libmpcodecs/vf_gradfun.c

   1 /*
   2  * Copyright (C) 2009 Loren Merritt <lorenm@u.washignton.edu>
   3  *
   4  * This file is part of MPlayer.
   5  *
   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.
  10  *
  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.
  15  *
  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.
  19  */
  20
  21 /*
  22  * Debanding algorithm (from gradfun2db by prunedtree):
  23  * Boxblur.
  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.
  28  */
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <inttypes.h>
  34
  35 #include "config.h"
  36 #include "cpudetect.h"
  37 #include "img_format.h"
  38 #include "mp_image.h"
  39 #include "vf.h"
  40 #include "libvo/fastmemcpy.h"
  41 #include "libavutil/avutil.h"
  42 #include "ffmpeg_files/x86_cpu.h"
  43
  44 struct vf_priv_s {
  45     int thresh;
  46     int radius;
  47     uint16_t *buf;
  48     void (*filter_line)(uint8_t *dst, uint8_t *src, uint16_t *dc,
  49                         int width, int thresh, const uint16_t *dithers);
  50     void (*blur_line)(uint16_t *dc, uint16_t *buf, uint16_t *buf1,
  51                       uint8_t *src, int sstride, int width);
  52 };
  53
  54 static const uint16_t __attribute__((aligned(16))) pw_7f[8] = {127,127,127,127,127,127,127,127};
  55 static const uint16_t __attribute__((aligned(16))) pw_ff[8] = {255,255,255,255,255,255,255,255};
  56 static const uint16_t __attribute__((aligned(16))) dither[8][8] = {
  57     {  0, 96, 24,120,  6,102, 30,126 },
  58     { 64, 32, 88, 56, 70, 38, 94, 62 },
  59     { 16,112,  8,104, 22,118, 14,110 },
  60     { 80, 48, 72, 40, 86, 54, 78, 46 },
  61     {  4,100, 28,124,  2, 98, 26,122 },
  62     { 68, 36, 92, 60, 66, 34, 90, 58 },
  63     { 20,116, 12,108, 18,114, 10,106 },
  64     { 84, 52, 76, 44, 82, 50, 74, 42 },
  65 };
  66
  67 static void filter_line_c(uint8_t *dst, uint8_t *src, uint16_t *dc,
  68                           int width, int thresh, const uint16_t *dithers)
  69 {
  70     int x;
  71     for (x=0; x<width; x++, dc+=x&1) {
  72         int pix = src[x]<<7;
  73         int delta = dc[0] - pix;
  74         int m = abs(delta) * thresh >> 16;
  75         m = FFMAX(0, 127-m);
  76         m = m*m*delta >> 14;
  77         pix += m + dithers[x&7];
  78         dst[x] = av_clip_uint8(pix>>7);
  79     }
  80 }
  81
  82 static void blur_line_c(uint16_t *dc, uint16_t *buf, uint16_t *buf1,
  83                         uint8_t *src, int sstride, int width)
  84 {
  85     int x, v, old;
  86     for (x=0; x<width; x++) {
  87         v = buf1[x] + src[2*x] + src[2*x+1] + src[2*x+sstride] + src[2*x+1+sstride];
  88         old = buf[x];
  89         buf[x] = v;
  90         dc[x] = v - old;
  91     }
  92 }
  93
  94 #if HAVE_MMX2
  95 static void filter_line_mmx2(uint8_t *dst, uint8_t *src, uint16_t *dc,
  96                              int width, int thresh, const uint16_t *dithers)
  97 {
  98     intptr_t x;
  99     if (width&3) {
 100         x = width&~3;
 101         filter_line_c(dst+x, src+x, dc+x/2, width-x, thresh, dithers);
 102         width = x;
 103     }
 104     x = -width;
 105     __asm__ volatile(
 106         "movd          %4, %%mm5 \n"
 107         "pxor       %%mm7, %%mm7 \n"
 108         "pshufw $0, %%mm5, %%mm5 \n"
 109         "movq          %6, %%mm6 \n"
 110         "movq          %5, %%mm4 \n"
 111         "1: \n"
 112         "movd     (%2,%0), %%mm0 \n"
 113         "movd     (%3,%0), %%mm1 \n"
 114         "punpcklbw  %%mm7, %%mm0 \n"
 115         "punpcklwd  %%mm1, %%mm1 \n"
 116         "psllw         $7, %%mm0 \n"
