This commit is contained in:
2020-08-10 22:23:49 +08:00
parent 6bb6777bb9
commit 19e730574b
265 changed files with 86326 additions and 952 deletions

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@@ -0,0 +1,759 @@
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#-------------------------------------------------------------------------------
# An extra check for bad asm.
check-asm : check_asm.sh src_sinc.s src_linear.s src_zoh.s
@echo
@echo
$(srcdir)/check_asm.sh src_sinc.s
$(srcdir)/check_asm.sh src_linear.s
$(srcdir)/check_asm.sh src_zoh.s
@echo
@echo
%.s : $(srcdir)/%.c
$(CC) -S $(CFLAGS) $(DEFAULT_INCLUDES) $(srcdir)/$+ -o $@
# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:

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#
# Export file for libsamplerate
#
# Only the symbols listed in the global section will be callable from
# applications linking to libsamplerate.
#
libsamplerate.so.0.0
{
global:
src_new ;
src_delete ;
src_get_name ;
src_get_description ;
src_get_version ;
src_process ;
src_reset ;
src_error ;
src_strerror ;
src_simple ;
src_is_valid_ratio ;
src_set_ratio ;
local:
*;
};
libsamplerate.so.0.1
{
global:
src_callback_new ;
src_callback_read ;
src_short_to_float_array ;
src_float_to_short_array ;
src_int_to_float_array ;
src_float_to_int_array ;
src_get_channels ;
} libsamplerate.so.0.0;

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#
# Export file for libsamplerate
#
# Only the symbols listed in the global section will be callable from
# applications linking to libsamplerate.
#
@PACKAGE@.so.0.0
{
global:
src_new ;
src_delete ;
src_get_name ;
src_get_description ;
src_get_version ;
src_process ;
src_reset ;
src_error ;
src_strerror ;
src_simple ;
src_is_valid_ratio ;
src_set_ratio ;
local:
*;
};
@PACKAGE@.so.0.1
{
global:
src_callback_new ;
src_callback_read ;
src_short_to_float_array ;
src_float_to_short_array ;
src_int_to_float_array ;
src_float_to_int_array ;
src_get_channels ;
} @PACKAGE@.so.0.0;

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#!/bin/sh
# Copyright (C) 2004-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#=======================================================================
# This short test script compiles the file src_sinc.c into assembler
# output and the greps the assembler output for the fldcw (FPU Load
# Control Word) instruction which is very detrimental to the perfromance
# of floating point code.
echo -n " Checking assembler output for bad code : "
if [ $# -ne 1 ]; then
echo "Error : Need the name of the input file."
exit 1
fi
filename=$1
if [ ! -f $filename ];then
echo "Error : Can't find file $filename."
exit 1
fi
count=`grep fldcw $filename | wc -l`
if [ $count -gt 0 ]; then
echo -e "\n\nError : found $count bad instructions.\n\n"
exit 1
fi
echo "ok"

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/*
** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
*/
#ifndef COMMON_H_INCLUDED
#define COMMON_H_INCLUDED
#ifdef HAVE_STDINT_H
#include <stdint.h>
#elif (SIZEOF_INT == 4)
typedef int int32_t ;
#elif (SIZEOF_LONG == 4)
typedef long int32_t ;
#endif
#define SRC_MAX_RATIO 256
#define SRC_MAX_RATIO_STR "256"
#define SRC_MIN_RATIO_DIFF (1e-20)
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#define ARRAY_LEN(x) ((int) (sizeof (x) / sizeof ((x) [0])))
#define OFFSETOF(type,member) ((int) (&((type*) 0)->member))
#define MAKE_MAGIC(a,b,c,d,e,f) ((a) + ((b) << 4) + ((c) << 8) + ((d) << 12) + ((e) << 16) + ((f) << 20))
/*
** Inspiration : http://sourcefrog.net/weblog/software/languages/C/unused.html
*/
#ifdef UNUSED
#elif defined (__GNUC__)
# define UNUSED(x) UNUSED_ ## x __attribute__ ((unused))
#elif defined (__LCLINT__)
# define UNUSED(x) /*@unused@*/ x
#else
# define UNUSED(x) x
#endif
#ifdef __GNUC__
# define WARN_UNUSED __attribute__ ((warn_unused_result))
#else
# define WARN_UNUSED
#endif
#include "samplerate.h"
enum
{ SRC_FALSE = 0,
SRC_TRUE = 1,
SRC_MODE_PROCESS = 555,
SRC_MODE_CALLBACK = 556
} ;
enum
{ SRC_ERR_NO_ERROR = 0,
SRC_ERR_MALLOC_FAILED,
SRC_ERR_BAD_STATE,
SRC_ERR_BAD_DATA,
SRC_ERR_BAD_DATA_PTR,
SRC_ERR_NO_PRIVATE,
SRC_ERR_BAD_SRC_RATIO,
SRC_ERR_BAD_PROC_PTR,
SRC_ERR_SHIFT_BITS,
SRC_ERR_FILTER_LEN,
SRC_ERR_BAD_CONVERTER,
SRC_ERR_BAD_CHANNEL_COUNT,
SRC_ERR_SINC_BAD_BUFFER_LEN,
SRC_ERR_SIZE_INCOMPATIBILITY,
SRC_ERR_BAD_PRIV_PTR,
SRC_ERR_BAD_SINC_STATE,
SRC_ERR_DATA_OVERLAP,
SRC_ERR_BAD_CALLBACK,
SRC_ERR_BAD_MODE,
SRC_ERR_NULL_CALLBACK,
SRC_ERR_NO_VARIABLE_RATIO,
SRC_ERR_SINC_PREPARE_DATA_BAD_LEN,
SRC_ERR_BAD_INTERNAL_STATE,
/* This must be the last error number. */
SRC_ERR_MAX_ERROR
} ;
typedef struct SRC_PRIVATE_tag
{ double last_ratio, last_position ;
int error ;
int channels ;
/* SRC_MODE_PROCESS or SRC_MODE_CALLBACK */
int mode ;
/* Pointer to data to converter specific data. */
void *private_data ;
/* Varispeed process function. */
int (*vari_process) (struct SRC_PRIVATE_tag *psrc, SRC_DATA *data) ;
/* Constant speed process function. */
int (*const_process) (struct SRC_PRIVATE_tag *psrc, SRC_DATA *data) ;
/* State reset. */
void (*reset) (struct SRC_PRIVATE_tag *psrc) ;
/* Data specific to SRC_MODE_CALLBACK. */
src_callback_t callback_func ;
void *user_callback_data ;
long saved_frames ;
const float *saved_data ;
} SRC_PRIVATE ;
/* In src_sinc.c */
const char* sinc_get_name (int src_enum) ;
const char* sinc_get_description (int src_enum) ;
int sinc_set_converter (SRC_PRIVATE *psrc, int src_enum) ;
/* In src_linear.c */
const char* linear_get_name (int src_enum) ;
const char* linear_get_description (int src_enum) ;
int linear_set_converter (SRC_PRIVATE *psrc, int src_enum) ;
/* In src_zoh.c */
const char* zoh_get_name (int src_enum) ;
const char* zoh_get_description (int src_enum) ;
int zoh_set_converter (SRC_PRIVATE *psrc, int src_enum) ;
