James Almer:
> Extradata included in packet side data is meant to replace the codec context
> extradata. So when muxing for example to MP4 without this change and if
> extradata is present in a packet side data, the result will be that the
> parameter sets present in keyframes will be filtered, but the parameter sets
> ultimately included in the av1C box will not.
>
> This is especially important for AV1 as both currently supported encoders
> don't
> export the Sequence Header in the codec context extradata, but as packet side
> data instead.
>
> Signed-off-by: James Almer <jamr...@gmail.com>
> ---
> libavcodec/av1_metadata_bsf.c | 52 +++++++++++++++++++++++++++++++++++
> 1 file changed, 52 insertions(+)
>
> diff --git a/libavcodec/av1_metadata_bsf.c b/libavcodec/av1_metadata_bsf.c
> index dd0c9b6148..f3161cb286 100644
> --- a/libavcodec/av1_metadata_bsf.c
> +++ b/libavcodec/av1_metadata_bsf.c
> @@ -111,6 +111,54 @@ static int
> av1_metadata_update_sequence_header(AVBSFContext *bsf,
> return 0;
> }
>
> +static int av1_metadata_update_side_data(AVBSFContext *bsf, AVPacket *pkt)
> +{
> + AV1MetadataContext *ctx = bsf->priv_data;
> + CodedBitstreamFragment *frag = &ctx->access_unit;
> + AV1RawOBU *obu;
> + uint8_t *side_data;
> + int side_data_size;
> + int err, i;
> +
> + side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
> + &side_data_size);
> + if (!side_data_size)
> + return 0;
> +
> + err = ff_cbs_read(ctx->cbc, frag, side_data, side_data_size);
> + if (err < 0) {
> + av_log(bsf, AV_LOG_ERROR, "Failed to read extradata from packet side
> data.\n");
> + goto fail;
You can actually return immediately in this whole function: The fragment
will be reset in the fail part of av1_metadata_filter().
> + }
> +
> + for (i = 0; i < frag->nb_units; i++) {
> + if (frag->units[i].type == AV1_OBU_SEQUENCE_HEADER) {
> + obu = frag->units[i].content;
> + err = av1_metadata_update_sequence_header(bsf,
> &obu->obu.sequence_header);
> + if (err < 0)
> + goto fail;
> + }
> + }
> +
> + err = ff_cbs_write_fragment_data(ctx->cbc, frag);
> + if (err < 0) {
> + av_log(bsf, AV_LOG_ERROR, "Failed to write extradata into packet
> side data.\n");
> + goto fail;
> + }
> +
> + side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
> frag->data_size);
> + if (!side_data) {
> + err = AVERROR(ENOMEM);
> + goto fail;
> + }
> + memcpy(side_data, frag->data, frag->data_size);
> +
> + err = 0;
> +fail:
> + ff_cbs_fragment_reset(ctx->cbc, frag);
> + return err;
> +}
> +
> static int av1_metadata_filter(AVBSFContext *bsf, AVPacket *pkt)
> {
> AV1MetadataContext *ctx = bsf->priv_data;
> @@ -122,6 +170,10 @@ static int av1_metadata_filter(AVBSFContext *bsf,
> AVPacket *pkt)
> if (err < 0)
> return err;
>
> + err = av1_metadata_update_side_data(bsf, pkt);
> + if (err < 0)
> + goto fail;
> +
> err = ff_cbs_read_packet(ctx->cbc, frag, pkt);
> if (err < 0) {
> av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
>
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