Initial commit

dep/libsamplerate/src/common.h

@@ -0,0 +1,160 @@
+/*
+** 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 */
+

dep/libsamplerate/src/float_cast.h

@@ -0,0 +1,271 @@
+/*
+** 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)) && !defined(__MINGW64__)
+
+	/*	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)) && !defined(__MINGW32__)
+
+	#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 */
+

dep/libsamplerate/src/samplerate.c

@@ -0,0 +1,540 @@
+/*
+** 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 */
+

dep/libsamplerate/src/src_linear.c

@@ -0,0 +1,209 @@
+/*
+** 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 */
+

dep/libsamplerate/src/src_zoh.c

@@ -0,0 +1,200 @@
+/*
+** 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 */
+