Sorry for confuse. I try to develop some library based on libsox, something
like:
Trim(char*sourcefile,char*destfile,int start,int length)
All files are audio file.
雷永华 18057190009
在 2012-10-22，下午7:49，Jan Stary <h...@stare.cz> 写道：
> On Oct 22 16:02:29, corey....@yahoo.com.cn wrote:
>> hi,
>> i want to write a fundemental audio file operation library,
>> so i tried to seperate some functions from Sox command,
>
> So, you are writing an audio processing library
> using another audio processing library, namely libsox?
> Why would you do that, instead of using libsox directly?
>
>> 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.
>
>
> If it "didn't work", it is probably "broken". Sigh.
>
>> So, any suggestion will be appreciated. Thanks.
>
> man libsox
>
>
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