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author | Kenan Gillet <kenan.gillet@gmail.com> | 2008-10-31 00:05:37 +0300 |
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committer | Vitor Sessak <vitor1001@gmail.com> | 2008-10-31 00:05:37 +0300 |
commit | 1fb0d4b8a65bc0b631ea2afdb2e0b80800efe82f (patch) | |
tree | f410411f82baecd89c63e189ae3ecd111a6d7295 /libavcodec/celp_filters.c | |
parent | 0bc484ad51f5c85a3c1298a718355724905cdd6b (diff) |
Add a LPC filter
Part of the QCELP patch by Kenan Gillet, kenan.gillet gmail com
Originally committed as revision 15754 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/celp_filters.c')
-rw-r--r-- | libavcodec/celp_filters.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/libavcodec/celp_filters.c b/libavcodec/celp_filters.c index 758c9b0a90..3d983c4f75 100644 --- a/libavcodec/celp_filters.c +++ b/libavcodec/celp_filters.c @@ -84,3 +84,24 @@ int ff_celp_lp_synthesis_filter( return 0; } + +void ff_celp_lp_synthesis_filterf( + float *out, + const float* filter_coeffs, + const float* in, + int buffer_length, + int filter_length) +{ + int i,n; + + // These two lines are to avoid a -1 subtraction in the main loop + filter_length++; + filter_coeffs--; + + for(n=0; n<buffer_length; n++) + { + out[n] = in[n]; + for(i=1; i<filter_length; i++) + out[n] += filter_coeffs[i] * out[n-i]; + } +} |