LCOV - code coverage report
Current view: top level - libavfilter - vf_boxblur.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 102 124 82.3 %
Date: 2017-12-15 11:05:35 Functions: 10 11 90.9 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
       3             :  * Copyright (c) 2011 Stefano Sabatini
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or modify
       8             :  * it under the terms of the GNU General Public License as published by
       9             :  * the Free Software Foundation; either version 2 of the License, or
      10             :  * (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :  * GNU General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU General Public License along
      18             :  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
      19             :  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * Apply a boxblur filter to the input video.
      25             :  * Ported from MPlayer libmpcodecs/vf_boxblur.c.
      26             :  */
      27             : 
      28             : #include "libavutil/avstring.h"
      29             : #include "libavutil/common.h"
      30             : #include "libavutil/eval.h"
      31             : #include "libavutil/opt.h"
      32             : #include "libavutil/pixdesc.h"
      33             : #include "avfilter.h"
      34             : #include "formats.h"
      35             : #include "internal.h"
      36             : #include "video.h"
      37             : 
      38             : static const char *const var_names[] = {
      39             :     "w",
      40             :     "h",
      41             :     "cw",
      42             :     "ch",
      43             :     "hsub",
      44             :     "vsub",
      45             :     NULL
      46             : };
      47             : 
      48             : enum var_name {
      49             :     VAR_W,
      50             :     VAR_H,
      51             :     VAR_CW,
      52             :     VAR_CH,
      53             :     VAR_HSUB,
      54             :     VAR_VSUB,
      55             :     VARS_NB
      56             : };
      57             : 
      58             : typedef struct FilterParam {
      59             :     int radius;
      60             :     int power;
      61             :     char *radius_expr;
      62             : } FilterParam;
      63             : 
      64             : typedef struct BoxBlurContext {
      65             :     const AVClass *class;
      66             :     FilterParam luma_param;
      67             :     FilterParam chroma_param;
      68             :     FilterParam alpha_param;
      69             : 
      70             :     int hsub, vsub;
      71             :     int radius[4];
      72             :     int power[4];
      73             :     uint8_t *temp[2]; ///< temporary buffer used in blur_power()
      74             : } BoxBlurContext;
      75             : 
      76             : #define Y 0
      77             : #define U 1
      78             : #define V 2
      79             : #define A 3
      80             : 
      81           1 : static av_cold int init(AVFilterContext *ctx)
      82             : {
      83           1 :     BoxBlurContext *s = ctx->priv;
      84             : 
      85           1 :     if (!s->luma_param.radius_expr) {
      86           0 :         av_log(ctx, AV_LOG_ERROR, "Luma radius expression is not set.\n");
      87           0 :         return AVERROR(EINVAL);
      88             :     }
      89             : 
      90             :     /* fill missing params */
      91           1 :     if (!s->chroma_param.radius_expr) {
      92           1 :         s->chroma_param.radius_expr = av_strdup(s->luma_param.radius_expr);
      93           1 :         if (!s->chroma_param.radius_expr)
      94           0 :             return AVERROR(ENOMEM);
      95             :     }
      96           1 :     if (s->chroma_param.power < 0)
      97           1 :         s->chroma_param.power = s->luma_param.power;
      98             : 
      99           1 :     if (!s->alpha_param.radius_expr) {
     100           1 :         s->alpha_param.radius_expr = av_strdup(s->luma_param.radius_expr);
     101           1 :         if (!s->alpha_param.radius_expr)
     102           0 :             return AVERROR(ENOMEM);
     103             :     }
     104           1 :     if (s->alpha_param.power < 0)
     105           1 :         s->alpha_param.power = s->luma_param.power;
     106             : 
     107           1 :     return 0;
     108             : }
     109             : 
     110           1 : static av_cold void uninit(AVFilterContext *ctx)
     111             : {
     112           1 :     BoxBlurContext *s = ctx->priv;
     113             : 
     114           1 :     av_freep(&s->temp[0]);
     115           1 :     av_freep(&s->temp[1]);
     116           1 : }
     117             : 
     118           1 : static int query_formats(AVFilterContext *ctx)
     119             : {
     120           1 :     AVFilterFormats *formats = NULL;
     121             :     int fmt, ret;
     122             : 
     123         184 :     for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
     124         183 :         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
