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Add libsamplerate to source tree

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This commit is contained in:
John Alanbrook 2023-02-28 15:40:46 +00:00
parent b6788e25b1
commit 4aa6780a8e
10 changed files with 368188 additions and 0 deletions
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189
source/engine/thirdparty/libsamplerate/include/samplerate.h vendored Normal file
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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/libsndfile/libsamplerate/blob/master/COPYING
*/
/*
** API documentation is available here:
** http://libsndfile.github.io/libsamplerate/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) ;
/*
** Clone a handle : return an anonymous pointer to a new converter
** containing the same internal state as orig. Error returned in *error.
*/
SRC_STATE* src_clone (SRC_STATE* orig, 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) 2002-2021, 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/libsndfile/libsamplerate/blob/master/COPYING
*/
#ifndef COMMON_H_INCLUDED
#define COMMON_H_INCLUDED
#include <stdint.h>
#ifdef HAVE_STDBOOL_H
#include <stdbool.h>
#endif
#if HAVE_IMMINTRIN_H
#include <immintrin.h>
#endif
#include <math.h>
#ifdef HAVE_VISIBILITY
#define LIBSAMPLERATE_DLL_PRIVATE __attribute__ ((visibility ("hidden")))
#elif defined (__APPLE__)
#define LIBSAMPLERATE_DLL_PRIVATE __private_extern__
#else
#define LIBSAMPLERATE_DLL_PRIVATE
#endif
#define SRC_MAX_RATIO 256
#define SRC_MAX_RATIO_STR "256"
#define SRC_MIN_RATIO_DIFF (1e-20)
#ifndef MAX
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#endif
#ifndef MIN
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#endif
#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,
} ;
enum SRC_MODE
{
SRC_MODE_PROCESS = 0,
SRC_MODE_CALLBACK = 1
} ;
typedef enum SRC_ERROR
{
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
} SRC_ERROR ;
typedef struct SRC_STATE_VT_tag
{
/* Varispeed process function. */
SRC_ERROR (*vari_process) (SRC_STATE *state, SRC_DATA *data) ;
/* Constant speed process function. */
SRC_ERROR (*const_process) (SRC_STATE *state, SRC_DATA *data) ;
/* State reset. */
void (*reset) (SRC_STATE *state) ;
/* State clone. */
SRC_STATE *(*copy) (SRC_STATE *state) ;
/* State close. */
void (*close) (SRC_STATE *state) ;
} SRC_STATE_VT ;
struct SRC_STATE_tag
{
SRC_STATE_VT *vt ;
double last_ratio, last_position ;
SRC_ERROR error ;
int channels ;
/* SRC_MODE_PROCESS or SRC_MODE_CALLBACK */
enum SRC_MODE mode ;
/* Data specific to SRC_MODE_CALLBACK. */
src_callback_t callback_func ;
void *user_callback_data ;
long saved_frames ;
const float *saved_data ;
/* Pointer to data to converter specific data. */
void *private_data ;
} ;
/* In src_sinc.c */
const char* sinc_get_name (int src_enum) ;
const char* sinc_get_description (int src_enum) ;
SRC_STATE *sinc_state_new (int converter_type, int channels, SRC_ERROR *error) ;
/* In src_linear.c */
const char* linear_get_name (int src_enum) ;
const char* linear_get_description (int src_enum) ;
SRC_STATE *linear_state_new (int channels, SRC_ERROR *error) ;
/* In src_zoh.c */
const char* zoh_get_name (int src_enum) ;
const char* zoh_get_description (int src_enum) ;
SRC_STATE *zoh_state_new (int channels, SRC_ERROR *error) ;
/*----------------------------------------------------------
** SIMD optimized math functions.
*/
static inline int psf_lrintf (float x)
{
#ifdef HAVE_IMMINTRIN_H
return _mm_cvtss_si32 (_mm_load_ss (&x)) ;
#else
return lrintf (x) ;
#endif
} /* psf_lrintf */
static inline int psf_lrint (double x)
{
#ifdef HAVE_IMMINTRIN_H
return _mm_cvtsd_si32 (_mm_load_sd (&x)) ;
#else
return lrint (x) ;
