lavc: Add h264_metadata bitstream filter

This is able to modify some header metadata found in the SPS/VUI,
and can also add/remove AUDs and insert user data in SEI NAL units.

(cherry picked from commit 9e93001b6135a23fe4e200196c08fb4fbffed6fc)
(cherry picked from commit c42b62d1f9641f10ffc23cad9abbe47d8a4a165b)

5 files changed, 590 insertions, 0 deletions

diff --git a/configure b/configure
index 74aac3a4f4..85889e62ed 100755
--- a/configure
+++ b/configure
@@ -2913,6 +2913,7 @@ mpeg4video_parser_select="h263dsp mpegvideo qpeldsp"
 vc1_parser_select="vc1dsp"
 
 # bitstream_filters
+h264_metadata_bsf_select="cbs_h264"
 mjpeg2jpeg_bsf_select="jpegtables"
 trace_headers_bsf_select="cbs_h264 cbs_h265 cbs_mpeg2"
 
diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi
index 990b4f3c58..f7dfa1f753 100644
--- a/doc/bitstream_filters.texi
+++ b/doc/bitstream_filters.texi
@@ -92,6 +92,69 @@ When this option is enabled, the long-term headers are removed from the
 bitstream after extraction.
 @end table
 
+@section h264_metadata
+
+Modify metadata embedded in an H.264 stream.
+
+@table @option
+@item aud
+Insert or remove AUD NAL units in all access units of the stream.
+
+@table @samp
+@item insert
+@item remove
+@end table
+
+@item sample_aspect_ratio
+Set the sample aspect ratio of the stream in the VUI parameters.
+
+@item video_format
+@item video_full_range_flag
+Set the video format in the stream (see H.264 section E.2.1 and
+table E-2).
+
+@item colour_primaries
+@item transfer_characteristics
+@item matrix_coefficients
+Set the colour description in the stream (see H.264 section E.2.1
+and tables E-3, E-4 and E-5).
+
+@item chroma_sample_loc_type
+Set the chroma sample location in the stream (see H.264 section
+E.2.1 and figure E-1).
+
+@item tick_rate
+Set the tick rate (num_units_in_tick / time_scale) in the VUI
+parameters.  This is the smallest time unit representable in the
+stream, and in many cases represents the field rate of the stream
+(double the frame rate).
+@item fixed_frame_rate_flag
+Set whether the stream has fixed framerate - typically this indicates
+that the framerate is exactly half the tick rate, but the exact
+meaning is dependent on interlacing and the picture structure (see
+H.264 section E.2.1 and table E-6).
+
+@item crop_left
+@item crop_right
+@item crop_top
+@item crop_bottom
+Set the frame cropping offsets in the SPS.  These values will replace
+the current ones if the stream is already cropped.
+
+These fields are set in pixels.  Note that some sizes may not be
+representable if the chroma is subsampled or the stream is interlaced
+(see H.264 section 7.4.2.1.1).
+
+@item sei_user_data
+Insert a string as SEI unregistered user data.  The argument must
+be of the form @emph{UUID+string}, where the UUID is as hex digits
+possibly separated by hyphens, and the string can be anything.
+
+For example, @samp{086f3693-b7b3-4f2c-9653-21492feee5b8+hello} will
+insert the string ``hello'' associated with the given UUID.
