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view decoders/libmpg123/decode.h @ 562:7e08477b0fc1

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MP3 decoder upgrade work. Ripped out SMPEG and mpglib support, replaced it with "mpg123.c" and libmpg123. libmpg123 is a much better version of mpglib, so it should solve all the problems about MP3's not seeking, or most modern MP3's not playing at all, etc. Since you no longer have to make a tradeoff with SMPEG for features, and SMPEG is basically rotting, I removed it from the project. There is still work to be done with libmpg123...there are MMX, 3DNow, SSE, Altivec, etc decoders which we don't have enabled at the moment, and the build system could use some work to make this compile more cleanly, etc. Still: huge win.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 30 Jan 2009 02:44:47 -0500
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/*
	decode.h: common definitions for decode functions

	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, taking WRITE_SAMPLE from decode.c
*/
#ifndef MPG123_DECODE_H
#define MPG123_DECODE_H

#ifdef FLOATOUT
#define WRITE_SAMPLE(samples,sum,clip) *(samples) = sum
#define sample_t float
#else
#define WRITE_SAMPLE(samples,sum,clip) \
  if( (sum) > REAL_PLUS_32767) { *(samples) = 0x7fff; (clip)++; } \
  else if( (sum) < REAL_MINUS_32768) { *(samples) = -0x8000; (clip)++; } \
  else { *(samples) = REAL_TO_SHORT(sum); }
#define sample_t short
#endif

#define NTOM_MAX 8          /* maximum allowed factor for upsampling */
#define NTOM_MAX_FREQ 96000 /* maximum frequency to upsample to / downsample from */
#define NTOM_MUL (32768)

/* synth_1to1 in optimize.h, one should also use opts for these here... */

int synth_2to1 (real *,int, mpg123_handle*, int);
int synth_2to1_8bit (real *,int, mpg123_handle *,int);
int synth_2to1_mono (real *, mpg123_handle *);
int synth_2to1_mono2stereo (real *, mpg123_handle *);
int synth_2to1_8bit_mono (real *, mpg123_handle *);
int synth_2to1_8bit_mono2stereo (real *, mpg123_handle *);

int synth_4to1 (real *,int, mpg123_handle*, int);
int synth_4to1_8bit (real *,int, mpg123_handle *,int);
int synth_4to1_mono (real *, mpg123_handle *);
int synth_4to1_mono2stereo (real *, mpg123_handle *);
int synth_4to1_8bit_mono (real *, mpg123_handle *);
int synth_4to1_8bit_mono2stereo (real *, mpg123_handle *);

int synth_ntom (real *,int, mpg123_handle*, int);
int synth_ntom_8bit (real *,int, mpg123_handle *,int);
int synth_ntom_mono (real *, mpg123_handle *);
int synth_ntom_mono2stereo (real *, mpg123_handle *);
int synth_ntom_8bit_mono (real *, mpg123_handle *);
int synth_ntom_8bit_mono2stereo (real *, mpg123_handle *);

int synth_ntom_set_step(mpg123_handle *fr); /* prepare ntom decoding */
unsigned long ntom_val(mpg123_handle *fr, off_t frame); /* compute ntom_val for frame offset */

off_t ntom_frmouts(mpg123_handle *fr, off_t frame);
off_t ntom_ins2outs(mpg123_handle *fr, off_t ins);
off_t ntom_frameoff(mpg123_handle *fr, off_t soff);

void init_layer3(void);
void init_layer3_stuff(mpg123_handle *fr);
void init_layer2(void);
void init_layer2_stuff(mpg123_handle *fr);
int make_conv16to8_table(mpg123_handle *fr);

int do_layer3(mpg123_handle *fr);
int do_layer2(mpg123_handle *fr);
int do_layer1(mpg123_handle *fr);
void do_equalizer(real *bandPtr,int channel, real equalizer[2][32]);

#endif