Hi,
patch attached.
From c719b95ce84bb1c3db3e6b751d80a840f35726b0 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <one...@gmail.com>
Date: Sat, 6 Feb 2016 11:19:45 +0100
Subject: [PATCH] avfilter: add metadata filters
Signed-off-by: Paul B Mahol <one...@gmail.com>
---
doc/filters.texi | 45 ++++++++++
libavfilter/Makefile | 2 +
libavfilter/allfilters.c | 2 +
libavfilter/f_metadata.c | 211 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 260 insertions(+)
create mode 100644 libavfilter/f_metadata.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 664ebe8..54ea63e 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8444,6 +8444,51 @@ format=rgb24,mergeplanes=0x000102:yuv444p
@end example
@end itemize
+@section metadata, ametadata
+
+Manipulate frames metadata.
+
+This filter accepts the following options:
+
+@table @option
+@item m
+Set mode of operation of the filter.
+
+Can be one of the following:
+
+@table @samp
+@item select
+If both @code{value} and @code{key} is set, select frame
+which have such metadata. If only @code{key} is set, select
+every frame that have such key in metadata.
+
+@item add
+Add new metadata @code{key} and @code{value}. If key is already available
+do nothing.
+
+@item modify
+Modify value of already present key.
+
+@item delete
+If @code{value} is set, delete only keys that have such value.
+Otherwise, delete key.
+
+@item print
+Print key and value if metadata was found.
+@end table
+
+@item key
+Set key used with all modes, Must be set.
+
+@item value
+Set metadata value which will be used. This option is mandatory for modify
+and add mode.
+
+@item length
+Set length of how much characters of two metadata values need to match to be
+considered same. Default is all available characters.
+@end table
+
@section mpdecimate
Drop frames that do not differ greatly from the previous frame in
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 8ffd693..664c773 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -39,6 +39,7 @@ OBJS-$(CONFIG_AINTERLEAVE_FILTER) += f_interleave.o
OBJS-$(CONFIG_ALIMITER_FILTER) += af_alimiter.o
OBJS-$(CONFIG_ALLPASS_FILTER) += af_biquads.o
OBJS-$(CONFIG_AMERGE_FILTER) += af_amerge.o
+OBJS-$(CONFIG_AMETADATA_FILTER) += f_metadata.o
OBJS-$(CONFIG_AMIX_FILTER) += af_amix.o
OBJS-$(CONFIG_ANULL_FILTER) += af_anull.o
OBJS-$(CONFIG_APAD_FILTER) += af_apad.o
@@ -186,6 +187,7 @@ OBJS-$(CONFIG_LUTYUV_FILTER) += vf_lut.o
OBJS-$(CONFIG_MASKEDMERGE_FILTER) += vf_maskedmerge.o framesync.o
OBJS-$(CONFIG_MCDEINT_FILTER) += vf_mcdeint.o
OBJS-$(CONFIG_MERGEPLANES_FILTER) += vf_mergeplanes.o framesync.o
+OBJS-$(CONFIG_METADATA_FILTER) += f_metadata.o
OBJS-$(CONFIG_MPDECIMATE_FILTER) += vf_mpdecimate.o
OBJS-$(CONFIG_NEGATE_FILTER) += vf_lut.o
OBJS-$(CONFIG_NNEDI_FILTER) += vf_nnedi.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index d4d37c9..f56b390 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -59,6 +59,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(ALIMITER, alimiter, af);
REGISTER_FILTER(ALLPASS, allpass, af);
REGISTER_FILTER(AMERGE, amerge, af);
+ REGISTER_FILTER(AMETADATA, ametadata, af);
REGISTER_FILTER(AMIX, amix, af);
REGISTER_FILTER(ANEQUALIZER, anequalizer, af);
REGISTER_FILTER(ANULL, anull, af);
@@ -207,6 +208,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(MASKEDMERGE, maskedmerge, vf);
REGISTER_FILTER(MCDEINT, mcdeint, vf);
REGISTER_FILTER(MERGEPLANES, mergeplanes, vf);
+ REGISTER_FILTER(METADATA, metadata, vf);
REGISTER_FILTER(MPDECIMATE, mpdecimate, vf);
REGISTER_FILTER(NEGATE, negate, vf);
REGISTER_FILTER(NNEDI, nnedi, vf);
diff --git a/libavfilter/f_metadata.c b/libavfilter/f_metadata.c
new file mode 100644
index 0000000..e248322
--- /dev/null
+++ b/libavfilter/f_metadata.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2016 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
+ */
+
+/**
+ * @file
+ * filter for manipulating frame metadata
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/avstring.h"
+#include "libavutil/eval.h"
+#include "libavutil/fifo.h"
+#include "libavutil/internal.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixelutils.h"
+#include "avfilter.h"
+#include "audio.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+enum MetadataMode {
+ METADATA_SELECT,
+ METADATA_ADD,