+
+@end table
+
 @section h264_mp4toannexb
 
 Convert an H.264 bitstream from length prefixed mode to start code
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 5e09889bc6..25ad785dbe 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -1015,6 +1015,7 @@ OBJS-$(CONFIG_DUMP_EXTRADATA_BSF)         += dump_extradata_bsf.o
 OBJS-$(CONFIG_DCA_CORE_BSF)               += dca_core_bsf.o
 OBJS-$(CONFIG_EXTRACT_EXTRADATA_BSF)      += extract_extradata_bsf.o    \
                                              h2645_parse.o
+OBJS-$(CONFIG_H264_METADATA_BSF)          += h264_metadata_bsf.o
 OBJS-$(CONFIG_H264_MP4TOANNEXB_BSF)       += h264_mp4toannexb_bsf.o
 OBJS-$(CONFIG_HEVC_MP4TOANNEXB_BSF)       += hevc_mp4toannexb_bsf.o
 OBJS-$(CONFIG_IMX_DUMP_HEADER_BSF)        += imx_dump_header_bsf.o
diff --git a/libavcodec/bitstream_filters.c b/libavcodec/bitstream_filters.c
index dd0247182b..0e133b9036 100644
--- a/libavcodec/bitstream_filters.c
+++ b/libavcodec/bitstream_filters.c
@@ -29,6 +29,7 @@ extern const AVBitStreamFilter ff_chomp_bsf;
 extern const AVBitStreamFilter ff_dump_extradata_bsf;
 extern const AVBitStreamFilter ff_dca_core_bsf;
 extern const AVBitStreamFilter ff_extract_extradata_bsf;
+extern const AVBitStreamFilter ff_h264_metadata_bsf;
 extern const AVBitStreamFilter ff_h264_mp4toannexb_bsf;
 extern const AVBitStreamFilter ff_hevc_mp4toannexb_bsf;
 extern const AVBitStreamFilter ff_imx_dump_header_bsf;
diff --git a/libavcodec/h264_metadata_bsf.c b/libavcodec/h264_metadata_bsf.c
new file mode 100644
index 0000000000..496f7f00fe
--- /dev/null
+++ b/libavcodec/h264_metadata_bsf.c
@@ -0,0 +1,524 @@
+/*
+ * 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/avstring.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+
+#include "bsf.h"
+#include "cbs.h"
+#include "cbs_h264.h"
+#include "h264.h"
+#include "h264_sei.h"
+
+enum {
+    PASS,
+    INSERT,
+    REMOVE,
+};
+
+typedef struct H264MetadataContext {
+    const AVClass *class;
+
+    CodedBitstreamContext *cbc;
+    CodedBitstreamFragment access_unit;
+
+    H264RawAUD aud_nal;
+    H264RawSEI sei_nal;
+
+    int aud;
+
+    AVRational sample_aspect_ratio;
+
+    int video_format;
+    int video_full_range_flag;
+    int colour_primaries;
+    int transfer_characteristics;
+    int matrix_coefficients;
+
+    int chroma_sample_loc_type;
+
+    AVRational tick_rate;
+    int fixed_frame_rate_flag;
+
+    int crop_left;
+    int crop_right;
+    int crop_top;
+    int crop_bottom;
+
+    const char *sei_user_data;
+    int sei_first_au;
+} H264MetadataContext;
+
+
+static int h264_metadata_update_sps(AVBSFContext *bsf,
+                                    H264RawSPS *sps)
+{
+    H264MetadataContext *ctx = bsf->priv_data;
+    int need_vui = 0;
+    int crop_unit_x, crop_unit_y;
+
+    if (ctx->sample_aspect_ratio.num && ctx->sample_aspect_ratio.den) {
+        // Table E-1.
+        static const AVRational sar_idc[] = {
+            {   0,  0 }, // Unspecified (never written here).
