blob: b5b96e612966d93fdd4ebad11f901a31e70383c3
| 1 | /* |
| 2 | * Lossless video DSP utils |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | #include "avcodec.h" |
| 21 | #include "lossless_videodsp.h" |
| 22 | #include "libavcodec/mathops.h" |
| 23 | |
| 24 | // 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size |
| 25 | #define pb_7f (~0UL / 255 * 0x7f) |
| 26 | #define pb_80 (~0UL / 255 * 0x80) |
| 27 | |
| 28 | static void add_bytes_c(uint8_t *dst, uint8_t *src, ptrdiff_t w) |
| 29 | { |
| 30 | long i; |
| 31 | |
| 32 | for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) { |
| 33 | long a = *(long *) (src + i); |
| 34 | long b = *(long *) (dst + i); |
| 35 | *(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80); |
| 36 | } |
| 37 | for (; i < w; i++) |
| 38 | dst[i + 0] += src[i + 0]; |
| 39 | } |
| 40 | |
| 41 | static void add_median_pred_c(uint8_t *dst, const uint8_t *src1, |
| 42 | const uint8_t *diff, ptrdiff_t w, |
| 43 | int *left, int *left_top) |
| 44 | { |
| 45 | int i; |
| 46 | uint8_t l, lt; |
| 47 | |
| 48 | l = *left; |
| 49 | lt = *left_top; |
| 50 | |
| 51 | for (i = 0; i < w; i++) { |
| 52 | l = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i]; |
| 53 | lt = src1[i]; |
| 54 | dst[i] = l; |
| 55 | } |
| 56 | |
| 57 | *left = l; |
| 58 | *left_top = lt; |
| 59 | } |
| 60 | |
| 61 | static int add_left_pred_c(uint8_t *dst, const uint8_t *src, ptrdiff_t w, |
| 62 | int acc) |
| 63 | { |
| 64 | int i; |
| 65 | |
| 66 | for (i = 0; i < w - 1; i++) { |
| 67 | acc += src[i]; |
| 68 | dst[i] = acc; |
| 69 | i++; |
| 70 | acc += src[i]; |
| 71 | dst[i] = acc; |
| 72 | } |
| 73 | |
| 74 | for (; i < w; i++) { |
| 75 | acc += src[i]; |
| 76 | dst[i] = acc; |
| 77 | } |
| 78 | |
| 79 | return acc; |
| 80 | } |
| 81 | |
| 82 | static int add_left_pred_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, ptrdiff_t w, unsigned acc){ |
| 83 | int i; |
| 84 | |
| 85 | for(i=0; i<w-1; i++){ |
| 86 | acc+= src[i]; |
| 87 | dst[i]= acc &= mask; |
| 88 | i++; |
| 89 | acc+= src[i]; |
| 90 | dst[i]= acc &= mask; |
| 91 | } |
| 92 | |
| 93 | for(; i<w; i++){ |
| 94 | acc+= src[i]; |
| 95 | dst[i]= acc &= mask; |
| 96 | } |
| 97 | |
| 98 | return acc; |
| 99 | } |
| 100 | |
| 101 | |
| 102 | void ff_llviddsp_init(LLVidDSPContext *c) |
| 103 | { |
| 104 | c->add_bytes = add_bytes_c; |
| 105 | c->add_median_pred = add_median_pred_c; |
| 106 | c->add_left_pred = add_left_pred_c; |
| 107 | |
| 108 | c->add_left_pred_int16 = add_left_pred_int16_c; |
| 109 | |
| 110 | if (ARCH_PPC) |
| 111 | ff_llviddsp_init_ppc(c); |
| 112 | if (ARCH_X86) |
| 113 | ff_llviddsp_init_x86(c); |
| 114 | } |
| 115 |