mirror of https://git.ffmpeg.org/ffmpeg.git
Rename pred() to eval_lpc_coeffs() and add a doxy comment
Originally committed as revision 14361 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
parent
a0cce1587b
commit
a3896c6377
|
@ -97,7 +97,13 @@ static void colmult(float *tgt, const float *m1, const float *m2, int n)
|
||||||
*(tgt++) = (*(m1++)) * (*(m2++));
|
*(tgt++) = (*(m1++)) * (*(m2++));
|
||||||
}
|
}
|
||||||
|
|
||||||
static int pred(const float *in, float *tgt, int n)
|
/**
|
||||||
|
* Converts autocorrelation coefficients to LPC coefficients using the
|
||||||
|
* Levinson-Durbin algorithm. See blocks 37 and 50 of the G.728 specification.
|
||||||
|
*
|
||||||
|
* @return 1 if success, 0 if fail
|
||||||
|
*/
|
||||||
|
static int eval_lpc_coeffs(const float *in, float *tgt, int n)
|
||||||
{
|
{
|
||||||
int x, y;
|
int x, y;
|
||||||
double f0, f1, f2;
|
double f0, f1, f2;
|
||||||
|
@ -189,7 +195,7 @@ static void update(Real288_internal *glob)
|
||||||
do_hybrid_window(36, 40, 35, buffer1, temp1, glob->st1a, glob->st1b,
|
do_hybrid_window(36, 40, 35, buffer1, temp1, glob->st1a, glob->st1b,
|
||||||
syn_window);
|
syn_window);
|
||||||
|
|
||||||
if (pred(temp1, glob->st1, 36))
|
if (eval_lpc_coeffs(temp1, glob->st1, 36))
|
||||||
colmult(glob->pr1, glob->st1, table1a, 36);
|
colmult(glob->pr1, glob->st1, table1a, 36);
|
||||||
|
|
||||||
memcpy(buffer2 , glob->history + 4, 4*sizeof(*buffer2));
|
memcpy(buffer2 , glob->history + 4, 4*sizeof(*buffer2));
|
||||||
|
@ -198,7 +204,7 @@ static void update(Real288_internal *glob)
|
||||||
do_hybrid_window(10, 8, 20, buffer2, temp2, glob->st2a, glob->st2b,
|
do_hybrid_window(10, 8, 20, buffer2, temp2, glob->st2a, glob->st2b,
|
||||||
gain_window);
|
gain_window);
|
||||||
|
|
||||||
if (pred(temp2, glob->st2, 10))
|
if (eval_lpc_coeffs(temp2, glob->st2, 10))
|
||||||
colmult(glob->pr2, glob->st2, table2a, 10);
|
colmult(glob->pr2, glob->st2, table2a, 10);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
Loading…
Reference in New Issue