sdk/lib/3rdparty/libsamplerate/common.h

   1 /*
   2 ** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
   3 ** All rights reserved.
   4 **
   5 ** This code is released under 2-clause BSD license. Please see the
   6 ** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
   7 */
   8
   9 #ifndef COMMON_H_INCLUDED
  10 #define COMMON_H_INCLUDED
  11
  12 #ifdef HAVE_STDINT_H
  13 #include <stdint.h>
  14 #elif (SIZEOF_INT == 4)
  15 typedef int             int32_t ;
  16 #elif (SIZEOF_LONG == 4)
  17 typedef long    int32_t ;
  18 #endif
  19
  20 #define SRC_MAX_RATIO                   256
  21 #define SRC_MAX_RATIO_STR               "256"
  22
  23 #define SRC_MIN_RATIO_DIFF              (1e-20)
  24
  25 #define MAX(a,b)        (((a) > (b)) ? (a) : (b))
  26 #define MIN(a,b)        (((a) < (b)) ? (a) : (b))
  27
  28 #define ARRAY_LEN(x)                    ((int) (sizeof (x) / sizeof ((x) [0])))
  29 #define OFFSETOF(type,member)   ((int) (&((type*) 0)->member))
  30
  31 #define MAKE_MAGIC(a,b,c,d,e,f) ((a) + ((b) << 4) + ((c) << 8) + ((d) << 12) + ((e) << 16) + ((f) << 20))
  32
  33 /*
  34 ** Inspiration : http://sourcefrog.net/weblog/software/languages/C/unused.html
  35 */
  36 #ifdef UNUSED
  37 #elif defined (__GNUC__)
  38 #       define UNUSED(x) UNUSED_ ## x __attribute__ ((unused))
  39 #elif defined (__LCLINT__)
  40 #       define UNUSED(x) /*@unused@*/ x
  41 #else
  42 #       define UNUSED(x) x
  43 #endif
  44
  45 #ifdef __GNUC__
  46 #       define WARN_UNUSED      __attribute__ ((warn_unused_result))
  47 #else
  48 #       define WARN_UNUSED
  49 #endif
  50
  51
  52 #include "samplerate.h"
  53
  54 enum
  55 {       SRC_FALSE       = 0,
  56         SRC_TRUE        = 1,
  57
  58         SRC_MODE_PROCESS        = 555,
  59         SRC_MODE_CALLBACK       = 556
  60 } ;
  61
  62 enum
  63 {       SRC_ERR_NO_ERROR = 0,
  64
  65         SRC_ERR_MALLOC_FAILED,
  66         SRC_ERR_BAD_STATE,
  67         SRC_ERR_BAD_DATA,
  68         SRC_ERR_BAD_DATA_PTR,
  69         SRC_ERR_NO_PRIVATE,
  70         SRC_ERR_BAD_SRC_RATIO,
  71         SRC_ERR_BAD_PROC_PTR,
  72         SRC_ERR_SHIFT_BITS,
  73         SRC_ERR_FILTER_LEN,
  74         SRC_ERR_BAD_CONVERTER,
  75         SRC_ERR_BAD_CHANNEL_COUNT,
  76         SRC_ERR_SINC_BAD_BUFFER_LEN,
  77         SRC_ERR_SIZE_INCOMPATIBILITY,
  78         SRC_ERR_BAD_PRIV_PTR,
  79         SRC_ERR_BAD_SINC_STATE,
  80         SRC_ERR_DATA_OVERLAP,
  81         SRC_ERR_BAD_CALLBACK,
  82         SRC_ERR_BAD_MODE,
  83         SRC_ERR_NULL_CALLBACK,
  84         SRC_ERR_NO_VARIABLE_RATIO,
  85         SRC_ERR_SINC_PREPARE_DATA_BAD_LEN,
  86         SRC_ERR_BAD_INTERNAL_STATE,
  87
  88         /* This must be the last error number. */
  89         SRC_ERR_MAX_ERROR
  90 } ;
  91
  92 typedef struct SRC_PRIVATE_tag
  93 {       double  last_ratio, last_position ;
  94
  95         int             error ;
  96         int             channels ;
  97
  98         /* SRC_MODE_PROCESS or SRC_MODE_CALLBACK */
  99         int             mode ;
 100
 101         /* Pointer to data to converter specific data. */
 102         void    *private_data ;
 103
 104         /* Varispeed process function. */
 105         int             (*vari_process) (struct SRC_PRIVATE_tag *psrc, SRC_DATA *data) ;
 106
 107         /* Constant speed process function. */
 108         int             (*const_process) (struct SRC_PRIVATE_tag *psrc, SRC_DATA *data) ;
 109
 110         /* State reset. */
 111         void    (*reset) (struct SRC_PRIVATE_tag *psrc) ;
 112
 113         /* Data specific to SRC_MODE_CALLBACK. */
 114         src_callback_t  callback_func ;
 115         void                    *user_callback_data ;
 116         long                    saved_frames ;
 117         const float             *saved_data ;
 118 } SRC_PRIVATE ;
 119
 120 /* In src_sinc.c */
 121 const char* sinc_get_name (int src_enum) ;
 122 const char* sinc_get_description (int src_enum) ;
 123
 124 int sinc_set_converter (SRC_PRIVATE *psrc, int src_enum) ;
 125
 126 /* In src_linear.c */
 127 const char* linear_get_name (int src_enum) ;
 128 const char* linear_get_description (int src_enum) ;
 129
 130 int linear_set_converter (SRC_PRIVATE *psrc, int src_enum) ;
 131
 132 /* In src_zoh.c */
 133 const char* zoh_get_name (int src_enum) ;
 134 const char* zoh_get_description (int src_enum) ;
 135
 136 int zoh_set_converter (SRC_PRIVATE *psrc, int src_enum) ;
 137
 138 /*----------------------------------------------------------
 139 **      Common static inline functions.
 140 */
 141
 142 static inline double
 143 fmod_one (double x)
 144 {       double res ;
 145
 146         res = x - lrint (x) ;
 147         if (res < 0.0)
 148                 return res + 1.0 ;
 149
 150         return res ;
 151 } /* fmod_one */
 152
 153 static inline int
 154 is_bad_src_ratio (double ratio)
 155 {       return (ratio < (1.0 / SRC_MAX_RATIO) || ratio > (1.0 * SRC_MAX_RATIO)) ;
 156 } /* is_bad_src_ratio */
 157
 158
 159 #endif  /* COMMON_H_INCLUDED */
 160