avcodec/libaomdec: auto insert dump_extra bitstream filter

Some containers, like Matroska, may propagate key frames with no Sequence
Header OBU since it's provided in extradata instead.
With this change, the Sequence Header will be appended to the packet data
before calling aom_codec_decode().
Signed-off-by: James Almer <jamrial@gmail.com>

configure

@@ -3049,6 +3049,7 @@ h264_videotoolbox_encoder_select="videotoolbox_encoder"
 hevc_videotoolbox_encoder_deps="pthreads"
 hevc_videotoolbox_encoder_select="videotoolbox_encoder"
 libaom_av1_decoder_deps="libaom"
+libaom_av1_decoder_select="dump_extradata_bsf"
 libaom_av1_encoder_deps="libaom"
 libaom_av1_encoder_select="extract_extradata_bsf"
 libcelt_decoder_deps="libcelt"

libavcodec/libaomdec.c

@@ -232,4 +232,5 @@ AVCodec ff_libaom_av1_decoder = {
     .capabilities   = AV_CODEC_CAP_AUTO_THREADS | AV_CODEC_CAP_DR1,
     .profiles       = NULL_IF_CONFIG_SMALL(ff_av1_profiles),
     .wrapper_name   = "libaom",
+    .bsfs           = "dump_extra",
 };