class NetEqSimulator { public: virtual ~NetEqSimulator() = default;
enum class Action { kNormal, kExpand, kAccelerate, kPreemptiveExpand };
// The results of one simulation step. struct SimulationStepResult {
SimulationStepResult();
SimulationStepResult(const SimulationStepResult& other);
~SimulationStepResult();
bool is_simulation_finished = false; // The amount of audio produced (in ms) with the actions in this time step.
std::map<Action, int> action_times_ms; // The amount of wall clock time (in ms) that elapsed since the previous // event. This is not necessarily equal to the sum of the values in // action_times_ms.
int64_t simulation_step_ms = 0;
};
struct NetEqState {
NetEqState();
NetEqState(const NetEqState& other);
~NetEqState(); // The sum of the packet buffer and sync buffer delay.
int current_delay_ms = 0; // An indicator that packet loss occurred since the last GetAudio event. bool packet_loss_occurred = false; // An indicator that the packet buffer has been flushed since the last // GetAudio event. bool packet_buffer_flushed = false; // Indicates if the next needed packet is available in the buffer. bool next_packet_available = false; // The inter-arrival times in ms of the packets that have arrived since the // last GetAudio event.
std::vector<int> packet_iat_ms; // The current packet size in ms.
int packet_size_ms = 0;
};
// Runs the simulation until the end. Returns the duration of the produced // audio in ms. virtual int64_t Run() = 0; // Runs the simulation until we hit the next GetAudio event. If the simulation // is finished, is_simulation_finished will be set to true in the returned // SimulationStepResult. virtual SimulationStepResult RunToNextGetAudio() = 0;
// Set the next action to be taken by NetEq. This will override any action // that NetEq would normally decide to take. virtualvoid SetNextAction(Action next_operation) = 0;
// Get the current state of NetEq. virtual NetEqState GetNetEqState() = 0;
// Get the underlying NetEq instance. virtual NetEq* GetNetEq() = 0;
};
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