 117         "pxor       %%mm2, %%mm2 \n"
 118         "psubw      %%mm0, %%mm1 \n" // delta = dc - pix
 119         "psubw      %%mm1, %%mm2 \n"
 120         "pmaxsw     %%mm1, %%mm2 \n"
 121         "pmulhuw    %%mm5, %%mm2 \n" // m = abs(delta) * thresh >> 16
 122         "psubw      %%mm6, %%mm2 \n"
 123         "pminsw     %%mm7, %%mm2 \n" // m = -max(0, 127-m)
 124         "pmullw     %%mm2, %%mm2 \n"
 125         "paddw      %%mm4, %%mm0 \n" // pix += dither
 126         "pmulhw     %%mm2, %%mm1 \n"
 127         "psllw         $2, %%mm1 \n" // m = m*m*delta >> 14
 128         "paddw      %%mm1, %%mm0 \n" // pix += m
 129         "psraw         $7, %%mm0 \n"
 130         "packuswb   %%mm0, %%mm0 \n"
 131         "movd       %%mm0, (%1,%0) \n" // dst = clip(pix>>7)
 132         "add           $4, %0 \n"
 133         "jl 1b \n"
 134         "emms \n"
 135         :"+r"(x)
 136         :"r"(dst+width), "r"(src+width), "r"(dc+width/2),
 137          "rm"(thresh), "m"(*dithers), "m"(*pw_7f)
 138         :"memory"
 139     );
 140 }
 141 #endif
 142
 143 #if HAVE_SSSE3
 144 static void filter_line_ssse3(uint8_t *dst, uint8_t *src, uint16_t *dc,
 145                               int width, int thresh, const uint16_t *dithers)
 146 {
 147     intptr_t x;
 148     if (width&7) {
 149         // could be 10% faster if I somehow eliminated this
 150         x = width&~7;
 151         filter_line_c(dst+x, src+x, dc+x/2, width-x, thresh, dithers);
 152         width = x;
 153     }
 154     x = -width;
 155     __asm__ volatile(
 156         "movd           %4, %%xmm5 \n"
 157         "pxor       %%xmm7, %%xmm7 \n"
 158         "pshuflw $0,%%xmm5, %%xmm5 \n"
 159         "movdqa         %6, %%xmm6 \n"
 160         "punpcklqdq %%xmm5, %%xmm5 \n"
 161         "movdqa         %5, %%xmm4 \n"
 162         "1: \n"
 163         "movq      (%2,%0), %%xmm0 \n"
 164         "movq      (%3,%0), %%xmm1 \n"
 165         "punpcklbw  %%xmm7, %%xmm0 \n"
 166         "punpcklwd  %%xmm1, %%xmm1 \n"
 167         "psllw          $7, %%xmm0 \n"
 168         "psubw      %%xmm0, %%xmm1 \n" // delta = dc - pix
 169         "pabsw      %%xmm1, %%xmm2 \n"
 170         "pmulhuw    %%xmm5, %%xmm2 \n" // m = abs(delta) * thresh >> 16
 171         "psubw      %%xmm6, %%xmm2 \n"
 172         "pminsw     %%xmm7, %%xmm2 \n" // m = -max(0, 127-m)
 173         "pmullw     %%xmm2, %%xmm2 \n"
 174         "psllw          $1, %%xmm2 \n"
 175         "paddw      %%xmm4, %%xmm0 \n" // pix += dither
 176         "pmulhrsw   %%xmm2, %%xmm1 \n" // m = m*m*delta >> 14
 177         "paddw      %%xmm1, %%xmm0 \n" // pix += m
 178         "psraw          $7, %%xmm0 \n"
 179         "packuswb   %%xmm0, %%xmm0 \n"
 180         "movq       %%xmm0, (%1,%0) \n" // dst = clip(pix>>7)
 181         "add            $8, %0 \n"
 182         "jl 1b \n"
 183         :"+&r"(x)
 184         :"r"(dst+width), "r"(src+width), "r"(dc+width/2),
 185          "rm"(thresh), "m"(*dithers), "m"(*pw_7f)
 186         :"memory"
 187     );
 188 }
 189 #endif // HAVE_SSSE3
 190
 191 #if HAVE_SSE2 && HAVE_6REGS
 192 #define BLURV(load)\
 193     intptr_t x = -2*width;\
 194     __asm__ volatile(\
 195         "movdqa %6, %%xmm7 \n"\
 196         "1: \n"\
 197         load"   (%4,%0), %%xmm0 \n"\
 198         load"   (%5,%0), %%xmm1 \n"\
 199         "movdqa  %%xmm0, %%xmm2 \n"\
 200         "movdqa  %%xmm1, %%xmm3 \n"\
 201         "psrlw       $8, %%xmm0 \n"\
 202         "psrlw       $8, %%xmm1 \n"\
 203         "pand    %%xmm7, %%xmm2 \n"\
 204         "pand    %%xmm7, %%xmm3 \n"\
 205         "paddw   %%xmm1, %%xmm0 \n"\
