/* * Copyright (c) 2021 Paul B Mahol * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/imgutils.h"#include "libavutil/pixdesc.h"#include "libavutil/opt.h"#include "avfilter.h"#include "formats.h"#include "internal.h"#include "video.h"#include "framesync.h" typedef struct ThreadData {    AVFrame *filtered, *source, *reference, *dst;} ThreadData; typedef struct LimitDiffContext {    const AVClass *class;     float threshold;    float elasticity;    int reference;    int planes;     int thr1, thr2;     int linesize[4];    int planewidth[4], planeheight[4];    int nb_planes;    int depth;    FFFrameSync fs;     void (*limitdiff)(const uint8_t *filtered, uint8_t *dst,                      const uint8_t *source, const uint8_t *reference,                      int thr1, int thr2, int w, int depth);} LimitDiffContext; #define OFFSET(x) offsetof(LimitDiffContext, x)#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption limitdiff_options[] = {    { "threshold",  "set the threshold",        OFFSET(threshold),  AV_OPT_TYPE_FLOAT, {.dbl=1/255.f}, 0,   1, TFLAGS },    { "elasticity", "set the elasticity",       OFFSET(elasticity), AV_OPT_TYPE_FLOAT, {.dbl=2.f},     0,  10, TFLAGS },    { "reference",  "enable reference stream",  OFFSET(reference),  AV_OPT_TYPE_BOOL,  {.i64=0},       0,   1,  FLAGS },    { "planes",     "set the planes to filter", OFFSET(planes),     AV_OPT_TYPE_INT,   {.i64=0xF},     0, 0xF, TFLAGS },    { NULL }}; static const enum AVPixelFormat pix_fmts[] = {    AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,    AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,    AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,    AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,    AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,    AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,    AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,    AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,    AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,    AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,    AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,    AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,    AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,    AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,    AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,    AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,    AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,    AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,    AV_PIX_FMT_NONE}; static void limitdiff8(const uint8_t *filtered, uint8_t *dst,                       const uint8_t *source, const uint8_t *reference,                       int thr1, int thr2, int w, int depth){    for (int x = 0; x < w; x++) {        const int diff = filtered[x] - source[x];        const int diff_ref = FFABS(filtered[x] - reference[x]);         if (diff_ref <= thr1)            dst[x] = filtered[x];        else if (diff_ref >= thr2)            dst[x] = source[x];        else            dst[x] = av_clip_uint8(source[x] + diff * (thr2 - diff_ref) / (thr2 - thr1));    }} static void limitdiff16(const uint8_t *ffiltered, uint8_t *ddst,                        const uint8_t *ssource, const uint8_t *rreference,                        int thr1, int thr2, int w, int depth){    const uint16_t *source = (const uint16_t *)ssource;    const uint16_t *filtered = (const uint16_t *)ffiltered;    const uint16_t *reference = (const uint16_t *)rreference;    uint16_t *dst = (uint16_t *)ddst;     for (int x = 0; x < w; x++) {        const int diff = filtered[x] - source[x];        const int diff_ref = FFABS(filtered[x] - reference[x]);         if (diff_ref <= thr1)            dst[x] = filtered[x];        else if (diff_ref >= thr2)            dst[x] = source[x];        else            dst[x] = av_clip_uintp2_c(source[x] + diff * (thr2 - diff_ref) / (thr2 - thr1), depth);    }} static int config_input(AVFilterLink *inlink){    AVFilterContext *ctx = inlink->dst;    LimitDiffContext *s = ctx->priv;    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);    int vsub, hsub, ret;     s->nb_planes = av_pix_fmt_count_planes(inlink->format);     if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)        return ret;     hsub = desc->log2_chroma_w;    vsub = desc->log2_chroma_h;    s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, vsub);    s->planeheight[0] = s->planeheight[3] = inlink->h;    s->planewidth[1]  = s->planewidth[2]  = AV_CEIL_RSHIFT(inlink->w, hsub);    s->planewidth[0]  = s->planewidth[3]  = inlink->w;     s->depth = desc->comp[0].depth;    s->thr1 = s->threshold * ((1 << s->depth) - 1);    s->thr2 = s->thr1 * s->elasticity;     if (desc->comp[0].depth == 8)        s->limitdiff = limitdiff8;    else        s->limitdiff = limitdiff16;     return 0;} static int limitdiff_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs){    LimitDiffContext *s = ctx->priv;    const int depth  = s->depth;    ThreadData *td = arg;     for (int p = 0; p < s->nb_planes; p++) {        const ptrdiff_t filtered_linesize = td->filtered->linesize[p];        const ptrdiff_t source_linesize = td->source->linesize[p];        const ptrdiff_t reference_linesize = td->reference->linesize[p];        const ptrdiff_t dst_linesize = td->dst->linesize[p];        const int thr1 = s->thr1;        const int thr2 = s->thr2;        const int w = s->planewidth[p];        const int h = s->planeheight[p];        const int slice_start = (h * jobnr) / nb_jobs;        const int slice_end = (h * (jobnr+1)) / nb_jobs;        const uint8_t *filtered = td->filtered->data[p] + slice_start * filtered_linesize;        const uint8_t *source = td->source->data[p] + slice_start * source_linesize;        const uint8_t *reference = td->reference->data[p] + slice_start * reference_linesize;        uint8_t *dst = td->dst->data[p] + slice_start * dst_linesize;         if (!