/* * 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); }