1 /* 2 * Copyright (c) 2015 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef VPX_VPX_DSP_VPX_FILTER_H_ 12 #define VPX_VPX_DSP_VPX_FILTER_H_ 13 14 #include <assert.h> 15 #include "vpx/vpx_integer.h" 16 17 #ifdef __cplusplus 18 extern "C" { 19 #endif 20 21 #define FILTER_BITS 7 22 23 #define SUBPEL_BITS 4 24 #define SUBPEL_MASK ((1 << SUBPEL_BITS) - 1) 25 #define SUBPEL_SHIFTS (1 << SUBPEL_BITS) 26 #define SUBPEL_TAPS 8 27 28 typedef int16_t InterpKernel[SUBPEL_TAPS]; 29 vpx_get_filter_taps(const int16_t * const filter)30static INLINE int vpx_get_filter_taps(const int16_t *const filter) { 31 assert(filter[3] != 128); 32 if (!filter[0] && !filter[1] && !filter[2]) 33 return 2; 34 else 35 return 8; 36 } 37 38 #ifdef __cplusplus 39 } // extern "C" 40 #endif 41 42 #endif // VPX_VPX_DSP_VPX_FILTER_H_ 43