vp9_filter.h 1.6 KB
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/*
 *  Copyright (c) 2011 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.
 */

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#ifndef VP9_COMMON_VP9_FILTER_H_
#define VP9_COMMON_VP9_FILTER_H_
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#include "./vpx_config.h"
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#include "vpx/vpx_integer.h"
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#ifdef __cplusplus
extern "C" {
#endif

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#define FILTER_BITS 7

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#define SUBPEL_BITS 4
#define SUBPEL_MASK ((1 << SUBPEL_BITS) - 1)
#define SUBPEL_SHIFTS (1 << SUBPEL_BITS)
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#define SUBPEL_TAPS 8
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typedef enum {
  EIGHTTAP = 0,
  EIGHTTAP_SMOOTH = 1,
  EIGHTTAP_SHARP = 2,
  BILINEAR = 3,
  SWITCHABLE = 4  /* should be the last one */
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} INTERPOLATION_TYPE;
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typedef int16_t subpel_kernel[SUBPEL_TAPS];
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struct subpix_fn_table {
  const subpel_kernel *filter_x;
  const subpel_kernel *filter_y;
};

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const subpel_kernel *vp9_get_filter_kernel(INTERPOLATION_TYPE type);
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extern const subpel_kernel vp9_bilinear_filters[SUBPEL_SHIFTS];
extern const subpel_kernel vp9_sub_pel_filters_8[SUBPEL_SHIFTS];
extern const subpel_kernel vp9_sub_pel_filters_8s[SUBPEL_SHIFTS];
extern const subpel_kernel vp9_sub_pel_filters_8lp[SUBPEL_SHIFTS];
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// The VP9_BILINEAR_FILTERS_2TAP macro returns a pointer to the bilinear
// filter kernel as a 2 tap filter.
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#define BILINEAR_FILTERS_2TAP(x) \
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  (vp9_bilinear_filters[(x)] + SUBPEL_TAPS/2 - 1)
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#ifdef __cplusplus
}  // extern "C"
#endif

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#endif  // VP9_COMMON_VP9_FILTER_H_