Qns abt MAD Library support for ARM environment

Hi

I have recently started using the MAD decoder. My requirement is to use the MP3 library for the ARM 32 bit processor environement. I have compiled the library with the option FPM_ARM selected (I have modified the MACRO functions for my compiler support keeping the assembly instructions the same). But the audio output was not clear at all. Then I had selected FPM_DEFAULT. With that I am able to hear a feeble (but with noise) audio.

/**** mad_f_mul ****/

#define FPM_ARM

# define SIZEOF_INT 4
# define SIZEOF_LONG 4
# define SIZEOF_LONG_LONG 8

# define MAD_F_FRACBITS 28

#define MAD_F_SCALEBITS MAD_F_FRACBITS

static mad_fixed_t mad_f_mul(mad_fixed_t x,mad_fixed_t y)
{
mad_fixed_t result;
mad_fixed64hi_t hi;
mad_fixed64lo_t lo;

_asm(-1000,"
smull %0,%1,%3,%4
movs %0,lsr(%0,%5)
adc %2,%0,lsl(%1,%6)
",
__reg_gen(__obj_modify(lo)),
__reg_gen(__obj_modify(hi)),
__reg_gen(__obj_assign(result)),
__reg_gen(x),
__reg_gen(y),
MAD_F_SCALEBITS,
(32 - MAD_F_SCALEBITS)
);

return result;
}

/****Ends****/

I like to know if I am missing something?

Thanks

Balaji Shanmugam

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