Export sync finder quality normalization function.

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

src/syncfinder.cc

@@ -76,6 +76,7 @@ SyncFinder::init_up_down (const WavData& wav_data, Mode mode)
     }
 }
 
+/* safe to call from any thread */
 double
 SyncFinder::normalize_sync_quality (double raw_quality)
 {
@@ -89,6 +90,7 @@ SyncFinder::normalize_sync_quality (double raw_quality)
   return raw_quality / min (Params::water_delta, 0.080) / 2.9;
 }
 
+/* safe to call from any thread */
 double
 SyncFinder::bit_quality (float umag, float dmag, int bit)
 {

src/syncfinder.hh

@@ -81,7 +81,6 @@ private:
   std::vector<std::vector<FrameBit>> sync_bits;
 
   void    init_up_down (const WavData& wav_data, Mode mode);
-  double  normalize_sync_quality (double raw_quality);
   double  sync_decode (const WavData& wav_data, const size_t start_frame,
                        const std::vector<float>& fft_out_db,
                        const std::vector<char>&  have_frames,
@@ -101,6 +100,7 @@ public:
   std::vector<std::vector<FrameBit>> get_sync_bits (const WavData& wav_data, Mode mode);
 
   static double bit_quality (float umag, float dmag, int bit);
+  static double normalize_sync_quality (double raw_quality);
 private:
   void sync_fft (const WavData& wav_data,
                  size_t index,