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hardcoded but justified

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briaguya 2025-05-17 18:45:30 -04:00
commit 951bf4f99e
1 changed files with 38 additions and 8 deletions
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46
soh/soh/stubs.c
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@ -145,17 +145,47 @@ void Audio_osWritebackDCache(void* mem, s32 size) {
} }
s32 osAiSetFrequency(u32 freq) { s32 osAiSetFrequency(u32 freq) {
// from libultra // this is based off the math from the original method
// #define VI_NTSC_CLOCK 48681812 /* Hz = 48.681812 MHz */ /*
// s32 osViClock = VI_NTSC_CLOCK;
f32 dacRateF = ((f32)48681812 / freq) + 0.5f;
u32 dacRate = dacRateF;
if (dacRate < 132) { s32 osAiSetFrequency(u32 frequency) {
return -1; u8 bitrate;
f32 dacRateF = ((f32)osViClock / frequency) + 0.5f;
u32 dacRate = dacRateF;
if (dacRate < 132) {
return -1;
}
bitrate = (dacRate / 66);
if (bitrate > 16) {
bitrate = 16;
}
HW_REG(AI_DACRATE_REG, u32) = dacRate - 1;
HW_REG(AI_BITRATE_REG, u32) = bitrate - 1;
return osViClock / (s32)dacRate;
} }
return 48681812 / (s32)dacRate; */
// bitrate is unused
// osViClock comes from
// #define VI_NTSC_CLOCK 48681812 /* Hz = 48.681812 MHz */
// s32 osViClock = VI_NTSC_CLOCK;
// frequency was originally 32000
// given all of that, dacRate is
// (u32)(((f32)48681812 / 32000) + 0.5f)
// which evaluates to 1521 (which is > 132)
// this leaves us with a final calculation of
// 48681812 / 1521
// which evaluates to 32006
return 32006;
} }
void osInvalDCache(void* vaddr, s32 nbytes) { void osInvalDCache(void* vaddr, s32 nbytes) {