[FFmpeg-devel] [PATCH] avfilter: Add reverse filter
Derek Buitenhuis
derek.buitenhuis at gmail.com
Thu Jul 16 19:43:59 CEST 2015
Signed-off-by: Derek Buitenhuis <derek.buitenhuis at gmail.com>
---
The design is how ubitux requested. Use trim with it or risk using ALL THEM MEMORY.
---
doc/filters.texi | 4 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/version.h | 2 +-
libavfilter/vf_reverse.c | 145 +++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 152 insertions(+), 1 deletion(-)
create mode 100644 libavfilter/vf_reverse.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 3b4ec2c..7b0410a 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8247,6 +8247,10 @@ pixels will slow things down on a large logo.
This filter uses the repeat_field flag from the Video ES headers and hard repeats
fields based on its value.
+ at section reverse
+
+Reverses a clip. Requires memory to buffer the entire clip, so trimming is suggested.
+
@section rotate
Rotate video by an arbitrary angle expressed in radians.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 058b9e9..1638ae8 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -185,6 +185,7 @@ OBJS-$(CONFIG_QP_FILTER) += vf_qp.o
OBJS-$(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
+OBJS-$(CONFIG_REVERSE_FILTER) += vf_reverse.o
OBJS-$(CONFIG_ROTATE_FILTER) += vf_rotate.o
OBJS-$(CONFIG_SEPARATEFIELDS_FILTER) += vf_separatefields.o
OBJS-$(CONFIG_SAB_FILTER) += vf_sab.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index b0d8410..5e2a322 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -200,6 +200,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(REMOVEGRAIN, removegrain, vf);
REGISTER_FILTER(REMOVELOGO, removelogo, vf);
REGISTER_FILTER(REPEATFIELDS, repeatfields, vf);
+ REGISTER_FILTER(REVERSE, reverse, vf);
REGISTER_FILTER(ROTATE, rotate, vf);
REGISTER_FILTER(SAB, sab, vf);
REGISTER_FILTER(SCALE, scale, vf);
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 618c626..d22b2c5 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 5
-#define LIBAVFILTER_VERSION_MINOR 22
+#define LIBAVFILTER_VERSION_MINOR 23
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_reverse.c b/libavfilter/vf_reverse.c
new file mode 100644
index 0000000..00512be
--- /dev/null
+++ b/libavfilter/vf_reverse.c
@@ -0,0 +1,145 @@
+/*
+ * Copyright (c) 2015 Derek Buitenhuis
+ *
+ * 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 "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+#define DEFAULT_LENGTH 300
+
+typedef struct ReverseContext {
+ const AVClass *class;
+
+ int nb_frames;
+ AVFrame **frames;
+ unsigned int frames_size;
+ unsigned int pts_size;
+ int64_t *pts;
+ int flush_idx;
+} ReverseContext;
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ ReverseContext *s = ctx->priv;
+
+ s->pts = av_fast_realloc(NULL, &s->pts_size,
+ DEFAULT_LENGTH * sizeof(*(s->pts)));
+ if (!s->pts)
+ return AVERROR(ENOMEM);
+
+ s->frames = av_fast_realloc(NULL, &s->frames_size,
+ DEFAULT_LENGTH * sizeof(*(s->frames)));
+ if (!s->frames) {
+ av_freep(&s->pts);
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ ReverseContext *s = ctx->priv;
+
+ av_freep(&s->pts);
+ av_freep(&s->frames);
+}
+
+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;
+ ReverseContext *s = ctx->priv;
+
+
+ if (s->nb_frames + 1 > s->frames_size / sizeof(*(s->frames))) {
+ void *ptr;
+
+ ptr = av_fast_realloc(s->pts, &s->pts_size, s->pts_size * 2);
+ if (!ptr)
+ return AVERROR(ENOMEM);
+ s->pts = ptr;
+
+ ptr = av_fast_realloc(s->frames, &s->frames_size, s->frames_size * 2);
+ if (!ptr)
+ return AVERROR(ENOMEM);
+ s->frames = ptr;
+ }
+
+ s->frames[s->nb_frames] = in;
+ s->pts[s->nb_frames] = in->pts;
+ s->nb_frames++;
+
+ return 0;
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ ReverseContext *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 reverse_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad reverse_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = request_frame,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_reverse = {
+ .name = "reverse",
+ .description = NULL_IF_CONFIG_SMALL("Reverse a clip."),
+ .priv_size = sizeof(ReverseContext),
+ .init = init,
+ .uninit = uninit,
+ .inputs = reverse_inputs,
+ .outputs = reverse_outputs,
+};
--
1.8.3.1
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