fix (and comment) on subtle bug with audio file data width function

libs/ardour/ardour/sndfile_helpers.h

@@ -49,7 +49,6 @@ int sndfile_header_format_by_index (int);
 int sndfile_endian_format_by_index (int);
 
 int sndfile_data_width (int format);
-int sndfile_data_width (ARDOUR::SampleFormat);
 
 // It'd be nice if libsndfile did this for us
 std::string sndfile_major_format (int);

libs/ardour/ardour/types.h

@@ -456,6 +456,8 @@ namespace ARDOUR {
 		FormatInt16
 	};
 
+	int format_data_width (ARDOUR::SampleFormat);
+
 	enum CDMarkerFormat {
 		CDMarkerNone,
 		CDMarkerCUE,

libs/ardour/globals.cc

@@ -609,3 +609,26 @@ ARDOUR::get_microseconds ()
 	return (microseconds_t) ts.tv_sec * 1000000 + (ts.tv_nsec/1000);
 #endif
 }
+
+/** Return the number of bits per sample for a given sample format.
+ *
+ * This is closely related to sndfile_data_width() but does NOT
+ * return a "magic" value to differentiate between 32 bit integer
+ * and 32 bit floating point values.
+ */
+
+int
+format_data_width (ARDOUR::SampleFormat format)
+{
+
+
+
+	switch (format) {
+	case ARDOUR::FormatInt16:
+		return 16;
+	case ARDOUR::FormatInt24:
+		return 24;
+	default:
+		return 32;
+	}
+}

libs/ardour/sndfile_helpers.cc

@@ -133,26 +133,13 @@ sndfile_data_width (int format)
 	case SF_FORMAT_PCM_32:
 		return 32;
 	case SF_FORMAT_FLOAT:
-		return 32;
+		return 1; /* ridiculous but used as a magic value */
 	default:
 		// we don't handle anything else within ardour
 		return 0;
 	}
 }
 
-int
-sndfile_data_width (ARDOUR::SampleFormat format)
-{
-	switch (format) {
-	case ARDOUR::FormatInt16:
-		return sndfile_data_width (SF_FORMAT_PCM_16);
-	case ARDOUR::FormatInt24:
-		return sndfile_data_width (SF_FORMAT_PCM_24);
-	default:
-		return sndfile_data_width (SF_FORMAT_FLOAT);
-	}
-}
-
 string
 sndfile_major_format(int format)
 {