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/*

 * Copyright (c) 2002 Michael Niedermayer 

 * Copyright (c) 2011 Stefano Sabatini

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 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 General Public License for more details.

 *

 * You should have received a copy of the GNU 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.

 */

/**

 * @file

 * Apply a boxblur filter to the input video.

 * Ported from MPlayer libmpcodecs/vf_boxblur.c.

 */

#include "libavutil/avstring.h"

#include "libavutil/common.h"

#include "libavutil/eval.h"

#include "libavutil/opt.h"

#include "libavutil/pixdesc.h"

#include "avfilter.h"

#include "formats.h"

#include "internal.h"

#include "video.h"

static const char *const var_names[] = {

    "w",

    "h",

    "cw",

    "ch",

    "hsub",

    "vsub",

    NULL

};

enum var_name {

    VAR_W,

    VAR_H,

    VAR_CW,

    VAR_CH,

    VAR_HSUB,

    VAR_VSUB,

    VARS_NB

};

typedef struct {

    int radius;

    int power;

    char *radius_expr;

} FilterParam;

typedef struct {

    const AVClass *class;

    FilterParam luma_param;

    FilterParam chroma_param;

    FilterParam alpha_param;

    int hsub, vsub;

    int radius[4];

    int power[4];

    uint8_t *temp[2]; ///< temporary buffer used in blur_power()

} BoxBlurContext;

#define Y 0

#define U 1

#define V 2

#define A 3

static av_cold int init(AVFilterContext *ctx)

{

    BoxBlurContext *s = ctx->priv;

    if (!s->luma_param.radius_expr) {

        av_log(ctx, AV_LOG_ERROR, "Luma radius expression is not set.\n");

        return AVERROR(EINVAL);

    }

    /* fill missing params */

    if (!s->chroma_param.radius_expr) {

        s->chroma_param.radius_expr = av_strdup(s->luma_param.radius_expr);

        if (!s->chroma_param.radius_expr)

            return AVERROR(ENOMEM);

    }

    if (s->chroma_param.power < 0)

        s->chroma_param.power = s->luma_param.power;

    if (!s->alpha_param.radius_expr) {

        s->alpha_param.radius_expr = av_strdup(s->luma_param.radius_expr);

        if (!s->alpha_param.radius_expr)

            return AVERROR(ENOMEM);

    }

    if (s->alpha_param.power < 0)

        s->alpha_param.power = s->luma_param.power;

    return 0;

}

static av_cold void uninit(AVFilterContext *ctx)

{

    BoxBlurContext *s = ctx->priv;

    av_freep(&s->temp[0]);

    av_freep(&s->temp[1]);

}

static int query_formats(AVFilterContext *ctx)

{

    static const enum AVPixelFormat pix_fmts[] = {

        AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,

        AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUVA420P,

        AV_PIX_FMT_YUV440P,  AV_PIX_FMT_GRAY8,

        AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,

        AV_PIX_FMT_YUVJ440P,

        AV_PIX_FMT_NONE

    };

    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

    return 0;

}

static int config_input(AVFilterLink *inlink)

{

    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

    AVFilterContext    *ctx = inlink->dst;

    BoxBlurContext *s = ctx->priv;

    int w = inlink->w, h = inlink->h;

    int cw, ch;

    double var_values[VARS_NB], res;

    char *expr;

    int ret;

    if (!(s->temp[0] = av_malloc(FFMAX(w, h))) ||

        !(s->temp[1] = av_malloc(FFMAX(w, h))))

        return AVERROR(ENOMEM);

    s->hsub = desc->log2_chroma_w;

    s->vsub = desc->log2_chroma_h;

    var_values[VAR_W]       = inlink->w;

    var_values[VAR_H]       = inlink->h;

    var_values[VAR_CW] = cw = w>>s->hsub;

    var_values[VAR_CH] = ch = h>>s->vsub;

    var_values[VAR_HSUB]    = 1<hsub;

    var_values[VAR_VSUB]    = 1<vsub;

