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/**
* @file
* Common code for Vorbis I encoder and decoder
* @author Denes Balatoni ( dbalatoni programozo hu )
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* render_line and friend taken from ffmpeg (libavcodec/vorbis.c) */
#include "misc.h"
static inline void render_line_unrolled(int x, int y, int x1,
int sy, int ady, int adx,
const ogg_int32_t *lookup, ogg_int32_t *buf)
{
int err = -adx;
x -= x1 - 1;
buf += x1 - 1;
while (++x < 0) {
err += ady;
if (err >= 0) {
err += ady - adx;
y += sy;
buf[x] = MULT31_SHIFT15(buf[x],lookup[y]);
x++;
}
buf[x] = MULT31_SHIFT15(buf[x],lookup[y]);
}
if (x <= 0) {
if (err + ady >= 0)
y += sy;
buf[x] = MULT31_SHIFT15(buf[x],lookup[y]);
}
}
static inline void render_line(int x0, int y0, int x1, int y1,
const ogg_int32_t *lookup, ogg_int32_t *buf)
{
int dy = y1 - y0;
int adx = x1 - x0;
int ady = abs(dy);
int sy = dy < 0 ? -1 : 1;
buf[x0] = MULT31_SHIFT15(buf[x0],lookup[y0]);
if (ady*2 <= adx) { // optimized common case
render_line_unrolled(x0, y0, x1, sy, ady, adx, lookup, buf);
} else {
int base = dy / adx;
int x = x0;
int y = y0;
int err = -adx;
ady -= abs(base) * adx;
while (++x < x1) {
y += base;
err += ady;
if (err >= 0) {
err -= adx;
y += sy;
}
buf[x] = MULT31_SHIFT15(buf[x],lookup[y]);
}
}
}
#ifndef INCL_OPTIMIZED_VECTOR_FMUL_WINDOW
#define INCL_OPTIMIZED_VECTOR_FMUL_WINDOW
static inline void ff_vector_fmul_window_c(ogg_int32_t *dst, const ogg_int32_t *src0,
const ogg_int32_t *src1, const ogg_int32_t *win, int len){
int i,j;
dst += len;
win += len;
src0+= len;
for(i=-len, j=len-1; i<0; i++, j--) {
ogg_int32_t s0 = src0[i];
ogg_int32_t s1 = src1[j];
ogg_int32_t wi = win[i];
ogg_int32_t wj = win[j];
XNPROD31(s0, s1, wj, wi, &dst[i], &dst[j]);
/*
dst[i] = MULT31(s0,wj) - MULT31(s1,wi);
dst[j] = MULT31(s0,wi) + MULT31(s1,wj);
*/
}
}
#endif
static inline void copy_normalize(ogg_int32_t *dst, ogg_int32_t *src, int len)
{
memcpy(dst, src, len * sizeof(ogg_int32_t));
}
static inline void window_overlap_add(unsigned int blocksize, unsigned int lastblock,
unsigned int bs0, unsigned int bs1, int ch,
const ogg_int32_t *win, vorbis_dsp_state *v)
{
unsigned retlen = (blocksize + lastblock) / 4;
int j;
for (j = 0; j < ch; j++) {
ogg_int32_t *residue = v->residues[v->ri] + j * blocksize / 2;
ogg_int32_t *saved = v->saved_ptr[j];
ogg_int32_t *ret = v->floors + j * retlen;
ogg_int32_t *buf = residue;
if (v->W == v->lW) {
ff_vector_fmul_window_c(ret, saved, buf, win, blocksize / 4);
} else if (v->W > v->lW) {
ff_vector_fmul_window_c(ret, saved, buf, win, bs0 / 4);
copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4);
} else {
copy_normalize(ret, saved, (bs1 - bs0) / 4);
ff_vector_fmul_window_c(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
}
if (v->residues[1] == NULL) {
memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(ogg_int32_t));
v->saved_ptr[j] = v->saved + j * bs1 / 4;
} else {
v->saved_ptr[j] = buf + blocksize / 4;
}
v->pcmb[j] = ret;
}
if (v->residues[1] != NULL) {
v->ri ^= 1;
}
}
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