[FFmpeg-devel] [PATCH] avfilter: add xmedian filter
Paul B Mahol
onemda at gmail.com
Fri May 3 16:19:09 EEST 2019
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 11 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_xmedian.c | 325 +++++++++++++++++++++++++++++++++++++++
4 files changed, 338 insertions(+)
create mode 100644 libavfilter/vf_xmedian.c
diff --git a/doc/filters.texi b/doc/filters.texi
index cd82869849..fad3cf0ae8 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -18362,6 +18362,17 @@ Set the scaling dimension: @code{2} for @code{2xBR}, @code{3} for
Default is @code{3}.
@end table
+ at section xmedian
+Pick median pixels from several input videos.
+
+The filter accept the following option:
+
+ at table @option
+ at item radius
+Set radius, this sets number of inputs to 2 * radius + 1.
+Default is 1. Allowed range is from 1 to 127.
+ at end table
+
@section xstack
Stack video inputs into custom layout.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 59d12ce069..b18b040922 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -420,6 +420,7 @@ OBJS-$(CONFIG_W3FDIF_FILTER) += vf_w3fdif.o
OBJS-$(CONFIG_WAVEFORM_FILTER) += vf_waveform.o
OBJS-$(CONFIG_WEAVE_FILTER) += vf_weave.o
OBJS-$(CONFIG_XBR_FILTER) += vf_xbr.o
+OBJS-$(CONFIG_XMEDIAN_FILTER) += vf_xmedian.o framesync.o
OBJS-$(CONFIG_XSTACK_FILTER) += vf_stack.o framesync.o
OBJS-$(CONFIG_YADIF_FILTER) += vf_yadif.o yadif_common.o
OBJS-$(CONFIG_YADIF_CUDA_FILTER) += vf_yadif_cuda.o vf_yadif_cuda.ptx.o \
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index ae725cb0e0..108a8872d5 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -399,6 +399,7 @@ extern AVFilter ff_vf_w3fdif;
extern AVFilter ff_vf_waveform;
extern AVFilter ff_vf_weave;
extern AVFilter ff_vf_xbr;
+extern AVFilter ff_vf_xmedian;
extern AVFilter ff_vf_xstack;
extern AVFilter ff_vf_yadif;
extern AVFilter ff_vf_yadif_cuda;
diff --git a/libavfilter/vf_xmedian.c b/libavfilter/vf_xmedian.c
new file mode 100644
index 0000000000..c9e972a0cb
--- /dev/null
+++ b/libavfilter/vf_xmedian.c
@@ -0,0 +1,325 @@
+/*
+ * Copyright (c) 2019 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/avstring.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/qsort.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "framesync.h"
+#include "video.h"
+
+typedef struct XMedianContext {
+ const AVClass *class;
+ const AVPixFmtDescriptor *desc;
+ int radius;
+ int nb_inputs;
+
+ int depth;
+ int max;
+ int nb_planes;
+ int linesize[4];
+ int width[4];
+ int height[4];
+
+ int values[128][256];
+ AVFrame **frames;
+ FFFrameSync fs;
+
+ int (*median_frames)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
+} XMedianContext;
+
+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_GRAY14,
+ 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)
+{
+ XMedianContext *s = ctx->priv;
+ int ret;
+
+ s->nb_inputs = s->radius * 2 + 1;
+ s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
+ if (!s->frames)
+ return AVERROR(ENOMEM);
+
+ for (int i = 0; i < s->nb_inputs; i++) {
+ AVFilterPad pad = { 0 };
+
+ pad.type = AVMEDIA_TYPE_VIDEO;
+ pad.name = av_asprintf("input%d", i);
+ if (!pad.name)
+ return AVERROR(ENOMEM);
+
+ if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
+ av_freep(&pad.name);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+typedef struct ThreadData {
+ AVFrame **in, *out;
+} ThreadData;
+
+static int comparei(const void *p1, const void *p2)
+{
+ int left = *(const int *)p1;
+ int right = *(const int *)p2;
+ return FFDIFFSIGN(left, right);
+}
+
+static int median_frames16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+ XMedianContext *s = ctx->priv;
+ ThreadData *td = arg;
+ AVFrame **in = td->in;
+ AVFrame *out = td->out;
+ const int nb_inputs = s->nb_inputs;
+ const int radius = s->radius;
+ int *values = s->values[jobnr];
+
+ for (int 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]);
+
+ for (int y = slice_start; y < slice_end; y++) {
+ for (int x = 0; x < s->width[p]; x++) {
+ for (int i = 0; i < nb_inputs; i++) {
+ const uint16_t *src = (const uint16_t *)(in[i]->data[p] + y * in[i]->linesize[p]);
