ref: a1c3c34c70431447a89fbe08c3475dbfaee7b672
dir: /sys/src/cmd/audio/mp3enc/main.c/
/* mp3enc - encode audio files in MP3 format */
/*
* Command line frontend program
*
* Copyright (c) 1999 Mark Taylor
* 2000 Takehiro TOMIANGA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/* $Id: main.c,v 1.46 2001/03/11 11:24:25 aleidinger Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <assert.h>
#include <memory.h>
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/*
main.c is example code for how to use libmp3lame.a. To use this library,
you only need the library and lame.h. All other .h files are private
to the library.
*/
#include "lame.h"
#include "brhist.h"
#include "parse.h"
#include "main.h"
#include "get_audio.h"
#include "timestatus.h"
/*
*
* main
*
* PURPOSE: MPEG-1,2 Layer III encoder with GPSYCHO
* psychoacoustic model.
*
*/
int
parse_args_from_string(lame_global_flags *const gfp, const char *p)
{
/* Quick & very Dirty */
int c = 0, ret;
char *f, *q, *r[128];
if (p == NULL || *p == '\0')
return 0;
f = q = malloc(strlen(p) + 1);
strcpy (q, p);
r[c++] = "lhama";
for (;;) {
r[c++] = q;
while (*q != ' ' && *q != '\0')
q++;
if (*q == '\0')
break;
*q++ = '\0';
}
r[c] = NULL;
ret = parse_args(gfp, c, r);
free(f);
return ret;
}
int
main(int argc, char **argv)
{
int i, iread, imp3, ret;
short Buffer[2][1152];
unsigned char mp3buffer[LAME_MAXMP3BUFFER];
FILE *outf;
lame_global_flags *gf;
static char inPath[] = "-";
static char outPath[] = "-";
static const char *mode_names[2][4] = {
{ "stereo", "j-stereo", "dual-ch", "single-ch" },
{ "stereo", "force-ms", "dual-ch", "single-ch" }
};
/* initialize libmp3lame */
input_format = sf_unknown;
if (NULL == (gf = lame_init()) ) {
fprintf(stderr, "mp3enc: fatal error during initialization\n");
return 1;
}
/*
* parse the command line arguments, setting various flags in the
* struct 'gf'. If you want to parse your own arguments,
* or call libmp3lame from a program which uses a GUI to set arguments,
* skip this call and set the values of interest in the gf struct.
* (see the file API & lame.h for documentation about these parameters)
*/
parse_args_from_string(gf, getenv("LAMEOPT"));
ret = parse_args(gf, argc, argv);
if (ret < 0)
return ret == -2? 0: 1;
if (update_interval < 0.)
update_interval = 2.;
/*
* open the wav/aiff/raw pcm or mp3 input file. This call will
* open the file, try to parse the headers and
* set gf.samplerate, gf.num_channels, gf.num_samples.
* if you want to do your own file input, skip this call and set
* samplerate, num_channels and num_samples yourself.
*/
init_infile(gf, inPath);
if ((outf = init_outfile(outPath, lame_get_decode_only(gf))) == NULL) {
fprintf(stderr, "Can't init outfile '%s'\n", outPath);
return -42;
}
/*
* Now that all the options are set, lame needs to analyze them and
* set some more internal options and check for problems
*/
i = lame_init_params(gf);
if (i < 0) {
if (i == -1)
display_bitrates(stderr);
fprintf(stderr, "fatal error during initialization\n");
return 1;
}
if (silent || gf->VBR == vbr_off)
brhist = 0; /* turn off VBR histogram */
#ifdef BRHIST
if (brhist) {
if (brhist_init(gf, gf->VBR_min_bitrate_kbps,
gf->VBR_max_bitrate_kbps))
/* fail to initialize */
brhist = 0;
} else
brhist_init(gf, 128, 128); /* Dirty hack */
#endif
#ifdef HAVE_VORBIS
if (lame_get_ogg( gf ) ) {
lame_encode_ogg_init(gf);
gf->VBR = vbr_off; /* ignore lame's various VBR modes */
}
#endif
if (0 == lame_get_decode_only( gf ) && silent < 10 ) {
if (0)
fprintf(stderr, "Encoding as %g kHz ",
1.e-3 * lame_get_out_samplerate( gf ) );
if (lame_get_ogg(gf)) {
if (0)
fprintf(stderr, "VBR Ogg Vorbis\n" );
} else {
const char *appendix = "";
switch (gf->VBR ) {
case vbr_mt:
case vbr_rh:
case vbr_mtrh:
appendix = "ca. ";
if (0)
fprintf(stderr, "VBR(q=%i)", gf->VBR_q );
break;
case vbr_abr:
if (0)
fprintf(stderr, "average %d kbps",
gf->VBR_mean_bitrate_kbps);
break;
default:
if (0)
fprintf(stderr, "%3d Kb/s", gf->brate);
break;
}
if (0)
fprintf(stderr, " %s MPEG-%u%s Layer III (%s%gx) qval=%i\n",
mode_names[gf->force_ms][gf->mode],
2 - gf->version,
lame_get_out_samplerate(gf) < 16000?
".5": "", appendix,
0.1 * (int)(10.*gf->compression_ratio + 0.5),
lame_get_quality(gf));
}
fflush(stderr);
}
if (lame_get_decode_only(gf))
/* decode an mp3 file to a .wav */
if (mp3_delay_set)
lame_decoder(gf, outf, mp3_delay, inPath, outPath);
else
lame_decoder(gf, outf, gf->encoder_delay, inPath, outPath);
else {
/* encode until we hit eof */
do {
/* read in 'iread' samples */
iread = get_audio(gf, Buffer);
/* status display */
if (!silent)
if (update_interval > 0)
timestatus_klemm(gf);
else {
if (0 == gf->frameNum % 50) {
#ifdef BRHIST
brhist_jump_back();
#endif
timestatus(lame_get_out_samplerate(gf),
gf->frameNum,
gf->totalframes,
gf->framesize );
#ifdef BRHIST
if (brhist)
brhist_disp(gf);
#endif
}
}
/* encode */
imp3 = lame_encode_buffer(gf, Buffer[0], Buffer[1], iread,
mp3buffer, sizeof(mp3buffer));
/* was our output buffer big enough? */
if (imp3 < 0) {
if (imp3 == -1)
fprintf(stderr, "mp3 buffer is not big enough... \n");
else
fprintf(stderr, "mp3 internal error: error code=%i\n", imp3);
return 1;
}
if (fwrite(mp3buffer, 1, imp3, outf) != imp3) {
fprintf(stderr, "Error writing mp3 output \n");
return 1;
}
} while (iread);
/* may return one more mp3 frame */
imp3 = lame_encode_flush(gf, mp3buffer, sizeof(mp3buffer));
if (imp3 < 0) {
if (imp3 == -1)
fprintf(stderr, "mp3 buffer is not big enough... \n");
else
fprintf(stderr, "mp3 internal error: error code=%i\n", imp3);
return 1;
}
if (!silent) {
#ifdef BRHIST
brhist_jump_back();
#endif
timestatus(lame_get_out_samplerate(gf),
gf->frameNum,
gf->totalframes,
gf->framesize);
#ifdef BRHIST
if (brhist)
brhist_disp(gf);
brhist_disp_total(gf);
#endif
timestatus_finish();
}
fwrite(mp3buffer, 1, imp3, outf);
lame_mp3_tags_fid(gf, outf); /* add VBR tags to mp3 file */
lame_close(gf);
fclose(outf);
}
close_infile();
return 0;
}