#define EVAL_RADIUS_EXPR(comp)                                          \

    expr = s->comp##_param.radius_expr;                                 \

    ret = av_expr_parse_and_eval(&res, expr, var_names, var_values,     \

                                 NULL, NULL, NULL, NULL, NULL, 0, ctx); \

    s->comp##_param.radius = res;                                       \

    if (ret < 0) {                                                      \

        av_log(NULL, AV_LOG_ERROR,                                      \

               "Error when evaluating " #comp " radius expression '%s'\n", expr); \

        return ret;                                                     \

    }

    EVAL_RADIUS_EXPR(luma);

    EVAL_RADIUS_EXPR(chroma);

    EVAL_RADIUS_EXPR(alpha);

    av_log(ctx, AV_LOG_VERBOSE,

           "luma_radius:%d luma_power:%d "

           "chroma_radius:%d chroma_power:%d "

           "alpha_radius:%d alpha_power:%d "

           "w:%d chroma_w:%d h:%d chroma_h:%d\n",

           s->luma_param  .radius, s->luma_param  .power,

           s->chroma_param.radius, s->chroma_param.power,

           s->alpha_param .radius, s->alpha_param .power,

           w, cw, h, ch);

#define CHECK_RADIUS_VAL(w_, h_, comp)                                  \

    if (s->comp##_param.radius < 0 ||                                   \

        2*s->comp##_param.radius > FFMIN(w_, h_)) {                     \

        av_log(ctx, AV_LOG_ERROR,                                       \

               "Invalid " #comp " radius value %d, must be >= 0 and <= %d\n", \

               s->comp##_param.radius, FFMIN(w_, h_)/2);                \

        return AVERROR(EINVAL);                                         \

    }

    CHECK_RADIUS_VAL(w,  h,  luma);

    CHECK_RADIUS_VAL(cw, ch, chroma);

    CHECK_RADIUS_VAL(w,  h,  alpha);

    s->radius[Y] = s->luma_param.radius;

    s->radius[U] = s->radius[V] = s->chroma_param.radius;

    s->radius[A] = s->alpha_param.radius;

    s->power[Y] = s->luma_param.power;

    s->power[U] = s->power[V] = s->chroma_param.power;

    s->power[A] = s->alpha_param.power;

    return 0;

}

static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,

                        int len, int radius)

{

    /* Naive boxblur would sum source pixels from x-radius .. x+radius

     * for destination pixel x. That would be O(radius*width).

     * If you now look at what source pixels represent 2 consecutive

     * output pixels, then you see they are almost identical and only

     * differ by 2 pixels, like:

     * src0       111111111

     * dst0           1

     * src1        111111111

     * dst1            1

     * src0-src1  1       -1

     * so when you know one output pixel you can find the next by just adding

     * and subtracting 1 input pixel.

     * The following code adopts this faster variant.

     */

    const int length = radius*2 + 1;

    const int inv = ((1<<16) + length/2)/length;

    int x, sum = 0;

    for (x = 0; x < radius; x++)

        sum += src[x*src_step]<<1;

    sum += src[radius*src_step];

    for (x = 0; x <= radius; x++) {

        sum += src[(radius+x)*src_step] - src[(radius-x)*src_step];

        dst[x*dst_step] = (sum*inv + (1<<15))>>16;

    }

    for (; x < len-radius; x++) {

        sum += src[(radius+x)*src_step] - src[(x-radius-1)*src_step];

        dst[x*dst_step] = (sum*inv + (1<<15))>>16;

    }

    for (; x < len; x++) {

        sum += src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step];

        dst[x*dst_step] = (sum*inv + (1<<15))>>16;

    }

}

static inline void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,

                              int len, int radius, int power, uint8_t *temp[2])

{

    uint8_t *a = temp[0], *b = temp[1];

    if (radius && power) {

        blur(a, 1, src, src_step, len, radius);

        for (; power > 2; power--) {

            uint8_t *c;

            blur(b, 1, a, 1, len, radius);

            c = a; a = b; b = c;