+ values[i] = src[x];
+ }
+
+ AV_QSORT(values, nb_inputs, int, comparei);
+ dst[x] = values[radius];
+ }
+
+ dst += out->linesize[p] / 2;
+ }
+ }
+
+ return 0;
+}
+
+static int median_frames8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+ XMedianContext *s = ctx->priv;
+ ThreadData *td = arg;
+ AVFrame **in = td->in;
+ AVFrame *out = td->out;
+ const int nb_inputs = s->nb_inputs;
+ const int radius = s->radius;
+ int *values = s->values[jobnr];
+
+ for (int 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];
+
+ for (int y = slice_start; y < slice_end; y++) {
+ for (int x = 0; x < s->width[p]; x++) {
+ for (int i = 0; i < nb_inputs; i++)
+ values[i] = in[i]->data[p][y * in[i]->linesize[p] + x];
+
+ AV_QSORT(values, nb_inputs, int, comparei);
+ dst[x] = values[radius];
+ }
+
+ dst += out->linesize[p];
+ }
+ }
+
+ return 0;
+}
+
+static int process_frame(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ AVFilterLink *outlink = ctx->outputs[0];
+ XMedianContext *s = fs->opaque;
+ AVFrame **in = s->frames;
+ AVFrame *out;
+ ThreadData td;
+ int i, ret;
+
+ for (i = 0; i < s->nb_inputs; i++) {
+ if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
+ return ret;
+ }
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out)
+ return AVERROR(ENOMEM);
+ out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
+
+ td.in = in;
+ td.out = out;
+ ctx->internal->execute(ctx, s->median_frames, &td, NULL, FFMIN(s->height[1], ff_filter_get_nb_threads(ctx)));
+
+ return ff_filter_frame(outlink, out);
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ XMedianContext *s = ctx->priv;
+ AVRational time_base = ctx->inputs[0]->time_base;
+ AVRational frame_rate = ctx->inputs[0]->frame_rate;
+ AVFilterLink *inlink = ctx->inputs[0];
+ int height = ctx->inputs[0]->h;
+ int width = ctx->inputs[0]->w;
+ FFFrameSyncIn *in;
+ int i, ret;
+
+ for (int i = 1; i < s->nb_inputs; i++) {
+ if (ctx->inputs[i]->h != height || ctx->inputs[i]->w != width) {
+ av_log(ctx, AV_LOG_ERROR, "Input %d size (%dx%d) does not match input %d size (%dx%d).\n", i, ctx->inputs[i]->w, ctx->inputs[i]->h, 0, width, height);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ 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 (s->depth <= 8)
+ s->median_frames = median_frames8;
+ else
+ s->median_frames = median_frames16;
+
+ if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
+ return ret;
+
+ 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;
+
+ outlink->w = width;
+ outlink->h = height;
+ outlink->time_base = time_base;
+ outlink->frame_rate = frame_rate;
+
+ if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
+ return ret;
+
+ in = s->fs.in;
+ s->fs.opaque = s;
+ s->fs.on_event = process_frame;
+
+ for (i = 0; i < s->nb_inputs; i++) {
+ AVFilterLink *inlink = ctx->inputs[i];
+
+ in[i].time_base = inlink->time_base;
+ in[i].sync = 1;
+ in[i].before = EXT_STOP;
+ in[i].after = EXT_STOP;
+ }
+
+ return ff_framesync_configure(&s->fs);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ XMedianContext *s = ctx->priv;
+
+ ff_framesync_uninit(&s->fs);
+ av_freep(&s->frames);
+
+ for (int i = 0; i < ctx->nb_inputs; i++)
+ av_freep(&ctx->input_pads[i].name);
+}
+
+static int activate(AVFilterContext *ctx)
+{
+ XMedianContext *s = ctx->priv;
+ return ff_framesync_activate(&s->fs);
+}
+
+#define OFFSET(x) offsetof(XMedianContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption xmedian_options[] = {
+ { "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=1}, 1, 127, .flags = FLAGS },
+ { NULL },
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(xmedian);
+
+AVFilter ff_vf_xmedian = {
+ .name = "xmedian",
+ .description = NULL_IF_CONFIG_SMALL("Pick median pixels from several video inputs."),
+ .priv_size = sizeof(XMedianContext),
+ .priv_class = &xmedian_class,
+ .query_formats = query_formats,
+ .outputs = outputs,
+ .init = init,
+ .uninit = uninit,
+ .activate = activate,
+ .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_SLICE_THREADS,
+};
--
2.17.1
More information about the ffmpeg-devel
mailing list