remote_bitrate_estimator.h revision af839b28b073be3c58a76433d7a4d96013e869f3
1/* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11// This class estimates the incoming available bandwidth. 12 13#ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_INCLUDE_REMOTE_BITRATE_ESTIMATOR_H_ 14#define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_INCLUDE_REMOTE_BITRATE_ESTIMATOR_H_ 15 16#include <map> 17#include <vector> 18 19#include "webrtc/common_types.h" 20#include "webrtc/modules/interface/module.h" 21#include "webrtc/modules/interface/module_common_types.h" 22#include "webrtc/typedefs.h" 23 24namespace webrtc { 25 26class Clock; 27 28enum RateControlType { 29 kMimdControl, 30 kAimdControl 31}; 32 33// RemoteBitrateObserver is used to signal changes in bitrate estimates for 34// the incoming streams. 35class RemoteBitrateObserver { 36 public: 37 // Called when a receive channel group has a new bitrate estimate for the 38 // incoming streams. 39 virtual void OnReceiveBitrateChanged(const std::vector<unsigned int>& ssrcs, 40 unsigned int bitrate) = 0; 41 42 virtual ~RemoteBitrateObserver() {} 43}; 44 45struct ReceiveBandwidthEstimatorStats { 46 ReceiveBandwidthEstimatorStats() : total_propagation_time_delta_ms(0) {} 47 48 // The "propagation_time_delta" of a frame is defined as (d_arrival - d_sent), 49 // where d_arrival is the delta of the arrival times of the frame and the 50 // previous frame, d_sent is the delta of the sent times of the frame and 51 // the previous frame. The sent time is calculated from the RTP timestamp. 52 53 // |total_propagation_time_delta_ms| is the sum of the propagation_time_deltas 54 // of all received frames, except that it's is adjusted to 0 when it becomes 55 // negative. 56 int total_propagation_time_delta_ms; 57 // The propagation_time_deltas for the frames arrived in the last 58 // kProcessIntervalMs using the clock passed to 59 // RemoteBitrateEstimatorFactory::Create. 60 std::vector<int> recent_propagation_time_delta_ms; 61 // The arrival times for the frames arrived in the last kProcessIntervalMs 62 // using the clock passed to RemoteBitrateEstimatorFactory::Create. 63 std::vector<int64_t> recent_arrival_time_ms; 64}; 65 66class RemoteBitrateEstimator : public CallStatsObserver, public Module { 67 public: 68 virtual ~RemoteBitrateEstimator() {} 69 70 // Called for each incoming packet. Updates the incoming payload bitrate 71 // estimate and the over-use detector. If an over-use is detected the 72 // remote bitrate estimate will be updated. Note that |payload_size| is the 73 // packet size excluding headers. 74 virtual void IncomingPacket(int64_t arrival_time_ms, 75 int payload_size, 76 const RTPHeader& header) = 0; 77 78 // Removes all data for |ssrc|. 79 virtual void RemoveStream(unsigned int ssrc) = 0; 80 81 // Returns true if a valid estimate exists and sets |bitrate_bps| to the 82 // estimated payload bitrate in bits per second. |ssrcs| is the list of ssrcs 83 // currently being received and of which the bitrate estimate is based upon. 84 virtual bool LatestEstimate(std::vector<unsigned int>* ssrcs, 85 unsigned int* bitrate_bps) const = 0; 86 87 // Returns true if the statistics are available. 88 virtual bool GetStats(ReceiveBandwidthEstimatorStats* output) const = 0; 89 90 protected: 91 static const int kProcessIntervalMs = 1000; 92 static const int kStreamTimeOutMs = 2000; 93}; 94 95struct RemoteBitrateEstimatorFactory { 96 RemoteBitrateEstimatorFactory() {} 97 virtual ~RemoteBitrateEstimatorFactory() {} 98 99 virtual RemoteBitrateEstimator* Create( 100 RemoteBitrateObserver* observer, 101 Clock* clock, 102 RateControlType control_type, 103 uint32_t min_bitrate_bps) const; 104}; 105 106struct AbsoluteSendTimeRemoteBitrateEstimatorFactory 107 : public RemoteBitrateEstimatorFactory { 108 AbsoluteSendTimeRemoteBitrateEstimatorFactory() {} 109 virtual ~AbsoluteSendTimeRemoteBitrateEstimatorFactory() {} 110 111 virtual RemoteBitrateEstimator* Create( 112 RemoteBitrateObserver* observer, 113 Clock* clock, 114 RateControlType control_type, 115 uint32_t min_bitrate_bps) const; 116}; 117} // namespace webrtc 118 119#endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_INCLUDE_REMOTE_BITRATE_ESTIMATOR_H_ 120