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/*
* Copyright (c) 2016 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 MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_FRAME_LENGTH_CONTROLLER_H_
#define MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_FRAME_LENGTH_CONTROLLER_H_
#include <stddef.h>
#include <map>
#include <set>
#include "absl/types/optional.h"
#include "modules/audio_coding/audio_network_adaptor/controller.h"
#include "modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor_config.h"
namespace webrtc {
// Determines target frame length based on the network metrics and the decision
// of FEC controller.
class FrameLengthController final : public Controller {
public:
struct Config {
struct FrameLengthChange {
FrameLengthChange(int from_frame_length_ms, int to_frame_length_ms);
bool operator<(const FrameLengthChange& rhs) const;
int from_frame_length_ms;
int to_frame_length_ms;
};
Config(const std::set<int>& encoder_frame_lengths_ms,
int initial_frame_length_ms,
int min_encoder_bitrate_bps,
float fl_increasing_packet_loss_fraction,
float fl_decreasing_packet_loss_fraction,
int fl_increase_overhead_offset,
int fl_decrease_overhead_offset,
std::map<FrameLengthChange, int> fl_changing_bandwidths_bps);
Config(const Config& other);
~Config();
std::set<int> encoder_frame_lengths_ms;
int initial_frame_length_ms;
int min_encoder_bitrate_bps;
// Uplink packet loss fraction below which frame length can increase.
float fl_increasing_packet_loss_fraction;
// Uplink packet loss fraction below which frame length should decrease.
float fl_decreasing_packet_loss_fraction;
// Offset to apply to overhead calculation when increasing frame length.
int fl_increase_overhead_offset;
// Offset to apply to overhead calculation when decreasing frame length.
int fl_decrease_overhead_offset;
std::map<FrameLengthChange, int> fl_changing_bandwidths_bps;
};
explicit FrameLengthController(const Config& config);
~FrameLengthController() override;
FrameLengthController(const FrameLengthController&) = delete;
FrameLengthController& operator=(const FrameLengthController&) = delete;
void UpdateNetworkMetrics(const NetworkMetrics& network_metrics) override;
void MakeDecision(AudioEncoderRuntimeConfig* config) override;
private:
bool FrameLengthIncreasingDecision(const AudioEncoderRuntimeConfig& config);
bool FrameLengthDecreasingDecision(const AudioEncoderRuntimeConfig& config);
const Config config_;
std::set<int>::const_iterator frame_length_ms_;
absl::optional<int> uplink_bandwidth_bps_;
absl::optional<float> uplink_packet_loss_fraction_;
absl::optional<size_t> overhead_bytes_per_packet_;
// True if the previous frame length decision was an increase, otherwise
// false.
bool prev_decision_increase_ = false;
};
} // namespace webrtc
#endif // MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_FRAME_LENGTH_CONTROLLER_H_
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