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| 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/eval.h" |
| 30 | +#include "libavutil/pixdesc.h" |
| 31 | +#include "avfilter.h" |
| 32 | + |
| 33 | +static const char *var_names[] = { |
| 34 | + "w", |
| 35 | + "h", |
| 36 | + "cw", |
| 37 | + "ch", |
| 38 | + "hsub", |
| 39 | + "vsub", |
| 40 | + NULL |
| 41 | +}; |
| 42 | + |
| 43 | +enum var_name { |
| 44 | + VAR_W, |
| 45 | + VAR_H, |
| 46 | + VAR_CW, |
| 47 | + VAR_CH, |
| 48 | + VAR_HSUB, |
| 49 | + VAR_VSUB, |
| 50 | + VARS_NB |
| 51 | +}; |
| 52 | + |
| 53 | +typedef struct { |
| 54 | + int radius; |
| 55 | + int power; |
| 56 | +} FilterParam; |
| 57 | + |
| 58 | +typedef struct { |
| 59 | + FilterParam luma_param; |
| 60 | + FilterParam chroma_param; |
| 61 | + FilterParam alpha_param; |
| 62 | + char luma_radius_expr [256]; |
| 63 | + char chroma_radius_expr[256]; |
| 64 | + char alpha_radius_expr [256]; |
| 65 | + |
| 66 | + int hsub, vsub; |
| 67 | + int radius[4]; |
| 68 | + int power[4]; |
| 69 | + uint8_t *temp[2]; ///< temporary buffer used in blur_power() |
| 70 | +} BoxBlurContext; |
| 71 | + |
| 72 | +#define Y 0 |
| 73 | +#define U 1 |
| 74 | +#define V 2 |
| 75 | +#define A 3 |
| 76 | + |
| 77 | +static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
| 78 | +{ |
| 79 | + BoxBlurContext *boxblur = ctx->priv; |
| 80 | + int e; |
| 81 | + |
| 82 | + if (!args) { |
| 83 | + av_log(ctx, AV_LOG_ERROR, |
| 84 | + "Filter expects 2 or 4 arguments, none provided\n"); |
| 85 | + return AVERROR(EINVAL); |
| 86 | + } |
| 87 | + |
| 88 | + e = sscanf(args, "%255[^:]:%d:%255[^:]:%d:%255[^:]:%d", |
| 89 | + boxblur->luma_radius_expr, &boxblur->luma_param .power, |
| 90 | + boxblur->chroma_radius_expr, &boxblur->chroma_param.power, |
| 91 | + boxblur->alpha_radius_expr, &boxblur->alpha_param .power); |
| 92 | + |
| 93 | + if (e != 2 && e != 4 && e != 6) { |
| 94 | + av_log(ctx, AV_LOG_ERROR, |
| 95 | + "Filter expects 2 or 4 or 6 params, provided %d\n", e); |
| 96 | + return AVERROR(EINVAL); |
| 97 | + } |
| 98 | + |
| 99 | + if (e < 4) { |
| 100 | + boxblur->chroma_param.power = boxblur->luma_param.power; |
| 101 | + av_strlcpy(boxblur->chroma_radius_expr, boxblur->luma_radius_expr, |
| 102 | + sizeof(boxblur->chroma_radius_expr)); |
| 103 | + } |
| 104 | + if (e < 6) { |
| 105 | + boxblur->alpha_param.power = boxblur->luma_param.power; |
| 106 | + av_strlcpy(boxblur->alpha_radius_expr, boxblur->luma_radius_expr, |
| 107 | + sizeof(boxblur->alpha_radius_expr)); |
| 108 | + } |
| 109 | + |
| 110 | + return 0; |
| 111 | +} |
| 112 | + |
| 113 | +static av_cold void uninit(AVFilterContext *ctx) |
| 114 | +{ |
| 115 | + BoxBlurContext *boxblur = ctx->priv; |
| 116 | + |
| 117 | + av_freep(&boxblur->temp[0]); |
| 118 | + av_freep(&boxblur->temp[1]); |
| 119 | +} |
| 120 | + |
| 121 | +static int query_formats(AVFilterContext *ctx) |
| 122 | +{ |
| 123 | + enum PixelFormat pix_fmts[] = { |
| 124 | + PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, |
