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authorBenny Prijono <bennylp@teluu.com>2007-04-07 14:53:15 +0000
committerBenny Prijono <bennylp@teluu.com>2007-04-07 14:53:15 +0000
commitca07a9833149d270d1e5b44cfa381ac6ac03e39c (patch)
tree0d1297c8326f76aec00e068795ed1505047c63a7 /third_party/resample/src
parent81d1b2797aa3945c529d57f9ddf6179ec2b392a4 (diff)
Moved resample to third_party directory
git-svn-id: http://svn.pjsip.org/repos/pjproject/branches/split-3rd-party@1170 74dad513-b988-da41-8d7b-12977e46ad98
Diffstat (limited to 'third_party/resample/src')
-rw-r--r--third_party/resample/src/Makefile.am22
-rw-r--r--third_party/resample/src/Makefile.in478
-rw-r--r--third_party/resample/src/filterkit.c631
-rw-r--r--third_party/resample/src/filterkit.h159
-rw-r--r--third_party/resample/src/largefilter.h16411
-rw-r--r--third_party/resample/src/resample.c238
-rw-r--r--third_party/resample/src/resample.h86
-rw-r--r--third_party/resample/src/resamplesubs.c520
-rw-r--r--third_party/resample/src/smallfilter.h4617
-rw-r--r--third_party/resample/src/sndlibextra.c90
-rw-r--r--third_party/resample/src/sndlibextra.h48
-rw-r--r--third_party/resample/src/stdefs.h59
-rw-r--r--third_party/resample/src/windowfilter.c114
13 files changed, 23473 insertions, 0 deletions
diff --git a/third_party/resample/src/Makefile.am b/third_party/resample/src/Makefile.am
new file mode 100644
index 00000000..bd3ce51a
--- /dev/null
+++ b/third_party/resample/src/Makefile.am
@@ -0,0 +1,22 @@
+## Process this file with automake to produce Makefile.in
+
+SNDLIB = ../sndlib-20
+
+INCLUDES = -I$(SNDLIB)
+
+bin_PROGRAMS = resample windowfilter
+
+resample_SOURCES = resample.c resamplesubs.c sndlibextra.c filterkit.c \
+ $(SNDLIB)/audio.c $(SNDLIB)/io.c $(SNDLIB)/headers.c $(SNDLIB)/sound.c \
+ resample.h stdefs.h sndlibextra.h filterkit.h smallfilter.h largefilter.h \
+ $(SNDLIB)/sndlib.h $(SNDLIB)/mus-config.h $(SNDLIB)/_sndlib.h $(SNDLIB)/sndlib-strings.h $(SNDLIB)/configure
+
+resample_LDADD = -lm
+
+windowfilter_SOURCES = windowfilter.c resamplesubs.c sndlibextra.c filterkit.c \
+ $(SNDLIB)/audio.c $(SNDLIB)/io.c $(SNDLIB)/headers.c $(SNDLIB)/sound.c
+
+windowfilter_LDADD = -lm
+
+EXTRA_DIST = $(man_MANS)
+
diff --git a/third_party/resample/src/Makefile.in b/third_party/resample/src/Makefile.in
new file mode 100644
index 00000000..56da85f2
--- /dev/null
+++ b/third_party/resample/src/Makefile.in
@@ -0,0 +1,478 @@
+# Makefile.in generated by automake 1.9.6 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005 Free Software Foundation, Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+srcdir = @srcdir@
+top_srcdir = @top_srcdir@
+VPATH = @srcdir@
+pkgdatadir = $(datadir)/@PACKAGE@
+pkglibdir = $(libdir)/@PACKAGE@
+pkgincludedir = $(includedir)/@PACKAGE@
+top_builddir = ..
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+INSTALL = @INSTALL@
+install_sh_DATA = $(install_sh) -c -m 644
+install_sh_PROGRAM = $(install_sh) -c
+install_sh_SCRIPT = $(install_sh) -c
+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+bin_PROGRAMS = resample$(EXEEXT) windowfilter$(EXEEXT)
+subdir = src
+DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in
+ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
+am__aclocal_m4_deps = $(top_srcdir)/configure.in
+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
+ $(ACLOCAL_M4)
+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/config.h
+CONFIG_CLEAN_FILES =
+am__installdirs = "$(DESTDIR)$(bindir)"
+binPROGRAMS_INSTALL = $(INSTALL_PROGRAM)
+PROGRAMS = $(bin_PROGRAMS)
+am_resample_OBJECTS = resample.$(OBJEXT) resamplesubs.$(OBJEXT) \
+ sndlibextra.$(OBJEXT) filterkit.$(OBJEXT) audio.$(OBJEXT) \
+ io.$(OBJEXT) headers.$(OBJEXT) sound.$(OBJEXT)
+resample_OBJECTS = $(am_resample_OBJECTS)
+resample_DEPENDENCIES =
+am_windowfilter_OBJECTS = windowfilter.$(OBJEXT) \
+ resamplesubs.$(OBJEXT) sndlibextra.$(OBJEXT) \
+ filterkit.$(OBJEXT) audio.$(OBJEXT) io.$(OBJEXT) \
+ headers.$(OBJEXT) sound.$(OBJEXT)
+windowfilter_OBJECTS = $(am_windowfilter_OBJECTS)
+windowfilter_DEPENDENCIES =
+DEFAULT_INCLUDES = -I. -I$(srcdir) -I$(top_builddir)
+depcomp = $(SHELL) $(top_srcdir)/depcomp
+am__depfiles_maybe = depfiles
+COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
+ $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
+CCLD = $(CC)
+LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@
+SOURCES = $(resample_SOURCES) $(windowfilter_SOURCES)
+DIST_SOURCES = $(resample_SOURCES) $(windowfilter_SOURCES)
+ETAGS = etags
+CTAGS = ctags
+DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
+ACLOCAL = @ACLOCAL@
+ALLOCA = @ALLOCA@
+AMDEP_FALSE = @AMDEP_FALSE@
+AMDEP_TRUE = @AMDEP_TRUE@
+AMTAR = @AMTAR@
+AUTOCONF = @AUTOCONF@
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+CYGPATH_W = @CYGPATH_W@
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+EGREP = @EGREP@
+EXEEXT = @EXEEXT@
+INSTALL_DATA = @INSTALL_DATA@
+INSTALL_PROGRAM = @INSTALL_PROGRAM@
+INSTALL_SCRIPT = @INSTALL_SCRIPT@
+INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
+LDFLAGS = @LDFLAGS@
+LIBOBJS = @LIBOBJS@
+LIBS = @LIBS@
+LTLIBOBJS = @LTLIBOBJS@
+MAKEINFO = @MAKEINFO@
+OBJEXT = @OBJEXT@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
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+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+SNDLIB = ../sndlib-20
+INCLUDES = -I$(SNDLIB)
+resample_SOURCES = resample.c resamplesubs.c sndlibextra.c filterkit.c \
+ $(SNDLIB)/audio.c $(SNDLIB)/io.c $(SNDLIB)/headers.c $(SNDLIB)/sound.c \
+ resample.h stdefs.h sndlibextra.h filterkit.h smallfilter.h largefilter.h \
+ $(SNDLIB)/sndlib.h $(SNDLIB)/mus-config.h $(SNDLIB)/_sndlib.h $(SNDLIB)/sndlib-strings.h $(SNDLIB)/configure
+
+resample_LDADD = -lm
+windowfilter_SOURCES = windowfilter.c resamplesubs.c sndlibextra.c filterkit.c \
+ $(SNDLIB)/audio.c $(SNDLIB)/io.c $(SNDLIB)/headers.c $(SNDLIB)/sound.c
+
+windowfilter_LDADD = -lm
+EXTRA_DIST = $(man_MANS)
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .o .obj
+$(srcdir)/Makefile.in: $(srcdir)/Makefile.am $(am__configure_deps)
+ @for dep in $?; do \
+ case '$(am__configure_deps)' in \
+ *$$dep*) \
+ cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh \
+ && exit 0; \
+ exit 1;; \
+ esac; \
+ done; \
+ echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu src/Makefile'; \
+ cd $(top_srcdir) && \
+ $(AUTOMAKE) --gnu src/Makefile
+.PRECIOUS: Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+ @case '$?' in \
+ *config.status*) \
+ cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+ *) \
+ echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
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+$(ACLOCAL_M4): $(am__aclocal_m4_deps)
+ cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+install-binPROGRAMS: $(bin_PROGRAMS)
+ @$(NORMAL_INSTALL)
+ test -z "$(bindir)" || $(mkdir_p) "$(DESTDIR)$(bindir)"
+ @list='$(bin_PROGRAMS)'; for p in $$list; do \
+ p1=`echo $$p|sed 's/$(EXEEXT)$$//'`; \
+ if test -f $$p \
+ ; then \
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+ $(INSTALL_PROGRAM_ENV) $(binPROGRAMS_INSTALL) "$$p" "$(DESTDIR)$(bindir)/$$f" || exit 1; \
+ else :; fi; \
+ done
+
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+ @$(NORMAL_UNINSTALL)
+ @list='$(bin_PROGRAMS)'; for p in $$list; do \
+ f=`echo "$$p" | sed 's,^.*/,,;s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/'`; \
+ echo " rm -f '$(DESTDIR)$(bindir)/$$f'"; \
+ rm -f "$(DESTDIR)$(bindir)/$$f"; \
+ done
+
+clean-binPROGRAMS:
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+ @rm -f resample$(EXEEXT)
+ $(LINK) $(resample_LDFLAGS) $(resample_OBJECTS) $(resample_LDADD) $(LIBS)
+windowfilter$(EXEEXT): $(windowfilter_OBJECTS) $(windowfilter_DEPENDENCIES)
+ @rm -f windowfilter$(EXEEXT)
+ $(LINK) $(windowfilter_LDFLAGS) $(windowfilter_OBJECTS) $(windowfilter_LDADD) $(LIBS)
+
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+ -rm -f *.$(OBJEXT)
+
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+
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diff --git a/third_party/resample/src/filterkit.c b/third_party/resample/src/filterkit.c
new file mode 100644
index 00000000..5171b5ea
--- /dev/null
+++ b/third_party/resample/src/filterkit.c
@@ -0,0 +1,631 @@
+/*
+ * filterkit.c (library "filterkit.a"): Kaiser-windowed low-pass filter support.
+ */
+
+/* filterkit.c
+ *
+ * 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() - Calls LpFilter() to create a filter, then scales the double
+ * coeffs into an 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.
+ * 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.
+ */
+
+#include "resample.h"
+#include "filterkit.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <math.h>
+
+/*
+ * Getstr() will print the passed "prompt" as a message to the user, and
+ * wait for the user to type an input string. The string is
+ * then copied into "answer". If the user types just a carriage
+ * return, then the string "defaultAnswer" is copied into "answer".
+ * ???
+ * "Answer" and "defaultAnswer" may be the same string, in which case,
+ * the defaultAnswer value will be the original contents of "answer".
+ * ???
