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68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/*
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* copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef VORBIS_H
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#define VORBIS_H
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#include "avcodec.h"
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extern const float ff_vorbis_floor1_inverse_db_table[256];
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extern const float * ff_vorbis_vwin[8];
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typedef struct {
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uint_fast16_t x;
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uint_fast16_t sort;
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uint_fast16_t low;
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uint_fast16_t high;
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} floor1_entry_t;
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void ff_vorbis_ready_floor1_list(floor1_entry_t * list, int values);
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unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n); // x^(1/n)
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int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num);
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static void attribute_unused render_line(int x0, int y0, int x1, int y1, float * buf, int n) {
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int dy = y1 - y0;
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int adx = x1 - x0;
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int ady = ABS(dy);
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int base = dy / adx;
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int x = x0;
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int y = y0;
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int err = 0;
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int sy;
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if (dy < 0) sy = base - 1;
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else sy = base + 1;
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ady = ady - ABS(base) * adx;
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if (x >= n) return;
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buf[x] = ff_vorbis_floor1_inverse_db_table[y];
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for (x = x0 + 1; x < x1; x++) {
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if (x >= n) return;
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err += ady;
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if (err >= adx) {
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err -= adx;
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y += sy;
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} else {
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y += base;
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}
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buf[x] = ff_vorbis_floor1_inverse_db_table[y];
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}
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}
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#define ilog(i) av_log2(2*(i))
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#endif
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