[FFmpeg-devel] [PATCH] avfilter: add deblock filter
Paul B Mahol
onemda at gmail.com
Tue Apr 17 23:55:51 EEST 2018
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 23 +++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_deblock.c | 366 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 391 insertions(+)
create mode 100644 libavfilter/vf_deblock.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 77a1d49520..2ec6e85e81 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -7078,6 +7078,29 @@ e.g. banding detection threshold is triggered for all color components.
The default is disabled.
@end table
+ at section deblock
+
+Remove blocking artifacts from input video.
+
+The filter accepts the following options:
+
+ at table @option
+ at item filter
+Set filter type, can be @var{weak} or @var{strong}. Default is @var{strong}.
+
+ at item block
+Set size of block, allowed range is from 4 to 512.
+
+ at item alpha
+ at item beta
+ at item gamma
+ at item delta
+Set blocking detection thresholds.
+
+ at item planes
+Set planes to filter. Default is to filter all available planes.
+ at end table
+
@anchor{decimate}
@section decimate
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 7fc3de3bb2..0cd964ee6f 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -173,6 +173,7 @@ OBJS-$(CONFIG_CURVES_FILTER) += vf_curves.o
OBJS-$(CONFIG_DATASCOPE_FILTER) += vf_datascope.o
OBJS-$(CONFIG_DCTDNOIZ_FILTER) += vf_dctdnoiz.o
OBJS-$(CONFIG_DEBAND_FILTER) += vf_deband.o
+OBJS-$(CONFIG_DEBLOCK_FILTER) += vf_deblock.o
OBJS-$(CONFIG_DECIMATE_FILTER) += vf_decimate.o
OBJS-$(CONFIG_DECONVOLVE_FILTER) += vf_convolve.o framesync.o
OBJS-$(CONFIG_DEFLATE_FILTER) += vf_neighbor.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index bd55463bfc..643eec287d 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -165,6 +165,7 @@ extern AVFilter ff_vf_curves;
extern AVFilter ff_vf_datascope;
extern AVFilter ff_vf_dctdnoiz;
extern AVFilter ff_vf_deband;
+extern AVFilter ff_vf_deblock;
extern AVFilter ff_vf_decimate;
extern AVFilter ff_vf_deconvolve;
extern AVFilter ff_vf_deflate;
diff --git a/libavfilter/vf_deblock.c b/libavfilter/vf_deblock.c
new file mode 100644
index 0000000000..f40550437f
--- /dev/null
+++ b/libavfilter/vf_deblock.c
@@ -0,0 +1,366 @@
+/*
+ * Copyright (c) 2018 Paul B Mahol
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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
+ */
+
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+enum FilterType { WEAK, STRONG, NB_FILTER };
+
+typedef struct DeblockContext {
+ const AVClass *class;
+ const AVPixFmtDescriptor *desc;
+ int filter;
+ int block;
+ int planes;
+ float alpha;
+ float beta;
+ float gamma;
+ float delta;
+
+ int ath;
+ int bth;
+ int gth;
+ int dth;
+ int max;
+ int depth;
+ int nb_planes;
+ int width[4];
+ int height[4];
+
+ void (*deblockh)(uint8_t *dst, ptrdiff_t linesize, int width, int height,
+ int block, int ath, int bth, int gth, int dth, int max);
+ void (*deblockv)(uint8_t *dst, ptrdiff_t linesize, int width, int height,
+ int block, int ath, int bth, int gth, int dth, int max);
+} DeblockContext;
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pixel_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_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
+ 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_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
+ AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
+ AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
+ AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
+ AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
+ AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY16,
+ AV_PIX_FMT_NONE
+ };
+ AVFilterFormats *formats = ff_make_format_list(pixel_fmts);
+ if (!formats)
+ return AVERROR(ENOMEM);
+ return ff_set_common_formats(ctx, formats);
+}
+
+#define WEAK_HFILTER(name, type) \