+            {   1,  1 }, {  12, 11 }, {  10, 11 }, {  16, 11 },
+            {  40, 33 }, {  24, 11 }, {  20, 11 }, {  32, 11 },
+            {  80, 33 }, {  18, 11 }, {  15, 11 }, {  64, 33 },
+            { 160, 99 }, {   4,  3 }, {   3,  2 }, {   2,  1 },
+        };
+        int num, den, i;
+
+        av_reduce(&num, &den, ctx->sample_aspect_ratio.num,
+                  ctx->sample_aspect_ratio.den, 65535);
+
+        for (i = 1; i < FF_ARRAY_ELEMS(sar_idc); i++) {
+            if (num == sar_idc[i].num &&
+                den == sar_idc[i].den)
+                break;
+        }
+        if (i == FF_ARRAY_ELEMS(sar_idc)) {
+            sps->vui.aspect_ratio_idc = 255;
+            sps->vui.sar_width  = num;
+            sps->vui.sar_height = den;
+        } else {
+            sps->vui.aspect_ratio_idc = i;
+        }
+        sps->vui.aspect_ratio_info_present_flag = 1;
+        need_vui = 1;
+    }
+
+#define SET_OR_INFER(field, value, present_flag, infer) do { \
+        if (value >= 0) { \
+            field = value; \
+            need_vui = 1; \
+        } else if (!present_flag) \
+            field = infer; \
+    } while (0)
+
+    if (ctx->video_format             >= 0 ||
+        ctx->video_full_range_flag    >= 0 ||
+        ctx->colour_primaries         >= 0 ||
+        ctx->transfer_characteristics >= 0 ||
+        ctx->matrix_coefficients      >= 0) {
+
+        SET_OR_INFER(sps->vui.video_format, ctx->video_format,
+                     sps->vui.video_signal_type_present_flag, 5);
+
+        SET_OR_INFER(sps->vui.video_full_range_flag,
+                     ctx->video_full_range_flag,
+                     sps->vui.video_signal_type_present_flag, 0);
+
+        if (ctx->colour_primaries         >= 0 ||
+            ctx->transfer_characteristics >= 0 ||
+            ctx->matrix_coefficients      >= 0) {
+
+            SET_OR_INFER(sps->vui.colour_primaries,
+                         ctx->colour_primaries,
+                         sps->vui.colour_description_present_flag, 2);
+
+            SET_OR_INFER(sps->vui.transfer_characteristics,
+                         ctx->transfer_characteristics,
+                         sps->vui.colour_description_present_flag, 2);
+
+            SET_OR_INFER(sps->vui.matrix_coefficients,
+                         ctx->matrix_coefficients,
+                         sps->vui.colour_description_present_flag, 2);
+
+            sps->vui.colour_description_present_flag = 1;
+        }
+        sps->vui.video_signal_type_present_flag = 1;
+        need_vui = 1;
+    }
+
+    if (ctx->chroma_sample_loc_type >= 0) {
+        sps->vui.chroma_sample_loc_type_top_field =
+            ctx->chroma_sample_loc_type;
+        sps->vui.chroma_sample_loc_type_bottom_field =
+            ctx->chroma_sample_loc_type;
+        sps->vui.chroma_loc_info_present_flag = 1;
+        need_vui = 1;
+    }
+
+    if (ctx->tick_rate.num && ctx->tick_rate.den) {
+        int num, den;
+
+        av_reduce(&num, &den, ctx->tick_rate.num, ctx->tick_rate.den,
+                  UINT32_MAX > INT_MAX ? UINT32_MAX : INT_MAX);
+
+        sps->vui.time_scale        = num;
+        sps->vui.num_units_in_tick = den;
+
+        sps->vui.timing_info_present_flag = 1;
+        need_vui = 1;
+    }
+    SET_OR_INFER(sps->vui.fixed_frame_rate_flag,
+                 ctx->fixed_frame_rate_flag,
+                 sps->vui.timing_info_present_flag, 0);
+
+    if (sps->separate_colour_plane_flag || sps->chroma_format_idc == 0) {
+        crop_unit_x = 1;
+        crop_unit_y = 2 - sps->frame_mbs_only_flag;
+    } else {
+        crop_unit_x = 1 + (sps->chroma_format_idc < 3);
+        crop_unit_y = (1 + (sps->chroma_format_idc < 2)) *
+                       (2 - sps->frame_mbs_only_flag);
+    }
+#define CROP(border, unit) do { \
+        if (ctx->crop_ ## border >= 0) { \
+            if (ctx->crop_ ## border % unit != 0) { \
+                av_log(bsf, AV_LOG_ERROR, "Invalid value for crop_%s: " \
+                       "must be a multiple of %d.\n", #border, unit); \
+                return AVERROR(EINVAL); \
+            } \
+            sps->frame_crop_ ## border ## _offset = \
+                  ctx->crop_ ## border / unit; \
+            sps->frame_cropping_flag = 1; \
+        } \
+    } while (0)
+    CROP(left,   crop_unit_x);
+    CROP(right,  crop_unit_x);
+    CROP(top,    crop_unit_y);
+    CROP(bottom, crop_unit_y);
+#undef CROP
+
+    if (need_vui)
+        sps->vui_parameters_present_flag = 1;
+
+    return 0;
+}
+
+static int h264_metadata_filter(AVBSFContext *bsf, AVPacket *out)
+{
+    H264MetadataContext *ctx = bsf->priv_data;
+    AVPacket *in = NULL;
+    CodedBitstreamFragment *au = &ctx->access_unit;
+    int err, i, j, has_sps;
+    char *sei_udu_string = NULL;
+
+    err = ff_bsf_get_packet(bsf, &in);
+    if (err < 0)
+        goto fail;
+
+    err = ff_cbs_read_packet(ctx->cbc, au, in);
+    if (err < 0) {
+        av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
+        goto fail;
+    }
+
+    if (au->nb_units == 0) {
+        av_log(bsf, AV_LOG_ERROR, "No NAL units in packet.\n");
+        err = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    // If an AUD is present, it must be the first NAL unit.
