hi,
i want to write a fundemental audio file operation library, so i tried to
seperate some functions from Sox command, such as: concatenating, mixing and
trimming. According example from source package, i write a trimming program ：
#include "sox.h"
#include <stdio.h>
#include <assert.h>
/*
* usage: trim source output start length
*/
int main(int argc, char *argv[])
{
static sox_format_t *in, *out; /* input and output files */
sox_effects_chain_t *chain;
sox_effect_t *e;
char *args[10];
assert(argc == 5);
assert(sox_init() == SOX_SUCCESS);
assert(in = sox_open_read(argv[1], NULL, NULL, NULL));
assert(out = sox_open_write(argv[2], &in->signal, &in->encoding, NULL, NULL,
NULL));
chain = sox_create_effects_chain(&in->encoding, &out->encoding);
e = sox_create_effect(sox_find_effect("trim"));
args[0] = (char*)argv[3];
args[1] = (char*)argv[4];
assert(sox_effect_options(e, 2, args) == SOX_SUCCESS);
assert(sox_add_effect(chain, e, &in->signal, &in->signal) == SOX_SUCCESS);
sox_trim_get_start(e);
sox_flow_effects(chain, NULL, NULL);
sox_delete_effects_chain(chain);
sox_close(out);
sox_close(in);
sox_quit();
return 0;
}
but it did not work. So, any suggestion will be appreciated. Thanks.
leiyonghua
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