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Diffstat (limited to 'libavfilter/vf_sab.c')
| -rw-r--r-- | libavfilter/vf_sab.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/libavfilter/vf_sab.c b/libavfilter/vf_sab.c new file mode 100644 index 0000000000..da59439652 --- /dev/null +++ b/libavfilter/vf_sab.c @@ -0,0 +1,337 @@ +/* + * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> + * + * 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 + * Shape Adaptive Blur filter, ported from MPlayer libmpcodecs/vf_sab.c + */ + +#include "libavutil/opt.h" +#include "libavutil/pixdesc.h" +#include "libswscale/swscale.h" + +#include "avfilter.h" +#include "formats.h" +#include "internal.h" + +typedef struct { + float radius; + float pre_filter_radius; + float strength; + float quality; + struct SwsContext *pre_filter_context; + uint8_t *pre_filter_buf; + int pre_filter_linesize; + int dist_width; + int dist_linesize; + int *dist_coeff; +#define COLOR_DIFF_COEFF_SIZE 512 + int color_diff_coeff[COLOR_DIFF_COEFF_SIZE]; +} FilterParam; + +typedef struct { + const AVClass *class; + FilterParam luma; + FilterParam chroma; + int hsub; + int vsub; + unsigned int sws_flags; +} SabContext; + +static int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pix_fmts[] = { + AV_PIX_FMT_YUV420P, + AV_PIX_FMT_YUV410P, + AV_PIX_FMT_YUV444P, + AV_PIX_FMT_YUV422P, + AV_PIX_FMT_YUV411P, + AV_PIX_FMT_NONE + }; + AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); + if (!fmts_list) + return AVERROR(ENOMEM); + return ff_set_common_formats(ctx, fmts_list); +} + +#define RADIUS_MIN 0.1 +#define RADIUS_MAX 4.0 + +#define PRE_FILTER_RADIUS_MIN 0.1 +#define PRE_FILTER_RADIUS_MAX 2.0 + +#define STRENGTH_MIN 0.1 +#define STRENGTH_MAX 100.0 + +#define OFFSET(x) offsetof(SabContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM + +static const AVOption sab_options[] = { + { "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, + { "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, + { "luma_pre_filter_radius", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, + { "lpfr", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, + { "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, + { "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, + + { "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, + { "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, + { "chroma_pre_filter_radius", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1}, + PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, + { "cpfr", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1}, + PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, + { "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, + { "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, + + { NULL } +}; + +AVFILTER_DEFINE_CLASS(sab); + +static av_cold int init(AVFilterContext *ctx) +{ + SabContext *sab = ctx->priv; + + /* make chroma default to luma values, if not explicitly set */ + if (sab->chroma.radius < RADIUS_MIN) + sab->chroma.radius = sab->luma.radius; + if (sab->chroma.pre_filter_radius < PRE_FILTER_RADIUS_MIN) + sab->chroma.pre_filter_radius = sab->luma.pre_filter_radius; + if (sab->chroma.strength < STRENGTH_MIN) + sab->chroma.strength = sab->luma.strength; + + sab->luma.quality = sab->chroma.quality = 3.0; + sab->sws_flags = SWS_POINT; + + av_log(ctx, AV_LOG_VERBOSE, + "luma_radius:%f luma_pre_filter_radius::%f luma_strength:%f " + "chroma_radius:%f chroma_pre_filter_radius:%f chroma_strength:%f\n", + sab->luma .radius, sab->luma .pre_filter_radius, sab->luma .strength, + sab->chroma.radius, sab->chroma.pre_filter_radius, sab->chroma.strength); + return 0; +} + +static void close_filter_param(FilterParam *f) +{ + if (f->pre_filter_context) { + sws_freeContext(f->pre_filter_context); + f->pre_filter_context = NULL; + } + av_freep(&f->pre_filter_buf); + av_freep(&f->dist_coeff); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + SabContext *sab = ctx->priv; + + close_filter_param(&sab->luma); + close_filter_param(&sab->chroma); +} + +static int open_filter_param(FilterParam *f, int width, int height, unsigned int sws_flags) +{ + SwsVector *vec; + SwsFilter sws_f; + int i, x, y; + int linesize = FFALIGN(width, 8); + + f->pre_filter_buf = av_malloc(linesize * height); + if (!f->pre_filter_buf) + return AVERROR(ENOMEM); + + f->pre_filter_linesize = linesize; + vec = sws_getGaussianVec(f->pre_filter_radius, f->quality); + sws_f.lumH = sws_f.lumV = vec; + sws_f.chrH = sws_f.chrV = NULL; + f->pre_filter_context = sws_getContext(width, height, AV_PIX_FMT_GRAY8, + width, height, AV_PIX_FMT_GRAY8, + sws_flags, &sws_f, NULL, NULL); + sws_freeVec(vec); + + vec = sws_getGaussianVec(f->strength, 5.0); + for (i = 0; i < COLOR_DIFF_COEFF_SIZE; i++) { + double d; + int index = i-COLOR_DIFF_COEFF_SIZE/2 + vec->length/2; + + if (index < 0 || index >= vec->length) d = 0.0; + else d = vec->coeff[index]; + + f->color_diff_coeff[i] = (int)(d/vec->coeff[vec->length/2]*(1<<12) + 0.5); + } + sws_freeVec(vec); + + vec = sws_getGaussianVec(f->radius, f->quality); + f->dist_width = vec->length; + f->dist_linesize = FFALIGN(vec->length, 8); + f->dist_coeff = av_malloc_array(f->dist_width, f->dist_linesize * sizeof(*f->dist_coeff)); + if (!f->dist_coeff) { + sws_freeVec(vec); + return AVERROR(ENOMEM); + } + + for (y = 0; y < vec->length; y++) { + for (x = 0; x < vec->length; x++) { + double d = vec->coeff[x] * vec->coeff[y]; + f->dist_coeff[x + y*f->dist_linesize] = (int)(d*(1<<10) + 0.5); + } + } + sws_freeVec(vec); + + return 0; +} + +static int config_props(AVFilterLink *inlink) +{ + SabContext *sab = inlink->dst->priv; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); + int ret; + + sab->hsub = desc->log2_chroma_w; + sab->vsub = desc->log2_chroma_h; + + close_filter_param(&sab->luma); + ret = open_filter_param(&sab->luma, inlink->w, inlink->h, sab->sws_flags); + if (ret < 0) + return ret; + + close_filter_param(&sab->chroma); + ret = open_filter_param(&sab->chroma, + FF_CEIL_RSHIFT(inlink->w, sab->hsub), + FF_CEIL_RSHIFT(inlink->h, sab->vsub), sab->sws_flags); + return ret; +} + +#define NB_PLANES 4 + +static void blur(uint8_t *dst, const int dst_linesize, + const uint8_t *src, const int src_linesize, + const int w, const int h, FilterParam *fp) +{ + int x, y; + FilterParam f = *fp; + const int radius = f.dist_width/2; + + const uint8_t * const src2[NB_PLANES] = { src }; + int src2_linesize[NB_PLANES] = { src_linesize }; + uint8_t *dst2[NB_PLANES] = { f.pre_filter_buf }; + int dst2_linesize[NB_PLANES] = { f.pre_filter_linesize }; + + sws_scale(f.pre_filter_context, src2, src2_linesize, 0, h, dst2, dst2_linesize); + +#define UPDATE_FACTOR do { \ + int factor; \ + factor = f.color_diff_coeff[COLOR_DIFF_COEFF_SIZE/2 + pre_val - \ + f.pre_filter_buf[ix + iy*f.pre_filter_linesize]] * f.dist_coeff[dx + dy*f.dist_linesize]; \ + sum += src[ix + iy*src_linesize] * factor; \ + div += factor; \ + } while (0) + + for (y = 0; y < h; y++) { + for (x = 0; x < w; x++) { + int sum = 0; + int div = 0; + int dy; + const int pre_val = f.pre_filter_buf[x + y*f.pre_filter_linesize]; + if (x >= radius && x < w - radius) { + for (dy = 0; dy < radius*2 + 1; dy++) { + int dx; + int iy = y+dy - radius; + iy = avpriv_mirror(iy, h-1); + + for (dx = 0; dx < radius*2 + 1; dx++) { + const int ix = x+dx - radius; + UPDATE_FACTOR; + } + } + } else { + for (dy = 0; dy < radius*2+1; dy++) { + int dx; + int iy = y+dy - radius; + iy = avpriv_mirror(iy, h-1); + + for (dx = 0; dx < radius*2 + 1; dx++) { + int ix = x+dx - radius; + ix = avpriv_mirror(ix, w-1); + UPDATE_FACTOR; + } + } + } + dst[x + y*dst_linesize] = (sum + div/2) / div; + } + } +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) +{ + SabContext *sab = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + AVFrame *outpic; + + outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!outpic) { + av_frame_free(&inpic); + return AVERROR(ENOMEM); + } + av_frame_copy_props(outpic, inpic); + + blur(outpic->data[0], outpic->linesize[0], inpic->data[0], inpic->linesize[0], + inlink->w, inlink->h, &sab->luma); + if (inpic->data[2]) { + int cw = FF_CEIL_RSHIFT(inlink->w, sab->hsub); + int ch = FF_CEIL_RSHIFT(inlink->h, sab->vsub); + blur(outpic->data[1], outpic->linesize[1], inpic->data[1], inpic->linesize[1], cw, ch, &sab->chroma); + blur(outpic->data[2], outpic->linesize[2], inpic->data[2], inpic->linesize[2], cw, ch, &sab->chroma); + } + + av_frame_free(&inpic); + return ff_filter_frame(outlink, outpic); +} + +static const AVFilterPad sab_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + .config_props = config_props, + }, + { NULL } +}; + +static const AVFilterPad sab_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { NULL } +}; + +AVFilter ff_vf_sab = { + .name = "sab", + .description = NULL_IF_CONFIG_SMALL("Apply shape adaptive blur."), + .priv_size = sizeof(SabContext), + .init = init, + .uninit = uninit, + .query_formats = query_formats, + .inputs = sab_inputs, + .outputs = sab_outputs, + .priv_class = &sab_class, + .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, +}; 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