TODO: bump minor
---
Changelog | 1 +
doc/filters.texi | 4 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_tdiff.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 138 insertions(+)
create mode 100644 libavfilter/vf_tdiff.c
diff --git a/Changelog b/Changelog
index 5f38aea..41fdf18 100644
--- a/Changelog
+++ b/Changelog
@@ -15,6 +15,7 @@ version <next>:
- ffserver supports codec private options
- creating DASH compatible fragmented MP4, MPEG-DASH segmenting muxer
- WebP muxer with animated WebP support
+- tdiff filter
version 2.4:
diff --git a/doc/filters.texi b/doc/filters.texi
index 8c16c7a..9882da7 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8394,6 +8394,10 @@ Useful for enlarging pixel art images without reducing
sharpness.
@section swapuv
Swap U & V plane.
+@section tdiff
+
+Show difference between consecutive frames.
+
@section telecine
Apply telecine process to the video.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 2c56e38..3217c99 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -97,6 +97,7 @@ OBJS-$(CONFIG_BLACKDETECT_FILTER) +=
vf_blackdetect.o
OBJS-$(CONFIG_BLACKFRAME_FILTER) += vf_blackframe.o
OBJS-$(CONFIG_BLEND_FILTER) += vf_blend.o dualinput.o
framesync.o
OBJS-$(CONFIG_BOXBLUR_FILTER) += vf_boxblur.o
+OBJS-$(CONFIG_CDIFF_FILTER) += vf_cdiff.o
OBJS-$(CONFIG_CODECVIEW_FILTER) += vf_codecview.o
OBJS-$(CONFIG_COLORBALANCE_FILTER) += vf_colorbalance.o
OBJS-$(CONFIG_COLORCHANNELMIXER_FILTER) += vf_colorchannelmixer.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 2352d44..4d065a9 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -201,6 +201,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(SUBTITLES, subtitles, vf);
REGISTER_FILTER(SUPER2XSAI, super2xsai, vf);
REGISTER_FILTER(SWAPUV, swapuv, vf);
+ REGISTER_FILTER(TDIFF, tdiff, vf);
REGISTER_FILTER(TELECINE, telecine, vf);
REGISTER_FILTER(THUMBNAIL, thumbnail, vf);
REGISTER_FILTER(TILE, tile, vf);
diff --git a/libavfilter/vf_tdiff.c b/libavfilter/vf_tdiff.c
new file mode 100644
index 0000000..82dceef
--- /dev/null
+++ b/libavfilter/vf_tdiff.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2014 Stefano Sabatini
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Consecutive frames diff filter.
+ */
+
+#include "libavutil/colorspace.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+#include "libavutil/eval.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/parseutils.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct {
+ const AVClass *class;
+ AVFrame *prev_frame;
+} TDiffContext;
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
+ };
+
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+ TDiffContext *tdiff = inlink->dst->priv;
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+
+ if (tdiff->prev_frame) {
+ int i, j;
+
+ AVFrame *diff = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ av_frame_copy_props(frame, diff);
+ if (!diff) {
+ av_frame_free(&frame);
+ return AVERROR(ENOMEM);
+ }
+
+ /* compute difference with previous frame */
+ for (i = 0; i < frame->height; i++) {
+ uint8_t *pdiff = diff ->data[0] + i * diff
->linesize[0];
+ uint8_t *pprev = tdiff->prev_frame->data[0] + i *
tdiff->prev_frame->linesize[0];
+ uint8_t *pthis = frame ->data[0] + i * frame
->linesize[0];
+ for (j = 0; j < frame->width; j++) {
+ *pdiff++ = abs(*pthis++ - *pprev++);
+ }
+ }
+
+ av_frame_free(&tdiff->prev_frame);
+ tdiff->prev_frame = frame;
+ return ff_filter_frame(outlink, diff);
+ }
+ tdiff->prev_frame = frame;
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ TDiffContext *tdiff = ctx->priv;
+ av_freep(&tdiff->prev_frame);
+}
+
+static const AVOption tdiff_options[] = {
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(tdiff);
+
+static const AVFilterPad tdiff_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ .needs_writable = 0,
+ },
+ { NULL }
+};
+
+static const AVFilterPad tdiff_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_tdiff = {
+ .name = "tdiff",
+ .description = NULL_IF_CONFIG_SMALL("Show difference with previous
frame."),
+ .priv_size = sizeof(TDiffContext),
+ .priv_class = &tdiff_class,
+ .query_formats = query_formats,
+ .uninit = uninit,
+ .inputs = tdiff_inputs,
+ .outputs = tdiff_outputs,
+};
--
1.8.3.2
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