#endif
} /* psf_lrint */
/*----------------------------------------------------------
** Common static inline functions.
*/
static inline double
fmod_one (double x)
{ double res ;
res = x - psf_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. */
/* Define if building universal (internal helper macro) */
/* #undef AC_APPLE_UNIVERSAL_BUILD */
/* Host processor clips on negative float to int conversion. */
#define CPU_CLIPS_NEGATIVE 0
/* Host processor clips on positive float to int conversion. */
#define CPU_CLIPS_POSITIVE 0
/* Host processor is big endian. */
#define CPU_IS_BIG_ENDIAN 0
/* Host processor is little endian. */
#define CPU_IS_LITTLE_ENDIAN 1
/* Enable sinc best converter. */
#define ENABLE_SINC_BEST_CONVERTER yes
/* Enable sinc fast converter. */
#define ENABLE_SINC_FAST_CONVERTER yes
/* Enable sinc balanced converter. */
#define ENABLE_SINC_MEDIUM_CONVERTER yes
/* Define to 1 if you have the `alarm' function. */
#define HAVE_ALARM 1
/* Set to 1 if you have alsa */
#define HAVE_ALSA 1
/* Define to 1 if you have the `calloc' function. */
#define HAVE_CALLOC 1
/* Define to 1 if you have the `ceil' function. */
/* #undef HAVE_CEIL */
/* Define to 1 if you have the <dlfcn.h> header file. */
#define HAVE_DLFCN_H 1
/* Set to 1 if you have fftw3 */
/* #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. */
#define HAVE_FREE 1
/* Define to 1 if you have the <immintrin.h> header file. */
/* #undef HAVE_IMMINTRIN_H */
/* Define to 1 if you have the <inttypes.h> header file. */
#define HAVE_INTTYPES_H 1
/* Define to 1 if you have the `lrint' function. */
/* #undef HAVE_LRINT */
/* Define to 1 if you have the `lrintf' function. */
/* #undef HAVE_LRINTF */
/* 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 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 */
/* #undef HAVE_SNDFILE */
/* Define to 1 if you have the <stdbool.h> header file. */
#define HAVE_STDBOOL_H 1
/* Define to 1 if you have the <stdint.h> header file. */
#define HAVE_STDINT_H 1
/* Define to 1 if you have the <stdio.h> header file. */
#define HAVE_STDIO_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 1 if the compiler supports simple visibility declarations. */
#define HAVE_VISIBILITY 1
/* Define to the sub-directory where libtool stores uninstalled libraries. */
#define LT_OBJDIR ".libs/"
/* 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 0.2.2"
/* 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 "https://github.com/libsndfile/libsamplerate/"
/* Define to the version of this package. */
#define PACKAGE_VERSION "0.2.2"
/* 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 all of the C90 standard headers exist (not just the ones
required in a freestanding environment). This macro is provided for
backward compatibility; new code need not use it. */
#define STDC_HEADERS 1
/* Version number of package */
#define VERSION "0.2.2"
/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
significant byte first (like Motorola and SPARC, unlike Intel). */
#if defined AC_APPLE_UNIVERSAL_BUILD
# if defined __BIG_ENDIAN__
# define WORDS_BIGENDIAN 1
# endif
#else
# ifndef WORDS_BIGENDIAN
/* # undef WORDS_BIGENDIAN */
# endif
#endif

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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/libsndfile/libsamplerate/blob/master/COPYING
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "samplerate.h"
#include "common.h"
static SRC_STATE *psrc_set_converter (int converter_type, int channels, int *error) ;
SRC_STATE *
src_new (int converter_type, int channels, int *error)
{
return psrc_set_converter (converter_type, channels, error) ;
} /* src_new */
SRC_STATE*
src_clone (SRC_STATE* orig, int *error)
{
if (!orig)
{
if (error)
*error = SRC_ERR_BAD_STATE ;
return NULL ;
}
if (error)
*error = SRC_ERR_NO_ERROR ;
SRC_STATE *state = orig->vt->copy (orig) ;
if (!state)
if (error)
*error = SRC_ERR_MALLOC_FAILED ;
return state ;
}
SRC_STATE*
src_callback_new (src_callback_t func, int converter_type, int channels, int *error, void* cb_data)
{ SRC_STATE *state ;
if (func == NULL)
{ if (error)
*error = SRC_ERR_BAD_CALLBACK ;
return NULL ;
} ;
if (error != NULL)
*error = 0 ;
