401 lines
14 KiB
C
401 lines
14 KiB
C
#pragma warning(disable:4206) // nonstandard extension used : translation unit is empty
|
|
#ifdef COMPILE_ME
|
|
/*____________________________________________________________________________
|
|
|
|
FreeAmp - The Free MP3 Player
|
|
|
|
MP3 Decoder originally Copyright (C) 1995-1997 Xing Technology
|
|
Corp. http://www.xingtech.com
|
|
|
|
Portions Copyright (C) 1998-1999 EMusic.com
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
$Id: cupini.c,v 1.3 1999/10/19 07:13:08 elrod Exp $
|
|
____________________________________________________________________________*/
|
|
|
|
/*=========================================================
|
|
initialization for cup.c - include to cup.c
|
|
mpeg audio decoder portable "c"
|
|
|
|
mod 8/6/96 add 8 bit output
|
|
|
|
mod 5/10/95 add quick (low precision) window
|
|
|
|
mod 5/16/95 sb limit for reduced samprate output
|
|
changed from 94% to 100% of Nyquist sb
|
|
|
|
mod 11/15/95 for Layer I
|
|
|
|
|
|
=========================================================*/
|
|
/*-- compiler bug, floating constant overflow w/ansi --*/
|
|
#ifdef _MSC_VER
|
|
#pragma warning(disable:4056)
|
|
#endif
|
|
|
|
|
|
|
|
|
|
static const long steps[18] =
|
|
{
|
|
0, 3, 5, 7, 9, 15, 31, 63, 127,
|
|
255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535};
|
|
|
|
|
|
/* ABCD_INDEX = lookqt[mode][sr_index][br_index] */
|
|
/* -1 = invalid */
|
|
static const signed char lookqt[4][3][16] =
|
|
{
|
|
{{1, -1, -1, -1, 2, -1, 2, 0, 0, 0, 1, 1, 1, 1, 1, -1}, /* 44ks stereo */
|
|
{0, -1, -1, -1, 2, -1, 2, 0, 0, 0, 0, 0, 0, 0, 0, -1}, /* 48ks */
|
|
{1, -1, -1, -1, 3, -1, 3, 0, 0, 0, 1, 1, 1, 1, 1, -1}}, /* 32ks */
|
|
{{1, -1, -1, -1, 2, -1, 2, 0, 0, 0, 1, 1, 1, 1, 1, -1}, /* 44ks joint stereo */
|
|
{0, -1, -1, -1, 2, -1, 2, 0, 0, 0, 0, 0, 0, 0, 0, -1}, /* 48ks */
|
|
{1, -1, -1, -1, 3, -1, 3, 0, 0, 0, 1, 1, 1, 1, 1, -1}}, /* 32ks */
|
|
{{1, -1, -1, -1, 2, -1, 2, 0, 0, 0, 1, 1, 1, 1, 1, -1}, /* 44ks dual chan */
|
|
{0, -1, -1, -1, 2, -1, 2, 0, 0, 0, 0, 0, 0, 0, 0, -1}, /* 48ks */
|
|
{1, -1, -1, -1, 3, -1, 3, 0, 0, 0, 1, 1, 1, 1, 1, -1}}, /* 32ks */
|
|
// mono extended beyond legal br index
|
|
// 1,2,2,0,0,0,1,1,1,1,1,1,1,1,1,-1, /* 44ks single chan */
|
|
// 0,2,2,0,0,0,0,0,0,0,0,0,0,0,0,-1, /* 48ks */
|
|
// 1,3,3,0,0,0,1,1,1,1,1,1,1,1,1,-1, /* 32ks */
|
|
// legal mono
|
|
{{1, 2, 2, 0, 0, 0, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1}, /* 44ks single chan */
|
|
{0, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1}, /* 48ks */
|
|
{1, 3, 3, 0, 0, 0, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1}}, /* 32ks */
|
|
};
|
|
|
|
static const long sr_table[8] =
|
|
{22050L, 24000L, 16000L, 1L,
|
|
44100L, 48000L, 32000L, 1L};
|
|
|
|
/* bit allocation table look up */
|
|
/* table per mpeg spec tables 3b2a/b/c/d /e is mpeg2 */
|
|
/* look_bat[abcd_index][4][16] */
|
|
static const unsigned char look_bat[5][4][16] =
|
|
{
|
|
/* LOOK_BATA */
|
|
{{0, 1, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17},
|
|
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17},
|
|
{0, 1, 2, 3, 4, 5, 6, 17, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 1, 2, 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
|
|
/* LOOK_BATB */
|
|
{{0, 1, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17},
|