     125         346 :         if (!(desc->flags & (AV_PIX_FMT_FLAG_HWACCEL | AV_PIX_FMT_FLAG_BITSTREAM | AV_PIX_FMT_FLAG_PAL)) &&
     126         335 :             (desc->flags & AV_PIX_FMT_FLAG_PLANAR || desc->nb_components == 1) &&
     127         212 :             (!(desc->flags & AV_PIX_FMT_FLAG_BE) == !HAVE_BIGENDIAN || desc->comp[0].depth == 8) &&
     128          63 :             (ret = ff_add_format(&formats, fmt)) < 0)
     129           0 :             return ret;
     130             :     }
     131             : 
     132           1 :     return ff_set_common_formats(ctx, formats);
     133             : }
     134             : 
     135           1 : static int config_input(AVFilterLink *inlink)
     136             : {
     137           1 :     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     138           1 :     AVFilterContext    *ctx = inlink->dst;
     139           1 :     BoxBlurContext *s = ctx->priv;
     140           1 :     int w = inlink->w, h = inlink->h;
     141             :     int cw, ch;
     142             :     double var_values[VARS_NB], res;
     143             :     char *expr;
     144             :     int ret;
     145             : 
     146           2 :     if (!(s->temp[0] = av_malloc(2*FFMAX(w, h))) ||
     147           1 :         !(s->temp[1] = av_malloc(2*FFMAX(w, h))))
     148           0 :         return AVERROR(ENOMEM);
     149             : 
     150           1 :     s->hsub = desc->log2_chroma_w;
     151           1 :     s->vsub = desc->log2_chroma_h;
     152             : 
     153           1 :     var_values[VAR_W]       = inlink->w;
     154           1 :     var_values[VAR_H]       = inlink->h;
     155           1 :     var_values[VAR_CW] = cw = w>>s->hsub;
     156           1 :     var_values[VAR_CH] = ch = h>>s->vsub;
     157           1 :     var_values[VAR_HSUB]    = 1<<s->hsub;
     158           1 :     var_values[VAR_VSUB]    = 1<<s->vsub;
     159             : 
     160             : #define EVAL_RADIUS_EXPR(comp)                                          \
     161             :     expr = s->comp##_param.radius_expr;                                 \
     162             :     ret = av_expr_parse_and_eval(&res, expr, var_names, var_values,     \
     163             :                                  NULL, NULL, NULL, NULL, NULL, 0, ctx); \
     164             :     s->comp##_param.radius = res;                                       \
     165             :     if (ret < 0) {                                                      \
     166             :         av_log(NULL, AV_LOG_ERROR,                                      \
     167             :                "Error when evaluating " #comp " radius expression '%s'\n", expr); \
     168             :         return ret;                                                     \
     169             :     }
     170           1 :     EVAL_RADIUS_EXPR(luma);
     171           1 :     EVAL_RADIUS_EXPR(chroma);
     172           1 :     EVAL_RADIUS_EXPR(alpha);
     173             : 
     174           1 :     av_log(ctx, AV_LOG_VERBOSE,
     175             :            "luma_radius:%d luma_power:%d "
     176             :            "chroma_radius:%d chroma_power:%d "
     177             :            "alpha_radius:%d alpha_power:%d "
     178             :            "w:%d chroma_w:%d h:%d chroma_h:%d\n",
     179             :            s->luma_param  .radius, s->luma_param  .power,
     180             :            s->chroma_param.radius, s->chroma_param.power,
     181             :            s->alpha_param .radius, s->alpha_param .power,
     182             :            w, cw, h, ch);
     183             : 
     184             : #define CHECK_RADIUS_VAL(w_, h_, comp)                                  \
     185             :     if (s->comp##_param.radius < 0 ||                                   \
     186             :         2*s->comp##_param.radius > FFMIN(w_, h_)) {                     \
     187             :         av_log(ctx, AV_LOG_ERROR,                                       \
     188             :                "Invalid " #comp " radius value %d, must be >= 0 and <= %d\n", \
     189             :                s->comp##_param.radius, FFMIN(w_, h_)/2);                \
     190             :         return AVERROR(EINVAL);                                         \
     191             :     }
     192           1 :     CHECK_RADIUS_VAL(w,  h,  luma);
     193           1 :     CHECK_RADIUS_VAL(cw, ch, chroma);
     194           1 :     CHECK_RADIUS_VAL(w,  h,  alpha);
     195             : 
     196           1 :     s->radius[Y] = s->luma_param.radius;
     197           1 :     s->radius[U] = s->radius[V] = s->chroma_param.radius;
     198           1 :     s->radius[A] = s->alpha_param.radius;
     199             : 
     200           1 :     s->power[Y] = s->luma_param.power;
     201           1 :     s->power[U] = s->power[V] = s->chroma_param.power;
     202           1 :     s->power[A] = s->alpha_param.power;
     203             : 
     204           1 :     return 0;
     205             : }
     206             : 
     207             : /* Naive boxblur would sum source pixels from x-radius .. x+radius
     208             :  * for destination pixel x. That would be O(radius*width).
