| /* |
| * Lossless video DSP utils |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "avcodec.h" |
| #include "lossless_videodsp.h" |
| #include "libavcodec/mathops.h" |
| |
| // 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size |
| #define pb_7f (~0UL / 255 * 0x7f) |
| #define pb_80 (~0UL / 255 * 0x80) |
| |
| static void add_bytes_c(uint8_t *dst, uint8_t *src, ptrdiff_t w) |
| { |
| long i; |
| |
| for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) { |
| long a = *(long *) (src + i); |
| long b = *(long *) (dst + i); |
| *(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80); |
| } |
| for (; i < w; i++) |
| dst[i + 0] += src[i + 0]; |
| } |
| |
| static void add_median_pred_c(uint8_t *dst, const uint8_t *src1, |
| const uint8_t *diff, ptrdiff_t w, |
| int *left, int *left_top) |
| { |
| int i; |
| uint8_t l, lt; |
| |
| l = *left; |
| lt = *left_top; |
| |
| for (i = 0; i < w; i++) { |
| l = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i]; |
| lt = src1[i]; |
| dst[i] = l; |
| } |
| |
| *left = l; |
| *left_top = lt; |
| } |
| |
| static int add_left_pred_c(uint8_t *dst, const uint8_t *src, ptrdiff_t w, |
| int acc) |
| { |
| int i; |
| |
| for (i = 0; i < w - 1; i++) { |
| acc += src[i]; |
| dst[i] = acc; |
| i++; |
| acc += src[i]; |
| dst[i] = acc; |
| } |
| |
| for (; i < w; i++) { |
| acc += src[i]; |
| dst[i] = acc; |
| } |
| |
| return acc; |
| } |
| |
| static int add_left_pred_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, ptrdiff_t w, unsigned acc){ |
| int i; |
| |
| for(i=0; i<w-1; i++){ |
| acc+= src[i]; |
| dst[i]= acc &= mask; |
| i++; |
| acc+= src[i]; |
| dst[i]= acc &= mask; |
| } |
| |
| for(; i<w; i++){ |
| acc+= src[i]; |
| dst[i]= acc &= mask; |
| } |
| |
| return acc; |
| } |
| |
| static void add_gradient_pred_c(uint8_t *src, const ptrdiff_t stride, const ptrdiff_t width){ |
| int A, B, C, i; |
| |
| for (i = 0; i < width; i++) { |
| A = src[i - stride]; |
| B = src[i - (stride + 1)]; |
| C = src[i - 1]; |
| src[i] = (A - B + C + src[i]) & 0xFF; |
| } |
| } |
| |
| void ff_llviddsp_init(LLVidDSPContext *c) |
| { |
| c->add_bytes = add_bytes_c; |
| c->add_median_pred = add_median_pred_c; |
| c->add_left_pred = add_left_pred_c; |
| |
| c->add_left_pred_int16 = add_left_pred_int16_c; |
| c->add_gradient_pred = add_gradient_pred_c; |
| |
| if (ARCH_PPC) |
| ff_llviddsp_init_ppc(c); |
| if (ARCH_X86) |
| ff_llviddsp_init_x86(c); |
| } |