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huffyuvencdsp.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 #include "libavutil/attributes.h"
21 #include "huffyuvencdsp.h"
22 #include "mathops.h"
23 
24 // 0x00010001 or 0x0001000100010001 or whatever, depending on the cpu's native arithmetic size
25 #define pw_1 (ULONG_MAX / UINT16_MAX)
26 
27 static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w){
28  long i;
29 #if !HAVE_FAST_UNALIGNED
30  if((long)src2 & (sizeof(long)-1)){
31  for(i=0; i+3<w; i+=4){
32  dst[i+0] = (src1[i+0]-src2[i+0]) & mask;
33  dst[i+1] = (src1[i+1]-src2[i+1]) & mask;
34  dst[i+2] = (src1[i+2]-src2[i+2]) & mask;
35  dst[i+3] = (src1[i+3]-src2[i+3]) & mask;
36  }
37  }else
38 #endif
39  {
40  unsigned long pw_lsb = (mask >> 1) * pw_1;
41  unsigned long pw_msb = pw_lsb + pw_1;
42 
43  for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) {
44  long a = *(long*)(src1+i);
45  long b = *(long*)(src2+i);
46  *(long*)(dst+i) = ((a|pw_msb) - (b&pw_lsb)) ^ ((a^b^pw_msb)&pw_msb);
47  }
48  }
49  for (; i<w; i++)
50  dst[i] = (src1[i] - src2[i]) & mask;
51 }
52 
53 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){
54  int i;
55  uint16_t l, lt;
56 
57  l = *left;
58  lt = *left_top;
59 
60  for(i=0; i<w; i++){
61  const int pred = mid_pred(l, src1[i], (l + src1[i] - lt) & mask);
62  lt = src1[i];
63  l = src2[i];
64  dst[i] = (l - pred) & mask;
65  }
66 
67  *left = l;
68  *left_top = lt;
69 }
70 
72 {
75 
76  if (ARCH_X86)
77  ff_huffyuvencdsp_init_x86(c, avctx);
78 }
void(* sub_hfyu_median_pred_int16)(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w, int *left, int *left_top)
Definition: huffyuvencdsp.h:32
void(* diff_int16)(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w)
Definition: huffyuvencdsp.h:27
const char * b
Definition: vf_curves.c:113
void ff_huffyuvencdsp_init_x86(HuffYUVEncDSPContext *c, AVCodecContext *avctx)
Macro definitions for various function/variable attributes.
av_cold void ff_huffyuvencdsp_init(HuffYUVEncDSPContext *c, AVCodecContext *avctx)
Definition: huffyuvencdsp.c:71
#define av_cold
Definition: attributes.h:82
static const uint16_t mask[17]
Definition: lzw.c:38
#define pw_1
Definition: huffyuvencdsp.c:25
static const float pred[4]
Definition: siprdata.h:259
#define src1
Definition: h264pred.c:139
main external API structure.
Definition: avcodec.h:1502
#define mid_pred
Definition: mathops.h:97
int
static double c[64]
static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w)
Definition: huffyuvencdsp.c:27
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)
Definition: huffyuvencdsp.c:53