219 lines
4.7 KiB
C
219 lines
4.7 KiB
C
/*
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** Copyright (c) 2002-2021, Erik de Castro Lopo <erikd@mega-nerd.com>
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** All rights reserved.
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**
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** This code is released under 2-clause BSD license. Please see the
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** file at : https://github.com/libsndfile/libsamplerate/blob/master/COPYING
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*/
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#ifndef COMMON_H_INCLUDED
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#define COMMON_H_INCLUDED
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#include <stdint.h>
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#ifdef HAVE_STDBOOL_H
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#include <stdbool.h>
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#endif
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#if HAVE_IMMINTRIN_H
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#include <immintrin.h>
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#endif
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/* Uncomment to enable specific converters */
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//#define ENABLE_SINC_BEST_CONVERTER
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//#define ENABLE_SINC_FAST_CONVERTER
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//#define ENABLE_SINC_MEDIUM_CONVERTER
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#include <math.h>
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#ifdef HAVE_VISIBILITY
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#define LIBSAMPLERATE_DLL_PRIVATE __attribute__ ((visibility ("hidden")))
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#elif defined (__APPLE__)
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#define LIBSAMPLERATE_DLL_PRIVATE __private_extern__
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#else
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#define LIBSAMPLERATE_DLL_PRIVATE
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#endif
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#define SRC_MAX_RATIO 256
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#define SRC_MAX_RATIO_STR "256"
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#define SRC_MIN_RATIO_DIFF (1e-20)
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#ifndef MAX
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#define MAX(a,b) (((a) > (b)) ? (a) : (b))
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#endif
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#ifndef MIN
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#define MIN(a,b) (((a) < (b)) ? (a) : (b))
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#endif
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#define ARRAY_LEN(x) ((int) (sizeof (x) / sizeof ((x) [0])))
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#define OFFSETOF(type,member) ((int) (&((type*) 0)->member))
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#define MAKE_MAGIC(a,b,c,d,e,f) ((a) + ((b) << 4) + ((c) << 8) + ((d) << 12) + ((e) << 16) + ((f) << 20))
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/*
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** Inspiration : http://sourcefrog.net/weblog/software/languages/C/unused.html
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*/
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#ifdef UNUSED
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#elif defined (__GNUC__)
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# define UNUSED(x) UNUSED_ ## x __attribute__ ((unused))
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#elif defined (__LCLINT__)
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# define UNUSED(x) /*@unused@*/ x
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#else
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# define UNUSED(x) x
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#endif
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#ifdef __GNUC__
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# define WARN_UNUSED __attribute__ ((warn_unused_result))
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#else
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# define WARN_UNUSED
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#endif
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#include "samplerate.h"
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enum
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{ SRC_FALSE = 0,
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SRC_TRUE = 1,
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} ;
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enum SRC_MODE
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{
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SRC_MODE_PROCESS = 0,
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SRC_MODE_CALLBACK = 1
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} ;
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typedef enum SRC_ERROR
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{
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SRC_ERR_NO_ERROR = 0,
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SRC_ERR_MALLOC_FAILED,
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SRC_ERR_BAD_STATE,
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SRC_ERR_BAD_DATA,
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SRC_ERR_BAD_DATA_PTR,
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SRC_ERR_NO_PRIVATE,
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SRC_ERR_BAD_SRC_RATIO,
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SRC_ERR_BAD_PROC_PTR,
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SRC_ERR_SHIFT_BITS,
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SRC_ERR_FILTER_LEN,
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SRC_ERR_BAD_CONVERTER,
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SRC_ERR_BAD_CHANNEL_COUNT,
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SRC_ERR_SINC_BAD_BUFFER_LEN,
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SRC_ERR_SIZE_INCOMPATIBILITY,
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SRC_ERR_BAD_PRIV_PTR,
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SRC_ERR_BAD_SINC_STATE,
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SRC_ERR_DATA_OVERLAP,
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SRC_ERR_BAD_CALLBACK,
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SRC_ERR_BAD_MODE,
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SRC_ERR_NULL_CALLBACK,
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SRC_ERR_NO_VARIABLE_RATIO,
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SRC_ERR_SINC_PREPARE_DATA_BAD_LEN,
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SRC_ERR_BAD_INTERNAL_STATE,
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/* This must be the last error number. */
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SRC_ERR_MAX_ERROR
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} SRC_ERROR ;
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typedef struct SRC_STATE_VT_tag
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{
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/* Varispeed process function. */
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SRC_ERROR (*vari_process) (SRC_STATE *state, SRC_DATA *data) ;
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/* Constant speed process function. */
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SRC_ERROR (*const_process) (SRC_STATE *state, SRC_DATA *data) ;
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/* State reset. */
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void (*reset) (SRC_STATE *state) ;
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/* State clone. */
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SRC_STATE *(*copy) (SRC_STATE *state) ;
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/* State close. */
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void (*close) (SRC_STATE *state) ;
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} SRC_STATE_VT ;
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struct SRC_STATE_tag
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{
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SRC_STATE_VT *vt ;
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double last_ratio, last_position ;
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SRC_ERROR error ;
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int channels ;
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/* SRC_MODE_PROCESS or SRC_MODE_CALLBACK */
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enum SRC_MODE mode ;
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/* Data specific to SRC_MODE_CALLBACK. */
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src_callback_t callback_func ;
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void *user_callback_data ;
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long saved_frames ;
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const float *saved_data ;
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/* Pointer to data to converter specific data. */
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void *private_data ;
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} ;
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/* In src_sinc.c */
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const char* sinc_get_name (int src_enum) ;
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const char* sinc_get_description (int src_enum) ;
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SRC_STATE *sinc_state_new (int converter_type, int channels, SRC_ERROR *error) ;
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/* In src_linear.c */
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const char* linear_get_name (int src_enum) ;
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const char* linear_get_description (int src_enum) ;
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SRC_STATE *linear_state_new (int channels, SRC_ERROR *error) ;
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/* In src_zoh.c */
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const char* zoh_get_name (int src_enum) ;
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const char* zoh_get_description (int src_enum) ;
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SRC_STATE *zoh_state_new (int channels, SRC_ERROR *error) ;
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/*----------------------------------------------------------
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** SIMD optimized math functions.
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*/
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static inline int psf_lrintf (float x)
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{
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#ifdef HAVE_IMMINTRIN_H
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return _mm_cvtss_si32 (_mm_load_ss (&x)) ;
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#else
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return lrintf (x) ;
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#endif
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} /* psf_lrintf */
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static inline int psf_lrint (double x)
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{
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#ifdef HAVE_IMMINTRIN_H
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return _mm_cvtsd_si32 (_mm_load_sd (&x)) ;
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#else
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return lrint (x) ;
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#endif
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} /* psf_lrint */
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/*----------------------------------------------------------
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** Common static inline functions.
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*/
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static inline double
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fmod_one (double x)
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{ double res ;
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res = x - psf_lrint (x) ;
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if (res < 0.0)
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return res + 1.0 ;
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return res ;
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} /* fmod_one */
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static inline int
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is_bad_src_ratio (double ratio)
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{ return (ratio < (1.0 / SRC_MAX_RATIO) || ratio > (1.0 * SRC_MAX_RATIO)) ;
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} /* is_bad_src_ratio */
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#endif /* COMMON_H_INCLUDED */
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