/*
 *  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 MAX_SUBPEL_TAPS    12
#define SUPPORT_NONINTERPOLATING_FILTERS 0  /* turn it on for experimentation */
#define SWITCHABLE_FILTERS  5 /* Number of switchable filters */

#if SWITCHABLE_FILTERS >= 4
#define EIGHTTAP_SMOOTH2    3
#endif
#if SWITCHABLE_FILTERS == 5
#define MULTITAP_SHARP2     4
#endif  // 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 */
#define SWITCHABLE_FILTER_CONTEXTS (SWITCHABLE_FILTERS + 1)

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

#endif  // VP10_COMMON_FILTER_H_