https://gitlab.synchro.net/main/sbbs/-/commit/1b43af44a0a5d5b2e4a9fe7b
Added Files:
src/sbbs3/termaudio_cache.cpp
Modified Files:
src/sbbs3/main.cpp objects.mk sbbs.h sbbs.jsdocs.vcxproj sbbs.vcxproj termaudio.h
Log Message:
Track what the terminal already holds in its audio file cache

SyncTERM's C;S cache is a directory on the client's own disk, keyed by dialing-directory entry, and it survives disconnect. So a sound file needs uploading once per client machine rather than once per session, which is
what makes background music practical at all.

One C;L query per session records what is already there. It is issued by
the server and only by the server: putmsg() strips C;L out of displayed
text precisely so untrusted text cannot elicit a reply and desynchronize
the input stream, and that guarantee holds only while nothing else can
trigger the query.

Cache entries are named for the hash of their contents, so editing a file without renaming it produces a new entry rather than leaving a stale copy playing forever. That also removes any need to compare digests against the
C;L reply: absence of the name is the miss.

A missing, truncated or malformed reply leaves the list empty, so every
file uploads. Failing that way costs bandwidth; failing the other way
would play silence indefinitely with no diagnostic.

Also adds the APC emitters for load, queue, flush and channel volume. The channel conventions are fixed in termaudio.h because exec/load/cterm_lib.js writes to the same terminal and the two must agree: 2 for music, 3 through
15 rotating for effects.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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