197 lines
6.7 KiB
C
197 lines
6.7 KiB
C
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/*
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synth.h: generic synth functions
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copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.org
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initially written by Michael Hipp, generalized by Thomas Orgis
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This header is used multiple times to create different variants of these functions.
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See decode.c and friends.
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Hint: BLOCK, MONO_NAME, MONO2STEREO_NAME, SYNTH_NAME and SAMPLE_T as well as WRITE_SAMPLE do vary.
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Thomas looked closely at the decode_1to1, decode_2to1 and decode_4to1 contents, seeing that they are too similar to be separate files.
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This is what resulted...
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Basically, you need one set of these functions for each output sample type.
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That currently means signed short, 8bit or float/double; though unsigned short may come, too.
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Define NO_AUTOINCREMENT i386 code that shall not rely on autoincrement.
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Actual benefit of this has to be examined; may apply to specific (old) compilers, only.
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*/
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/* Main synth function, uses the plain dct64 or dct64_i386. */
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int SYNTH_NAME(real *bandPtr, int channel, mpg123_handle *fr, int final)
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{
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#ifndef NO_AUTOINCREMENT
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#define BACKPEDAL 0x10 /* We use autoincrement and thus need this re-adjustment for window/b0. */
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#define MY_DCT64 dct64
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#else
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#define BACKPEDAL 0x00 /* i386 code does not need that. */
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#define MY_DCT64 dct64_i386
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#endif
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static const int step = 2;
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SAMPLE_T *samples = (SAMPLE_T *) (fr->buffer.data + fr->buffer.fill);
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real *b0, **buf; /* (*buf)[0x110]; */
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int clip = 0;
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int bo1;
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if(fr->have_eq_settings) do_equalizer(bandPtr,channel,fr->equalizer);
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if(!channel)
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{
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fr->bo--;
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fr->bo &= 0xf;
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buf = fr->real_buffs[0];
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}
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else
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{
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#ifdef USE_DITHER
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/* We always go forward 32 dither points (and back again for the second channel),
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(re)sampling the noise the same way as the original signal. */
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fr->ditherindex -= 32;
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#endif
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samples++;
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buf = fr->real_buffs[1];
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}
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#ifdef USE_DITHER
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/* We check only once for the overflow of dither index here ...
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this wraps differently than the original i586 dither code, in theory (but when DITHERSIZE % BLOCK/2 == 0 it's the same). */
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if(DITHERSIZE-fr->ditherindex < 32) fr->ditherindex = 0;
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/* And we define a macro for the dither action... */
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#define ADD_DITHER(fr,sum) sum+=fr->dithernoise[fr->ditherindex]; fr->ditherindex += 64/BLOCK;
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#else
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#define ADD_DITHER(fr,sum)
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#endif
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if(fr->bo & 0x1)
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{
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b0 = buf[0];
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bo1 = fr->bo;
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MY_DCT64(buf[1]+((fr->bo+1)&0xf),buf[0]+fr->bo,bandPtr);
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}
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else
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{
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b0 = buf[1];
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bo1 = fr->bo+1;
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MY_DCT64(buf[0]+fr->bo,buf[1]+fr->bo+1,bandPtr);
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}
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{
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register int j;
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real *window = fr->decwin + 16 - bo1;
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for(j=(BLOCK/4); j; j--, b0+=0x400/BLOCK-BACKPEDAL, window+=0x800/BLOCK-BACKPEDAL, samples+=step)
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{
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real sum;
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#ifndef NO_AUTOINCREMENT
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sum = REAL_MUL_SYNTH(*window++, *b0++);
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sum -= REAL_MUL_SYNTH(*window++, *b0++);
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sum += REAL_MUL_SYNTH(*window++, *b0++);
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sum -= REAL_MUL_SYNTH(*window++, *b0++);
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sum += REAL_MUL_SYNTH(*window++, *b0++);
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sum -= REAL_MUL_SYNTH(*window++, *b0++);
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sum += REAL_MUL_SYNTH(*window++, *b0++);
