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/*
* Copyright (c) 2012 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_MODULES_BITRATE_CONTROLLER_INCLUDE_BITRATE_CONTROLLER_H_
#define WEBRTC_MODULES_BITRATE_CONTROLLER_INCLUDE_BITRATE_CONTROLLER_H_
#include <map>
#include "webrtc/modules/include/module.h"
#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
namespace webrtc {
class CriticalSectionWrapper;
class RtcEventLog;
struct PacketInfo;
class BitrateObserver {
// Observer class for bitrate changes announced due to change in bandwidth
// estimate or due to bitrate allocation changes. Fraction loss and rtt is
// also part of this callback to allow the obsevrer to optimize its settings
// for different types of network environments. The bitrate does not include
// packet headers and is measured in bits per second.
public:
virtual void OnNetworkChanged(uint32_t bitrate_bps,
uint8_t fraction_loss, // 0 - 255.
int64_t rtt_ms) = 0;
virtual ~BitrateObserver() {}
};
class BitrateController : public Module {
// This class collects feedback from all streams sent to a peer (via
// RTCPBandwidthObservers). It does one aggregated send side bandwidth
// estimation and divide the available bitrate between all its registered
// BitrateObservers.
public:
static const int kDefaultStartBitrateKbps = 300;
static BitrateController* CreateBitrateController(Clock* clock,
BitrateObserver* observer);
virtual ~BitrateController() {}
virtual RtcpBandwidthObserver* CreateRtcpBandwidthObserver() = 0;
virtual void SetStartBitrate(int start_bitrate_bps) = 0;
virtual void SetMinMaxBitrate(int min_bitrate_bps, int max_bitrate_bps) = 0;
virtual void SetEventLog(RtcEventLog* event_log) = 0;
// Gets the available payload bandwidth in bits per second. Note that
// this bandwidth excludes packet headers.
virtual bool AvailableBandwidth(uint32_t* bandwidth) const = 0;
virtual void SetReservedBitrate(uint32_t reserved_bitrate_bps) = 0;
};
} // namespace webrtc
#endif // WEBRTC_MODULES_BITRATE_CONTROLLER_INCLUDE_BITRATE_CONTROLLER_H_
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