SFInputStream: fixes related to number of frames.

 - use size_t for n_frames -> support larger files
 - map SF_COUNT_MAX to unknown length
Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

src/sfinputstream.cc

@@ -68,7 +68,7 @@ SFInputStream::open (std::function<SNDFILE* (SF_INFO *)> open_func)
     }
 
   m_n_channels  = sfinfo.channels;
-  m_n_values    = sfinfo.frames * sfinfo.channels;
+  m_n_frames    = (sfinfo.frames == SF_COUNT_MAX) ? N_FRAMES_UNKNOWN : sfinfo.frames;
   m_sample_rate = sfinfo.samplerate;
 
   switch (sfinfo.format & SF_FORMAT_SUBMASK)

src/sfinputstream.hh

@@ -42,7 +42,7 @@ private:
 
   SNDFILE    *m_sndfile = nullptr;
   int         m_n_channels = 0;
-  int         m_n_values = 0;
+  size_t      m_n_frames = 0;
   int         m_bit_depth = 0;
   int         m_sample_rate = 0;
   bool        m_read_float_data = false;
@@ -74,7 +74,7 @@ public:
   size_t
   n_frames() const override
   {
-    return m_n_values / m_n_channels;
+    return m_n_frames;
   }
 };