diff options
Diffstat (limited to 'libavcodec/lossless_videodsp.c')
-rw-r--r-- | libavcodec/lossless_videodsp.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/libavcodec/lossless_videodsp.c b/libavcodec/lossless_videodsp.c new file mode 100644 index 0000000..cff94c2 --- /dev/null +++ b/libavcodec/lossless_videodsp.c @@ -0,0 +1,125 @@ +/* + * 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); +} |