03-14-2011
What Operating System and version are you running?
What Shell do you use?
Do you have a high-level language such as Oracle available or are you trying to do this with Shell tools and unix commands.
How big are the files?
How long is each record?
Ir you looking for characters 128-255 inclusive, or just character 255, or something else?
What are you going to do with the results? Are you going to try to change characters?
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LEARN ABOUT SUNOS
mlib_signallimit_s16s_s16s
mlib_SignalLimit(3MLIB) mediaLib Library Functions mlib_SignalLimit(3MLIB)
NAME
mlib_SignalLimit, mlib_SignalLimit_S16_S16, mlib_SignalLimit_S16S_S16S, mlib_SignalLimit_S16, mlib_SignalLimit_S16S, mlib_Signal-
Limit_F32_F32, mlib_SignalLimit_F32S_F32S, mlib_SignalLimit_F32, mlib_SignalLimit_F32S - signal hard limiting
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_SignalLimit_S16_S16(mlib_s16 *dst, const mlib_s16 *src, const mlib_s16 *low, const mlib_s16 *high, mlib_s32 n);
mlib_status mlib_SignalLimit_S16S_S16S(mlib_s16 *dst, const mlib_s16 *src, const mlib_s16 *low, const mlib_s16 *high, mlib_s32 n);
mlib_status mlib_SignalLimit_S16(mlib_s16 *srcdst, const mlib_s16 *low, const mlib_s16 *high, mlib_s32 n);
mlib_status mlib_SignalLimit_S16S(mlib_s16 *srcdst, const mlib_s16 *low, const mlib_s16 *high, mlib_s32 n);
mlib_status mlib_SignalLimit_F32_F32(mlib_f32 *dst, const mlib_f32 *src, const mlib_f32 *low, const mlib_f32 *high, mlib_s32 n);
mlib_status mlib_SignalLimit_F32S_F32S(mlib_f32 *dst, const mlib_f32 *src, const mlib_f32 *low, const mlib_f32 *high, mlib_s32 n);
mlib_status mlib_SignalLimit_F32(mlib_f32 *srcdst, const mlib_f32 *low, const mlib_f32 *high, mlib_s32 n);
mlib_status mlib_SignalLimit_F32S(mlib_f32 *srcdst, const mlib_f32 *low, const mlib_f32 *high, mlib_s32 n);
DESCRIPTION
Each of these functions performs hard limiting.
For monaural signals, the following equation is used:
dst[i] = low[0] if src[i] < low[0]
dst[i] = src[i] if low[0] <= src[i] < high[0]
dst[i] = high[0] if src[i] >= high[0]
where i = 0, 1, ..., (n - 1).
For stereo signals, the following equation is used:
dst[2*i] = low[0] if src[2*i] < low[0]
dst[2*i] = src[2*i] if low[0] <= src[2*i] < high[0]
dst[2*i] = high[0] if src[2*i] >= high[0]
dst[2*i+1] = low[1] if src[2*i+1] < low[1]
dst[2*i+1] = src[2*i+1] if low[1] <= src[2*i+1] < high[1]
dst[2*i+1] = high[1] if src[2*i+1] >= high[1]
where i = 0, 1, ..., (n - 1).
PARAMETERS
Each of the functions takes some of the following arguments:
dst Destination signal array.
src Source signal array.
srcdst Source and destination signal array.
low Lower input limit. In the stereo version, low[0] contains the lower limit for channel 0, and low[1] contains the lower
limit for channel 1.
high Upper input limit. In the stereo version. high[0] contains the upper limit for channel 0, and high[1] contains the upper
limit for channel 1.
n Number of samples in the source 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 |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
attributes(5)
SunOS 5.10 10 Nov 2004 mlib_SignalLimit(3MLIB)