2 * Copyright (C) 2009 Loren Merritt <lorenm@u.washignton.edu>
4 * This file is part of MPlayer.
6 * MPlayer is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * MPlayer is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 * Debanding algorithm (from gradfun2db by prunedtree):
24 * Foreach pixel, if it's within threshold of the blurred value, make it closer.
25 * So now we have a smoothed and higher bitdepth version of all the shallow
26 * gradients, while leaving detailed areas untouched.
27 * Dither it back to 8bit.
34 void (*filter_line)(uint8_t *dst, uint8_t *src, uint16_t *dc,
35 int width, int thresh, const uint16_t *dithers);
36 void (*blur_line)(uint16_t *dc, uint16_t *buf, uint16_t *buf1,
37 uint8_t *src, int sstride, int width);
40 static const uint16_t __attribute__((aligned(16))) pw_7f[8] = {127,127,127,127,127,127,127,127};
41 static const uint16_t __attribute__((aligned(16))) pw_ff[8] = {255,255,255,255,255,255,255,255};
42 static const uint16_t __attribute__((aligned(16))) dither[8][8] = {
43 { 0, 96, 24,120, 6,102, 30,126 },
44 { 64, 32, 88, 56, 70, 38, 94, 62 },
45 { 16,112, 8,104, 22,118, 14,110 },
46 { 80, 48, 72, 40, 86, 54, 78, 46 },
47 { 4,100, 28,124, 2, 98, 26,122 },
48 { 68, 36, 92, 60, 66, 34, 90, 58 },
49 { 20,116, 12,108, 18,114, 10,106 },
50 { 84, 52, 76, 44, 82, 50, 74, 42 },
53 static void filter_line_c(uint8_t *dst, uint8_t *src, uint16_t *dc,
54 int width, int thresh, const uint16_t *dithers)
57 for (x=0; x<width; x++, dc+=x&1) {
59 int delta = dc[0] - pix;
60 int m = abs(delta) * thresh >> 16;
63 pix += m + dithers[x&7];
64 dst[x] = av_clip_uint8(pix>>7);
68 static void blur_line_c(uint16_t *dc, uint16_t *buf, uint16_t *buf1,
69 uint8_t *src, int sstride, int width)
72 for (x=0; x<width; x++) {
73 v = buf1[x] + src[2*x] + src[2*x+1] + src[2*x+sstride] + src[2*x+1+sstride];
81 static void filter_line_mmx2(uint8_t *dst, uint8_t *src, uint16_t *dc,
82 int width, int thresh, const uint16_t *dithers)
87 filter_line_c(dst+x, src+x, dc+x/2, width-x, thresh, dithers);
93 "pxor %%mm7, %%mm7 \n"
94 "pshufw $0, %%mm5, %%mm5 \n"
98 "movd (%2,%0), %%mm0 \n"
99 "movd (%3,%0), %%mm1 \n"
100 "punpcklbw %%mm7, %%mm0 \n"
101 "punpcklwd %%mm1, %%mm1 \n"
103 "pxor %%mm2, %%mm2 \n"
104 "psubw %%mm0, %%mm1 \n" // delta = dc - pix
105 "psubw %%mm1, %%mm2 \n"
106 "pmaxsw %%mm1, %%mm2 \n"
107 "pmulhuw %%mm5, %%mm2 \n" // m = abs(delta) * thresh >> 16
108 "psubw %%mm6, %%mm2 \n"
109 "pminsw %%mm7, %%mm2 \n" // m = -max(0, 127-m)
110 "pmullw %%mm2, %%mm2 \n"
111 "paddw %%mm4, %%mm0 \n" // pix += dither
112 "pmulhw %%mm2, %%mm1 \n"
113 "psllw $2, %%mm1 \n" // m = m*m*delta >> 14
114 "paddw %%mm1, %%mm0 \n" // pix += m
116 "packuswb %%mm0, %%mm0 \n"
117 "movd %%mm0, (%1,%0) \n" // dst = clip(pix>>7)
122 :"r"(dst+width), "r"(src+width), "r"(dc+width/2),
123 "rm"(thresh), "m"(*dithers), "m"(*pw_7f)
130 static void filter_line_ssse3(uint8_t *dst, uint8_t *src, uint16_t *dc,
131 int width, int thresh, const uint16_t *dithers)
135 // could be 10% faster if I somehow eliminated this
