[FFmpeg-devel] [PATCH] avfilter: add morpho filter
Paul B Mahol
onemda at gmail.com
Mon Sep 20 20:33:59 EEST 2021
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 32 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_morpho.c | 865 +++++++++++++++++++++++++++++++++++++++
4 files changed, 899 insertions(+)
create mode 100644 libavfilter/vf_morpho.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 0c45fb710d..b46556c12c 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -10225,6 +10225,7 @@ A number representing position of the first frame with respect to the telecine
pattern. This is to be used if the stream is cut. The default value is @code{0}.
@end table
+ at anchor{dilation}
@section dilation
Apply dilation effect to the video.
@@ -11541,6 +11542,7 @@ value.
@end table
+ at anchor{erosion}
@section erosion
Apply erosion effect to the video.
@@ -15316,6 +15318,36 @@ Default value is 0.
This filter supports the all above options as @ref{commands}.
+ at section morpho
+
+This filter allows to apply main morphological grayscale transforms,
+erode and dilate with arbitrary structures set in second input stream.
+
+Unlike naive implementation and much slower performance in @ref{erosion}
+and @ref{dilation} filters, when speed is critical @code{morpho} filter
+should be used instead.
+
+A description of accepted options follows,
+
+ at table @option
+ at item mode
+Set morphological transform to apply, can be @code{erode} or @code{dilate}.
+Default is @code{erode}.
+
+ at item planes
+Set planes to filter, by default all planes except alpha are filtered.
+
+ at item structure
+Set which structure video frames will be processed from second input stream,
+can be @var{first} or @var{all}. Default is @var{all}.
+ at end table
+
+The @code{morpho} filter also supports the @ref{framesync} options.
+
+ at subsection Commands
+
+This filter supports same @ref{commands} as options.
+
@section mpdecimate
Drop frames that do not differ greatly from the previous frame in
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 272f876c07..06e01da38e 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -350,6 +350,7 @@ OBJS-$(CONFIG_MIDEQUALIZER_FILTER) += vf_midequalizer.o framesync.o
OBJS-$(CONFIG_MINTERPOLATE_FILTER) += vf_minterpolate.o motion_estimation.o
OBJS-$(CONFIG_MIX_FILTER) += vf_mix.o framesync.o
OBJS-$(CONFIG_MONOCHROME_FILTER) += vf_monochrome.o
+OBJS-$(CONFIG_MORPHO_FILTER) += vf_morpho.o
OBJS-$(CONFIG_MPDECIMATE_FILTER) += vf_mpdecimate.o
OBJS-$(CONFIG_NEGATE_FILTER) += vf_lut.o
OBJS-$(CONFIG_NLMEANS_FILTER) += vf_nlmeans.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 1283d124b8..10dfe72131 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -335,6 +335,7 @@ extern const AVFilter ff_vf_midequalizer;
extern const AVFilter ff_vf_minterpolate;
extern const AVFilter ff_vf_mix;
extern const AVFilter ff_vf_monochrome;
+extern const AVFilter ff_vf_morpho;
extern const AVFilter ff_vf_mpdecimate;
extern const AVFilter ff_vf_msad;
extern const AVFilter ff_vf_negate;
diff --git a/libavfilter/vf_morpho.c b/libavfilter/vf_morpho.c
new file mode 100644
index 0000000000..46c641c4b9
--- /dev/null
+++ b/libavfilter/vf_morpho.c
@@ -0,0 +1,865 @@
+/*
+ * Copyright (c) 2016 ReneBrals
+ * Copyright (c) 2021 Paul B Mahol
+ *
+ * This file is part of FFmpeg.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "video.h"
+#include "framesync.h"
+
+typedef struct IPlane {
+ uint8_t **img;
+ size_t W;
+ size_t H;
+ size_t range;
+ int type_size;
+
+ void (*max)(uint8_t *c, uint8_t *a, uint8_t *b, size_t x);
+ void (*min)(uint8_t *c, uint8_t *a, uint8_t *b, size_t x);
+ void (*max_in_place)(uint8_t *a, uint8_t *b, size_t x);
+ void (*min_in_place)(uint8_t *a, uint8_t *b, size_t x);
+} IPlane;
+
+typedef struct LUT {
+ uint8_t ***arr;
+ int minR;
+ int maxR;
+ size_t I;
+ size_t X;
+ int padX;
+} LUT;
+
+typedef struct chord {
+ int x;
+ int y;
+ int l;
+ int i;
+} chord;
+
+typedef struct chordSet {
+ chord *C;
+ size_t size;
+ size_t cap;
+
+ int *R;
+ size_t Lnum;
