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  1. /*
  2.  * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; if not, write to the Free Software Foundation, Inc.,
  18.  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19.  */
  20.  
  21. /**
  22.  * @file
  23.  * Shape Adaptive Blur filter, ported from MPlayer libmpcodecs/vf_sab.c
  24.  */
  25.  
  26. #include "libavutil/opt.h"
  27. #include "libavutil/pixdesc.h"
  28. #include "libswscale/swscale.h"
  29.  
  30. #include "avfilter.h"
  31. #include "formats.h"
  32. #include "internal.h"
  33.  
  34. typedef struct {
  35.     float radius;
  36.     float pre_filter_radius;
  37.     float strength;
  38.     float quality;
  39.     struct SwsContext *pre_filter_context;
  40.     uint8_t *pre_filter_buf;
  41.     int pre_filter_linesize;
  42.     int dist_width;
  43.     int dist_linesize;
  44.     int *dist_coeff;
  45. #define COLOR_DIFF_COEFF_SIZE 512
  46.     int color_diff_coeff[COLOR_DIFF_COEFF_SIZE];
  47. } FilterParam;
  48.  
  49. typedef struct {
  50.     const AVClass *class;
  51.     FilterParam  luma;
  52.     FilterParam  chroma;
  53.     int          hsub;
  54.     int          vsub;
  55.     unsigned int sws_flags;
  56. } SabContext;
  57.  
  58. static int query_formats(AVFilterContext *ctx)
  59. {
  60.     static const enum AVPixelFormat pix_fmts[] = {
  61.         AV_PIX_FMT_YUV420P,
  62.         AV_PIX_FMT_YUV410P,
  63.         AV_PIX_FMT_YUV444P,
  64.         AV_PIX_FMT_YUV422P,
  65.         AV_PIX_FMT_YUV411P,
  66.         AV_PIX_FMT_NONE
  67.     };
  68.     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
  69.  
  70.     return 0;
  71. }
  72.  
  73. #define RADIUS_MIN 0.1
  74. #define RADIUS_MAX 4.0
  75.  
  76. #define PRE_FILTER_RADIUS_MIN 0.1
  77. #define PRE_FILTER_RADIUS_MAX 2.0
  78.  
  79. #define STRENGTH_MIN 0.1
  80. #define STRENGTH_MAX 100.0
  81.  
  82. #define OFFSET(x) offsetof(SabContext, x)
  83. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
  84.  
  85. static const AVOption sab_options[] = {
  86.     { "luma_radius",            "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
  87.     { "lr"         ,            "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
  88.     { "luma_pre_filter_radius", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
  89.     { "lpfr",                   "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
  90.     { "luma_strength",          "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
  91.     { "ls",                     "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
  92.  
  93.     { "chroma_radius",            "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
  94.     { "cr",                       "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
  95.     { "chroma_pre_filter_radius", "set chroma pre-filter radius",  OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1},
  96.                                   PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
  97.     { "cpfr",                     "set chroma pre-filter radius",  OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1},
  98.                                   PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
  99.     { "chroma_strength",          "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
  100.     { "cs",                       "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
  101.  
  102.     { NULL }
  103. };
  104.  
  105. AVFILTER_DEFINE_CLASS(sab);
  106.  
  107. static av_cold int init(AVFilterContext *ctx)
  108. {
  109.     SabContext *sab = ctx->priv;
  110.  
  111.     /* make chroma default to luma values, if not explicitly set */
  112.     if (sab->chroma.radius < RADIUS_MIN)
  113.         sab->chroma.radius = sab->luma.radius;
  114.     if (sab->chroma.pre_filter_radius < PRE_FILTER_RADIUS_MIN)
  115.         sab->chroma.pre_filter_radius = sab->luma.pre_filter_radius;
  116.     if (sab->chroma.strength < STRENGTH_MIN)
  117.         sab->chroma.strength = sab->luma.strength;
  118.  
  119.     sab->luma.quality = sab->chroma.quality = 3.0;
  120.     sab->sws_flags = SWS_POINT;
  121.  
  122.     av_log(ctx, AV_LOG_VERBOSE,
  123.            "luma_radius:%f luma_pre_filter_radius::%f luma_strength:%f "
  124.            "chroma_radius:%f chroma_pre_filter_radius:%f chroma_strength:%f\n",
  125.            sab->luma  .radius, sab->luma  .pre_filter_radius, sab->luma  .strength,
  126.            sab->chroma.radius, sab->chroma.pre_filter_radius, sab->chroma.strength);
  127.     return 0;
  128. }
  129.  
