Replaces the ansnd-based backend (a third-party library with a custom
DSP ucode Dolphin's HLE audio emulation doesn't recognize, requiring
-a LLE as a workaround) with libogc's own asndlib - the standard,
HLE-supported audio API most GC/Wii homebrew already uses.
Also fixes three real bugs found while getting a large (41MB) WAV
asset actually playing on Dolphin:
- audiostreamdolphin.c previously buffered a stream's entire loop
segment into one allocation up front (inherited from the ansnd
design) - fine for a short test tone, but an out-of-memory crash for
a real multi-minute track on GameCube's 24MB (or even Wii's 88MB)
total RAM. Rewritten to stream bounded windows via ASND's real
double-buffer primitives (ASND_SetVoice + ASND_AddVoice, polled from
the main thread - never from an interrupt callback), matching how
Linux/PSP already work.
- ASND_TestVoiceBufferReady() returns SND_OK (0) when ready and
SND_BUSY (1) when not, in the actual toolchain fork
(extremscorner/libogc2) this project builds against - opposite of a
plain boolean. Treating the raw result as one meant a genuinely
ready voice's SND_OK read as false, silently skipping every
ASND_AddVoice() call forever after a stream's first buffered window.
- audioStreamPcmRead()'s 16-bit fast path read WAV's little-endian
sample bytes straight into the output buffer with no byte-swap -
correct by coincidence on every little-endian platform this engine
targets (Linux, PSP), but reversed every sample's bytes on
Dolphin/GameCube/Wii's big-endian PowerPC.
libmad is GPL-licensed (see audiostreammp3decodersw.h's own note from
the prior MP3 change); libogc's asndlib is under a permissive
BSD-style license, so this doesn't add another such dependency.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
YourWishesandClaude Sonnet 5
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