implement final simple rate conversion during generation (#3)

bytebeat_compiler.py

@@ -64,6 +64,10 @@ if __name__ == "__main__":
 		help="bytebeat formula file")
 	parser.add_argument("-r", "--sample-rate", default=8000, type=int,
 		help="sample rate (Hz)")
+	parser.add_argument("-p", "--final-sample-rate", default=None, type=int,
+		help="convert the output to a different sample rate (usually one that "
+		"is set in the system, to improve sound quality) during generation "
+		"(not just reinterpretation)")
 	parser.add_argument("-b", "--bit-depth", default=8, type=int,
 		help="bit depth")
 	parser.add_argument("-s", "--signed", default=False, action="store_true",
@@ -88,11 +92,19 @@ if __name__ == "__main__":
 	if not args.no_return:  # Insert return statement
 		bytebeat_contents = f"\treturn\n\n{bytebeat_contents}"
 
+	final_sample_rate_code = ""
+	if not args.final_sample_rate is None:
+		sample_rate_ratio = args.sample_rate / args.final_sample_rate
+		final_sample_rate_code = f"w *= {sample_rate_ratio}L;"
+		args.sample_rate = args.final_sample_rate
+
 	substitute = read_file(PATHS["template"])
 	substitute = substitute_value("bytebeat_contents",
 		bytebeat_contents, substitute)
 	substitute = substitute_value("sample_rate",
 		args.sample_rate, substitute)
+	substitute = substitute_value("final_sample_rate_code",
+		final_sample_rate_code, substitute)
 	substitute = substitute_value("bit_depth",
 		args.bit_depth, substitute)
 	substitute = substitute_value("is_signed",

src/template.c

@@ -95,6 +95,7 @@ random(void)
 SAMPLE_TYPE
 bytebeat(long double w)
 {
+	`final_sample_rate_code`
 	uintmax_t t = (uintmax_t)w;
 
 	`bytebeat_contents`