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  1. /*
  2.  * Copyright (c) 2015 Niklas Haas
  3.  * Copyright (c) 2015 Paul B Mahol
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a copy
  6.  * of this software and associated documentation files (the "Software"), to deal
  7.  * in the Software without restriction, including without limitation the rights
  8.  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  9.  * copies of the Software, and to permit persons to whom the Software is
  10.  * furnished to do so, subject to the following conditions:
  11.  *
  12.  * The above copyright notice and this permission notice shall be included in
  13.  * all copies or substantial portions of the Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18.  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20.  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21.  * SOFTWARE.
  22.  */
  23.  
  24. #include "libavutil/opt.h"
  25. #include "libavutil/pixdesc.h"
  26. #include "avfilter.h"
  27. #include "internal.h"
  28. #include "video.h"
  29.  
  30. typedef struct DebandContext {
  31.     const AVClass *class;
  32.  
  33.     float threshold[4];
  34.     int range;
  35.     int blur;
  36.     float direction;
  37.  
  38.     int nb_components;
  39.     int planewidth[4];
  40.     int planeheight[4];
  41.     int thr[4];
  42.  
  43.     int *x_pos;
  44.     int *y_pos;
  45.  
  46.     int (*deband)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
  47. } DebandContext;
  48.  
  49. #define OFFSET(x) offsetof(DebandContext, x)
  50. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
  51.  
  52. static const AVOption deband_options[] = {
  53.     { "1thr",      "set 1st plane threshold", OFFSET(threshold[0]), AV_OPT_TYPE_FLOAT, {.dbl=0.02},  0.00003,     0.5, FLAGS },
  54.     { "2thr",      "set 2nd plane threshold", OFFSET(threshold[1]), AV_OPT_TYPE_FLOAT, {.dbl=0.02},  0.00003,     0.5, FLAGS },
  55.     { "3thr",      "set 3rd plane threshold", OFFSET(threshold[2]), AV_OPT_TYPE_FLOAT, {.dbl=0.02},  0.00003,     0.5, FLAGS },
  56.     { "4thr",      "set 4th plane threshold", OFFSET(threshold[3]), AV_OPT_TYPE_FLOAT, {.dbl=0.02},  0.00003,     0.5, FLAGS },
  57.     { "range",     "set range",               OFFSET(range),        AV_OPT_TYPE_INT,   {.i64=16},    INT_MIN, INT_MAX, FLAGS },
  58.     { "r",         "set range",               OFFSET(range),        AV_OPT_TYPE_INT,   {.i64=16},    INT_MIN, INT_MAX, FLAGS },
  59.     { "direction", "set direction",           OFFSET(direction),    AV_OPT_TYPE_FLOAT, {.dbl=2*M_PI},-2*M_PI,  2*M_PI, FLAGS },
  60.     { "d",         "set direction",           OFFSET(direction),    AV_OPT_TYPE_FLOAT, {.dbl=2*M_PI},-2*M_PI,  2*M_PI, FLAGS },
  61.     { "blur",      "enable blur",             OFFSET(blur),         AV_OPT_TYPE_INT,   {.i64=1},           0,       1, FLAGS },
  62.     { NULL }
  63. };
  64.  
  65. AVFILTER_DEFINE_CLASS(deband);
  66.  
  67. static int query_formats(AVFilterContext *ctx)
  68. {
  69.     static const enum AVPixelFormat pix_fmts[] = {
  70.         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
  71.         AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,
  72.         AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUV440P,
  73.         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
  74.         AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ440P,
  75.         AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
  76.         AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
  77.         AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
  78.         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
  79.         AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
  80.         AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
  81.         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
  82.         AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
  83.         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14,
  84.         AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16,
  85.         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
  86.         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
  87.         AV_PIX_FMT_NONE
  88.     };
  89.     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
  90.     if (!fmts_list)
  91.         return AVERROR(ENOMEM);
  92.  
  93.     return ff_set_common_formats(ctx, fmts_list);
  94. }
  95.  
  96. static float frand(int x, int y)
  97. {
  98.     const float r = sinf(x * 12.9898 + y * 78.233) * 43758.545;
  99.  
  100.     return r - floorf(r);
  101. }
  102.  
  103. static int inline get_avg(int ref0, int ref1, int ref2, int ref3)
  104. {
  105.     return (ref0 + ref1 + ref2 + ref3) / 4;
  106. }
  107.  
  108. typedef struct ThreadData {
  109.     AVFrame *in, *out;
  110. } ThreadData;
  111.  
  112. static int deband_8_c(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
  113. {
  114.     DebandContext *s = ctx->priv;
  115.     ThreadData *td = arg;
  116.     AVFrame *in = td->in;
  117.     AVFrame *out = td->out;
  118.     int x, y, p;
  119.  
