Dumb Sequence Replacement PoC

seqReplace.c

// This was obtained by unzipping an MMRS file and copying the hex contents from the .seq file
// From the few I looked at, they all seem to start with 0xd3, 0x20, 0xd5, and end with 0xFF
unsigned char seq[] = {
	0xd3, 0x20, 0xd5, 0x32, 0xd7, 0x0a, 0x93, 0x90, 
	0x00, 0x4d, 0x91, 0x00, 0x5a, 0x94, 0x00, 0x67, 
	0x97, 0x00, 0x77, 0x99, 0x00, 0x87, 0x9b, 0x00, 
	0x94, 0xdb, 0x58, 0xdd, 0x6b, 0xfd, 0x83, 0x78, 
	0xdd, 0x6a, 0xfd, 0x18, 0xdd, 0x69, 0xfd, 0x18, 
	0xdd, 0x67, 0xfd, 0x18, 0xdd, 0x66, 0xfd, 0x18, 
	0xdd, 0x64, 0xfd, 0x18, 0xdd, 0x61, 0xfd, 0x18, 
	0xdd, 0x5e, 0xfd, 0x48, 0xdd, 0x52, 0xfd, 0x18, 
	0xdd, 0x4d, 0xfd, 0x18, 0xdd, 0x48, 0xfd, 0x81, 
	0x38, 0xd6, 0x0a, 0x93, 0xff, 0xc4, 0x88, 0x00, 
	0xa4, 0xfc, 0x02, 0x86, 0xc1, 0x05, 0xfd, 0x85, 
	0xb8, 0xff, 0xc4, 0x88, 0x00, 0xe7, 0xfc, 0x02, 
	0x86, 0xc1, 0x00, 0xfd, 0x85, 0xb8, 0xff, 0xc4, 
	0x88, 0x01, 0x60, 0x89, 0x01, 0x8a, 0xfc, 0x02, 
	0x86, 0xc1, 0x0a, 0xfd, 0x85, 0xb8, 0xff, 0xc4, 
	0x88, 0x01, 0xba, 0x89, 0x01, 0xec, 0xfc, 0x02, 
	0x86, 0xc1, 0x0b, 0xfd, 0x85, 0xb8, 0xff, 0xc4, 
	0x88, 0x01, 0xfc, 0xfc, 0x02, 0x86, 0xc1, 0x7f, 
	0xfd, 0x85, 0xb8, 0xff, 0xc4, 0x88, 0x02, 0x30, 
	0x89, 0x02, 0x6c, 0xfc, 0x02, 0x86, 0xc1, 0x0c, 
	0xfd, 0x85, 0xb8, 0xff, 0xc2, 0x00, 0xc0, 0x81, 
	0x80, 0xfc, 0x02, 0x8d, 0x30, 0x48, 0x60, 0x03, 
	0xfc, 0x02, 0x8d, 0x30, 0x18, 0x60, 0x0a, 0x35, 
	0x60, 0x60, 0x02, 0xb0, 0x60, 0x02, 0x2c, 0x18, 
	0x50, 0x0a, 0xab, 0x50, 0x0a, 0x2c, 0x48, 0x50, 
	0x03, 0x25, 0x18, 0x50, 0x0a, 0xab, 0x50, 0x0a, 
	0xac, 0x50, 0x0a, 0xae, 0x50, 0x0a, 0xac, 0x50, 
	0x0a, 0x2e, 0x60, 0x50, 0x02, 0x33, 0x30, 0x50, 
	0x05, 0x35, 0x81, 0x38, 0x50, 0x14, 0xff, 0xc2, 
	0x00, 0x35, 0x18, 0x60, 0x0a, 0xb8, 0x60, 0x0a, 
	0x3c, 0x48, 0x60, 0x03, 0x35, 0x18, 0x60, 0x0a, 
	0xb8, 0x60, 0x0a, 0xbc, 0x60, 0x0a, 0xc2, 0x0c, 
	0x35, 0x60, 0x60, 0x02, 0x30, 0x81, 0xb0, 0x60, 
	0xe4, 0x18, 0x18, 0x50, 0x0a, 0x9d, 0x50, 0x0a, 
	0xfc, 0x02, 0x95, 0x1d, 0x18, 0x50, 0x0a, 0x99, 
	0x50, 0x0a, 0xfc, 0x02, 0x95, 0x1d, 0x18, 0x50, 
	0x0a, 0x98, 0x50, 0x0a, 0xa2, 0x50, 0x0a, 0xfc, 
	0x02, 0x95, 0x1b, 0x18, 0x50, 0x0a, 0xa2, 0x50, 
	0x0a, 0xfc, 0x02, 0x95, 0x20, 0x18, 0x50, 0x0a, 
	0x99, 0x50, 0x0a, 0x98, 0x50, 0x0a, 0x99, 0x50, 