((1 << p) & s->planes)) {            av_image_copy_plane(dst, dst_linesize, filtered, filtered_linesize,                                s->linesize[p], slice_end - slice_start);            continue;        }         for (int y = slice_start; y < slice_end; y++) {            s->limitdiff(filtered, dst, source, reference, thr1, thr2, w, depth);             dst += dst_linesize;            filtered += filtered_linesize;            source  += source_linesize;            reference  += reference_linesize;        }    }     return 0;} static int process_frame(FFFrameSync *fs){    AVFilterContext *ctx = fs->parent;    LimitDiffContext *s = fs->opaque;    AVFilterLink *outlink = ctx->outputs[0];    AVFrame *out, *filtered, *source, *reference = NULL;    int ret;     if ((ret = ff_framesync_get_frame(&s->fs, 0, &filtered, 0)) < 0 ||        (ret = ff_framesync_get_frame(&s->fs, 1, &source,   0)) < 0)        return ret;    if (s->reference) {        if ((ret = ff_framesync_get_frame(&s->fs, 2, &reference,  0)) < 0)            return ret;    }     if (ctx->is_disabled) {        out = av_frame_clone(filtered);        if (!out)            return AVERROR(ENOMEM);    } else {        ThreadData td;         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);        if (!out)            return AVERROR(ENOMEM);        av_frame_copy_props(out, filtered);         td.filtered = filtered;        td.source = source;        td.reference = reference ? reference : source;        td.dst = out;         ff_filter_execute(ctx, limitdiff_slice, &td, NULL,                          FFMIN(s->planeheight[0], ff_filter_get_nb_threads(ctx)));    }    out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);     return ff_filter_frame(outlink, out);} static int config_output(AVFilterLink *outlink){    AVFilterContext *ctx = outlink->src;    LimitDiffContext *s = ctx->priv;    AVFilterLink *filtered = ctx->inputs[0];    AVFilterLink *source = ctx->inputs[1];    FFFrameSyncIn *in;    int ret;     if (filtered->w != source->w || filtered->h != source->h) {        av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "               "(size %dx%d) do not match the corresponding "               "second input link %s parameters (%dx%d)\n",               ctx->input_pads[0].name, filtered->w, filtered->h,               ctx->input_pads[1].name, source->w, source->h);        return AVERROR(EINVAL);    }     if (s->reference) {        AVFilterLink *reference = ctx->inputs[2];         if (filtered->w != reference->w || filtered->h != reference->h) {            av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "                   "(size %dx%d) do not match the corresponding "                   "third input link %s parameters (%dx%d)\n",                   ctx->input_pads[0].name, filtered->w, filtered->h,                   ctx->input_pads[1].name, reference->w, reference->h);            return AVERROR(EINVAL);        }    }     outlink->w = filtered->w;    outlink->h = filtered->h;    outlink->sample_aspect_ratio = filtered->sample_aspect_ratio;    outlink->frame_rate = filtered->frame_rate;     if ((ret = ff_framesync_init(&s->fs, ctx, 2 + !!s->reference)) < 0)        return ret;     in = s->fs.in;    in[0].time_base = filtered->time_base;    in[1].time_base = source->time_base;    if (s->reference)        in[2].time_base = ctx->inputs[2]->time_base;    in[0].sync   = 1;    in[0].before = EXT_STOP;    in[0].after  = EXT_INFINITY;    in[1].sync   = 1;    in[1].before = EXT_STOP;    in[1].after  = EXT_INFINITY;    if (s->reference) {        in[2].sync   = 1;        in[2].before = EXT_STOP;        in[2].after  = EXT_INFINITY;    }    s->fs.opaque   = s;    s->fs.on_event = process_frame;     ret = ff_framesync_configure(&s->fs);    outlink->time_base = s->fs.time_base;     return ret;} static int activate(AVFilterContext *ctx){    LimitDiffContext *s = ctx->priv;    return ff_framesync_activate(&s->fs);} static av_cold int init(AVFilterContext *ctx){    const LimitDiffContext *s = ctx->priv;    AVFilterPad pad = {        .name         = "filtered",        .type         = AVMEDIA_TYPE_VIDEO,        .config_props = config_input,    };    int ret;     if ((ret = ff_append_inpad(ctx, &pad)) < 0)        return ret;     pad.name = "source";    pad.config_props = NULL;    if ((ret = ff_append_inpad(ctx, &pad)) < 0)        return ret;     if (s->reference) {        pad.name = "reference";        pad.config_props = NULL;        if ((ret = ff_append_inpad(ctx, &pad)) < 0)            return ret;    }     return 0;} static av_cold void uninit(AVFilterContext *ctx){    LimitDiffContext *s = ctx->priv;     ff_framesync_uninit(&s->fs);} static const AVFilterPad limitdiff_outputs[] = {    {        .name          = "default",        .type          = AVMEDIA_TYPE_VIDEO,        .config_props  = config_output,    },}; AVFILTER_DEFINE_CLASS(limitdiff); const AVFilter ff_vf_limitdiff = {    .name          = "limitdiff",    .description   = NULL_IF_CONFIG_SMALL("Apply filtering with limiting difference."),    .priv_class    = &limitdiff_class,    .priv_size     = sizeof(LimitDiffContext),    .init          = init,    .uninit        = uninit,    .activate      = activate,    FILTER_OUTPUTS(limitdiff_outputs),    FILTER_PIXFMTS_ARRAY(pix_fmts),    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |                     AVFILTER_FLAG_SLICE_THREADS |                     AVFILTER_FLAG_DYNAMIC_INPUTS,    .process_command = ff_filter_process_command,};