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/*
* TwoLAME: an optimized MPEG Audio Layer Two encoder
*
* Copyright (C) 2001-2004 Michael Cheng
* Copyright (C) 2004-2006 The TwoLAME Project
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*
* $Id$
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <twolame.h>
#include "audio_wave.h"
#define MP2BUFSIZE (16384)
#define AUDIOBUFSIZE (9216)
static void usage(void)
{
printf("stwolame <input wavefile> <output mp2 file>\n");
exit(1);
}
int main(int argc, char **argv)
{
twolame_options *encodeOptions;
char *inputfilename = argv[1];
char *outputfilename = argv[2];
FILE *outfile;
short int *pcmaudio;
unsigned char *mp2buffer;
int num_samples = 0;
int mp2fill_size = 0;
int frames = 0;
wave_info_t *wave_info = NULL;
if (argc != 3)
usage();
/* Allocate some space for the PCM audio data */
if ((pcmaudio = (short *) calloc(AUDIOBUFSIZE, sizeof(short))) == NULL) {
fprintf(stderr, "pcmaudio alloc failed\n");
exit(99);
}
/* Allocate some space for the encoded MP2 audio data */
if ((mp2buffer = (unsigned char *) calloc(MP2BUFSIZE, sizeof(unsigned char))) == NULL) {
fprintf(stderr, "mp2buffer alloc failed\n");
exit(99);
}
/* grab a set of default encode options */
encodeOptions = twolame_init();
printf("Using libtwolame version %s.\n", get_twolame_version());
/* Open the wave file */
if ((wave_info = wave_init(inputfilename)) == NULL) {
fprintf(stderr, "Not a recognised WAV file.\n");
exit(99);
}
// Use sound file to over-ride preferences for
// mono/stereo and sampling-frequency
twolame_set_num_channels(encodeOptions, wave_info->channels);
if (wave_info->channels == 1) {
twolame_set_mode(encodeOptions, TWOLAME_MONO);
} else {
twolame_set_mode(encodeOptions, TWOLAME_STEREO);
}
/* Set the input and output sample rate to the same */
twolame_set_in_samplerate(encodeOptions, wave_info->samplerate);
twolame_set_out_samplerate(encodeOptions, wave_info->samplerate);
/* Set the bitrate to 192 kbps */
twolame_set_bitrate(encodeOptions, 192);
/* initialise twolame with this set of options */
if (twolame_init_params(encodeOptions) != 0) {
fprintf(stderr, "Error: configuring libtwolame encoder failed.\n");
exit(99);
}
/* Open the output file for the encoded MP2 data */
if ((outfile = fopen(outputfilename, "wb")) == 0) {
fprintf(stderr, "error opening output file %s\n", outputfilename);
exit(99);
}
// Read num_samples of audio data *per channel* from the input file
while ((num_samples = wave_get_samples(wave_info, pcmaudio, AUDIOBUFSIZE)) != 0) {
// Encode the audio!
mp2fill_size =
twolame_encode_buffer_interleaved(encodeOptions, pcmaudio, num_samples, mp2buffer,
MP2BUFSIZE);
// Write the MPEG bitstream to the file
fwrite(mp2buffer, sizeof(unsigned char), mp2fill_size, outfile);
// Display the number of MPEG audio frames we have encoded
frames += (num_samples / TWOLAME_SAMPLES_PER_FRAME);
printf("[%04i]\r", frames);
fflush(stdout);
}
/* flush any remaining audio. (don't send any new audio data) There should only ever be a max
of 1 frame on a flush. There may be zero frames if the audio data was an exact multiple of
1152 */
mp2fill_size = twolame_encode_flush(encodeOptions, mp2buffer, MP2BUFSIZE);
fwrite(mp2buffer, sizeof(unsigned char), mp2fill_size, outfile);
twolame_close(&encodeOptions);
free(pcmaudio);
printf("\nFinished nicely.\n");
return (0);
}
/* vim:ts=4:sw=4:nowrap: */
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