diff options
Diffstat (limited to 'libavcodec/lossless_videodsp.c')
| -rw-r--r-- | libavcodec/lossless_videodsp.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/libavcodec/lossless_videodsp.c b/libavcodec/lossless_videodsp.c new file mode 100644 index 0000000000..3491621dc4 --- /dev/null +++ b/libavcodec/lossless_videodsp.c @@ -0,0 +1,128 @@ +/* + * 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" + +static void add_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, int w){ + long i; + unsigned long pw_lsb = (mask >> 1) * 0x0001000100010001ULL; + unsigned long pw_msb = pw_lsb + 0x0001000100010001ULL; + for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) { + long a = *(long*)(src+i); + long b = *(long*)(dst+i); + *(long*)(dst+i) = ((a&pw_lsb) + (b&pw_lsb)) ^ ((a^b)&pw_msb); + } + for(; i<w; i++) + dst[i] = (dst[i] + src[i]) & mask; +} + +static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w){ + long i; +#if !HAVE_FAST_UNALIGNED + if((long)src2 & (sizeof(long)-1)){ + for(i=0; i+3<w; i+=4){ + dst[i+0] = (src1[i+0]-src2[i+0]) & mask; + dst[i+1] = (src1[i+1]-src2[i+1]) & mask; + dst[i+2] = (src1[i+2]-src2[i+2]) & mask; + dst[i+3] = (src1[i+3]-src2[i+3]) & mask; + } + }else +#endif + { + unsigned long pw_lsb = (mask >> 1) * 0x0001000100010001ULL; + unsigned long pw_msb = pw_lsb + 0x0001000100010001ULL; + + for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) { + long a = *(long*)(src1+i); + long b = *(long*)(src2+i); + *(long*)(dst+i) = ((a|pw_msb) - (b&pw_lsb)) ^ ((a^b^pw_msb)&pw_msb); + } + } + for (; i<w; i++) + dst[i] = (src1[i] - src2[i]) & mask; +} + +static void add_hfyu_median_pred_int16_c(uint16_t *dst, const uint16_t *src, const uint16_t *diff, unsigned mask, int w, int *left, int *left_top){ + int i; + uint16_t l, lt; + + l = *left; + lt = *left_top; + + for(i=0; i<w; i++){ + l = (mid_pred(l, src[i], (l + src[i] - lt) & mask) + diff[i]) & mask; + lt = src[i]; + dst[i] = l; + } + + *left = l; + *left_top = lt; +} + +static void sub_hfyu_median_pred_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w, int *left, int *left_top){ + int i; + uint16_t l, lt; + + l = *left; + lt = *left_top; + + for(i=0; i<w; i++){ + const int pred = mid_pred(l, src1[i], (l + src1[i] - lt) & mask); + lt = src1[i]; + l = src2[i]; + dst[i] = (l - pred) & mask; + } + + *left = l; + *left_top = lt; +} + +static int add_hfyu_left_pred_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, int 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; +} + + +void ff_llviddsp_init(LLVidDSPContext *c, AVCodecContext *avctx) +{ + c->add_int16 = add_int16_c; + c->diff_int16= diff_int16_c; + c->add_hfyu_left_pred_int16 = add_hfyu_left_pred_int16_c; + c->add_hfyu_median_pred_int16 = add_hfyu_median_pred_int16_c; + c->sub_hfyu_median_pred_int16 = sub_hfyu_median_pred_int16_c; + + if (ARCH_X86) + ff_llviddsp_init_x86(c, avctx); +} |