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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
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@ -47,6 +47,16 @@ void ff_celp_convolve_circ(int16_t* fc_out,
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}
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}
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void ff_celp_circ_addf(float *out, const float *in,
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const float *lagged, int lag, float fac, int n)
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{
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int k;
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for (k = 0; k < lag; k++)
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out[k] = in[k] + fac * lagged[n + k - lag];
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for (; k < n; k++)
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out[k] = in[k] + fac * lagged[ k - lag];
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}
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int ff_celp_lp_synthesis_filter(int16_t *out,
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const int16_t* filter_coeffs,
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const int16_t* in,
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@ -41,6 +41,21 @@ void ff_celp_convolve_circ(int16_t* fc_out,
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const int16_t* filter,
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int len);
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/**
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* Add an array to a rotated array.
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*
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* out[k] = in[k] + fac * lagged[k-lag] with wrap-around
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*
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* @param out result vector
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* @param in samples to be added unfiltered
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* @param lagged samples to be rotated, multiplied and added
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* @param lag lagged vector delay in the range [0, n]
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* @param fac scalefactor for lagged samples
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* @param n number of samples
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*/
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void ff_celp_circ_addf(float *out, const float *in,
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const float *lagged, int lag, float fac, int n);
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/**
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* LP synthesis filter.
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* @param out [out] pointer to output buffer
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