+
+ int minX;
+ int maxX;
+ int minY;
+ int maxY;
+} chordSet;
+
+typedef struct MorphoContext {
+ const AVClass *class;
+ FFFrameSync fs;
+
+ chordSet SE[4];
+ IPlane SEimg[4];
+ IPlane g[4], f[4];
+ LUT Ty[4];
+
+ int mode;
+ int planes;
+ int structures;
+
+ int planewidth[4];
+ int planeheight[4];
+ int splanewidth[4];
+ int splaneheight[4];
+ int depth;
+ int type_size;
+ int nb_planes;
+
+ int got_structure[4];
+} MorphoContext;
+
+#define OFFSET(x) offsetof(MorphoContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
+
+static const AVOption morpho_options[] = {
+ { "mode", "set morphological transform", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "mode" },
+ { "erode", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
+ { "dilate", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
+ { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=7}, 0, 15, FLAGS },
+ { "structure", "when to process structures", OFFSET(structures), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "str" },
+ { "first", "process only first structure, ignore rest", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "str" },
+ { "all", "process all structure", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "str" },
+ { NULL }
+};
+
+FRAMESYNC_DEFINE_CLASS(morpho, MorphoContext, fs);
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
+ AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
+ AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
+ AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
+ AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
+ AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
+ AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9, AV_PIX_FMT_GBRP9,
+ AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
+ AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
+ AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
+ AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
+ AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
+ AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
+ AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
+ AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
+ AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
+ AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
+ AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
+ AV_PIX_FMT_NONE
+ };
+
+ return ff_set_common_formats_from_list(ctx, pix_fmts);
+}
+
+static void Min(uint8_t *c, uint8_t *a, uint8_t *b, size_t x)
+{
+ for (size_t i = 0; i < x; i++)
+ c[i] = FFMIN(b[i], a[i]);
+}
+
+static void MinInPlace(uint8_t *a, uint8_t *b, size_t x)
+{
+ for (size_t i = 0; i < x; i++)
+ a[i] = FFMIN(a[i], b[i]);
+}
+
+static void Max(uint8_t *c, uint8_t *a, uint8_t *b, size_t x)
+{
+ for (size_t i = 0; i < x; i++)
+ c[i] = FFMAX(a[i], b[i]);
+}
+
+static void MaxInPlace(uint8_t *a, uint8_t *b, size_t x)
+{
+ for (size_t i = 0; i < x; i++)
+ a[i] = FFMAX(a[i], b[i]);
+}
+
+static void Min16(uint8_t *cc, uint8_t *aa, uint8_t *bb, size_t x)
+{
+ uint16_t *a = (uint16_t *)aa;
+ uint16_t *b = (uint16_t *)bb;
+ uint16_t *c = (uint16_t *)cc;
+
+ for (size_t i = 0; i < x; i++)
+ c[i] = FFMIN(b[i], a[i]);
+}
+
+static void MinInPlace16(uint8_t *aa, uint8_t *bb, size_t x)
+{
+ uint16_t *a = (uint16_t *)aa;
+ uint16_t *b = (uint16_t *)bb;
+
+ for (size_t i = 0; i < x; i++)
+ a[i] = FFMIN(a[i], b[i]);
+}
+
+static void Max16(uint8_t *cc, uint8_t *aa, uint8_t *bb, size_t x)
+{
+ uint16_t *a = (uint16_t *)aa;
+ uint16_t *b = (uint16_t *)bb;
+ uint16_t *c = (uint16_t *)cc;
+
+ for (size_t i = 0; i < x; i++)
+ c[i] = FFMAX(a[i], b[i]);
+}
+
+static void MaxInPlace16(uint8_t *aa, uint8_t *bb, size_t x)
+{
+ uint16_t *a = (uint16_t *)aa;
+ uint16_t *b = (uint16_t *)bb;
+
+ for (size_t i = 0; i < x; i++)
+ a[i] = FFMAX(a[i], b[i]);
+}
+
+static int allocateLUT(LUT *Ty, chordSet SE, int type_size)
+{
+ size_t prePadX = 0;
+
+ /*
+ * The LUT is pre-padded on X. This is needed for dilation, where the
+ * padding might contain valid information.