/*----------------------------------------------------------
** Common static inline functions.
*/
static inline double
fmod_one (double x)
{ double res ;
res = x - lrint (x) ;
if (res < 0.0)
return res + 1.0 ;
return res ;
} /* fmod_one */
static inline int
is_bad_src_ratio (double ratio)
{ return (ratio < (1.0 / SRC_MAX_RATIO) || ratio > (1.0 * SRC_MAX_RATIO)) ;
} /* is_bad_src_ratio */
#endif /* COMMON_H_INCLUDED */

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/* src/config.h. Generated from config.h.in by configure. */
/* src/config.h.in. Generated from configure.ac by autoheader. */
/* Set to 1 if the compile is GNU GCC. */
#define COMPILER_IS_GCC 1
/* Target processor clips on negative float to int conversion. */
#define CPU_CLIPS_NEGATIVE 0
/* Target processor clips on positive float to int conversion. */
#define CPU_CLIPS_POSITIVE 0
/* Target processor is big endian. */
#define CPU_IS_BIG_ENDIAN 0
/* Target processor is little endian. */
#define CPU_IS_LITTLE_ENDIAN 1
/* Major version of GCC or 3 otherwise. */
#define GCC_MAJOR_VERSION 4
/* Define to 1 if you have the `alarm' function. */
#define HAVE_ALARM 1
/* Define to 1 if you have the <alsa/asoundlib.h> header file. */
/* #undef HAVE_ALSA_ASOUNDLIB_H */
/* Define to 1 if you have the `calloc' function. */
#define HAVE_CALLOC 1
/* Define to 1 if you have the `ceil' function. */
#define HAVE_CEIL 1
/* Define to 1 if you have the <dlfcn.h> header file. */
#define HAVE_DLFCN_H 1
/* Set to 1 if you have libfftw3. */
#define HAVE_FFTW3 0
/* Define to 1 if you have the `floor' function. */
#define HAVE_FLOOR 1
/* Define to 1 if you have the `fmod' function. */
#define HAVE_FMOD 1
/* Define to 1 if you have the `free' function. */
#define HAVE_FREE 1
/* Define to 1 if you have the <inttypes.h> header file. */
#define HAVE_INTTYPES_H 1
/* Define to 1 if you have the `m' library (-lm). */
#define HAVE_LIBM 1
/* Define if you have C99's lrint function. */
#define HAVE_LRINT 1
/* Define if you have C99's lrintf function. */
#define HAVE_LRINTF 1
/* Define to 1 if you have the `malloc' function. */
#define HAVE_MALLOC 1
/* Define to 1 if you have the `memcpy' function. */
#define HAVE_MEMCPY 1
/* Define to 1 if you have the `memmove' function. */
#define HAVE_MEMMOVE 1
/* Define to 1 if you have the <memory.h> header file. */
#define HAVE_MEMORY_H 1
/* Define if you have signal SIGALRM. */
#define HAVE_SIGALRM 1
/* Define to 1 if you have the `signal' function. */
#define HAVE_SIGNAL 1
/* Set to 1 if you have libsndfile. */
#define HAVE_SNDFILE 1
/* Define to 1 if you have the <stdint.h> header file. */
#define HAVE_STDINT_H 1
/* Define to 1 if you have the <stdlib.h> header file. */
#define HAVE_STDLIB_H 1
/* Define to 1 if you have the <strings.h> header file. */
#define HAVE_STRINGS_H 1
/* Define to 1 if you have the <string.h> header file. */
#define HAVE_STRING_H 1
/* Define to 1 if you have the <sys/stat.h> header file. */
#define HAVE_SYS_STAT_H 1
/* Define to 1 if you have the <sys/times.h> header file. */
#define HAVE_SYS_TIMES_H 1
/* Define to 1 if you have the <sys/types.h> header file. */
#define HAVE_SYS_TYPES_H 1
/* Define to 1 if you have the <unistd.h> header file. */
#define HAVE_UNISTD_H 1
/* Define to the sub-directory where libtool stores uninstalled libraries. */
#define LT_OBJDIR ".libs/"
/* Set to 1 if compiling for Win32 */
#define OS_IS_WIN32 0
/* Name of package */
#define PACKAGE "libsamplerate"
/* Define to the address where bug reports for this package should be sent. */
#define PACKAGE_BUGREPORT "erikd@mega-nerd.com"
/* Define to the full name of this package. */
#define PACKAGE_NAME "libsamplerate"
/* Define to the full name and version of this package. */
#define PACKAGE_STRING "libsamplerate 0.1.9"
/* Define to the one symbol short name of this package. */
#define PACKAGE_TARNAME "libsamplerate"
/* Define to the home page for this package. */
#define PACKAGE_URL "http://www.mega-nerd.com/libsamplerate/"
/* Define to the version of this package. */
#define PACKAGE_VERSION "0.1.9"
/* The size of `double', as computed by sizeof. */
#define SIZEOF_DOUBLE 8
/* The size of `float', as computed by sizeof. */
#define SIZEOF_FLOAT 4
/* The size of `int', as computed by sizeof. */
#define SIZEOF_INT 4
/* The size of `long', as computed by sizeof. */
#define SIZEOF_LONG 8
/* Define to 1 if you have the ANSI C header files. */
#define STDC_HEADERS 1
/* Version number of package */
#define VERSION "0.1.9"

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@@ -0,0 +1,148 @@
/* src/config.h.in. Generated from configure.ac by autoheader. */
/* Set to 1 if the compile is GNU GCC. */
#undef COMPILER_IS_GCC
/* Target processor clips on negative float to int conversion. */
#undef CPU_CLIPS_NEGATIVE
/* Target processor clips on positive float to int conversion. */
#undef CPU_CLIPS_POSITIVE
/* Target processor is big endian. */
#undef CPU_IS_BIG_ENDIAN
/* Target processor is little endian. */
#undef CPU_IS_LITTLE_ENDIAN
/* Major version of GCC or 3 otherwise. */
#undef GCC_MAJOR_VERSION
/* Define to 1 if you have the `alarm' function. */
#undef HAVE_ALARM
/* Define to 1 if you have the <alsa/asoundlib.h> header file. */
#undef HAVE_ALSA_ASOUNDLIB_H
/* Define to 1 if you have the `calloc' function. */
#undef HAVE_CALLOC
/* Define to 1 if you have the `ceil' function. */
#undef HAVE_CEIL
/* Define to 1 if you have the <dlfcn.h> header file. */
#undef HAVE_DLFCN_H
/* Set to 1 if you have libfftw3. */
#undef HAVE_FFTW3
/* Define to 1 if you have the `floor' function. */
#undef HAVE_FLOOR
/* Define to 1 if you have the `fmod' function. */