+    if (au->units[0].type == H264_NAL_AUD) {
+        if (ctx->aud == REMOVE)
+            ff_cbs_delete_unit(ctx->cbc, au, 0);
+    } else {
+        if (ctx->aud == INSERT) {
+            static const int primary_pic_type_table[] = {
+                0x084, // 2, 7
+                0x0a5, // 0, 2, 5, 7
+                0x0e7, // 0, 1, 2, 5, 6, 7
+                0x210, // 4, 9
+                0x318, // 3, 4, 8, 9
+                0x294, // 2, 4, 7, 9
+                0x3bd, // 0, 2, 3, 4, 5, 7, 8, 9
+                0x3ff, // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
+            };
+            int primary_pic_type_mask = 0xff;
+            H264RawAUD *aud = &ctx->aud_nal;
+
+            for (i = 0; i < au->nb_units; i++) {
+                if (au->units[i].type == H264_NAL_SLICE ||
+                    au->units[i].type == H264_NAL_IDR_SLICE) {
+                    H264RawSlice *slice = au->units[i].content;
+                    for (j = 0; j < FF_ARRAY_ELEMS(primary_pic_type_table); j++) {
+                         if (!(primary_pic_type_table[j] &
+                               (1 << slice->header.slice_type)))
+                             primary_pic_type_mask &= ~(1 << j);
+                    }
+                }
+            }
+            for (j = 0; j < FF_ARRAY_ELEMS(primary_pic_type_table); j++)
+                if (primary_pic_type_mask & (1 << j))
+                    break;
+            if (j >= FF_ARRAY_ELEMS(primary_pic_type_table)) {
+                av_log(bsf, AV_LOG_ERROR, "No usable primary_pic_type: "
+                       "invalid slice types?\n");
+                err = AVERROR_INVALIDDATA;
+                goto fail;
+            }
+
+            aud->nal_unit_header.nal_unit_type = H264_NAL_AUD;
+            aud->primary_pic_type = j;
+
+            err = ff_cbs_insert_unit_content(ctx->cbc, au,
+                                             0, H264_NAL_AUD, aud);
+            if (err < 0) {
+                av_log(bsf, AV_LOG_ERROR, "Failed to insert AUD.\n");
+                goto fail;
+            }
+        }
+    }
+
+    has_sps = 0;
+    for (i = 0; i < au->nb_units; i++) {
+        if (au->units[i].type == H264_NAL_SPS) {
+            err = h264_metadata_update_sps(bsf, au->units[i].content);
+            if (err < 0)
+                goto fail;
+            has_sps = 1;
+        }
+    }
+
+    // Insert the SEI in access units containing SPSs, and also
+    // unconditionally in the first access unit we ever see.
