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Implement bidirectional (positive offset - left, negative - right)

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signed shift for ACELP-based codecs.

Originally committed as revision 13117 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vladimir Voroshilov 2008-05-11 11:49:25 +00:00
parent 0a1b29dea7
commit ce9eac7913
1 changed files with 13 additions and 0 deletions
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13
libavcodec/acelp_math.h
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@ -72,4 +72,17 @@ static int sum_of_squares(const int16_t* speech, int length, int offset, int shi
return sum; return sum;
} }
/**
* \brief Shift value left or right depending on sign of offset parameter.
* \param value value to shift
* \param offset shift offset
*
* \return value << offset, if offset>=0; value >> -offset - otherwise
*/
static inline int bidir_sal(int value, int offset)
{
if(offset < 0) return value >> -offset;
else return value << offset;
}
#endif /* FFMPEG_ACELP_MATH_H */ #endif /* FFMPEG_ACELP_MATH_H */