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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.
*
*/
/* stateful.c: declares functions that extract features that require stateful data to be retained between frames */
#include "../xtract/xtract_stateful.h"
#include "../xtract/libxtract.h"
#include "c-ringbuf/ringbuf.h"
#include <stdlib.h>
#include <stdio.h>
#include <float.h>
struct xtract_last_n_state_
{
ringbuf_t ringbuf;
};
xtract_last_n_state *xtract_last_n_state_new(size_t N)
{
xtract_last_n_state *last_n_state = malloc(sizeof(xtract_last_n_state));
if (last_n_state == NULL)
{
perror("could not allocate memory for xtract_last_n_state");
return NULL;
}
last_n_state->ringbuf = ringbuf_new(N * sizeof(double));
if (last_n_state->ringbuf == NULL)
{
perror("could not allocate memory for xtract_last_n_state->ringbuf");
}
return last_n_state;
}
void xtract_last_n_state_delete(xtract_last_n_state *last_n_state)
{
ringbuf_free(&last_n_state->ringbuf);
free(last_n_state);
}
int xtract_last_n(const xtract_last_n_state *state, const double *data, const int N, const void *argv, double *result)
{
size_t N_bytes = N * sizeof(double);
if (N_bytes != ringbuf_capacity(state->ringbuf))
{
fprintf(stderr, "libxtract: error: xtract_last_n(): inconsitent size");
return XTRACT_BAD_STATE;
}
ringbuf_memcpy_into(state->ringbuf, data, sizeof(double));
size_t used = ringbuf_bytes_used(state->ringbuf);
ringbuf_memcpy_from(result, state->ringbuf, used, false);
if (used < N_bytes)
{
/* zero pad */
for (size_t n = used / sizeof(double); n < N; ++n)
{
result[n] = 0.0;
}
}
return XTRACT_SUCCESS;
}
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