mirror of
https://github.com/FWGS/xash3d-fwgs
synced 2024-12-05 16:40:57 +01:00
312 lines
7.9 KiB
C
312 lines
7.9 KiB
C
/*
|
|
synth.c - compact version of famous library mpg123
|
|
Copyright (C) 2017 Uncle Mike
|
|
|
|
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 3 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.
|
|
*/
|
|
|
|
#include "mpg123.h"
|
|
#include "sample.h"
|
|
|
|
#define BACKPEDAL 0x10 // we use autoincrement and thus need this re-adjustment for window/b0.
|
|
#define BLOCK 0x40 // one decoding block is 64 samples.
|
|
|
|
#define WRITE_SHORT_SAMPLE( samples, sum, clip ) \
|
|
if(( sum ) > 32767.0f ) { *(samples) = 0x7fff; (clip)++; } \
|
|
else if(( sum ) < -32768.0f ) { *(samples) = -0x8000; (clip)++; } \
|
|
else { *(samples) = REAL_TO_SHORT( sum ); }
|
|
|
|
// main synth function, uses the plain dct64
|
|
static int synth_1to1( float *bandPtr, int channel, mpg123_handle_t *fr, int final )
|
|
{
|
|
static const int step = 2;
|
|
short *samples = (short *) (fr->buffer.data + fr->buffer.fill);
|
|
float *b0, **buf; // (*buf)[0x110];
|
|
int clip = 0;
|
|
int bo1;
|
|
|
|
if( !channel )
|
|
{
|
|
fr->bo--;
|
|
fr->bo &= 0xf;
|
|
buf = fr->float_buffs[0];
|
|
}
|
|
else
|
|
{
|
|
samples++;
|
|
buf = fr->float_buffs[1];
|
|
}
|
|
|
|
if( fr->bo & 0x1 )
|
|
{
|
|
b0 = buf[0];
|
|
bo1 = fr->bo;
|
|
dct64( buf[1] + ((fr->bo + 1) & 0xf ), buf[0] + fr->bo, bandPtr );
|
|
}
|
|
else
|
|
{
|
|
b0 = buf[1];
|
|
bo1 = fr->bo+1;
|
|
dct64( buf[0] + fr->bo, buf[1] + fr->bo + 1, bandPtr );
|
|
}
|
|
|
|
{
|
|
float *window = fr->decwin + 16 - bo1;
|
|
register int j;
|
|
|
|
for( j = (BLOCK / 4); j; j--, b0 += 0x400 / BLOCK - BACKPEDAL, window += 0x800 / BLOCK - BACKPEDAL, samples += step )
|
|
{
|
|
float sum;
|
|
|
|
sum = REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum += REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum += REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum += REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum += REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum += REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum += REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum += REAL_MUL_SYNTH( *window++, *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *window++, *b0++ );
|
|
|
|
WRITE_SHORT_SAMPLE( samples, sum, clip );
|
|
}
|
|
|
|
{
|
|
float sum;
|
|
|
|
sum = REAL_MUL_SYNTH( window[0x0], b0[0x0] );
|
|
sum += REAL_MUL_SYNTH( window[0x2], b0[0x2] );
|
|
sum += REAL_MUL_SYNTH( window[0x4], b0[0x4] );
|
|
sum += REAL_MUL_SYNTH( window[0x6], b0[0x6] );
|
|
sum += REAL_MUL_SYNTH( window[0x8], b0[0x8] );
|
|
sum += REAL_MUL_SYNTH( window[0xA], b0[0xA] );
|
|
sum += REAL_MUL_SYNTH( window[0xC], b0[0xC] );
|
|
sum += REAL_MUL_SYNTH( window[0xE], b0[0xE] );
|
|
|
|
WRITE_SHORT_SAMPLE( samples, sum, clip );
|
|
samples += step;
|
|
b0 -= 0x400 / BLOCK;
|
|
window -= 0x800 / BLOCK;
|
|
}
|
|
window += bo1<<1;
|
|
|
|
for( j= (BLOCK / 4) - 1; j; j--, b0 -= 0x400 / BLOCK + BACKPEDAL, window -= 0x800 / BLOCK - BACKPEDAL, samples += step )
|
|
{
|
|
float sum;
|
|
|
|
sum = -REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
sum -= REAL_MUL_SYNTH( *(--window), *b0++ );
|
|
|
|
WRITE_SHORT_SAMPLE( samples, sum, clip );
|
|
}
|
|
}
|
|
|
|
if( final ) fr->buffer.fill += BLOCK * sizeof( short );
|
|
|
|
return clip;
|
|
}
|
|
|
|
// the call of left and right plain synth, wrapped.
|
|
// this may be replaced by a direct stereo optimized synth.
