[FFmpeg-devel] [PATCH] avfilter: add amplify filter
Paul B Mahol
onemda at gmail.com
Sat Apr 28 01:56:48 EEST 2018
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 24 ++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_amplify.c | 290 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 316 insertions(+)
create mode 100644 libavfilter/vf_amplify.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 44e0801f9c..48a13d7791 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -5187,6 +5187,30 @@ input reaches end of stream. This will cause problems if your encoding
pipeline drops frames. If you're trying to apply an image as an
overlay to a video stream, consider the @var{overlay} filter instead.
+ at section amplify
+
+Amplify differences between current pixel and pixels of adjacent frames in
+same pixel location.
+
+This filter accepts the following options:
+
+ at table @option
+ at item radius
+Set frame radius. Default is 2. Allowed range is from 1 to 63.
+For example radius of 3 will instruct filter to calculate average of 7 frames.
+
+ at item factor
+Set factor to amplify difference. Default is 2. Allowed range is from 0 to 65535.
+
+ at item threshold
+Set threshold for difference amplification. Any differrence greater or equal to
+this value will not alter source pixel. Default is 10.
+Allowed range is from 0 to 65535.
+
+ at item planes
+Set which planes to filter. Default is all. Allowed range is from 0 to 15.
+ at end table
+
@section ass
Same as the @ref{subtitles} filter, except that it doesn't require libavcodec
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 7f8317c2f2..3454f25e7d 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -138,6 +138,7 @@ OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
# video filters
OBJS-$(CONFIG_ALPHAEXTRACT_FILTER) += vf_extractplanes.o
OBJS-$(CONFIG_ALPHAMERGE_FILTER) += vf_alphamerge.o
+OBJS-$(CONFIG_AMPLIFY_FILTER) += vf_amplify.o
OBJS-$(CONFIG_ASS_FILTER) += vf_subtitles.o
OBJS-$(CONFIG_ATADENOISE_FILTER) += vf_atadenoise.o
OBJS-$(CONFIG_AVGBLUR_FILTER) += vf_avgblur.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 35e12d595f..d958f9b2da 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -132,6 +132,7 @@ extern AVFilter ff_asink_anullsink;
extern AVFilter ff_vf_alphaextract;
extern AVFilter ff_vf_alphamerge;
+extern AVFilter ff_vf_amplify;
extern AVFilter ff_vf_ass;
extern AVFilter ff_vf_atadenoise;
extern AVFilter ff_vf_avgblur;
diff --git a/libavfilter/vf_amplify.c b/libavfilter/vf_amplify.c
new file mode 100644
index 0000000000..8e8c2ebd20
--- /dev/null
+++ b/libavfilter/vf_amplify.c
@@ -0,0 +1,290 @@
+/*
+ * 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/intreadwrite.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct AmplifyContext {
+ const AVClass *class;
+ const AVPixFmtDescriptor *desc;
+ int radius;
+ float factor;
+ float threshold;
+ int planes;
+
+ int nb_inputs;
+ int nb_frames;
+
+ int depth;
+ int max;
+ int nb_planes;
+ int linesize[4];
+ int height[4];
+
+ AVFrame **frames;
+} AmplifyContext;
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pixel_fmts[] = {
+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
+ AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,
+ AV_PIX_FMT_GRAY16,
+ AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
+ AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
+ AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
+ AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
+ AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
+ AV_PIX_FMT_YUVJ411P,
+ 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_YUV440P10,
+ AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
+ AV_PIX_FMT_YUV440P12,
+ AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
+ AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
+ 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_NONE
+ };
+ AVFilterFormats *formats = ff_make_format_list(pixel_fmts);
+ if (!formats)
+ return AVERROR(ENOMEM);
+ return ff_set_common_formats(ctx, formats);
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ AmplifyContext *s = ctx->priv;
+
+ s->nb_inputs = s->radius * 2 + 1;
+
+ s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
+ if (!s->frames)
+ return AVERROR(ENOMEM);
+
+ return 0;
+}
+
+typedef struct ThreadData {
+ AVFrame **in, *out;
+} ThreadData;
+
+static int amplify_frame(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+ AmplifyContext *s = ctx->priv;