	0x0a, 0x9b, 0x50, 0x0a, 0x9d, 0x50, 0x0a, 0x9f, 
	0x50, 0x0a, 0xa2, 0x50, 0x0a, 0xa4, 0x50, 0x0a, 
	0xa7, 0x50, 0x0a, 0xa9, 0x50, 0x0a, 0xae, 0x50, 
	0x0a, 0xb0, 0x50, 0x0a, 0xb5, 0x50, 0x0a, 0xff, 
	0xc2, 0x00, 0x2c, 0x30, 0x50, 0x85, 0xae, 0x50, 
	0x85, 0x2c, 0x60, 0x50, 0xc2, 0x35, 0x80, 0xc0, 
	0x50, 0x81, 0xf8, 0x02, 0x30, 0x60, 0x50, 0xc2, 
	0xf7, 0x35, 0x80, 0xc0, 0x50, 0x81, 0xb1, 0x50, 
	0x01, 0xb3, 0x50, 0x01, 0x35, 0x81, 0x38, 0x50, 
	0x14, 0xff, 0xc2, 0x00, 0x30, 0x60, 0x50, 0xc2, 
	0x30, 0x80, 0xc0, 0x50, 0xe1, 0x30, 0x60, 0x50, 
	0x82, 0x2c, 0x30, 0x50, 0x85, 0xae, 0x50, 0x85, 
	0x2c, 0x80, 0xc0, 0x50, 0xe1, 0x30, 0x30, 0x50, 
	0x05, 0xae, 0x50, 0x05, 0x2c, 0x80, 0xc0, 0x50, 
	0x01, 0xae, 0x50, 0x01, 0x2c, 0x81, 0x38, 0x50, 
	0x14, 0xff, 0xc2, 0x00, 0x1d, 0x30, 0x50, 0x85, 
	0xa2, 0x50, 0x85, 0x1d, 0x60, 0x50, 0xc2, 0xa9, 
	0x50, 0x02, 0xa4, 0x50, 0x82, 0x1d, 0x30, 0x50, 
	0x85, 0x9f, 0x50, 0x85, 0x1d, 0x60, 0x50, 0xc2, 
	0xa4, 0x50, 0x02, 0xa2, 0x50, 0x02, 0x19, 0x80, 
	0xc0, 0x50, 0x01, 0x9b, 0x50, 0x01, 0x19, 0x81, 
	0x38, 0x50, 0x14, 0xff, 0xc2, 0x00, 0xc0, 0x81, 
	0x80, 0x20, 0x60, 0x50, 0xc2, 0x60, 0x17, 0x50, 
	0xc0, 0x83, 0xc1, 0xff, 0xc2, 0x00, 0xf8, 0x02, 
	0x14, 0x60, 0x50, 0x82, 0x14, 0x18, 0x50, 0x0a, 
	0x94, 0x50, 0x0a, 0x14, 0x30, 0x50, 0x05, 0x14, 
	0x48, 0x50, 0x03, 0x14, 0x08, 0x50, 0x20, 0x94, 
	0x50, 0x20, 0x94, 0x50, 0x20, 0x14, 0x60, 0x50, 
	0xe2, 0xf7, 0xf8, 0x02, 0x14, 0x80, 0xc0, 0x50, 
	0x01, 0xf7, 0x14, 0x81, 0x38, 0x50, 0x63, 0xff, 
	0xc2, 0x00, 0x2c, 0x30, 0x60, 0x05, 0xfc, 0x02, 
	0x9d, 0xfc, 0x02, 0x8d, 0xfc, 0x02, 0x9d, 0x2e, 
	0x60, 0x60, 0x02, 0x2c, 0x30, 0x60, 0x05, 0xfc, 
	0x02, 0x9d, 0xfc, 0x02, 0x8d, 0xfc, 0x02, 0x9d, 
	0x2e, 0x30, 0x60, 0x05, 0xb0, 0x60, 0x05, 0xb1, 
	0x60, 0x05, 0x30, 0x18, 0x60, 0x0a, 0x2c, 0x78, 
	0x60, 0x35, 0x2e, 0x48, 0x60, 0x58, 0x2e, 0x81, 
	0xb0, 0x60, 0xc7, 0xff, 0xc2, 0x00, 0xc0, 0x82, 
	0xd0, 0x33, 0x78, 0x60, 0x9b, 0xb1, 0x60, 0x35, 
	0x33, 0x30, 0x60, 0x05, 0x31, 0x18, 0x60, 0x0a, 
	0x33, 0x81, 0xb0, 0x60, 0xc7, 0xff, 0xdf, 0x64, 
	0xdd, 0x40, 0xd4, 0x00, 0xff, 0x29, 0x18, 0x60, 
	0x0a, 0xac, 0x60, 0x0a, 0xff, 0x20, 0x18, 0x50, 
	0x0a, 0x9f, 0x50, 0x0a, 0xff, 0x2b, 0x30, 0x60, 
	0x05, 0xac, 0x60, 0x05, 0xff, 
};

