1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/*
* Copyright (c) 2015 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.
*
* Usage: this class will register multiple RtcpBitrateObserver's one at each
* RTCP module. It will aggregate the results and run one bandwidth estimation
* and push the result to the encoders via BitrateObserver(s).
*/
#ifndef WEBRTC_CALL_BITRATE_ALLOCATOR_H_
#define WEBRTC_CALL_BITRATE_ALLOCATOR_H_
#include <list>
#include <map>
#include <utility>
#include "webrtc/base/scoped_ptr.h"
#include "webrtc/base/thread_annotations.h"
#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
namespace webrtc {
class BitrateObserver;
class BitrateAllocator {
public:
BitrateAllocator();
// Allocate target_bitrate across the registered BitrateObservers.
// Returns actual bitrate allocated (might be higher than target_bitrate if
// for instance EnforceMinBitrate() is enabled.
uint32_t OnNetworkChanged(uint32_t target_bitrate,
uint8_t fraction_loss,
int64_t rtt);
// Set the start and max send bitrate used by the bandwidth management.
//
// |observer| updates bitrates if already in use.
// |min_bitrate_bps| = 0 equals no min bitrate.
// |max_bitrate_bps| = 0 equals no max bitrate.
// Returns bitrate allocated for the bitrate observer.
int AddBitrateObserver(BitrateObserver* observer,
uint32_t min_bitrate_bps,
uint32_t max_bitrate_bps);
void RemoveBitrateObserver(BitrateObserver* observer);
void GetMinMaxBitrateSumBps(int* min_bitrate_sum_bps,
int* max_bitrate_sum_bps) const;
// This method controls the behavior when the available bitrate is lower than
// the minimum bitrate, or the sum of minimum bitrates.
// When true, the bitrate will never be set lower than the minimum bitrate(s).
// When false, the bitrate observers will be allocated rates up to their
// respective minimum bitrate, satisfying one observer after the other.
void EnforceMinBitrate(bool enforce_min_bitrate);
private:
struct BitrateConfiguration {
BitrateConfiguration(uint32_t min_bitrate, uint32_t max_bitrate)
: min_bitrate(min_bitrate), max_bitrate(max_bitrate) {}
uint32_t min_bitrate;
uint32_t max_bitrate;
};
struct ObserverConfiguration {
ObserverConfiguration(BitrateObserver* observer, uint32_t bitrate)
: observer(observer), min_bitrate(bitrate) {}
BitrateObserver* const observer;
uint32_t min_bitrate;
};
typedef std::pair<BitrateObserver*, BitrateConfiguration>
BitrateObserverConfiguration;
typedef std::list<BitrateObserverConfiguration> BitrateObserverConfList;
typedef std::multimap<uint32_t, ObserverConfiguration> ObserverSortingMap;
typedef std::map<BitrateObserver*, int> ObserverBitrateMap;
BitrateObserverConfList::iterator FindObserverConfigurationPair(
const BitrateObserver* observer) EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
ObserverBitrateMap AllocateBitrates() EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
ObserverBitrateMap NormalRateAllocation(uint32_t bitrate,
uint32_t sum_min_bitrates)
EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
ObserverBitrateMap LowRateAllocation(uint32_t bitrate)
EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
rtc::scoped_ptr<CriticalSectionWrapper> crit_sect_;
// Stored in a list to keep track of the insertion order.
BitrateObserverConfList bitrate_observers_ GUARDED_BY(crit_sect_);
bool bitrate_observers_modified_ GUARDED_BY(crit_sect_);
bool enforce_min_bitrate_ GUARDED_BY(crit_sect_);
uint32_t last_bitrate_bps_ GUARDED_BY(crit_sect_);
uint8_t last_fraction_loss_ GUARDED_BY(crit_sect_);
int64_t last_rtt_ GUARDED_BY(crit_sect_);
};
} // namespace webrtc
#endif // WEBRTC_CALL_BITRATE_ALLOCATOR_H_
|