#undef HAVE_FMOD
/* Define to 1 if you have the `free' function. */
#undef HAVE_FREE
/* Define to 1 if you have the <inttypes.h> header file. */
#undef HAVE_INTTYPES_H
/* Define to 1 if you have the `m' library (-lm). */
#undef HAVE_LIBM
/* Define if you have C99's lrint function. */
#undef HAVE_LRINT
/* Define if you have C99's lrintf function. */
#undef HAVE_LRINTF
/* Define to 1 if you have the `malloc' function. */
#undef HAVE_MALLOC
/* Define to 1 if you have the `memcpy' function. */
#undef HAVE_MEMCPY
/* Define to 1 if you have the `memmove' function. */
#undef HAVE_MEMMOVE
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* Define if you have signal SIGALRM. */
#undef HAVE_SIGALRM
/* Define to 1 if you have the `signal' function. */
#undef HAVE_SIGNAL
/* Set to 1 if you have libsndfile. */
#undef HAVE_SNDFILE
/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H
/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H
/* Define to 1 if you have the <strings.h> header file. */
#undef HAVE_STRINGS_H
/* Define to 1 if you have the <string.h> header file. */
#undef HAVE_STRING_H
/* Define to 1 if you have the <sys/stat.h> header file. */
#undef HAVE_SYS_STAT_H
/* Define to 1 if you have the <sys/times.h> header file. */
#undef HAVE_SYS_TIMES_H
/* Define to 1 if you have the <sys/types.h> header file. */
#undef HAVE_SYS_TYPES_H
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
/* Define to the sub-directory where libtool stores uninstalled libraries. */
#undef LT_OBJDIR
/* Set to 1 if compiling for Win32 */
#undef OS_IS_WIN32
/* Name of package */
#undef PACKAGE
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
/* Define to the full name of this package. */
#undef PACKAGE_NAME
/* Define to the full name and version of this package. */
#undef PACKAGE_STRING
/* Define to the one symbol short name of this package. */
#undef PACKAGE_TARNAME
/* Define to the home page for this package. */
#undef PACKAGE_URL
/* Define to the version of this package. */
#undef PACKAGE_VERSION
/* The size of `double', as computed by sizeof. */
#undef SIZEOF_DOUBLE
/* The size of `float', as computed by sizeof. */
#undef SIZEOF_FLOAT
/* The size of `int', as computed by sizeof. */
#undef SIZEOF_INT
/* The size of `long', as computed by sizeof. */
#undef SIZEOF_LONG
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* Version number of package */
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/*
** Copyright (c) 2001-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
*/
/* Version 1.5 */
#ifndef FLOAT_CAST_HEADER
#define FLOAT_CAST_HEADER
/*============================================================================
** On Intel Pentium processors (especially PIII and probably P4), converting
** from float to int is very slow. To meet the C specs, the code produced by
** most C compilers targeting Pentium needs to change the FPU rounding mode
** before the float to int conversion is performed.
**
** Changing the FPU rounding mode causes the FPU pipeline to be flushed. It
** is this flushing of the pipeline which is so slow.
**
** Fortunately the ISO C99 specifications define the functions lrint, lrintf,
** llrint and llrintf which fix this problem as a side effect.
**
** On Unix-like systems, the configure process should have detected the
** presence of these functions. If they weren't found we have to replace them
** here with a standard C cast.
*/
/*
** The C99 prototypes for lrint and lrintf are as follows:
**
** long int lrintf (float x) ;
** long int lrint (double x) ;
*/
#include "config.h"
/*
** The presence of the required functions are detected during the configure
** process and the values HAVE_LRINT and HAVE_LRINTF are set accordingly in
** the config.h file.
*/
#define HAVE_LRINT_REPLACEMENT 0
#if (HAVE_LRINT && HAVE_LRINTF)
/*
** These defines enable functionality introduced with the 1999 ISO C
** standard. They must be defined before the inclusion of math.h to
** engage them. If optimisation is enabled, these functions will be
** inlined. With optimisation switched off, you have to link in the
** maths library using -lm.
*/
#define _ISOC9X_SOURCE 1
#define _ISOC99_SOURCE 1
#define __USE_ISOC9X 1
#define __USE_ISOC99 1
#include <math.h>
#elif (defined (__CYGWIN__))
#include <math.h>
#undef HAVE_LRINT_REPLACEMENT
#define HAVE_LRINT_REPLACEMENT 1
#undef lrint
#undef lrintf
#define lrint double2int
#define lrintf float2int
/*
** The native CYGWIN lrint and lrintf functions are buggy:
** http://sourceware.org/ml/cygwin/2005-06/msg00153.html
** http://sourceware.org/ml/cygwin/2005-09/msg00047.html
** and slow.
** These functions (pulled from the Public Domain MinGW math.h header)
** replace the native versions.
*/
static inline long double2int (double in)
{ long retval ;
__asm__ __volatile__
( "fistpl %0"
: "=m" (retval)
: "t" (in)
: "st"
) ;
return retval ;
} /* double2int */
static inline long float2int (float in)
{ long retval ;
__asm__ __volatile__
( "fistpl %0"
: "=m" (retval)
: "t" (in)
: "st"
) ;
return retval ;
} /* float2int */
#elif (defined (WIN64) || defined(_WIN64))
/* Win64 section should be places before Win32 one, because
** most likely both WIN32 and WIN64 will be defined in 64-bit case.
*/
#include <math.h>
/* Win64 doesn't seem to have these functions, nor inline assembly.
** Therefore implement inline versions of these functions here.
*/
#include <emmintrin.h>
#include <mmintrin.h>
__inline long int
lrint(double flt)
{
return _mm_cvtsd_si32(_mm_load_sd(&flt));
}
__inline long int
lrintf(float flt)
{
return _mm_cvtss_si32(_mm_load_ss(&flt));
}
#elif (defined (WIN32) || defined (_WIN32))
