and infers the status of work items from
* events.
*/
class PipelineWatcher {
public:
typedef std::chrono::steady_clock Clock;
PipelineWatcher()
: mInputDelay(0),
mPipelineDelay(0),
mOutputDelay(0),
mSmoothnessFactor(0) {}
~PipelineWatcher() = default;
/**
* \param value the new input delay value
* \return this object
*/
PipelineWatcher &inputDelay(uint32_t value);
/**
* \param value the new pipeline delay value
* \return this object
*/
PipelineWatcher &pipelineDelay(uint32_t value);
/**
* \param value the new output delay value
* \return this object
*/
PipelineWatcher &outputDelay(uint32_t value);
/**
* \param value the new smoothness factor value
* \return this object
*/
PipelineWatcher &smoothnessFactor(uint32_t value);
/**
* Client queued a work item to the component.
*
* \param frameIndex input frame index of this work
* \param buffers input buffers of the queued work item
* \param queuedAt time when the client queued the buffer
*/
void onWorkQueued(
uint64_t frameIndex,
std::vector<std::shared_ptr<C2Buffer>> &&buffers,
const Clock::time_point &queuedAt);
/**
* The component released input buffers from a work item.
*
* \param frameIndex input frame index
* \param arrayIndex index of the buffer at the original |buffers| in
* onWorkQueued().
* \return buffers[arrayIndex]
*/
std::shared_ptr<C2Buffer> onInputBufferReleased(
uint64_t frameIndex, size_t arrayIndex);
/**
* The component finished processing a work item.
*
* \param frameIndex input frame index
*/
void onWorkDone(uint64_t frameIndex);
/**
* Flush the pipeline.
*/
void flush();
/**
* \return true if pipeline does not need more work items to proceed
* smoothly, considering delays and smoothness factor;
* false otherwise.
*/
bool pipelineFull() const;
/**
* Return elapsed processing time of a work item, nth from the longest
* processing time to the shortest.
*
* \param now current timestamp
* \param n nth work item, from the longest processing time to the
* shortest. It's a 0-based index.
* \return elapsed processing time of nth work item.
*/
Clock::duration elapsed(const Clock::time_point &now, size_t n) const;
private:
uint32_t mInputDelay;
uint32_t mPipelineDelay;
uint32_t mOutputDelay;
uint32_t mSmoothnessFactor;
struct Frame {
Frame(std::vector<std::shared_ptr<C2Buffer>> &&b,
const Clock::time_point &q)
: buffers(b),
queuedAt(q) {}
std::vector<std::shared_ptr<C2Buffer>> buffers;
const Clock::time_point queuedAt;
};
std::map<uint64_t, Frame> mFramesInPipeline;
};
} // namespace android
#endif // PIPELINE_WATCHER_H_
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