avcodec: add Metadata bsf for H266/VVC

Add H.266/VVC metadata bsf.

Signed-off-by: James Almer <jamrial@gmail.com>

5 files changed, 153 insertions, 0 deletions

diff --git a/Changelog b/Changelog
index e9cbce7e1c..7974413627 100644
--- a/Changelog
+++ b/Changelog
@@ -23,6 +23,7 @@ version <next>:
 - Microsoft RLE video encoder
 - Raw AC-4 muxer and demuxer
 - Raw VVC bitstream parser
+- Bitstream filter for editing metadata in VVC streams
 
 version 6.0:
 - Radiance HDR image support
diff --git a/configure b/configure
index 10d12770d6..107d533b3e 100755
--- a/configure
+++ b/configure
@@ -3352,6 +3352,7 @@ mjpeg2jpeg_bsf_select="jpegtables"
 mpeg2_metadata_bsf_select="cbs_mpeg2"
 trace_headers_bsf_select="cbs"
 vp9_metadata_bsf_select="cbs_vp9"
+vvc_metadata_bsf_select="cbs_h266"
 
 # external libraries
 aac_at_decoder_deps="audiotoolbox"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index b915464b90..6faa47d1cb 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -1261,6 +1261,7 @@ OBJS-$(CONFIG_VP9_METADATA_BSF)           += vp9_metadata_bsf.o
 OBJS-$(CONFIG_VP9_RAW_REORDER_BSF)        += vp9_raw_reorder_bsf.o
 OBJS-$(CONFIG_VP9_SUPERFRAME_BSF)         += vp9_superframe_bsf.o
 OBJS-$(CONFIG_VP9_SUPERFRAME_SPLIT_BSF)   += vp9_superframe_split_bsf.o
+OBJS-$(CONFIG_VVC_METADATA_BSF)           += h266_metadata_bsf.o
 OBJS-$(CONFIG_EVC_FRAME_MERGE_BSF)        += evc_frame_merge_bsf.o
 
 # thread libraries
diff --git a/libavcodec/bitstream_filters.c b/libavcodec/bitstream_filters.c
index 7512fccc78..0d3f52260e 100644
--- a/libavcodec/bitstream_filters.c
+++ b/libavcodec/bitstream_filters.c
@@ -65,6 +65,7 @@ extern const FFBitStreamFilter ff_vp9_metadata_bsf;
 extern const FFBitStreamFilter ff_vp9_raw_reorder_bsf;
 extern const FFBitStreamFilter ff_vp9_superframe_bsf;
 extern const FFBitStreamFilter ff_vp9_superframe_split_bsf;
+extern const FFBitStreamFilter ff_vvc_metadata_bsf;
 extern const FFBitStreamFilter ff_evc_frame_merge_bsf;
 