#undef HAVE_LRINT_REPLACEMENT
#define HAVE_LRINT_REPLACEMENT 1
#include <math.h>
/*
** Win32 doesn't seem to have these functions.
** Therefore implement inline versions of these functions here.
*/
__inline long int
lrint (double flt)
{ int intgr ;
_asm
{ fld flt
fistp intgr
} ;
return intgr ;
}
__inline long int
lrintf (float flt)
{ int intgr ;
_asm
{ fld flt
fistp intgr
} ;
return intgr ;
}
#elif (defined (__MWERKS__) && defined (macintosh))
/* This MacOS 9 solution was provided by Stephane Letz */
#undef HAVE_LRINT_REPLACEMENT
#define HAVE_LRINT_REPLACEMENT 1
#include <math.h>
#undef lrint
#undef lrintf
#define lrint double2int
#define lrintf float2int
inline int
float2int (register float in)
{ long res [2] ;
asm
{ fctiw in, in
stfd in, res
}
return res [1] ;
} /* float2int */
inline int
double2int (register double in)
{ long res [2] ;
asm
{ fctiw in, in
stfd in, res
}
return res [1] ;
} /* double2int */
#elif (defined (__MACH__) && defined (__APPLE__))
/* For Apple MacOSX. */
#undef HAVE_LRINT_REPLACEMENT
#define HAVE_LRINT_REPLACEMENT 1
#include <math.h>
#undef lrint
#undef lrintf
#define lrint double2int
#define lrintf float2int
inline static long
float2int (register float in)
{ int res [2] ;
__asm__ __volatile__
( "fctiw %1, %1\n\t"
"stfd %1, %0"
: "=m" (res) /* Output */
: "f" (in) /* Input */
: "memory"
) ;
return res [1] ;
} /* lrintf */
inline static long
double2int (register double in)
{ int res [2] ;
__asm__ __volatile__
( "fctiw %1, %1\n\t"
"stfd %1, %0"
: "=m" (res) /* Output */
: "f" (in) /* Input */
: "memory"
) ;
return res [1] ;
} /* lrint */
#else
#ifndef __sgi
#warning "Don't have the functions lrint() and lrintf()."
#warning "Replacing these functions with a standard C cast."
#endif
#include <math.h>
#define lrint(dbl) ((long) (dbl))
#define lrintf(flt) ((long) (flt))
#endif
#endif /* FLOAT_CAST_HEADER */

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# libsamplerate.la - a libtool library file
# Generated by libtool (GNU libtool) 2.4.6 Debian-2.4.6-2
#
# Please DO NOT delete this file!
# It is necessary for linking the library.
# The name that we can dlopen(3).
dlname='libsamplerate.0.dylib'
# Names of this library.
library_names='libsamplerate.0.dylib libsamplerate.dylib'
# The name of the static archive.
old_library='libsamplerate.a'
# Linker flags that cannot go in dependency_libs.
inherited_linker_flags=' '
# Libraries that this one depends upon.
dependency_libs=' -lm'
# Names of additional weak libraries provided by this library
weak_library_names=''
# Version information for libsamplerate.
current=1
age=1
revision=8
# Is this an already installed library?
installed=no
# Should we warn about portability when linking against -modules?
shouldnotlink=no
# Files to dlopen/dlpreopen
dlopen=''
dlpreopen=''
# Directory that this library needs to be installed in:
libdir='/usr/local/lib'

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/*
** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "samplerate.h"
#include "float_cast.h"
#include "common.h"
static int psrc_set_converter (SRC_PRIVATE *psrc, int converter_type) ;
SRC_STATE *
src_new (int converter_type, int channels, int *error)
{ SRC_PRIVATE *psrc ;
if (error)
*error = SRC_ERR_NO_ERROR ;
if (channels < 1)
{ if (error)
*error = SRC_ERR_BAD_CHANNEL_COUNT ;
return NULL ;
} ;
if ((psrc = calloc (1, sizeof (*psrc))) == NULL)
{ if (error)
*error = SRC_ERR_MALLOC_FAILED ;
return NULL ;
} ;
psrc->channels = channels ;
psrc->mode = SRC_MODE_PROCESS ;
if (psrc_set_converter (psrc, converter_type) != SRC_ERR_NO_ERROR)
{ if (error)
*error = SRC_ERR_BAD_CONVERTER ;
free (psrc) ;
psrc = NULL ;
} ;
src_reset ((SRC_STATE*) psrc) ;
return (SRC_STATE*) psrc ;
} /* src_new */
SRC_STATE*
src_callback_new (src_callback_t func, int converter_type, int channels, int *error, void* cb_data)
{ SRC_STATE *src_state ;
if (func == NULL)
{ if (error)
*error = SRC_ERR_BAD_CALLBACK ;
return NULL ;
} ;
if (error != NULL)
*error = 0 ;
if ((src_state = src_new (converter_type, channels, error)) == NULL)
return NULL ;
src_reset (src_state) ;
((SRC_PRIVATE*) src_state)->mode = SRC_MODE_CALLBACK ;
((SRC_PRIVATE*) src_state)->callback_func = func ;
((SRC_PRIVATE*) src_state)->user_callback_data = cb_data ;
return src_state ;
} /* src_callback_new */
SRC_STATE *
src_delete (SRC_STATE *state)
{ SRC_PRIVATE *psrc ;
psrc = (SRC_PRIVATE*) state ;
if (psrc)
{ if (psrc->private_data)
free (psrc->private_data) ;
memset (psrc, 0, sizeof (SRC_PRIVATE)) ;
free (psrc) ;
} ;
return NULL ;
} /* src_state */
int
src_process (SRC_STATE *state, SRC_DATA *data)
{ SRC_PRIVATE *psrc ;
int error ;
psrc = (SRC_PRIVATE*) state ;
if (psrc == NULL)
return SRC_ERR_BAD_STATE ;
if (psrc->vari_process == NULL || psrc->const_process == NULL)
return SRC_ERR_BAD_PROC_PTR ;
if (psrc->mode != SRC_MODE_PROCESS)
return SRC_ERR_BAD_MODE ;
/* Check for valid SRC_DATA first. */
if (data == NULL)
return SRC_ERR_BAD_DATA ;
/* And that data_in and data_out are valid. */
if (data->data_in == NULL || data->data_out == NULL)
return SRC_ERR_BAD_DATA_PTR ;
/* Check src_ratio is in range. */
if (is_bad_src_ratio (data->src_ratio))
return SRC_ERR_BAD_SRC_RATIO ;
if (data->input_frames < 0)
data->input_frames = 0 ;
if (data->output_frames < 0)
data->output_frames = 0 ;
if (data->data_in < data->data_out)
{ if (data->data_in + data->input_frames * psrc->channels > data->data_out)
{ /*-printf ("\n\ndata_in: %p data_out: %p\n",
(void*) (data->data_in + data->input_frames * psrc->channels), (void*) data->data_out) ;-*/
return SRC_ERR_DATA_OVERLAP ;
} ;
}
else if (data->data_out + data->output_frames * psrc->channels > data->data_in)
{ /*-printf ("\n\ndata_in : %p ouput frames: %ld data_out: %p\n", (void*) data->data_in, data->output_frames, (void*) data->data_out) ;
printf ("data_out: %p (%p) data_in: %p\n", (void*) data->data_out,
(void*) (data->data_out + data->input_frames * psrc->channels), (void*) data->data_in) ;-*/
return SRC_ERR_DATA_OVERLAP ;
} ;
/* Set the input and output counts to zero. */
data->input_frames_used = 0 ;
data->output_frames_gen = 0 ;
/* Special case for when last_ratio has not been set. */
if (psrc->last_ratio < (1.0 / SRC_MAX_RATIO))
psrc->last_ratio = data->src_ratio ;
/* Now process. */
if (fabs (psrc->last_ratio - data->src_ratio) < 1e-15)
error = psrc->const_process (psrc, data) ;
else
error = psrc->vari_process (psrc, data) ;
return error ;
} /* src_process */
long
src_callback_read (SRC_STATE *state, double src_ratio, long frames, float *data)
{ SRC_PRIVATE *psrc ;
SRC_DATA src_data ;
long output_frames_gen ;
int error = 0 ;
if (state == NULL)
return 0 ;
if (frames <= 0)
return 0 ;
psrc = (SRC_PRIVATE*) state ;
if (psrc->mode != SRC_MODE_CALLBACK)
{ psrc->error = SRC_ERR_BAD_MODE ;
return 0 ;
} ;
if (psrc->callback_func == NULL)
{ psrc->error = SRC_ERR_NULL_CALLBACK ;
return 0 ;
} ;
memset (&src_data, 0, sizeof (src_data)) ;
/* Check src_ratio is in range. */
if (is_bad_src_ratio (src_ratio))
{ psrc->error = SRC_ERR_BAD_SRC_RATIO ;
return 0 ;
} ;
/* Switch modes temporarily. */
src_data.src_ratio = src_ratio ;
src_data.data_out = data ;
src_data.output_frames = frames ;
src_data.data_in = psrc->saved_data ;
src_data.input_frames = psrc->saved_frames ;
output_frames_gen = 0 ;
while (output_frames_gen < frames)
