https://gitlab.synchro.net/main/sbbs/-/commit/8d9808e2b1b3f0c5ab2fe126
Added Files:
src/doors/syncconquer/door/vqaaudio_termgfx.cpp
Modified Files:
src/doors/syncconquer/CMakeLists.txt PROVENANCE.md src/doors/syncconquer/vanilla/redalert/init.cpp src/doors/termgfx/audio_mgr.c audio_mgr.h
Log Message:
syncalert: FMV cutscene audio over the terminal

Red Alert's VQA cutscenes played silent in the door. Anim_Init() enabled captions and EVA but never VQAOPTF_AUDIO, so the VQA loader decoded no
audio at all; and the vendored common/vqaaudio_null.cpp stubbed the whole
audio backend. This gives the cutscenes their dialog and effects.

New door/vqaaudio_termgfx.cpp replaces the vqaaudio_null stub (swapped in
the door CMake). It accumulates each decoded VQA audio block and ships it
to the client through a new termgfx streaming path -- Store, Load, then
A;Queue onto the SyncTERM music-channel FIFO -- so the chunks play back
to back. Decode is never paused: the player's frame display rides the
same loop, so pausing it to throttle audio would stutter the video;
instead a throttle bounds how far the client FIFO is allowed to run
ahead of playback.

A/V pacing rides the door's true monotonic wall clock (door_io_now_ms),
driving BOTH the movie's VQA_GetTime (which the drawer paces frames on)
and the audio-ship throttle, so video and audio stay locked in real
time. The vendored 60Hz TimerClass is deliberately not used for this:
its tick count is delta_ms / (1000/60), and 1000/60 truncates to 16, so
it runs ~4% fast -- enough to race the video ahead of the real-time
audio over a minute or two. This mirrors the OpenAL backend, whose
VQA_GetTime derives from the audio device's real playback position.

The new shared termgfx API termgfx_audio_stream_chunk() / termgfx_audio_stream_stop() (audio_mgr.c) is reusable by the other
doors. Vendored engine change recorded in PROVENANCE.md (#14).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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