137 filter_line_c(dst+x, src+x, dc+x/2, width-x, thresh, dithers);
143 "pxor %%xmm7, %%xmm7 \n"
144 "pshuflw $0,%%xmm5, %%xmm5 \n"
145 "movdqa %6, %%xmm6 \n"
146 "punpcklqdq %%xmm5, %%xmm5 \n"
147 "movdqa %5, %%xmm4 \n"
149 "movq (%2,%0), %%xmm0 \n"
150 "movq (%3,%0), %%xmm1 \n"
151 "punpcklbw %%xmm7, %%xmm0 \n"
152 "punpcklwd %%xmm1, %%xmm1 \n"
153 "psllw $7, %%xmm0 \n"
154 "psubw %%xmm0, %%xmm1 \n" // delta = dc - pix
155 "pabsw %%xmm1, %%xmm2 \n"
156 "pmulhuw %%xmm5, %%xmm2 \n" // m = abs(delta) * thresh >> 16
157 "psubw %%xmm6, %%xmm2 \n"
158 "pminsw %%xmm7, %%xmm2 \n" // m = -max(0, 127-m)
159 "pmullw %%xmm2, %%xmm2 \n"
160 "psllw $1, %%xmm2 \n"
161 "paddw %%xmm4, %%xmm0 \n" // pix += dither
162 "pmulhrsw %%xmm2, %%xmm1 \n" // m = m*m*delta >> 14
163 "paddw %%xmm1, %%xmm0 \n" // pix += m
164 "psraw $7, %%xmm0 \n"
165 "packuswb %%xmm0, %%xmm0 \n"
166 "movq %%xmm0, (%1,%0) \n" // dst = clip(pix>>7)
170 :"r"(dst+width), "r"(src+width), "r"(dc+width/2),
171 "rm"(thresh), "m"(*dithers), "m"(*pw_7f)
177 #if HAVE_SSE2 && HAVE_6REGS
179 intptr_t x = -2*width;\
181 "movdqa %6, %%xmm7 \n"\
183 load" (%4,%0), %%xmm0 \n"\
184 load" (%5,%0), %%xmm1 \n"\
185 "movdqa %%xmm0, %%xmm2 \n"\
186 "movdqa %%xmm1, %%xmm3 \n"\
187 "psrlw $8, %%xmm0 \n"\
188 "psrlw $8, %%xmm1 \n"\
189 "pand %%xmm7, %%xmm2 \n"\
190 "pand %%xmm7, %%xmm3 \n"\
191 "paddw %%xmm1, %%xmm0 \n"\
192 "paddw %%xmm3, %%xmm2 \n"\
193 "paddw %%xmm2, %%xmm0 \n"\
194 "paddw (%2,%0), %%xmm0 \n"\
195 "movdqa (%1,%0), %%xmm1 \n"\
196 "movdqa %%xmm0, (%1,%0) \n"\
197 "psubw %%xmm1, %%xmm0 \n"\
198 "movdqa %%xmm0, (%3,%0) \n"\
206 "r"(src+width*2+sstride),\
211 static void blur_line_sse2(uint16_t *dc, uint16_t *buf, uint16_t *buf1,
212 uint8_t *src, int sstride, int width)
214 if (((intptr_t)src|sstride)&15) {
220 #endif // HAVE_6REGS && HAVE_SSE2
222 static void filter_plane(struct vf_priv_s *ctx, uint8_t *dst, uint8_t *src,
223 int width, int height, int dstride, int sstride, int r)
225 int bstride = ((width+15)&~15)/2;
227 uint32_t dc_factor = (1<<21)/(r*r);
228 uint16_t *dc = ctx->buf+16;
229 uint16_t *buf = ctx->buf+bstride+32;
230 int thresh = ctx->thresh;
232 memset(dc, 0, (bstride+16)*sizeof(*buf));
234 ctx->blur_line(dc, buf+y*bstride, buf+(y-1)*bstride, src+2*y*sstride, sstride, width/2);
237 int mod = ((y+r)/2)%r;
238 uint16_t *buf0 = buf+mod*bstride;
239 uint16_t *buf1 = buf+(mod?mod-1:r-1)*bstride;
241 ctx->blur_line(dc, buf0, buf1, src+(y+r)*sstride, sstride, width/2);
242 for (x=v=0; x<r; x++)
244 for (; x<width/2; x++) {
245 v += dc[x] - dc[x-r];
246 dc[x-r] = v * dc_factor >> 16;
248 for (; x<(width+r+1)/2; x++)
249 dc[x-r] = v * dc_factor >> 16;
250 for (x=-r/2; x<0; x++)
255 ctx->filter_line(dst+y*dstride, src+y*sstride, dc-r/2, width, thresh, dither[y&7]);
257 ctx->filter_line(dst+y*dstride, src+y*sstride, dc-r/2, width, thresh, dither[y&7]);
258 if (++y >= height) break;
259 ctx->filter_line(dst+y*dstride, src+y*sstride, dc-r/2, width, thresh, dither[y&7]);
260 if (++y >= height) break;