 #include "libavcodec/bsf_list.c"
diff --git a/libavcodec/h266_metadata_bsf.c b/libavcodec/h266_metadata_bsf.c
new file mode 100644
index 0000000000..18fa1a5c9c
--- /dev/null
+++ b/libavcodec/h266_metadata_bsf.c
@@ -0,0 +1,149 @@
+/*
+ * 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/common.h"
+#include "libavutil/opt.h"
+
+#include "bsf.h"
+#include "bsf_internal.h"
+#include "cbs.h"
+#include "cbs_bsf.h"
+#include "cbs_h266.h"
+#include "vvc.h"
+
+#define IS_H266_SLICE(nut) (nut <= VVC_RASL_NUT || (nut >= VVC_IDR_W_RADL && nut <= VVC_GDR_NUT))
+
+typedef struct H266MetadataContext {
+    CBSBSFContext common;
+
+    H266RawAUD aud_nal;
+
+    int aud;
+} H266MetadataContext;
+
+static int h266_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt,
+                                         CodedBitstreamFragment *pu)
+{
+    H266MetadataContext *ctx = bsf->priv_data;
+    int err, i;
+
+    // If an AUD is present, it must be the first NAL unit.
+    if (pu->units[0].type == VVC_AUD_NUT) {
+        if (ctx->aud == BSF_ELEMENT_REMOVE)
+            ff_cbs_delete_unit(pu, 0);
+    } else if ( pkt && ctx->aud == BSF_ELEMENT_INSERT) {
+        const H266RawSlice *first_slice = NULL;
+        const H266RawPH *ph = NULL;
+        H266RawAUD *aud = &ctx->aud_nal;
+        int pic_type = 0, temporal_id = 8, layer_id = 0;
+        for (i = 0; i < pu->nb_units; i++) {
+            const H266RawNALUnitHeader *nal = pu->units[i].content;
+            if (!nal)
+                continue;
+            if (nal->nuh_temporal_id_plus1 < temporal_id + 1)
+                temporal_id = nal->nuh_temporal_id_plus1 - 1;
+            if ( nal->nal_unit_type == VVC_PH_NUT ) {
+                ph = pu->units[i].content;
+            } else if (IS_H266_SLICE(nal->nal_unit_type)) {
+                const H266RawSlice *slice = pu->units[i].content;
+                layer_id = nal->nuh_layer_id;
+                if (slice->header.sh_slice_type == VVC_SLICE_TYPE_B &&
+                    pic_type < 2)
+                    pic_type = 2;
+                if (slice->header.sh_slice_type == VVC_SLICE_TYPE_P &&
+                    pic_type < 1)
+                    pic_type = 1;
+                if (!first_slice) {
+                    first_slice = slice;
+                    if (first_slice->header.
+                        sh_picture_header_in_slice_header_flag)
+                        ph = &first_slice->header.sh_picture_header;
+                    else if (!ph)
+                        break;
+                }
+            }
+        }
+        if (!ph) {
+            av_log(bsf, AV_LOG_ERROR, "no avaliable picture header");
+            return AVERROR_INVALIDDATA;
+        }
+
+        aud->nal_unit_header = (H266RawNALUnitHeader) {
+            .nal_unit_type         = VVC_AUD_NUT,
+            .nuh_layer_id          = layer_id,
+            .nuh_temporal_id_plus1 = temporal_id + 1,
+        };
+        aud->aud_pic_type = pic_type;
+        aud->aud_irap_or_gdr_flag = ph->ph_gdr_or_irap_pic_flag;
+
+        err = ff_cbs_insert_unit_content(pu, 0, VVC_AUD_NUT, aud, NULL);
+        if (err < 0) {
+            av_log(bsf, AV_LOG_ERROR, "Failed to insert AUD.\n");
+            return err;
+        }
+    }
+
+    /* TODO: implement more metadata parsing, like VUI, Levels etc. */
+    //for (i = 0; i < pu->nb_units; i++) {
+    //    if (pu->units[i].type == VVC_SPS_NUT) {
+    //    }
+    //}
+    return 0;
+}
+
+static const CBSBSFType h266_metadata_type = {
+    .codec_id        = AV_CODEC_ID_VVC,
+    .fragment_name   = "access unit",
+    .unit_name       = "NAL unit",
+    .update_fragment = &h266_metadata_update_fragment,
+};
+
+static int h266_metadata_init(AVBSFContext *bsf)
+{
+    return ff_cbs_bsf_generic_init(bsf, &h266_metadata_type);
+}
+
+#define OFFSET(x) offsetof(H266MetadataContext, x)
+#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
+static const AVOption h266_metadata_options[] = {
+    BSF_ELEMENT_OPTIONS_PIR("aud", "Access Unit Delimiter NAL units",
+                            aud, FLAGS),
+
+    { NULL }
+};
+
+static const AVClass h266_metadata_class = {
+    .class_name = "h266_metadata_bsf",
+    .item_name  = av_default_item_name,
+    .option     = h266_metadata_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static const enum AVCodecID h266_metadata_codec_ids[] = {
+    AV_CODEC_ID_VVC, AV_CODEC_ID_NONE,
+};
+
+const FFBitStreamFilter ff_vvc_metadata_bsf = {
+    .p.name         = "vvc_metadata",
+    .p.codec_ids    = h266_metadata_codec_ids,
+    .p.priv_class   = &h266_metadata_class,
+    .priv_data_size = sizeof(H266MetadataContext),
+    .init           = &h266_metadata_init,
+    .close          = &ff_cbs_bsf_generic_close,
+    .filter         = &ff_cbs_bsf_generic_filter,
+};