  120.     for (p = 0; p < s->nb_components; p++) {
  121.         const uint8_t *src_ptr = (const uint8_t *)in->data[p];
  122.         uint8_t *dst_ptr = (uint8_t *)out->data[p];
  123.         const int dst_linesize = out->linesize[p];
  124.         const int src_linesize = in->linesize[p];
  125.         const int thr = s->thr[p];
  126.         const int start = (s->planeheight[p] *  jobnr   ) / nb_jobs;
  127.         const int end   = (s->planeheight[p] * (jobnr+1)) / nb_jobs;
  128.         const int w = s->planewidth[p] - 1;
  129.         const int h = s->planeheight[p] - 1;
  130.  
  131.         for (y = start; y < end; y++) {
  132.             const int pos = y * s->planeheight[0];
  133.  
  134.             for (x = 0; x < s->planewidth[p]; x++) {
  135.                 const int x_pos = s->x_pos[pos + x];
  136.                 const int y_pos = s->y_pos[pos + x];
  137.                 const int ref0 = src_ptr[av_clip(y +  y_pos, 0, h) * src_linesize + av_clip(x +  x_pos, 0, w)];
  138.                 const int ref1 = src_ptr[av_clip(y + -y_pos, 0, h) * src_linesize + av_clip(x +  x_pos, 0, w)];
  139.                 const int ref2 = src_ptr[av_clip(y + -y_pos, 0, h) * src_linesize + av_clip(x + -x_pos, 0, w)];
  140.                 const int ref3 = src_ptr[av_clip(y +  y_pos, 0, h) * src_linesize + av_clip(x + -x_pos, 0, w)];
  141.                 const int src0 = src_ptr[y * src_linesize + x];
  142.  
  143.                 if (s->blur) {
  144.                     const int avg = get_avg(ref0, ref1, ref2, ref3);
  145.                     const int diff = FFABS(src0 - avg);
  146.  
  147.                     dst_ptr[y * dst_linesize + x] = diff < thr ? avg : src0;
  148.                 } else {
  149.                     dst_ptr[y * dst_linesize + x] = (FFABS(src0 - ref0) < thr) &&
  150.                                                     (FFABS(src0 - ref1) < thr) &&
  151.                                                     (FFABS(src0 - ref2) < thr) &&
  152.                                                     (FFABS(src0 - ref3) < thr) ? get_avg(ref0, ref1, ref2, ref3) : src0;
  153.                 }
  154.             }
  155.         }
  156.     }
  157.  
  158.     return 0;
  159. }
  160.  
  161. static int deband_16_c(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
  162. {
  163.     DebandContext *s = ctx->priv;
  164.     ThreadData *td = arg;
  165.     AVFrame *in = td->in;
  166.     AVFrame *out = td->out;
  167.     int x, y, p;
  168.  
  169.     for (p = 0; p < s->nb_components; p++) {
  170.         const uint16_t *src_ptr = (const uint16_t *)in->data[p];
  171.         uint16_t *dst_ptr = (uint16_t *)out->data[p];
  172.         const int dst_linesize = out->linesize[p] / 2;
  173.         const int src_linesize = in->linesize[p] / 2;
  174.         const int thr = s->thr[p];
  175.         const int start = (s->planeheight[p] *  jobnr   ) / nb_jobs;
  176.         const int end   = (s->planeheight[p] * (jobnr+1)) / nb_jobs;
  177.         const int w = s->planewidth[p] - 1;
  178.         const int h = s->planeheight[p] - 1;
  179.  
  180.         for (y = start; y < end; y++) {
  181.             const int pos = y * s->planeheight[0];
  182.  
  183.             for (x = 0; x < s->planewidth[p]; x++) {
  184.                 const int x_pos = s->x_pos[pos + x];
  185.                 const int y_pos = s->y_pos[pos + x];
  186.                 const int ref0 = src_ptr[av_clip(y +  y_pos, 0, h) * src_linesize + av_clip(x +  x_pos, 0, w)];
  187.                 const int ref1 = src_ptr[av_clip(y + -y_pos, 0, h) * src_linesize + av_clip(x +  x_pos, 0, w)];
  188.                 const int ref2 = src_ptr[av_clip(y + -y_pos, 0, h) * src_linesize + av_clip(x + -x_pos, 0, w)];
  189.                 const int ref3 = src_ptr[av_clip(y +  y_pos, 0, h) * src_linesize + av_clip(x + -x_pos, 0, w)];
  190.                 const int src0 = src_ptr[y * src_linesize + x];
  191.  
  192.                 if (s->blur) {
  193.                     const int avg = get_avg(ref0, ref1, ref2, ref3);
  194.                     const int diff = FFABS(src0 - avg);
  195.  
  196.                     dst_ptr[y * dst_linesize + x] = diff < thr ? avg : src0;
  197.                 } else {
  198.                     dst_ptr[y * dst_linesize + x] = (FFABS(src0 - ref0) < thr) &&
  199.                                                     (FFABS(src0 - ref1) < thr) &&
  200.                                                     (FFABS(src0 - ref2) < thr) &&
  201.                                                     (FFABS(src0 - ref3) < thr) ? get_avg(ref0, ref1, ref2, ref3) : src0;
  202.                 }
  203.             }
  204.         }
  205.     }
  206.  
