libavcodec/vorbis.h

   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
  26 extern const float ff_vorbis_floor1_inverse_db_table[256];
  27 extern const float * const ff_vorbis_vwin[8];
  28 extern const uint8_t ff_vorbis_channel_layout_offsets[6][6];
  29 extern const int64_t ff_vorbis_channel_layouts[7];
  30
  31 typedef 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
  38 void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values);
  39 unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n); // x^(1/n)
  40 int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num);
  41 void 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);
  44
  45 #define ilog(i) av_log2(2*(i))
  46
  47 #endif /* AVCODEC_VORBIS_H */