  130. static void close_filter_param(FilterParam *f)
  131. {
  132.     if (f->pre_filter_context) {
  133.         sws_freeContext(f->pre_filter_context);
  134.         f->pre_filter_context = NULL;
  135.     }
  136.     av_freep(&f->pre_filter_buf);
  137.     av_freep(&f->dist_coeff);
  138. }
  139.  
  140. static av_cold void uninit(AVFilterContext *ctx)
  141. {
  142.     SabContext *sab = ctx->priv;
  143.  
  144.     close_filter_param(&sab->luma);
  145.     close_filter_param(&sab->chroma);
  146. }
  147.  
  148. static int open_filter_param(FilterParam *f, int width, int height, unsigned int sws_flags)
  149. {
  150.     SwsVector *vec;
  151.     SwsFilter sws_f;
  152.     int i, x, y;
  153.     int linesize = FFALIGN(width, 8);
  154.  
  155.     f->pre_filter_buf = av_malloc(linesize * height);
  156.     if (!f->pre_filter_buf)
  157.         return AVERROR(ENOMEM);
  158.  
  159.     f->pre_filter_linesize = linesize;
  160.     vec = sws_getGaussianVec(f->pre_filter_radius, f->quality);
  161.     sws_f.lumH = sws_f.lumV = vec;
  162.     sws_f.chrH = sws_f.chrV = NULL;
  163.     f->pre_filter_context = sws_getContext(width, height, AV_PIX_FMT_GRAY8,
  164.                                            width, height, AV_PIX_FMT_GRAY8,
  165.                                            sws_flags, &sws_f, NULL, NULL);
  166.     sws_freeVec(vec);
  167.  
  168.     vec = sws_getGaussianVec(f->strength, 5.0);
  169.     for (i = 0; i < COLOR_DIFF_COEFF_SIZE; i++) {
  170.         double d;
  171.         int index = i-COLOR_DIFF_COEFF_SIZE/2 + vec->length/2;
  172.  
  173.         if (index < 0 || index >= vec->length) d = 0.0;
  174.         else                                   d = vec->coeff[index];
  175.  
  176.         f->color_diff_coeff[i] = (int)(d/vec->coeff[vec->length/2]*(1<<12) + 0.5);
  177.     }
  178.     sws_freeVec(vec);
  179.  
  180.     vec = sws_getGaussianVec(f->radius, f->quality);
  181.     f->dist_width    = vec->length;
  182.     f->dist_linesize = FFALIGN(vec->length, 8);
  183.     f->dist_coeff    = av_malloc(f->dist_width * f->dist_linesize * sizeof(*f->dist_coeff));
  184.     if (!f->dist_coeff) {
  185.         sws_freeVec(vec);
  186.         return AVERROR(ENOMEM);
  187.     }
  188.  
  189.     for (y = 0; y < vec->length; y++) {
  190.         for (x = 0; x < vec->length; x++) {
  191.             double d = vec->coeff[x] * vec->coeff[y];
  192.             f->dist_coeff[x + y*f->dist_linesize] = (int)(d*(1<<10) + 0.5);
  193.         }
  194.     }
  195.     sws_freeVec(vec);
  196.  
  197.     return 0;
  198. }
  199.  
  200. static int config_props(AVFilterLink *inlink)
  201. {
  202.     SabContext *sab = inlink->dst->priv;
  203.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
  204.     int ret;
  205.  
  206.     sab->hsub = desc->log2_chroma_w;
  207.     sab->vsub = desc->log2_chroma_h;
  208.  
  209.     close_filter_param(&sab->luma);
  210.     ret = open_filter_param(&sab->luma, inlink->w, inlink->h, sab->sws_flags);
  211.     if (ret < 0)
  212.         return ret;
  213.  
  214.     close_filter_param(&sab->chroma);
  215.     ret = open_filter_param(&sab->chroma,
  216.                             FF_CEIL_RSHIFT(inlink->w, sab->hsub),
  217.                             FF_CEIL_RSHIFT(inlink->h, sab->vsub), sab->sws_flags);
  218.     return ret;
  219. }
  220.  
  221. #define NB_PLANES 4
  222.  
  223. static void blur(uint8_t       *dst, const int dst_linesize,
  224.                  const uint8_t *src, const int src_linesize,
  225.                  const int w, const int h, FilterParam *fp)
  226. {
  227.     int x, y;
  228.     FilterParam f = *fp;
  229.     const int radius = f.dist_width/2;
  230.  
  231.     const uint8_t * const src2[NB_PLANES] = { src };
  232.     int          src2_linesize[NB_PLANES] = { src_linesize };
  233.     uint8_t     *dst2[NB_PLANES] = { f.pre_filter_buf };
  234.     int dst2_linesize[NB_PLANES] = { f.pre_filter_linesize };
  235.  