 206         "paddw   %%xmm3, %%xmm2 \n"\
 207         "paddw   %%xmm2, %%xmm0 \n"\
 208         "paddw  (%2,%0), %%xmm0 \n"\
 209         "movdqa (%1,%0), %%xmm1 \n"\
 210         "movdqa  %%xmm0, (%1,%0) \n"\
 211         "psubw   %%xmm1, %%xmm0 \n"\
 212         "movdqa  %%xmm0, (%3,%0) \n"\
 213         "add        $16, %0 \n"\
 214         "jl 1b \n"\
 215         :"+&r"(x)\
 216         :"r"(buf+width),\
 217          "r"(buf1+width),\
 218          "r"(dc+width),\
 219          "r"(src+width*2),\
 220          "r"(src+width*2+sstride),\
 221          "m"(*pw_ff)\
 222         :"memory"\
 223     );
 224
 225 static void blur_line_sse2(uint16_t *dc, uint16_t *buf, uint16_t *buf1,
 226                            uint8_t *src, int sstride, int width)
 227 {
 228     if (((intptr_t)src|sstride)&15) {
 229         BLURV("movdqu");
 230     } else {
 231         BLURV("movdqa");
 232     }
 233 }
 234 #endif // HAVE_6REGS && HAVE_SSE2
 235
 236 static void filter(struct vf_priv_s *ctx, uint8_t *dst, uint8_t *src,
 237                    int width, int height, int dstride, int sstride, int r)
 238 {
 239     int bstride = ((width+15)&~15)/2;
 240     int y;
 241     uint32_t dc_factor = (1<<21)/(r*r);
 242     uint16_t *dc = ctx->buf+16;
 243     uint16_t *buf = ctx->buf+bstride+32;
 244     int thresh = ctx->thresh;
 245
 246     memset(dc, 0, (bstride+16)*sizeof(*buf));
 247     for (y=0; y<r; y++)
 248         ctx->blur_line(dc, buf+y*bstride, buf+(y-1)*bstride, src+2*y*sstride, sstride, width/2);
 249     for (;;) {
 250         if (y < height-r) {
 251             int mod = ((y+r)/2)%r;
 252             uint16_t *buf0 = buf+mod*bstride;
 253             uint16_t *buf1 = buf+(mod?mod-1:r-1)*bstride;
 254             int x, v;
 255             ctx->blur_line(dc, buf0, buf1, src+(y+r)*sstride, sstride, width/2);
 256             for (x=v=0; x<r; x++)
 257                 v += dc[x];
 258             for (; x<width/2; x++) {
 259                 v += dc[x] - dc[x-r];
 260                 dc[x-r] = v * dc_factor >> 16;
 261             }
 262             for (; x<(width+r+1)/2; x++)
 263                 dc[x-r] = v * dc_factor >> 16;
 264             for (x=-r/2; x<0; x++)
 265                 dc[x] = dc[0];
 266         }
 267         if (y == r) {
 268             for (y=0; y<r; y++)
 269                 ctx->filter_line(dst+y*dstride, src+y*sstride, dc-r/2, width, thresh, dither[y&7]);
 270         }
 271         ctx->filter_line(dst+y*dstride, src+y*sstride, dc-r/2, width, thresh, dither[y&7]);
 272         if (++y >= height) break;
 273         ctx->filter_line(dst+y*dstride, src+y*sstride, dc-r/2, width, thresh, dither[y&7]);
 274         if (++y >= height) break;
 275     }
 276 }
 277
 278 static void get_image(struct vf_instance *vf, mp_image_t *mpi)
 279 {
 280     if (mpi->flags&MP_IMGFLAG_PRESERVE) return; // don't change
 281     // ok, we can do pp in-place:
 282     vf->dmpi = vf_get_image(vf->next, mpi->imgfmt,
 283                             mpi->type, mpi->flags, mpi->width, mpi->height);
 284     mpi->planes[0] = vf->dmpi->planes[0];
 285     mpi->stride[0] = vf->dmpi->stride[0];
 286     mpi->width = vf->dmpi->width;
 287     if (mpi->flags&MP_IMGFLAG_PLANAR){
 288         mpi->planes[1] = vf->dmpi->planes[1];
 289         mpi->planes[2] = vf->dmpi->planes[2];
 290         mpi->stride[1] = vf->dmpi->stride[1];
 291         mpi->stride[2] = vf->dmpi->stride[2];
 292     }
 293     mpi->flags |= MP_IMGFLAG_DIRECT;
 294 }
 295
 296 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts)
 297 {
 298     mp_image_t *dmpi = vf->dmpi;
 299     int p;
