1 files changed, 185 insertions, 0 deletions
diff --git a/common.h b/common.h
new file mode 100644
index 000000000000..362b29cfc6db
--- /dev/null
+++ b/common.h
@@ -0,0 +1,185 @@
+/*
+** 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>
+#include <stdbool.h>
+
+#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) ;
+
+/*----------------------------------------------------------
+**	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 */
+