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libavcodec/vorbis.h

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00001 /*
00002  * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #ifndef AVCODEC_VORBIS_H
00022 #define AVCODEC_VORBIS_H
00023 
00024 #include "avcodec.h"
00025 
00026 extern const float ff_vorbis_floor1_inverse_db_table[256];
00027 extern const float * const ff_vorbis_vwin[8];
00028 extern const uint8_t ff_vorbis_channel_layout_offsets[8][8];
00029 extern const int64_t ff_vorbis_channel_layouts[9];
00030 
00031 typedef struct {
00032     uint_fast16_t x;
00033     uint_fast16_t sort;
00034     uint_fast16_t low;
00035     uint_fast16_t high;
00036 } vorbis_floor1_entry;
00037 
00038 void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values);
00039 unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n); // x^(1/n)
00040 int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num);
00041 void ff_vorbis_floor1_render_list(vorbis_floor1_entry * list, int values,
00042                                   uint_fast16_t * y_list, int * flag,
00043                                   int multiplier, float * out, int samples);
00044 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize);
00045 
00046 #define ilog(i) av_log2(2*(i))
00047 
00048 #endif /* AVCODEC_VORBIS_H */

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