|
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17},
|
|
{0, 1, 2, 3, 4, 5, 6, 17, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 1, 2, 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
|
|
/* LOOK_BATC */
|
|
{{0, 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 1, 2, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
|
|
/* LOOK_BATD */
|
|
{{0, 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 1, 2, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
|
|
/* LOOK_BATE */
|
|
{{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 1, 2, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 1, 2, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
|
|
};
|
|
|
|
/* look_nbat[abcd_index]][4] */
|
|
static const unsigned char look_nbat[5][4] =
|
|
{
|
|
{3, 8, 12, 4},
|
|
{3, 8, 12, 7},
|
|
{2, 0, 6, 0},
|
|
{2, 0, 10, 0},
|
|
{4, 0, 7, 19},
|
|
};
|
|
|
|
|
|
void sbt_mono(float *sample, short *pcm, int n);
|
|
void sbt_dual(float *sample, short *pcm, int n);
|
|
void sbt_dual_mono(float *sample, short *pcm, int n);
|
|
void sbt_dual_left(float *sample, short *pcm, int n);
|
|
void sbt_dual_right(float *sample, short *pcm, int n);
|
|
void sbt16_mono(float *sample, short *pcm, int n);
|
|
void sbt16_dual(float *sample, short *pcm, int n);
|
|
void sbt16_dual_mono(float *sample, short *pcm, int n);
|
|
void sbt16_dual_left(float *sample, short *pcm, int n);
|
|
void sbt16_dual_right(float *sample, short *pcm, int n);
|
|
void sbt8_mono(float *sample, short *pcm, int n);
|
|
void sbt8_dual(float *sample, short *pcm, int n);
|
|
void sbt8_dual_mono(float *sample, short *pcm, int n);
|
|
void sbt8_dual_left(float *sample, short *pcm, int n);
|
|
void sbt8_dual_right(float *sample, short *pcm, int n);
|
|
|
|
/*--- 8 bit output ---*/
|
|
void sbtB_mono(float *sample, unsigned char *pcm, int n);
|
|
void sbtB_dual(float *sample, unsigned char *pcm, int n);
|
|
void sbtB_dual_mono(float *sample, unsigned char *pcm, int n);
|
|
void sbtB_dual_left(float *sample, unsigned char *pcm, int n);
|
|
void sbtB_dual_right(float *sample, unsigned char *pcm, int n);
|
|
void sbtB16_mono(float *sample, unsigned char *pcm, int n);
|
|
void sbtB16_dual(float *sample, unsigned char *pcm, int n);
|
|
void sbtB16_dual_mono(float *sample, unsigned char *pcm, int n);
|
|
void sbtB16_dual_left(float *sample, unsigned char *pcm, int n);
|
|
void sbtB16_dual_right(float *sample, unsigned char *pcm, int n);
|
|
void sbtB8_mono(float *sample, unsigned char *pcm, int n);
|
|
void sbtB8_dual(float *sample, unsigned char *pcm, int n);
|
|
void sbtB8_dual_mono(float *sample, unsigned char *pcm, int n);
|
|
void sbtB8_dual_left(float *sample, unsigned char *pcm, int n);
|
|
void sbtB8_dual_right(float *sample, unsigned char *pcm, int n);
|
|
|
|
|
|
static const SBT_FUNCTION sbt_table[2][3][5] =
|
|
{
|
|
{{sbt_mono, sbt_dual, sbt_dual_mono, sbt_dual_left, sbt_dual_right},
|
|
{sbt16_mono, sbt16_dual, sbt16_dual_mono, sbt16_dual_left, sbt16_dual_right},
|
|
{sbt8_mono, sbt8_dual, sbt8_dual_mono, sbt8_dual_left, sbt8_dual_right}},
|
|
{{(SBT_FUNCTION) sbtB_mono,
|
|
(SBT_FUNCTION) sbtB_dual,
|
|
(SBT_FUNCTION) sbtB_dual_mono,
|
|
(SBT_FUNCTION) sbtB_dual_left,
|
|
(SBT_FUNCTION) sbtB_dual_right},
|
|
{(SBT_FUNCTION) sbtB16_mono,
|
|
(SBT_FUNCTION) sbtB16_dual,
|
|
(SBT_FUNCTION) sbtB16_dual_mono,
