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
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/*
* 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.
*/
#ifndef MODULES_REMOTE_BITRATE_ESTIMATOR_REMOTE_ESTIMATOR_PROXY_H_
#define MODULES_REMOTE_BITRATE_ESTIMATOR_REMOTE_ESTIMATOR_PROXY_H_
#include <map>
#include <vector>
#include "api/transport/network_control.h"
#include "api/transport/webrtc_key_value_config.h"
#include "modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
#include "rtc_base/experiments/field_trial_parser.h"
#include "rtc_base/numerics/sequence_number_util.h"
#include "rtc_base/synchronization/mutex.h"
namespace webrtc {
class Clock;
class PacketRouter;
namespace rtcp {
class TransportFeedback;
}
// Class used when send-side BWE is enabled: This proxy is instantiated on the
// receive side. It buffers a number of receive timestamps and then sends
// transport feedback messages back too the send side.
class RemoteEstimatorProxy : public RemoteBitrateEstimator {
public:
RemoteEstimatorProxy(Clock* clock,
TransportFeedbackSenderInterface* feedback_sender,
const WebRtcKeyValueConfig* key_value_config,
NetworkStateEstimator* network_state_estimator);
~RemoteEstimatorProxy() override;
void IncomingPacket(int64_t arrival_time_ms,
size_t payload_size,
const RTPHeader& header) override;
void RemoveStream(uint32_t ssrc) override {}
bool LatestEstimate(std::vector<unsigned int>* ssrcs,
unsigned int* bitrate_bps) const override;
void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) override {}
void SetMinBitrate(int min_bitrate_bps) override {}
int64_t TimeUntilNextProcess() override;
void Process() override;
void OnBitrateChanged(int bitrate);
void SetSendPeriodicFeedback(bool send_periodic_feedback);
private:
struct TransportWideFeedbackConfig {
FieldTrialParameter<TimeDelta> back_window{"wind", TimeDelta::Millis(500)};
FieldTrialParameter<TimeDelta> min_interval{"min", TimeDelta::Millis(50)};
FieldTrialParameter<TimeDelta> max_interval{"max", TimeDelta::Millis(250)};
FieldTrialParameter<TimeDelta> default_interval{"def",
TimeDelta::Millis(100)};
FieldTrialParameter<double> bandwidth_fraction{"frac", 0.05};
explicit TransportWideFeedbackConfig(
const WebRtcKeyValueConfig* key_value_config) {
ParseFieldTrial({&back_window, &min_interval, &max_interval,
&default_interval, &bandwidth_fraction},
key_value_config->Lookup(
"WebRTC-Bwe-TransportWideFeedbackIntervals"));
}
};
static const int kMaxNumberOfPackets;
void SendPeriodicFeedbacks() RTC_EXCLUSIVE_LOCKS_REQUIRED(&lock_);
void SendFeedbackOnRequest(int64_t sequence_number,
const FeedbackRequest& feedback_request)
RTC_EXCLUSIVE_LOCKS_REQUIRED(&lock_);
static int64_t BuildFeedbackPacket(
uint8_t feedback_packet_count,
uint32_t media_ssrc,
int64_t base_sequence_number,
std::map<int64_t, int64_t>::const_iterator
begin_iterator, // |begin_iterator| is inclusive.
std::map<int64_t, int64_t>::const_iterator
end_iterator, // |end_iterator| is exclusive.
rtcp::TransportFeedback* feedback_packet);
Clock* const clock_;
TransportFeedbackSenderInterface* const feedback_sender_;
const TransportWideFeedbackConfig send_config_;
int64_t last_process_time_ms_;
Mutex lock_;
// |network_state_estimator_| may be null.
NetworkStateEstimator* const network_state_estimator_
RTC_PT_GUARDED_BY(&lock_);
uint32_t media_ssrc_ RTC_GUARDED_BY(&lock_);
uint8_t feedback_packet_count_ RTC_GUARDED_BY(&lock_);
SeqNumUnwrapper<uint16_t> unwrapper_ RTC_GUARDED_BY(&lock_);
absl::optional<int64_t> periodic_window_start_seq_ RTC_GUARDED_BY(&lock_);
// Map unwrapped seq -> time.
std::map<int64_t, int64_t> packet_arrival_times_ RTC_GUARDED_BY(&lock_);
int64_t send_interval_ms_ RTC_GUARDED_BY(&lock_);
bool send_periodic_feedback_ RTC_GUARDED_BY(&lock_);
// Unwraps absolute send times.
uint32_t previous_abs_send_time_ RTC_GUARDED_BY(&lock_);
Timestamp abs_send_timestamp_ RTC_GUARDED_BY(&lock_);
};
} // namespace webrtc
#endif // MODULES_REMOTE_BITRATE_ESTIMATOR_REMOTE_ESTIMATOR_PROXY_H_
|