| 125 | + PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUVA420P, |
| 126 | + PIX_FMT_YUV440P, PIX_FMT_GRAY8, |
| 127 | + PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P, |
| 128 | + PIX_FMT_YUVJ440P, |
| 129 | + PIX_FMT_NONE |
| 130 | + }; |
| 131 | + |
| 132 | + avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
| 133 | + return 0; |
| 134 | +} |
| 135 | + |
| 136 | +static int config_input(AVFilterLink *inlink) |
| 137 | +{ |
| 138 | + AVFilterContext *ctx = inlink->dst; |
| 139 | + BoxBlurContext *boxblur = ctx->priv; |
| 140 | + const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format]; |
| 141 | + int w = inlink->w, h = inlink->h; |
| 142 | + int cw, ch; |
| 143 | + double var_values[VARS_NB], res; |
| 144 | + char *expr; |
| 145 | + int ret; |
| 146 | + |
| 147 | + if (!(boxblur->temp[0] = av_malloc(w)) || |
| 148 | + !(boxblur->temp[1] = av_malloc(w))) |
| 149 | + return AVERROR(ENOMEM); |
| 150 | + |
| 151 | + boxblur->hsub = desc->log2_chroma_w; |
| 152 | + boxblur->vsub = desc->log2_chroma_h; |
| 153 | + |
| 154 | + var_values[VAR_W] = inlink->w; |
| 155 | + var_values[VAR_H] = inlink->h; |
| 156 | + var_values[VAR_CW] = cw = w>>boxblur->hsub; |
| 157 | + var_values[VAR_CH] = ch = h>>boxblur->vsub; |
| 158 | + var_values[VAR_HSUB] = 1<<boxblur->hsub; |
| 159 | + var_values[VAR_VSUB] = 1<<boxblur->vsub; |
| 160 | + |
| 161 | +#define EVAL_RADIUS_EXPR(comp) \ |
| 162 | + expr = boxblur->comp##_radius_expr; \ |
| 163 | + ret = av_expr_parse_and_eval(&res, expr, var_names, var_values, \ |
| 164 | + NULL, NULL, NULL, NULL, NULL, 0, ctx); \ |
| 165 | + boxblur->comp##_param.radius = res; \ |
| 166 | + if (ret < 0) { \ |
| 167 | + av_log(NULL, AV_LOG_ERROR, \ |
| 168 | + "Error when evaluating " #comp " radius expression '%s'\n", expr); \ |
| 169 | + return ret; \ |
| 170 | + } |
| 171 | + EVAL_RADIUS_EXPR(luma); |
| 172 | + EVAL_RADIUS_EXPR(chroma); |
| 173 | + EVAL_RADIUS_EXPR(alpha); |
| 174 | + |
| 175 | + av_log(ctx, AV_LOG_INFO, |
| 176 | + "luma_radius:%d luma_power:%d " |
| 177 | + "chroma_radius:%d chroma_power:%d " |
| 178 | + "alpha_radius:%d alpha_power:%d " |
| 179 | + "w:%d chroma_w:%d h:%d chroma_h:%d\n", |
| 180 | + boxblur->luma_param .radius, boxblur->luma_param .power, |
| 181 | + boxblur->chroma_param.radius, boxblur->chroma_param.power, |
| 182 | + boxblur->alpha_param .radius, boxblur->alpha_param .power, |
| 183 | + w, cw, h, ch); |
| 184 | + |
| 185 | +#define CHECK_RADIUS_VAL(w_, h_, comp) \ |
| 186 | + if (boxblur->comp##_param.radius < 0 || \ |
| 187 | + 2*boxblur->comp##_param.radius > FFMIN(w_, h_)) { \ |
| 188 | + av_log(ctx, AV_LOG_ERROR, \ |
| 189 | + "Invalid " #comp " radius value %d, must be >= 0 and <= %d\n", \ |
| 190 | + boxblur->comp##_param.radius, FFMIN(w_, h_)/2); \ |
| 191 | + return AVERROR(EINVAL); \ |
| 192 | + } |
| 193 | + CHECK_RADIUS_VAL(w, h, luma); |
| 194 | + CHECK_RADIUS_VAL(cw, ch, chroma); |
| 195 | + CHECK_RADIUS_VAL(w, h, alpha); |
| 196 | + |
| 197 | + boxblur->radius[Y] = boxblur->luma_param.radius; |