     209             :  * If you now look at what source pixels represent 2 consecutive
     210             :  * output pixels, then you see they are almost identical and only
     211             :  * differ by 2 pixels, like:
     212             :  * src0       111111111
     213             :  * dst0           1
     214             :  * src1        111111111
     215             :  * dst1            1
     216             :  * src0-src1  1       -1
     217             :  * so when you know one output pixel you can find the next by just adding
     218             :  * and subtracting 1 input pixel.
     219             :  * The following code adopts this faster variant.
     220             :  */
     221             : #define BLUR(type, depth)                                                   \
     222             : static inline void blur ## depth(type *dst, int dst_step, const type *src,  \
     223             :                                  int src_step, int len, int radius)         \
     224             : {                                                                           \
     225             :     const int length = radius*2 + 1;                                        \
     226             :     const int inv = ((1<<16) + length/2)/length;                            \
     227             :     int x, sum = src[radius*src_step];                                      \
     228             :                                                                             \
     229             :     for (x = 0; x < radius; x++)                                            \
     230             :         sum += src[x*src_step]<<1;                                          \
     231             :                                                                             \
     232             :     sum = sum*inv + (1<<15);                                                \
     233             :                                                                             \
     234             :     for (x = 0; x <= radius; x++) {                                         \
     235             :         sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv;   \
     236             :         dst[x*dst_step] = sum>>16;                                          \
     237             :     }                                                                       \
     238             :                                                                             \
     239             :     for (; x < len-radius; x++) {                                           \
     240             :         sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv; \
     241             :         dst[x*dst_step] = sum >>16;                                         \
     242             :     }                                                                       \
     243             :                                                                             \
     244             :     for (; x < len; x++) {                                                  \
     245             :         sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv; \
     246             :         dst[x*dst_step] = sum>>16;                                          \
     247             :     }                                                                       \
     248             : }
     249             : 
     250       64000 : BLUR(uint8_t,   8)
     251           0 : BLUR(uint16_t, 16)
     252             : 
     253             : #undef BLUR
     254             : 
     255       64000 : static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
     256             :                         int len, int radius, int pixsize)
     257             : {
     258       64000 :     if (pixsize == 1) blur8 (dst, dst_step   , src, src_step   , len, radius);
     259           0 :     else              blur16((uint16_t*)dst, dst_step>>1, (const uint16_t*)src, src_step>>1, len, radius);
     260       64000 : }
     261             : 
     262       64000 : static inline void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
     263             :                               int len, int radius, int power, uint8_t *temp[2], int pixsize)
     264             : {
     265       64000 :     uint8_t *a = temp[0], *b = temp[1];
     266             : 
     267       64000 :     if (radius && power) {
     268       64000 :         blur(a, pixsize, src, src_step, len, radius, pixsize);
     269       64000 :         for (; power > 2; power--) {
     270             :             uint8_t *c;
     271           0 :             blur(b, pixsize, a, pixsize, len, radius, pixsize);
     272           0 :             c = a; a = b; b = c;
     273             :         }
     274      128000 :         if (power > 1) {
     275           0 :             blur(dst, dst_step, a, pixsize, len, radius, pixsize);
     276             :         } else {
     277             :             int i;
     278       64000 :             if (pixsize == 1) {
     279    15270400 :                 for (i = 0; i < len; i++)
     280    15206400 :                     dst[i*dst_step] = a[i];
     281             :             } else
     282           0 :                 for (i = 0; i < len; i++)
     283           0 :                     *(uint16_t*)(dst + i*dst_step) = ((uint16_t*)a)[i];
     284             :         }
     285             :     } else {
     286             :         int i;
     287           0 :         if (pixsize == 1) {
     288           0 :             for (i = 0; i < len; i++)
     289           0 :                 dst[i*dst_step] = src[i*src_step];
     290             :         } else
     291           0 :             for (i = 0; i < len; i++)
     292           0 :                 *(uint16_t*)(dst + i*dst_step) = *(uint16_t*)(src + i*src_step);
     293             :     }
     294       64000 : }
     295             : 
     296         150 : static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
     297             :                   int w, int h, int radius, int power, uint8_t *temp[2], int pixsize)
     298             : {
     299             :     int y;
     300             : 
     301         150 :     if (radius == 0 && dst == src)
     302           0 :         return;
