Libav
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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 */