 300
 301     if (!(mpi->flags&MP_IMGFLAG_DIRECT)) {
 302         // no DR, so get a new image. hope we'll get DR buffer:
 303         dmpi = vf_get_image(vf->next,mpi->imgfmt, MP_IMGTYPE_TEMP,
 304                             MP_IMGFLAG_ACCEPT_STRIDE|MP_IMGFLAG_PREFER_ALIGNED_STRIDE,
 305                             mpi->w, mpi->h);
 306     }
 307     vf_clone_mpi_attributes(dmpi, mpi);
 308
 309     for (p=0; p<mpi->num_planes; p++) {
 310         int w = mpi->w;
 311         int h = mpi->h;
 312         int r = vf->priv->radius;
 313         if (p) {
 314             w >>= mpi->chroma_x_shift;
 315             h >>= mpi->chroma_y_shift;
 316             r = ((r>>mpi->chroma_x_shift) + (r>>mpi->chroma_y_shift)) / 2;
 317             r = av_clip((r+1)&~1,4,32);
 318         }
 319         if (FFMIN(w,h) > 2*r)
 320             filter(vf->priv, dmpi->planes[p], mpi->planes[p], w, h,
 321                              dmpi->stride[p], mpi->stride[p], r);
 322         else if (dmpi->planes[p] != mpi->planes[p])
 323             memcpy_pic(dmpi->planes[p], mpi->planes[p], w, h,
 324                        dmpi->stride[p], mpi->stride[p]);
 325     }
 326
 327     return vf_next_put_image(vf, dmpi, pts);
 328 }
 329
 330 static int query_format(struct vf_instance *vf, unsigned int fmt)
 331 {
 332     switch (fmt){
 333     case IMGFMT_YVU9:
 334     case IMGFMT_IF09:
 335     case IMGFMT_YV12:
 336     case IMGFMT_I420:
 337     case IMGFMT_IYUV:
 338     case IMGFMT_CLPL:
 339     case IMGFMT_Y800:
 340     case IMGFMT_Y8:
 341     case IMGFMT_NV12:
 342     case IMGFMT_NV21:
 343     case IMGFMT_444P:
 344     case IMGFMT_422P:
 345     case IMGFMT_411P:
 346     case IMGFMT_HM12:
 347         return vf_next_query_format(vf,fmt);
 348     }
 349     return 0;
 350 }
 351
 352 static int config(struct vf_instance *vf,
 353                   int width, int height, int d_width, int d_height,
 354                   unsigned int flags, unsigned int outfmt)
 355 {
 356     free(vf->priv->buf);
 357     vf->priv->buf = av_mallocz((((width+15)&~15)*(vf->priv->radius+1)/2+32)*sizeof(uint16_t));
 358     return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
 359 }
 360
 361 static void uninit(struct vf_instance *vf)
 362 {
 363     if (!vf->priv) return;
 364     av_free(vf->priv->buf);
 365     free(vf->priv);
 366     vf->priv = NULL;
 367 }
 368
 369 static int vf_open(vf_instance_t *vf, char *args)
 370 {
 371     float thresh = 1.2;
 372     int radius = 16;
 373
 374     vf->get_image=get_image;
 375     vf->put_image=put_image;
 376     vf->query_format=query_format;
 377     vf->config=config;
 378     vf->uninit=uninit;
 379     vf->priv=malloc(sizeof(struct vf_priv_s));
 380     memset(vf->priv, 0, sizeof(struct vf_priv_s));
 381
 382     if (args) sscanf(args, "%f:%d", &thresh, &radius);
 383     vf->priv->thresh = (1<<15)/av_clipf(thresh,0.51,255);
 384     vf->priv->radius = av_clip((radius+1)&~1,4,32);
 385
 386     vf->priv->blur_line = blur_line_c;
 387     vf->priv->filter_line = filter_line_c;
 388 #if HAVE_SSE2 && HAVE_6REGS
 389     if (gCpuCaps.hasSSE2)
 390         vf->priv->blur_line = blur_line_sse2;
 391 #endif
 392 #if HAVE_MMX2
 393     if (gCpuCaps.hasMMX2)
 394         vf->priv->filter_line = filter_line_mmx2;
 395 #endif
 396 #if HAVE_SSSE3
 397     if (gCpuCaps.hasSSSE3)
 398         vf->priv->filter_line = filter_line_ssse3;
 399 #endif
 400
 401     return 1;
 402 }
 403
 404 const vf_info_t vf_info_gradfun = {
 405     "gradient deband",
 406     "gradfun",
 407     "Loren Merritt",
 408     "",
 409     vf_open,
 410     NULL
 411 };