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82 lines
2.1 KiB
82 lines
2.1 KiB
/* |
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* TAK decoder |
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* Copyright (c) 2015 Paul B Mahol |
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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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#include "libavutil/attributes.h" |
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#include "takdsp.h" |
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#include "config.h" |
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static void decorrelate_ls(int32_t *p1, int32_t *p2, int length) |
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{ |
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int i; |
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for (i = 0; i < length; i++) { |
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int32_t a = p1[i]; |
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int32_t b = p2[i]; |
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p2[i] = a + b; |
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} |
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} |
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static void decorrelate_sr(int32_t *p1, int32_t *p2, int length) |
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{ |
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int i; |
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for (i = 0; i < length; i++) { |
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int32_t a = p1[i]; |
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int32_t b = p2[i]; |
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p1[i] = b - a; |
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} |
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} |
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static void decorrelate_sm(int32_t *p1, int32_t *p2, int length) |
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{ |
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int i; |
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for (i = 0; i < length; i++) { |
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int32_t a = p1[i]; |
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int32_t b = p2[i]; |
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a -= b >> 1; |
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p1[i] = a; |
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p2[i] = a + b; |
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} |
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} |
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static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int dfactor) |
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{ |
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int i; |
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for (i = 0; i < length; i++) { |
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int32_t a = p1[i]; |
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int32_t b = p2[i]; |
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b = dfactor * (b >> dshift) + 128 >> 8 << dshift; |
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p1[i] = b - a; |
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} |
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} |
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av_cold void ff_takdsp_init(TAKDSPContext *c) |
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{ |
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c->decorrelate_ls = decorrelate_ls; |
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c->decorrelate_sr = decorrelate_sr; |
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c->decorrelate_sm = decorrelate_sm; |
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c->decorrelate_sf = decorrelate_sf; |
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if (ARCH_X86) |
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ff_takdsp_init_x86(c); |
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}
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