+ */
+static void getstr(char *prompt, char *defaultAnswer, char *answer)
+{
+ char *p,s[200];
+
+ printf("%s (defaultAnswer = %s):",prompt,defaultAnswer);
+ strcpy(s, prompt);
+ if (!(*s))
+ strcpy(s, "input:");
+ p = s;
+ while (*p && *p != '(')
+ p++;
+ p--;
+ while (*p == ' ')
+ p--;
+ *(++p) = '\0';
+
+ /* gets(answer); */
+ fgets(answer,sizeof(answer),stdin);
+ answer[strlen(answer)-1] = '\0';
+
+ if (answer[0] == '\0') {
+ strcpy(answer, defaultAnswer);
+ printf("\t%s = %s\n",s,answer);
+ } else {
+ printf("\t%s set to %s\n",s,answer);
+ }
+}
+
+
+/* LpFilter()
+ *
+ * reference: "Digital Filters, 2nd edition"
+ * R.W. Hamming, pp. 178-179
+ *
+ * Izero() computes the 0th order modified bessel function of the first kind.
+ * (Needed to compute Kaiser window).
+ *
+ * LpFilter() computes the coeffs of a Kaiser-windowed low pass filter with
+ * the following characteristics:
+ *
+ * c[] = array in which to store computed coeffs
+ * frq = roll-off frequency of filter
+ * N = Half the window length in number of coeffs
+ * Beta = parameter of Kaiser window
+ * Num = number of coeffs before 1/frq
+ *
+ * Beta trades the rejection of the lowpass filter against the transition
+ * width from passband to stopband. Larger Beta means a slower
+ * transition and greater stopband rejection. See Rabiner and Gold
+ * (Theory and Application of DSP) under Kaiser windows for more about
+ * Beta. The following table from Rabiner and Gold gives some feel
+ * for the effect of Beta:
+ *
+ * All ripples in dB, width of transition band = D*N where N = window length
+ *
+ * BETA D PB RIP SB RIP
+ * 2.120 1.50 +-0.27 -30
+ * 3.384 2.23 0.0864 -40
+ * 4.538 2.93 0.0274 -50
+ * 5.658 3.62 0.00868 -60
+ * 6.764 4.32 0.00275 -70
+ * 7.865 5.0 0.000868 -80
+ * 8.960 5.7 0.000275 -90
+ * 10.056 6.4 0.000087 -100
+ */
+
+
+#define IzeroEPSILON 1E-21 /* Max error acceptable in Izero */
+
+static double Izero(double x)
+{
+ double sum, u, halfx, temp;
+ int n;
+
+ sum = u = n = 1;
+ halfx = x/2.0;
+ do {
+ temp = halfx/(double)n;
+ n += 1;
+ temp *= temp;
+ u *= temp;
+ sum += u;
+ } while (u >= IzeroEPSILON*sum);
+ return(sum);
+}
+
+
+void LpFilter(double c[], int N, double frq, double Beta, int Num)
+{
+ double IBeta, temp, inm1;
+ int i;
+
+ /* Calculate ideal lowpass filter impulse response coefficients: */
+ c[0] = 2.0*frq;
+ for (i=1; i<N; i++) {
+ temp = PI*(double)i/(double)Num;
+ c[i] = sin(2.0*temp*frq)/temp; /* Analog sinc function, cutoff = frq */
+ }
+
+ /*
+ * Calculate and Apply Kaiser window to ideal lowpass filter.
+ * Note: last window value is IBeta which is NOT zero.
+ * You're supposed to really truncate the window here, not ramp
+ * it to zero. This helps reduce the first sidelobe.
+ */
+ IBeta = 1.0/Izero(Beta);
+ inm1 = 1.0/((double)(N-1));
+ for (i=1; i<N; i++) {
+ temp = (double)i * inm1;
+ c[i] *= Izero(Beta*sqrt(1.0-temp*temp)) * IBeta;
+ }
+}
+
+
+/* Write a filter to a file
+ * Filter file format:
+ * file name: "F" Nmult "T" Nhc ".filter"
+ * 1st line: the string "ScaleFactor" followed by its value.
+ * 2nd line: the string "Length" followed by Nwing's value.
+ * 3rd line: the string "Nmult" followed by Nmult's value.
+ * 4th line: the string "Coeffs:" on a separate line.
+ * following lines: Nwing number of 16-bit impulse response values
+ * in the right wing of the impulse response (the Imp[] array).
+ * (Nwing is equal to Npc*(Nmult+1)/2+1, where Npc is defined in the
+ * file "resample.h".) Each coefficient is on a separate line.
+ * next line: the string "Differences:" on a separate line.
+ * following lines: Nwing number of 16-bit impulse-response
+ * successive differences: ImpD[i] = Imp[i+1] - Imp[i].
+ * ERROR codes:
+ * 0 - no error
+ * 1 - could not open file
+ */
+
+int writeFilter(HWORD Imp[], HWORD ImpD[], UHWORD LpScl, UHWORD Nmult,
+ UHWORD Nwing)
+{
+ char fname[30];
+ FILE *fp;
+ int i;
+
+ sprintf(fname, "F%dT%d.filter", Nmult, Nhc);
+ fp = fopen(fname, "w");
+ if (!fp)
+ return(1);
+ fprintf(fp, "ScaleFactor %d\n", LpScl);
+ fprintf(fp, "Length %d\n", Nwing);
+ fprintf(fp, "Nmult %d\n", Nmult);
+ fprintf(fp, "Coeffs:\n");
+ for (i=0; i<Nwing; i++) /* Put array of 16-bit filter coefficients */
+ fprintf(fp, "%d\n", Imp[i]);
+ fprintf(fp, "Differences:\n");
+ for (i=0; i<Nwing; i++) /* Put array of 16-bit filter coeff differences */
+ fprintf(fp, "%d\n", ImpD[i]);
+ fclose(fp);
+ printf("Wrote filter file '%s' in current directory.\n",fname);
+ return(0);
+}
+
+
+/* ERROR return codes:
+ * 0 - no error
+ * 1 - Nwing too large (Nwing is > MAXNWING)
+ * 2 - Froll is not in interval [0:1)
+ * 3 - Beta is < 1.0
+ * 4 - LpScl will not fit in 16-bits
+ *
+ * Made following global to avoid stack problems in Sun3 compilation: */
+
+#define MAXNWING 8192
+static double ImpR[MAXNWING];
+
+int makeFilter(HWORD Imp[], HWORD ImpD[], UHWORD *LpScl, UHWORD Nwing,
+ double Froll, double Beta)
+{
+ double DCgain, Scl, Maxh;
+ HWORD Dh;
+ int i, temp;
+
+ if (Nwing > MAXNWING) /* Check for valid parameters */
+ return(1);
+ if ((Froll<=0) || (Froll>1))
+ return(2);
+ if (Beta < 1)
+ return(3);
+
+ /*
+ * Design Kaiser-windowed sinc-function low-pass filter
+ */
+ LpFilter(ImpR, (int)Nwing, 0.5*Froll, Beta, Npc);
+
+ /* Compute the DC gain of the lowpass filter, and its maximum coefficient
+ * magnitude. Scale the coefficients so that the maximum coeffiecient just
+ * fits in Nh-bit fixed-point, and compute LpScl as the NLpScl-bit (signed)
+ * scale factor which when multiplied by the output of the lowpass filter
+ * gives unity gain. */
+ DCgain = 0;
+ Dh = Npc; /* Filter sampling period for factors>=1 */
+ for (i=Dh; i<Nwing; i+=Dh)
+ DCgain += ImpR[i];
+ DCgain = 2*DCgain + ImpR[0]; /* DC gain of real coefficients */
+
+ for (Maxh=i=0; i<Nwing; i++)
+ Maxh = MAX(Maxh, fabs(ImpR[i]));
+
+ Scl = ((1<<(Nh-1))-1)/Maxh; /* Map largest coeff to 16-bit maximum */
+ temp = fabs((1<<(NLpScl+Nh))/(DCgain*Scl));
+ if (temp >= 1<<16)
+ return(4); /* Filter scale factor overflows UHWORD */
+ *LpScl = temp;
+
+ /* Scale filter coefficients for Nh bits and convert to integer */
+ if (ImpR[0] < 0) /* Need pos 1st value for LpScl storage */
+ Scl = -Scl;
+ for (i=0; i<Nwing; i++) /* Scale them */
+ ImpR[i] *= Scl;
+ for (i=0; i<Nwing; i++) /* Round them */
+ Imp[i] = ImpR[i] + 0.5;
+
+ /* ImpD makes linear interpolation of the filter coefficients faster */
+ for (i=0; i<Nwing-1; i++)
+ ImpD[i] = Imp[i+1] - Imp[i];
+ ImpD[Nwing-1] = - Imp[Nwing-1]; /* Last coeff. not interpolated */
+
+ return(0);
+}
+
+
+/* Read-in a filter
+ * Filter file format:
+ * file name: "F" Nmult "T" Nhc ".filter"
+ * 1st line: the string "ScaleFactor" followed by its value.
+ * 2nd line: the string "Length" followed by Nwing's value.
+ * 3rd line: the string "Coeffs:" on separate line.
+ * Nwing number of 16-bit impulse response values in the right
+ * wing of the impulse response. (Length=Npc*(Nmult+1)/2+1,
+ * where originally Npc=2^9, and Nmult=13.) Each on separate line.
+ * The string "Differences:" on separate line.
+ * Nwing number of 16-bit impulse-response successive differences:
+ * ImpDiff[i] = Imp[i+1] - Imp[i].
