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// This file is part of the 64k demo project.
// It implements a test backend that simulates jittered audio consumption.
// Useful for stress-testing ring buffer under realistic timing conditions.
#pragma once
#if !defined(STRIP_ALL)
#include "audio_backend.h"
#include <atomic>
#include <thread>
// Simulates a real audio device with timing jitter and variable chunk sizes
class JitteredAudioBackend : public AudioBackend {
public:
JitteredAudioBackend();
~JitteredAudioBackend() override;
void init() override;
void start() override;
void shutdown() override;
// Control simulation
void set_jitter_amount(float jitter_ms); // Random jitter in ms (default: 5ms)
void set_base_interval(float interval_ms); // Base interval between reads (default: 10ms)
void set_chunk_size_range(int min_frames, int max_frames); // Variable chunk sizes
// Query state
int get_total_frames_consumed() const { return total_frames_consumed_.load(); }
int get_underrun_count() const { return underrun_count_.load(); }
bool is_running() const { return running_.load(); }
private:
void audio_thread_loop();
std::thread audio_thread_;
std::atomic<bool> running_;
std::atomic<bool> should_stop_;
// Configuration
float jitter_ms_;
float base_interval_ms_;
int min_chunk_frames_;
int max_chunk_frames_;
// Statistics
std::atomic<int> total_frames_consumed_;
std::atomic<int> underrun_count_; // How many times buffer was empty
};
#endif /* !defined(STRIP_ALL) */
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