|
|
static int synth_stereo( float *bandPtr_l, float *bandPtr_r, mpg123_handle_t *fr )
|
|
{
|
|
int clip;
|
|
|
|
clip = (fr->synth)( bandPtr_l, 0, fr, 0 );
|
|
clip += (fr->synth)( bandPtr_r, 1, fr, 1 );
|
|
return clip;
|
|
}
|
|
|
|
// mono to stereo synth, wrapping over synth_1to1
|
|
static int synth_1to1_m2s(float *bandPtr, mpg123_handle_t *fr )
|
|
{
|
|
byte *samples = fr->buffer.data;
|
|
int i, ret;
|
|
|
|
ret = synth_1to1( bandPtr, 0, fr, 1 );
|
|
samples += fr->buffer.fill - BLOCK * sizeof( short );
|
|
|
|
for( i = 0; i < (BLOCK / 2); i++ )
|
|
{
|
|
((short *)samples)[1] = ((short *)samples)[0];
|
|
samples += 2 * sizeof( short );
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
// mono synth, wrapping over synth_1to1
|
|
static int synth_1to1_mono( float *bandPtr, mpg123_handle_t *fr )
|
|
{
|
|
short samples_tmp[BLOCK];
|
|
short *tmp1 = samples_tmp;
|
|
byte *samples = fr->buffer.data;
|
|
int pnt = fr->buffer.fill;
|
|
int i, ret;
|
|
|
|
// save buffer stuff, trick samples_tmp into there, decode, restore
|
|
fr->buffer.data = (byte *)samples_tmp;
|
|
fr->buffer.fill = 0;
|
|
|
|
ret = synth_1to1( bandPtr, 0, fr, 0 ); // decode into samples_tmp
|
|
fr->buffer.data = samples; // restore original value
|
|
|
|
// now append samples from samples_tmp
|
|
samples += pnt; // just the next mem in frame buffer
|
|
|
|
for( i = 0; i < (BLOCK / 2); i++ )
|
|
{
|
|
*((short *)samples) = *tmp1;
|
|
samples += sizeof( short );
|
|
tmp1 += 2;
|
|
}
|
|
|
|
fr->buffer.fill = pnt + (BLOCK / 2) * sizeof( short );
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct synth_s synth_base =
|
|
{
|
|
{
|
|
{ synth_1to1 } // plain
|
|
},
|
|
{
|
|
{ synth_stereo } // stereo, by default only wrappers over plain synth
|
|
},
|
|
{
|
|
{ synth_1to1_m2s } // mono2stereo
|
|
},
|
|
{
|
|
{ synth_1to1_mono } // mono
|
|
}
|
|
};
|
|
|
|
void init_synth( mpg123_handle_t *fr )
|
|
{
|
|
fr->synths = synth_base;
|
|
}
|
|
|
|
static int find_synth(func_synth synth, const func_synth synths[r_limit][f_limit])
|
|
{
|
|
enum synth_resample ri;
|
|
enum synth_format fi;
|
|
|
|
for( ri = 0; ri < r_limit; ++ri )
|
|
{
|
|
for( fi = 0; fi < f_limit; ++fi )
|
|
{
|
|
if( synth == synths[ri][fi] )
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
enum optdec
|
|
{
|
|
autodec = 0,
|
|
generic,
|
|
nodec
|
|
};
|
|
|
|
// determine what kind of decoder is actually active
|
|
// this depends on runtime choices which may cause fallback to i386 or generic code.
|
|
static int find_dectype( mpg123_handle_t *fr )
|
|
{
|
|
enum optdec type = nodec;
|
|
func_synth basic_synth = fr->synth;
|
|
|
|
if( find_synth( basic_synth, synth_base.plain ))
|
|
type = generic;
|
|
|
|
if( type != nodec )
|
|
{
|
|
return MPG123_OK;
|
|
}
|
|
else
|
|
{
|
|
fr->err = MPG123_BAD_DECODER_SETUP;
|
|
return MPG123_ERR;
|
|
}
|
|
}
|
|
|
|
|
|
// set synth functions for current frame
|
|
int set_synth_functions( mpg123_handle_t *fr )
|
|
{
|
|
enum synth_resample resample = r_none;
|
|
enum synth_format basic_format = f_none; // default is always 16bit, or whatever.
|
|
|
|
if( fr->af.dec_enc & MPG123_ENC_16 )
|
|
basic_format = f_16;
|
|
|
|
// make sure the chosen format is compiled into this lib.
|
|
if( basic_format == f_none )
|
|
return -1;
|
|
|
|
// be explicit about downsampling variant.
|
|
switch( fr->down_sample )
|
|
{
|
|
case 0: resample = r_1to1; break;
|
|
}
|
|
|
|
if( resample == r_none )
|
|
return -1;
|
|
|
|
// finally selecting the synth functions for stereo / mono.
|
|
fr->synth = fr->synths.plain[resample][basic_format];
|
|
fr->synth_stereo = fr->synths.stereo[resample][basic_format];
|
|
fr->synth_mono = fr->af.channels == 2 ? fr->synths.mono2stereo[resample][basic_format] : fr->synths.mono[resample][basic_format];
|
|
|
|
if( find_dectype( fr ) != MPG123_OK )
|
|
{
|
|
fr->err = MPG123_BAD_DECODER_SETUP;
|
|
return MPG123_ERR;
|
|
}
|
|
|
|
if( frame_buffers( fr ) != 0 )
|
|
{
|
|
fr->err = MPG123_NO_BUFFERS;
|
|
return MPG123_ERR;
|
|
}
|
|
|
|
init_layer3_stuff( fr );
|
|
fr->make_decode_tables = make_decode_tables;
|
|
|
|
// we allocated the table buffers just now, so (re)create the tables.
|
|
fr->make_decode_tables( fr );
|
|
|
|
return 0;
|
|
}
|