+ *
+ * ERROR return codes:
+ * 0 - no error
+ * 1 - file not found
+ * 2 - invalid ScaleFactor in file
+ * 3 - invalid Length in file
+ * 4 - invalid Nmult in file
+ */
+int readFilter(char *filterFile, HWORD **ImpP, HWORD **ImpDP, UHWORD *LpScl,
+ UHWORD *Nmult, UHWORD *Nwing)
+{
+ char *fname;
+ FILE *fp;
+ int i, temp;
+ HWORD *Imp,*ImpD;
+
+ if (!filterFile || !(*filterFile)) {
+ fname = (char *) malloc(32);
+ if ((*Nmult)>0 && ((*Nmult)&1))
+ sprintf(fname, "F%dT%d.filter", *Nmult, Nhc);
+ else
+ sprintf(fname, "F65dT%d.filter", Nhc);
+ } else
+ fname = filterFile;
+
+ fp = fopen(fname, "r");
+ if (fp == NULL)
+ return(1);
+
+ fscanf(fp, "ScaleFactor ");
+ if (1 != fscanf(fp,"%d",&temp))
+ return(2);
+ *LpScl = temp;
+
+ fscanf(fp, "\nLength ");
+ if (1 != fscanf(fp,"%d",&temp))
+ return(3);
+ *Nwing = temp;
+
+ fscanf(fp, "\nNmult ");
+ if (1 != fscanf(fp,"%d",&temp))
+ return(4);
+ *Nmult = temp;
+
+ Imp = (HWORD *) malloc(*Nwing * sizeof(HWORD));
+
+ fscanf(fp, "\nCoeffs:\n");
+ for (i=0; i<*Nwing; i++) { /* Get array of 16-bit filter coefficients */
+ fscanf(fp, "%d\n", &temp);
+ Imp[i] = temp;
+ }
+
+ ImpD = (HWORD *) malloc(*Nwing * sizeof(HWORD));
+
+ fscanf(fp, "\nDifferences:\n");
+ for (i=0; i<*Nwing; i++) { /* Get array of 16bit filter coeff differences */
+ fscanf(fp, "%d\n", &temp);
+ ImpD[i] = temp;
+ }
+
+ fclose(fp);
+ if (!filterFile || !(*filterFile))
+ free(fname);
+ *ImpP = Imp;
+ *ImpDP = ImpD;
+ return(0);
+}
+
+
+WORD FilterUp(HWORD Imp[], HWORD ImpD[],
+ UHWORD Nwing, BOOL Interp,
+ HWORD *Xp, HWORD Ph, HWORD Inc)
+{
+ HWORD *Hp, *Hdp = NULL, *End;
+ HWORD a = 0;
+ WORD v, t;
+
+ v=0;
+ Hp = &Imp[Ph>>Na];
+ End = &Imp[Nwing];
+ if (Interp) {
+ Hdp = &ImpD[Ph>>Na];
+ a = Ph & Amask;
+ }
+ if (Inc == 1) /* If doing right wing... */
+ { /* ...drop extra coeff, so when Ph is */
+ End--; /* 0.5, we don't do too many mult's */
+ if (Ph == 0) /* If the phase is zero... */
+ { /* ...then we've already skipped the */
+ Hp += Npc; /* first sample, so we must also */
+ Hdp += Npc; /* skip ahead in Imp[] and ImpD[] */
+ }
+ }
+ if (Interp)
+ while (Hp < End) {
+ t = *Hp; /* Get filter coeff */
+ t += (((WORD)*Hdp)*a)>>Na; /* t is now interp'd filter coeff */
+ Hdp += Npc; /* Filter coeff differences step */
+ t *= *Xp; /* Mult coeff by input sample */
+ if (t & (1<<(Nhxn-1))) /* Round, if needed */
+ t += (1<<(Nhxn-1));
+ t >>= Nhxn; /* Leave some guard bits, but come back some */
+ v += t; /* The filter output */
+ Hp += Npc; /* Filter coeff step */
+ Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */
+ }
+ else
+ while (Hp < End) {
+ t = *Hp; /* Get filter coeff */
+ t *= *Xp; /* Mult coeff by input sample */
+ if (t & (1<<(Nhxn-1))) /* Round, if needed */
+ t += (1<<(Nhxn-1));
+ t >>= Nhxn; /* Leave some guard bits, but come back some */
+ v += t; /* The filter output */
+ Hp += Npc; /* Filter coeff step */
+ Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */
+ }
+ return(v);
+}
+
+WORD FilterUD( HWORD Imp[], HWORD ImpD[],
+ UHWORD Nwing, BOOL Interp,
+ HWORD *Xp, HWORD Ph, HWORD Inc, UHWORD dhb)
+{
+ HWORD a;
+ HWORD *Hp, *Hdp, *End;
+ WORD v, t;
+ UWORD Ho;
+
+ v=0;
+ Ho = (Ph*(UWORD)dhb)>>Np;
+ End = &Imp[Nwing];
+ if (Inc == 1) /* If doing right wing... */
+ { /* ...drop extra coeff, so when Ph is */
+ End--; /* 0.5, we don't do too many mult's */
+ if (Ph == 0) /* If the phase is zero... */
+ Ho += dhb; /* ...then we've already skipped the */
+ } /* first sample, so we must also */
+ /* skip ahead in Imp[] and ImpD[] */
+ if (Interp)
+ while ((Hp = &Imp[Ho>>Na]) < End) {
+ t = *Hp; /* Get IR sample */
+ Hdp = &ImpD[Ho>>Na]; /* get interp (lower Na) bits from diff table*/
+ a = Ho & Amask; /* a is logically between 0 and 1 */
+ t += (((WORD)*Hdp)*a)>>Na; /* t is now interp'd filter coeff */
+ t *= *Xp; /* Mult coeff by input sample */
+ if (t & 1<<(Nhxn-1)) /* Round, if needed */
+ t += 1<<(Nhxn-1);
+ t >>= Nhxn; /* Leave some guard bits, but come back some */
+ v += t; /* The filter output */
+ Ho += dhb; /* IR step */
+ Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */
+ }
+ else
+ while ((Hp = &Imp[Ho>>Na]) < End) {
+ t = *Hp; /* Get IR sample */
+ t *= *Xp; /* Mult coeff by input sample */
+ if (t & 1<<(Nhxn-1)) /* Round, if needed */
+ t += 1<<(Nhxn-1);
+ t >>= Nhxn; /* Leave some guard bits, but come back some */
+ v += t; /* The filter output */
+ Ho += dhb; /* IR step */
+ Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */
+ }
+ return(v);
+}
+
+/*
+ * double zerox(Data, Factor)
+ * HWORD *Data;
+ * double Factor;
+ * Given a pointer into a sound sample, this function uses a low-pass
+ * filter to estimate the x coordinate of the zero-crossing which must ocurr
+ * between Data[0] and Data[1]. This value is returned as the value of the
+ * function. A return value of -100 indicates there was no zero-crossing in
+ * the x interval [-1,2]. Factor is the resampling factor: Rate(out) /
+ * Rate(in). Nmult (which determines which filter is used) is passed the
+ * zerox's initialization routine: initZerox(Nmult)
+ * UHWORD Nmult;
+ */
+
+static UHWORD LpScl, Nmult, Nwing;
+static HWORD *Imp;
+static HWORD *ImpD;
+
+/* ERROR return values:
+ * 0 - no error
+ * 1 - Nmult is even (should be odd)
+ * 2 - filter file not found
+ * 3 - invalid ScaleFactor in input file
+ * 4 - invalid Length in file
+ * 5 - invalid Nmult in file
+ */
+int initZerox(UHWORD tempNmult)
+{
+ int err;
+
+ /* Check for illegal input values */
+ if (!(tempNmult % 2))
+ return(1);
+ err = readFilter(NULL, (HWORD **)&Imp, (HWORD **)&ImpD,
+ &LpScl, &tempNmult, &Nwing);
+ if (err)
+ return(1+err);
+
+ Nmult = tempNmult;
+ return(0);
+}
+
+#define MAXITER 64
+#define ZeroxEPSILON (1E-4)
+#define ZeroxMAXERROR (5.0)
+
+double zerox(HWORD *Data, double Factor)
+{
+ double x, out;
+ double lo, hi;
+ double dh;
+ UWORD dhb;
+ WORD v;
+ int i;
+
+ if (!Data[0])
+ return (0.0);
+ if (!Data[1])
+ return (1.0);
+
+ if (Data[0] < Data[1])
+ {
+ lo = -1.0;
+ hi = 2.0;
+ }
+ else
+ {
+ lo = 2.0;
+ hi = -1.0;
+ }
+ dh = (Factor<1) ? (Factor*Npc) : (Npc);
+ dhb = dh * (1<<Na) + 0.5;
+
+ for (i=0; i<MAXITER; i++)
+ {
+ x = (hi+lo)/2.0;
+ v = FilterUD(Imp,ImpD,Nwing,TRUE,Data, (HWORD)(x*Pmask), -1,dhb);
+ v += FilterUD(Imp,ImpD,Nwing,TRUE,Data+1,(HWORD)((1-x)*Pmask), 1,dhb);
+ v >>= Nhg;
+ v *= LpScl;
+ out = (double)v / (double)(1<<NLpScl);
+ if (out < 0.0)
+ lo = x;
+ else
+ hi = x;
+ if (ABS(out) <= ZeroxEPSILON)
+ return(x);
+ }
+ printf("|ZeroX Error| x:%g, \t Data[x]:%d, \t Data[x+1]:%d\n",
+ x, *Data, *(Data+1));
+ printf("|\tABS(out):%g \t EPSILON:%g\n", ABS(out),ZeroxEPSILON);
+ if (ABS(out) <= ZeroxMAXERROR)
+ return(x);
+ return(-100.0);
+}
+
+
+BOOL Query(char *prompt, BOOL deflt, char *help)
+{
+ char s[80];
+
+ while (TRUE)
+ {
+ sprintf(s,"\n%s%s", prompt, (*help) ? " (Type ? for help)" : "");
+ getstr(s,(deflt)?"yes":"no",s);
+ if (*s=='?' && *help)
+ printf(help);
+ if (*s=='Y' || *s=='y')
+ return(TRUE);
+ if (*s=='N' || *s=='n')
+ return(FALSE);
+ }
+}
+
+
+char *GetString(char *prompt, char *deflt, char *help)
+{
+ static char s[200];
+
+ while (TRUE)
+ {
+ sprintf(s,"\n%s%s",prompt, (*help) ? " (Type ? for Help)" : "");
+ getstr(s,deflt,s);
+ if (*s=='?' && *help)
+ printf(help);
+ else
+ return(s);
+ }
+}
+
+
+double GetDouble(char *title, double deflt, char *help)
+{
+ char s[80],sdeflt[80];
+ double newval;
+
+ while (TRUE)
+ {
+ sprintf(s,"\n%s:%s",title, (*help) ? " (Type ? for Help)" : "");
+ sprintf(sdeflt,"%g",deflt);
+ getstr(s,sdeflt,s);
+ if (*s=='?' && *help)
+ printf(help);
+ else
+ {
+ if (!sscanf(s,"%lf",&newval))
+ return(deflt);
+ return(newval);
+ }
+ }
+}
+
+
+unsigned short GetUShort(char *title, unsigned short deflt, char *help)
+{
+ char s[80],sdeflt[80];
+ int newval;
+
+ while (TRUE)
+ {
+ sprintf(s,"\n%s:%s",title, (*help) ? " (Type ? for Help)" : "");
+ sprintf(sdeflt,"%d",deflt);
+ getstr(s,sdeflt,s);
+ if (*s=='?' && *help)
+ printf(help);
+ else
+ {
+ if (!sscanf(s,"%d",&newval))
+ printf("unchanged (%d)\n",(newval=deflt));
+ if (newval < 0)
+ printf("Error: value must be >= zero\n");
+ else
+ return(newval);
+ }
+ }
+}
diff --git a/third_party/resample/src/filterkit.h b/third_party/resample/src/filterkit.h
new file mode 100644
index 00000000..c0d5e97c
--- /dev/null
+++ b/third_party/resample/src/filterkit.h
@@ -0,0 +1,159 @@
+/*:filterkit.h */
+
+#include "stdefs.h"
+
+/*
+ * 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() - Calls LpFilter() to create a filter, then scales the double
+ * coeffs into an 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.
+ * 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.
