diff options
author | Colin McQuillan <m.niloc@googlemail.com> | 2009-08-12 23:54:28 +0400 |
---|---|---|
committer | Robert Swain <robert.swain@gmail.com> | 2009-08-12 23:54:28 +0400 |
commit | d4d6ae16033097462c8336868eb4acfa617acd6c (patch) | |
tree | 48060d235aebc1afe921c636182b6aafe1deb2aa /libavcodec/celp_filters.c | |
parent | 51fdb6f08d3e18d052f2be630ad7ec160d4247ec (diff) |
Add ff_celp_circ_addf() function to be used for sparse vector circular
convolution in the upcoming AMR-NB floating point decoder. The function scales
and adds a vector, that is lagged by some offset, to another vector with the
same number of elements.
Patch by Colin McQuillan ( m.niloc googlemail com )
Originally committed as revision 19634 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/celp_filters.c')
-rw-r--r-- | libavcodec/celp_filters.c | 10 |
1 files changed, 10 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, |