vp10/common/filter.h

/*
 *  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.
 */

#ifndef VP10_COMMON_FILTER_H_
#define VP10_COMMON_FILTER_H_

#include "./vpx_config.h"
#include "vpx/vpx_integer.h"
#include "vpx_dsp/vpx_filter.h"
#include "vpx_ports/mem.h"


#ifdef __cplusplus
extern "C" {
#endif

#define EIGHTTAP_REGULAR    0
#define EIGHTTAP_SMOOTH     1
#define MULTITAP_SHARP      2

#if CONFIG_EXT_INTERP
#define EIGHTTAP_SMOOTH2    3
#define MULTITAP_SHARP2     4

#define MAX_SUBPEL_TAPS    12

#define SUPPORT_NONINTERPOLATING_FILTERS 0  /* turn it on for experimentation */
#define SWITCHABLE_FILTERS  5 /* Number of switchable filters */
#else
#define SWITCHABLE_FILTERS  3 /* Number of switchable filters */
#endif  // CONFIG_EXT_INTERP

#define USE_TEMPORALFILTER_12TAP 1
#if USE_TEMPORALFILTER_12TAP
#define TEMPORALFILTER_12TAP (SWITCHABLE_FILTERS + 1)
#endif

// The codec can operate in four possible inter prediction filter mode:
// 8-tap, 8-tap-smooth, 8-tap-sharp, and switching between the three.

#define BILINEAR            (SWITCHABLE_FILTERS)
#define SWITCHABLE          (SWITCHABLE_FILTERS + 1)  /* the last one */
#if CONFIG_DUAL_FILTER
#define SWITCHABLE_FILTER_CONTEXTS ((SWITCHABLE_FILTERS + 1) * 4)
#define INTER_FILTER_COMP_OFFSET   (SWITCHABLE_FILTERS + 1)
#define INTER_FILTER_DIR_OFFSET    ((SWITCHABLE_FILTERS + 1) * 2)
#else
#define SWITCHABLE_FILTER_CONTEXTS (SWITCHABLE_FILTERS + 1)
#endif

typedef uint8_t INTERP_FILTER;

#if CONFIG_EXT_INTRA
typedef enum {
  INTRA_FILTER_LINEAR,
  INTRA_FILTER_8TAP,
  INTRA_FILTER_8TAP_SHARP,
  INTRA_FILTER_8TAP_SMOOTH,
  INTRA_FILTERS,
} INTRA_FILTER;

extern const InterpKernel *vp10_intra_filter_kernels[INTRA_FILTERS];
#endif  // CONFIG_EXT_INTRA

typedef struct InterpFilterParams {
  const int16_t* filter_ptr;
  uint16_t taps;
  uint16_t subpel_shifts;
} InterpFilterParams;

InterpFilterParams vp10_get_interp_filter_params(
    const INTERP_FILTER interp_filter);

const int16_t *vp10_get_interp_filter_kernel(
    const INTERP_FILTER interp_filter);

static INLINE const int16_t* vp10_get_interp_filter_subpel_kernel(
    const InterpFilterParams filter_params, const int subpel) {
  return filter_params.filter_ptr + filter_params.taps * subpel;
}

static INLINE int vp10_is_interpolating_filter(
    const INTERP_FILTER interp_filter) {
  const InterpFilterParams ip = vp10_get_interp_filter_params(interp_filter);
  return (ip.filter_ptr[ip.taps / 2 - 1] == 128);
}

#if USE_TEMPORALFILTER_12TAP
extern const int8_t sub_pel_filters_temporalfilter_12_signal_dir[15][2][16];
extern const int8_t sub_pel_filters_temporalfilter_12_ver_signal_dir[15][6][16];
#if CONFIG_VP9_HIGHBITDEPTH
extern const
int16_t sub_pel_filters_temporalfilter_12_highbd_ver_signal_dir[15][6][8];
#endif
#endif

#if CONFIG_EXT_INTERP
extern const int8_t sub_pel_filters_12sharp_signal_dir[15][2][16];
extern const int8_t sub_pel_filters_10sharp_signal_dir[15][2][16];
extern const int8_t sub_pel_filters_12sharp_ver_signal_dir[15][6][16];
extern const int8_t sub_pel_filters_10sharp_ver_signal_dir[15][6][16];
#if CONFIG_VP9_HIGHBITDEPTH
extern const int16_t sub_pel_filters_12sharp_highbd_ver_signal_dir[15][6][8];
extern const int16_t sub_pel_filters_10sharp_highbd_ver_signal_dir[15][6][8];
#endif
#endif

typedef const int8_t (*SubpelFilterCoeffs)[16];
#if CONFIG_VP9_HIGHBITDEPTH
typedef const int16_t (*HbdSubpelFilterCoeffs)[8];
#endif

SubpelFilterCoeffs vp10_get_subpel_filter_signal_dir(
    const InterpFilterParams p, int index);

SubpelFilterCoeffs vp10_get_subpel_filter_ver_signal_dir(
    const InterpFilterParams p, int index);
#if CONFIG_VP9_HIGHBITDEPTH
HbdSubpelFilterCoeffs vp10_hbd_get_subpel_filter_ver_signal_dir(
    const InterpFilterParams p, int index);
#endif

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // VP10_COMMON_FILTER_H_