+ */
+
+void LpFilter(double c[], int N, double frq, double Beta, int Num);
+/*
+ * reference: "Digital Filters, 2nd edition"
+ * R.W. Hamming, pp. 178-179
+ *
+ * LpFilter() computes the coeffs of a Kaiser-windowed low pass filter with
+ * the following characteristics:
+ *
+ * c[] = array in which to store computed coeffs
+ * frq = roll-off frequency of filter
+ * N = Half the window length in number of coeffs
+ * Beta = parameter of Kaiser window
+ * Num = number of coeffs before 1/frq
+ *
+ * Beta trades the rejection of the lowpass filter against the transition
+ * width from passband to stopband. Larger Beta means a slower
+ * transition and greater stopband rejection. See Rabiner and Gold
+ * (Theory and Application of DSP) under Kaiser windows for more about
+ * Beta. The following table from Rabiner and Gold gives some feel
+ * for the effect of Beta:
+ *
+ * All ripples in dB, width of transition band = D*N where N = window length
+ *
+ * BETA D PB RIP SB RIP
+ * 2.120 1.50 +-0.27 -30
+ * 3.384 2.23 0.0864 -40
+ * 4.538 2.93 0.0274 -50
+ * 5.658 3.62 0.00868 -60
+ * 6.764 4.32 0.00275 -70
+ * 7.865 5.0 0.000868 -80
+ * 8.960 5.7 0.000275 -90
+ * 10.056 6.4 0.000087 -100
+ */
+
+int writeFilter(HWORD Imp[], HWORD ImpD[], UHWORD LpScl, UHWORD Nmult, UHWORD Nwing);
+/*
+ * Write a filter to a file
+ * Filter file format:
+ * file name: "F" Nmult "T" Nhc ".filter"
+ * 1st line: the string "ScaleFactor" followed by its value.
+ * 2nd line: the string "Length" followed by Nwing's value.
+ * 3rd line: the string "Coeffs:" on a separate line.
+ * following lines: Nwing number of 16-bit impulse response values
+ * in the right wing of the impulse response (the Imp[] array).
+ * (Nwing is equal to Npc*(Nmult+1)/2+1, where Npc is defined in the
+ * file "resample.h".) Each coefficient is on a separate line.
+ * next line: the string "Differences:" on a separate line.
+ * following lines: Nwing number of 16-bit impulse-response
+ * successive differences: ImpD[i] = Imp[i+1] - Imp[i].
+ * ERROR codes:
+ * 0 - no error
+ * 1 - could not open file
+ */
+
+int makeFilter(HWORD Imp[], HWORD ImpD[], UHWORD *LpScl, UHWORD Nwing,
+ double Froll, double Beta);
+/*
+ * makeFilter
+ * ERROR return codes:
+ * 0 - no error
+ * 1 - Nwing too large (Nwing is > MAXNWING)
+ * 2 - Froll is not in interval [0:1)
+ * 3 - Beta is < 1.0
+ * 4 - LpScl will not fit in 16-bits
+ */
+
+int readFilter(char *filterFile,
+ HWORD **ImpP, HWORD **ImpDP, UHWORD *LpScl,
+ UHWORD *Nmult, UHWORD *Nwing);
+/*
+ * Read-in a filter
+ * Filter file format:
+ * Default file name: "F" Nmult "T" Nhc ".filter"
+ * 1st line: the string "ScaleFactor" followed by its value.
+ * 2nd line: the string "Length" followed by Nwing's value.
+ * 3rd line: the string "Coeffs:" on separate line.
+ * Nwing number of 16-bit impulse response values in the right
+ * wing of the impulse response. (Length=Npc*(Nmult+1)/2+1,
+ * where originally Npc=2^9, and Nmult=13.) Each on separate line.
+ * The string "Differences:" on separate line.
+ * Nwing number of 16-bit impulse-response successive differences:
+ * ImpDiff[i] = Imp[i+1] - Imp[i].
+ *
+ * ERROR return codes:
+ * 0 - no error
+ * 1 - file not found
+ * 2 - invalid ScaleFactor in file
+ * 3 - invalid Length in file
+ */
+
+WORD FilterUp(HWORD Imp[], HWORD ImpD[], UHWORD Nwing, BOOL Interp,
+ HWORD *Xp, HWORD Inc, HWORD Ph);
+
+WORD FilterUD(HWORD Imp[], HWORD ImpD[], UHWORD Nwing, BOOL Interp,
+ HWORD *Xp, HWORD Ph, HWORD Inc, UHWORD dhb);
+
+int initZerox(UHWORD tempNmult);
+/*
+ * initZerox
+ * ERROR return values:
+ * 0 - no error
+ * 1 - Nmult is even (should be odd)
+ * 2 - filter file not found
+ * 3 - invalid ScaleFactor in input file
+ * 4 - invalid Length in file
+ */
+
+/*
+ * zerox
+ * Given a pointer into a sound sample, this function uses a low-pass
+ * filter to estimate the x coordinate of the zero-crossing which must ocurr
+ * between Data[0] and Data[1]. This value is returned as the value of the
+ * function. A return value of -100 indicates there was no zero-crossing in
+ * the x interval [-1,2]. Factor is the resampling factor: Rate(out) /
+ * Rate(in). Nmult (which determines which filter is used) is passed the
+ * zerox's initialization routine: initZerox(Nmult)
+ */
+double zerox(HWORD *Data, double Factor);
+
+BOOL Query(char *prompt, BOOL deflt, char *help);
+
+unsigned short GetUShort(char *title, unsigned short deflt, char *help);
+
+double GetDouble(char *title, double deflt, char *help);
+
+char *GetString(char *prompt, char *deflt, char *help);
+
+#define GetUHWORD(x,y,z) GetUShort(x,y,z)
+
diff --git a/third_party/resample/src/largefilter.h b/third_party/resample/src/largefilter.h
new file mode 100644
index 00000000..7a86dd40
--- /dev/null
+++ b/third_party/resample/src/largefilter.h
@@ -0,0 +1,16411 @@
+/* Included by resamplesubs.c */
+
+/*
+
+ USAGE: resample -expensiveFilter ...
+
+The -expensiveFilter option (-e) for resample selects the 'expensive'
+preloaded resampling filter. The default filter requires an
+oversampling factor of around 20% to avoid aliasing. The expensive
+filter is five times more computationally expensive and requires only
+about a 5-10% oversampling factor. Both filters have comparable
+stop-band attenuations (approximately 80 dB). If both options -f and
+-e are present, the last one on the command line takes effect. The
+expensive filter is not yet documented because its cut-off frequency
+should be retuned slightly for optimal performance. Also, we plan to
+compute truly optimized resampling filters sometime in the future. In
+the meantime, the default filter is fast, well tuned, and works very
+well for its level of computational expense.
+
+*/
+
+#define LARGE_FILTER_NMULT ((HWORD)65)
+#define LARGE_FILTER_SCALE 14746 /* Unity-gain scale factor */
+#define LARGE_FILTER_NWING 8192 /* Filter table length */
+static HWORD LARGE_FILTER_IMP[] /* Impulse response */ = {
+32767,
+32766,
+32764,
+32761,
+32756,
+32750,
+32743,
+32734,
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+32713,
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diff --git a/third_party/resample/src/resample.c b/third_party/resample/src/resample.c
new file mode 100644
index 00000000..73122704
--- /dev/null
+++ b/third_party/resample/src/resample.c
@@ -0,0 +1,238 @@
+/*
+ * FILE: resample.c
+ * Sampling-rate-conversion main program (command line usage)
+ */
+
+static char resampleVersion[]
+ = "\n\tresample version 1.9 (Feb. 1, 2006 - jos@ccrma.stanford.edu)\n\n\
+Copyright 1982-2006 by Julius Smith.\n\
+This is free software. See the Lesser GNU Public License (LGPL) for copying conditions.\n\
+There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A\n\
+PARTICULAR PURPOSE.\n\n\
+";
+
+#define USAGE "\
+\n\
+USAGE: One of the following:\n\
+\n\
+ resample -to srate [-noFilterInterp] [-linearSignalInterp] [-f filterFile] [-terse] inputSoundFile outputSoundFile\n\
+ resample -by factor [options as above] inputSoundFile outputSoundFile\n\
+ resample -version\n\
+\n\
+Options can be abbreviated.\n\n\
+Report bugs to <bug-resample@w3k.org>.\n\n\
+"
+
+#include "filterkit.h"
+#include "resample.h"
+#include "sndlibextra.h"
+
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+static int trace = 1; /* controls verbosity of output */
+
+static char comment[256] = "";
+
+static void fail(char *s)
+{
+ fprintf(stderr,"\n*** resample: %s \n",s); /* Display error message */
+ fprintf(stderr,USAGE);
+ exit(1); /* Exit, indicating error */
+}
+
+static void fails(char *s, char *s2)
+{
+ printf("resample: "); /* Display error message */
+ printf(s,s2);
+ printf("\n\n");
+ exit(1); /* Exit, indicating error */
+}
+
+
+int main(int argc, char *argv[])
+{
+ double factor = -2.0; /* factor = Sndout/Sndin */
+ double newsrate=0;
+ BOOL interpFilt = TRUE; /* TRUE means interpolate filter coeffs */
+ BOOL largeFilter = FALSE; /* TRUE means use 65-tap FIR filter */
+ BOOL linearInterp = FALSE; /* TRUE => no filter, linearly interpolate */
+ BOOL knowFactor = FALSE; /* Used to detect insufficient command-line spec */
+ int inCount, outCount, outCountReal;
+ int infd, outfd, insrate, nChans, result;
+ int inType, inFormat;
+ int outType, outFormat;
+
+ struct stat statbuf;
+ char *insfname, *outsfname, *argv0;
+ char filterFile[512] = "";
+
+ if (argc == 1) {
+ fprintf(stderr, USAGE);
+ exit(1);
+ }
+
+ argv0 = argv[0];
+ while (--argc && **(++argv)=='-') {
+ ++(argv[0]); /* skip over '-' */
+ switch (*argv[0]) {
+ case 'a': /* -aaaQuality (old name) */
+ case 'e': /* -expensive */
+ largeFilter = TRUE;
+ if (trace)
+ printf("Choosing higher quality filter.\n");
+ break;
+ case 'b': /* -by factor */
+ if (--argc)
+ sscanf(*(++argv),"%lf",&factor);
+ if (trace)
+ printf("Sampling-rate conversion factor set to %f.\n",factor);
+ knowFactor = TRUE;
+ break;
+ case 'f': /* -filter filterFile */
+ if (--argc)
+ strcpy(filterFile, *++argv);
+ else
+ fail("Need to specify filter file name");
+ if (trace)
+ printf("Filter file set to %s.\n",filterFile);
+ break;
+ case 'l': /* -linearInpterpolation */
+ linearInterp = TRUE;
+ if (trace)
+ printf("Using linear instead of bandlimited interpolation\n");
+ break;
+ case 'n': /* -noFilterInterpolation */
+ interpFilt = FALSE;
+ if (trace)
+ printf("Filter-table interpolation disabled.\n");
+ break;
+ case 't':
+ if (*(argv[0]+1) == 'e') { /* -terse */
+ trace = 0;
+ break;
+ }
+ if (--argc) /* -to srate */
+ sscanf(*(++argv),"%lf",&newsrate);
+ if (trace)
+ printf("Target sampling-rate set to %f.\n",newsrate);
+ knowFactor = TRUE;
+ break;
+ case 'v': /* -version */
+ printf(resampleVersion);
+ if (argc == 1)
+ exit(0);
+ break;
+ default:
+ fprintf(stderr,"Unknown switch -%s\n",argv[0]);
+ fprintf(stderr,USAGE);
+ exit(1);
+ }
+ }
+
+ if (!knowFactor)
+ fail("Must specify sampling-rate conversion factor via '-to' or '-by' option");
+
+ if (argc < 1)
+ fail("Need to specify input soundfile");
+ insfname = *argv;
+
+ if (argc < 2) {
+ fprintf(stderr, USAGE);
+ exit(1);
+ }
+ else
+ outsfname = *++argv;
+
+ /* Test whether output file name exists. If so, bail... */
+ result = stat(outsfname, &statbuf);
+ if (result != -1)
+ fails("\"%s\" already exists", outsfname);
+ if (errno != ENOENT)
+ fails("Error creating output file (%s)", strerror(errno));
+
+ if (trace)
+ printf("Writing output to \"%s\".\n", outsfname);
+
+ /* Open input file and gather info from its header */
+ // resample-1.8: infd = sndlib_open_read(insfname);
+ infd = mus_sound_open_input(insfname);
+ if (infd == -1)
+ fails("Could not open input file \"%s\"", insfname);
+ if (NOT_A_SOUND_FILE(mus_header_type()))
+ fails("\"%s\" is probably not a sound file.", insfname);
+ nChans = mus_header_chans();
+ insrate = mus_header_srate();
+ inCount = mus_header_samples();
+ inType = mus_header_type(); /* header type (i.e. aiff, wave, etc) (see sndlib.h) */
+ inFormat = mus_header_format(); /* data format (see sndlib.h) */
+ inCount /= nChans; /* to get sample frames */
+
+/*
+ * Set output soundfile format.