  236.     sws_scale(f.pre_filter_context, src2, src2_linesize, 0, h, dst2, dst2_linesize);
  237.  
  238. #define UPDATE_FACTOR do {                                              \
  239.         int factor;                                                     \
  240.         factor = f.color_diff_coeff[COLOR_DIFF_COEFF_SIZE/2 + pre_val - \
  241.                  f.pre_filter_buf[ix + iy*f.pre_filter_linesize]] * f.dist_coeff[dx + dy*f.dist_linesize]; \
  242.         sum += src[ix + iy*src_linesize] * factor;                      \
  243.         div += factor;                                                  \
  244.     } while (0)
  245.  
  246.     for (y = 0; y < h; y++) {
  247.         for (x = 0; x < w; x++) {
  248.             int sum = 0;
  249.             int div = 0;
  250.             int dy;
  251.             const int pre_val = f.pre_filter_buf[x + y*f.pre_filter_linesize];
  252.             if (x >= radius && x < w - radius) {
  253.                 for (dy = 0; dy < radius*2 + 1; dy++) {
  254.                     int dx;
  255.                     int iy = y+dy - radius;
  256.                     if      (iy < 0)  iy = -iy;
  257.                     else if (iy >= h) iy = h+h-iy-1;
  258.  
  259.                     for (dx = 0; dx < radius*2 + 1; dx++) {
  260.                         const int ix = x+dx - radius;
  261.                         UPDATE_FACTOR;
  262.                     }
  263.                 }
  264.             } else {
  265.                 for (dy = 0; dy < radius*2+1; dy++) {
  266.                     int dx;
  267.                     int iy = y+dy - radius;
  268.                     if      (iy <  0) iy = -iy;
  269.                     else if (iy >= h) iy = h+h-iy-1;
  270.  
  271.                     for (dx = 0; dx < radius*2 + 1; dx++) {
  272.                         int ix = x+dx - radius;
  273.                         if      (ix < 0)  ix = -ix;
  274.                         else if (ix >= w) ix = w+w-ix-1;
  275.                         UPDATE_FACTOR;
  276.                     }
  277.                 }
  278.             }
  279.             dst[x + y*dst_linesize] = (sum + div/2) / div;
  280.         }
  281.     }
  282. }
  283.  
  284. static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
  285. {
  286.     SabContext  *sab = inlink->dst->priv;
  287.     AVFilterLink *outlink = inlink->dst->outputs[0];
  288.     AVFrame *outpic;
  289.  
  290.     outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  291.     if (!outpic) {
  292.         av_frame_free(&inpic);
  293.         return AVERROR(ENOMEM);
  294.     }
  295.     av_frame_copy_props(outpic, inpic);
  296.  
  297.     blur(outpic->data[0], outpic->linesize[0], inpic->data[0],  inpic->linesize[0],
  298.          inlink->w, inlink->h, &sab->luma);
  299.     if (inpic->data[2]) {
  300.         int cw = FF_CEIL_RSHIFT(inlink->w, sab->hsub);
  301.         int ch = FF_CEIL_RSHIFT(inlink->h, sab->vsub);
  302.         blur(outpic->data[1], outpic->linesize[1], inpic->data[1], inpic->linesize[1], cw, ch, &sab->chroma);
  303.         blur(outpic->data[2], outpic->linesize[2], inpic->data[2], inpic->linesize[2], cw, ch, &sab->chroma);
  304.     }
  305.  
  306.     av_frame_free(&inpic);
  307.     return ff_filter_frame(outlink, outpic);
  308. }
  309.  
  310. static const AVFilterPad sab_inputs[] = {
  311.     {
  312.         .name         = "default",
  313.         .type         = AVMEDIA_TYPE_VIDEO,
  314.         .filter_frame = filter_frame,
  315.         .config_props = config_props,
  316.     },
  317.     { NULL }
  318. };
  319.  
  320. static const AVFilterPad sab_outputs[] = {
  321.     {
  322.         .name = "default",
  323.         .type = AVMEDIA_TYPE_VIDEO,
  324.     },
  325.     { NULL }
  326. };
  327.  
  328. AVFilter avfilter_vf_sab = {
  329.     .name          = "sab",
  330.     .description   = NULL_IF_CONFIG_SMALL("Apply shape adaptive blur."),
  331.     .priv_size     = sizeof(SabContext),
  332.     .init          = init,
  333.     .uninit        = uninit,
  334.     .query_formats = query_formats,
  335.     .inputs        = sab_inputs,
  336.     .outputs       = sab_outputs,
  337.     .priv_class    = &sab_class,
  338.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
  339. };
  340.