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65 lines
2.0 KiB
65 lines
2.0 KiB
/* |
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* copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org> |
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* |
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* This library 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 of the License, or (at your option) any later version. |
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* |
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* This library 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 this library; 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 VORBIS_H |
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#define VORBIS_H |
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extern const float ff_vorbis_floor1_inverse_db_table[256]; |
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extern const float * ff_vorbis_vwin[8]; |
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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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} floor1_entry_t; |
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void ff_vorbis_ready_floor1_list(floor1_entry_t * 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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static void render_line(int x0, int y0, int x1, int y1, float * buf, int n) { |
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int dy = y1 - y0; |
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int adx = x1 - x0; |
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int ady = ABS(dy); |
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int base = dy / adx; |
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int x = x0; |
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int y = y0; |
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int err = 0; |
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int sy; |
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if (dy < 0) sy = base - 1; |
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else sy = base + 1; |
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ady = ady - ABS(base) * adx; |
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if (x >= n) return; |
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buf[x] = ff_vorbis_floor1_inverse_db_table[y]; |
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for (x = x0 + 1; x < x1; x++) { |
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if (x >= n) return; |
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err += ady; |
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if (err >= adx) { |
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err -= adx; |
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y += sy; |
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} else { |
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y += base; |
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} |
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buf[x] = ff_vorbis_floor1_inverse_db_table[y]; |
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} |
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} |
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#define ilog(i) av_log2(2*(i)) |
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#endif
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