On Windows, nanosleep and this_thread::sleep_for/sleep_until go
through winpthreads, which ends a wait on a 15.6 ms GetTickCount64
step. Blocking sceAudioOutOutput and sceAudioOut2ContextPush calls
returned in bursts about every 16 ms, a blocking sceAudio3dPortPush
ran at about 68 % of real time, and sceAudioInInput without a device
woke anywhere from 1 ms to 31 ms apart. They now sleep with
PreciseSleepUs or the new PreciseSleepUntil.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Address review: read a grain's buffers at the next push without spinning
under the context lock, keep the no-device model mixing at push time,
size the pad queue from the unplayed main grains again, use generic
names in comments and TechnicalDebt, and add audio_out2_timing (next-push
read, queue level beyond the cushion, priming after running dry).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A push mixed the ports' buffers at once and queued the mix on SDL, and
the queue level left out a 40 ms cushion that the SDL queue rarely
exceeded, so titles saw an empty queue. PPSA12544's FMOD output fills a
256-frame buffer after pushing it, reuses it two pushes later, and its
mixer thread can still be writing a buffer when the next push follows
within microseconds: a grain boundary broke about every 5 ms (an audible
crackle).
A push now records the buffers the ports point at and reads the previous
grain at the next push, 100 us after it. The mixed frames are played by
the SDL device callback, which waits for a 40 ms cushion before it plays
(again after running dry), and the queue level counts the unplayed
grains beyond that cushion. Recording the four buffers at every push
showed 27% of boundaries broken when read at the push, 59% when read two
pushes later and none when read at the next push; the title's output
went from 4-9% to none of its grain boundaries broken over 6,000 loud
grains.
AI-assisted: yes
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A title can open AudioOut2 ports of type 0x3 (the controller's speaker)
and 0x6 (its two voice-coil actuators) next to its bed and object ports.
Both were folded into the TV mix, so the haptics came out of the PC
speakers as low thumps and the controller got nothing.
A USB DualSense is also a 4-channel 48 kHz sound card: channels 1-2 feed
the speaker and headset jack, channels 3-4 the left and right actuators.
When SDL lists such a card, a context with these ports opens it and
queues a grain on it with every push: the speaker port on channels 1-2
(a mono port duplicated) and the vibration port's left and right
channels on 3-4, at the port volumes and clamped. Both ports then leave
the main mix. The card's queue gets the main queue's silence cushion when
it runs dry and drops grains that run more than two grains beyond the
main queue, so the controller keeps pace with the TV. An unplugged card
is released (its ports return to the main mix) and looked for again
every 2 s. Without a card nothing changes, and other port types and
channel counts keep their routing.
SDL2's PulseAudio backend labels a 4-channel stream FL FR FC LFE instead
of quad, and the sound server then folds channels 3-4 into the speaker.
Under that backend the card is opened as 5.1 with FC and LFE silent and
the actuators on the back pair, which lands on the card's RL/RR.
- AudioOut2: one SDL device per context; the hardware grain queue level
is derived from the SDL queued bytes so the title's poll-and-push loop
runs at real time; ports are mixed per push with 7.1 folded to stereo.
- libSceAjm.native: instance and batch APIs; ATRAC9 decoding with
variable-size frames inside superframes, padding, gapless parameters
and handle re-creation on re-initialisation.
- AudioOut v1: sceAudioOutOutput(handle, NULL) drains instead of
throwing.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0177gthrWEBBfBu5xJDXgBfo
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