ref: a4525dccec0cbd23b507cb58ce6d8b24a3dd4559
dir: /vpx_dsp/vpx_filter.h/
/*
* Copyright (c) 2015 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef VPX_VPX_DSP_VPX_FILTER_H_
#define VPX_VPX_DSP_VPX_FILTER_H_
#include <assert.h>
#include "vpx/vpx_integer.h"
#ifdef __cplusplus
extern "C" {
#endif
#define FILTER_BITS 7
#define SUBPEL_BITS 4
#define SUBPEL_MASK ((1 << SUBPEL_BITS) - 1)
#define SUBPEL_SHIFTS (1 << SUBPEL_BITS)
#define SUBPEL_TAPS 8
typedef int16_t InterpKernel[SUBPEL_TAPS];
static INLINE int vpx_get_filter_taps(const int16_t *const filter) {
assert(filter[3] != 128);
if (!filter[0] && !filter[1] && !filter[2])
return 2;
else
return 8;
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VPX_VPX_DSP_VPX_FILTER_H_