     303             : 
     304       28950 :     for (y = 0; y < h; y++)
     305       28800 :         blur_power(dst + y*dst_linesize, pixsize, src + y*src_linesize, pixsize,
     306             :                    w, radius, power, temp, pixsize);
     307             : }
     308             : 
     309         150 : static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
     310             :                   int w, int h, int radius, int power, uint8_t *temp[2], int pixsize)
     311             : {
     312             :     int x;
     313             : 
     314         150 :     if (radius == 0 && dst == src)
     315           0 :         return;
     316             : 
     317       35350 :     for (x = 0; x < w; x++)
     318       35200 :         blur_power(dst + x*pixsize, dst_linesize, src + x*pixsize, src_linesize,
     319             :                    h, radius, power, temp, pixsize);
     320             : }
     321             : 
     322          50 : static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     323             : {
     324          50 :     AVFilterContext *ctx = inlink->dst;
     325          50 :     BoxBlurContext *s = ctx->priv;
     326          50 :     AVFilterLink *outlink = inlink->dst->outputs[0];
     327             :     AVFrame *out;
     328             :     int plane;
     329          50 :     int cw = AV_CEIL_RSHIFT(inlink->w, s->hsub), ch = AV_CEIL_RSHIFT(in->height, s->vsub);
     330          50 :     int w[4] = { inlink->w, cw, cw, inlink->w };
     331          50 :     int h[4] = { in->height, ch, ch, in->height };
     332          50 :     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     333          50 :     const int depth = desc->comp[0].depth;
     334          50 :     const int pixsize = (depth+7)/8;
     335             : 
     336          50 :     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     337          50 :     if (!out) {
     338           0 :         av_frame_free(&in);
     339           0 :         return AVERROR(ENOMEM);
     340             :     }
     341          50 :     av_frame_copy_props(out, in);
     342             : 
     343         200 :     for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++)
     344         450 :         hblur(out->data[plane], out->linesize[plane],
     345         300 :               in ->data[plane], in ->linesize[plane],
     346             :               w[plane], h[plane], s->radius[plane], s->power[plane],
     347         150 :               s->temp, pixsize);
     348             : 
     349         200 :     for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++)
     350         300 :         vblur(out->data[plane], out->linesize[plane],
     351         150 :               out->data[plane], out->linesize[plane],
     352             :               w[plane], h[plane], s->radius[plane], s->power[plane],
     353         150 :               s->temp, pixsize);
     354             : 
     355          50 :     av_frame_free(&in);
     356             : 
     357          50 :     return ff_filter_frame(outlink, out);
     358             : }
     359             : 
     360             : #define OFFSET(x) offsetof(BoxBlurContext, x)
     361             : #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
     362             : 
     363             : static const AVOption boxblur_options[] = {
     364             :     { "luma_radius", "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },
     365             :     { "lr",          "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },
     366             :     { "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 },
     367             :     { "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 },
     368             : 
     369             :     { "chroma_radius", "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
     370             :     { "cr",            "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
     371             :     { "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 },
     372             :     { "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 },
     373             : 
     374             :     { "alpha_radius", "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
     375             :     { "ar",           "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
     376             :     { "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 },
     377             :     { "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 },
     378             : 
     379             :     { NULL }
     380             : };
     381             : 
     382             : AVFILTER_DEFINE_CLASS(boxblur);
     383             : 
     384             : static const AVFilterPad avfilter_vf_boxblur_inputs[] = {
     385             :     {
     386             :         .name         = "default",
     387             :         .type         = AVMEDIA_TYPE_VIDEO,
     388             :         .config_props = config_input,
     389             :         .filter_frame = filter_frame,
     390             :     },
     391             :     { NULL }
     392             : };
     393             : 
     394             : static const AVFilterPad avfilter_vf_boxblur_outputs[] = {
     395             :     {
     396             :         .name = "default",
     397             :         .type = AVMEDIA_TYPE_VIDEO,
     398             :     },
     399             :     { NULL }
     400             : };
     401             : 
     402             : AVFilter ff_vf_boxblur = {
     403             :     .name          = "boxblur",
     404             :     .description   = NULL_IF_CONFIG_SMALL("Blur the input."),
     405             :     .priv_size     = sizeof(BoxBlurContext),
     406             :     .priv_class    = &boxblur_class,
     407             :     .init          = init,
     408             :     .uninit        = uninit,
     409             :     .query_formats = query_formats,
     410             :     .inputs        = avfilter_vf_boxblur_inputs,
     411             :     .outputs       = avfilter_vf_boxblur_outputs,
     412             :     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
     413             : };

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