| 198 | + boxblur->radius[U] = boxblur->radius[V] = boxblur->chroma_param.radius; |
| 199 | + boxblur->radius[A] = boxblur->alpha_param.radius; |
| 200 | + |
| 201 | + boxblur->power[Y] = boxblur->luma_param.power; |
| 202 | + boxblur->power[U] = boxblur->power[V] = boxblur->chroma_param.power; |
| 203 | + boxblur->power[A] = boxblur->alpha_param.power; |
| 204 | + |
| 205 | + return 0; |
| 206 | +} |
| 207 | + |
| 208 | +static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, |
| 209 | + int w, int radius) |
| 210 | +{ |
| 211 | + /* Naive boxblur would sum source pixels from x-radius .. x+radius |
| 212 | + * for destination pixel x. That would be O(radius*width). |
| 213 | + * If you now look at what source pixels represent 2 consecutive |
| 214 | + * output pixels, then you see they are almost identical and only |
| 215 | + * differ by 2 pixels, like: |
| 216 | + * src0 111111111 |
| 217 | + * dst0 1 |
| 218 | + * src1 111111111 |
| 219 | + * dst1 1 |
| 220 | + * src0-src1 1 -1 |
| 221 | + * so when you know one output pixel you can find the next by just adding |
| 222 | + * and subtracting 1 input pixel. |
| 223 | + * The following code adopts this faster variant. |
| 224 | + */ |
| 225 | + int x, sum = 0; |
| 226 | + const int length = radius*2 + 1; |
| 227 | + const int inv = ((1<<16) + length/2)/length; |
| 228 | + |
| 229 | + for (x = 0; x < radius; x++) |
| 230 | + sum += src[x*src_step]<<1; |
| 231 | + sum += src[radius*src_step]; |
| 232 | + |
| 233 | + for (x = 0; x <= radius; x++) { |
| 234 | + sum += src[(radius+x)*src_step] - src[(radius-x)*src_step]; |
| 235 | + dst[x*dst_step] = (sum*inv + (1<<15))>>16; |
| 236 | + } |
| 237 | + |
| 238 | + for (; x < w-radius; x++) { |
| 239 | + sum += src[(radius+x)*src_step] - src[(x-radius-1)*src_step]; |
| 240 | + dst[x*dst_step] = (sum*inv + (1<<15))>>16; |
| 241 | + } |
| 242 | + |
| 243 | + for (; x < w; x++) { |
| 244 | + sum += src[(2*w-radius-x-1)*src_step] - src[(x-radius-1)*src_step]; |
| 245 | + dst[x*dst_step] = (sum*inv + (1<<15))>>16; |
| 246 | + } |
| 247 | +} |
| 248 | + |
| 249 | +static inline void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, |
| 250 | + int w, int radius, int power, uint8_t *temp[2]) |
| 251 | +{ |
| 252 | + uint8_t *a = temp[0], *b = temp[1]; |
| 253 | + |
| 254 | + if (radius && power) { |
| 255 | + blur(a, 1, src, src_step, w, radius); |
| 256 | + for (; power > 2; power--) { |
| 257 | + uint8_t *c; |
| 258 | + blur(b, 1, a, 1, w, radius); |
| 259 | + c = a; a = b; b = c; |
| 260 | + } |
| 261 | + if (power > 1) { |
| 262 | + blur(dst, dst_step, a, 1, w, radius); |
| 263 | + } else { |
| 264 | + int i; |
| 265 | + for (i = 0; i < w; i++) |
| 266 | + dst[i*dst_step] = a[i]; |
| 267 | + } |
| 268 | + } else { |
| 269 | + int i; |
| 270 | + for (i = 0; i < w; i++) |
| 271 | + dst[i*dst_step] = src[i*src_step]; |
| 272 | + } |
| 273 | +} |
| 274 | + |
| 275 | +static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, |
| 276 | + int w, int h, int radius, int power, uint8_t *temp[2]) |