  207.     return 0;
  208. }
  209.  
  210. static int config_input(AVFilterLink *inlink)
  211. {
  212.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
  213.     AVFilterContext *ctx = inlink->dst;
  214.     DebandContext *s = ctx->priv;
  215.     const float direction = s->direction;
  216.     const int range = s->range;
  217.     int x, y;
  218.  
  219.     s->nb_components = desc->nb_components;
  220.  
  221.     s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
  222.     s->planeheight[0] = s->planeheight[3] = inlink->h;
  223.     s->planewidth[1]  = s->planewidth[2]  = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
  224.     s->planewidth[0]  = s->planewidth[3]  = inlink->w;
  225.  
  226.     s->deband = desc->comp[0].depth_minus1 > 7 ? deband_16_c : deband_8_c;
  227.  
  228.     s->thr[0] = ((1 << (desc->comp[0].depth_minus1 + 1)) - 1) * s->threshold[0];
  229.     s->thr[1] = ((1 << (desc->comp[1].depth_minus1 + 1)) - 1) * s->threshold[1];
  230.     s->thr[2] = ((1 << (desc->comp[2].depth_minus1 + 1)) - 1) * s->threshold[2];
  231.     s->thr[3] = ((1 << (desc->comp[3].depth_minus1 + 1)) - 1) * s->threshold[3];
  232.  
  233.     s->x_pos = av_malloc(s->planewidth[0] * s->planeheight[0] * sizeof(*s->x_pos));
  234.     s->y_pos = av_malloc(s->planewidth[0] * s->planeheight[0] * sizeof(*s->y_pos));
  235.     if (!s->x_pos || !s->y_pos)
  236.         return AVERROR(ENOMEM);
  237.  
  238.     for (y = 0; y < s->planeheight[0]; y++) {
  239.         for (x = 0; x < s->planewidth[0]; x++) {
  240.             const float r = frand(x, y);
  241.             const float dir = direction < 0 ? -direction : r * direction;
  242.             const int dist = range < 0 ? -range : r * range;
  243.  
  244.             s->x_pos[y * s->planeheight[0] + x] = cosf(dir) * dist;
  245.             s->y_pos[y * s->planeheight[0] + x] = sinf(dir) * dist;
  246.         }
  247.     }
  248.  
  249.     return 0;
  250. }
  251.  
  252. static int filter_frame(AVFilterLink *inlink, AVFrame *in)
  253. {
  254.     AVFilterContext *ctx = inlink->dst;
  255.     AVFilterLink *outlink = ctx->outputs[0];
  256.     DebandContext *s = ctx->priv;
  257.     AVFrame *out;
  258.     ThreadData td;
  259.  
  260.     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  261.     if (!out) {
  262.         av_frame_free(&in);
  263.         return AVERROR(ENOMEM);
  264.     }
  265.     av_frame_copy_props(out, in);
  266.  
  267.     td.in = in; td.out = out;
  268.     ctx->internal->execute(ctx, s->deband, &td, NULL, FFMIN3(s->planeheight[1],
  269.                                                              s->planeheight[2],
  270.                                                              ctx->graph->nb_threads));
  271.  
  272.     av_frame_free(&in);
  273.     return ff_filter_frame(outlink, out);
  274. }
  275.  
  276. static av_cold void uninit(AVFilterContext *ctx)
  277. {
  278.     DebandContext *s = ctx->priv;
  279.  
  280.     av_freep(&s->x_pos);
  281.     av_freep(&s->y_pos);
  282. }
  283.  
  284. static const AVFilterPad avfilter_vf_deband_inputs[] = {
  285.     {
  286.         .name         = "default",
  287.         .type         = AVMEDIA_TYPE_VIDEO,
  288.         .config_props = config_input,
  289.         .filter_frame = filter_frame,
  290.     },
  291.     { NULL }
  292. };
  293.  
  294. static const AVFilterPad avfilter_vf_deband_outputs[] = {
  295.     {
  296.         .name = "default",
  297.         .type = AVMEDIA_TYPE_VIDEO,
  298.     },
  299.     { NULL }
  300. };
  301.  
  302. AVFilter ff_vf_deband = {
  303.     .name          = "deband",
  304.     .description   = NULL_IF_CONFIG_SMALL("Debands video."),
  305.     .priv_size     = sizeof(DebandContext),
  306.     .priv_class    = &deband_class,
  307.     .uninit        = uninit,
  308.     .query_formats = query_formats,
  309.     .inputs        = avfilter_vf_deband_inputs,
  310.     .outputs       = avfilter_vf_deband_outputs,
  311.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
  312. };
  313.