if ((state = src_new (converter_type, channels, error)) == NULL)
return NULL ;
src_reset (state) ;
state->mode = SRC_MODE_CALLBACK ;
state->callback_func = func ;
state->user_callback_data = cb_data ;
return state ;
} /* src_callback_new */
SRC_STATE *
src_delete (SRC_STATE *state)
{
if (state)
state->vt->close (state) ;
return NULL ;
} /* src_state */
int
src_process (SRC_STATE *state, SRC_DATA *data)
{
int error ;
if (state == NULL)
return SRC_ERR_BAD_STATE ;
if (state->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->input_frames > 0)
|| (data->data_out == NULL && data->output_frames > 0))
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 * state->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 * state->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 (state->last_ratio < (1.0 / SRC_MAX_RATIO))
state->last_ratio = data->src_ratio ;
/* Now process. */
if (fabs (state->last_ratio - data->src_ratio) < 1e-15)
error = state->vt->const_process (state, data) ;
else
error = state->vt->vari_process (state, data) ;
return error ;
} /* src_process */
long
src_callback_read (SRC_STATE *state, double src_ratio, long frames, float *data)
{
SRC_DATA src_data ;
long output_frames_gen ;
int error = 0 ;
if (state == NULL)
return 0 ;
if (frames <= 0)
return 0 ;
if (state->mode != SRC_MODE_CALLBACK)
{ state->error = SRC_ERR_BAD_MODE ;
return 0 ;
} ;
if (state->callback_func == NULL)
{ state->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))
{ state->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 = state->saved_data ;
src_data.input_frames = state->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 = state->callback_func (state->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.
*/
state->mode = SRC_MODE_PROCESS ;
error = src_process (state, &src_data) ;
state->mode = SRC_MODE_CALLBACK ;
if (error != 0)
break ;
src_data.data_in += src_data.input_frames_used * state->channels ;
src_data.input_frames -= src_data.input_frames_used ;
src_data.data_out += src_data.output_frames_gen * state->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 ;
} ;
state->saved_data = src_data.data_in ;
state->saved_frames = src_data.input_frames ;
if (error != 0)
{ state->error = (SRC_ERROR) error ;
return 0 ;
} ;
return output_frames_gen ;
} /* src_callback_read */
/*==========================================================================
*/
int
src_set_ratio (SRC_STATE *state, double new_ratio)
{
if (state == NULL)
return SRC_ERR_BAD_STATE ;
if (is_bad_src_ratio (new_ratio))
return SRC_ERR_BAD_SRC_RATIO ;
state->last_ratio = new_ratio ;
return SRC_ERR_NO_ERROR ;
} /* src_set_ratio */
int
src_get_channels (SRC_STATE *state)
{
if (state == NULL)
return -SRC_ERR_BAD_STATE ;
return state->channels ;
} /* src_get_channels */
int
src_reset (SRC_STATE *state)
{
if (state == NULL)
return SRC_ERR_BAD_STATE ;
state->vt->reset (state) ;
state->last_position = 0.0 ;
state->last_ratio = 0.0 ;
state->saved_data = NULL ;
state->saved_frames = 0 ;
state->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 "VERSION";//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 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)
{
for (int i = 0 ; i < len ; i++)
{ out [i] = (float) (in [i] / (1.0 * 0x8000)) ;
} ;
return ;
} /* src_short_to_float_array */
void
src_float_to_short_array (const float *in, short *out, int len)
{
for (int i = 0 ; i < len ; i++)
{ float scaled_value ;
scaled_value = in [i] * 32768.f ;
if (scaled_value >= 32767.f)
out [i] = 32767 ;
else if (scaled_value <= -32768.f)
out [i] = -32768 ;
else
out [i] = (short) (psf_lrintf (scaled_value)) ;
}
} /* src_float_to_short_array */
void
src_int_to_float_array (const int *in, float *out, int len)
{
for (int i = 0 ; i < len ; i++)
{ out [i] = (float) (in [i] / (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 ;
for (int i = 0 ; i < len ; i++)
{ scaled_value = in [i] * (8.0 * 0x10000000) ;
#if CPU_CLIPS_POSITIVE == 0
if (scaled_value >= (1.0 * 0x7FFFFFFF))
{ out [i] = 0x7fffffff ;
continue ;
} ;
#endif
#if CPU_CLIPS_NEGATIVE == 0
if (scaled_value <= (-8.0 * 0x10000000))
{ out [i] = -1 - 0x7fffffff ;
continue ;
} ;
#endif
out [i] = (int) psf_lrint (scaled_value) ;
} ;