+ * See sndlib.h for supported types (e.g., MUS_RIFF).
+ */
+ outType = inType;
+ outFormat = inFormat;
+
+ /* Compute sampling rate conversion factor, if not specified. */
+ if (newsrate>0) {
+ if (factor>0)
+ fprintf(stderr, "Command-line sampling-rate conversion factor "
+ "ignored ... the '-to' option overrides the '-by' option.\n");
+ factor = newsrate / (double)insrate;
+ if (trace)
+ printf("Sampling rate conversion factor set to %f\n",factor);
+ }
+
+ if (factor < 0) {
+ factor = -factor;
+ factor = GetDouble("Sampling-rate conversion factor",factor,"");
+ }
+
+ if (newsrate <= 0)
+ newsrate = (int)((double)insrate * factor + 0.5); /* round */
+
+ sprintf(comment,"%s -by %f %s%s%s%s%s%s%s %s",argv0,factor,
+ (largeFilter?"-expensiveFilter ":""),
+ (strcmp(filterFile,"")==0?"":"-f "),
+ (strcmp(filterFile,"")==0?"":filterFile),
+ (strcmp(filterFile,"")==0?"":" "),
+ (linearInterp? "-linearSigInterp ":""),
+ (interpFilt? "":"-noFilterInterp "),
+ insfname, outsfname);
+
+ outfd = sndlib_create(outsfname, inType, inFormat, newsrate, nChans, comment);
+ if (outfd == -1)
+ fails("Could not create output file \"%s\"", outsfname);
+ outCount = (int)(factor * (double)inCount + 0.5); /* output frames */
+
+ printf("\nStarting Conversion\n");
+ outCountReal = resample(factor, infd, outfd, inCount, outCount, nChans,
+ interpFilt, linearInterp, largeFilter, filterFile);
+
+ if (outCountReal <= 0)
+ fail("Conversion factor out of range");
+
+ if (trace && (outCount != outCountReal))
+ fprintf(stderr,
+ "outCount = %d, outCountReal = %d\n",outCount,outCountReal);
+
+ // resample-1.8: sndlib_close(infd, FALSE, 0, 0, 0);
+ mus_file_close(infd);
+
+ /* Output samps already written; just update header and close file. */
+ // resample-1.8: if (sndlib_close(outfd, 1, outType, outFormat, outCountReal * nChans))
+ // resample-1.8: fails("Error closing output file (%s)", strerror(errno));
+ mus_file_close(outfd);
+ int sound_bytes = outCountReal * nChans * mus_bytes_per_sample(outFormat);
+ mus_header_change_data_size(outsfname, inType, sound_bytes);
+
+ printf("\nConversion Finished: %d output samples.\n\n",outCount);
+
+ return(0);
+}
diff --git a/third_party/resample/src/resample.h b/third_party/resample/src/resample.h
new file mode 100644
index 00000000..c09e891b
--- /dev/null
+++ b/third_party/resample/src/resample.h
@@ -0,0 +1,86 @@
+/*
+ * FILE: resample.h
+ *
+ * The configuration constants below govern
+ * the number of bits in the input sample and filter coefficients, the
+ * number of bits to the right of the binary-point for fixed-point math, etc.
+ *
+ */
+
+#include "stdefs.h"
+
+/* Conversion constants */
+#define Nhc 8
+#define Na 7
+#define Np (Nhc+Na)
+#define Npc (1<<Nhc)
+#define Amask ((1<<Na)-1)
+#define Pmask ((1<<Np)-1)
+#define Nh 16
+#define Nb 16
+#define Nhxn 14
+#define Nhg (Nh-Nhxn)
+#define NLpScl 13
+
+/* Description of constants:
+ *
+ * Npc - is the number of look-up values available for the lowpass filter
+ * between the beginning of its impulse response and the "cutoff time"
+ * of the filter. The cutoff time is defined as the reciprocal of the
+ * lowpass-filter cut off frequence in Hz. For example, if the
+ * lowpass filter were a sinc function, Npc would be the index of the
+ * impulse-response lookup-table corresponding to the first zero-
+ * crossing of the sinc function. (The inverse first zero-crossing
+ * time of a sinc function equals its nominal cutoff frequency in Hz.)
+ * Npc must be a power of 2 due to the details of the current
+ * implementation. The default value of 512 is sufficiently high that
+ * using linear interpolation to fill in between the table entries
+ * gives approximately 16-bit accuracy in filter coefficients.
+ *
+ * Nhc - is log base 2 of Npc.
+ *
+ * Na - is the number of bits devoted to linear interpolation of the
+ * filter coefficients.
+ *
+ * Np - is Na + Nhc, the number of bits to the right of the binary point
+ * in the integer "time" variable. To the left of the point, it indexes
+ * the input array (X), and to the right, it is interpreted as a number
+ * between 0 and 1 sample of the input X. Np must be less than 16 in
+ * this implementation.
+ *
+ * Nh - is the number of bits in the filter coefficients. The sum of Nh and
+ * the number of bits in the input data (typically 16) cannot exceed 32.
+ * Thus Nh should be 16. The largest filter coefficient should nearly
+ * fill 16 bits (32767).
+ *
+ * Nb - is the number of bits in the input data. The sum of Nb and Nh cannot
+ * exceed 32.
+ *
+ * Nhxn - is the number of bits to right shift after multiplying each input
+ * sample times a filter coefficient. It can be as great as Nh and as
+ * small as 0. Nhxn = Nh-2 gives 2 guard bits in the multiply-add
+ * accumulation. If Nhxn=0, the accumulation will soon overflow 32 bits.
+ *
+ * Nhg - is the number of guard bits in mpy-add accumulation (equal to Nh-Nhxn)
+ *
+ * NLpScl - is the number of bits allocated to the unity-gain normalization
+ * factor. The output of the lowpass filter is multiplied by LpScl and
+ * then right-shifted NLpScl bits. To avoid overflow, we must have
+ * Nb+Nhg+NLpScl < 32.
+ */
+
+
+int resample( /* number of output sample returned */
+ double factor, /* factor = Sndout/Sndin */
+ int infd, /* input and output file descriptors */
+ int outfd,
+ int inCount, /* number of input samples to convert */
+ int outCount, /* number of output samples to compute */
+ int nChans, /* number of sound channels (1 or 2) */
+ BOOL interpFilt, /* TRUE means interpolate filter coeffs */
+ int fastMode, /* 0 = highest quality, slowest speed */
+ BOOL largeFilter, /* TRUE means use 65-tap FIR filter */
+ char *filterFile /* NULL for internal filter, else filename */
+);
+
+//#define MUS_SAMPLE_TYPE mus_sample_t; // more incompatible changes to sndlib
diff --git a/third_party/resample/src/resamplesubs.c b/third_party/resample/src/resamplesubs.c
new file mode 100644
index 00000000..920e56e6
--- /dev/null
+++ b/third_party/resample/src/resamplesubs.c
@@ -0,0 +1,520 @@
+/* resamplesubs.c - sampling rate conversion subroutines */
+// Altered version
+
+#include "resample.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+
+#define IBUFFSIZE 4096 /* Input buffer size */
+
+#include "smallfilter.h"
+#include "largefilter.h"
+
+#include "filterkit.h"
+#include "sndlibextra.h"
+
+#ifdef WITH_PJ
+#include "resamplesubs.h"
+
+unsigned resample_LARGE_FILTER_NMULT = LARGE_FILTER_NMULT;
+unsigned resample_LARGE_FILTER_NWING = LARGE_FILTER_NWING;
+unsigned resample_LARGE_FILTER_SCALE = LARGE_FILTER_SCALE;
+short* resample_LARGE_FILTER_IMP = LARGE_FILTER_IMP;
+short* resample_LARGE_FILTER_IMPD = LARGE_FILTER_IMPD;
+
+unsigned resample_SMALL_FILTER_NMULT = SMALL_FILTER_NMULT;
+unsigned resample_SMALL_FILTER_NWING = SMALL_FILTER_NWING;
+unsigned resample_SMALL_FILTER_SCALE = SMALL_FILTER_SCALE;
+short* resample_SMALL_FILTER_IMP = SMALL_FILTER_IMP;
+short* resample_SMALL_FILTER_IMPD = SMALL_FILTER_IMPD;
+#endif
+
+
+/* CAUTION: Assumes we call this for only one resample job per program run! */
+/* return: 0 - notDone */
+/* >0 - index of last sample */
+static int
+readData(int infd, /* input file descriptor */
+ int inCount, /* _total_ number of frames in input file */
+ HWORD *outPtr1, /* array receiving left chan samps */
+ HWORD *outPtr2, /* array receiving right chan samps */
+ int dataArraySize, /* size of these arrays */
+ int nChans,
+ int Xoff) /* read into input array starting at this index */
+{
+ int i, Nsamps, nret;
+ static unsigned int framecount; /* frames previously read */
+ static mus_sample_t **ibufs = NULL;
+
+ if (ibufs == NULL) { /* first time called, so allocate it */
+ ibufs = sndlib_allocate_buffers(nChans, dataArraySize);
+ if (ibufs == NULL) {
+ fprintf(stderr, "readData: Can't allocate input buffers!\n");
+ exit(1);
+ }
+ framecount = 0; /* init this too */
+ }
+
+ Nsamps = dataArraySize - Xoff; /* Calculate number of samples to get */
+ outPtr1 += Xoff; /* Start at designated sample number */
+ outPtr2 += Xoff;
+
+ nret = mus_file_read(infd, 0, Nsamps - 1, nChans, ibufs);
+ if (nret < 0) {
+ fprintf(stderr, "readData: Can't read data!\n");
+ exit(1);
+ }
+
+ /* NB: sndlib pads ibufs with zeros if it reads past EOF. */
+ if (nChans == 1) {
+ for (i = 0; i < Nsamps; i++)
+ *outPtr1++ = MUS_SAMPLE_TYPE_TO_HWORD(ibufs[0][i]);
+ }
+ else {
+ for (i = 0; i < Nsamps; i++) {
+ *outPtr1++ = MUS_SAMPLE_TYPE_TO_HWORD(ibufs[0][i]);
+ *outPtr2++ = MUS_SAMPLE_TYPE_TO_HWORD(ibufs[1][i]);
+ }
+ }
+
+ framecount += Nsamps;
+
+ if (framecount >= (unsigned)inCount) /* return index of last samp */
+ return (((Nsamps - (framecount - inCount)) - 1) + Xoff);
+ else
+ return 0;
+}
+
+
+#ifdef DEBUG
+static int pof = 0; /* positive overflow count */
+static int nof = 0; /* negative overflow count */
+#endif
+
+static INLINE HWORD WordToHword(WORD v, int scl)
+{
+ HWORD out;
+ WORD llsb = (1<<(scl-1));
+ v += llsb; /* round */
+ v >>= scl;
+ if (v>MAX_HWORD) {
+#ifdef DEBUG
+ if (pof == 0)
+ fprintf(stderr, "*** resample: sound sample overflow\n");
+ else if ((pof % 10000) == 0)
+ fprintf(stderr, "*** resample: another ten thousand overflows\n");
+ pof++;
+#endif
+ v = MAX_HWORD;
+ } else if (v < MIN_HWORD) {
+#ifdef DEBUG
+ if (nof == 0)
+ fprintf(stderr, "*** resample: sound sample (-) overflow\n");
+ else if ((nof % 1000) == 0)
+ fprintf(stderr, "*** resample: another thousand (-) overflows\n");
+ nof++;
+#endif
+ v = MIN_HWORD;
+ }
+ out = (HWORD) v;
+ return out;
+}
+
+/* Sampling rate conversion using linear interpolation for maximum speed.
