New ASSET_LOADER_TYPE_MP3 (hand-rolled MPEG-1/2/2.5 Layer III header
parser - no third-party dependency needed just for metadata, since PSP's
hardware path doesn't need one at all) plus a shared audiostreammp3.c
stream layer mirroring audiostreampcm.c's shape. Generalized the stream
dispatch (hoisted sampleRate/channels onto audiostream_t, added
audioStreamGetTotalFrames()/Seek()/Read()) so all three platform audio
backends keep working unchanged, just calling the generic names instead
of PCM-specific ones.
Two decoder backends behind one interface: PSP uses the real sceMp3
hardware decoder (firmware-offloaded, lazily initialized on first use);
Linux and Dolphin share one minimp3-based software decoder (public
domain, vendored via CMake FetchContent) - libogc's own MP3Player wraps
libmad (GPL) and drives its own output pipeline, not a fit for the
ansnd-based architecture already in place, so skipped in favor of the
shared minimp3 path.
Fixed three real bugs found via hardware/runtime testing along the way:
- LAME's Xing header counts its own placeholder frame in the declared
total, which made playback stall permanently one frame short of the
declared end (looked like "never loops") - fixed by subtracting it.
- sceMp3Decode() can return more PCM than one MPEG frame's worth in a
single call (PSP's pcmBuf is provisioned for 2x), overflowing the
shared per-frame decode buffer with no bound check - very intermittent
corruption/clicking on real hardware. Widened the buffer to the real
worst case and added an assertion.
- sceMp3ResetPlayPosition()'s exact internal reset semantics aren't
documented precisely enough to trust for looping - occasionally
disagreed with the fresh stream position fed right after, clicking at
the loop boundary about 1 in 3-4 loops. Rewind now fully tears down and
recreates the decoder instead, the same path already proven correct at
first Init. Also widened the PSP ring buffer to absorb that now-heavier
operation, capping each top-up call's own work so the bigger buffer
doesn't turn into one long blocking decode burst instead.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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