+static void deblockh##name##_weak(uint8_t *dstp, ptrdiff_t linesize, int width, int height, \
+ int block, int ath, int bth, int gth, int dth, int max) \
+{ \
+ type *dst; \
+ int x, y; \
+ \
+ for (y = block; y < height - 2; y += block) { \
+ dst = (type *)(dstp + y * linesize); \
+ for (x = 0; x < width; x++) { \
+ int delta = dst[x] - dst[x - linesize]; \
+ int A, B, C, D, a, b, c, d; \
+ \
+ if (FFABS(delta) >= ath || \
+ FFABS(dst[x - 1 * linesize] - dst[x - 2 * linesize]) >= bth || \
+ FFABS(dst[x + 0 * linesize] - dst[x + 1 * linesize]) >= gth) \
+ continue; \
+ \
+ A = dst[x - 2 * linesize]; \
+ B = dst[x - 1 * linesize]; \
+ C = dst[x + 0 * linesize]; \
+ D = dst[x + 1 * linesize]; \
+ \
+ a = A + delta / 8; \
+ b = B + delta / 2; \
+ c = C - delta / 2; \
+ d = D - delta / 8; \
+ \
+ dst[x - 2 * linesize] = av_clip(a, 0, max); \
+ dst[x - 1 * linesize] = av_clip(b, 0, max); \
+ dst[x + 0 * linesize] = av_clip(c, 0, max); \
+ dst[x + 1 * linesize] = av_clip(d, 0, max); \
+ } \
+ } \
+}
+
+WEAK_HFILTER(8, uint8_t)
+WEAK_HFILTER(16, uint16_t)
+
+#define WEAK_VFILTER(name, type) \
+static void deblockv##name##_weak(uint8_t *dstp, ptrdiff_t linesize, int width, int height, \
+ int block, int ath, int bth, int gth, int dth, int max) \
+{ \
+ type *dst; \
+ int x, y; \
+ \
+ for (y = 0; y < height; y++) { \
+ dst = (type *)(dstp + y * linesize); \
+ for (x = block; x < width - 2; x += block) { \
+ int delta = dst[x] - dst[x - 1]; \
+ int A, B, C, D, a, b, c, d; \
+ \
+ if (FFABS(delta) >= ath || \
+ FFABS(dst[x - 1] - dst[x - 2]) >= bth || \
+ FFABS(dst[x + 0] - dst[x + 1]) >= gth) \
+ continue; \
+ \
+ A = dst[x - 2]; \
+ B = dst[x - 1]; \
+ C = dst[x + 0]; \
+ D = dst[x + 1]; \
+ \
+ a = A + delta / 8; \
+ b = B + delta / 2; \
+ c = C - delta / 2; \
+ d = D - delta / 8; \
+ \
+ dst[x - 2] = av_clip(a, 0, max); \
+ dst[x - 1] = av_clip(b, 0, max); \
+ dst[x + 0] = av_clip(c, 0, max); \
+ dst[x + 1] = av_clip(d, 0, max); \
+ } \
+ } \
+}
+
+WEAK_VFILTER(8, uint8_t)
+WEAK_VFILTER(16, uint16_t)
+
+#define STRONG_HFILTER(name, type) \
+static void deblockh##name##_strong(uint8_t *dstp, ptrdiff_t linesize, \
+ int width, int height, int block, \
+ int ath, int bth, int gth, int dth, int max) \
+{ \
+ type *dst; \
+ int x, y; \
+ \
+ for (y = block; y < height - 3; y += block) { \
+ dst = (type *)(dstp + y * linesize); \
+ for (x = 0; x < width; x++) { \
+ int A, B, C, D, E, F, a, b, c, d, e, f; \
+ int delta = dst[x] - dst[x - linesize]; \
+ \
+ if (FFABS(delta) >= ath || \
+ FFABS(dst[x - 1 * linesize] - dst[x - 2 * linesize]) >= bth || \
+ FFABS(dst[x + 1 * linesize] - dst[x + 2 * linesize]) >= gth || \
+ FFABS(dst[x + 0 * linesize] - dst[x + 1 * linesize]) >= dth) \
+ continue; \
+ \
+ A = dst[x - 3 * linesize]; \
+ B = dst[x - 2 * linesize]; \
+ C = dst[x - 1 * linesize]; \
+ D = dst[x + 0 * linesize]; \
+ E = dst[x + 1 * linesize]; \
+ F = dst[x + 2 * linesize]; \
+ \
+ a = A + delta / 8; \
+ b = B + delta / 4; \
+ c = C + delta / 2; \
+ d = D - delta / 2; \
+ e = E - delta / 4; \
+ f = F - delta / 8; \
+ \
+ dst[x - 3 * linesize] = av_clip(a, 0, max); \
+ dst[x - 2 * linesize] = av_clip(b, 0, max); \
+ dst[x - 1 * linesize] = av_clip(c, 0, max); \
+ dst[x + 0 * linesize] = av_clip(d, 0, max); \
+ dst[x + 1 * linesize] = av_clip(e, 0, max); \
+ dst[x + 2 * linesize] = av_clip(f, 0, max); \
+ } \
+ } \
+}
+
+STRONG_HFILTER(8, uint8_t)
+STRONG_HFILTER(16, uint16_t)
+
+#define STRONG_VFILTER(name, type) \
+static void deblockv##name##_strong(uint8_t *dstp, ptrdiff_t linesize, \
+ int width, int height, int block, \
+ int ath, int bth, int gth, int dth, int max) \
+{ \
+ type *dst; \
+ int x, y; \
+ \
+ for (y = 0; y < height; y++) { \
+ dst = (type *)(dstp + y * linesize); \
+ for (x = block; x < width - 3; x += block) { \
+ int A, B, C, D, E, F, a, b, c, d, e, f; \
+ int delta = dst[x] - dst[x - 1]; \
+ \
+ if (FFABS(delta) >= ath || \
