/* MPGLIB replacement using mpega.library (AmigaOS)
* Written by Thomas Wenzel and Sigbjrn (CISC) Skj�et.
*
* Big thanks to St�hane Tavernard for mpega.library.
*
*/
/* $Id: amiga_mpega.c,v 1.3 2005/11/01 13:01:56 robert Exp $ */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef AMIGA_MPEGA
#define __USE_SYSBASE
#include "lame.h"
#include <stdio.h>
#include <stdlib.h>
/* We need a small workaround here so GCC doesn't fail upon redefinition. :P */
#define FLOAT _FLOAT
#include <proto/exec.h>
#include <proto/mpega.h>
#undef _FLOAT
#ifndef __GNUC__
#include <dos.h>
#endif
struct Library *MPEGABase = NULL;
MPEGA_STREAM *mstream = NULL;
MPEGA_CTRL mctrl;
static const int smpls[2][4] = {
/* Layer x I II III */
{0, 384, 1152, 1152}, /* MPEG-1 */
{0, 384, 1152, 576} /* MPEG-2(.5) */
};
#ifndef __GNUC__
static int
break_cleanup(void)
{
/* Dummy break function to make atexit() work. :P */
return 1;
}
#endif
static void
exit_cleanup(void)
{
if (mstream) {
MPEGA_close(mstream);
mstream = NULL;
}
if (MPEGABase) {
CloseLibrary(MPEGABase);
MPEGABase = NULL;
}
}
int
lame_decode_initfile(const char *fullname, mp3data_struct * mp3data)
{
mctrl.bs_access = NULL;
mctrl.layer_1_2.mono.quality = 2;
mctrl.layer_1_2.stereo.quality = 2;
mctrl.layer_1_2.mono.freq_div = 1;
mctrl.layer_1_2.stereo.freq_div = 1;
mctrl.layer_1_2.mono.freq_max = 48000;
mctrl.layer_1_2.stereo.freq_max = 48000;
mctrl.layer_3.mono.quality = 2;
mctrl.layer_3.stereo.quality = 2;
mctrl.layer_3.mono.freq_div = 1;
mctrl.layer_3.stereo.freq_div = 1;
mctrl.layer_3.mono.freq_max = 48000;
mctrl.layer_3.stereo.freq_max = 48000;
mctrl.layer_1_2.force_mono = 0;
mctrl.layer_3.force_mono = 0;
MPEGABase = OpenLibrary("mpega.library", 2);
if (!MPEGABase) {
error_printf("Unable to open mpega.library v2\n");
exit(1);
}
#ifndef __GNUC__
onbreak(break_cleanup);
#endif
atexit(exit_cleanup);
mp3data->header_parsed = 0;
mstream = MPEGA_open((char *) fullname, &mctrl);
if (!mstream)
return (-1);
mp3data->header_parsed = 1;
mp3data->stereo = mstream->dec_channels;
mp3data->samplerate = mstream->dec_frequency;
mp3data->bitrate = mstream->bitrate;
mp3data->nsamp = (float) mstream->ms_duration / 1000 * mstream->dec_frequency;
mp3data->mode = mstream->mode;
mp3data->mode_ext = 0; /* mpega.library doesn't supply this info! :( */
mp3data->framesize = smpls[mstream->norm - 1][mstream->layer];
return 0;
}
int
lame_decode_fromfile(FILE * fd, short pcm_l[], short pcm_r[], mp3data_struct * mp3data)
{
int outsize = 0;
WORD *b[MPEGA_MAX_CHANNELS];
b[0] = pcm_l;
b[1] = pcm_r;
mp3data->header_parsed = 0;
while ((outsize == 0) || (outsize == MPEGA_ERR_BADFRAME)) /* Skip bad frames */
outsize = MPEGA_decode_frame(mstream, b);
if (outsize < 0)
return (-1);
mp3data->header_parsed = 1;
mp3data->stereo = mstream->dec_channels;
mp3data->samplerate = mstream->dec_frequency;
mp3data->bitrate = mstream->bitrate;
mp3data->mode = mstream->mode;
mp3data->mode_ext = 0; /* mpega.library doesn't supply this info! :( */
mp3data->framesize = smpls[mstream->norm - 1][mstream->layer];
return outsize;
}
#endif /* AMIGA_MPEGA */