351 lines
12 KiB
C
351 lines
12 KiB
C
/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2011 Stefano Sabatini
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with Libav; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* Apply a boxblur filter to the input video.
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* Ported from MPlayer libmpcodecs/vf_boxblur.c.
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/eval.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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static const char *const var_names[] = {
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"w",
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"h",
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"cw",
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"ch",
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"hsub",
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"vsub",
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NULL
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};
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enum var_name {
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VAR_W,
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VAR_H,
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VAR_CW,
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VAR_CH,
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VAR_HSUB,
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VAR_VSUB,
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VARS_NB
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};
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typedef struct {
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int radius;
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int power;
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} FilterParam;
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typedef struct {
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FilterParam luma_param;
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FilterParam chroma_param;
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FilterParam alpha_param;
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char luma_radius_expr [256];
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char chroma_radius_expr[256];
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char alpha_radius_expr [256];
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int hsub, vsub;
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int radius[4];
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int power[4];
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uint8_t *temp[2]; ///< temporary buffer used in blur_power()
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} BoxBlurContext;
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#define Y 0
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#define U 1
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#define V 2
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#define A 3
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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BoxBlurContext *boxblur = ctx->priv;
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int e;
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if (!args) {
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av_log(ctx, AV_LOG_ERROR,
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"Filter expects 2 or 4 or 6 arguments, none provided\n");
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return AVERROR(EINVAL);
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}
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e = sscanf(args, "%255[^:]:%d:%255[^:]:%d:%255[^:]:%d",
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boxblur->luma_radius_expr, &boxblur->luma_param .power,
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boxblur->chroma_radius_expr, &boxblur->chroma_param.power,
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boxblur->alpha_radius_expr, &boxblur->alpha_param .power);
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if (e != 2 && e != 4 && e != 6) {
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av_log(ctx, AV_LOG_ERROR,
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"Filter expects 2 or 4 or 6 params, provided %d\n", e);
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return AVERROR(EINVAL);
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}
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if (e < 4) {
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boxblur->chroma_param.power = boxblur->luma_param.power;
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av_strlcpy(boxblur->chroma_radius_expr, boxblur->luma_radius_expr,
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sizeof(boxblur->chroma_radius_expr));
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}
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if (e < 6) {
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boxblur->alpha_param.power = boxblur->luma_param.power;
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av_strlcpy(boxblur->alpha_radius_expr, boxblur->luma_radius_expr,
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sizeof(boxblur->alpha_radius_expr));
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}
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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BoxBlurContext *boxblur = ctx->priv;
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av_freep(&boxblur->temp[0]);
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av_freep(&boxblur->temp[1]);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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enum PixelFormat pix_fmts[] = {
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PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
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PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUVA420P,
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PIX_FMT_YUV440P, PIX_FMT_GRAY8,
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
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PIX_FMT_YUVJ440P,
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PIX_FMT_NONE
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};
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avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format];
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AVFilterContext *ctx = inlink->dst;
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BoxBlurContext *boxblur = ctx->priv;
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int w = inlink->w, h = inlink->h;
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int cw, ch;
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double var_values[VARS_NB], res;
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char *expr;
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int ret;
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av_freep(&boxblur->temp[0]);
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av_freep(&boxblur->temp[1]);
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if (!(boxblur->temp[0] = av_malloc(FFMAX(w, h))))
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return AVERROR(ENOMEM);
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if (!(boxblur->temp[1] = av_malloc(FFMAX(w, h)))) {
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av_freep(&boxblur->temp[0]);
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return AVERROR(ENOMEM);
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}
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boxblur->hsub = desc->log2_chroma_w;
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boxblur->vsub = desc->log2_chroma_h;
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var_values[VAR_W] = inlink->w;
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var_values[VAR_H] = inlink->h;
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var_values[VAR_CW] = cw = w>>boxblur->hsub;
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var_values[VAR_CH] = ch = h>>boxblur->vsub;
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var_values[VAR_HSUB] = 1<<boxblur->hsub;
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var_values[VAR_VSUB] = 1<<boxblur->vsub;
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#define EVAL_RADIUS_EXPR(comp) \
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expr = boxblur->comp##_radius_expr; \
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ret = av_expr_parse_and_eval(&res, expr, var_names, var_values, \
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NULL, NULL, NULL, NULL, NULL, 0, ctx); \
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boxblur->comp##_param.radius = res; \
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if (ret < 0) { \
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av_log(NULL, AV_LOG_ERROR, \
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"Error when evaluating " #comp " radius expression '%s'\n", expr); \
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return ret; \
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}
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EVAL_RADIUS_EXPR(luma);
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EVAL_RADIUS_EXPR(chroma);
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EVAL_RADIUS_EXPR(alpha);
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av_log(ctx, AV_LOG_DEBUG,
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"luma_radius:%d luma_power:%d "
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"chroma_radius:%d chroma_power:%d "
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"alpha_radius:%d alpha_power:%d "
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"w:%d chroma_w:%d h:%d chroma_h:%d\n",
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boxblur->luma_param .radius, boxblur->luma_param .power,
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boxblur->chroma_param.radius, boxblur->chroma_param.power,
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boxblur->alpha_param .radius, boxblur->alpha_param .power,
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w, cw, h, ch);
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#define CHECK_RADIUS_VAL(w_, h_, comp) \
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if (boxblur->comp##_param.radius < 0 || \
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2*boxblur->comp##_param.radius > FFMIN(w_, h_)) { \
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av_log(ctx, AV_LOG_ERROR, \
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"Invalid " #comp " radius value %d, must be >= 0 and <= %d\n", \
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boxblur->comp##_param.radius, FFMIN(w_, h_)/2); \
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return AVERROR(EINVAL); \
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}
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CHECK_RADIUS_VAL(w, h, luma);
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CHECK_RADIUS_VAL(cw, ch, chroma);
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CHECK_RADIUS_VAL(w, h, alpha);
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boxblur->radius[Y] = boxblur->luma_param.radius;
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boxblur->radius[U] = boxblur->radius[V] = boxblur->chroma_param.radius;
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boxblur->radius[A] = boxblur->alpha_param.radius;
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boxblur->power[Y] = boxblur->luma_param.power;
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boxblur->power[U] = boxblur->power[V] = boxblur->chroma_param.power;
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boxblur->power[A] = boxblur->alpha_param.power;
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return 0;
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}
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static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
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int len, int radius)
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{
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/* Naive boxblur would sum source pixels from x-radius .. x+radius
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* for destination pixel x. That would be O(radius*width).
