[FFmpeg-devel] [PATCH] lavfi: add smartblur filter
Jérémy Tran
tran.jeremy.av at gmail.com
Mon Aug 27 17:08:44 CEST 2012
This is a port of the MPlayer smartblur filter (libmpcodecs/vf_smartblur.c)
by Michael Niedermayer.
The code got relicensed with the original author permission.
---
doc/filters.texi | 26 ++++
libavfilter/Makefile | 2 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_smartblur.c | 305 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 334 insertions(+)
create mode 100644 libavfilter/vf_smartblur.c
diff --git a/doc/filters.texi b/doc/filters.texi
index bef95f7..fce45d4 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3253,6 +3253,32 @@ not specified it will use the default value of 16.
Adding this in the beginning of filter chains should make filtering
faster due to better use of the memory cache.
+ at section smartblur
+
+Blur the input video without impacting the outlines.
+
+The filter accepts the following parameters:
+ at var{luma_radius}:@var{luma_strength}:@var{luma_threshold}[:@var{chroma_radius}:@var{chroma_strength}:@var{chroma_threshold}]
+
+Parameters prefixed by @var{luma} indicate that it work on the luminance of the
+pixels whereas parameters prefixed by @var{chroma} refer to the chrominance of
+the pixels.
+
+If the chroma parameters are not set, the luma parameters are used for
+either the luminance and the chrominance of the pixels.
+
+ at var{luma_radius} or @var{chroma_radius} must be a float number in the range [0.1,5.0] that specifies
+the variance of the gaussian filter used to blur the image (slower if larger).
+
+ at var{luma_strength} or @var{chroma_strength} must be a float number in the range [-1.0,1.0] that
+configures the blurring. A value included in [0.0,1.0] will blur the image
+whereas a value included in [-1.0,0.0] will sharpen the image.
+
+ at var{luma_threshold} or @var{chroma_threshold} must be an integer in the range [-30,30] that is used as a
+coefficient to determine whether a pixel should be blurred or not. A value of
+0 will filter all the image, a value included in [0-30] will filter flat areas
+and a value included in [-30,0] will filter edges.
+
@section split
Split input video into several identical outputs.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 3270232..6b3ab86 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -14,6 +14,7 @@ FFLIBS-$(CONFIG_MOVIE_FILTER) += avformat avcodec
FFLIBS-$(CONFIG_PAN_FILTER) += swresample
FFLIBS-$(CONFIG_REMOVELOGO_FILTER) += avformat avcodec
FFLIBS-$(CONFIG_MP_FILTER) += avcodec postproc
+FFLIBS-$(CONFIG_SMARTBLUR_FILTER) += swscale
HEADERS = asrc_abuffer.h \
avcodec.h \
@@ -125,6 +126,7 @@ OBJS-$(CONFIG_SETSAR_FILTER) += vf_aspect.o
OBJS-$(CONFIG_SETTB_FILTER) += f_settb.o
OBJS-$(CONFIG_SHOWINFO_FILTER) += vf_showinfo.o
OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
+OBJS-$(CONFIG_SMARTBLUR_FILTER) += vf_smartblur.o
OBJS-$(CONFIG_SPLIT_FILTER) += split.o
OBJS-$(CONFIG_SUPER2XSAI_FILTER) += vf_super2xsai.o
OBJS-$(CONFIG_SWAPUV_FILTER) += vf_swapuv.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 0bc5a4a..cd9bef8 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -116,6 +116,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (SETTB, settb, vf);
REGISTER_FILTER (SHOWINFO, showinfo, vf);
REGISTER_FILTER (SLICIFY, slicify, vf);
+ REGISTER_FILTER (SMARTBLUR, smartblur, vf);
REGISTER_FILTER (SPLIT, split, vf);
REGISTER_FILTER (SUPER2XSAI, super2xsai, vf);
REGISTER_FILTER (SWAPUV, swapuv, vf);
diff --git a/libavfilter/vf_smartblur.c b/libavfilter/vf_smartblur.c
new file mode 100644
index 0000000..6914254
--- /dev/null
+++ b/libavfilter/vf_smartblur.c
@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) 2002 Michael Niedermayer <michaelni at 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/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 {
+ FilterParam luma;
+ FilterParam chroma;
+ int hsub;
+ int vsub;
+ unsigned int flags; // sws flags
+} SmartblurContext;
+
+#define CHECK_PARAM(param, name, min, max, format, ret) \
+ if (param < min || param > max) { \
+ av_log(ctx, AV_LOG_ERROR, \
+ "Invalid " #name " value " #format ": " \
+ "must be included between range " #format " and " #format "\n",\
+ param, min, max); \
