ref: ece924526fe18b0e292df06b86ca11d112f54a79
dir: /src/common.h/
/*
** 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
*/
#ifndef COMMON_H_INCLUDED
#define COMMON_H_INCLUDED
#include <stdint.h>
#include <math.h>
#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))
/*
** Adds casting needed if compiled/included within cpp
*/
#ifdef __cplusplus
#define ZERO_ALLOC(type, size) static_cast<type*>(calloc(1, size))
#else // __cplusplus
#define ZERO_ALLOC(type, size) calloc(1, size)
#endif
/*
** 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
} ;
struct SRC_STATE_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) (SRC_STATE *state, SRC_DATA *data) ;
/* Constant speed process function. */
int (*const_process) (SRC_STATE *state, SRC_DATA *data) ;
/* State reset. */
void (*reset) (SRC_STATE *state) ;
/* State clone. */
int (*copy) (SRC_STATE *from, SRC_STATE *to) ;
/* Data specific to SRC_MODE_CALLBACK. */
src_callback_t callback_func ;
void *user_callback_data ;
long saved_frames ;
const float *saved_data ;
} ;
/* 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_STATE *state, 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_STATE *state, 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_STATE *state, 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 */