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TODO:
- directsound: incomplete and somewhat broken
- osx: understand why AudioQueueGetCurrentTime can return negative mSampleTime
- test (and fix) sub-prefill size data playback
- report stream delay instead of position; leave position calculation to user
- capture support
- capture and output enumeration and configuration
- also expose default hardware config to allow decisions on speaker layout
- prefill occurs at different times in each backend:
- pulse prefills async off worker thread after init
- coreaudio prefills during init
- alsa prefills async after start
- expose configured prefill size; may differ from requested latency
- solved by exposing stream delay
- xruns may occur in user callback but also in audio hardware
may need to expose details of hardware xruns to user api
- document thread safety
- document which calls may block, and when effects take effect
- document what's permissible inside callbacks
- implement basic channel mapping for surround
- vorbis has documented mapping based on channel count (if mapping type ==
0) -- http://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9
1 -> M
2 -> L, R
3 -> L, C, R
4 -> L, R, RL, RR
5 -> L, C, R, RL, RR
6 -> L, C, R, RL, RR, LFE
7 -> L, C, R, SL, SR, RC, LFE
8 -> L, C, R, SL, SR, RL, RR, LFE
>8 -> application defined
- wave files with channel count only
3 -> L, R, C
4 -> L, R, RL, RR
5 -> L, R, C, RL, RR
6 -> L, R, C, LFE, RL, RR
7 -> L, R, C, LFE, RC, SL, SR
8 -> L, R, C, LFE, RL, RR, SL, SR
- wave files with WAVE_FORMAT_EXTENSIBLE have explicitly mappings, can
extract these
- implement configurable channel mapping
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