+ ThreadData *td = arg;
+ AVFrame **in = td->in;
+ AVFrame *out = td->out;
+ const int radius = s->radius;
+ const int nb_inputs = s->nb_inputs;
+ const float threshold = s->threshold;
+ const float factor = s->factor;
+ int i, p, x, y;
+
+ if (s->depth <= 8) {
+ for (p = 0; p < s->nb_planes; p++) {
+ const int slice_start = (s->height[p] * jobnr) / nb_jobs;
+ const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
+ uint8_t *dst = out->data[p] + slice_start * out->linesize[p];
+
+ if (!((1 << p) & s->planes)) {
+ av_image_copy_plane(dst, out->linesize[p],
+ in[radius]->data[p] + slice_start * in[radius]->linesize[p],
+ in[radius]->linesize[p],
+ s->linesize[p], slice_end - slice_start);
+ continue;
+ }
+
+ for (y = slice_start; y < slice_end; y++) {
+ for (x = 0; x < s->linesize[p]; x++) {
+ int src = in[radius]->data[p][y * in[radius]->linesize[p] + x];
+ float diff, avg;
+ int sum = 0;
+
+ for (i = 0; i < nb_inputs; i++) {
+ sum += in[i]->data[p][y * in[i]->linesize[p] + x];
+ }
+
+ avg = sum / (float)nb_inputs;
+ diff = src - avg;
+ if (fabsf(diff) < threshold)
+ dst[x] = av_clip_uint8(src + diff * factor);
+ else
+ dst[x] = src;
+ }
+
+ dst += out->linesize[p];
+ }
+ }
+ } else {
+ for (p = 0; p < s->nb_planes; p++) {
+ const int slice_start = (s->height[p] * jobnr) / nb_jobs;
+ const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
+ uint16_t *dst = (uint16_t *)(out->data[p] + slice_start * out->linesize[p]);
+
+ if (!((1 << p) & s->planes)) {
+ av_image_copy_plane((uint8_t *)dst, out->linesize[p],
+ in[radius]->data[p] + slice_start * in[radius]->linesize[p],
+ in[radius]->linesize[p],
+ s->linesize[p], slice_end - slice_start);
+ continue;
+ }
+
+ for (y = slice_start; y < slice_end; y++) {
+ for (x = 0; x < s->linesize[p] / 2; x++) {
+ int src = AV_RN16(in[radius]->data[p] + y * in[radius]->linesize[p] + x * 2);
+ float diff, avg;
+ int sum = 0;
+
+ for (i = 0; i < nb_inputs; i++) {
+ sum += AV_RN16(in[i]->data[p] + y * in[i]->linesize[p] + x * 2);
+ }
+
+ avg = sum / (float)nb_inputs;
+ diff = src - avg;
+
+ if (fabsf(diff) < threshold)
+ dst[x] = av_clip(src + (src - avg) * factor, 0, s->max);
+ else
+ dst[x] = src;
+ }
+
+ dst += out->linesize[p] / 2;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AmplifyContext *s = ctx->priv;
+ AVFilterLink *inlink = ctx->inputs[0];
+ int ret;
+
+ 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;
+
+ if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
+ return ret;
+
+ 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 av_cold void uninit(AVFilterContext *ctx)
+{
+ AmplifyContext *s = ctx->priv;
+ int i;
+
+ for (i = 0; i < s->nb_frames; i++)
+ av_frame_free(&s->frames[i]);
+ av_freep(&s->frames);
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AmplifyContext *s = ctx->priv;
+ ThreadData td;
+ AVFrame *out;
+
+ if (s->nb_frames < s->nb_inputs) {
+ s->frames[s->nb_frames] = in;
+ s->nb_frames++;
+ return 0;
+ } else {
+ av_frame_free(&s->frames[0]);
+ memmove(&s->frames[0], &s->frames[1], sizeof(*s->frames) * (s->nb_inputs - 1));
+ s->frames[s->nb_inputs - 1] = in;
+ }
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out)
+ return AVERROR(ENOMEM);
+ out->pts = s->frames[0]->pts;
+
+ td.out = out;
+ td.in = s->frames;
+ ctx->internal->execute(ctx, amplify_frame, &td, NULL, FFMIN(s->height[1], ff_filter_get_nb_threads(ctx)));
+
+ return ff_filter_frame(outlink, out);
+}
+
+#define OFFSET(x) offsetof(AmplifyContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption amplify_options[] = {
+ { "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=2}, 1, 63, .flags = FLAGS },
+ { "factor", "set factor", OFFSET(factor), AV_OPT_TYPE_FLOAT, {.dbl=2}, 0, UINT16_MAX, .flags = FLAGS },
+ { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl=10}, 0, UINT16_MAX, .flags = FLAGS },
+ { "planes", "set what planes to filter", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 0, 15, FLAGS },
+ { NULL },
+};
+
+static const AVFilterPad inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(amplify);
+
+AVFilter ff_vf_amplify = {
+ .name = "amplify",
+ .description = NULL_IF_CONFIG_SMALL("Amplify changes between successive video frames."),
+ .priv_size = sizeof(AmplifyContext),
+ .priv_class = &lify_class,
+ .query_formats = query_formats,
+ .outputs = outputs,
+ .inputs = inputs,
+ .init = init,
+ .uninit = uninit,
+ .flags = AVFILTER_FLAG_SLICE_THREADS,
+};
--
2.11.0
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