| 277 | +{ |
| 278 | + int y; |
| 279 | + |
| 280 | + if (radius == 0 && dst == src) |
| 281 | + return; |
| 282 | + |
| 283 | + for (y = 0; y < h; y++) |
| 284 | + blur_power(dst + y*dst_linesize, 1, src + y*src_linesize, 1, |
| 285 | + w, radius, power, temp); |
| 286 | +} |
| 287 | + |
| 288 | +static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, |
| 289 | + int w, int h, int radius, int power, uint8_t *temp[2]) |
| 290 | +{ |
| 291 | + int x; |
| 292 | + |
| 293 | + if (radius == 0 && dst == src) |
| 294 | + return; |
| 295 | + |
| 296 | + for (x = 0; x < w; x++) |
| 297 | + blur_power(dst + x, dst_linesize, src + x, src_linesize, |
| 298 | + h, radius, power, temp); |
| 299 | +} |
| 300 | + |
| 301 | +static void draw_slice(AVFilterLink *inlink, int y0, int h0, int slice_dir) |
| 302 | +{ |
| 303 | + AVFilterContext *ctx = inlink->dst; |
| 304 | + BoxBlurContext *boxblur = ctx->priv; |
| 305 | + AVFilterLink *outlink = inlink->dst->outputs[0]; |
| 306 | + AVFilterBufferRef *inpicref = inlink ->cur_buf; |
| 307 | + AVFilterBufferRef *outpicref = outlink->out_buf; |
| 308 | + int plane; |
| 309 | + int cw = inlink->w >> boxblur->hsub, ch = h0 >> boxblur->vsub; |
| 310 | + int w[4] = { inlink->w, cw, cw, inlink->w }; |
| 311 | + int h[4] = { h0, ch, ch, h0 }; |
| 312 | + uint8_t *dst[4], *src[4]; |
| 313 | + |
| 314 | + for (plane = 0; inpicref->data[plane] && plane < 4; plane++) { |
| 315 | + int y = plane == 1 || plane == 2 ? y0 >> boxblur->vsub : y0; |
| 316 | + src[plane] = inpicref ->data[plane] + inpicref ->linesize[plane] * y; |
| 317 | + dst[plane] = outpicref->data[plane] + outpicref->linesize[plane] * y; |
| 318 | + } |
| 319 | + |
| 320 | + for (plane = 0; inpicref->data[plane] && plane < 4; plane++) |
| 321 | + hblur(outpicref->data[plane], outpicref->linesize[plane], |
| 322 | + inpicref ->data[plane], inpicref ->linesize[plane], |
| 323 | + w[plane], h[plane], boxblur->radius[plane], boxblur->power[plane], |
| 324 | + boxblur->temp); |
| 325 | + |
| 326 | + for (plane = 0; inpicref->data[plane] && plane < 4; plane++) |
| 327 | + vblur(outpicref->data[plane], outpicref->linesize[plane], |
| 328 | + outpicref->data[plane], outpicref->linesize[plane], |
| 329 | + w[plane], h[plane], boxblur->radius[plane], boxblur->power[plane], |
| 330 | + boxblur->temp); |
| 331 | +} |
| 332 | + |
| 333 | +AVFilter avfilter_vf_boxblur = { |
| 334 | + .name = "boxblur", |
| 335 | + .description = NULL_IF_CONFIG_SMALL("Blur the input."), |
| 336 | + .priv_size = sizeof(BoxBlurContext), |
| 337 | + .init = init, |
| 338 | + .uninit = uninit, |
| 339 | + .query_formats = query_formats, |
| 340 | + |
| 341 | + .inputs = (AVFilterPad[]) {{ .name = "default", |
| 342 | + .type = AVMEDIA_TYPE_VIDEO, |
| 343 | + .config_props = config_input, |
| 344 | + .draw_slice = draw_slice, |
| 345 | + .min_perms = AV_PERM_READ }, |
| 346 | + { .name = NULL}}, |
| 347 | + .outputs = (AVFilterPad[]) {{ .name = "default", |
| 348 | + .type = AVMEDIA_TYPE_VIDEO, }, |
| 349 | + { .name = NULL}}, |
| 350 | +}; |