blob: b3f52afeb6ed4ed5d5bd983424c1bc3216794bca (
plain)
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
|
/*
* Copyright (c) 2014 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 WEBRTC_MODULES_PACING_BITRATE_PROBER_H_
#define WEBRTC_MODULES_PACING_BITRATE_PROBER_H_
#include <cstddef>
#include <list>
#include "webrtc/typedefs.h"
namespace webrtc {
// Note that this class isn't thread-safe by itself and therefore relies
// on being protected by the caller.
class BitrateProber {
public:
BitrateProber();
void SetEnabled(bool enable);
// Returns true if the prober is in a probing session, i.e., it currently
// wants packets to be sent out according to the time returned by
// TimeUntilNextProbe().
bool IsProbing() const;
// Initializes a new probing session if the prober is allowed to probe.
void MaybeInitializeProbe(int bitrate_bps);
// Returns the number of milliseconds until the next packet should be sent to
// get accurate probing.
int TimeUntilNextProbe(int64_t now_ms);
// Returns the number of bytes that the prober recommends for the next probe
// packet.
size_t RecommendedPacketSize() const;
// Called to report to the prober that a packet has been sent, which helps the
// prober know when to move to the next packet in a probe.
void PacketSent(int64_t now_ms, size_t packet_size);
private:
enum ProbingState { kDisabled, kAllowedToProbe, kProbing, kWait };
ProbingState probing_state_;
// Probe bitrate per packet. These are used to compute the delta relative to
// the previous probe packet based on the size and time when that packet was
// sent.
std::list<int> probe_bitrates_;
size_t packet_size_last_send_;
int64_t time_last_send_ms_;
};
} // namespace webrtc
#endif // WEBRTC_MODULES_PACING_BITRATE_PROBER_H_
|
