ref: 97b6a6f0374c77a3b23d14247a493ed7966af282
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_DSP_VPX_FILTER_H_
#define VPX_DSP_VPX_FILTER_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 const InterpKernel *get_filter_base(const int16_t *filter) {
// NOTE: This assumes that the filter table is 256-byte aligned.
// TODO(agrange) Modify to make independent of table alignment.
return (const InterpKernel *)(((intptr_t)filter) & ~((intptr_t)0xFF));
}
static INLINE int get_filter_offset(const int16_t *f,
const InterpKernel *base) {
return (int)((const InterpKernel *)(intptr_t)f - base);
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VPX_DSP_VPX_FILTER_H_