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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
/* Split.c
* Splits a raw audio file into segments bounded by the time specified on stdin */
int main(int argc, char **argv)
{
FILE *fin = NULL;
FILE *fout = NULL;
char *in_fname = NULL;
char out_fname[] = "track-0000";
int m = 0;
int s = 0;
int frame = 0;
int index = 0;
int items = 0;
int channels = 0;
int rate = 0;
int sample_size = 0;
int i = 0;
double start = 0;
double finish = 0;
unsigned long start_sample = 0;
unsigned long finish_sample = 0;
/* FIXME Use getopt */
/* FIXME Replace assertions with useful checks+messages */
assert(argc == 5);
in_fname = argv[1];
channels = atoi(argv[2]);
rate = atoi(argv[3]);
sample_size = atoi(argv[4]);
assert(channels > 0);
assert(rate > 0);
assert(sample_size > 0);
assert(in_fname != NULL);
/* Open it up */
if ((fin = fopen(in_fname, "r")) == NULL)
{
fprintf(stderr,"Failed to open '%s': ", in_fname);
perror("fopen");
return EXIT_FAILURE;
}
printf("Opened input file '%s'\n", in_fname);
index = 0;
finish = 0; /* FIXME we assume first track starts at beginning of file */
while ( ( items = fscanf(stdin, "%d:%d:%d\n", &m, &s, &frame) ) != EOF )
{
index++;
/* Following track starts at end of last */
if (items != 3)
{
fprintf(stderr, "Timestamp #%d malformed\n", index);
break;
}
start = finish;
finish = (double)m*60 + (double)s + ((double)frame)/75;
fprintf(stderr, "Track %d starts %f s, finishes %f s\n", index, start, finish);
sprintf(out_fname, "track_%04d", index);
/* Open it up */
if ((fout = fopen(out_fname, "w")) == NULL)
{
fprintf(stderr,"Failed to open '%s': ", out_fname);
perror("fopen");
return EXIT_FAILURE;
}
start_sample = start * (double)rate * channels;
finish_sample = finish * (double)rate * channels;
/* Seek to first sample and write until last sample */
fseek(fin, start_sample*sample_size, SEEK_SET);
/* FIXME put this declaration at top */
char buffer[10240];
for (i = (int)start_sample; i < (int)finish_sample; )
{
/* FIXME unnecessary call to fwrite with items == 0 possible */
if ((items = fread(buffer, sample_size, sizeof(buffer)/sample_size, fin)))
fwrite(buffer, items, sample_size, fout);
i += items;
}
fclose(fout);
}
}
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