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src/types.h: add a switch between single and double precision

--- a/src/types.h

+++ b/src/types.h

@@ -39,11 +39,21 @@

 #endif

 /** short sample format (32 or 64 bits) */

+#if AUBIO_SINGLE_PRECISION

 typedef float        smpl_t;

-//typedef double       smpl_t;

+#define AUBIO_SMPL_FMT "%f"

+#else

+typedef double       smpl_t;

+#define AUBIO_SMPL_FMT "%lf"

+#endif

 /** long sample format (64 bits or more) */

+#if AUBIO_SINGLE_PRECISION 

 typedef double       lsmp_t;

-//typedef long        lsmp_t;

+#define AUBIO_LSMP_FMT "%lf"

+#else

+typedef long double  lsmp_t;

+#define AUBIO_LSMP_FMT "%Lf"

+#endif

 /** unsigned integer */

 typedef unsigned int uint_t;

 /** signed integer */