summaryrefslogtreecommitdiff
path: root/libavfilter/vf_smartblur.c
diff options
context:
space:
mode:
Diffstat (limited to 'libavfilter/vf_smartblur.c')
-rw-r--r--libavfilter/vf_smartblur.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/libavfilter/vf_smartblur.c b/libavfilter/vf_smartblur.c
new file mode 100644
index 0000000000..c3b12d9e40
--- /dev/null
+++ b/libavfilter/vf_smartblur.c
@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2012 Jeremy Tran
+ *
+ * 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 smartblur filter to the input video
+ * Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer.
+ */
+
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libswscale/swscale.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+
+#define RADIUS_MIN 0.1
+#define RADIUS_MAX 5.0
+
+#define STRENGTH_MIN -1.0
+#define STRENGTH_MAX 1.0
+
+#define THRESHOLD_MIN -30
+#define THRESHOLD_MAX 30
+
+typedef struct {
+ float radius;
+ float strength;
+ int threshold;
+ float quality;
+ struct SwsContext *filter_context;
+} FilterParam;
+
+typedef struct {
+ const AVClass *class;
+ FilterParam luma;
+ FilterParam chroma;
+ int hsub;
+ int vsub;
+ unsigned int sws_flags;
+} SmartblurContext;
+
+#define OFFSET(x) offsetof(SmartblurContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption smartblur_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_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 },
+ { "luma_threshold", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS },
+ { "lt", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_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_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 },
+ { "chroma_threshold", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
+ { "ct", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
+
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(smartblur);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ SmartblurContext *s = ctx->priv;
+
+ /* make chroma default to luma values, if not explicitly set */
+ if (s->chroma.radius < RADIUS_MIN)
+ s->chroma.radius = s->luma.radius;
+ if (s->chroma.strength < STRENGTH_MIN)
+ s->chroma.strength = s->luma.strength;
+ if (s->chroma.threshold < THRESHOLD_MIN)
+ s->chroma.threshold = s->luma.threshold;
+
+ s->luma.quality = s->chroma.quality = 3.0;
+ s->sws_flags = SWS_BICUBIC;
+
+ av_log(ctx, AV_LOG_VERBOSE,
+ "luma_radius:%f luma_strength:%f luma_threshold:%d "
+ "chroma_radius:%f chroma_strength:%f chroma_threshold:%d\n",
+ s->luma.radius, s->luma.strength, s->luma.threshold,
+ s->chroma.radius, s->chroma.strength, s->chroma.threshold);
+
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ SmartblurContext *s = ctx->priv;
+
+ sws_freeContext(s->luma.filter_context);
+ sws_freeContext(s->chroma.filter_context);
+}
+
+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_YUV440P,
+ AV_PIX_FMT_GRAY8,
+ 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);
+}
+
+static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags)
+{
+ SwsVector *vec;
+ SwsFilter sws_filter;
+
+ vec = sws_getGaussianVec(f->radius, f->quality);
+
+ if (!vec)
+ return AVERROR(EINVAL);
+
+ sws_scaleVec(vec, f->strength);
+ vec->coeff[vec->length / 2] += 1.0 - f->strength;
+ sws_filter.lumH = sws_filter.lumV = vec;
+ sws_filter.chrH = sws_filter.chrV = NULL;
+ f->filter_context = sws_getCachedContext(NULL,
+ width, height, AV_PIX_FMT_GRAY8,
+ width, height, AV_PIX_FMT_GRAY8,
+ flags, &sws_filter, NULL, NULL);
+
+ sws_freeVec(vec);
+
+ if (!f->filter_context)
+ return AVERROR(EINVAL);
+
