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/*
* Copyright 2019 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef CALL_ADAPTATION_RESOURCE_H_
#define CALL_ADAPTATION_RESOURCE_H_
#include <string>
#include <vector>
#include "absl/types/optional.h"
#include "api/scoped_refptr.h"
#include "call/adaptation/video_source_restrictions.h"
#include "call/adaptation/video_stream_input_state.h"
#include "rtc_base/ref_count.h"
#include "rtc_base/task_queue.h"
namespace webrtc {
class Resource;
enum class ResourceUsageState {
// Action is needed to minimze the load on this resource.
kOveruse,
// Increasing the load on this resource is desired, if possible.
kUnderuse,
};
const char* ResourceUsageStateToString(ResourceUsageState usage_state);
class ResourceListener {
public:
virtual ~ResourceListener();
// Informs the listener of a new measurement of resource usage. This means
// that |resource->usage_state()| is now up-to-date.
virtual void OnResourceUsageStateMeasured(
rtc::scoped_refptr<Resource> resource) = 0;
};
class Resource : public rtc::RefCountInterface {
public:
// By default, usage_state() is null until a measurement is made.
Resource();
~Resource() override;
void Initialize(rtc::TaskQueue* encoder_queue,
rtc::TaskQueue* resource_adaptation_queue);
void SetResourceListener(ResourceListener* listener);
absl::optional<ResourceUsageState> usage_state() const;
void ClearUsageState();
// This method allows the Resource to reject a proposed adaptation in the "up"
// direction if it predicts this would cause overuse of this resource. The
// default implementation unconditionally returns true (= allowed).
virtual bool IsAdaptationUpAllowed(
const VideoStreamInputState& input_state,
const VideoSourceRestrictions& restrictions_before,
const VideoSourceRestrictions& restrictions_after,
rtc::scoped_refptr<Resource> reason_resource) const;
virtual void OnAdaptationApplied(
const VideoStreamInputState& input_state,
const VideoSourceRestrictions& restrictions_before,
const VideoSourceRestrictions& restrictions_after,
rtc::scoped_refptr<Resource> reason_resource);
virtual std::string name() const = 0;
protected:
rtc::TaskQueue* encoder_queue() const;
rtc::TaskQueue* resource_adaptation_queue() const;
// Updates the usage state and informs all registered listeners.
void OnResourceUsageStateMeasured(ResourceUsageState usage_state);
private:
rtc::TaskQueue* encoder_queue_;
rtc::TaskQueue* resource_adaptation_queue_;
absl::optional<ResourceUsageState> usage_state_
RTC_GUARDED_BY(resource_adaptation_queue_);
ResourceListener* listener_ RTC_GUARDED_BY(resource_adaptation_queue_);
};
} // namespace webrtc
#endif // CALL_ADAPTATION_RESOURCE_H_
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