feat: optional stereo->5.1 surround upmix - #2
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Config-gated upmix (upmix=off|surround, or --upmix). For <=2ch input with upmix=surround, SpdifEncoder runs an FFmpeg `surround` libavfilter graph (abuffer -> surround -> aformat -> abuffersink), buffers output in an AVAudioFifo, and primes with silence to cover FFT latency so the realtime consumer never starves. Multichannel input still downmixes via swr. Links avfilter. A free, license-clean DTS Neo:PC / Pro Logic II-style matrix upmix alternative. - unit test: stereo + upmix=surround yields AC3/IEC61937 bursts. - config key `upmix`; README/CLAUDE/default.conf documented. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Adds config-gated
upmix=surroundusing FFmpeg'ssurroundfilter to upmix stereo to 5.1 (free DTS Neo:PC-style alternative). Multichannel input still downmixes. New unit test + docs. Default off.