} /* src_float_to_int_array */
/*==============================================================================
** Private functions.
*/
static SRC_STATE *
psrc_set_converter (int converter_type, int channels, int *error)
{
SRC_ERROR temp_error;
SRC_STATE *state ;
switch (converter_type)
{
#ifdef ENABLE_SINC_BEST_CONVERTER
case SRC_SINC_BEST_QUALITY :
state = sinc_state_new (converter_type, channels, &temp_error) ;
break ;
#endif
#ifdef ENABLE_SINC_MEDIUM_CONVERTER
case SRC_SINC_MEDIUM_QUALITY :
state = sinc_state_new (converter_type, channels, &temp_error) ;
break ;
#endif
#ifdef ENABLE_SINC_FAST_CONVERTER
case SRC_SINC_FASTEST :
state = sinc_state_new (converter_type, channels, &temp_error) ;
break ;
#endif
case SRC_ZERO_ORDER_HOLD :
state = zoh_state_new (channels, &temp_error) ;
break ;
case SRC_LINEAR :
state = linear_state_new (channels, &temp_error) ;
break ;
default :
temp_error = SRC_ERR_BAD_CONVERTER ;
state = NULL ;
break ;
}
if (error)
*error = (int) temp_error ;
return state ;
} /* psrc_set_converter */

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/*
** Copyright (c) 2002-2021, 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/libsndfile/libsamplerate/blob/master/COPYING
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "common.h"
static SRC_ERROR linear_vari_process (SRC_STATE *state, SRC_DATA *data) ;
static void linear_reset (SRC_STATE *state) ;
static SRC_STATE *linear_copy (SRC_STATE *state) ;
static void linear_close (SRC_STATE *state) ;
/*========================================================================================
*/
#define LINEAR_MAGIC_MARKER MAKE_MAGIC ('l', 'i', 'n', 'e', 'a', 'r')
#define SRC_DEBUG 0
typedef struct
{ int linear_magic_marker ;
int dirty ;
long in_count, in_used ;
long out_count, out_gen ;
float *last_value ;
} LINEAR_DATA ;
static SRC_STATE_VT linear_state_vt =
{
linear_vari_process,
linear_vari_process,
linear_reset,
linear_copy,
linear_close
} ;
/*----------------------------------------------------------------------------------------
*/
static SRC_ERROR
linear_vari_process (SRC_STATE *state, 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 (state->private_data == NULL)
return SRC_ERR_NO_PRIVATE ;
priv = (LINEAR_DATA*) state->private_data ;
if (!priv->dirty)
{ /* If we have just been reset, set the last_value data. */
for (ch = 0 ; ch < state->channels ; ch++)
priv->last_value [ch] = data->data_in [ch] ;
priv->dirty = 1 ;
} ;
priv->in_count = data->input_frames * state->channels ;
priv->out_count = data->output_frames * state->channels ;
priv->in_used = priv->out_gen = 0 ;
src_ratio = state->last_ratio ;
if (is_bad_src_ratio (src_ratio))
return SRC_ERR_BAD_INTERNAL_STATE ;
input_index = state->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 + state->channels * (1.0 + input_index) >= priv->in_count)
break ;
if (priv->out_count > 0 && fabs (state->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
src_ratio = state->last_ratio + priv->out_gen * (data->src_ratio - state->last_ratio) / priv->out_count ;
for (ch = 0 ; ch < state->channels ; ch++)
{ data->data_out [priv->out_gen] = (float) (priv->last_value [ch] + input_index *
((double) 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 += state->channels * psf_lrint (input_index - rem) ;
input_index = rem ;
/* Main processing loop. */
while (priv->out_gen < priv->out_count && priv->in_used + state->channels * input_index < priv->in_count)
