* #27232: jni: added pjproject checkout as regular git content
We will remove it once the next release of pjsip (with Android support)
comes out and is merged into SFLphone.
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+README file for resample-1.x.tgz from the
+Digital Audio Resampling Home Page located at
+http://ccrma.stanford.edu/~jos/resample/.
+
+SOFTWARE FOR SAMPLING-RATE CONVERSION AND FIR DIGITAL FILTER DESIGN
+
+For installation instructions, read the INSTALL file in this directory.
+
+The resample program "resamples" a soundfile to change its sampling
+rate. For example, it can be used to convert the sampling rate from
+48 kHz (used by DAT machines) to 44.1 kHz (the standard sampling rate
+for Compact Discs). The command line for this operation would look
+something like
+
+ resample -by 0.91875 dat.snd cd.snd
+
+or, more simply,
+
+ resample -to 44100 dat.snd cd.snd
+
+Any reasonable sampling rate can be converted to any other.
+
+The windowfilter program designs Finite-Impulse-Response (FIR) digital
+filters by the so-called "window method." In this method, the ideal
+impulse response (a sinc function) is "windowed" by a Kaiser window (a
+popular window used in spectrum analysis).
+
+The resample program uses 32-bit fixed-point arithmetic: 16-bits data
+and 16-bits coefficients. The input soundfile must be 16-bit mono or
+stereo (interleaved) audio data.
+
+SNDLIB
+
+The program uses elements of Bill Schottstaedt's sndlib sound file
+library. This means resample can read many different kinds of sound
+file header (AIFF, WAV, NeXT, IRCAM, etc.).
+
+The sndlib files used by resample are included in this directory to
+ensure stability. The latest version of sndlib should be available as
+
+ ftp://ccrma-ftp.stanford.edu/pub/Lisp/sndlib.tar.gz
+
+See sndlib.html in the sndlib distribution for documentation of SNDLIB.
+
+CONTENTS of ./src directory
+
+resample.c Sampling-rate conversion program.
+resample.1 Manual page for resample. Try "nroff -man resample.1".
+resamplesubs.c Subroutines used by resample.
+resample.h Configuration constants for the sampling rate converter.
+stdefs.h Machine-dependent definitions, useful constants and macros.
+
+windowfilter.c Program for designing FIR digital filters used by resample.
+windowfilter.1 Manual page for windowfilter.
+filterkit.c Library for filter design, application, and file management.
+filterkit.h Declarations (procedure prototypes) for the filterkit library.
+
+README This file.
+README.deemph A word about deemphasis filtering.
+LGPL GNU Lesser General Public License (LGPL)
+
+SNDLIB files:
+ io.c
+ audio.c
+ headers.c
+ sound.c
+ sndlib.h
+ sndlib-strings.h
+
+COPYING
+
+SNDLIB files are Copyright 2000 by Bill Schottstaedt <bil@ccrma.stanford.edu>.
+
+The remaining files in this package, unless otherwise noted, are
+Copyright 1994-2006 by Julius O. Smith III <jos@ccrma.stanford.edu>,
+all rights reserved. Permission to use and copy is granted subject to
+the terms of the "GNU Lesser General Public License" (LGPL) as
+published by the Free Software Foundation; either version 2.1 of the
+License, or any later version. In addition, we request that a copy of
+any modified files be sent by email to jos@ccrma.stanford.edu so that
+we may incorporate them into the CCRMA version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+FILTERKIT CONTENTS
+
+ LpFilter() - Calculates the filter coeffs for a Kaiser-windowed
+ low-pass filter with a given roll-off frequency. These
+ coeffs are stored into a array of doubles.
+
+ writeFilter() - Writes a filter to a file.
+
+ makeFilter() - A section of the original SAIL program. Calls
+ LpFilter() to create a filter, then scales the double
+ coeffs into a array of half words.
+
+ readFilter() - Reads a filter from a file.
+
+ FilterUp() - Applies a filter to a given sample when up-converting.
+
+ FilterUD() - Applies a filter to a given sample when up- or down-
+ converting. Both are repoductions of the original SAIL
+ program.
+
+ initZerox() - Initialization routine for the zerox() function. Must
+ be called before zerox() is called. This routine loads
+ the correct filter so zerox() can use it.
+
+ zerox() - Given a pointer into a sample, finds a zero-crossing on the
+ interval [pointer-1:pointer+2] by iteration.
+
+ Query() - Ask the user for a yes/no question with prompt, default,
+ and optional help.
+
+ GetUShort() - Ask the user for a unsigned short with prompt, default,
+ and optional help.
+
+ GetDouble() - Ask the user for a double with prompt, default, and
+ optional help.
+
+ GetString() - Ask the user for a string with prompt, default, and
+ optional help.
+
+
+FILTER FILE FORMAT
+
+ File Name: "F" Nmult "T" Nhc ".filter"
+ example: "F13T8.filter" and "F27T8.filter"
+
+ Structure of File:
+ "ScaleFactor" LpScl
+ "Length" Nwing
+ "Coeffs:"
+ Imp[0]
+ Imp[1]
+ :
+ Imp[Nwing-1]
+ "Differences:"
+ ImpD[0]
+ ImpD[1]
+ :
+ ImpD[Nwing-1]
+ EOF
+
+ where: Something enclosed in "" indicates specific characters in the file.
+ Nmult, Nwing, Imp[], and ImpD[] are variables (HWORD)
+ Npc is a conversion constant.
+ EOF is the end of the file.
+
+ See writeFilter() and readFilter() in "filterkit.c" for more details.
+