Line data    Source code

       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_DSP_VPX_FILTER_H_
      12             : #define VPX_DSP_VPX_FILTER_H_
      13             : 
      14             : #include "vpx/vpx_integer.h"
      15             : 
      16             : #ifdef __cplusplus
      17             : extern "C" {
      18             : #endif
      19             : 
      20             : #define FILTER_BITS 7
      21             : 
      22             : #define SUBPEL_BITS 4
      23             : #define SUBPEL_MASK ((1 << SUBPEL_BITS) - 1)
      24             : #define SUBPEL_SHIFTS (1 << SUBPEL_BITS)
      25             : #define SUBPEL_TAPS 8
      26             : 
      27             : typedef int16_t InterpKernel[SUBPEL_TAPS];
      28             : 
      29           0 : static INLINE const InterpKernel *get_filter_base(const int16_t *filter) {
      30             :   // NOTE: This assumes that the filter table is 256-byte aligned.
      31             :   // TODO(agrange) Modify to make independent of table alignment.
      32           0 :   return (const InterpKernel *)(((intptr_t)filter) & ~((intptr_t)0xFF));
      33             : }
      34             : 
      35           0 : static INLINE int get_filter_offset(const int16_t *f,
      36             :                                     const InterpKernel *base) {
      37           0 :   return (int)((const InterpKernel *)(intptr_t)f - base);
      38             : }
      39             : 
      40             : #ifdef __cplusplus
      41             : }  // extern "C"
      42             : #endif
      43             : 
      44             : #endif  // VPX_DSP_VPX_FILTER_H_