blob: 2441c2baa62cc502b09910ad7b8add0afe0b8dfa
| 1 | /* |
| 2 | * TAK decoder |
| 3 | * Copyright (c) 2015 Paul B Mahol |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/attributes.h" |
| 23 | #include "takdsp.h" |
| 24 | #include "config.h" |
| 25 | |
| 26 | static void decorrelate_ls(int32_t *p1, int32_t *p2, int length) |
| 27 | { |
| 28 | int i; |
| 29 | |
| 30 | for (i = 0; i < length; i++) { |
| 31 | int32_t a = p1[i]; |
| 32 | int32_t b = p2[i]; |
| 33 | p2[i] = a + b; |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | static void decorrelate_sr(int32_t *p1, int32_t *p2, int length) |
| 38 | { |
| 39 | int i; |
| 40 | |
| 41 | for (i = 0; i < length; i++) { |
| 42 | int32_t a = p1[i]; |
| 43 | int32_t b = p2[i]; |
| 44 | p1[i] = b - a; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | static void decorrelate_sm(int32_t *p1, int32_t *p2, int length) |
| 49 | { |
| 50 | int i; |
| 51 | |
| 52 | for (i = 0; i < length; i++) { |
| 53 | int32_t a = p1[i]; |
| 54 | int32_t b = p2[i]; |
| 55 | a -= b >> 1; |
| 56 | p1[i] = a; |
| 57 | p2[i] = a + b; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int dfactor) |
| 62 | { |
| 63 | int i; |
| 64 | |
| 65 | for (i = 0; i < length; i++) { |
| 66 | int32_t a = p1[i]; |
| 67 | int32_t b = p2[i]; |
| 68 | b = dfactor * (b >> dshift) + 128 >> 8 << dshift; |
| 69 | p1[i] = b - a; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | av_cold void ff_takdsp_init(TAKDSPContext *c) |
| 74 | { |
| 75 | c->decorrelate_ls = decorrelate_ls; |
| 76 | c->decorrelate_sr = decorrelate_sr; |
| 77 | c->decorrelate_sm = decorrelate_sm; |
| 78 | c->decorrelate_sf = decorrelate_sf; |
| 79 | |
| 80 | if (ARCH_X86) |
| 81 | ff_takdsp_init_x86(c); |
| 82 | } |
| 83 |