Convert default resampler from libresample to libsoxr.

lib-src/libsoxr/src/internal.h

@@ -0,0 +1,41 @@
+/* SoX Resampler Library      Copyright (c) 2007-12 robs@users.sourceforge.net
+ * Licence for this file: LGPL v2.1                  See LICENCE for details. */
+
+#if !defined soxr_internal_included
+#define soxr_internal_included
+
+#include "soxr-config.h"
+
+#undef min
+#undef max
+#define min(a, b) ((a) <= (b) ? (a) : (b))
+#define max(a, b) ((a) >= (b) ? (a) : (b))
+
+#define range_limit(x, lower, upper) (min(max(x, lower), upper))
+#define linear_to_dB(x) (log10(x) * 20)
+#define array_length(a) (sizeof(a)/sizeof(a[0]))
+#define sqr(a) ((a) * (a))
+
+#if defined NDEBUG
+  #ifdef __GNUC__
+    void lsx_dummy(char const *, ...);
+  #else
+    static __inline void lsx_dummy(char const * x, ...) {}
+  #endif
+  #define lsx_debug if(0) lsx_dummy
+#else
+  #include <stdarg.h>
+  #include <stdio.h>
+  #ifdef __GNUC__
+    __attribute__ ((unused))
+  #endif
+  static void lsx_debug(char const * fmt, ...)
+  {
+    va_list args;
+    va_start(args, fmt);
+    vfprintf(stderr, fmt, args);
+    fputc('\n', stderr);
+    va_end(args);
+  }
+#endif
+#endif