|
|
(SBT_FUNCTION) sbtB16_dual_left,
|
|
(SBT_FUNCTION) sbtB16_dual_right},
|
|
{(SBT_FUNCTION) sbtB8_mono,
|
|
(SBT_FUNCTION) sbtB8_dual,
|
|
(SBT_FUNCTION) sbtB8_dual_mono,
|
|
(SBT_FUNCTION) sbtB8_dual_left,
|
|
(SBT_FUNCTION) sbtB8_dual_right}},
|
|
};
|
|
|
|
static const int out_chans[5] =
|
|
{1, 2, 1, 1, 1};
|
|
|
|
|
|
int audio_decode_initL1(MPEG_HEAD * h, int framebytes_arg,
|
|
int reduction_code, int transform_code, int convert_code,
|
|
int freq_limit);
|
|
void sbt_init();
|
|
|
|
|
|
IN_OUT L1audio_decode(unsigned char *bs, signed short *pcm);
|
|
IN_OUT L2audio_decode(unsigned char *bs, signed short *pcm);
|
|
IN_OUT L3audio_decode(unsigned char *bs, unsigned char *pcm);
|
|
static const AUDIO_DECODE_ROUTINE decode_routine_table[4] =
|
|
{
|
|
L2audio_decode,
|
|
(AUDIO_DECODE_ROUTINE)L3audio_decode,
|
|
L2audio_decode,
|
|
L1audio_decode,};
|
|
|
|
/*---------------------------------------------------------*/
|
|
static void table_init()
|
|
{
|
|
int i, j;
|
|
int code;
|
|
static int iOnceOnly=0;
|
|
|
|
if (!iOnceOnly++)
|
|
{
|
|
/*-- c_values (dequant) --*/
|
|
for (i = 1; i < 18; i++)
|
|
look_c_value[i] = 2.0F / steps[i];
|
|
|
|
/*-- scale factor table, scale by 32768 for 16 pcm output --*/
|
|
for (i = 0; i < 64; i++)
|
|
sf_table[i] = (float) (32768.0 * 2.0 * pow(2.0, -i / 3.0));
|
|
|
|
/*-- grouped 3 level lookup table 5 bit token --*/
|
|
for (i = 0; i < 32; i++)
|
|
{
|
|
code = i;
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
group3_table[i][j] = (char) ((code % 3) - 1);
|
|
code /= 3;
|
|
}
|
|
}
|
|
|
|
/*-- grouped 5 level lookup table 7 bit token --*/
|
|
for (i = 0; i < 128; i++)
|
|
{
|
|
code = i;
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
group5_table[i][j] = (char) ((code % 5) - 2);
|
|
code /= 5;
|
|
}
|
|
}
|
|
|
|
/*-- grouped 9 level lookup table 10 bit token --*/
|
|
for (i = 0; i < 1024; i++)
|
|
{
|
|
code = i;
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
group9_table[i][j] = (short) ((code % 9) - 4);
|
|
code /= 9;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------*/
|
|
int L1audio_decode_init(MPEG_HEAD * h, int framebytes_arg,
|
|
int reduction_code, int transform_code, int convert_code,
|
|
int freq_limit);
|
|
int L3audio_decode_init(MPEG_HEAD * h, int framebytes_arg,
|
|
int reduction_code, int transform_code, int convert_code,
|
|
int freq_limit);
|
|
|
|
/*---------------------------------------------------------*/
|
|
/* mpeg_head defined in mhead.h frame bytes is without pad */
|
|
int audio_decode_init(MPEG_HEAD * h, int framebytes_arg,
|
|
int reduction_code, int transform_code, int convert_code,
|
|
int freq_limit)
|
|
{
|
|
int i, j, k;
|
|
static int first_pass = 1;
|
|
int abcd_index;
|
|
long samprate;
|
|
int limit;
|
|
int bit_code;
|
|
|
|
if (first_pass)
|
|
{
|
|
table_init();
|
|
first_pass = 0;
|
|
}
|
|
|
|
/* select decoder routine Layer I,II,III */
|
|
audio_decode_routine = decode_routine_table[h->option & 3];
|
|
|
|
|
|
if (h->option == 3) /* layer I */
|
|
return L1audio_decode_init(h, framebytes_arg,
|
|
reduction_code, transform_code, convert_code, freq_limit);
|
|
|
|
if (h->option == 1) /* layer III */
|
|
return L3audio_decode_init(h, framebytes_arg,
|
|
reduction_code, transform_code, convert_code, freq_limit);
|
|
|
|
|
|
|
|
transform_code = transform_code; /* not used, asm compatability */
