med

commit 3964e7b3d71e98fb73b08b42866ec0cb11129a1f
parent 0cb147b077bab0dbebf27f0b340ca555a6a59e8a
Author: kocotian <kocotian@kocotian.pl>
Date:   Wed,  2 Dec 2020 13:38:36 +0100

reading wave, wave format, improved usage

Diffstat:
M
cbms
 | 
0

M
cbms.c
 | 
58
++++++++++++++++++++++++++++++++++++++++++++++++++++------
A
example_wave
 | 
0

3 files changed, 52 insertions(+), 6 deletions(-)
diff --git a/cbms b/cbms
Binary files differ.
diff --git a/cbms.c b/cbms.c
@@ -5,27 +5,73 @@
 
 #define VERSION "0.1"
 
+static size_t readf32le(char *filename, float **wave);
+static void usage(void);
+
 char *argv0;
 
-static void
-usage(void)
+static size_t
+readf32le(char *filename, float **wave)
 {
-	die("usage: %s [-v]", argv0);
+	FILE *fp = NULL; /* wave *file */
+	int ch[4]; /* temporary buffer */
+	size_t wsize = 0; /* wave size */
+
+	union {
+		float f;
+		char carr[4];
+	} fcarr; /* union that converts 4 chars from file to float */
+
+	if ((fp = fopen(filename, "r")) == NULL) {
+		die("unable to open %s:", filename);
+	} /* opening file */
+
+	*wave = malloc(0);
+
+	while ((ch[0] = fgetc(fp),
+			ch[1] = fgetc(fp),
+			ch[2] = fgetc(fp),
+			ch[3] = fgetc(fp)) != -1) {
+		fcarr.carr[0] = (int)ch[0]; fcarr.carr[1] = (int)ch[1];
+		fcarr.carr[2] = (int)ch[2]; fcarr.carr[3] = (int)ch[3];
+		*wave = realloc(*wave, sizeof(float) * ++wsize);
+		(*wave)[wsize - 1] = fcarr.f;
+	}
+
+	fclose(fp);
+
+	return wsize; /* return samples count */
 }
 
 static void
-version(void)
+usage(void)
 {
-	die("cbms-"VERSION, argv0);
+	die("usage: %s [-v] [-f waveformat] wave", argv0);
 }
 
 int
 main(int argc, char *argv[])
 {
+	char *format = "f32le"; /* by default cbms reads stream as f32le wave */
+	float *wave = NULL;
+	size_t wsize = 0;
+
 	ARGBEGIN {
 	case 'v':
-		version(); break;
+		die("cbms-"VERSION, argv0); break;
+	case 'f':
+		format = ARGF(); break;
 	default:
 		usage(); break;
 	} ARGEND
+
+	if (argc != 1)
+		usage();
+
+	if (!strcmp(format, "f32le"))
+		wsize = readf32le(argv[0], &wave);
+	else
+		die("unknown wave format [check -f parameter]");
+
+	free(wave);
 }
diff --git a/example_wave b/example_wave
Binary files differ.