Restores the adaptive codebook vector by interpolating the past excitation.
Syntax
IppStatus ippsDecodeAdaptiveVector_G729_16s(const Ipp16s* pSrcDelay, Ipp16s* pSrcDstPrevExcitation, Ipp16s* pDstAdptVector);
IppStatus ippsDecodeAdaptiveVector_G729_16s_I(const Ipp16s* pSrcDelay, Ipp16s* pSrcDstPrevExcitation);
IppStatus ippsDecodeAdaptiveVector_G729_32f_I(const Ipp32s* pSrcDelay, Ipp32f* pSrcDstPrevExcitation);
Parameters
pSrcDelay |
Pointer to the integer and fraction delay for each subframe. |
pSrcDstPrevExcitation |
Pointer to the past and updated excitations vector [194]. |
pDstAdptVector |
Pointer to the adaptive codebook vector [40]. |
Description
The function ippsDecodeAdaptiveVector_G729 is declared in the ippsc.h file. This function restores the adaptive codebook vector by interpolating the past excitation. It performs the following steps:
1. Decodes the integer part and fractional part of the pitch delay T and t.
2. Interpolates the past excitation to get the current adaptive excitation as:
n
= 0, 1,..., 39
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error when one of the specified pointers is NULL. |
ippStsRangeErr |
Indicates an error when pSrcDelay[0] is not in the range [18, 145], or pSrcDelay[1] is not -1, 0 or 1. |