+ */
+STATIC int
+ SrcLinear(HWORD X[], HWORD Y[], double factor, UWORD *Time, UHWORD Nx)
+{
+ HWORD iconst;
+ HWORD *Xp, *Ystart;
+ WORD v,x1,x2;
+
+ double dt; /* Step through input signal */
+ UWORD dtb; /* Fixed-point version of Dt */
+ UWORD endTime; /* When Time reaches EndTime, return to user */
+
+ dt = 1.0/factor; /* Output sampling period */
+ dtb = dt*(1<<Np) + 0.5; /* Fixed-point representation */
+
+ Ystart = Y;
+ endTime = *Time + (1<<Np)*(WORD)Nx;
+ while (*Time < endTime)
+ {
+ iconst = (*Time) & Pmask;
+ Xp = &X[(*Time)>>Np]; /* Ptr to current input sample */
+ x1 = *Xp++;
+ x2 = *Xp;
+ x1 *= ((1<<Np)-iconst);
+ x2 *= iconst;
+ v = x1 + x2;
+ *Y++ = WordToHword(v,Np); /* Deposit output */
+ *Time += dtb; /* Move to next sample by time increment */
+ }
+ return (Y - Ystart); /* Return number of output samples */
+}
+
+/* Sampling rate up-conversion only subroutine;
+ * Slightly faster than down-conversion;
+ */
+STATIC int SrcUp(HWORD X[], HWORD Y[], double factor, UWORD *Time,
+ UHWORD Nx, UHWORD Nwing, UHWORD LpScl,
+ HWORD Imp[], HWORD ImpD[], BOOL Interp)
+{
+ HWORD *Xp, *Ystart;
+ WORD v;
+
+ double dt; /* Step through input signal */
+ UWORD dtb; /* Fixed-point version of Dt */
+ UWORD endTime; /* When Time reaches EndTime, return to user */
+
+ dt = 1.0/factor; /* Output sampling period */
+ dtb = dt*(1<<Np) + 0.5; /* Fixed-point representation */
+
+ Ystart = Y;
+ endTime = *Time + (1<<Np)*(WORD)Nx;
+ while (*Time < endTime)
+ {
+ Xp = &X[*Time>>Np]; /* Ptr to current input sample */
+ /* Perform left-wing inner product */
+ v = FilterUp(Imp, ImpD, Nwing, Interp, Xp, (HWORD)(*Time&Pmask),-1);
+ /* Perform right-wing inner product */
+ v += FilterUp(Imp, ImpD, Nwing, Interp, Xp+1,
+ /* previous (triggers warning): (HWORD)((-*Time)&Pmask),1); */
+ (HWORD)((((*Time)^Pmask)+1)&Pmask),1);
+ v >>= Nhg; /* Make guard bits */
+ v *= LpScl; /* Normalize for unity filter gain */
+ *Y++ = WordToHword(v,NLpScl); /* strip guard bits, deposit output */
+ *Time += dtb; /* Move to next sample by time increment */
+ }
+ return (Y - Ystart); /* Return the number of output samples */
+}
+
+
+/* Sampling rate conversion subroutine */
+
+STATIC int SrcUD(HWORD X[], HWORD Y[], double factor, UWORD *Time,
+ UHWORD Nx, UHWORD Nwing, UHWORD LpScl,
+ HWORD Imp[], HWORD ImpD[], BOOL Interp)
+{
+ HWORD *Xp, *Ystart;
+ WORD v;
+
+ double dh; /* Step through filter impulse response */
+ double dt; /* Step through input signal */
+ UWORD endTime; /* When Time reaches EndTime, return to user */
+ UWORD dhb, dtb; /* Fixed-point versions of Dh,Dt */
+
+ dt = 1.0/factor; /* Output sampling period */
+ dtb = dt*(1<<Np) + 0.5; /* Fixed-point representation */
+
+ dh = MIN(Npc, factor*Npc); /* Filter sampling period */
+ dhb = dh*(1<<Na) + 0.5; /* Fixed-point representation */
+
+ Ystart = Y;
+ endTime = *Time + (1<<Np)*(WORD)Nx;
+ while (*Time < endTime)
+ {
+ Xp = &X[*Time>>Np]; /* Ptr to current input sample */
+ v = FilterUD(Imp, ImpD, Nwing, Interp, Xp, (HWORD)(*Time&Pmask),
+ -1, dhb); /* Perform left-wing inner product */
+ v += FilterUD(Imp, ImpD, Nwing, Interp, Xp+1,
+ /* previous (triggers warning): (HWORD)((-*Time)&Pmask), */
+ (HWORD)((((*Time)^Pmask)+1)&Pmask),
+ 1, dhb); /* Perform right-wing inner product */
+ v >>= Nhg; /* Make guard bits */
+ v *= LpScl; /* Normalize for unity filter gain */
+ *Y++ = WordToHword(v,NLpScl); /* strip guard bits, deposit output */
+ *Time += dtb; /* Move to next sample by time increment */
+ }
+ return (Y - Ystart); /* Return the number of output samples */
+}
+
+#ifndef WITH_PJ
+static int err_ret(char *s)
+{
+ fprintf(stderr,"resample: %s \n\n",s); /* Display error message */
+ return -1;
+}
+
+static int resampleFast( /* number of output samples returned */
+ double factor, /* factor = Sndout/Sndin */
+ int infd, /* input and output file descriptors */
+ int outfd,
+ int inCount, /* number of input samples to convert */
+ int outCount, /* number of output samples to compute */
+ int nChans) /* number of sound channels (1 or 2) */
+{
+ UWORD Time, Time2; /* Current time/pos in input sample */
+ UHWORD Xp, Ncreep, Xoff, Xread;
+ int OBUFFSIZE = (int)(((double)IBUFFSIZE)*factor+2.0);
+ HWORD X1[IBUFFSIZE], Y1[2]; /* I/O buffers */
+ HWORD X2[IBUFFSIZE], Y2[OBUFFSIZE]; /* I/O buffers */
+ UHWORD Nout, Nx;
+ int i, Ycount, last;
+
+ mus_sample_t **obufs = sndlib_allocate_buffers(nChans, OBUFFSIZE);
+ if (obufs == NULL)
+ return err_ret("Can't allocate output buffers");
+
+ Xoff = 10;
+
+ Nx = IBUFFSIZE - 2*Xoff; /* # of samples to process each iteration */
+ last = 0; /* Have not read last input sample yet */
+ Ycount = 0; /* Current sample and length of output file */
+
+ Xp = Xoff; /* Current "now"-sample pointer for input */
+ Xread = Xoff; /* Position in input array to read into */
+ Time = (Xoff<<Np); /* Current-time pointer for converter */
+
+ for (i=0; i<Xoff; X1[i++]=0); /* Need Xoff zeros at begining of sample */
+ for (i=0; i<Xoff; X2[i++]=0); /* Need Xoff zeros at begining of sample */
+
+ do {
+ if (!last) /* If haven't read last sample yet */
+ {
+ last = readData(infd, inCount, X1, X2, IBUFFSIZE,
+ nChans, (int)Xread);
+ if (last && (last-Xoff<Nx)) { /* If last sample has been read... */
+ Nx = last-Xoff; /* ...calc last sample affected by filter */
+ if (Nx <= 0)
+ break;
+ }
+ }
+
+ /* Resample stuff in input buffer */
+ Time2 = Time;
+ Nout=SrcLinear(X1,Y1,factor,&Time,Nx);
+ if (nChans==2)
+ Nout=SrcLinear(X2,Y2,factor,&Time2,Nx);
+
+ Time -= (Nx<<Np); /* Move converter Nx samples back in time */
+ Xp += Nx; /* Advance by number of samples processed */
+ Ncreep = (Time>>Np) - Xoff; /* Calc time accumulation in Time */
+ if (Ncreep) {
+ Time -= (Ncreep<<Np); /* Remove time accumulation */
+ Xp += Ncreep; /* and add it to read pointer */
+ }
+ for (i=0; i<IBUFFSIZE-Xp+Xoff; i++) { /* Copy part of input signal */
+ X1[i] = X1[i+Xp-Xoff]; /* that must be re-used */
+ if (nChans==2)
+ X2[i] = X2[i+Xp-Xoff]; /* that must be re-used */
+ }
+ if (last) { /* If near end of sample... */
+ last -= Xp; /* ...keep track were it ends */
+ if (!last) /* Lengthen input by 1 sample if... */
+ last++; /* ...needed to keep flag TRUE */
+ }
+ Xread = i; /* Pos in input buff to read new data into */
+ Xp = Xoff;
+
+ Ycount += Nout;
+ if (Ycount>outCount) {
+ Nout -= (Ycount-outCount);
+ Ycount = outCount;
+ }
+
+ if (Nout > OBUFFSIZE) /* Check to see if output buff overflowed */
+ return err_ret("Output array overflow");
+
+ if (nChans==1) {
+ for (i = 0; i < Nout; i++)
+ obufs[0][i] = HWORD_TO_MUS_SAMPLE_TYPE(Y1[i]);
+ } else {
+ for (i = 0; i < Nout; i++) {
+ obufs[0][i] = HWORD_TO_MUS_SAMPLE_TYPE(Y1[i]);
+ obufs[1][i] = HWORD_TO_MUS_SAMPLE_TYPE(Y2[i]);
+ }
+ }
+ /* NB: errors reported within sndlib */
+ mus_file_write(outfd, 0, Nout - 1, nChans, obufs);
+
+ printf("."); fflush(stdout);
+
+ } while (Ycount<outCount); /* Continue until done */
+
+ return(Ycount); /* Return # of samples in output file */
+}
+
+
+static int resampleWithFilter( /* number of output samples returned */
+ double factor, /* factor = outSampleRate/inSampleRate */
+ int infd, /* input and output file descriptors */
+ int outfd,
+ int inCount, /* number of input samples to convert */
+ int outCount, /* number of output samples to compute */
+ int nChans, /* number of sound channels (1 or 2) */
+ BOOL interpFilt, /* TRUE means interpolate filter coeffs */
+ HWORD Imp[], HWORD ImpD[],
+ UHWORD LpScl, UHWORD Nmult, UHWORD Nwing)
+{
+ UWORD Time, Time2; /* Current time/pos in input sample */
+ UHWORD Xp, Ncreep, Xoff, Xread;
+ int OBUFFSIZE = (int)(((double)IBUFFSIZE)*factor+2.0);
