libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.

/* adaptation between stdint types and those used by ETSI EFR code */

typedef int16_t Word16;
typedef int32_t Word32;
typedef uint8_t Flag;

/* Struct for storing pseudo floating point exponent and mantissa */
struct _fp
{
    Word16 e;          /* exponent */
    Word16 m;          /* mantissa */
};

typedef struct _fp Pfloat;