linx-simulator2/node_modules/lame/deps/mpg123/doc/examples/mpglib.c
2019-09-18 11:11:16 +03:00

93 lines
2.5 KiB
C

/*
mpglib: test program for libmpg123, in the style of the legacy mpglib test program
copyright 2007 by the mpg123 project - free software under the terms of the LGPL 2.1
see COPYING and AUTHORS files in distribution or http://mpg123.org
initially written by Thomas Orgis
*/
#include <mpg123.h>
/* unistd.h is not available under MSVC,
io.h defines the read and write functions */
#ifndef _MSC_VER
#include <unistd.h>
#else
#include <io.h>
#endif
#ifdef _WIN32
#include <fcntl.h>
#endif
#include <stdio.h>
#define INBUFF 16384
#define OUTBUFF 32768
int main(int argc, char **argv)
{
size_t size;
unsigned char buf[INBUFF]; /* input buffer */
unsigned char out[OUTBUFF]; /* output buffer */
ssize_t len;
int ret;
size_t in = 0, outc = 0;
mpg123_handle *m;
#ifdef _WIN32
_setmode(_fileno(stdin),_O_BINARY);
_setmode(_fileno(stdout),_O_BINARY);
#endif
mpg123_init();
m = mpg123_new(argc > 1 ? argv[1] : NULL, &ret);
if(m == NULL)
{
fprintf(stderr,"Unable to create mpg123 handle: %s\n", mpg123_plain_strerror(ret));
return -1;
}
mpg123_param(m, MPG123_VERBOSE, 2, 0); /* Brabble a bit about the parsing/decoding. */
/* Now mpg123 is being prepared for feeding. The main loop will read chunks from stdin and feed them to mpg123;
then take decoded data as available to write to stdout. */
mpg123_open_feed(m);
if(m == NULL) return -1;
fprintf(stderr, "Feed me some MPEG audio to stdin, I will decode to stdout.\n");
while(1) /* Read and write until everything is through. */
{
len = read(0,buf,INBUFF);
if(len <= 0)
{
fprintf(stderr, "input data end\n");
break;
}
in += len;
/* Feed input chunk and get first chunk of decoded audio. */
ret = mpg123_decode(m,buf,len,out,OUTBUFF,&size);
if(ret == MPG123_NEW_FORMAT)
{
long rate;
int channels, enc;
mpg123_getformat(m, &rate, &channels, &enc);
fprintf(stderr, "New format: %li Hz, %i channels, encoding value %i\n", rate, channels, enc);
}
write(1,out,size);
outc += size;
while(ret != MPG123_ERR && ret != MPG123_NEED_MORE)
{ /* Get all decoded audio that is available now before feeding more input. */
ret = mpg123_decode(m,NULL,0,out,OUTBUFF,&size);
write(1,out,size);
outc += size;
}
if(ret == MPG123_ERR){ fprintf(stderr, "some error: %s", mpg123_strerror(m)); break; }
}
fprintf(stderr, "%lu bytes in, %lu bytes out\n", (unsigned long)in, (unsigned long)outc);
/* Done decoding, now just clean up and leave. */
mpg123_delete(m);
mpg123_exit();
return 0;
}