+std::string region_name_from_path (std::string path, bool strip_channels, bool add_channel_suffix = false, uint32_t total = 0, uint32_t this_one = 0);
+bool path_is_paired (std::string path, std::string& pair_base);
+
+void compute_equal_power_fades (ARDOUR::nframes_t nframes, float* in, float* out);
+
+const char* sync_source_to_string (ARDOUR::SyncSource src);
+ARDOUR::SyncSource string_to_sync_source (std::string str);
+
+const char* edit_mode_to_string (ARDOUR::EditMode);
+ARDOUR::EditMode string_to_edit_mode (std::string);
+
+
+static inline double
+gain_to_slider_position (ARDOUR::gain_t g)
+{
+ if (g == 0) return 0;
+ return pow((6.0*log(g)/log(2.0)+192.0)/198.0, 8.0);
+
+}
+
+static inline ARDOUR::gain_t
+slider_position_to_gain (double pos)
+{
+ /* XXX Marcus writes: this doesn't seem right to me. but i don't have a better answer ... */
+ if (pos == 0.0) return 0;
+ return pow (2.0,(sqrt(sqrt(sqrt(pos)))*198.0-192.0)/6.0);
+}
+
+/* I don't really like hard-coding these falloff rates here
+ * Probably should use a map of some kind that could be configured
+ * These rates are db/sec.
+*/
+
+#define METER_FALLOFF_OFF 0.0f
+#define METER_FALLOFF_SLOWEST 6.6f // BBC standard
+#define METER_FALLOFF_SLOW 8.6f // BBC standard
+#define METER_FALLOFF_MEDIUM 20.0f
+#define METER_FALLOFF_FAST 32.0f
+#define METER_FALLOFF_FASTER 46.0f
+#define METER_FALLOFF_FASTEST 70.0f
+
+float meter_falloff_to_float (ARDOUR::MeterFalloff);
+ARDOUR::MeterFalloff meter_falloff_from_float (float);
+float meter_falloff_to_db_per_sec (float);
+
+const char* native_header_format_extension (ARDOUR::HeaderFormat, const ARDOUR::DataType& type);
+bool matching_unsuffixed_filename_exists_in (const std::string& dir, const std::string& name);
+
+#if defined(HAVE_COREAUDIO) || defined(HAVE_AUDIOUNITS)
+std::string CFStringRefToStdString(CFStringRef stringRef);
+#endif // HAVE_COREAUDIO