diff options
| -rw-r--r-- | libavcodec/celp_filters.c | 10 | ||||
| -rw-r--r-- | libavcodec/celp_filters.h | 15 |
2 files changed, 25 insertions, 0 deletions
diff --git a/libavcodec/celp_filters.c b/libavcodec/celp_filters.c index cd475533a5..d54e2fa709 100644 --- a/libavcodec/celp_filters.c +++ b/libavcodec/celp_filters.c @@ -47,6 +47,16 @@ void ff_celp_convolve_circ(int16_t* fc_out, } } +void ff_celp_circ_addf(float *out, const float *in, + const float *lagged, int lag, float fac, int n) +{ + int k; + for (k = 0; k < lag; k++) + out[k] = in[k] + fac * lagged[n + k - lag]; + for (; k < n; k++) + out[k] = in[k] + fac * lagged[ k - lag]; +} + int ff_celp_lp_synthesis_filter(int16_t *out, const int16_t* filter_coeffs, const int16_t* in, diff --git a/libavcodec/celp_filters.h b/libavcodec/celp_filters.h index ccdffe8483..d9db95d454 100644 --- a/libavcodec/celp_filters.h +++ b/libavcodec/celp_filters.h @@ -42,6 +42,21 @@ void ff_celp_convolve_circ(int16_t* fc_out, int len); /** + * Add an array to a rotated array. + * + * out[k] = in[k] + fac * lagged[k-lag] with wrap-around + * + * @param out result vector + * @param in samples to be added unfiltered + * @param lagged samples to be rotated, multiplied and added + * @param lag lagged vector delay in the range [0, n] + * @param fac scalefactor for lagged samples + * @param n number of samples + */ +void ff_celp_circ_addf(float *out, const float *in, + const float *lagged, int lag, float fac, int n); + +/** * LP synthesis filter. * @param out [out] pointer to output buffer * @param filter_coeffs filter coefficients (-0x8000 <= (3.12) < 0x8000) |