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* If you now look at what source pixels represent 2 consecutive
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* output pixels, then you see they are almost identical and only
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* differ by 2 pixels, like:
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* src0 111111111
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* dst0 1
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* src1 111111111
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* dst1 1
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* src0-src1 1 -1
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* so when you know one output pixel you can find the next by just adding
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* and subtracting 1 input pixel.
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* The following code adopts this faster variant.
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*/
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const int length = radius*2 + 1;
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const int inv = ((1<<16) + length/2)/length;
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int x, sum = 0;
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for (x = 0; x < radius; x++)
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sum += src[x*src_step]<<1;
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sum += src[radius*src_step];
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for (x = 0; x <= radius; x++) {
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sum += src[(radius+x)*src_step] - src[(radius-x)*src_step];
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dst[x*dst_step] = (sum*inv + (1<<15))>>16;
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}
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for (; x < len-radius; x++) {
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sum += src[(radius+x)*src_step] - src[(x-radius-1)*src_step];
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dst[x*dst_step] = (sum*inv + (1<<15))>>16;
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}
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for (; x < len; x++) {
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sum += src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step];
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dst[x*dst_step] = (sum*inv + (1<<15))>>16;
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}
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}
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static inline void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
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int len, int radius, int power, uint8_t *temp[2])
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{
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uint8_t *a = temp[0], *b = temp[1];
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if (radius && power) {
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blur(a, 1, src, src_step, len, radius);
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for (; power > 2; power--) {
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uint8_t *c;
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blur(b, 1, a, 1, len, radius);
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c = a; a = b; b = c;
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}
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if (power > 1) {
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blur(dst, dst_step, a, 1, len, radius);
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} else {
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int i;
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for (i = 0; i < len; i++)
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dst[i*dst_step] = a[i];
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}
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} else {
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int i;
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for (i = 0; i < len; i++)
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dst[i*dst_step] = src[i*src_step];
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}
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}
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static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
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int w, int h, int radius, int power, uint8_t *temp[2])
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{
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int y;
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if (radius == 0 && dst == src)
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return;
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for (y = 0; y < h; y++)
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blur_power(dst + y*dst_linesize, 1, src + y*src_linesize, 1,
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w, radius, power, temp);
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}
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static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
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int w, int h, int radius, int power, uint8_t *temp[2])
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{
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int x;
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if (radius == 0 && dst == src)
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return;
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for (x = 0; x < w; x++)
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blur_power(dst + x, dst_linesize, src + x, src_linesize,
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h, radius, power, temp);
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}
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static void draw_slice(AVFilterLink *inlink, int y0, int h0, int slice_dir)
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{
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AVFilterContext *ctx = inlink->dst;
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BoxBlurContext *boxblur = ctx->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFilterBufferRef *inpicref = inlink ->cur_buf;
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AVFilterBufferRef *outpicref = outlink->out_buf;
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int plane;
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int cw = inlink->w >> boxblur->hsub, ch = h0 >> boxblur->vsub;
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int w[4] = { inlink->w, cw, cw, inlink->w };
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int h[4] = { h0, ch, ch, h0 };
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for (plane = 0; inpicref->data[plane] && plane < 4; plane++)
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hblur(outpicref->data[plane], outpicref->linesize[plane],
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inpicref ->data[plane], inpicref ->linesize[plane],
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w[plane], h[plane], boxblur->radius[plane], boxblur->power[plane],
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boxblur->temp);
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for (plane = 0; inpicref->data[plane] && plane < 4; plane++)
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vblur(outpicref->data[plane], outpicref->linesize[plane],
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outpicref->data[plane], outpicref->linesize[plane],
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w[plane], h[plane], boxblur->radius[plane], boxblur->power[plane],
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boxblur->temp);
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avfilter_draw_slice(outlink, y0, h0, slice_dir);
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}
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AVFilter avfilter_vf_boxblur = {
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.name = "boxblur",
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.description = NULL_IF_CONFIG_SMALL("Blur the input."),
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.priv_size = sizeof(BoxBlurContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.draw_slice = draw_slice,
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.min_perms = AV_PERM_READ },
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL}},
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};
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