avfilter: add random video filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>
pull/140/head
Paul B Mahol 10 years ago
parent eb468b0be0
commit a8fbb7b625
  1. 1
      Changelog
  2. 18
      doc/filters.texi
  3. 1
      libavfilter/Makefile
  4. 1
      libavfilter/allfilters.c
  5. 2
      libavfilter/version.h
  6. 144
      libavfilter/vf_random.c

@ -19,6 +19,7 @@ version <next>:
- erosion, dilation, deflate and inflate video filters
- Dynamic Audio Normalizer as dynaudnorm filter
- Reverse filter
- Random filter
version 2.7:

@ -8279,6 +8279,24 @@ 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 frames of internal cache, in range from @code{2} to
@code{512}. Default is @code{30}.
@item seed
Set seed for random number generator, must be an integer included between
@code{0} and @code{UINT32_MAX}. If not specified, or if explicitly set to
less than @code{0}, the filter will try to use a good random seed on a
best effort basis.
@end table
@section removegrain
The removegrain filter is a spatial denoiser for progressive video.

@ -183,6 +183,7 @@ 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

@ -198,6 +198,7 @@ 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);

@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 5
#define LIBAVFILTER_VERSION_MINOR 24
#define LIBAVFILTER_VERSION_MINOR 25
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

@ -0,0 +1,144 @@
/*
* 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/lfg.h"
#include "libavutil/opt.h"
#include "libavutil/random_seed.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#define MAX_FRAMES 512
typedef struct RandomContext {
const AVClass *class;
AVLFG lfg;
int nb_frames;
int64_t random_seed;
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 },
{ "seed", "set the seed", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT32_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(random);
static av_cold int init(AVFilterContext *ctx)
{
RandomContext *s = ctx->priv;
uint32_t seed;
if (s->random_seed < 0)
s->random_seed = av_get_random_seed();
seed = s->random_seed;
av_lfg_init(&s->lfg, seed);
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->frames[s->nb_frames - 1] = NULL;
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("Return random frames."),
.priv_size = sizeof(RandomContext),
.priv_class = &random_class,
.init = init,
.inputs = random_inputs,
.outputs = random_outputs,
};
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