129 lines
2.5 KiB
C
129 lines
2.5 KiB
C
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* so it's easier to fwrite */
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typedef struct
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{
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char cuehead[4];
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int chunk_size;
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int numcues;
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int cueid;
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int cuepos;
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char datahead[4];
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int chunk_start;
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int block_start;
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int sample_offset;
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} loop_t;
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/* -o enables users to specify at which point in the sample to start */
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static int sample_offset;
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void process_wav2loop(char *filename)
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{
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FILE *fWAV;
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FILE *fLOOP;
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size_t szWAV;
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char *buffer;
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loop_t loopy;
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fWAV = fopen(filename, "rb");
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if (!fWAV) {
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fprintf(stderr, "couldn't find %s\n", filename);
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return;
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}
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/* get wav file size */
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fseek(fWAV, 0L, SEEK_END);
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szWAV = (size_t)ftell(fWAV);
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fseek(fWAV, 0L, SEEK_SET);
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/* load wav into memory */
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buffer = (char *)malloc(szWAV);
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if (buffer == NULL) {
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fprintf(stderr, "error: Memory allocation failed. Exiting.\n");
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exit(0);
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}
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fread(buffer, 1, szWAV, fWAV);
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fclose(fWAV);
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/* this is LAZY, however we're not going to bother writing a full WAV loader LMAO */
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for (int i = 0; i < (szWAV - 4); i++ ) {
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if (buffer[i] == 'c')
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if (buffer[i+1] == 'u')
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if (buffer[i+2] == 'e')
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if (buffer[i+3] == ' ') {
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fprintf(stderr, "wav file %s has cue info already\n", filename);
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goto end;
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}
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}
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/* this is quite stupid, we're just appending it at the end,
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we don't even care if there already are other cue marks */
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fLOOP = fopen(filename, "w+b");
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fwrite(buffer, 1, szWAV, fLOOP);
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loopy.cuehead[0] = 'c';
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loopy.cuehead[1] = 'u';
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loopy.cuehead[2] = 'e';
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loopy.cuehead[3] = ' ';
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loopy.chunk_size = 28;
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loopy.numcues = 1;
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loopy.cueid = 0;
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loopy.cuepos = 0;
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loopy.datahead[0] = 'd';
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loopy.datahead[1] = 'a';
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loopy.datahead[2] = 't';
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loopy.datahead[3] = 'a';
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loopy.chunk_start = 0;
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loopy.block_start = 0;
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loopy.sample_offset = sample_offset;
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/* append our data to the end of the file */
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fwrite(&loopy, 1, sizeof(loop_t), fLOOP);
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fclose(fLOOP);
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/* inb4 goto considered harmful */
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end:
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free(buffer);
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}
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int main(int argc, char *argv[])
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{
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int c, ch;
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if (argc <= 1) {
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fprintf(stderr, "usage: wav2loop [-o offset] file.wav ...\n");
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return 1;
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}
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/* by default, we loop at the very start */
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sample_offset = 0;
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/* process arguments: TODO: add more? probably not */
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while ((ch = getopt(argc, argv, "o")) != -1) {
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switch (ch) {
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case 'o':
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sample_offset = atoi(argv[optind]);
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optind++;
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printf("sample offset: %i\n", sample_offset);
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break;
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default:
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return 1;
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}
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}
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argc -= optind;
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argv += optind;
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for (c = 0; c < argc; c++)
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process_wav2loop(argv[c]);
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return 0;
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}
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