+    if (ctx->sei_user_data && (has_sps || !ctx->sei_first_au)) {
+        H264RawSEI *sei;
+        H264RawSEIPayload *payload;
+        H264RawSEIUserDataUnregistered *udu;
+        int sei_pos, sei_new;
+
+        ctx->sei_first_au = 1;
+
+        for (i = 0; i < au->nb_units; i++) {
+            if (au->units[i].type == H264_NAL_SEI ||
+                au->units[i].type == H264_NAL_SLICE ||
+                au->units[i].type == H264_NAL_IDR_SLICE)
+                break;
+        }
+        sei_pos = i;
+
+        if (sei_pos < au->nb_units &&
+            au->units[sei_pos].type == H264_NAL_SEI) {
+            sei_new = 0;
+            sei = au->units[sei_pos].content;
+        } else {
+            sei_new = 1;
+            sei = &ctx->sei_nal;
+            memset(sei, 0, sizeof(*sei));
+
+            sei->nal_unit_header.nal_unit_type = H264_NAL_SEI;
+
+            err = ff_cbs_insert_unit_content(ctx->cbc, au,
+                                             sei_pos, H264_NAL_SEI, sei);
+            if (err < 0) {
+                av_log(bsf, AV_LOG_ERROR, "Failed to insert SEI.\n");
+                goto fail;
+            }
+        }
+
+        payload = &sei->payload[sei->payload_count];
+
+        payload->payload_type = H264_SEI_TYPE_USER_DATA_UNREGISTERED;
+        udu = &payload->payload.user_data_unregistered;
+
+        for (i = j = 0; j < 32 && ctx->sei_user_data[i]; i++) {
+            int c, v;
+            c = ctx->sei_user_data[i];
+            if (c == '-') {
+                continue;
+            } else if (av_isxdigit(c)) {
+                c = av_tolower(c);
+                v = (c <= '9' ? c - '0' : c - 'a' + 10);
+            } else {
+                goto invalid_user_data;
+            }
+            if (i & 1)
+                udu->uuid_iso_iec_11578[j / 2] |= v;
+            else
+                udu->uuid_iso_iec_11578[j / 2] = v << 4;
+            ++j;
+        }
+        if (j == 32 && ctx->sei_user_data[i] == '+') {
+            sei_udu_string = av_strdup(ctx->sei_user_data + i + 1);
+            if (!sei_udu_string) {
+                err = AVERROR(ENOMEM);
+                goto sei_fail;
+            }
+
+            udu->data = sei_udu_string;
+            udu->data_length = strlen(sei_udu_string);
+
+            payload->payload_size = 16 + udu->data_length;
+
+            if (!sei_new) {
+                // This will be freed by the existing internal
+                // reference in fragment_uninit().
+                sei_udu_string = NULL;
+            }
+
+        } else {
+        invalid_user_data:
+            av_log(bsf, AV_LOG_ERROR, "Invalid user data: "
+                   "must be \"UUID+string\".\n");
+            err = AVERROR(EINVAL);
+        sei_fail:
+            memset(payload, 0, sizeof(&payload));
+            goto fail;
+        }
+
+        ++sei->payload_count;
+    }
+
+    err = ff_cbs_write_packet(ctx->cbc, out, au);
+    if (err < 0) {
+        av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
+        goto fail;
+    }
+
+    err = av_packet_copy_props(out, in);
+    if (err < 0)
+        goto fail;
+
+    err = 0;
+fail:
+    ff_cbs_fragment_uninit(ctx->cbc, au);
+    av_freep(&sei_udu_string);
+
+    av_packet_free(&in);
+
+    return err;
+}
+
+static int h264_metadata_init(AVBSFContext *bsf)
+{
+    H264MetadataContext *ctx = bsf->priv_data;
+    CodedBitstreamFragment *au = &ctx->access_unit;
+    int err, i;
+
+    err = ff_cbs_init(&ctx->cbc, AV_CODEC_ID_H264, bsf);
+    if (err < 0)
+        return err;
+
+    if (bsf->par_in->extradata) {
+        err = ff_cbs_read_extradata(ctx->cbc, au, bsf->par_in);
+        if (err < 0) {
+            av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
+            goto fail;
+        }
+
+        for (i = 0; i < au->nb_units; i++) {
+            if (au->units[i].type == H264_NAL_SPS) {
+                err = h264_metadata_update_sps(bsf, au->units[i].content);
