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/*
* Copyright (c) 2024 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_NETEQ_DELAY_CONSTRAINTS_H_
#define MODULES_AUDIO_CODING_NETEQ_DELAY_CONSTRAINTS_H_
namespace webrtc {
class DelayConstraints {
public:
DelayConstraints(int max_packets_in_buffer, int base_minimum_delay_ms);
// Returns the delay (in ms) clamped to the range of valid delays.
int Clamp(int delay_ms) const;
// Notifies the DelayManager of how much audio data is carried in each packet.
bool SetPacketAudioLength(int length_ms);
// Accessors and mutators.
// Assuming `delay` is in valid range.
bool SetMinimumDelay(int delay_ms);
bool SetMaximumDelay(int delay_ms);
bool SetBaseMinimumDelay(int delay_ms);
int GetBaseMinimumDelay() const;
// These accessors are only intended for testing purposes.
int effective_minimum_delay_ms_for_test() const {
return effective_minimum_delay_ms_;
}
private:
// Provides value which minimum delay can't exceed based on current buffer
// size and given `maximum_delay_ms_`. Lower bound is a constant 0.
int MinimumDelayUpperBound() const;
// Updates `effective_minimum_delay_ms_` delay based on current
// `minimum_delay_ms_`, `base_minimum_delay_ms_`, `maximum_delay_ms_` and
// buffer size.
void UpdateEffectiveMinimumDelay();
// Makes sure that `delay_ms` is less than maximum delay, if any maximum
// is set. Also, if possible check `delay_ms` to be less than 75% of
// `max_packets_in_buffer_`.
bool IsValidMinimumDelay(int delay_ms) const;
// Checks that `delay_ms` is in the range of valid base minimum delays.
bool IsValidBaseMinimumDelay(int delay_ms) const;
// TODO(jakobi): set maximum buffer delay instead of number of packets.
const int max_packets_in_buffer_;
int base_minimum_delay_ms_;
int effective_minimum_delay_ms_; // Used as lower bound for target delay.
int minimum_delay_ms_; // Externally set minimum delay.
int maximum_delay_ms_; // Externally set maximum delay. No maximum
// delay is enforced if <= 0.
int packet_len_ms_ = 0;
};
} // namespace webrtc
#endif // MODULES_AUDIO_CODING_NETEQ_DELAY_CONSTRAINTS_H_
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