On hardware InitMono only takes the mono Atrac3 parameters (0x0E, 0x0F),
and the stereo ones fail with 0x807f00ff. Init fills in the context: 44100
at 0x2c, the frame size at 0x30, and the output channels at 0x34, which
InitMono sets to 1. The ME reads that at every decode, and writes a mono
layout as stereo only when it's 2. We accepted every parameter, wrote
nothing there, and always wrote stereo.
A bad frame's ctx.err is 0x183 when a joint stereo frame's second part
lacks its marker, and 0x182 for any other bad sound unit. The decoder now
reports which, and we give 0x183 where we gave 0x182
(pspautotests audio/audiocodec/at3errors).
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Checked against pspautotests audio/audiocodec, recorded on a PSP.
- Atrac3+: at3Related selects headered (mpeg.prx) or raw (libatrac3plus)
frames, instead of sniffing for the sync word. The header's size field
is 10 bits, as the context's. Header errors 0x211/0x213, bad frames
0x20a, all returning SCE_AVCODEC_ERROR_INVALID_DATA with nothing read.
- The first successfully decoded Atrac3+ frame, and the first two AAC
frames, produce no output. Checked sample-for-sample against hardware.
- Atrac3: the parameter at 0x28 selects the frame layout, as
libatrac3plus.prx's table maps it. We used to read its low bit as a
joint-stereo flag, which decoded mono (0x0F) streams as stereo garbage.
AtracCtx2 had the table's fields swapped the same way.
- at3_standalone's Atrac3 output was inverted relative to the PSP's
(sceAtrac too). Negate the IMDCT scale.
- CheckNeedMem sizes (AAC is 0x658c), codec 0x1004/0x1005, Init
validation (AAC sample rate, Atrac3 parameter, Atrac3+ channels), and
ReleaseEDRAM clearing edramAddr.
- Every call that reaches the ME now blocks for its measured time, and
decode time is modelled per codec and frame size.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Also remove redundant parameters.
There are a bunch of other places where we could use this, so just
experimenting here.
This enables autovectorization to work here.