+ */
+ if (SE.minX < 0)
+ prePadX = 0 - SE.minX;
+ Ty->padX = prePadX;
+
+ Ty->arr = av_calloc((Ty->maxR - Ty->minR + 1), sizeof(uint8_t **));
+ if (!Ty->arr)
+ return AVERROR(ENOMEM);
+ for (int r = 0; r < (Ty->maxR - Ty->minR + 1); r++) {
+ Ty->arr[r] = av_calloc(Ty->I, sizeof(uint8_t *));
+ if (!Ty->arr[r])
+ return AVERROR(ENOMEM);
+ for (int i = 0; i < Ty->I; i++) {
+ Ty->arr[r][i] = av_calloc(Ty->X + prePadX, type_size);
+ if (!Ty->arr[r][i])
+ return AVERROR(ENOMEM);
+ /* Shifting the X index such that negative indices correspond to
+ * the pre-padding.
+ */
+ Ty->arr[r][i] = &(Ty->arr[r][i][prePadX * type_size]);
+ }
+ }
+
+ Ty->arr = &(Ty->arr[0 - Ty->minR]);
+
+ return 0;
+}
+
+static void freeLUT(LUT *table, int type_size)
+{
+ uint8_t ***rp;
+
+ if (!table->arr)
+ return;
+
+ // The R index was shifted, create a pointer to the original array
+ rp = &(table->arr[table->minR]);
+
+ for (int r = table->minR; r <= table->maxR; r++) {
+ for (int i = 0; i < table->I; i++) {
+ // The X index was also shifted, for padding purposes.
+ av_free(table->arr[r][i] - table->padX * type_size);
+ }
+ av_freep(&table->arr[r]);
+ }
+ av_freep(&rp);
+}
+
+static void circularSwapPointers(LUT Ty)
+{
+ uint8_t **Ty0;
+ int r;
+
+ /*
+ * Swap the pointers to r-indices in a circle. This is useful because
+ * Ty(r,i,x) = Ty-1(r+1,i,x) for r < ymax.
+ */
+ if (Ty.maxR - Ty.minR > 0) {
+ Ty0 = Ty.arr[Ty.minR];
+
+ for (r = Ty.minR; r < Ty.maxR; r++) {
+ Ty.arr[r] = Ty.arr[r + 1];
+ }
+
+ r = Ty.maxR;
+ Ty.arr[r] = Ty0;
+ }
+}
+
+static void computeMinRow(IPlane f, LUT *Ty, chordSet SE, int r, size_t y)
+{
+ if (y + r > 0 && y + r < f.H) {
+ memcpy(Ty->arr[r][0], f.img[y + r], Ty->X * f.type_size);
+ } else {
+ memset(Ty->arr[r][0], UINT8_MAX, Ty->X * f.type_size);
+ }
+
+ for (int i = 1; i < SE.Lnum; i++) {
+ int d = SE.R[i] - SE.R[i - 1];
+ f.min(Ty->arr[r][i],
+ Ty->arr[r][i - 1],
+ Ty->arr[r][i - 1] + d * f.type_size,
+ FFMAX((int)Ty->X - (int)d, 0));
+ }
+}
+
+static void updateMinLUT(IPlane f, LUT *Ty, chordSet SE, size_t y, size_t tid, size_t num)
+{
+ for (size_t i = 0; i < num; i++)
+ circularSwapPointers(*Ty);
+
+ computeMinRow(f, Ty, SE, Ty->maxR - tid, y);
+}
+
+static int computeMinLUT(LUT *Ty, IPlane f, chordSet SE, size_t y, size_t num)
+{
+ if (Ty->I != SE.Lnum ||
+ Ty->X != f.W ||
+ Ty->minR != SE.minY ||
+ Ty->maxR != SE.maxY + num - 1) {
+ int ret;
+
+ freeLUT(Ty, f.type_size);
+
+ Ty->I = SE.Lnum;
+ Ty->X = f.W;
+ Ty->minR = SE.minY;
+ Ty->maxR = SE.maxY + num - 1;
+ ret = allocateLUT(Ty, SE, f.type_size);
+ if (ret < 0)
+ return ret;
+ }
+
+ for (int r = Ty->minR; r <= Ty->maxR; r++)
+ computeMinRow(f, Ty, SE, r, y);
+
+ return 0;
