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http://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9 Originally committed as revision 21527 to svn://svn.ffmpeg.org/ffmpeg/trunk
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/*
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* copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_VORBIS_H
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#define AVCODEC_VORBIS_H
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#include "avcodec.h"
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extern const float ff_vorbis_floor1_inverse_db_table[256];
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extern const float * const ff_vorbis_vwin[8];
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extern const uint8_t ff_vorbis_channel_layout_offsets[8][8];
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extern const int64_t ff_vorbis_channel_layouts[9];
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typedef struct {
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uint_fast16_t x;
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uint_fast16_t sort;
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uint_fast16_t low;
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uint_fast16_t high;
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} vorbis_floor1_entry;
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void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values);
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unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n); // x^(1/n)
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int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num);
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void ff_vorbis_floor1_render_list(vorbis_floor1_entry * list, int values,
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uint_fast16_t * y_list, int * flag,
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int multiplier, float * out, int samples);
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#define ilog(i) av_log2(2*(i))
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#endif /* AVCODEC_VORBIS_H */
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