Signed-off-by: Paul B Mahol <one...@gmail.com>
---
doc/filters.texi | 12 +++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_random.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 150 insertions(+)
create mode 100644 libavfilter/vf_random.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 2679090..04d9333 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8095,6 +8095,18 @@ qp=2+2*sin(PI*qp)
@end example
@end itemize
+@section random
+
+Flush video frames from internal cache of frames into a random order.
+No frame is discarded.
+Inspired by @ref{frei0r} nervous filter.
+
+@table @option
+@item frames
+Set size in number of frame of internal cache, in range from 2 to 400.
+Default is 30.
+@end table
+
@section removegrain
The removegrain filter is a spatial denoiser for progressive video.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 058b9e9..8150640 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -182,6 +182,7 @@ OBJS-$(CONFIG_PP7_FILTER) += vf_pp7.o
OBJS-$(CONFIG_PSNR_FILTER) += vf_psnr.o dualinput.o
framesync.o
OBJS-$(CONFIG_PULLUP_FILTER) += vf_pullup.o
OBJS-$(CONFIG_QP_FILTER) += vf_qp.o
+OBJS-$(CONFIG_RANDOM_FILTER) += vf_random.o
OBJS-$(CONFIG_REMOVEGRAIN_FILTER) += vf_removegrain.o
OBJS-$(CONFIG_REMOVELOGO_FILTER) += bbox.o lswsutils.o lavfutils.o
vf_removelogo.o
OBJS-$(CONFIG_REPEATFIELDS_FILTER) += vf_repeatfields.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index b0d8410..d1be38a 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -197,6 +197,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(PSNR, psnr, vf);
REGISTER_FILTER(PULLUP, pullup, vf);
REGISTER_FILTER(QP, qp, vf);
+ REGISTER_FILTER(RANDOM, random, vf);
REGISTER_FILTER(REMOVEGRAIN, removegrain, vf);
REGISTER_FILTER(REMOVELOGO, removelogo, vf);
REGISTER_FILTER(REPEATFIELDS, repeatfields, vf);
diff --git a/libavfilter/vf_random.c b/libavfilter/vf_random.c
new file mode 100644
index 0000000..ce64915
--- /dev/null
+++ b/libavfilter/vf_random.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2015 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/opt.h"
+#include "libavutil/lfg.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+#define MAX_FRAMES 400
+
+typedef struct RandomContext {
+ const AVClass *class;
+
+ AVLFG lfg;
+ int nb_frames;
+ int nb_frames_filled;
+ AVFrame *frames[MAX_FRAMES];
+ int64_t pts[MAX_FRAMES];
+ int flush_idx;
+} RandomContext;
+
+#define OFFSET(x) offsetof(RandomContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption random_options[] = {
+ { "frames", "set number of frames in cache", OFFSET(nb_frames),
AV_OPT_TYPE_INT, {.i64=30}, 2, MAX_FRAMES, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(random);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ RandomContext *s = ctx->priv;
+
+ av_lfg_init(&s->lfg, 1337);
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ AVFilterContext *ctx = inlink->dst;
+ RandomContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AVFrame *out;
+ int idx;
+
+ if (s->nb_frames_filled < s->nb_frames) {
+ s->frames[s->nb_frames_filled] = in;
+ s->pts[s->nb_frames_filled++] = in->pts;
+ return 0;
+ }
+
+ idx = av_lfg_get(&s->lfg) % s->nb_frames;
+
+ out = s->frames[idx];
+ out->pts = s->pts[0];
+ memmove(&s->pts[0], &s->pts[1], (s->nb_frames - 1) * sizeof(s->pts[0]));
+ s->frames[idx] = in;
+ s->pts[s->nb_frames - 1] = in->pts;
+
+ return ff_filter_frame(outlink, out);
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ RandomContext *s = ctx->priv;
+ int ret;
+
+ ret = ff_request_frame(ctx->inputs[0]);
+
+ if (ret == AVERROR_EOF && !ctx->is_disabled && s->nb_frames > 0) {
+ AVFrame *out = s->frames[s->nb_frames - 1];
+ out->pts = s->pts[s->flush_idx++];
+ ret = ff_filter_frame(outlink, out);
+ s->nb_frames--;
+ }
+
+ return ret;
+}
+
+static const AVFilterPad random_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad random_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = request_frame,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_random = {
+ .name = "random",
+ .description = NULL_IF_CONFIG_SMALL("Flush frames in a random way."),
+ .priv_size = sizeof(RandomContext),
+ .priv_class = &random_class,
+ .init = init,
+ .inputs = random_inputs,
+ .outputs = random_outputs,
+};
--
1.7.11.2
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