Add wav2loop, which just makes sure a WAV file loops from the beginning.

wav2loop.c

@@ -0,0 +1,156 @@
+/*
+ * Copyright (c) 2014-2021 Marco Hladik <marco@icculus.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* open a .wav file, add a loop point for idTech
+   this exists solely because nobody makes this easy
+   and convenient or hell even automated.
+   don't ask me what's wrong with the software dev
+   community but not even Audacity of all things can
+   do something as miniscule as adding cue points
+   to a .WAV file in the first quarter of the 21st century
+   people actually submitted patches but those went ignored.
+   why bother contributing when you have to do everything
+   yourself anyway ~eukara
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* so it's easier to fwrite */
+typedef struct
+{
+	char cuehead[4];
+	int chunk_size;
+	int numcues;
+	int cueid;
+	int cuepos;
+
+	char datahead[4];
+	int chunk_start;
+	int block_start;
+	int sample_offset;
+} loop_t;
+
+/* -o enables users to specify at which point in the sample to start */
+static int sample_offset;
+
+void process_wav2loop(char *filename)
+{
+	FILE *fWAV;
+	FILE *fLOOP;
+	size_t szWAV;
+	char *buffer;
+	loop_t loopy;
+
+	fWAV = fopen(filename, "rb");
+
+	if (!fWAV) {
+		fprintf(stderr, "couldn't find %s\n", filename);
+		return;
+	}
+
+	/* get wav file size */
+	fseek(fWAV, 0L, SEEK_END);
+	szWAV = (size_t)ftell(fWAV);
+	fseek(fWAV, 0L, SEEK_SET);
+
+	/* load wav into memory */
+	buffer = (char *)malloc(szWAV);
+
+	if (buffer == NULL) {
+		fprintf(stderr, "error: Memory allocation failed. Exiting.\n");
+		exit(0);
+	}
+
+	fread(buffer, 1, szWAV, fWAV);
+	fclose(fWAV);
+
+	/* this is LAZY, however we're not going to bother writing a full WAV loader LMAO */
+	for (int i = 0; i < (szWAV - 4); i++ ) {
+		if (buffer[i] == 'c')
+		if (buffer[i+1] == 'u')
+		if (buffer[i+2] == 'e')
+		if (buffer[i+3] == ' ') {
+			fprintf(stderr, "wav file %s has cue info already\n", filename);
+			goto end;
+		}
+	}
+
+	/* this is quite stupid, we're just appending it at the end,
+	   we don't even care if there already are other cue marks */	
+	fLOOP = fopen(filename, "w+b");
+	fwrite(buffer, 1, szWAV, fLOOP);
+	
+	loopy.cuehead[0] = 'c';
+	loopy.cuehead[1] = 'u';
+	loopy.cuehead[2] = 'e';
+	loopy.cuehead[3] = ' ';
+	loopy.chunk_size = 28;
+	loopy.numcues = 1;
+	loopy.cueid = 0;
+	loopy.cuepos = 0;
+	loopy.datahead[0] = 'd';
+	loopy.datahead[1] = 'a';
+	loopy.datahead[2] = 't';
+	loopy.datahead[3] = 'a';
+	loopy.chunk_start = 0;
+	loopy.block_start = 0;
+	loopy.sample_offset = sample_offset;
+
+	/* append our data to the end of the file */
+	fwrite(&loopy, 1, sizeof(loop_t), fLOOP);
+	fclose(fLOOP);
+
+	/* inb4 goto considered harmful */
+end:
+	free(buffer);
+}
+
+int main(int argc, char *argv[])
+{
+	int c, ch;
+
+	if (argc <= 1) {
+		fprintf(stderr, "usage: wav2loop [-o offset] file.wav ...\n");
+		return 1;
+	}
+
+	/* by default, we loop at the very start */
+	sample_offset = 0;
+
+	/* process arguments: TODO: add more? probably not */
+	while ((ch = getopt(argc, argv, "o")) != -1) {
+		switch (ch) {
+		case 'o':
+			sample_offset = atoi(argv[optind]);
+			optind++;
+			printf("sample offset: %i\n", sample_offset);
+			break;
+		default:
+			return 1;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	for (c = 0; c < argc; c++)
+		process_wav2loop(argv[c]);
+
+	return 0;
+}