+ HWORD X1[IBUFFSIZE], Y1[OBUFFSIZE]; /* I/O buffers */
+ HWORD X2[IBUFFSIZE], Y2[OBUFFSIZE]; /* I/O buffers */
+ UHWORD Nout, Nx;
+ int i, Ycount, last;
+
+ mus_sample_t **obufs = sndlib_allocate_buffers(nChans, OBUFFSIZE);
+ if (obufs == NULL)
+ return err_ret("Can't allocate output buffers");
+
+ /* Account for increased filter gain when using factors less than 1 */
+ if (factor < 1)
+ LpScl = LpScl*factor + 0.5;
+
+ /* Calc reach of LP filter wing & give some creeping room */
+ Xoff = ((Nmult+1)/2.0) * MAX(1.0,1.0/factor) + 10;
+
+ if (IBUFFSIZE < 2*Xoff) /* Check input buffer size */
+ return err_ret("IBUFFSIZE (or factor) is too small");
+
+ Nx = IBUFFSIZE - 2*Xoff; /* # of samples to process each iteration */
+
+ last = 0; /* Have not read last input sample yet */
+ Ycount = 0; /* Current sample and length of output file */
+ Xp = Xoff; /* Current "now"-sample pointer for input */
+ Xread = Xoff; /* Position in input array to read into */
+ Time = (Xoff<<Np); /* Current-time pointer for converter */
+
+ for (i=0; i<Xoff; X1[i++]=0); /* Need Xoff zeros at begining of sample */
+ for (i=0; i<Xoff; X2[i++]=0); /* Need Xoff zeros at begining of sample */
+
+ do {
+ if (!last) /* If haven't read last sample yet */
+ {
+ last = readData(infd, inCount, X1, X2, IBUFFSIZE,
+ nChans, (int)Xread);
+ if (last && (last-Xoff<Nx)) { /* If last sample has been read... */
+ Nx = last-Xoff; /* ...calc last sample affected by filter */
+ if (Nx <= 0)
+ break;
+ }
+ }
+ /* Resample stuff in input buffer */
+ Time2 = Time;
+ if (factor >= 1) { /* SrcUp() is faster if we can use it */
+ Nout=SrcUp(X1,Y1,factor,&Time,Nx,Nwing,LpScl,Imp,ImpD,interpFilt);
+ if (nChans==2)
+ Nout=SrcUp(X2,Y2,factor,&Time2,Nx,Nwing,LpScl,Imp,ImpD,
+ interpFilt);
+ }
+ else {
+ Nout=SrcUD(X1,Y1,factor,&Time,Nx,Nwing,LpScl,Imp,ImpD,interpFilt);
+ if (nChans==2)
+ Nout=SrcUD(X2,Y2,factor,&Time2,Nx,Nwing,LpScl,Imp,ImpD,
+ interpFilt);
+ }
+
+ Time -= (Nx<<Np); /* Move converter Nx samples back in time */
+ Xp += Nx; /* Advance by number of samples processed */
+ Ncreep = (Time>>Np) - Xoff; /* Calc time accumulation in Time */
+ if (Ncreep) {
+ Time -= (Ncreep<<Np); /* Remove time accumulation */
+ Xp += Ncreep; /* and add it to read pointer */
+ }
+ for (i=0; i<IBUFFSIZE-Xp+Xoff; i++) { /* Copy part of input signal */
+ X1[i] = X1[i+Xp-Xoff]; /* that must be re-used */
+ if (nChans==2)
+ X2[i] = X2[i+Xp-Xoff]; /* that must be re-used */
+ }
+ if (last) { /* If near end of sample... */
+ last -= Xp; /* ...keep track were it ends */
+ if (!last) /* Lengthen input by 1 sample if... */
+ last++; /* ...needed to keep flag TRUE */
+ }
+ Xread = i; /* Pos in input buff to read new data into */
+ Xp = Xoff;
+
+ Ycount += Nout;
+ if (Ycount>outCount) {
+ Nout -= (Ycount-outCount);
+ Ycount = outCount;
+ }
+
+ if (Nout > OBUFFSIZE) /* Check to see if output buff overflowed */
+ return err_ret("Output array overflow");
+
+ if (nChans==1) {
+ for (i = 0; i < Nout; i++)
+ obufs[0][i] = HWORD_TO_MUS_SAMPLE_TYPE(Y1[i]);
+ } else {
+ for (i = 0; i < Nout; i++) {
+ obufs[0][i] = HWORD_TO_MUS_SAMPLE_TYPE(Y1[i]);
+ obufs[1][i] = HWORD_TO_MUS_SAMPLE_TYPE(Y2[i]);
+ }
+ }
+ /* NB: errors reported within sndlib */
+ mus_file_write(outfd, 0, Nout - 1, nChans, obufs);
+
+ printf("."); fflush(stdout);
+
+ } while (Ycount<outCount); /* Continue until done */
+
+ return(Ycount); /* Return # of samples in output file */
+}
+
+
+int resample( /* number of output samples returned */
+ double factor, /* factor = Sndout/Sndin */
+ int infd, /* input and output file descriptors */
+ int outfd,
+ int inCount, /* number of input samples to convert */
+ int outCount, /* number of output samples to compute */
+ int nChans, /* number of sound channels (1 or 2) */
+ BOOL interpFilt, /* TRUE means interpolate filter coeffs */
+ int fastMode, /* 0 = highest quality, slowest speed */
+ BOOL largeFilter, /* TRUE means use 65-tap FIR filter */
+ char *filterFile) /* NULL for internal filter, else filename */
+{
+ UHWORD LpScl; /* Unity-gain scale factor */
+ UHWORD Nwing; /* Filter table size */
+ UHWORD Nmult; /* Filter length for up-conversions */
+ HWORD *Imp=0; /* Filter coefficients */
+ HWORD *ImpD=0; /* ImpD[n] = Imp[n+1]-Imp[n] */
+
+ if (fastMode)
+ return resampleFast(factor,infd,outfd,inCount,outCount,nChans);
+
+#ifdef DEBUG
+ /* Check for illegal constants */
+ if (Np >= 16)
+ return err_ret("Error: Np>=16");
+ if (Nb+Nhg+NLpScl >= 32)
+ return err_ret("Error: Nb+Nhg+NLpScl>=32");
+ if (Nh+Nb > 32)
+ return err_ret("Error: Nh+Nb>32");
+#endif
+
+ /* Set defaults */
+
+ if (filterFile != NULL && *filterFile != '\0') {
+ if (readFilter(filterFile, &Imp, &ImpD, &LpScl, &Nmult, &Nwing))
+ return err_ret("could not find filter file, "
+ "or syntax error in contents of filter file");
+ } else if (largeFilter) {
+ Nmult = LARGE_FILTER_NMULT;
+ Imp = LARGE_FILTER_IMP; /* Impulse response */
+ ImpD = LARGE_FILTER_IMPD; /* Impulse response deltas */
+ LpScl = LARGE_FILTER_SCALE; /* Unity-gain scale factor */
+ Nwing = LARGE_FILTER_NWING; /* Filter table length */
+ } else {
+ Nmult = SMALL_FILTER_NMULT;
+ Imp = SMALL_FILTER_IMP; /* Impulse response */
+ ImpD = SMALL_FILTER_IMPD; /* Impulse response deltas */
+ LpScl = SMALL_FILTER_SCALE; /* Unity-gain scale factor */
+ Nwing = SMALL_FILTER_NWING; /* Filter table length */
+ }
+#if DEBUG
+ fprintf(stderr,"Attenuating resampler scale factor by 0.95 "
+ "to reduce probability of clipping\n");
+#endif
+ LpScl *= 0.95;
+ return resampleWithFilter(factor,infd,outfd,inCount,outCount,nChans,
+ interpFilt, Imp, ImpD, LpScl, Nmult, Nwing);
+}
+#endif /* WITH_PJ */
+
diff --git a/third_party/resample/src/smallfilter.h b/third_party/resample/src/smallfilter.h
new file mode 100644
index 00000000..6f6f0f84
--- /dev/null
+++ b/third_party/resample/src/smallfilter.h
@@ -0,0 +1,4617 @@
+/* Included by resamplesubs.c */
+#define SMALL_FILTER_NMULT ((HWORD)13)
+#define SMALL_FILTER_SCALE 13128 /* Unity-gain scale factor */
+#define SMALL_FILTER_NWING 1536 /* Filter table length */
+static HWORD SMALL_FILTER_IMP[] /* Impulse response */ = {
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+-1,
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+0,
+0,
+0,
+0,
+0,
+1
+};
diff --git a/third_party/resample/src/sndlibextra.c b/third_party/resample/src/sndlibextra.c
new file mode 100644
index 00000000..c756cb10
--- /dev/null
+++ b/third_party/resample/src/sndlibextra.c
@@ -0,0 +1,90 @@
+/* sndlibextra.c
+
+ An interface to the low-level sndlib functions contained in sndlib/headers.c
+ and sndlib/io.c, designed for use by the resample program.
+ (sndlibextra.c is a stripped-down version of sndlibsupport.c in RTcmix.)
+
+ - John Gibson (jgg9c@virginia.edu)
+*/
+#include <assert.h>
+#include <string.h>
+#include "sndlibextra.h"
+
+/* #define NDEBUG */ /* define to disable asserts */
+
+/* ---------------------------------------------------- sndlib_create --- */
+/* Creates a new file and writes a header with the given characteristics.
+ <type> is a sndlib constant for header type (e.g. MUS_AIFF).
+ <format> is a sndlib constant for sound data format (e.g. snd_16_linear).
+ (These constants are defined in sndlib.h.) Caller is responsible for
+ checking that the header type and data format are compatible, and that
+ the header type is one that sndlib can write (is WRITEABLE_HEADER_TYPE()).
+ Writes no comment.
+
+ NOTE: This will truncate an existing file with <sfname>, so check first!
+
+ On success, returns a standard file descriptor, and leaves the file
+ position pointer at the end of the header.
+ On failure, returns -1. Caller can check errno then.