{
if (priv->out_count > 0 && fabs (state->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
src_ratio = state->last_ratio + priv->out_gen * (data->src_ratio - state->last_ratio) / priv->out_count ;
#if SRC_DEBUG
if (priv->in_used < state->channels && input_index < 1.0)
{ printf ("Whoops!!!! in_used : %ld channels : %d input_index : %f\n", priv->in_used, state->channels, input_index) ;
exit (1) ;
} ;
#endif
for (ch = 0 ; ch < state->channels ; ch++)
{ data->data_out [priv->out_gen] = (float) (data->data_in [priv->in_used - state->channels + ch] + input_index *
((double) data->data_in [priv->in_used + ch] - data->data_in [priv->in_used - state->channels + ch])) ;
priv->out_gen ++ ;
} ;
/* Figure out the next index. */
input_index += 1.0 / src_ratio ;
rem = fmod_one (input_index) ;
priv->in_used += state->channels * psf_lrint (input_index - rem) ;
input_index = rem ;
} ;
if (priv->in_used > priv->in_count)
{ input_index += (priv->in_used - priv->in_count) / state->channels ;
priv->in_used = priv->in_count ;
} ;
state->last_position = input_index ;
if (priv->in_used > 0)
for (ch = 0 ; ch < state->channels ; ch++)
priv->last_value [ch] = data->data_in [priv->in_used - state->channels + ch] ;
/* Save current ratio rather then target ratio. */
state->last_ratio = src_ratio ;
data->input_frames_used = priv->in_used / state->channels ;
data->output_frames_gen = priv->out_gen / state->channels ;
return SRC_ERR_NO_ERROR ;
} /* linear_vari_process */
/*------------------------------------------------------------------------------
*/
LIBSAMPLERATE_DLL_PRIVATE const char*
linear_get_name (int src_enum)
{
if (src_enum == SRC_LINEAR)
return "Linear Interpolator" ;
return NULL ;
} /* linear_get_name */
LIBSAMPLERATE_DLL_PRIVATE 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 */
static LINEAR_DATA *
linear_data_new (int channels)
{
assert (channels > 0) ;
LINEAR_DATA *priv = (LINEAR_DATA *) calloc (1, sizeof (LINEAR_DATA)) ;
if (priv)
{
priv->linear_magic_marker = LINEAR_MAGIC_MARKER ;
priv->last_value = (float *) calloc (channels, sizeof (float)) ;
if (!priv->last_value)
{
free (priv) ;
priv = NULL ;
}
}
return priv ;
}
LIBSAMPLERATE_DLL_PRIVATE SRC_STATE *
linear_state_new (int channels, SRC_ERROR *error)
{
assert (channels > 0) ;
assert (error != NULL) ;
SRC_STATE *state = (SRC_STATE *) calloc (1, sizeof (SRC_STATE)) ;
if (!state)
{
*error = SRC_ERR_MALLOC_FAILED ;
return NULL ;
}
state->channels = channels ;
state->mode = SRC_MODE_PROCESS ;
state->private_data = linear_data_new (state->channels) ;
if (!state->private_data)
{
free (state) ;
*error = SRC_ERR_MALLOC_FAILED ;
return NULL ;
}
state->vt = &linear_state_vt ;
linear_reset (state) ;
*error = SRC_ERR_NO_ERROR ;
return state ;
}
/*===================================================================================
*/
static void
linear_reset (SRC_STATE *state)
{ LINEAR_DATA *priv = NULL ;
priv = (LINEAR_DATA*) state->private_data ;
if (priv == NULL)
return ;
priv->dirty = 0 ;
memset (priv->last_value, 0, sizeof (priv->last_value [0]) * state->channels) ;
return ;
} /* linear_reset */
SRC_STATE *
linear_copy (SRC_STATE *state)
{
assert (state != NULL) ;
if (state->private_data == NULL)
return NULL ;
SRC_STATE *to = (SRC_STATE *) calloc (1, sizeof (SRC_STATE)) ;
if (!to)
return NULL ;
memcpy (to, state, sizeof (SRC_STATE)) ;