|
|
bit_code = 0;
|
|
if (convert_code & 8)
|
|
bit_code = 1;
|
|
convert_code = convert_code & 3; /* higher bits used by dec8 freq cvt */
|
|
if (reduction_code < 0)
|
|
reduction_code = 0;
|
|
if (reduction_code > 2)
|
|
reduction_code = 2;
|
|
if (freq_limit < 1000)
|
|
freq_limit = 1000;
|
|
|
|
|
|
pMP3Stream->framebytes = framebytes_arg;
|
|
/* check if code handles */
|
|
if (h->option != 2)
|
|
return 0; /* layer II only */
|
|
if (h->sr_index == 3)
|
|
return 0; /* reserved */
|
|
|
|
/* compute abcd index for bit allo table selection */
|
|
if (h->id) /* mpeg 1 */
|
|
abcd_index = lookqt[h->mode][h->sr_index][h->br_index];
|
|
else
|
|
abcd_index = 4; /* mpeg 2 */
|
|
|
|
if (abcd_index < 0)
|
|
return 0; // fail invalid Layer II bit rate index
|
|
|
|
for (i = 0; i < 4; i++)
|
|
for (j = 0; j < 16; j++)
|
|
pMP3Stream->bat[i][j] = look_bat[abcd_index][i][j];
|
|
for (i = 0; i < 4; i++)
|
|
pMP3Stream->nbat[i] = look_nbat[abcd_index][i];
|
|
pMP3Stream->max_sb = pMP3Stream->nbat[0] + pMP3Stream->nbat[1] + pMP3Stream->nbat[2] + pMP3Stream->nbat[3];
|
|
/*----- compute pMP3Stream->nsb_limit --------*/
|
|
samprate = sr_table[4 * h->id + h->sr_index];
|
|
pMP3Stream->nsb_limit = (freq_limit * 64L + samprate / 2) / samprate;
|
|
/*- caller limit -*/
|
|
/*---- limit = 0.94*(32>>reduction_code); ----*/
|
|
limit = (32 >> reduction_code);
|
|
if (limit > 8)
|
|
limit--;
|
|
if (pMP3Stream->nsb_limit > limit)
|
|
pMP3Stream->nsb_limit = limit;
|
|
if (pMP3Stream->nsb_limit > pMP3Stream->max_sb)
|
|
pMP3Stream->nsb_limit = pMP3Stream->max_sb;
|
|
|
|
pMP3Stream->outvalues = 1152 >> reduction_code;
|
|
if (h->mode != 3)
|
|
{ /* adjust for 2 channel modes */
|
|
for (i = 0; i < 4; i++)
|
|
pMP3Stream->nbat[i] *= 2;
|
|
pMP3Stream->max_sb *= 2;
|
|
pMP3Stream->nsb_limit *= 2;
|
|
}
|
|
|
|
/* set sbt function */
|
|
k = 1 + convert_code;
|
|
if (h->mode == 3)
|
|
{
|
|
k = 0;
|
|
}
|
|
pMP3Stream->sbt = sbt_table[bit_code][reduction_code][k];
|
|
pMP3Stream->outvalues *= out_chans[k];
|
|
if (bit_code)
|
|
pMP3Stream->outbytes = pMP3Stream->outvalues;
|
|
else
|
|
pMP3Stream->outbytes = sizeof(short) * pMP3Stream->outvalues;
|
|
|
|
decinfo.channels = out_chans[k];
|
|
decinfo.outvalues = pMP3Stream->outvalues;
|
|
decinfo.samprate = samprate >> reduction_code;
|
|
if (bit_code)
|
|
decinfo.bits = 8;
|
|
else
|
|
decinfo.bits = sizeof(short) * 8;
|
|
|
|
decinfo.framebytes = pMP3Stream->framebytes;
|
|
decinfo.type = 0;
|
|
|
|
|
|
|
|
/* clear sample buffer, unused sub bands must be 0 */
|
|
for (i = 0; i < 2304*2; i++) // the *2 here was inserted by me just in case, since the array is now *2, because of stereo files unpacking at 4608 bytes per frame (which may or may not be relevant, but in any case I don't think we use the L1 versions of MP3 now anyway
|
|
sample[i] = 0.0F;
|
|
|
|
|
|
/* init sub-band transform */
|
|
sbt_init();
|
|
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------*/
|
|
void audio_decode_info(DEC_INFO * info)
|
|
{
|
|
*info = decinfo; /* info return, call after init */
|
|
}
|
|
/*---------------------------------------------------------*/
|
|
void decode_table_init()
|
|
{
|
|
/* dummy for asm version compatability */
|
|
}
|
|
/*---------------------------------------------------------*/
|
|
#endif // #ifdef COMPILE_ME
|
|
|