+}
+
+static void computeMaxRow(IPlane f, LUT *Ty, chordSet SE, int r, size_t y)
+{
+ if (y + r > 0 && y + r < f.H) {
+ memcpy(Ty->arr[r][0], f.img[y + r], Ty->X * f.type_size);
+ } else {
+ memset(Ty->arr[r][0], 0, Ty->X * f.type_size);
+ }
+
+ for (int i = 1; i < SE.Lnum; i++) {
+ int d = SE.R[i] - SE.R[i - 1];
+
+ f.max(Ty->arr[r][i] - Ty->padX * f.type_size,
+ Ty->arr[r][i - 1] - Ty->padX * f.type_size,
+ Ty->arr[r][i - 1] + (d - Ty->padX) * f.type_size,
+ Ty->X + Ty->padX - d);
+ memcpy(Ty->arr[r][i] + (Ty->X - d) * f.type_size,
+ Ty->arr[r][i - 1] + (Ty->X - d) * f.type_size,
+ d * f.type_size);
+ }
+}
+
+static void updateMaxLUT(IPlane f, LUT *Ty, chordSet SE, size_t y, size_t tid, size_t num)
+{
+ for (size_t i = 0; i < num; i++)
+ circularSwapPointers(*Ty);
+
+ computeMaxRow(f, Ty, SE, Ty->maxR - tid, y);
+}
+
+static int computeMaxLUT(LUT *Ty, IPlane f, chordSet SE, size_t y, size_t num)
+{
+ if (Ty->I != SE.Lnum ||
+ Ty->X != f.W ||
+ Ty->minR != SE.minY ||
+ Ty->maxR != SE.maxY + num - 1) {
+ int ret;
+
+ freeLUT(Ty, f.type_size);
+
+ Ty->I = SE.Lnum;
+ Ty->X = f.W;
+ Ty->minR = SE.minY;
+ Ty->maxR = SE.maxY + num - 1;
+ ret = allocateLUT(Ty, SE, f.type_size);
+ if (ret < 0)
+ return ret;
+ }
+
+ for (int r = Ty->minR; r <= Ty->maxR; r++)
+ computeMaxRow(f, Ty, SE, r, y);
+
+ return 0;
+}
+
+static void lineDilate(IPlane *g, LUT *Ty, chordSet SE, int y, size_t tid)
+{
+ memset(g->img[y], 0, g->W * g->type_size);
+
+ for (size_t c = 0; c < SE.size; c++) {
+ g->max_in_place(g->img[y],
+ Ty->arr[SE.C[c].y + tid][SE.C[c].i] + SE.C[c].x * g->type_size,
+ FFMIN(FFMAX((int)g->W - SE.C[c].x, 0), g->W));
+ }
+}
+
+static void lineErode(IPlane *g, LUT *Ty, chordSet SE, int y, size_t tid)
+{
+ memset(g->img[y], UINT8_MAX, g->W * g->type_size);
+
+ for (size_t c = 0; c < SE.size; c++) {
+ g->min_in_place(g->img[y],
+ Ty->arr[SE.C[c].y + tid][SE.C[c].i] + SE.C[c].x * g->type_size,
+ FFMIN(FFMAX((int)g->W - SE.C[c].x, 0), g->W));
+ }
+}
+
+static int dilate(IPlane *g, IPlane f, chordSet SE, LUT *Ty)
+{
+ int ret = computeMaxLUT(Ty, f, SE, 0, 1);
+ if (ret < 0)
+ return ret;
+
+ lineDilate(g, Ty, SE, 0, 0);
+ for (size_t y = 1; y < f.H; y++) {
+ updateMaxLUT(f, Ty, SE, y, 0, 1);
+ lineDilate(g, Ty, SE, y, 0);
+ }
+
+ return 0;
+}
+
+static int erode(IPlane *g, IPlane f, chordSet SE, LUT *Ty)
+{
+ int ret = computeMinLUT(Ty, f, SE, 0, 1);
+ if (ret < 0)
+ return ret;
+
+ lineErode(g, Ty, SE, 0, 0);
+ for (size_t y = 1; y < f.H; y++) {
+ updateMinLUT(f, Ty, SE, y, 0, 1);
+ lineErode(g, Ty, SE, y, 0);
+ }
+
+ return 0;
+}
+
+static void insertChordSet(chordSet *chords, chord c)
+{
+ // Checking if chord fits in dynamic array, resize if not.
