src/audio/mock_audio_backend.h


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// This file is part of the 64k demo project.
// It implements a test-only mock audio backend for event recording.
// Used for tracker timing verification and audio synchronization tests.

#pragma once

#if !defined(STRIP_ALL)

#include "audio_backend.h"
#include <vector>

// Event structure for recorded voice triggers
struct VoiceTriggerEvent {
  float timestamp_sec;
  int spectrogram_id;
  float volume;
  float pan;
};

// Mock audio backend that records all voice trigger events
// Used for testing tracker timing and synchronization
class MockAudioBackend : public AudioBackend {
 public:
  MockAudioBackend();
  ~MockAudioBackend() override;

  // AudioBackend interface (no-ops for mock)
  void init() override;
  void start() override;
  void shutdown() override;

  // Event recording hooks
  void on_voice_triggered(float timestamp, int spectrogram_id, float volume,
                          float pan) override;
  void on_frames_rendered(int num_frames) override;

  // Test interface methods
  const std::vector<VoiceTriggerEvent>& get_events() const {
    return recorded_events_;
  }
  void clear_events() {
    recorded_events_.clear();
  }

  // Manual time control for deterministic testing
  void advance_time(float delta_sec) {
    current_time_sec_ += delta_sec;
  }
  void set_time(float time_sec) {
    current_time_sec_ = time_sec;
  }
  float get_current_time() const {
    return current_time_sec_;
  }

  // Sample rate used for frame-to-time conversion
  static const int kSampleRate = 32000;

 private:
  std::vector<VoiceTriggerEvent> recorded_events_;
  float current_time_sec_;
};

#endif /* !defined(STRIP_ALL) */