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author | Kenan Gillet <kenan.gillet@gmail.com> | 2008-10-30 21:05:37 +0000 |
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committer | Vitor Sessak <vitor1001@gmail.com> | 2008-10-30 21:05:37 +0000 |
commit | 1fb0d4b8a65bc0b631ea2afdb2e0b80800efe82f (patch) | |
tree | f410411f82baecd89c63e189ae3ecd111a6d7295 /libavcodec/celp_filters.h | |
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.h')
-rw-r--r-- | libavcodec/celp_filters.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/libavcodec/celp_filters.h b/libavcodec/celp_filters.h index cb73aa8869..f46dcd2d2a 100644 --- a/libavcodec/celp_filters.h +++ b/libavcodec/celp_filters.h @@ -69,4 +69,28 @@ int ff_celp_lp_synthesis_filter( int stop_on_overflow, int rounder); +/** + * LP synthesis filter. + * @param out [out] pointer to output buffer + * - the array out[-filter_length, -1] must + * contain the previous result of this filter + * @param filter_coeffs filter coefficients. + * @param in input signal + * @param buffer_length amount of data to process + * @param filter_length filter length (10 for 10th order LP filter) + * + * @return 1 if overflow occurred, 0 - otherwise + * + * @note Output buffer must contain 10 samples of past + * speech data before pointer. + * + * Routine applies 1/A(z) filter to given speech data. + */ +void ff_celp_lp_synthesis_filterf( + float *out, + const float* filter_coeffs, + const float* in, + int buffer_length, + int filter_length); + #endif /* AVCODEC_CELP_FILTERS_H */ |