+ if (chords->size == chords->cap) {
+ chords->C = av_realloc_f(chords->C, chords->cap * 2, sizeof(chord));
+ chords->cap *= 2;
+ }
+
+ // Add the chord to the dynamic array.
+ chords->C[chords->size].x = c.x;
+ chords->C[chords->size].y = c.y;
+ chords->C[chords->size++].l = c.l;
+
+ // Update minimum/maximum x/y offsets of the chord set.
+ if (c.x < chords->minX)
+ chords->minX = c.x;
+ if (c.x > chords->maxX)
+ chords->maxX = c.x;
+
+ if (c.y < chords->minY)
+ chords->minY = c.y;
+ if (c.y > chords->maxY)
+ chords->maxY = c.y;
+}
+
+static void freeChordSet(chordSet *SE)
+{
+ av_freep(&SE->C);
+ SE->size = 0;
+ SE->cap = 0;
+
+ av_freep(&SE->R);
+ SE->Lnum = 0;
+}
+
+static int init_chordset(chordSet *chords)
+{
+ chords->size = 0;
+ chords->C = av_calloc(1, sizeof(chord));
+ if (!chords->C)
+ return AVERROR(ENOMEM);
+
+ chords->cap = 1;
+ chords->minX = INT_MAX;
+ chords->maxX = INT_MIN;
+ chords->minY = INT_MAX;
+ chords->maxY = INT_MIN;
+
+ return 0;
+}
+
+static int compChordLength(const void *p, const void *q)
+{
+ chord a, b;
+ a = *((chord *)p);
+ b = *((chord *)q);
+
+ return (a.l > b.l) - (a.l < b.l);
+}
+
+static int compChordY(const void *p, const void *q)
+{
+ chord a, b;
+ a = *((chord *)p);
+ b = *((chord *)q);
+
+ return (a.y > b.y) - (a.y < b.y);
+}
+
+static int buildChordSet(IPlane SE, chordSet *chords)
+{
+ size_t i, chordLengthIndex, x, y;
+ int chordStart, val, ret;
+ chord c;
+
+ ret = init_chordset(chords);
+ if (ret < 0)
+ return ret;
+ /*
+ * In erosion/dilation, the center of the IPlane has S.E. offset (0,0).
+ * Otherwise, the resulting IPlane would be shifted to the top-left.
+ */
+ int centerX = (SE.W - 1) / 2;
+ int centerY = (SE.H - 1) / 2;
+
+ /*
+ * Computing the set of chords C.
+ */
+ for (y = 0; y < SE.H; y++) {
+ chordStart = -1;
+ for (x = 0; x < SE.W; x++) {
+ if (SE.type_size == 1) {
+ //A chord is a run of non-zero pixels.
+ if (SE.img[y][x] != 0 && chordStart == -1) {
+ // Chord starts.
+ chordStart = x;
+ } else if (SE.img[y][x] == 0 && chordStart != -1) {
+ // Chord ends before end of line.
+ c.x = chordStart - centerX;
+ c.y = y - centerY;
+ c.l = x - chordStart;
+ insertChordSet(chords, c);
+ chordStart = -1;
+ }
+ } else {
+ //A chord is a run of non-zero pixels.
+ if (AV_RN16(&SE.img[y][x * 2]) != 0 && chordStart == -1) {
+ // Chord starts.
+ chordStart = x;
+ } else if (AV_RN16(&SE.img[y][x + 2]) == 0 && chordStart != -1) {
+ // Chord ends before end of line.
+ c.x = chordStart - centerX;
+ c.y = y - centerY;
+ c.l = x - chordStart;
+ insertChordSet(chords, c);
+ chordStart = -1;
+ }
+ }
+ }
+ if (chordStart != -1) {
+ // Chord ends at end of line.
+ c.x = chordStart - centerX;
+ c.y = y - centerY;
+ c.l = x - chordStart;
+ insertChordSet(chords, c);
+ }
+ }
+
+ /*
+ * Computing the array of chord lengths R(i).
+ * This is needed because the lookup table will contain a row for each
+ * length index i.
