fix audio desync for realsies, stderr to log.txt

src/resource/audio_stream.hpp

@@ -12,9 +12,15 @@ namespace anm2ed
   public:
     std::vector<float> stream{};
     SDL_AudioSpec spec{};
+    int callbackSamples{};
+    Uint64 captureStartCounter{};
+    Uint64 firstCallbackCounter{};
+    bool isFirstCallbackCaptured{};
 
     AudioStream(MIX_Mixer*);
     void capture_begin(MIX_Mixer*);
     void capture_end(MIX_Mixer*);
+    double callback_latency_seconds_get() const;
+    double capture_start_delay_seconds_get() const;
   };
-}
+}