+ FFABS(dst[x - 1] - dst[x - 2]) >= bth || \
+ FFABS(dst[x + 1] - dst[x + 2]) >= gth || \
+ FFABS(dst[x + 0] - dst[x + 1]) >= dth) \
+ continue; \
+ \
+ A = dst[x - 3]; \
+ B = dst[x - 2]; \
+ C = dst[x - 1]; \
+ D = dst[x + 0]; \
+ E = dst[x + 1]; \
+ F = dst[x + 2]; \
+ \
+ a = A + delta / 8; \
+ b = B + delta / 4; \
+ c = C + delta / 2; \
+ d = D - delta / 2; \
+ e = E - delta / 4; \
+ f = F - delta / 8; \
+ \
+ dst[x - 3] = av_clip(a, 0, max); \
+ dst[x - 2] = av_clip(b, 0, max); \
+ dst[x - 1] = av_clip(c, 0, max); \
+ dst[x + 0] = av_clip(d, 0, max); \
+ dst[x + 1] = av_clip(e, 0, max); \
+ dst[x + 2] = av_clip(f, 0, max); \
+ } \
+ } \
+}
+
+STRONG_VFILTER(8, uint8_t)
+STRONG_VFILTER(16, uint16_t)
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ DeblockContext *s = ctx->priv;
+ AVFilterLink *inlink = ctx->inputs[0];
+
+ s->desc = av_pix_fmt_desc_get(outlink->format);
+ if (!s->desc)
+ return AVERROR_BUG;
+ s->nb_planes = av_pix_fmt_count_planes(outlink->format);
+ s->depth = s->desc->comp[0].depth;
+ s->max = (1 << s->depth) - 1;
+ s->ath = s->alpha * s->max;
+ s->bth = s->beta * s->max;
+ s->gth = s->gamma * s->max;
+ s->dth = s->delta * s->max;
+
+ if (s->depth <= 8 && s->filter == WEAK) {
+ s->deblockh = deblockh8_weak;
+ s->deblockv = deblockv8_weak;
+ } else if (s->depth >= 8 && s->filter == WEAK) {
+ s->deblockh = deblockh16_weak;
+ s->deblockv = deblockv16_weak;
+ }
+ if (s->depth <= 8 && s->filter == STRONG) {
+ s->deblockh = deblockh8_strong;
+ s->deblockv = deblockv8_strong;
+ } else if (s->depth >= 8 && s->filter == STRONG) {
+ s->deblockh = deblockh16_strong;
+ s->deblockv = deblockv16_strong;
+ }
+
+ s->width[1] = s->width[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
+ s->width[0] = s->width[3] = inlink->w;
+
+ s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
+ s->height[0] = s->height[3] = inlink->h;
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ DeblockContext *s = ctx->priv;
+ int plane;
+
+ for (plane = 0; plane < s->nb_planes; plane++) {
+ if (!((1 << plane) & s->planes))
+ continue;
+ s->deblockh(frame->data[plane], frame->linesize[plane],
+ s->width[plane], s->height[plane], s->block,
+ s->ath, s->bth, s->gth, s->dth, s->max);
+ s->deblockv(frame->data[plane], frame->linesize[plane],
+ s->width[plane], s->height[plane], s->block,
+ s->ath, s->bth, s->gth, s->dth, s->max);
+ }
+
+ return ff_filter_frame(outlink, frame);
+}
+
+#define OFFSET(x) offsetof(DeblockContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption deblock_options[] = {
+ { "filter", "set type of filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=STRONG},0, 1, FLAGS, "filter" },
+ { "weak", 0, 0, AV_OPT_TYPE_CONST, {.i64=WEAK}, 0, 0, FLAGS, "filter" },
+ { "strong", 0, 0, AV_OPT_TYPE_CONST, {.i64=STRONG},0, 0, FLAGS, "filter" },
+ { "block", "set size of block", OFFSET(block), AV_OPT_TYPE_INT, {.i64=8}, 4, 512, FLAGS },
+ { "alpha", "set 1st detection threshold", OFFSET(alpha), AV_OPT_TYPE_FLOAT, {.dbl=.098}, 0, 1, FLAGS },
+ { "beta", "set 2nd detection threshold", OFFSET(beta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
+ { "gamma", "set 3rd detection threshold", OFFSET(gamma), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
+ { "delta", "set 4th detection threshold", OFFSET(delta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
+ { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=15}, 0, 15, FLAGS },
+ { NULL },
+};
+
+static const AVFilterPad inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ .needs_writable = 1,
+ },
+ { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(deblock);
+
+AVFilter ff_vf_deblock = {
+ .name = "deblock",
+ .description = NULL_IF_CONFIG_SMALL("Deblock video."),
+ .priv_size = sizeof(DeblockContext),
+ .priv_class = &deblock_class,
+ .query_formats = query_formats,
+ .inputs = inputs,
+ .outputs = outputs,
+};
--
2.11.0
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