mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-24 07:36:48 +03:00
197 lines
6.7 KiB
C
197 lines
6.7 KiB
C
/*
|
|
synth.h: generic synth functions
|
|
|
|
copyright 1995-2008 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 Michael Hipp, generalized by Thomas Orgis
|
|
|
|
This header is used multiple times to create different variants of these functions.
|
|
See decode.c and friends.
|
|
Hint: BLOCK, MONO_NAME, MONO2STEREO_NAME, SYNTH_NAME and SAMPLE_T as well as WRITE_SAMPLE do vary.
|
|
|
|
Thomas looked closely at the decode_1to1, decode_2to1 and decode_4to1 contents, seeing that they are too similar to be separate files.
|
|
This is what resulted...
|
|
|
|
Basically, you need one set of these functions for each output sample type.
|
|
That currently means signed short, 8bit or float/double; though unsigned short may come, too.
|
|
|
|
Define NO_AUTOINCREMENT i386 code that shall not rely on autoincrement.
|
|
Actual benefit of this has to be examined; may apply to specific (old) compilers, only.
|
|
*/
|
|
|
|
|
|
/* Main synth function, uses the plain dct64 or dct64_i386. */
|
|
int SYNTH_NAME(real *bandPtr, int channel, mpg123_handle *fr, int final)
|
|
{
|
|
#ifndef NO_AUTOINCREMENT
|
|
#define BACKPEDAL 0x10 /* We use autoincrement and thus need this re-adjustment for window/b0. */
|
|
#define MY_DCT64 dct64
|
|
#else
|
|
#define BACKPEDAL 0x00 /* i386 code does not need that. */
|
|
#define MY_DCT64 dct64_i386
|
|
#endif
|
|
static const int step = 2;
|
|
SAMPLE_T *samples = (SAMPLE_T *) (fr->buffer.data + fr->buffer.fill);
|
|
|
|
real *b0, **buf; /* (*buf)[0x110]; */
|
|
int clip = 0;
|
|
int bo1;
|
|
|
|
if(fr->have_eq_settings) do_equalizer(bandPtr,channel,fr->equalizer);
|
|
|
|
if(!channel)
|
|
{
|
|
fr->bo--;
|
|
fr->bo &= 0xf;
|
|
buf = fr->real_buffs[0];
|
|
}
|
|
else
|
|
{
|
|
#ifdef USE_DITHER
|
|
/* We always go forward 32 dither points (and back again for the second channel),
|
|
(re)sampling the noise the same way as the original signal. */
|
|
fr->ditherindex -= 32;
|
|
#endif
|
|
samples++;
|
|
buf = fr->real_buffs[1];
|
|
}
|
|
#ifdef USE_DITHER
|
|
/* We check only once for the overflow of dither index here ...
|
|
this wraps differently than the original i586 dither code, in theory (but when DITHERSIZE % BLOCK/2 == 0 it's the same). */
|
|
if(DITHERSIZE-fr->ditherindex < 32) fr->ditherindex = 0;
|
|
/* And we define a macro for the dither action... */
|
|
#define ADD_DITHER(fr,sum) sum+=fr->dithernoise[fr->ditherindex]; fr->ditherindex += 64/BLOCK;
|
|
#else
|
|
#define ADD_DITHER(fr,sum)
|
|
#endif
|
|
|
|
if(fr->bo & 0x1)
|
|
{
|
|
b0 = buf[0];
|
|
bo1 = fr->bo;
|
|
