1/*
2 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#ifndef AVCODEC_VORBIS_H
22#define AVCODEC_VORBIS_H
23
24#include "avcodec.h"
25
26extern const float ff_vorbis_floor1_inverse_db_table[256];
27extern const float * const ff_vorbis_vwin[8];
28extern const uint8_t ff_vorbis_channel_layout_offsets[8][8];
29extern const int64_t ff_vorbis_channel_layouts[9];
30
31typedef struct {
32    uint_fast16_t x;
33    uint_fast16_t sort;
34    uint_fast16_t low;
35    uint_fast16_t high;
36} vorbis_floor1_entry;
37
38void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values);
39unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n); // x^(1/n)
40int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num);
41void ff_vorbis_floor1_render_list(vorbis_floor1_entry * list, int values,
42                                  uint_fast16_t * y_list, int * flag,
43                                  int multiplier, float * out, int samples);
44void vorbis_inverse_coupling(float *mag, float *ang, int blocksize);
45
46#define ilog(i) av_log2(2*(i))
47
48#endif /* AVCODEC_VORBIS_H */
49