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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 "webrtc/modules/interface/module.h"
#include "webrtc/modules/rtp_rtcp/interface/rtp_rtcp_defines.h"
namespace webrtc {
class BitrateObserver {
/*
* Observer class for the encoders, each encoder should implement this class
* to get the target bitrate. It also get the fraction loss and rtt to
* optimize its settings for this type of network. |target_bitrate| is the
* target media/payload bitrate excluding packet headers, measured in bits
* per second.
*/
public:
virtual void OnNetworkChanged(uint32_t target_bitrate,
uint8_t fraction_loss, // 0 - 255.
uint32_t rtt) = 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:
// The argument |enforce_min_bitrate| 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.
static BitrateController* CreateBitrateController(Clock* clock,
bool enforce_min_bitrate);
virtual ~BitrateController() {}
virtual RtcpBandwidthObserver* CreateRtcpBandwidthObserver() = 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;
/*
* Set the start and max send bitrate used by the bandwidth management.
*
* observer, updates bitrates if already in use.
* min_bitrate_kbit = 0 equals no min bitrate.
* max_bitrate_kit = 0 equals no max bitrate.
*/
virtual void SetBitrateObserver(BitrateObserver* observer,
uint32_t start_bitrate,
uint32_t min_bitrate,
uint32_t max_bitrate) = 0;
virtual void RemoveBitrateObserver(BitrateObserver* observer) = 0;
// Changes the mode that was set in the constructor.
virtual void EnforceMinBitrate(bool enforce_min_bitrate) = 0;
virtual void SetReservedBitrate(uint32_t reserved_bitrate_bps) = 0;
virtual void SetBitrateSent(uint32_t bitrate_sent_bps) = 0;
virtual void SetCodecMode(webrtc::VideoCodecMode mode) = 0;
};
} // namespace webrtc
#endif // WEBRTC_MODULES_BITRATE_CONTROLLER_INCLUDE_BITRATE_CONTROLLER_H_
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