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sum -= REAL_MUL_SYNTH(*window++, *b0++);
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sum += REAL_MUL_SYNTH(*window++, *b0++);
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sum -= REAL_MUL_SYNTH(*window++, *b0++);
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sum += REAL_MUL_SYNTH(*window++, *b0++);
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sum -= REAL_MUL_SYNTH(*window++, *b0++);
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sum += REAL_MUL_SYNTH(*window++, *b0++);
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sum -= REAL_MUL_SYNTH(*window++, *b0++);
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sum += REAL_MUL_SYNTH(*window++, *b0++);
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sum -= REAL_MUL_SYNTH(*window++, *b0++);
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#else
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sum = REAL_MUL_SYNTH(window[0x0], b0[0x0]);
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sum -= REAL_MUL_SYNTH(window[0x1], b0[0x1]);
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sum += REAL_MUL_SYNTH(window[0x2], b0[0x2]);
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sum -= REAL_MUL_SYNTH(window[0x3], b0[0x3]);
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sum += REAL_MUL_SYNTH(window[0x4], b0[0x4]);
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sum -= REAL_MUL_SYNTH(window[0x5], b0[0x5]);
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sum += REAL_MUL_SYNTH(window[0x6], b0[0x6]);
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sum -= REAL_MUL_SYNTH(window[0x7], b0[0x7]);
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sum += REAL_MUL_SYNTH(window[0x8], b0[0x8]);
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sum -= REAL_MUL_SYNTH(window[0x9], b0[0x9]);
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sum += REAL_MUL_SYNTH(window[0xA], b0[0xA]);
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sum -= REAL_MUL_SYNTH(window[0xB], b0[0xB]);
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sum += REAL_MUL_SYNTH(window[0xC], b0[0xC]);
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sum -= REAL_MUL_SYNTH(window[0xD], b0[0xD]);
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sum += REAL_MUL_SYNTH(window[0xE], b0[0xE]);
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sum -= REAL_MUL_SYNTH(window[0xF], b0[0xF]);
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#endif
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ADD_DITHER(fr,sum)
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WRITE_SAMPLE(samples,sum,clip);
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}
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{
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real sum;
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sum = REAL_MUL_SYNTH(window[0x0], b0[0x0]);
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sum += REAL_MUL_SYNTH(window[0x2], b0[0x2]);
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sum += REAL_MUL_SYNTH(window[0x4], b0[0x4]);
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sum += REAL_MUL_SYNTH(window[0x6], b0[0x6]);
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sum += REAL_MUL_SYNTH(window[0x8], b0[0x8]);
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sum += REAL_MUL_SYNTH(window[0xA], b0[0xA]);
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sum += REAL_MUL_SYNTH(window[0xC], b0[0xC]);
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sum += REAL_MUL_SYNTH(window[0xE], b0[0xE]);
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ADD_DITHER(fr,sum)
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WRITE_SAMPLE(samples,sum,clip);
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samples += step;
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b0-=0x400/BLOCK;
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window-=0x800/BLOCK;
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}
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window += bo1<<1;
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for(j=(BLOCK/4)-1; j; j--, b0-=0x400/BLOCK+BACKPEDAL, window-=0x800/BLOCK-BACKPEDAL, samples+=step)
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{
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real sum;
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#ifndef NO_AUTOINCREMENT
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sum = -REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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sum -= REAL_MUL_SYNTH(*(--window), *b0++);
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#else
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sum = -REAL_MUL_SYNTH(window[-0x1], b0[0x0]);
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sum -= REAL_MUL_SYNTH(window[-0x2], b0[0x1]);
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sum -= REAL_MUL_SYNTH(window[-0x3], b0[0x2]);
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sum -= REAL_MUL_SYNTH(window[-0x4], b0[0x3]);
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sum -= REAL_MUL_SYNTH(window[-0x5], b0[0x4]);
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sum -= REAL_MUL_SYNTH(window[-0x6], b0[0x5]);
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sum -= REAL_MUL_SYNTH(window[-0x7], b0[0x6]);
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sum -= REAL_MUL_SYNTH(window[-0x8], b0[0x7]);
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sum -= REAL_MUL_SYNTH(window[-0x9], b0[0x8]);
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sum -= REAL_MUL_SYNTH(window[-0xA], b0[0x9]);
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sum -= REAL_MUL_SYNTH(window[-0xB], b0[0xA]);
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sum -= REAL_MUL_SYNTH(window[-0xC], b0[0xB]);
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sum -= REAL_MUL_SYNTH(window[-0xD], b0[0xC]);
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sum -= REAL_MUL_SYNTH(window[-0xE], b0[0xD]);
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sum -= REAL_MUL_SYNTH(window[-0xF], b0[0xE]);
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sum -= REAL_MUL_SYNTH(window[-0x0], b0[0xF]); /* Is that right? 0x0? Just wondering... */
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#endif
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ADD_DITHER(fr,sum)
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WRITE_SAMPLE(samples,sum,clip);
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}
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}
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if(final) fr->buffer.fill += BLOCK*sizeof(SAMPLE_T);
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return clip;
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#undef ADD_DITHER
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#undef BACKPEDAL
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#undef MY_DCT64
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}
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