+ METADATA_MODIFY,
+ METADATA_DELETE,
+ METADATA_PRINT,
+ METADATA_NB
+};
+
+typedef struct MetadataContext {
+ const AVClass *class;
+
+ int mode;
+ char *key;
+ char *value;
+ int length;
+} MetadataContext;
+
+#define OFFSET(x) offsetof(MetadataContext, x)
+#define DEFINE_OPTIONS(filt_name, FLAGS) \
+static const AVOption filt_name##_options[] = { \
+ { "m", "set a mode of operation", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, METADATA_NB-1, FLAGS, "mode" }, \
+ { "select", "select frame", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_SELECT }, 0, 0, FLAGS, "mode" }, \
+ { "add", "add new metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_ADD }, 0, 0, FLAGS, "mode" }, \
+ { "modify", "modify metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_MODIFY }, 0, 0, FLAGS, "mode" }, \
+ { "delete", "delete metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_DELETE }, 0, 0, FLAGS, "mode" }, \
+ { "print", "print metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_PRINT }, 0, 0, FLAGS, "mode" }, \
+ { "key", "set metadata key", OFFSET(key), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
+ { "value", "set metadata value", OFFSET(value), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
+ { "length", "compare up to N chars", OFFSET(length), AV_OPT_TYPE_INT, {.i64 = INT_MAX }, 1, INT_MAX, FLAGS }, \
+ { NULL } \
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ MetadataContext *s = ctx->priv;
+
+ if (!s->key)
+ return AVERROR(EINVAL);
+
+ if ((s->mode == METADATA_MODIFY ||
+ s->mode == METADATA_ADD) && !s->value)
+ return AVERROR(EINVAL);
+
+ if (s->mode == METADATA_PRINT && s->value)
+ av_log(ctx, AV_LOG_WARNING, "Ignoring value parameter\n");
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ MetadataContext *s = ctx->priv;
+ AVDictionary *metadata = av_frame_get_metadata(frame);
+ AVDictionaryEntry *e;
+
+ if (!metadata)
+ return ff_filter_frame(outlink, frame);
+
+ e = av_dict_get(metadata, s->key, NULL, 0);
+
+ switch (s->mode) {
+ case METADATA_SELECT:
+ if (!s->value && e && e->value) {
+ return ff_filter_frame(outlink, frame);
+ } else if (s->value && e && e->value &&
+ !strncmp(s->value, e->value, s->length)) {
+ return ff_filter_frame(outlink, frame);
+ }
+ break;
+ case METADATA_ADD:
+ if (e && e->value) {
+ ;
+ } else {
+ av_dict_set(&metadata, s->key, s->value, 0);
+ }
+ return ff_filter_frame(outlink, frame);
+ break;
+ case METADATA_MODIFY:
+ if (e && e->value) {
+ av_dict_set(&metadata, s->key, s->value, 0);
+ }
+ return ff_filter_frame(outlink, frame);
+ break;
+ case METADATA_PRINT:
+ if (e && e->value)
+ av_log(ctx, AV_LOG_INFO, "%s=%s\n", s->key, e->value);
+ return ff_filter_frame(outlink, frame);
+ break;
+ case METADATA_DELETE:
+ if (e && e->value && s->value && !strncmp(s->value, e->value, s->length)) {
+ av_dict_set(&metadata, s->key, NULL, 0);
+ } else if (e && e->value) {
+ av_dict_set(&metadata, s->key, NULL, 0);
+ }
+ return ff_filter_frame(outlink, frame);
+ break;
+ default:
+ av_assert0(0);
+ };
+
+ av_frame_free(&frame);
+
+ return 0;
+}
+
+#if CONFIG_AMETADATA_FILTER
+
+DEFINE_OPTIONS(ametadata, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
+AVFILTER_DEFINE_CLASS(ametadata);
+
+static const AVFilterPad ainputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad aoutputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ },
+ { NULL }
+};
+
+AVFilter ff_af_ametadata = {
+ .name = "ametadata",
+ .description = NULL_IF_CONFIG_SMALL("Manipulate audio frames metadata."),
+ .priv_size = sizeof(MetadataContext),
+ .priv_class = &ametadata_class,
+ .init = init,
+ .inputs = ainputs,
+ .outputs = aoutputs,
+};
+#endif /* CONFIG_AMETADATA_FILTER */
+
+#if CONFIG_METADATA_FILTER
+
+DEFINE_OPTIONS(metadata, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
+AVFILTER_DEFINE_CLASS(metadata);
+
+static const AVFilterPad inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_metadata = {
+ .name = "metadata",
+ .description = NULL_IF_CONFIG_SMALL("Manipulate video frames metadata."),
+ .priv_size = sizeof(MetadataContext),
+ .priv_class = &metadata_class,
+ .init = init,
+ .inputs = inputs,
+ .outputs = outputs,
+};
+#endif /* CONFIG_METADATA_FILTER */
--
1.9.1
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