{ /* Use a dummy array for the case where the callback function
** returns without setting the ptr.
*/
float dummy [1] ;
if (src_data.input_frames == 0)
{ float *ptr = dummy ;
src_data.input_frames = psrc->callback_func (psrc->user_callback_data, &ptr) ;
src_data.data_in = ptr ;
if (src_data.input_frames == 0)
src_data.end_of_input = 1 ;
} ;
/*
** Now call process function. However, we need to set the mode
** to SRC_MODE_PROCESS first and when we return set it back to
** SRC_MODE_CALLBACK.
*/
psrc->mode = SRC_MODE_PROCESS ;
error = src_process (state, &src_data) ;
psrc->mode = SRC_MODE_CALLBACK ;
if (error != 0)
break ;
src_data.data_in += src_data.input_frames_used * psrc->channels ;
src_data.input_frames -= src_data.input_frames_used ;
src_data.data_out += src_data.output_frames_gen * psrc->channels ;
src_data.output_frames -= src_data.output_frames_gen ;
output_frames_gen += src_data.output_frames_gen ;
if (src_data.end_of_input == SRC_TRUE && src_data.output_frames_gen == 0)
break ;
} ;
psrc->saved_data = src_data.data_in ;
psrc->saved_frames = src_data.input_frames ;
if (error != 0)
{ psrc->error = error ;
return 0 ;
} ;
return output_frames_gen ;
} /* src_callback_read */
/*==========================================================================
*/
int
src_set_ratio (SRC_STATE *state, double new_ratio)
{ SRC_PRIVATE *psrc ;
psrc = (SRC_PRIVATE*) state ;
if (psrc == NULL)
return SRC_ERR_BAD_STATE ;
if (psrc->vari_process == NULL || psrc->const_process == NULL)
return SRC_ERR_BAD_PROC_PTR ;
if (is_bad_src_ratio (new_ratio))
return SRC_ERR_BAD_SRC_RATIO ;
psrc->last_ratio = new_ratio ;
return SRC_ERR_NO_ERROR ;
} /* src_set_ratio */
int
src_get_channels (SRC_STATE *state)
{ SRC_PRIVATE *psrc ;
psrc = (SRC_PRIVATE*) state ;
if (psrc == NULL)
return SRC_ERR_BAD_STATE ;
if (psrc->vari_process == NULL || psrc->const_process == NULL)
return SRC_ERR_BAD_PROC_PTR ;
return psrc->channels ;
} /* src_get_channels */
int
src_reset (SRC_STATE *state)
{ SRC_PRIVATE *psrc ;
if ((psrc = (SRC_PRIVATE*) state) == NULL)
return SRC_ERR_BAD_STATE ;
if (psrc->reset != NULL)
psrc->reset (psrc) ;
psrc->last_position = 0.0 ;
psrc->last_ratio = 0.0 ;
psrc->saved_data = NULL ;
psrc->saved_frames = 0 ;
psrc->error = SRC_ERR_NO_ERROR ;
return SRC_ERR_NO_ERROR ;
} /* src_reset */
/*==============================================================================
** Control functions.
*/
const char *
src_get_name (int converter_type)
{ const char *desc ;
if ((desc = sinc_get_name (converter_type)) != NULL)
return desc ;
if ((desc = zoh_get_name (converter_type)) != NULL)
return desc ;
if ((desc = linear_get_name (converter_type)) != NULL)
return desc ;
return NULL ;
} /* src_get_name */
const char *
src_get_description (int converter_type)
{ const char *desc ;
if ((desc = sinc_get_description (converter_type)) != NULL)
return desc ;
if ((desc = zoh_get_description (converter_type)) != NULL)
return desc ;
if ((desc = linear_get_description (converter_type)) != NULL)
return desc ;
return NULL ;
} /* src_get_description */
const char *
src_get_version (void)
{ return PACKAGE "-" VERSION " (c) 2002-2008 Erik de Castro Lopo" ;
} /* src_get_version */
int
src_is_valid_ratio (double ratio)
{
if (is_bad_src_ratio (ratio))
return SRC_FALSE ;
return SRC_TRUE ;