        }

        if (power > 1) {

            blur(dst, dst_step, a, 1, len, radius);

        } else {

            int i;

            for (i = 0; i < len; i++)

                dst[i*dst_step] = a[i];

        }

    } else {

        int i;

        for (i = 0; i < len; i++)

            dst[i*dst_step] = src[i*src_step];

    }

}

static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,

                  int w, int h, int radius, int power, uint8_t *temp[2])

{

    int y;

    if (radius == 0 && dst == src)

        return;

    for (y = 0; y < h; y++)

        blur_power(dst + y*dst_linesize, 1, src + y*src_linesize, 1,

                   w, radius, power, temp);

}

static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,

                  int w, int h, int radius, int power, uint8_t *temp[2])

{

    int x;

    if (radius == 0 && dst == src)

        return;

    for (x = 0; x < w; x++)

        blur_power(dst + x, dst_linesize, src + x, src_linesize,

                   h, radius, power, temp);

}

static int filter_frame(AVFilterLink *inlink, AVFrame *in)

{

    AVFilterContext *ctx = inlink->dst;

    BoxBlurContext *s = ctx->priv;

    AVFilterLink *outlink = inlink->dst->outputs[0];

    AVFrame *out;

    int plane;

    int cw = FF_CEIL_RSHIFT(inlink->w, s->hsub), ch = FF_CEIL_RSHIFT(in->height, s->vsub);

    int w[4] = { inlink->w, cw, cw, inlink->w };

    int h[4] = { in->height, ch, ch, in->height };

    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

    if (!out) {

        av_frame_free(&in);

        return AVERROR(ENOMEM);

    }

    av_frame_copy_props(out, in);

    for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++)

        hblur(out->data[plane], out->linesize[plane],

              in ->data[plane], in ->linesize[plane],

              w[plane], h[plane], s->radius[plane], s->power[plane],

              s->temp);

    for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++)

        vblur(out->data[plane], out->linesize[plane],

              out->data[plane], out->linesize[plane],

              w[plane], h[plane], s->radius[plane], s->power[plane],

              s->temp);

    av_frame_free(&in);

    return ff_filter_frame(outlink, out);

}

#define OFFSET(x) offsetof(BoxBlurContext, x)

#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

static const AVOption boxblur_options[] = {

    { "luma_radius", "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },

    { "lr",          "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },

    { "luma_power",  "How many times should the boxblur be applied to luma",  OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS },

    { "lp",          "How many times should the boxblur be applied to luma",  OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS },

    { "chroma_radius", "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

    { "cr",            "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

    { "chroma_power",  "How many times should the boxblur be applied to chroma",  OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },

    { "cp",            "How many times should the boxblur be applied to chroma",  OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },

    { "alpha_radius", "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

    { "ar",           "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

    { "alpha_power",  "How many times should the boxblur be applied to alpha",  OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },

    { "ap",           "How many times should the boxblur be applied to alpha",  OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },

    { NULL }

};

AVFILTER_DEFINE_CLASS(boxblur);

static const AVFilterPad avfilter_vf_boxblur_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .config_props = config_input,

        .filter_frame = filter_frame,

    },

    { NULL }

};

static const AVFilterPad avfilter_vf_boxblur_outputs[] = {

    {

        .name = "default",

        .type = AVMEDIA_TYPE_VIDEO,

    },

    { NULL }

};

AVFilter avfilter_vf_boxblur = {

    .name          = "boxblur",

    .description   = NULL_IF_CONFIG_SMALL("Blur the input."),

    .priv_size     = sizeof(BoxBlurContext),

    .priv_class    = &boxblur_class,

    .init          = init,

    .uninit        = uninit,

    .query_formats = query_formats,

    .inputs        = avfilter_vf_boxblur_inputs,

    .outputs       = avfilter_vf_boxblur_outputs,

    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

};