mlib_SignalDownSample_S16_S16(3MLIB)			    mediaLib Library Functions			      mlib_SignalDownSample_S16_S16(3MLIB)

NAME

       mlib_SignalDownSample_S16_S16,  mlib_SignalDownSample_S16S_S16S,  mlib_SignalDownSample_F32_F32,  mlib_SignalDownSample_F32S_F32S  - signal
       downsampling

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_SignalDownSample_S16_S16(mlib_s16 *dst,
	    const mlib_s16 *src, mlib_s32 factor, mlib_s32 phase,
	    mlib_s32 n);

       mlib_status mlib_SignalDownSample_S16S_S16S(mlib_s16 *dst,
	    const mlib_s16 *src, mlib_s32 factor, mlib_s32 phase,
	    mlib_s32 n);

       mlib_status mlib_SignalDownSample_F32_F32(mlib_f32 *dst,
	    const mlib_f32 *src, mlib_s32 factor, mlib_s32 phase,
	    mlib_s32 n);

       mlib_status mlib_SignalDownSample_F32S_F32S(mlib_f32 *dst,
	    const mlib_f32 *src, mlib_s32 factor, mlib_s32 phase,
	    mlib_s32 n);

DESCRIPTION

       Each of these functions performs downsampling.

       For monaural signals, the following equation is used:

	 dst[i] = src[i*factor + phase]

       where i = 0, 1, ..., (n - 1 - phase)/factor.

       For stereo signals, the following equation is used:

	 dst[2*i]     = src[2*(i*factor + phase)]
	 dst[2*i + 1] = src[2*(i*factor + phase) + 1]

       where i = 0, 1, ..., (n - 1 - phase)/factor.

PARAMETERS

       Each of the functions takes the following arguments:

       dst	 Output signal array.

       src	 Input signal array.

       factor	 Factor by which to downsample. factor >= 1.

       phase	 Parameter that determines relative position of an output value, within the input signal. 0 <= phase < factor.

       n	 Number of samples in the input signal array.

RETURN VALUES

       Each of the functions returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_SignalUpSample_S16_S16(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007				      mlib_SignalDownSample_S16_S16(3MLIB)