lavfi/sidedata: add filter for manipulating frame side data

This is a similar filter to f_metadata, only it works on side data. Since
adding side data from a user provided arbitrary binary string is unsafe,
because current code assumes that a side data of a certain kind has the proper
size, this filter only implements selection and deletion. Also, no value
matching support is implemented yet, because there is no uniform way to specify
a side data textually.

Signed-off-by: Marton Balint <cus@passwd.hu>

1 files changed, 181 insertions, 0 deletions

diff --git a/libavfilter/f_sidedata.c b/libavfilter/f_sidedata.c
new file mode 100644
index 0000000000..4863cc94ec
--- /dev/null
+++ b/libavfilter/f_sidedata.c
@@ -0,0 +1,181 @@
+/*
+ * 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 side data
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/internal.h"
+#include "libavutil/frame.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+
+enum SideDataMode {
+    SIDEDATA_SELECT,
+    SIDEDATA_DELETE,
+    SIDEDATA_NB
+};
+
+typedef struct SideDataContext {
+    const AVClass *class;
+
+    int mode;
+    enum AVFrameSideDataType type;
+} SideDataContext;
+
+#define OFFSET(x) offsetof(SideDataContext, x)
+#define DEFINE_OPTIONS(filt_name, FLAGS) \
+static const AVOption filt_name##_options[] = { \
+    { "mode", "set a mode of operation", OFFSET(mode),   AV_OPT_TYPE_INT,    {.i64 = 0 }, 0, SIDEDATA_NB-1, FLAGS, "mode" }, \
+    {   "select", "select frame",        0,              AV_OPT_TYPE_CONST,  {.i64 = SIDEDATA_SELECT }, 0, 0, FLAGS, "mode" }, \
+    {   "delete", "delete side data",    0,              AV_OPT_TYPE_CONST,  {.i64 = SIDEDATA_DELETE }, 0, 0, FLAGS, "mode" }, \
+    { "type",   "set side data type",    OFFSET(type),   AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, INT_MAX, FLAGS, "type" }, \
+    {   "PANSCAN",                    "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_PANSCAN                    }, 0, 0, FLAGS, "type" }, \
+    {   "A53_CC",                     "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_A53_CC                     }, 0, 0, FLAGS, "type" }, \
+    {   "STEREO3D",                   "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_STEREO3D                   }, 0, 0, FLAGS, "type" }, \
+    {   "MATRIXENCODING",             "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_MATRIXENCODING             }, 0, 0, FLAGS, "type" }, \
+    {   "DOWNMIX_INFO",               "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_DOWNMIX_INFO               }, 0, 0, FLAGS, "type" }, \
+    {   "REPLAYGAIN",                 "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_REPLAYGAIN                 }, 0, 0, FLAGS, "type" }, \
+    {   "DISPLAYMATRIX",              "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_DISPLAYMATRIX              }, 0, 0, FLAGS, "type" }, \
+    {   "AFD",                        "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_AFD                        }, 0, 0, FLAGS, "type" }, \
+    {   "MOTION_VECTORS",             "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_MOTION_VECTORS             }, 0, 0, FLAGS, "type" }, \
+    {   "SKIP_SAMPLES",               "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_SKIP_SAMPLES               }, 0, 0, FLAGS, "type" }, \
+    {   "AUDIO_SERVICE_TYPE",         "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_AUDIO_SERVICE_TYPE         }, 0, 0, FLAGS, "type" }, \
+    {   "MASTERING_DISPLAY_METADATA", "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_MASTERING_DISPLAY_METADATA }, 0, 0, FLAGS, "type" }, \
+    {   "GOP_TIMECODE",               "", 0,             AV_OPT_TYPE_CONST,  {.i64 = AV_FRAME_DATA_GOP_TIMECODE               }, 0, 0, FLAGS, "type" }, \
+    { NULL } \
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    SideDataContext *s = ctx->priv;
+
+    if (s->type == -1 && s->mode != SIDEDATA_DELETE) {
+        av_log(ctx, AV_LOG_ERROR, "Side data type must be set\n");
+        return AVERROR(EINVAL);
+    }
+
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+    AVFilterContext *ctx = inlink->dst;
+    AVFilterLink *outlink = ctx->outputs[0];
+    SideDataContext *s = ctx->priv;
+    AVFrameSideData *sd = NULL;
+
+    if (s->type != -1)
+       sd = av_frame_get_side_data(frame, s->type);
+
+    switch (s->mode) {
+    case SIDEDATA_SELECT:
+        if (sd) {
+            return ff_filter_frame(outlink, frame);
+        }
+        break;
+    case SIDEDATA_DELETE:
+        if (s->type == -1) {
+            while (frame->nb_side_data)
+                av_frame_remove_side_data(frame, frame->side_data[0]->type);
+        } else if (sd) {
+            av_frame_remove_side_data(frame, s->type);
+        }
+        return ff_filter_frame(outlink, frame);
+        break;
+    default:
+        av_assert0(0);
+    };
+
+    av_frame_free(&frame);
+
+    return 0;
+}
+
+#if CONFIG_ASIDEDATA_FILTER
+
+DEFINE_OPTIONS(asidedata, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
+AVFILTER_DEFINE_CLASS(asidedata);
+
+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_asidedata = {
+    .name          = "asidedata",
+    .description   = NULL_IF_CONFIG_SMALL("Manipulate audio frame side data."),
+    .priv_size     = sizeof(SideDataContext),
+    .priv_class    = &asidedata_class,
+    .init          = init,
+    .query_formats = ff_query_formats_all,
+    .inputs        = ainputs,
+    .outputs       = aoutputs,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
+#endif /* CONFIG_ASIDEDATA_FILTER */
+
+#if CONFIG_SIDEDATA_FILTER
+
+DEFINE_OPTIONS(sidedata, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
+AVFILTER_DEFINE_CLASS(sidedata);
+
+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_sidedata = {
+    .name        = "sidedata",
+    .description = NULL_IF_CONFIG_SMALL("Manipulate video frame side data."),
+    .priv_size   = sizeof(SideDataContext),
+    .priv_class  = &sidedata_class,
+    .init        = init,
+    .inputs      = inputs,
+    .outputs     = outputs,
+    .flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
+#endif /* CONFIG_SIDEDATA_FILTER */