static uintptr_t sDevAddr = 0;
static u8* sRamAddr = NULL;
static size_t sSize = 0;
static s32 sMedium = 0;

RECOMP_HOOK("AudioLoad_SyncDma")
void* on_AudioLoad_SyncDma(uintptr_t devAddr, u8* ramAddr, size_t size, s32 medium) {
    recomp_printf("AudioLoad_SyncDma called: devAddr=%p, ramAddr=%p, size=%d, medium=%d\n", 
                  (void*)devAddr, ramAddr, size, medium);
    sDevAddr = devAddr;
    sRamAddr = ramAddr;
    sSize = size;
    sMedium = medium;
}

RECOMP_HOOK_RETURN("AudioLoad_SyncDma")
void on_AudioLoad_SyncDma_Return() {
    recomp_printf("AudioLoad_SyncDma_Return called: devAddr=%p, ramAddr=%p, size=%d, medium=%d\n", 
                  (void*)sDevAddr, sRamAddr, sSize, sMedium);

    // Replace file select sequence with custom seq above
    if (sDevAddr == 0x62d80) { // File select sequence
        Lib_MemSet(sRamAddr, 0, sSize);
        Lib_MemCpy(sRamAddr, seq, sizeof(seq));
    }

    // Replace dog bark with rupee fall SFX
    if (sDevAddr == 0x46af0) { // Sequence_0 (SFX)
	// These offsets are obtained from the tables mm-decomp/include/tables/sfx: CHAN_3D0D & CHAN_3D19
        u32 dogBarkSfx = 0x3D0D;
        u32 rupeeFallSfx = 0x3D19;

        Lib_MemCpy(sRamAddr + dogBarkSfx, sRamAddr + rupeeFallSfx, rupeeFallSfx - dogBarkSfx);
    }
}