[FFmpeg-devel] [PATCH] lavfi: port sab filter from libmpcodecs
Stefano Sabatini
stefasab at gmail.com
Mon Jun 3 15:02:18 CEST 2013
---
LICENSE | 1 +
configure | 1 +
doc/filters.texi | 34 +++++
libavfilter/Makefile | 2 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_sab.c | 336 ++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 375 insertions(+)
create mode 100644 libavfilter/vf_sab.c
diff --git a/LICENSE b/LICENSE
index 088f8dc..a4b4006 100644
--- a/LICENSE
+++ b/LICENSE
@@ -40,6 +40,7 @@ Specifically, the GPL parts of FFmpeg are
- vf_noise.c
- vf_owdenoise.c
- vf_pp.c
+ - vf_sab.c
- vf_smartblur.c
- vf_stereo3d.c
- vf_super2xsai.c
diff --git a/configure b/configure
index 0accc12..93970a1 100755
--- a/configure
+++ b/configure
@@ -2168,6 +2168,7 @@ owdenoise_filter_deps="gpl"
pan_filter_deps="swresample"
pp_filter_deps="gpl postproc"
removelogo_filter_deps="avcodec avformat swscale"
+sab_filter_deps="gpl swscale"
scale_filter_deps="swscale"
smartblur_filter_deps="gpl swscale"
showspectrum_filter_deps="avcodec rdft"
diff --git a/doc/filters.texi b/doc/filters.texi
index 1cfcf17..56e5434 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -5772,6 +5772,40 @@ much, but it will increase the amount of blurring needed to cover over
the image and will destroy more information than necessary, and extra
pixels will slow things down on a large logo.
+ at section sab
+
+Apply Shape Adaptive Blur.
+
+The filter accepts the following options:
+
+ at table @option
+ at item luma_radius, lr
+Set luma blur filter strength, must be a value in range 0.1-4.0, default
+value is 1.0. A greater value will result in a more blurred image, and
+in slower processing.
+
+ at item luma_pre_filter_radius, lpfr
+Set luma prefilter radius, must be a value in the 0.1-2.0 range, default
+value is 1.0.
+
+ at item luma_strength, ls
+Set luma maximum difference between pixels to still be considered, must
+be a value in the 0.1-100.0 range, default value is 1.0.
+
+ at item chroma_radius, cr
+Set chroma blur filter strength, must be a value in range 0.1-4.0, default
+value is 1.0. A greater value will result in a more blurred image, and
+in slower processing.
+
+ at item chroma_pre_filter_radius, cpfr
+Set chroma prefilter radius, must be a value in the 0.1-2.0 range, default
+value is 1.0.
+
+ at item chroma_strength, cs
+Set chroma maximum difference between pixels to still be considered,
+must be a value in the 0.1-100.0 range, default value is 1.0.
+ at end table
+
@section scale
Scale (resize) the input video, using the libswscale library.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 9cda4fa..839b519 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -16,6 +16,7 @@ FFLIBS-$(CONFIG_PAN_FILTER) += swresample
FFLIBS-$(CONFIG_PP_FILTER) += postproc
FFLIBS-$(CONFIG_REMOVELOGO_FILTER) += avformat avcodec swscale
FFLIBS-$(CONFIG_RESAMPLE_FILTER) += avresample
+FFLIBS-$(CONFIG_SAB_FILTER) += swscale
FFLIBS-$(CONFIG_SCALE_FILTER) += swscale
FFLIBS-$(CONFIG_SHOWSPECTRUM_FILTER) += avcodec
FFLIBS-$(CONFIG_SMARTBLUR_FILTER) += swscale
@@ -168,6 +169,7 @@ OBJS-$(CONFIG_PIXDESCTEST_FILTER) += vf_pixdesctest.o
OBJS-$(CONFIG_PP_FILTER) += vf_pp.o
OBJS-$(CONFIG_REMOVELOGO_FILTER) += bbox.o lswsutils.o lavfutils.o vf_removelogo.o
OBJS-$(CONFIG_SEPARATEFIELDS_FILTER) += vf_separatefields.o
+OBJS-$(CONFIG_SAB_FILTER) += vf_sab.o
OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o
OBJS-$(CONFIG_SELECT_FILTER) += f_select.o
OBJS-$(CONFIG_SENDCMD_FILTER) += f_sendcmd.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index a60a55e..f9d9391 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -163,6 +163,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(PIXDESCTEST, pixdesctest, vf);
REGISTER_FILTER(PP, pp, vf);
REGISTER_FILTER(REMOVELOGO, removelogo, vf);
+ REGISTER_FILTER(SAB, sab, vf);
REGISTER_FILTER(SCALE, scale, vf);
REGISTER_FILTER(SELECT, select, vf);
REGISTER_FILTER(SENDCMD, sendcmd, vf);
diff --git a/libavfilter/vf_sab.c b/libavfilter/vf_sab.c
new file mode 100644
index 0000000..cbefeda
--- /dev/null
+++ b/libavfilter/vf_sab.c
@@ -0,0 +1,336 @@
+/*
+ * Copyright (c) 2002 Michael Niedermayer <michaelni at 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
+ };
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+
+ return 0;
+}
+
+#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 free_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;
+
+ free_filter_param(&sab->luma);
+ free_filter_param(&sab->chroma);
+}
+
+static int alloc_sws_context(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(f->dist_width * f->dist_linesize * sizeof(int32_t));
+ if (!f->dist_coeff)
+ 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;
+
+ ret = alloc_sws_context(&sab->luma, inlink->w, inlink->h, sab->sws_flags);
+ if (ret < 0)
+ return ret;
+
+ ret = alloc_sws_context(&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 { \
+ 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;
+ if (iy < 0) iy = -iy;
+ else if (iy >= h) iy = h+h-iy-1;
+
+ for (dx = 0; dx < radius*2+1; dx++) {
+ const int ix = x+dx - radius;
+ int factor;
+ UPDATE_FACTOR;
+ }
+ }
+ } else {
+ for (dy = 0; dy < radius*2+1; dy++) {
+ int dx;
+ int iy = y+dy - radius;
+ if (iy < 0) iy = -iy;
+ else if (iy >= h) iy = h+h-iy-1;
+
+ for (dx = 0; dx < radius*2+1; dx++) {
+ int ix = x+dx - radius;
+ int factor;
+ if (ix < 0) ix = -ix;
+ else if (ix >= w) ix = w+w-ix-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 avfilter_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,
+};
--
1.7.9.5
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