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/*
* Copyright (c) 2018 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 CALL_RTP_BITRATE_CONFIGURATOR_H_
#define CALL_RTP_BITRATE_CONFIGURATOR_H_
#include <optional>
#include "api/transport/bitrate_settings.h"
#include "api/units/data_rate.h"
namespace webrtc {
// RtpBitrateConfigurator calculates the bitrate configuration based on received
// remote configuration combined with local overrides.
class RtpBitrateConfigurator {
public:
explicit RtpBitrateConfigurator(const BitrateConstraints& bitrate_config);
~RtpBitrateConfigurator();
RtpBitrateConfigurator(const RtpBitrateConfigurator&) = delete;
RtpBitrateConfigurator& operator=(const RtpBitrateConfigurator&) = delete;
BitrateConstraints GetConfig() const;
// The greater min and smaller max set by this and SetClientBitratePreferences
// will be used. The latest non-negative start value from either call will be
// used. Specifying a start bitrate (>0) will reset the current bitrate
// estimate. This is due to how the 'x-google-start-bitrate' flag is currently
// implemented. Passing -1 leaves the start bitrate unchanged. Behavior is not
// guaranteed for other negative values or 0.
// The optional return value is set with new configuration if it was updated.
std::optional<BitrateConstraints> UpdateWithSdpParameters(
const BitrateConstraints& bitrate_config_);
// The greater min and smaller max set by this and SetSdpBitrateParameters
// will be used. The latest non-negative start value form either call will be
// used. Specifying a start bitrate will reset the current bitrate estimate.
// Assumes 0 <= min <= start <= max holds for set parameters.
// Update the bitrate configuration
// The optional return value is set with new configuration if it was updated.
std::optional<BitrateConstraints> UpdateWithClientPreferences(
const BitrateSettings& bitrate_mask);
// Apply a cap for relayed calls.
std::optional<BitrateConstraints> UpdateWithRelayCap(DataRate cap);
private:
// Applies update to the BitrateConstraints cached in `config_`, resetting
// with `new_start` if set.
std::optional<BitrateConstraints> UpdateConstraints(
const std::optional<int>& new_start);
// Bitrate config used until valid bitrate estimates are calculated. Also
// used to cap total bitrate used. This comes from the remote connection.
BitrateConstraints bitrate_config_;
// The config mask set by SetClientBitratePreferences.
// 0 <= min <= start <= max
BitrateSettings bitrate_config_mask_;
// The config set by SetSdpBitrateParameters.
// min >= 0, start != 0, max == -1 || max > 0
BitrateConstraints base_bitrate_config_;
// Bandwidth cap applied for relayed calls.
DataRate max_bitrate_over_relay_ = DataRate::PlusInfinity();
};
} // namespace webrtc
#endif // CALL_RTP_BITRATE_CONFIGURATOR_H_
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