} /* src_is_valid_ratio */
/*==============================================================================
** Error reporting functions.
*/
int
src_error (SRC_STATE *state)
{ if (state)
return ((SRC_PRIVATE*) state)->error ;
return SRC_ERR_NO_ERROR ;
} /* src_error */
const char*
src_strerror (int error)
{
switch (error)
{ case SRC_ERR_NO_ERROR :
return "No error." ;
case SRC_ERR_MALLOC_FAILED :
return "Malloc failed." ;
case SRC_ERR_BAD_STATE :
return "SRC_STATE pointer is NULL." ;
case SRC_ERR_BAD_DATA :
return "SRC_DATA pointer is NULL." ;
case SRC_ERR_BAD_DATA_PTR :
return "SRC_DATA->data_out or SRC_DATA->data_in is NULL." ;
case SRC_ERR_NO_PRIVATE :
return "Internal error. No private data." ;
case SRC_ERR_BAD_SRC_RATIO :
return "SRC ratio outside [1/" SRC_MAX_RATIO_STR ", " SRC_MAX_RATIO_STR "] range." ;
case SRC_ERR_BAD_SINC_STATE :
return "src_process() called without reset after end_of_input." ;
case SRC_ERR_BAD_PROC_PTR :
return "Internal error. No process pointer." ;
case SRC_ERR_SHIFT_BITS :
return "Internal error. SHIFT_BITS too large." ;
case SRC_ERR_FILTER_LEN :
return "Internal error. Filter length too large." ;
case SRC_ERR_BAD_CONVERTER :
return "Bad converter number." ;
case SRC_ERR_BAD_CHANNEL_COUNT :
return "Channel count must be >= 1." ;
case SRC_ERR_SINC_BAD_BUFFER_LEN :
return "Internal error. Bad buffer length. Please report this." ;
case SRC_ERR_SIZE_INCOMPATIBILITY :
return "Internal error. Input data / internal buffer size difference. Please report this." ;
case SRC_ERR_BAD_PRIV_PTR :
return "Internal error. Private pointer is NULL. Please report this." ;
case SRC_ERR_DATA_OVERLAP :
return "Input and output data arrays overlap." ;
case SRC_ERR_BAD_CALLBACK :
return "Supplied callback function pointer is NULL." ;
case SRC_ERR_BAD_MODE :
return "Calling mode differs from initialisation mode (ie process v callback)." ;
case SRC_ERR_NULL_CALLBACK :
return "Callback function pointer is NULL in src_callback_read ()." ;
case SRC_ERR_NO_VARIABLE_RATIO :
return "This converter only allows constant conversion ratios." ;
case SRC_ERR_SINC_PREPARE_DATA_BAD_LEN :
return "Internal error : Bad length in prepare_data ()." ;
case SRC_ERR_BAD_INTERNAL_STATE :
return "Error : Someone is trampling on my internal state." ;
case SRC_ERR_MAX_ERROR :
return "Placeholder. No error defined for this error number." ;
default : break ;
}
return NULL ;
} /* src_strerror */
/*==============================================================================
** Simple interface for performing a single conversion from input buffer to
** output buffer at a fixed conversion ratio.
*/
int
src_simple (SRC_DATA *src_data, int converter, int channels)
{ SRC_STATE *src_state ;
int error ;
if ((src_state = src_new (converter, channels, &error)) == NULL)
return error ;
src_data->end_of_input = 1 ; /* Only one buffer worth of input. */
error = src_process (src_state, src_data) ;
src_delete (src_state) ;
return error ;
} /* src_simple */
void
src_short_to_float_array (const short *in, float *out, int len)
{
while (len)
{ len -- ;
out [len] = (float) (in [len] / (1.0 * 0x8000)) ;
} ;
return ;
} /* src_short_to_float_array */
void
src_float_to_short_array (const float *in, short *out, int len)
{ double scaled_value ;
while (len)
{ len -- ;
scaled_value = in [len] * (8.0 * 0x10000000) ;
if (CPU_CLIPS_POSITIVE == 0 && scaled_value >= (1.0 * 0x7FFFFFFF))
{ out [len] = 32767 ;
continue ;
} ;
if (CPU_CLIPS_NEGATIVE == 0 && scaled_value <= (-8.0 * 0x10000000))
{ out [len] = -32768 ;
continue ;
} ;
out [len] = (short) (lrint (scaled_value) >> 16) ;
} ;
} /* src_float_to_short_array */
void
src_int_to_float_array (const int *in, float *out, int len)
{
while (len)
{ len -- ;
out [len] = (float) (in [len] / (8.0 * 0x10000000)) ;
} ;
return ;
} /* src_int_to_float_array */
void
src_float_to_int_array (const float *in, int *out, int len)
{ double scaled_value ;
while (len)
{ len -- ;
scaled_value = in [len] * (8.0 * 0x10000000) ;
if (CPU_CLIPS_POSITIVE == 0 && scaled_value >= (1.0 * 0x7FFFFFFF))
{ out [len] = 0x7fffffff ;
continue ;
} ;
if (CPU_CLIPS_NEGATIVE == 0 && scaled_value <= (-8.0 * 0x10000000))
{ out [len] = -1 - 0x7fffffff ;
continue ;
} ;
out [len] = lrint (scaled_value) ;
} ;
} /* src_float_to_int_array */
/*==============================================================================
** Private functions.
*/
static int
psrc_set_converter (SRC_PRIVATE *psrc, int converter_type)
{
if (sinc_set_converter (psrc, converter_type) == SRC_ERR_NO_ERROR)
return SRC_ERR_NO_ERROR ;
if (zoh_set_converter (psrc, converter_type) == SRC_ERR_NO_ERROR)
return SRC_ERR_NO_ERROR ;
if (linear_set_converter (psrc, converter_type) == SRC_ERR_NO_ERROR)
return SRC_ERR_NO_ERROR ;
return SRC_ERR_BAD_CONVERTER ;
} /* psrc_set_converter */

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/*
** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
*/
/*
** API documentation is available here:
** http://www.mega-nerd.com/SRC/api.html
*/
#ifndef SAMPLERATE_H
#define SAMPLERATE_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* Opaque data type SRC_STATE. */
typedef struct SRC_STATE_tag SRC_STATE ;
/* SRC_DATA is used to pass data to src_simple() and src_process(). */
typedef struct
{ const float *data_in ;
float *data_out ;
long input_frames, output_frames ;
long input_frames_used, output_frames_gen ;
int end_of_input ;
double src_ratio ;
} SRC_DATA ;
/*
** User supplied callback function type for use with src_callback_new()
** and src_callback_read(). First parameter is the same pointer that was
** passed into src_callback_new(). Second parameter is pointer to a
** pointer. The user supplied callback function must modify *data to
** point to the start of the user supplied float array. The user supplied
** function must return the number of frames that **data points to.
*/
typedef long (*src_callback_t) (void *cb_data, float **data) ;
/*
** Standard initialisation function : return an anonymous pointer to the
** internal state of the converter. Choose a converter from the enums below.
** Error returned in *error.
*/
SRC_STATE* src_new (int converter_type, int channels, int *error) ;
/*
** Initilisation for callback based API : return an anonymous pointer to the
** internal state of the converter. Choose a converter from the enums below.
** The cb_data pointer can point to any data or be set to NULL. Whatever the
** value, when processing, user supplied function "func" gets called with
** cb_data as first parameter.
*/
SRC_STATE* src_callback_new (src_callback_t func, int converter_type, int channels,
int *error, void* cb_data) ;
/*
** Cleanup all internal allocations.
** Always returns NULL.
*/
SRC_STATE* src_delete (SRC_STATE *state) ;
/*
** Standard processing function.
** Returns non zero on error.
*/
int src_process (SRC_STATE *state, SRC_DATA *data) ;
/*
** Callback based processing function. Read up to frames worth of data from
** the converter int *data and return frames read or -1 on error.
*/
long src_callback_read (SRC_STATE *state, double src_ratio, long frames, float *data) ;
/*
** Simple interface for performing a single conversion from input buffer to
** output buffer at a fixed conversion ratio.
** Simple interface does not require initialisation as it can only operate on
** a single buffer worth of audio.
*/
int src_simple (SRC_DATA *data, int converter_type, int channels) ;