LINEAR_DATA* from_priv = (LINEAR_DATA*) state->private_data ;
LINEAR_DATA *to_priv = (LINEAR_DATA *) calloc (1, sizeof (LINEAR_DATA)) ;
if (!to_priv)
{
free (to) ;
return NULL ;
}
memcpy (to_priv, from_priv, sizeof (LINEAR_DATA)) ;
to_priv->last_value = (float *) malloc (sizeof (float) * state->channels) ;
if (!to_priv->last_value)
{
free (to) ;
free (to_priv) ;
return NULL ;
}
memcpy (to_priv->last_value, from_priv->last_value, sizeof (float) * state->channels) ;
to->private_data = to_priv ;
return to ;
} /* linear_copy */
static void
linear_close (SRC_STATE *state)
{
if (state)
{
LINEAR_DATA *linear = (LINEAR_DATA *) state->private_data ;
if (linear)
{
if (linear->last_value)
{
free (linear->last_value) ;
linear->last_value = NULL ;
}
free (linear) ;
linear = NULL ;
}
free (state) ;
state = NULL ;
}
} /* linear_close */

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/*
** Copyright (c) 2002-2021, 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/libsndfile/libsamplerate/blob/master/COPYING
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "common.h"
static SRC_ERROR zoh_vari_process (SRC_STATE *state, SRC_DATA *data) ;
static void zoh_reset (SRC_STATE *state) ;
static SRC_STATE *zoh_copy (SRC_STATE *state) ;
static void zoh_close (SRC_STATE *state) ;
/*========================================================================================
*/
#define ZOH_MAGIC_MARKER MAKE_MAGIC ('s', 'r', 'c', 'z', 'o', 'h')
typedef struct
{ int zoh_magic_marker ;
int dirty ;
long in_count, in_used ;
long out_count, out_gen ;
float *last_value ;
} ZOH_DATA ;
static SRC_STATE_VT zoh_state_vt =
{
zoh_vari_process,
zoh_vari_process,
zoh_reset,
zoh_copy,
zoh_close
} ;
/*----------------------------------------------------------------------------------------
*/
static SRC_ERROR
zoh_vari_process (SRC_STATE *state, 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 (state->private_data == NULL)
return SRC_ERR_NO_PRIVATE ;
priv = (ZOH_DATA*) state->private_data ;
if (!priv->dirty)
{ /* If we have just been reset, set the last_value data. */
for (ch = 0 ; ch < state->channels ; ch++)
priv->last_value [ch] = data->data_in [ch] ;
priv->dirty = 1 ;
} ;
priv->in_count = data->input_frames * state->channels ;
priv->out_count = data->output_frames * state->channels ;
priv->in_used = priv->out_gen = 0 ;
src_ratio = state->last_ratio ;
if (is_bad_src_ratio (src_ratio))
return SRC_ERR_BAD_INTERNAL_STATE ;
input_index = state->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 + state->channels * input_index >= priv->in_count)
break ;
if (priv->out_count > 0 && fabs (state->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
src_ratio = state->last_ratio + priv->out_gen * (data->src_ratio - state->last_ratio) / priv->out_count ;
for (ch = 0 ; ch < state->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 += state->channels * psf_lrint (input_index - rem) ;
input_index = rem ;
/* Main processing loop. */
while (priv->out_gen < priv->out_count && priv->in_used + state->channels * input_index <= priv->in_count)
{
if (priv->out_count > 0 && fabs (state->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
src_ratio = state->last_ratio + priv->out_gen * (data->src_ratio - state->last_ratio) / priv->out_count ;
for (ch = 0 ; ch < state->channels ; ch++)
{ data->data_out [priv->out_gen] = data->data_in [priv->in_used - state->channels + ch] ;
