165 lines
6.7 KiB
C++
165 lines
6.7 KiB
C++
/*
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* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_CALL_BITRATE_ALLOCATOR_H_
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#define WEBRTC_CALL_BITRATE_ALLOCATOR_H_
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#include <stdint.h>
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#include <list>
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#include <map>
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#include <utility>
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#include "webrtc/base/criticalsection.h"
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#include "webrtc/base/thread_annotations.h"
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namespace webrtc {
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// Used by all send streams with adaptive bitrate, to get the currently
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// allocated bitrate for the send stream. The current network properties are
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// given at the same time, to let the send stream decide about possible loss
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// protection.
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class BitrateAllocatorObserver {
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public:
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virtual void OnBitrateUpdated(uint32_t bitrate_bps,
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uint8_t fraction_loss,
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int64_t rtt) = 0;
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protected:
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virtual ~BitrateAllocatorObserver() {}
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};
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// Usage: this class will register multiple RtcpBitrateObserver's one at each
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// RTCP module. It will aggregate the results and run one bandwidth estimation
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// and push the result to the encoders via BitrateAllocatorObserver(s).
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class BitrateAllocator {
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public:
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// Used to get notified when send stream limits such as the minimum send
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// bitrate and max padding bitrate is changed.
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class LimitObserver {
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public:
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virtual void OnAllocationLimitsChanged(
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uint32_t min_send_bitrate_bps,
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uint32_t max_padding_bitrate_bps) = 0;
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protected:
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virtual ~LimitObserver() {}
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};
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explicit BitrateAllocator(LimitObserver* limit_observer);
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// Allocate target_bitrate across the registered BitrateAllocatorObservers.
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void OnNetworkChanged(uint32_t target_bitrate_bps,
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uint8_t fraction_loss,
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int64_t rtt);
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// Set the start and max send bitrate used by the bandwidth management.
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//
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// |observer| updates bitrates if already in use.
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// |min_bitrate_bps| = 0 equals no min bitrate.
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// |max_bitrate_bps| = 0 equals no max bitrate.
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// |enforce_min_bitrate| = 'true' will allocate at least |min_bitrate_bps| for
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// this observer, even if the BWE is too low, 'false' will allocate 0 to
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// the observer if BWE doesn't allow |min_bitrate_bps|.
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// Note that |observer|->OnBitrateUpdated() will be called within the scope of
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// this method with the current rtt, fraction_loss and available bitrate and
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// that the bitrate in OnBitrateUpdated will be zero if the |observer| is
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// currently not allowed to send data.
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void AddObserver(BitrateAllocatorObserver* observer,
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uint32_t min_bitrate_bps,
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uint32_t max_bitrate_bps,
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uint32_t pad_up_bitrate_bps,
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bool enforce_min_bitrate);
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// Removes a previously added observer, but will not trigger a new bitrate
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// allocation.
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void RemoveObserver(BitrateAllocatorObserver* observer);
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// Returns initial bitrate allocated for |observer|. If |observer| is not in
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// the list of added observers, a best guess is returned.
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int GetStartBitrate(BitrateAllocatorObserver* observer);
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private:
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// Note: All bitrates for member variables and methods are in bps.
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struct ObserverConfig {
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ObserverConfig(BitrateAllocatorObserver* observer,
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uint32_t min_bitrate_bps,
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uint32_t max_bitrate_bps,
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uint32_t pad_up_bitrate_bps,
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bool enforce_min_bitrate)
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: observer(observer),
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min_bitrate_bps(min_bitrate_bps),
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max_bitrate_bps(max_bitrate_bps),
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pad_up_bitrate_bps(pad_up_bitrate_bps),
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enforce_min_bitrate(enforce_min_bitrate) {}
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BitrateAllocatorObserver* const observer;
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uint32_t min_bitrate_bps;
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uint32_t max_bitrate_bps;
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uint32_t pad_up_bitrate_bps;
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bool enforce_min_bitrate;
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};
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// Calculates the minimum requested send bitrate and max padding bitrate and
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// calls LimitObserver::OnAllocationLimitsChanged.
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void UpdateAllocationLimits();
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typedef std::list<ObserverConfig> ObserverConfigList;
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ObserverConfigList::iterator FindObserverConfig(
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const BitrateAllocatorObserver* observer)
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EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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typedef std::multimap<uint32_t, const ObserverConfig*> ObserverSortingMap;
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typedef std::map<BitrateAllocatorObserver*, int> ObserverAllocation;
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ObserverAllocation AllocateBitrates(uint32_t bitrate)
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EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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ObserverAllocation ZeroRateAllocation() EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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ObserverAllocation LowRateAllocation(uint32_t bitrate)
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EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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ObserverAllocation NormalRateAllocation(uint32_t bitrate,
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uint32_t sum_min_bitrates)
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EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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ObserverAllocation MaxRateAllocation(uint32_t bitrate,
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uint32_t sum_max_bitrates)
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EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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uint32_t LastAllocatedBitrate(const ObserverConfig& observer_config)
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EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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// The minimum bitrate required by this observer, including enable-hysteresis
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// if the observer is in a paused state.
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uint32_t MinBitrateWithHysteresis(const ObserverConfig& observer_config)
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EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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// Splits |bitrate| evenly to observers already in |allocation|.
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// |include_zero_allocations| decides if zero allocations should be part of
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// the distribution or not. The allowed max bitrate is |max_multiplier| x
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// observer max bitrate.
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void DistributeBitrateEvenly(uint32_t bitrate,
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bool include_zero_allocations,
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int max_multiplier,
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ObserverAllocation* allocation)
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EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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bool EnoughBitrateForAllObservers(uint32_t bitrate, uint32_t sum_min_bitrates)
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EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
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LimitObserver* const limit_observer_;
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rtc::CriticalSection crit_sect_;
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// Stored in a list to keep track of the insertion order.
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ObserverConfigList bitrate_observer_configs_ GUARDED_BY(crit_sect_);
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uint32_t last_bitrate_bps_ GUARDED_BY(crit_sect_);
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uint32_t last_non_zero_bitrate_bps_ GUARDED_BY(crit_sect_);
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uint8_t last_fraction_loss_ GUARDED_BY(crit_sect_);
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int64_t last_rtt_ GUARDED_BY(crit_sect_);
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ObserverAllocation last_allocation_ GUARDED_BY(crit_sect_);
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};
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} // namespace webrtc
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#endif // WEBRTC_CALL_BITRATE_ALLOCATOR_H_
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