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/* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "config.h" |
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#include "libavutil/attributes.h" |
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#include "huffyuvencdsp.h" |
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#include "mathops.h" |
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// 0x00010001 or 0x0001000100010001 or whatever, depending on the cpu's native arithmetic size |
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#define pw_1 (ULONG_MAX / UINT16_MAX) |
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488200 |
static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w){ |
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long i; |
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#if !HAVE_FAST_UNALIGNED |
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if((long)src2 & (sizeof(long)-1)){ |
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for(i=0; i+3<w; i+=4){ |
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dst[i+0] = (src1[i+0]-src2[i+0]) & mask; |
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dst[i+1] = (src1[i+1]-src2[i+1]) & mask; |
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dst[i+2] = (src1[i+2]-src2[i+2]) & mask; |
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dst[i+3] = (src1[i+3]-src2[i+3]) & mask; |
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} |
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}else |
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#endif |
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{ |
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unsigned long pw_lsb = (mask >> 1) * pw_1; |
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488200 |
unsigned long pw_msb = pw_lsb + pw_1; |
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✓✓ |
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for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) { |
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long a = *(long*)(src1+i); |
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long b = *(long*)(src2+i); |
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*(long*)(dst+i) = ((a|pw_msb) - (b&pw_lsb)) ^ ((a^b^pw_msb)&pw_msb); |
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} |
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} |
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✓✓ |
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for (; i<w; i++) |
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dst[i] = (src1[i] - src2[i]) & mask; |
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} |
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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){ |
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int i; |
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uint16_t l, lt; |
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l = *left; |
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lt = *left_top; |
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for(i=0; i<w; i++){ |
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const int pred = mid_pred(l, src1[i], (l + src1[i] - lt) & mask); |
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lt = src1[i]; |
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l = src2[i]; |
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dst[i] = (l - pred) & mask; |
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} |
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*left = l; |
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*left_top = lt; |
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} |
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av_cold void ff_huffyuvencdsp_init(HuffYUVEncDSPContext *c, AVCodecContext *avctx) |
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{ |
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c->diff_int16 = diff_int16_c; |
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c->sub_hfyu_median_pred_int16 = sub_hfyu_median_pred_int16_c; |
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if (ARCH_X86) |
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ff_huffyuvencdsp_init_x86(c, avctx); |
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} |