/*
** This library contains a number of different sample rate converters,
** numbered 0 through N.
**
** Return a string giving either a name or a more full description of each
** sample rate converter or NULL if no sample rate converter exists for
** the given value. The converters are sequentially numbered from 0 to N.
*/
const char *src_get_name (int converter_type) ;
const char *src_get_description (int converter_type) ;
const char *src_get_version (void) ;
/*
** Set a new SRC ratio. This allows step responses
** in the conversion ratio.
** Returns non zero on error.
*/
int src_set_ratio (SRC_STATE *state, double new_ratio) ;
/*
** Get the current channel count.
** Returns negative on error, positive channel count otherwise
*/
int src_get_channels (SRC_STATE *state) ;
/*
** Reset the internal SRC state.
** Does not modify the quality settings.
** Does not free any memory allocations.
** Returns non zero on error.
*/
int src_reset (SRC_STATE *state) ;
/*
** Return TRUE if ratio is a valid conversion ratio, FALSE
** otherwise.
*/
int src_is_valid_ratio (double ratio) ;
/*
** Return an error number.
*/
int src_error (SRC_STATE *state) ;
/*
** Convert the error number into a string.
*/
const char* src_strerror (int error) ;
/*
** The following enums can be used to set the interpolator type
** using the function src_set_converter().
*/
enum
{
SRC_SINC_BEST_QUALITY = 0,
SRC_SINC_MEDIUM_QUALITY = 1,
SRC_SINC_FASTEST = 2,
SRC_ZERO_ORDER_HOLD = 3,
SRC_LINEAR = 4,
} ;
/*
** Extra helper functions for converting from short to float and
** back again.
*/
void src_short_to_float_array (const short *in, float *out, int len) ;
void src_float_to_short_array (const float *in, short *out, int len) ;
void src_int_to_float_array (const int *in, float *out, int len) ;
void src_float_to_int_array (const float *in, int *out, int len) ;
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
#endif /* SAMPLERATE_H */

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/*
** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "float_cast.h"
#include "common.h"
static int linear_vari_process (SRC_PRIVATE *psrc, SRC_DATA *data) ;
static void linear_reset (SRC_PRIVATE *psrc) ;
/*========================================================================================
*/
#define LINEAR_MAGIC_MARKER MAKE_MAGIC ('l', 'i', 'n', 'e', 'a', 'r')
#define SRC_DEBUG 0
typedef struct
{ int linear_magic_marker ;
int channels ;
int reset ;
long in_count, in_used ;
long out_count, out_gen ;
float last_value [1] ;
} LINEAR_DATA ;
/*----------------------------------------------------------------------------------------
*/
static int
linear_vari_process (SRC_PRIVATE *psrc, SRC_DATA *data)
{ LINEAR_DATA *priv ;
double src_ratio, input_index, rem ;
int ch ;
if (data->input_frames <= 0)
return SRC_ERR_NO_ERROR ;
if (psrc->private_data == NULL)
return SRC_ERR_NO_PRIVATE ;
priv = (LINEAR_DATA*) psrc->private_data ;
if (priv->reset)
{ /* If we have just been reset, set the last_value data. */
for (ch = 0 ; ch < priv->channels ; ch++)
priv->last_value [ch] = data->data_in [ch] ;
priv->reset = 0 ;
} ;
priv->in_count = data->input_frames * priv->channels ;
priv->out_count = data->output_frames * priv->channels ;
priv->in_used = priv->out_gen = 0 ;
src_ratio = psrc->last_ratio ;
if (is_bad_src_ratio (src_ratio))
return SRC_ERR_BAD_INTERNAL_STATE ;
input_index = psrc->last_position ;
/* Calculate samples before first sample in input array. */
while (input_index < 1.0 && priv->out_gen < priv->out_count)
{
if (priv->in_used + priv->channels * (1.0 + input_index) >= priv->in_count)
break ;
if (priv->out_count > 0 && fabs (psrc->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
src_ratio = psrc->last_ratio + priv->out_gen * (data->src_ratio - psrc->last_ratio) / priv->out_count ;
for (ch = 0 ; ch < priv->channels ; ch++)
{ data->data_out [priv->out_gen] = (float) (priv->last_value [ch] + input_index *
(data->data_in [ch] - priv->last_value [ch])) ;
priv->out_gen ++ ;
} ;
/* Figure out the next index. */
input_index += 1.0 / src_ratio ;
} ;
rem = fmod_one (input_index) ;
priv->in_used += priv->channels * lrint (input_index - rem) ;
input_index = rem ;
/* Main processing loop. */
while (priv->out_gen < priv->out_count && priv->in_used + priv->channels * input_index < priv->in_count)
{
if (priv->out_count > 0 && fabs (psrc->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
src_ratio = psrc->last_ratio + priv->out_gen * (data->src_ratio - psrc->last_ratio) / priv->out_count ;
if (SRC_DEBUG && priv->in_used < priv->channels && input_index < 1.0)
{ printf ("Whoops!!!! in_used : %ld channels : %d input_index : %f\n", priv->in_used, priv->channels, input_index) ;
exit (1) ;
} ;
for (ch = 0 ; ch < priv->channels ; ch++)
{ data->data_out [priv->out_gen] = (float) (data->data_in [priv->in_used - priv->channels + ch] + input_index *
(data->data_in [priv->in_used + ch] - data->data_in [priv->in_used - priv->channels + ch])) ;
priv->out_gen ++ ;
} ;
/* Figure out the next index. */
input_index += 1.0 / src_ratio ;
rem = fmod_one (input_index) ;
priv->in_used += priv->channels * lrint (input_index - rem) ;
input_index = rem ;
} ;
if (priv->in_used > priv->in_count)
{ input_index += (priv->in_used - priv->in_count) / priv->channels ;
priv->in_used = priv->in_count ;
} ;
psrc->last_position = input_index ;
if (priv->in_used > 0)
for (ch = 0 ; ch < priv->channels ; ch++)
priv->last_value [ch] = data->data_in [priv->in_used - priv->channels + ch] ;
/* Save current ratio rather then target ratio. */
psrc->last_ratio = src_ratio ;
data->input_frames_used = priv->in_used / priv->channels ;
data->output_frames_gen = priv->out_gen / priv->channels ;
return SRC_ERR_NO_ERROR ;
} /* linear_vari_process */
/*------------------------------------------------------------------------------
*/
const char*
linear_get_name (int src_enum)
{
if (src_enum == SRC_LINEAR)
return "Linear Interpolator" ;
return NULL ;
} /* linear_get_name */
const char*
linear_get_description (int src_enum)
{
if (src_enum == SRC_LINEAR)
