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/*
* Copyright (C) 2012 Jamie Bullock
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
/** \file xtract_stateful.h: declares functions that extract features that require stateful data to be retained between frames */
#ifndef XTRACT_STATEFUL_H
#define XTRACT_STATEFUL_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* \defgroup stateful feature extraction functions and data structures
*
* Functions that extract a feature over multiple frames
*
* @{
*/
#include <stdint.h>
#include <string.h>
struct ringbuf_t;
typedef struct ringbuf_t *ringbuf_t;
typedef struct xtract_last_n_state_ xtract_last_n_state;
xtract_last_n_state *xtract_last_n_state_new(size_t capacity);
void xtract_last_n_state_delete(xtract_last_n_state *last_n_state);
/**
* Write a vector of the last N input values to `result`
*
* @param state a pointer to an xtract_peak_picker_state struct as allocated by xtract_peak_picker_state_new()
* @param data a pointer to a double representing the current input value
* @param N an integer representing 'N' the number of values to be written to *result
* @param argv a pointer to NULL
* @param result a pointer to an array of doubles representing the last N values, where the nth value is the current one. The array must have been allocated to size N elements and initialised by the caller
*
*/
int xtract_last_n(const xtract_last_n_state *state, const double *data, const int N, const void *argv, double *result);
#endif
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