priv->out_gen ++ ;
} ;
/* Figure out the next index. */
input_index += 1.0 / src_ratio ;
rem = fmod_one (input_index) ;
priv->in_used += state->channels * psf_lrint (input_index - rem) ;
input_index = rem ;
} ;
if (priv->in_used > priv->in_count)
{ input_index += (priv->in_used - priv->in_count) / state->channels ;
priv->in_used = priv->in_count ;
} ;
state->last_position = input_index ;
if (priv->in_used > 0)
for (ch = 0 ; ch < state->channels ; ch++)
priv->last_value [ch] = data->data_in [priv->in_used - state->channels + ch] ;
/* Save current ratio rather then target ratio. */
state->last_ratio = src_ratio ;
data->input_frames_used = priv->in_used / state->channels ;
data->output_frames_gen = priv->out_gen / state->channels ;
return SRC_ERR_NO_ERROR ;
} /* zoh_vari_process */
/*------------------------------------------------------------------------------
*/
LIBSAMPLERATE_DLL_PRIVATE const char*
zoh_get_name (int src_enum)
{
if (src_enum == SRC_ZERO_ORDER_HOLD)
return "ZOH Interpolator" ;
return NULL ;
} /* zoh_get_name */
LIBSAMPLERATE_DLL_PRIVATE 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 */
static ZOH_DATA *
zoh_data_new (int channels)
{
assert (channels > 0) ;
ZOH_DATA *priv = (ZOH_DATA *) calloc (1, sizeof (ZOH_DATA)) ;
if (priv)
{
priv->zoh_magic_marker = ZOH_MAGIC_MARKER ;
priv->last_value = (float *) calloc (channels, sizeof (float)) ;
if (!priv->last_value)
{
free (priv) ;
priv = NULL ;
}
}
return priv ;
}
LIBSAMPLERATE_DLL_PRIVATE SRC_STATE *
zoh_state_new (int channels, SRC_ERROR *error)
{
assert (channels > 0) ;
assert (error != NULL) ;
SRC_STATE *state = (SRC_STATE *) calloc (1, sizeof (SRC_STATE)) ;
if (!state)
{
*error = SRC_ERR_MALLOC_FAILED ;
return NULL ;
}
state->channels = channels ;
state->mode = SRC_MODE_PROCESS ;
state->private_data = zoh_data_new (state->channels) ;
if (!state->private_data)
{
free (state) ;
*error = SRC_ERR_MALLOC_FAILED ;
return NULL ;
}
state->vt = &zoh_state_vt ;
zoh_reset (state) ;
*error = SRC_ERR_NO_ERROR ;
return state ;
}
/*===================================================================================
*/
static void
zoh_reset (SRC_STATE *state)
{ ZOH_DATA *priv ;
priv = (ZOH_DATA*) state->private_data ;
if (priv == NULL)
return ;
priv->dirty = 0 ;
memset (priv->last_value, 0, sizeof (float) * state->channels) ;
return ;
} /* zoh_reset */
static SRC_STATE *
zoh_copy (SRC_STATE *state)
{
assert (state != NULL) ;
if (state->private_data == NULL)
return NULL ;
SRC_STATE *to = (SRC_STATE *) calloc (1, sizeof (SRC_STATE)) ;
if (!to)
return NULL ;
memcpy (to, state, sizeof (SRC_STATE)) ;
ZOH_DATA* from_priv = (ZOH_DATA*) state->private_data ;
ZOH_DATA *to_priv = (ZOH_DATA *) calloc (1, sizeof (ZOH_DATA)) ;
if (!to_priv)
{
free (to) ;
return NULL ;
}
memcpy (to_priv, from_priv, sizeof (ZOH_DATA)) ;
to_priv->last_value = (float *) malloc (sizeof (float) * state->channels) ;
if (!to_priv->last_value)
{
free (to) ;
free (to_priv) ;
return NULL ;
}
memcpy (to_priv->last_value, from_priv->last_value, sizeof (float) * state->channels) ;
to->private_data = to_priv ;
return to ;
} /* zoh_copy */
static void
zoh_close (SRC_STATE *state)
{
if (state)
{
ZOH_DATA *zoh = (ZOH_DATA *) state->private_data ;
if (zoh)
{
if (zoh->last_value)
{
free (zoh->last_value) ;
zoh->last_value = NULL ;
}
free (zoh) ;
zoh = NULL ;
}
free (state) ;
state = NULL ;
}
} /* zoh_close */