+ return 0;
+}
+
+static int config_props(AVFilterLink *inlink)
+{
+ SmartblurContext *s = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+
+ s->hsub = desc->log2_chroma_w;
+ s->vsub = desc->log2_chroma_h;
+
+ alloc_sws_context(&s->luma, inlink->w, inlink->h, s->sws_flags);
+ alloc_sws_context(&s->chroma,
+ FF_CEIL_RSHIFT(inlink->w, s->hsub),
+ FF_CEIL_RSHIFT(inlink->h, s->vsub),
+ s->sws_flags);
+
+ return 0;
+}
+
+static void blur(uint8_t *dst, const int dst_linesize,
+ const uint8_t *src, const int src_linesize,
+ const int w, const int h, const int threshold,
+ struct SwsContext *filter_context)
+{
+ int x, y;
+ int orig, filtered;
+ int diff;
+ /* Declare arrays of 4 to get aligned data */
+ const uint8_t* const src_array[4] = {src};
+ uint8_t *dst_array[4] = {dst};
+ int src_linesize_array[4] = {src_linesize};
+ int dst_linesize_array[4] = {dst_linesize};
+
+ sws_scale(filter_context, src_array, src_linesize_array,
+ 0, h, dst_array, dst_linesize_array);
+
+ if (threshold > 0) {
+ for (y = 0; y < h; ++y) {
+ for (x = 0; x < w; ++x) {
+ orig = src[x + y * src_linesize];
+ filtered = dst[x + y * dst_linesize];
+ diff = orig - filtered;
+
+ if (diff > 0) {
+ if (diff > 2 * threshold)
+ dst[x + y * dst_linesize] = orig;
+ else if (diff > threshold)
+ /* add 'diff' and subtract 'threshold' from 'filtered' */
+ dst[x + y * dst_linesize] = orig - threshold;
+ } else {
+ if (-diff > 2 * threshold)
+ dst[x + y * dst_linesize] = orig;
+ else if (-diff > threshold)
+ /* add 'diff' and 'threshold' to 'filtered' */
+ dst[x + y * dst_linesize] = orig + threshold;
+ }
+ }
+ }
+ } else if (threshold < 0) {
+ for (y = 0; y < h; ++y) {
+ for (x = 0; x < w; ++x) {
+ orig = src[x + y * src_linesize];
+ filtered = dst[x + y * dst_linesize];
+ diff = orig - filtered;
+
+ if (diff > 0) {
+ if (diff <= -threshold)
+ dst[x + y * dst_linesize] = orig;
+ else if (diff <= -2 * threshold)
+ /* subtract 'diff' and 'threshold' from 'orig' */
+ dst[x + y * dst_linesize] = filtered - threshold;
+ } else {
+ if (diff >= threshold)
+ dst[x + y * dst_linesize] = orig;
+ else if (diff >= 2 * threshold)
+ /* add 'threshold' and subtract 'diff' from 'orig' */
+ dst[x + y * dst_linesize] = filtered + threshold;
+ }
+ }
+ }
+ }
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
+{
+ SmartblurContext *s = inlink->dst->priv;
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+ AVFrame *outpic;
+ int cw = FF_CEIL_RSHIFT(inlink->w, s->hsub);
+ int ch = FF_CEIL_RSHIFT(inlink->h, s->vsub);
+
+ 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, s->luma.threshold,
+ s->luma.filter_context);
+
+ if (inpic->data[2]) {
+ blur(outpic->data[1], outpic->linesize[1],
+ inpic->data[1], inpic->linesize[1],
+ cw, ch, s->chroma.threshold,
+ s->chroma.filter_context);
+ blur(outpic->data[2], outpic->linesize[2],
+ inpic->data[2], inpic->linesize[2],
+ cw, ch, s->chroma.threshold,
+ s->chroma.filter_context);
+ }
+
+ av_frame_free(&inpic);
+ return ff_filter_frame(outlink, outpic);
+}
+
+static const AVFilterPad smartblur_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ .config_props = config_props,
+ },
+ { NULL }
+};
+
+static const AVFilterPad smartblur_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_smartblur = {
+ .name = "smartblur",
+ .description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."),
+ .priv_size = sizeof(SmartblurContext),
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = smartblur_inputs,
+ .outputs = smartblur_outputs,
+ .priv_class = &smartblur_class,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-07 15:04:42 +0000