[FFmpeg-devel] [PATCH] avfilter: add freezeframes video filter
Paul B Mahol
onemda at gmail.com
Tue Dec 31 13:48:47 EET 2019
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 19 ++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_freezeframes.c | 167 ++++++++++++++++++++++++++++++++++
4 files changed, 188 insertions(+)
create mode 100644 libavfilter/vf_freezeframes.c
diff --git a/doc/filters.texi b/doc/filters.texi
index ba00989987..ca3ddc19eb 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -11166,6 +11166,25 @@ specified value) or as a difference ratio between 0 and 1. Default is -60dB, or
Set freeze duration until notification (default is 2 seconds).
@end table
+ at section freezeframes
+
+Freeze video frames.
+
+This filter freeze video frames using frame from 2nd input.
+
+The filter accepts the following options:
+
+ at table @option
+ at item first
+Set number of first frame from which to start freeze.
+
+ at item last
+Set number of last frame from which to end freeze.
+
+ at item replace
+Set number of frame from 2nd input which will be used instead of replaced frames.
+ at end table
+
@anchor{frei0r}
@section frei0r
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 8b8a5bd535..58b3077dec 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -254,6 +254,7 @@ OBJS-$(CONFIG_FRAMEPACK_FILTER) += vf_framepack.o
OBJS-$(CONFIG_FRAMERATE_FILTER) += vf_framerate.o
OBJS-$(CONFIG_FRAMESTEP_FILTER) += vf_framestep.o
OBJS-$(CONFIG_FREEZEDETECT_FILTER) += vf_freezedetect.o
+OBJS-$(CONFIG_FREEZEFRAMES_FILTER) += vf_freezeframes.o
OBJS-$(CONFIG_FREI0R_FILTER) += vf_frei0r.o
OBJS-$(CONFIG_FSPP_FILTER) += vf_fspp.o
OBJS-$(CONFIG_GBLUR_FILTER) += vf_gblur.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 9f2080f857..6270c18ae2 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -239,6 +239,7 @@ extern AVFilter ff_vf_framepack;
extern AVFilter ff_vf_framerate;
extern AVFilter ff_vf_framestep;
extern AVFilter ff_vf_freezedetect;
+extern AVFilter ff_vf_freezeframes;
extern AVFilter ff_vf_frei0r;
extern AVFilter ff_vf_fspp;
extern AVFilter ff_vf_gblur;
diff --git a/libavfilter/vf_freezeframes.c b/libavfilter/vf_freezeframes.c
new file mode 100644
index 0000000000..b6cd5dba68
--- /dev/null
+++ b/libavfilter/vf_freezeframes.c
@@ -0,0 +1,167 @@
+/*
+ * 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/avassert.h"
+#include "libavutil/avstring.h"
+#include "libavutil/common.h"
+#include "libavutil/internal.h"
+#include "libavutil/opt.h"
+
+#include "avfilter.h"
+#include "filters.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct FreezeFramesContext {
+ const AVClass *class;
+ int64_t first, last, replace;
+
+ AVFrame *replace_frame;
+} FreezeFramesContext;
+
+#define OFFSET(x) offsetof(FreezeFramesContext, x)
+#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
+
+static const AVOption freezeframes_options[] = {
+ { "first", "set first frame to freeze", OFFSET(first), AV_OPT_TYPE_INT64, {.i64=0}, 0, INT64_MAX, FLAGS },
+ { "last", "set last frame to freeze", OFFSET(last), AV_OPT_TYPE_INT64, {.i64=0}, 0, INT64_MAX, FLAGS },
+ { "replace", "set frame to replace", OFFSET(replace), AV_OPT_TYPE_INT64, {.i64=0}, 0, INT64_MAX, FLAGS },
+ { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(freezeframes);
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AVFilterLink *sourcelink = ctx->inputs[0];
+ AVFilterLink *replacelink = ctx->inputs[1];
+
+ if (sourcelink->w != replacelink->w || sourcelink->h != replacelink->h) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Input frame sizes do not match (%dx%d vs %dx%d).\n",
+ sourcelink->w, sourcelink->h,
+ replacelink->w, replacelink->h);
+ return AVERROR(EINVAL);
+ }
+
+ outlink->w = sourcelink->w;
+ outlink->h = sourcelink->h;
+ outlink->time_base = sourcelink->time_base;
+ outlink->sample_aspect_ratio = sourcelink->sample_aspect_ratio;
+ outlink->frame_rate = sourcelink->frame_rate;
+
+ return 0;
+}
+
+static int activate(AVFilterContext *ctx)
+{
+ AVFilterLink *outlink = ctx->outputs[0];
+ FreezeFramesContext *s = ctx->priv;
+ AVFrame *frame = NULL;
+ int drop = ctx->inputs[0]->frame_count_out >= s->first &&
+ ctx->inputs[0]->frame_count_out <= s->last;
+ int replace = ctx->inputs[1]->frame_count_out == s->replace;
+ int ret;
+
+ FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);
+
+ if (drop && s->replace_frame) {
+ ret = ff_inlink_consume_frame(ctx->inputs[0], &frame);
+ if (ret < 0)
+ return ret;
+
+ if (frame) {
+ int64_t dropped_pts = frame->pts;
+
+ av_frame_free(&frame);
+ frame = av_frame_clone(s->replace_frame);
+ if (!frame)
+ return AVERROR(ENOMEM);
+ frame->pts = dropped_pts;
+ return ff_filter_frame(outlink, frame);
+ }
+ } else if (!drop) {
+ ret = ff_inlink_consume_frame(ctx->inputs[0], &frame);
+ if (ret < 0)
+ return ret;
+
+ if (frame)
+ return ff_filter_frame(outlink, frame);
+ }
+
+ ret = ff_inlink_consume_frame(ctx->inputs[1], &frame);
+ if (ret < 0)
+ return ret;
+ if (replace && frame) {
+ s->replace_frame = frame;
+ } else if (frame) {
+ av_frame_free(&frame);
+ }
+
+ FF_FILTER_FORWARD_STATUS(ctx->inputs[0], outlink);
+ FF_FILTER_FORWARD_STATUS(ctx->inputs[1], outlink);
+
+ if (!drop || (drop && s->replace_frame))
+ FF_FILTER_FORWARD_WANTED(outlink, ctx->inputs[0]);
+ if (!s->replace_frame)
+ FF_FILTER_FORWARD_WANTED(outlink, ctx->inputs[1]);
+
+ return FFERROR_NOT_READY;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ FreezeFramesContext *s = ctx->priv;
+
+ av_frame_free(&s->replace_frame);
+}
+
+static const AVFilterPad freezeframes_inputs[] = {
+ {
+ .name = "source",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ {
+ .name = "replace",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL },
+};
+
+static const AVFilterPad freezeframes_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL },
+};
+
+AVFilter ff_vf_freezeframes = {
+ .name = "freezeframes",
+ .description = NULL_IF_CONFIG_SMALL("Freeze video frames."),
+ .priv_size = sizeof(FreezeFramesContext),
+ .priv_class = &freezeframes_class,
+ .inputs = freezeframes_inputs,
+ .outputs = freezeframes_outputs,
+ .activate = activate,
+ .uninit = uninit,
+};
--
2.17.1
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