add CLI argument -l / --samples, adjust logic

bytebeat_compiler.py: add argument `-l` / `--samples` and additional logic

src/template.c:
1. Transform parameter `SECONDS` into `LENGTH`; change `PRODUCT` formula
   respectively
2. Show count of samples in non-silent mode

bytebeat_compiler.py

@@ -74,8 +74,12 @@ if __name__ == "__main__":
 		help="is signed?")
 	parser.add_argument("-c", "--channels", default=1, type=int,
 		help="amount of channels")
-	parser.add_argument("-t", "--seconds", default=30, type=int,
+	parser.add_argument("-t", "--seconds", default=None, type=int,
-		help="length (seconds)")
+		help="length in seconds (samples = sample rate * seconds) : "
+			 "default = 30 seconds")
+	parser.add_argument("-l", "--samples", default=None, type=int,
+		help="length in samples (adds to `-t`; supports negative numbers) : "
+			 "default = +0 samples")
 	parser.add_argument("-a", "--no-return", default=False, action="store_true",
 		help="do not insert return statement before the code")
 	parser.add_argument("-q", "--silent", default=False, action="store_true",
@@ -102,6 +106,35 @@ if __name__ == "__main__":
 		final_sample_rate_code = f"w *= {sample_rate_ratio}L;"
 		args.sample_rate = args.final_sample_rate
 
+	samples = 0
+	while True:
+		no_seconds = args.seconds is None or args.seconds == 0
+		no_samples = args.samples is None or args.samples == 0
+		seconds_exist = not no_seconds
+		samples_exist = not no_samples
+
+		if seconds_exist and args.seconds < 0:
+			print("CLI: Count of seconds can't be less than zero.")
+			raise SystemExit
+
+		if no_seconds and samples_exist:
+			samples = args.samples
+		elif seconds_exist and samples_exist:
+			samples = args.seconds * args.sample_rate + args.samples
+		elif seconds_exist and no_samples:
+			samples = args.seconds * args.sample_rate
+		elif no_seconds and no_samples:
+			args.seconds = 30  # default
+			continue
+		else:
+			print("CLI: Incorrect seconds/samples length format.")
+			raise SystemExit
+		break
+
+	if samples <= 0:
+		print("CLI: Count of samples should be greater than zero.")
+		raise SystemExit
+
 	substitute = read_file(PATHS["template"])
 	substitute = substitute_var("bytebeat_contents",
 		bytebeat_contents, substitute)
@@ -115,8 +148,8 @@ if __name__ == "__main__":
 		"1" if args.signed else "0", substitute)
 	substitute = substitute_var("channels",
 		args.channels, substitute)
-	substitute = substitute_var("seconds",
+	substitute = substitute_var("length",
-		args.seconds, substitute)
+		samples, substitute)
 	substitute = substitute_var("silent_mode",
 		"true" if args.silent else "false", substitute)
 	substitute = substitute_var("verbose_mode",

src/template.c

@@ -21,7 +21,7 @@ const char* ANSI_CLEAR = __ANSI_CLEAR_STRING;
 #define BIT_DEPTH `bit_depth`
 #define IS_SIGNED `is_signed`
 #define CHANNELS `channels`
-#define SECONDS `seconds`
+#define LENGTH `length`
 
 #if BIT_DEPTH <= 8
 # define SAMPLE_TYPE uint8_t
@@ -33,7 +33,7 @@ const char* ANSI_CLEAR = __ANSI_CLEAR_STRING;
 # endif
 #endif
 
-#define PRODUCT (SAMPLE_RATE * SECONDS * CHANNELS)
+#define PRODUCT (LENGTH * CHANNELS)
 #define FREQUENCY_OF_STATUS_REPORTING 5000
 
 #define BIT_DEPTH_LIMITER     ((1 << BIT_DEPTH) - 1)
@@ -75,6 +75,9 @@ main(void)
 #endif
 
 #if !SILENT_MODE
+	const uintmax_t seconds = LENGTH / SAMPLE_RATE,
+		samples = LENGTH % SAMPLE_RATE;
+
 	printf(
 	  "\n"
 	  "Sample rate: %d Hz\n"
@@ -87,16 +90,24 @@ main(void)
 	  IS_SIGNED ? "" : "un",
 	  BIT_DEPTH);
 
-	if (SECONDS >= 3600)
+	if (seconds > 0) {
+		if (seconds >= 3600)
 			printf(
-		  "%d:%02d:%02d",
+			  "%" PRIuMAX ":%02" PRIuMAX ":%02" PRIuMAX,
-		  SECONDS / 3600,
+			  seconds / 3600,
-		  (SECONDS / 60) % 60,
+			  (seconds / 60) % 60,
-		  SECONDS % 60);
+			  seconds % 60);
-	else if (SECONDS >= 60)
+		else if (seconds >= 60)
-		printf("%d:%02d", SECONDS / 60, SECONDS % 60);
+			printf("%" PRIuMAX ":%02" PRIuMAX, seconds / 60, seconds % 60);
 		else
-		printf("%d seconds", SECONDS);
+			printf("%" PRIuMAX " seconds", seconds);
+	}
+
+	if (seconds > 0 && samples > 0)
+		printf(" + ");
+
+	if (samples > 0)
+		printf("%" PRIuMAX " samples", samples);
 
 	printf(
 #if VERBOSE_MODE