98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
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/*
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mpglib: test program for libmpg123, in the style of the legacy mpglib test program
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This is example code only sensible to be considered in the public domain.
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Initially written by Thomas Orgis.
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*/
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#include <mpg123.h>
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/* unistd.h is not available under MSVC,
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io.h defines the read and write functions */
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#ifndef _MSC_VER
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#include <unistd.h>
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#else
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#include <io.h>
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#endif
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#ifdef _WIN32
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#include <fcntl.h>
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#endif
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#include <stdio.h>
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#define INBUFF 16384 /**< input buffer size */
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#define OUTBUFF 32768 /**< output buffer size */
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/** The whole operation. */
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int main(int argc, char **argv)
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{
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size_t size;
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unsigned char buf[INBUFF]; /* input buffer */
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unsigned char out[OUTBUFF]; /* output buffer */
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ssize_t len;
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int ret;
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size_t in = 0, outc = 0;
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mpg123_handle *m;
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#ifdef _WIN32
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_setmode(_fileno(stdin),_O_BINARY);
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_setmode(_fileno(stdout),_O_BINARY);
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#endif
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#if MPG123_API_VERSION < 46
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// Newer versions of the library don't need that anymore, but it is safe
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// to have the no-op call present for compatibility with old versions.
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mpg123_init();
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#endif
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m = mpg123_new(argc > 1 ? argv[1] : NULL, &ret);
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if(m == NULL)
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{
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fprintf(stderr,"Unable to create mpg123 handle: %s\n", mpg123_plain_strerror(ret));
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return -1;
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}
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mpg123_param(m, MPG123_VERBOSE, 2, 0); /* Brabble a bit about the parsing/decoding. */
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/* Now mpg123 is being prepared for feeding. The main loop will read chunks from stdin and feed them to mpg123;
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then take decoded data as available to write to stdout. */
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mpg123_open_feed(m);
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if(m == NULL) return -1;
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fprintf(stderr, "Feed me some MPEG audio to stdin, I will decode to stdout.\n");
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while(1) /* Read and write until everything is through. */
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{
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len = read(0,buf,INBUFF);
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if(len <= 0)
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{
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fprintf(stderr, "input data end\n");
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break;
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}
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in += len;
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/* Feed input chunk and get first chunk of decoded audio. */
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ret = mpg123_decode(m,buf,len,out,OUTBUFF,&size);
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if(ret == MPG123_NEW_FORMAT)
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{
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long rate;
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int channels, enc;
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mpg123_getformat(m, &rate, &channels, &enc);
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fprintf(stderr, "New format: %li Hz, %i channels, encoding value %i\n", rate, channels, enc);
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}
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if(write(1,out,size) != size)
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fprintf(stderr, "Output truncated.\n");
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outc += size;
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while(ret != MPG123_ERR && ret != MPG123_NEED_MORE)
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{ /* Get all decoded audio that is available now before feeding more input. */
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ret = mpg123_decode(m,NULL,0,out,OUTBUFF,&size);
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if(write(1,out,size) != size)
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fprintf(stderr, "Output truncated.\n");
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outc += size;
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}
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if(ret == MPG123_ERR){ fprintf(stderr, "some error: %s", mpg123_strerror(m)); break; }
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}
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fprintf(stderr, "%lu bytes in, %lu bytes out\n", (unsigned long)in, (unsigned long)outc);
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/* Done decoding, now just clean up and leave. */
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mpg123_delete(m);
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return 0;
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}
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