Originally committed as revision 14890 to svn://svn.ffmpeg.org/ffmpeg/trunk
* @param precision filter is able to interpolate with 1/precision precision of pitch delay
* @param pitch_delay_frac pitch delay, fractional part [0..precision-1]
* @param filter_length filter length
- * @param length length of speech data to process
+ * @param length length of output
*
* filter_coeffs contains coefficients of the right half of the symmetric
* interpolation filter. filter_coeffs[0] should the central (unpaired) coefficient.