+ ret = AVERROR(EINVAL); \
+ }
+
+static av_cold int init(AVFilterContext *ctx, const char *args)
+{
+ SmartblurContext *sblur = ctx->priv;
+ int n = 0, ret = 0;
+ float lradius, lstrength, cradius, cstrength;
+ int lthreshold, cthreshold;
+
+ if (args)
+ n = sscanf(args, "%f:%f:%d:%f:%f:%d",
+ &lradius,
+ &lstrength,
+ <hreshold,
+ &cradius,
+ &cstrength,
+ &cthreshold);
+
+ if (n != 3 && n != 6) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Incorrect number of parameters or invalid syntax: "
+ "must be luma_radius:luma_strength:luma_threshold"
+ "[:chroma_radius:chroma_strength:chroma_threshold]\n");
+ return AVERROR(EINVAL);
+ }
+
+ sblur->luma.radius = lradius;
+ sblur->luma.strength = lstrength;
+ sblur->luma.threshold = lthreshold;
+
+ if (n == 3) {
+ sblur->chroma.radius = sblur->luma.radius;
+ sblur->chroma.strength = sblur->luma.strength;
+ sblur->chroma.threshold = sblur->luma.threshold;
+ } else {
+ sblur->chroma.radius = cradius;
+ sblur->chroma.strength = cstrength;
+ sblur->chroma.threshold = cthreshold;
+ }
+
+ sblur->luma.quality = sblur->chroma.quality = 3.0;
+ sblur->flags = SWS_BICUBIC;
+
+ CHECK_PARAM(lradius, luma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret)
+ CHECK_PARAM(lstrength, luma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret)
+ CHECK_PARAM(lthreshold, luma threshold, THRESHOLD_MIN, THRESHOLD_MAX, %d, ret)
+
+ if (n != 3) {
+ CHECK_PARAM(sblur->chroma.radius, chroma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret)
+ CHECK_PARAM(sblur->chroma.strength, chroma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret)
+ CHECK_PARAM(sblur->chroma.threshold, chroma threshold, THRESHOLD_MIN,THRESHOLD_MAX, %d, ret)
+ }
+
+ return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ SmartblurContext *sblur = ctx->priv;
+
+ sws_freeContext(sblur->luma.filter_context);
+ sws_freeContext(sblur->chroma.filter_context);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum PixelFormat pix_fmts[] = {
+ PIX_FMT_YUV444P, PIX_FMT_YUV422P,
+ PIX_FMT_YUV420P, PIX_FMT_YUV411P,
+ PIX_FMT_YUV410P, PIX_FMT_YUV440P,
+ PIX_FMT_GRAY8,
+ PIX_FMT_NONE
+ };
+
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+
+ return 0;
+}
+
+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, PIX_FMT_GRAY8,
+ width, height, 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 *sblur = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format];
+
+ sblur->hsub = desc->log2_chroma_w;
+ sblur->vsub = desc->log2_chroma_h;
+
+ alloc_sws_context(&sblur->luma, inlink->w, inlink->h, sblur->flags);
+ alloc_sws_context(&sblur->chroma, inlink->w >> sblur->hsub, inlink->h >> sblur->vsub, sblur->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 substract '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)
+ /* substract '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 substract 'diff' from 'orig' */
+ dst[x + y * dst_linesize] = filtered + threshold;
+ }
+ }
+ }
+ }
+}
+
+static int end_frame(AVFilterLink *inlink)
+{
+ SmartblurContext *sblur = inlink->dst->priv;
+ AVFilterBufferRef *inpic = inlink->cur_buf;
+ AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
+ int cw = inlink->w >> sblur->hsub;
+ int ch = inlink->h >> sblur->vsub;
+
+ blur(outpic->data[0], outpic->linesize[0],
+ inpic->data[0], inpic->linesize[0],
+ inlink->w, inlink->h, sblur->luma.threshold,
+ sblur->luma.filter_context);
+
+ if (inpic->data[2]) {
+ blur(outpic->data[1], outpic->linesize[1],
+ inpic->data[1], inpic->linesize[1],
+ cw, ch, sblur->chroma.threshold,
+ sblur->chroma.filter_context);
+ blur(outpic->data[2], outpic->linesize[2],
+ inpic->data[2], inpic->linesize[2],
+ cw, ch, sblur->chroma.threshold,
+ sblur->chroma.filter_context);
+ }
+
+ return ff_end_frame(inlink->dst->outputs[0]);
+}
+
+AVFilter avfilter_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 = (const AVFilterPad[]) {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .end_frame = end_frame,
+ .config_props = config_props,
+ .min_perms = AV_PERM_READ,
+ },
+ { .name = NULL }
+ },
+ .outputs = (const AVFilterPad[]) {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { .name = NULL }
+ }
+};
--
1.7.11.3
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