+*/
+int
+sndlib_create(char *sfname, /* file name */
+ int type, /* file type, e.g. AIFF */
+ int format, /* data format, e.g., MU-LAW */
+ int srate, /* sampling rate in Hz */
+ int chans, /* 1 for mono, 2 for stereo */
+ char *comment)
+{
+ int fd, loc;
+ assert(sfname != NULL && strlen(sfname) <= FILENAME_MAX);
+ mus_header_initialize(); // make sure relevant parts of sndlib are initialized
+ //resample-1.8: sndlib_write_header(fd, 0, type, format, srate, chans, comment, &loc)
+ //resample-1.8: mus_file_open_descriptors(fd, format, mus_header_data_format_to_bytes_per_sample(),loc);
+ // int mus_file_open_descriptors(int tfd, const char *arg, int df, int ds, off_t dl, int dc, int dt);
+ fd = mus_sound_open_output(sfname, srate, chans, format, type, "created by resample");
+ return fd;
+}
+
+/* ------------------------------------------ sndlib_allocate_buffers --- */
+/* Allocate the multi-dimensional array required by sndlib I/O functions.
+ Returns an array of <nchans> arrays of <nframes> integers. The memory
+ is cleared. If the return value is NULL, check errno.
+*/
+int **
+sndlib_allocate_buffers(int nchans, int nframes)
+{
+ int **bufs, n;
+
+ assert(nchans > 0 && nframes > 0);
+
+ bufs = (int **)calloc(nchans, sizeof(int *));
+ if (bufs == NULL)
+ return NULL;
+
+ for (n = 0; n < nchans; n++) {
+ bufs[n] = (int *)calloc(nframes, sizeof(int));
+ if (bufs[n] == NULL) {
+ sndlib_free_buffers(bufs, nchans);
+ return NULL;
+ }
+ }
+
+ return bufs;
+}
+
+
+/* ---------------------------------------------- sndlib_free_buffers --- */
+/* Free the multi-dimensional array <bufs> with <nchans> elements.
+*/
+void
+sndlib_free_buffers(int **bufs, int nchans)
+{
+ int n;
+
+ assert(bufs != NULL);
+
+ for (n = 0; n < nchans; n++)
+ if (bufs[n])
+ free(bufs[n]);
+ free(bufs);
+}
diff --git a/third_party/resample/src/sndlibextra.h b/third_party/resample/src/sndlibextra.h
new file mode 100644
index 00000000..536ac72c
--- /dev/null
+++ b/third_party/resample/src/sndlibextra.h
@@ -0,0 +1,48 @@
+#include <endian.h> /* so that sndlib.h will get host byte-order right */
+#include <sndlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+/* for creating, opening and closing files for sndlib I/O */
+int sndlib_create(char *, int, int, int, int, char *);
+int sndlib_open_read(char *);
+int sndlib_open_write(char *);
+int sndlib_close(int, int, int, int, int);
+
+/* for reading and writing headers */
+int sndlib_read_header(int);
+int sndlib_write_header(int, int, int, int, int, int, char *, int *);
+int sndlib_set_header_data_size(int, int, int);
+
+/* helper functions */
+int **sndlib_allocate_buffers(int, int);
+void sndlib_free_buffers(int **, int);
+
+
+/* some handy macros */
+
+#define IS_FLOAT_FORMAT(format) ( \
+ (format) == snd_32_float \
+ || (format) == snd_32_float_little_endian )
+
+#define NOT_A_SOUND_FILE(header_type) ( \
+ (header_type) == MUS_UNSUPPORTED \
+ || (header_type) == MUS_RAW )
+
+/* The header types that sndlib can write, as of sndlib-5.5. */
+#define WRITEABLE_HEADER_TYPE(type) ( \
+ (type) == MUS_AIFF \
+ || (type) == MUS_NEXT \
+ || (type) == MUS_RIFF \
+ || (type) == MUS_IRCAM )
+
+#define INVALID_DATA_FORMAT(format) ((format) < 1)
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif /* __cplusplus */
+
diff --git a/third_party/resample/src/stdefs.h b/third_party/resample/src/stdefs.h
new file mode 100644
index 00000000..4672981b
--- /dev/null
+++ b/third_party/resample/src/stdefs.h
@@ -0,0 +1,59 @@
+/* stdefs.h */
+#ifndef _STDEFS_H
+#define _STDEFS_H
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef PI
+#define PI (3.14159265358979232846)
+#endif
+
+#ifndef PI2
+#define PI2 (6.28318530717958465692)
+#endif
+
+#define D2R (0.01745329348) /* (2*pi)/360 */
+#define R2D (57.29577951) /* 360/(2*pi) */
+
+#ifndef MAX
+#define MAX(x,y) ((x)>(y) ?(x):(y))
+#endif
+#ifndef MIN
+#define MIN(x,y) ((x)<(y) ?(x):(y))
+#endif
+
+#ifndef ABS
+#define ABS(x) ((x)<0 ?(-(x)):(x))
+#endif
+
+#ifndef SGN
+#define SGN(x) ((x)<0 ?(-1):((x)==0?(0):(1)))
+#endif
+
+typedef char BOOL;
+typedef short HWORD;
+typedef unsigned short UHWORD;
+typedef int WORD;
+typedef unsigned int UWORD;
+
+#define MUS_SAMPLE_TYPE_TO_HWORD(x) ((HWORD)((x)>>(MUS_SAMPLE_BITS-16)))
+#define HWORD_TO_MUS_SAMPLE_TYPE(x) ((mus_sample_t)((x)<<(MUS_SAMPLE_BITS-16)))
+
+#define MAX_HWORD (32767)
+#define MIN_HWORD (-32768)
+
+#ifdef DEBUG
+#define INLINE
+#else
+#ifndef INLINE
+#define INLINE inline
+#endif
+#endif
+
+#endif /* _STDEFS_H */
diff --git a/third_party/resample/src/windowfilter.c b/third_party/resample/src/windowfilter.c
new file mode 100644
index 00000000..b2b67690
--- /dev/null
+++ b/third_party/resample/src/windowfilter.c
@@ -0,0 +1,114 @@
+/* makefilter.c */
+
+#include <stdio.h>
+#include <math.h>
+#include "stdefs.h"
+#include "filterkit.h"
+#include "resample.h"
+#define MAXNWING 8192 /* FIXME: flush */
+
+/* LIBRARIES needed:
+ *
+ * 1. filterkit
+ * makeFilter() - designs a Kaiser-windowed low-pass filter
+ * writeFilter() - writes a filter to a standard filter file
+ * GetUShort() - prompt user for a UHWORD with help
+ * GetDouble() - prompt user for a double with help
+ *
+ * 2. math
+ */
+
+char NmultHelp[] =
+ "\n Nmult is the length of the symmetric FIR lowpass filter used"
+ "\n by the sampling rate converter. It must be odd."
+ "\n This is the number of multiplies per output sample for"
+ "\n up-conversions (Factor>1), and is the number of multiplies"
+ "\n per input sample for down-conversions (Factor<1). Thus if"
+ "\n the rate conversion is Srate2 = Factor*Srate1, then you have"
+ "\n Nmult*Srate1*MAXof(Factor,1) multiplies per second of real time."
+ "\n Naturally, higher Nmult gives better lowpass-filtering at the"
+ "\n expense of longer compute times. Nmult should be odd because"
+ "\n it is the length of a symmetric FIR filter, and the current"
+ "\n implementation requires a coefficient at the time origin.\n";
+
+char FrollHelp[] =
+ "\n Froll determines the frequency at which the lowpass filter begins to"
+ "\n roll-off. If Froll=1, then there is no 'guard zone' and the filter"
+ "\n roll-off region will be aliased. If Froll is 0.90, for example, then"
+ "\n the filter begins rolling off at 0.90*Srate/2, so that by Srate/2,"
+ "\n the filter is well down and aliasing is reduced. Since aliasing"
+ "\n distortion is typically worse than loss of the high-frequency spectral"
+ "\n amplitude, Froll<1 is highly recommended. The default of 0.90"
+ "\n sacrifices the upper 10 percent of the spectrum as an anti-aliasing"
+ "\n guard zone.\n";
+
+char BetaHelp[] =
+ "\n Beta trades the rejection of the lowpass filter against the"
+ "\n transition width from passband to stopband. Larger Beta means"
+ "\n a slower transition and greater stopband rejection. See Rabiner"
+ "\n and Gold (Th. and App. of DSP) under Kaiser windows for more about"
+ "\n Beta. The following table from Rabiner and Gold (p. 101) gives some"
+ "\n feel for the effect of Beta:"
+ "\n"
+ "\n BETA D PB RIP SB RIP"
+ "\n 2.120 1.50 +-0.27 -30"
+ "\n 3.384 2.23 0.0864 -40"
+ "\n 4.538 2.93 0.0274 -50"
+ "\n 5.658 3.62 0.00868 -60"
+ "\n 6.764 4.32 0.00275 -70"
+ "\n 7.865 5.0 0.000868 -80"
+ "\n 8.960 5.7 0.000275 -90"
+ "\n 10.056 6.4 0.000087 -100"
+ "\n"
+ "\n Above, ripples are in dB, and the transition band width is "
+ "\n approximately D*Fs/N, where Fs = sampling rate, "
+ "\n and N = window length. PB = 'pass band' and SB = 'stop band'."
+ "\n Alternatively, D is the transition widths in bins given a"
+ "\n length N DFT (i.e. a window transform with no zero padding."
+ "\n";
+
+
+int main(void)
+{
+ HWORD Imp[MAXNWING]; /* Filter coefficients */
+ HWORD ImpD[MAXNWING]; /* ImpD[i] = ImpD[i+1] - ImpD[i] */
+ double Froll, Beta;
+ UHWORD Nmult, Nwing, LpScl;
+ int err;
+
+ Froll = 0.90;
+ Beta = 9;
+ Nmult = 65;
+ while (1)
+ {
+ Froll = GetDouble("Normalized Roll-off freq (0<Froll<=1)",
+ Froll, FrollHelp);
+ Beta = GetDouble("Beta", Beta, BetaHelp);
+ Nmult = GetUHWORD("Odd filter length 'Nmult'", Nmult, NmultHelp);
+ if ((Nmult&1) == 0) {
+ Nmult++;
+ printf("Filter length increased to %d to make it odd.\n",Nmult);
+ }
+ Nwing = Npc*(Nmult-1)/2; /* # of filter coeffs in right wing */
+ printf("\n");
+ if (!(Nmult % 2))
+ printf("Error: Nmult must be odd and greater than zero\n");
+ else if ((err = makeFilter(Imp, ImpD, &LpScl, Nwing, Froll, Beta))) {
+ printf("*** Error: Unable to make filter.\n");
+ if (err == 1)
+ printf("\tNmult=%d too large for MAXNWING=%d\n",Nmult,MAXNWING);
+ else if (err == 2)
+ printf("\tNormalized roll-off freq Froll must be between 0 and 1\n");
+ else if (err == 3)
+ printf("\tHeisenberg says Beta must be greater or equal to 1\n");
+ else if (err == 4) {
+ printf("\tUnity-gain scale factor overflows 16-bit half-word\n");
+ printf("\tFilter design was probably way off. Try relaxing specs.\n");
+ }
+ } else if ((err = writeFilter(Imp, ImpD, LpScl, Nmult, Nwing)))
+ printf("Error: Unable to write filter, err=%d\n", err);
+ else
+ break;
+ }
+ return(0);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-30 22:34:53 +0000