return "Linear interpolator, very fast, poor quality." ;
return NULL ;
} /* linear_get_descrition */
int
linear_set_converter (SRC_PRIVATE *psrc, int src_enum)
{ LINEAR_DATA *priv = NULL ;
if (src_enum != SRC_LINEAR)
return SRC_ERR_BAD_CONVERTER ;
if (psrc->private_data != NULL)
{ free (psrc->private_data) ;
psrc->private_data = NULL ;
} ;
if (psrc->private_data == NULL)
{ priv = calloc (1, sizeof (*priv) + psrc->channels * sizeof (float)) ;
psrc->private_data = priv ;
} ;
if (priv == NULL)
return SRC_ERR_MALLOC_FAILED ;
priv->linear_magic_marker = LINEAR_MAGIC_MARKER ;
priv->channels = psrc->channels ;
psrc->const_process = linear_vari_process ;
psrc->vari_process = linear_vari_process ;
psrc->reset = linear_reset ;
linear_reset (psrc) ;
return SRC_ERR_NO_ERROR ;
} /* linear_set_converter */
/*===================================================================================
*/
static void
linear_reset (SRC_PRIVATE *psrc)
{ LINEAR_DATA *priv = NULL ;
priv = (LINEAR_DATA*) psrc->private_data ;
if (priv == NULL)
return ;
priv->channels = psrc->channels ;
priv->reset = 1 ;
memset (priv->last_value, 0, sizeof (priv->last_value [0]) * priv->channels) ;
return ;
} /* linear_reset */

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/*
** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "float_cast.h"
#include "common.h"
static int zoh_vari_process (SRC_PRIVATE *psrc, SRC_DATA *data) ;
static void zoh_reset (SRC_PRIVATE *psrc) ;
/*========================================================================================
*/
#define ZOH_MAGIC_MARKER MAKE_MAGIC ('s', 'r', 'c', 'z', 'o', 'h')
typedef struct
{ int zoh_magic_marker ;
int channels ;
int reset ;
long in_count, in_used ;
long out_count, out_gen ;
float last_value [1] ;
} ZOH_DATA ;
/*----------------------------------------------------------------------------------------
*/
static int
zoh_vari_process (SRC_PRIVATE *psrc, SRC_DATA *data)
{ ZOH_DATA *priv ;
double src_ratio, input_index, rem ;
int ch ;
if (data->input_frames <= 0)
return SRC_ERR_NO_ERROR ;
if (psrc->private_data == NULL)
return SRC_ERR_NO_PRIVATE ;
priv = (ZOH_DATA*) psrc->private_data ;
if (priv->reset)
{ /* If we have just been reset, set the last_value data. */
for (ch = 0 ; ch < priv->channels ; ch++)
priv->last_value [ch] = data->data_in [ch] ;
priv->reset = 0 ;
} ;
priv->in_count = data->input_frames * priv->channels ;
priv->out_count = data->output_frames * priv->channels ;
priv->in_used = priv->out_gen = 0 ;
src_ratio = psrc->last_ratio ;
if (is_bad_src_ratio (src_ratio))
return SRC_ERR_BAD_INTERNAL_STATE ;
input_index = psrc->last_position ;
/* Calculate samples before first sample in input array. */
while (input_index < 1.0 && priv->out_gen < priv->out_count)
{
if (priv->in_used + priv->channels * input_index >= priv->in_count)
break ;
if (priv->out_count > 0 && fabs (psrc->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
src_ratio = psrc->last_ratio + priv->out_gen * (data->src_ratio - psrc->last_ratio) / priv->out_count ;
for (ch = 0 ; ch < priv->channels ; ch++)
{ data->data_out [priv->out_gen] = priv->last_value [ch] ;
priv->out_gen ++ ;
} ;
/* Figure out the next index. */
input_index += 1.0 / src_ratio ;
} ;
rem = fmod_one (input_index) ;
priv->in_used += priv->channels * lrint (input_index - rem) ;
input_index = rem ;
/* Main processing loop. */
while (priv->out_gen < priv->out_count && priv->in_used + priv->channels * input_index <= priv->in_count)
{
if (priv->out_count > 0 && fabs (psrc->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
src_ratio = psrc->last_ratio + priv->out_gen * (data->src_ratio - psrc->last_ratio) / priv->out_count ;
for (ch = 0 ; ch < priv->channels ; ch++)
{ data->data_out [priv->out_gen] = data->data_in [priv->in_used - priv->channels + ch] ;
priv->out_gen ++ ;
} ;
/* Figure out the next index. */
input_index += 1.0 / src_ratio ;
rem = fmod_one (input_index) ;
priv->in_used += priv->channels * lrint (input_index - rem) ;
input_index = rem ;
} ;
if (priv->in_used > priv->in_count)
{ input_index += (priv->in_used - priv->in_count) / priv->channels ;
priv->in_used = priv->in_count ;
} ;
psrc->last_position = input_index ;
if (priv->in_used > 0)
for (ch = 0 ; ch < priv->channels ; ch++)
priv->last_value [ch] = data->data_in [priv->in_used - priv->channels + ch] ;
/* Save current ratio rather then target ratio. */
psrc->last_ratio = src_ratio ;
data->input_frames_used = priv->in_used / priv->channels ;
data->output_frames_gen = priv->out_gen / priv->channels ;
return SRC_ERR_NO_ERROR ;
} /* zoh_vari_process */
/*------------------------------------------------------------------------------
*/
const char*
zoh_get_name (int src_enum)
{
if (src_enum == SRC_ZERO_ORDER_HOLD)
return "ZOH Interpolator" ;
return NULL ;
} /* zoh_get_name */
const char*
zoh_get_description (int src_enum)
{
if (src_enum == SRC_ZERO_ORDER_HOLD)
return "Zero order hold interpolator, very fast, poor quality." ;
return NULL ;
} /* zoh_get_descrition */
int
zoh_set_converter (SRC_PRIVATE *psrc, int src_enum)
{ ZOH_DATA *priv = NULL ;
if (src_enum != SRC_ZERO_ORDER_HOLD)
return SRC_ERR_BAD_CONVERTER ;
if (psrc->private_data != NULL)
{ free (psrc->private_data) ;
psrc->private_data = NULL ;
} ;
if (psrc->private_data == NULL)
{ priv = calloc (1, sizeof (*priv) + psrc->channels * sizeof (float)) ;
psrc->private_data = priv ;
} ;
if (priv == NULL)
return SRC_ERR_MALLOC_FAILED ;
priv->zoh_magic_marker = ZOH_MAGIC_MARKER ;
priv->channels = psrc->channels ;
psrc->const_process = zoh_vari_process ;
psrc->vari_process = zoh_vari_process ;
psrc->reset = zoh_reset ;
zoh_reset (psrc) ;
return SRC_ERR_NO_ERROR ;
} /* zoh_set_converter */
/*===================================================================================
*/
static void
zoh_reset (SRC_PRIVATE *psrc)
{ ZOH_DATA *priv ;
priv = (ZOH_DATA*) psrc->private_data ;
if (priv == NULL)
return ;
priv->channels = psrc->channels ;
priv->reset = 1 ;
memset (priv->last_value, 0, sizeof (priv->last_value [0]) * priv->channels) ;
return ;
} /* zoh_reset */

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