+ */
+ qsort(chords->C, chords->size, sizeof(chord), compChordLength);
+ chords->R = av_calloc(1, sizeof(int));
+ chords->Lnum = 0;
+ val = 0;
+ size_t rCap = 1;
+
+ if (chords->size > 0) {
+ val = 1;
+ if (chords->Lnum >= rCap) {
+ chords->R = av_realloc_f(chords->R, rCap * 2, sizeof(int));
+ rCap *= 2;
+ }
+ chords->R[chords->Lnum++] = 1;
+ val = 1;
+ }
+
+ for (i = 0; i < chords->size; i++) {
+ if (val != chords->C[i].l) {
+ while (2 * val < chords->C[i].l && val != 0) {
+
+ if (chords->Lnum >= rCap) {
+ chords->R = av_realloc_f(chords->R, rCap * 2, sizeof(int));
+ rCap *= 2;
+ }
+ chords->R[chords->Lnum++] = 2 * val;
+ val *= 2;
+ }
+ val = chords->C[i].l;
+
+ if (chords->Lnum >= rCap) {
+ chords->R = av_realloc_f(chords->R, rCap * 2, sizeof(int));
+ rCap *= 2;
+ }
+ chords->R[chords->Lnum++] = val;
+ }
+ }
+
+ /*
+ * Setting the length indices of chords.
+ * These are needed so that the algorithm can, for each chord,
+ * access the lookup table at the correct length in constant time.
+ */
+ chordLengthIndex = 0;
+ for (i = 0; i < chords->size; i++) {
+ while (chords->R[chordLengthIndex] < chords->C[i].l) {
+ chordLengthIndex++;
+ }
+ chords->C[i].i = chordLengthIndex;
+ }
+
+ /*
+ * Chords are sorted on Y. This way, when a row of the lookup table or IPlane
+ * is cached, the next chord offset has a better chance of being on the
+ * same cache line.
+ */
+ qsort(chords->C, chords->size, sizeof(chord), compChordY);
+
+ return 0;
+}
+
+static void freeIPlane(IPlane *imp)
+{
+ av_freep(&imp->img);
+}
+
+static int read_iplane(IPlane *imp, const uint8_t *dst, int dst_linesize,
+ int W, int H, int R, size_t type_size)
+{
+ if (!imp->img)
+ imp->img = av_calloc(H, sizeof(*imp->img));
+ if (!imp->img)
+ return AVERROR(ENOMEM);
+
+ imp->W = W;
+ imp->H = H;
+ imp->range = R;
+ imp->type_size = type_size;
+ imp->max = type_size == 1 ? Max : Max16;
+ imp->min = type_size == 1 ? Min : Min16;
+ imp->max_in_place = type_size == 1 ? MaxInPlace : MaxInPlace16;
+ imp->min_in_place = type_size == 1 ? MinInPlace : MinInPlace16;
+
+ for (int y = 0; y < H; y++)
+ imp->img[y] = (uint8_t *)(dst + y * dst_linesize);
+
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ MorphoContext *s = inlink->dst->priv;
+
+ s->nb_planes = desc->nb_components;
+ s->depth = desc->comp[0].depth;
+ s->type_size = (s->depth + 7) / 8;
+ s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+ s->planewidth[0] = s->planewidth[3] = inlink->w;
+ s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+ s->planeheight[0] = s->planeheight[3] = inlink->h;
+
+ switch (s->depth) {
+ case 8:
+ break;
+ }
+
+ return 0;
+}
+
+static int config_input_structure(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ MorphoContext *s = inlink->dst->priv;
+
+ if (ctx->inputs[0]->format != ctx->inputs[1]->format) {
+ av_log(ctx, AV_LOG_ERROR, "Inputs must be of same pixel format.\n");
+ return AVERROR(EINVAL);
+ }
+
+ s->splanewidth[1] = s->splanewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+ s->splanewidth[0] = s->splanewidth[3] = inlink->w;
+ s->splaneheight[1] = s->splaneheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+ s->splaneheight[0] = s->splaneheight[3] = inlink->h;
+
+ return 0;
+}
+
+typedef struct ThreadData {
+ AVFrame *in, *out;
+} ThreadData;
+
+static int activate(AVFilterContext *ctx)
+{
+ MorphoContext *s = ctx->priv;
+ return ff_framesync_activate(&s->fs);
+}
+
+static int do_morpho(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ AVFilterLink *outlink = ctx->outputs[0];
+ MorphoContext *s = ctx->priv;
+ AVFrame *in = NULL, *structurepic = NULL;
+ AVFrame *out;
+ int ret;