MY_DCT64(buf[1]+((fr->bo+1)&0xf),buf[0]+fr->bo,bandPtr);
|
|
}
|
|
else
|
|
{
|
|
b0 = buf[1];
|
|
bo1 = fr->bo+1;
|
|
MY_DCT64(buf[0]+fr->bo,buf[1]+fr->bo+1,bandPtr);
|
|
}
|
|
|
|
{
|
|
register int j;
|
|
real *window = fr->decwin + 16 - bo1;
|
|
|
|
for(j=(BLOCK/4); j; j--, b0+=0x400/BLOCK-BACKPEDAL, window+=0x800/BLOCK-BACKPEDAL, samples+=step)
|
|
{
|
|
real sum;
|
|
#ifndef NO_AUTOINCREMENT
|
|
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++);
|
|
#else
|
|
sum = REAL_MUL_SYNTH(window[0x0], b0[0x0]);
|
|
sum -= REAL_MUL_SYNTH(window[0x1], b0[0x1]);
|
|
sum += REAL_MUL_SYNTH(window[0x2], b0[0x2]);
|
|
sum -= REAL_MUL_SYNTH(window[0x3], b0[0x3]);
|
|
sum += REAL_MUL_SYNTH(window[0x4], b0[0x4]);
|
|
sum -= REAL_MUL_SYNTH(window[0x5], b0[0x5]);
|
|
sum += REAL_MUL_SYNTH(window[0x6], b0[0x6]);
|
|
sum -= REAL_MUL_SYNTH(window[0x7], b0[0x7]);
|
|
sum += REAL_MUL_SYNTH(window[0x8], b0[0x8]);
|
|
sum -= REAL_MUL_SYNTH(window[0x9], b0[0x9]);
|
|
sum += REAL_MUL_SYNTH(window[0xA], b0[0xA]);
|
|
sum -= REAL_MUL_SYNTH(window[0xB], b0[0xB]);
|
|
sum += REAL_MUL_SYNTH(window[0xC], b0[0xC]);
|
|
sum -= REAL_MUL_SYNTH(window[0xD], b0[0xD]);
|
|
sum += REAL_MUL_SYNTH(window[0xE], b0[0xE]);
|
|
sum -= REAL_MUL_SYNTH(window[0xF], b0[0xF]);
|
|
#endif
|
|
|
|
ADD_DITHER(fr,sum)
|
|
WRITE_SAMPLE(samples,sum,clip);
|
|
}
|
|
|
|
{
|
|
real 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]);
|
|
|
|
ADD_DITHER(fr,sum)
|
|
WRITE_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)
|
|
{
|
|
real sum;
|
|
#ifndef NO_AUTOINCREMENT
|
|
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++);
|
|
#else
|
|
sum = -REAL_MUL_SYNTH(window[-0x1], b0[0x0]);
|
|
sum -= REAL_MUL_SYNTH(window[-0x2], b0[0x1]);
|
|
sum -= REAL_MUL_SYNTH(window[-0x3], b0[0x2]);
|
|
sum -= REAL_MUL_SYNTH(window[-0x4], b0[0x3]);
|
|
sum -= REAL_MUL_SYNTH(window[-0x5], b0[0x4]);
|
|
sum -= REAL_MUL_SYNTH(window[-0x6], b0[0x5]);
|
|
sum -= REAL_MUL_SYNTH(window[-0x7], b0[0x6]);
|
|
sum -= REAL_MUL_SYNTH(window[-0x8], b0[0x7]);
|
|
sum -= REAL_MUL_SYNTH(window[-0x9], b0[0x8]);
|
|
sum -= REAL_MUL_SYNTH(window[-0xA], b0[0x9]);
|
|
sum -= REAL_MUL_SYNTH(window[-0xB], b0[0xA]);
|
|
sum -= REAL_MUL_SYNTH(window[-0xC], b0[0xB]);
|
|
sum -= REAL_MUL_SYNTH(window[-0xD], b0[0xC]);
|
|
sum -= REAL_MUL_SYNTH(window[-0xE], b0[0xD]);
|
|
sum -= REAL_MUL_SYNTH(window[-0xF], b0[0xE]);
|
|
sum -= REAL_MUL_SYNTH(window[-0x0], b0[0xF]); /* Is that right? 0x0? Just wondering... */
|
|
#endif
|
|
ADD_DITHER(fr,sum)
|
|
WRITE_SAMPLE(samples,sum,clip);
|
|
}
|
|
}
|
|
|
|
if(final) fr->buffer.fill += BLOCK*sizeof(SAMPLE_T);
|
|
|
|
return clip;
|
|
#undef ADD_DITHER
|
|
#undef BACKPEDAL
|
|
#undef MY_DCT64
|
|
}
|