mirror of https://github.com/AxioDL/metaforce.git
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
|
#ifndef _g721_h
|
||
|
|
#define _g721_h
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
struct g72x_state {
|
||
|
|
long yl; /* Locked or steady state step size multiplier. */
|
||
|
|
short yu; /* Unlocked or non-steady state step size multiplier. */
|
||
|
|
short dms; /* Short term energy estimate. */
|
||
|
|
short dml; /* Long term energy estimate. */
|
||
|
|
short ap; /* Linear weighting coefficient of 'yl' and 'yu'. */
|
||
|
|
|
||
|
|
short a[2]; /* Coefficients of pole portion of prediction filter. */
|
||
|
|
short b[6]; /* Coefficients of zero portion of prediction filter. */
|
||
|
|
short pk[2]; /*
|
||
|
|
* Signs of previous two samples of a partially
|
||
|
|
* reconstructed signal.
|
||
|
|
*/
|
||
|
|
short dq[6]; /*
|
||
|
|
* Previous 6 samples of the quantized difference
|
||
|
|
* signal represented in an internal floating point
|
||
|
|
* format.
|
||
|
|
*/
|
||
|
|
short sr[2]; /*
|
||
|
|
* Previous 2 samples of the quantized difference
|
||
|
|
* signal represented in an internal floating point
|
||
|
|
* format.
|
||
|
|
*/
|
||
|
|
char td; /* delayed tone detect, new in 1988 version */
|
||
|
|
};
|
||
|
|
|
||
|
|
void
|
||
|
|
g72x_init_state(struct g72x_state *state_ptr);
|
||
|
|
|
||
|
|
int
|
||
|
|
g721_decoder(int i,
|
||
|
|
struct g72x_state *state_ptr);
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|