repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * This file is part of FFmpeg. | |
| 3 | * | |
| 4 | * FFmpeg is free software; you can redistribute it and/or | |
| 5 | * modify it under the terms of the GNU Lesser General Public | |
| 6 | * License as published by the Free Software Foundation; either | |
| 7 | * version 2.1 of the License, or (at your option) any later version. | |
| 8 | * | |
| 9 | * FFmpeg is distributed in the hope that it will be useful, | |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | * Lesser General Public License for more details. | |
| 13 | * | |
| 14 | * You should have received a copy of the GNU Lesser General Public | |
| 15 | * License along with FFmpeg; if not, write to the Free Software | |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 17 | */ | |
| 18 | ||
| 19 | #include "config.h" | |
| 20 | #include "libavutil/attributes.h" | |
| 21 | #include "huffyuvencdsp.h" | |
| 22 | #include "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 diff_bytes_c(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, int w) | |
| 29 | { | |
| 30 | long i; | |
| 31 | ||
| 32 | #if !HAVE_FAST_UNALIGNED | |
| 33 | if (((long)src1 | (long)src2) & (sizeof(long) - 1)) { | |
| 34 | for (i = 0; i + 7 < w; i += 8) { | |
| 35 | dst[i + 0] = src1[i + 0] - src2[i + 0]; | |
| 36 | dst[i + 1] = src1[i + 1] - src2[i + 1]; | |
| 37 | dst[i + 2] = src1[i + 2] - src2[i + 2]; | |
| 38 | dst[i + 3] = src1[i + 3] - src2[i + 3]; | |
| 39 | dst[i + 4] = src1[i + 4] - src2[i + 4]; | |
| 40 | dst[i + 5] = src1[i + 5] - src2[i + 5]; | |
| 41 | dst[i + 6] = src1[i + 6] - src2[i + 6]; | |
| 42 | dst[i + 7] = src1[i + 7] - src2[i + 7]; | |
| 43 | } | |
| 44 | } else | |
| 45 | #endif | |
| 46 | for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) { | |
| 47 | long a = *(long *) (src1 + i); | |
| 48 | long b = *(long *) (src2 + i); | |
| 49 | *(long *) (dst + i) = ((a | pb_80) - (b & pb_7f)) ^ | |
| 50 | ((a ^ b ^ pb_80) & pb_80); | |
| 51 | } | |
| 52 | for (; i < w; i++) | |
| 53 | dst[i + 0] = src1[i + 0] - src2[i + 0]; | |
| 54 | } | |
| 55 | ||
| 56 | static void sub_hfyu_median_pred_c(uint8_t *dst, const uint8_t *src1, | |
| 57 | const uint8_t *src2, int w, | |
| 58 | int *left, int *left_top) | |
| 59 | { | |
| 60 | int i; | |
| 61 | uint8_t l, lt; | |
| 62 | ||
| 63 | l = *left; | |
| 64 | lt = *left_top; | |
| 65 | ||
| 66 | for (i = 0; i < w; i++) { | |
| 67 | const int pred = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF); | |
| 68 | lt = src1[i]; | |
| 69 | l = src2[i]; | |
| 70 | dst[i] = l - pred; | |
| 71 | } | |
| 72 | ||
| 73 | *left = l; | |
| 74 | *left_top = lt; | |
| 75 | } | |
| 76 | ||
| 77 | av_cold void ff_huffyuvencdsp_init(HuffYUVEncDSPContext *c) | |
| 78 | { | |
| 79 | c->diff_bytes = diff_bytes_c; | |
| 80 | c->sub_hfyu_median_pred = sub_hfyu_median_pred_c; | |
| 81 | ||
| 82 | if (ARCH_X86) | |
| 83 | ff_huffyuvencdsp_init_x86(c); | |
| 84 | } |