+
+ ret = ff_framesync_dualinput_get(fs, &in, &structurepic);
+ if (ret < 0)
+ return ret;
+ if (!structurepic)
+ return ff_filter_frame(outlink, in);
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out) {
+ av_frame_free(&in);
+ return AVERROR(ENOMEM);
+ }
+ av_frame_copy_props(out, in);
+
+ for (int p = 0; p < s->nb_planes; p++) {
+ const uint8_t *src = in->data[p];
+ const int src_linesize = in->linesize[p];
+ const uint8_t *ssrc = structurepic->data[p];
+ const int ssrc_linesize = structurepic->linesize[p];
+ uint8_t *ddst = out->data[p];
+ const int dst_linesize = out->linesize[p];
+ const int swidth = s->splanewidth[p];
+ const int sheight = s->splaneheight[p];
+ const int width = s->planewidth[p];
+ const int height = s->planeheight[p];
+ const int type_size = s->type_size;
+
+ if (!(s->planes & (1 << p))) {
+ av_image_copy_plane(out->data[p] + 0 * out->linesize[p],
+ out->linesize[p],
+ in->data[p] + 0 * in->linesize[p],
+ in->linesize[p],
+ width * ((s->depth + 7) / 8),
+ height);
+ continue;
+ }
+
+ if (!s->got_structure[p] || s->structures) {
+ ret = read_iplane(&s->SEimg[p], ssrc, ssrc_linesize, swidth, sheight, 1, type_size);
+ if (ret < 0)
+ goto fail;
+ ret = buildChordSet(s->SEimg[p], &s->SE[p]);
+ if (ret < 0)
+ goto fail;
+ s->got_structure[p] = 1;
+ }
+
+ ret = read_iplane(&s->f[p], src, src_linesize, width, height, 1, type_size);
+ if (ret < 0)
+ goto fail;
+
+ ret = read_iplane(&s->g[p], ddst, dst_linesize, s->f[p].W, s->f[p].H, s->f[p].range, type_size);
+ if (ret < 0)
+ goto fail;
+
+ if (s->mode)
+ ret = dilate(&s->g[p], s->f[p], s->SE[p], &s->Ty[p]);
+ else
+ ret = erode(&s->g[p], s->f[p], s->SE[p], &s->Ty[p]);
+ if (ret < 0)
+ goto fail;
+
+ if (s->structures)
+ freeChordSet(&s->SE[p]);
+ }
+
+ av_frame_free(&in);
+ out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
+ return ff_filter_frame(outlink, out);
+fail:
+ av_frame_free(&in);
+ return ret;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ MorphoContext *s = ctx->priv;
+ AVFilterLink *mainlink = ctx->inputs[0];
+ int ret;
+
+ s->fs.on_event = do_morpho;
+ ret = ff_framesync_init_dualinput(&s->fs, ctx);
+ if (ret < 0)
+ return ret;
+ outlink->w = mainlink->w;
+ outlink->h = mainlink->h;
+ outlink->time_base = mainlink->time_base;
+ outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
+ outlink->frame_rate = mainlink->frame_rate;
+
+ if ((ret = ff_framesync_configure(&s->fs)) < 0)
+ return ret;
+ outlink->time_base = s->fs.time_base;
+
+ return 0;
+}
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ MorphoContext *s = ctx->priv;
+
+ for (int p = 0; p < 4; p++) {
+ freeIPlane(&s->SEimg[p]);
+ freeIPlane(&s->g[p]);
+ freeIPlane(&s->f[p]);
+ freeChordSet(&s->SE[p]);
+ freeLUT(&s->Ty[p], s->type_size);
+ }
+
+ ff_framesync_uninit(&s->fs);
+}
+
+static const AVFilterPad morpho_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ },
+ {
+ .name = "structure",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input_structure,
+ },
+};
+
+static const AVFilterPad morpho_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+};
+
+const AVFilter ff_vf_morpho = {
+ .name = "morpho",
+ .description = NULL_IF_CONFIG_SMALL("Apply Morphological filter."),
+ .preinit = morpho_framesync_preinit,
+ .priv_size = sizeof(MorphoContext),
+ .priv_class = &morpho_class,
+ .activate = activate,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ FILTER_INPUTS(morpho_inputs),
+ FILTER_OUTPUTS(morpho_outputs),
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+ .process_command = ff_filter_process_command,
+};
--
2.17.1
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