+                if (err < 0)
+                    goto fail;
+            }
+        }
+
+        err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, au);
+        if (err < 0) {
+            av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
+            goto fail;
+        }
+    }
+
+    err = 0;
+fail:
+    ff_cbs_fragment_uninit(ctx->cbc, au);
+    return err;
+}
+
+static void h264_metadata_close(AVBSFContext *bsf)
+{
+    H264MetadataContext *ctx = bsf->priv_data;
+    ff_cbs_close(&ctx->cbc);
+}
+
+#define OFFSET(x) offsetof(H264MetadataContext, x)
+static const AVOption h264_metadata_options[] = {
+    { "aud", "Access Unit Delimiter NAL units",
+        OFFSET(aud), AV_OPT_TYPE_INT,
+        { .i64 = PASS }, PASS, REMOVE, 0, "aud" },
+    { "pass",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PASS   }, .unit = "aud" },
+    { "insert", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = INSERT }, .unit = "aud" },
+    { "remove", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE }, .unit = "aud" },
+
+    { "sample_aspect_ratio", "Set sample aspect ratio (table E-1)",
+        OFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL,
+        { .dbl = 0.0 }, 0, 65535 },
+
+    { "video_format", "Set video format (table E-2)",
+        OFFSET(video_format), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 7 },
+    { "video_full_range_flag", "Set video full range flag",
+        OFFSET(video_full_range_flag), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 1 },
+    { "colour_primaries", "Set colour primaries (table E-3)",
+        OFFSET(colour_primaries), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 255 },
+    { "transfer_characteristics", "Set transfer characteristics (table E-4)",
+        OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 255 },
+    { "matrix_coefficients", "Set matrix coefficients (table E-5)",
+        OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 255 },
+
+    { "chroma_sample_loc_type", "Set chroma sample location type (figure E-1)",
+        OFFSET(chroma_sample_loc_type), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 6 },
+
+    { "tick_rate", "Set VUI tick rate (num_units_in_tick / time_scale)",
+        OFFSET(tick_rate), AV_OPT_TYPE_RATIONAL,
+        { .dbl = 0.0 }, 0, UINT_MAX },
+    { "fixed_frame_rate_flag", "Set VUI fixed frame rate flag",
+        OFFSET(fixed_frame_rate_flag), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 1 },
+
+    { "crop_left", "Set left border crop offset",
+        OFFSET(crop_left), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, H264_MAX_WIDTH },
+    { "crop_right", "Set right border crop offset",
+        OFFSET(crop_right), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, H264_MAX_WIDTH },
+    { "crop_top", "Set top border crop offset",
+        OFFSET(crop_top), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, H264_MAX_HEIGHT },
+    { "crop_bottom", "Set bottom border crop offset",
+        OFFSET(crop_bottom), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, H264_MAX_HEIGHT },
+
+    { "sei_user_data", "Insert SEI user data (UUID+string)",
+        OFFSET(sei_user_data), AV_OPT_TYPE_STRING, { .str = NULL } },
+
+    { NULL }
+};
+
+static const AVClass h264_metadata_class = {
+    .class_name = "h264_metadata_bsf",
+    .item_name  = av_default_item_name,
+    .option     = h264_metadata_options,
+    .version    = LIBAVCODEC_VERSION_MAJOR,
+};
+
+static const enum AVCodecID h264_metadata_codec_ids[] = {
+    AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
+};
+
+const AVBitStreamFilter ff_h264_metadata_bsf = {
+    .name           = "h264_metadata",
+    .priv_data_size = sizeof(H264MetadataContext),
+    .priv_class     = &h264_metadata_class,
+    .init           = &h264_metadata_init,
+    .close          = &h264_metadata_close,
+    .filter         = &h264_metadata_filter,
+    .codec_ids      = h264_metadata_codec_ids,
+};