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/*
* copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef VORBIS_H
#define VORBIS_H
#include "avcodec.h"
extern const float ff_vorbis_floor1_inverse_db_table[256];
extern const float * ff_vorbis_vwin[8];
typedef struct {
uint_fast16_t x;
uint_fast16_t sort;
uint_fast16_t low;
uint_fast16_t high;
} floor1_entry_t;
void ff_vorbis_ready_floor1_list(floor1_entry_t * list, int values);
unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n); // x^(1/n)
int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num);
static void render_line(int x0, int y0, int x1, int y1, float * buf, int n) {
int dy = y1 - y0;
int adx = x1 - x0;
int ady = ABS(dy);
int base = dy / adx;
int x = x0;
int y = y0;
int err = 0;
int sy;
if (dy < 0) sy = base - 1;
else sy = base + 1;
ady = ady - ABS(base) * adx;
if (x >= n) return;
buf[x] = ff_vorbis_floor1_inverse_db_table[y];
for (x = x0 + 1; x < x1; x++) {
if (x >= n) return;
err += ady;
if (err >= adx) {
err -= adx;
y += sy;
} else {
y += base;
}
buf[x] = ff_vorbis_floor1_inverse_db_table[y];
}
}
#define ilog(i) av_log2(2*(i))
#endif
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