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  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[8][8];
  29. extern const uint8_t ff_vorbis_encoding_channel_layout_offsets[8][8];
  30. extern const uint64_t ff_vorbis_channel_layouts[9];
  31.  
  32. typedef struct vorbis_floor1_entry {
  33.     uint16_t x;
  34.     uint16_t sort;
  35.     uint16_t low;
  36.     uint16_t high;
  37. } vorbis_floor1_entry;
  38.  
  39. int ff_vorbis_ready_floor1_list(AVCodecContext *avctx,
  40.                                 vorbis_floor1_entry *list, int values);
  41. unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n); // x^(1/n)
  42. int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, unsigned num);
  43. void ff_vorbis_floor1_render_list(vorbis_floor1_entry * list, int values,
  44.                                   uint16_t *y_list, int *flag,
  45.                                   int multiplier, float * out, int samples);
  46. void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize);
  47.  
  48. #define ilog(i) av_log2(2*(i))
  49.  
  50. #endif /* AVCODEC_VORBIS_H */
  51.