upipe_filter_vanc: add SMPTE ST 2031 unpacking#1177
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Adds a new st2031 subpipe that unpacks DVB/SCTE VBI data_field() structures carried in VANC (DID=0x41, SDID=0x08) per SMPTE ST 2031:2015. Each ANC packet contributes one data unit (data_unit_id + data_field()) into a per-frame DVB VBI block, output as block.dvb_teletext.pic.sub. on the new subpipe. Bytes are passed verbatim (no bit reversal), and MPEG stuffing units (0xFF) are skipped. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Adds a new st2031 subpipe that unpacks DVB/SCTE VBI data_field() structures carried in VANC (DID=0x41, SDID=0x08) per SMPTE ST 2031:2015.
Each ANC packet contributes one data unit (data_unit_id + data_field()) into a per-frame DVB VBI block, output as block.dvb_teletext.pic.sub. on the new subpipe. Bytes are passed verbatim (no bit reversal), and MPEG stuffing units (0xFF) are skipped.