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/*
* i965_vpp_avs.h - Adaptive Video Scaler (AVS) block
*
* Copyright (C) 2014 Intel Corporation
* Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef I965_VPP_AVS_H
#define I965_VPP_AVS_H
#include <stdint.h>
#include <stdbool.h>
/** Maximum number of phases for the sharp filter */
#define AVS_MAX_PHASES 32
/** Maximum number of coefficients for luma samples */
#define AVS_MAX_LUMA_COEFFS 8
/** Maximum number of coefficients for chroma samples */
#define AVS_MAX_CHROMA_COEFFS 4
typedef struct avs_coeffs AVSCoeffs;
typedef struct avs_coeffs_range AVSCoeffsRange;
typedef struct avs_config AVSConfig;
typedef struct avs_state AVSState;
/** AVS coefficients for one phase */
struct avs_coeffs {
/** Coefficients for luma samples on the X-axis (horizontal) */
float y_k_h[AVS_MAX_LUMA_COEFFS];
/** Coefficients for luma samples on the Y-axis (vertical) */
float y_k_v[AVS_MAX_LUMA_COEFFS];
/** Coefficients for chroma samples on the X-axis (horizontal) */
float uv_k_h[AVS_MAX_CHROMA_COEFFS];
/** Coefficients for chroma samples on the Y-axis (vertical) */
float uv_k_v[AVS_MAX_CHROMA_COEFFS];
};
/** AVS coefficients range used for validation */
struct avs_coeffs_range {
/** Lower bound for all coefficients */
AVSCoeffs lower_bound;
/** Upper bound for all coefficients */
AVSCoeffs upper_bound;
};
/** Static configuration (per-generation) */
struct avs_config {
/** Number of bits used for the fractional part of a coefficient */
int coeff_frac_bits;
/** The smallest float that could be represented as a coefficient */
float coeff_epsilon;
/** Coefficients range */
AVSCoeffsRange coeff_range;
/** Number of phases for the sharp filter */
int num_phases;
/** Number of coefficients for luma samples */
int num_luma_coeffs;
/** Number of coefficients for chroma samples */
int num_chroma_coeffs;
};
/** AVS block state */
struct avs_state {
/** Per-generation configuration parameters */
const AVSConfig *config;
/** Scaling flags */
uint32_t flags;
/** Scaling factor on the X-axis (horizontal) */
float scale_x;
/** Scaling factor on the Y-axis (vertical) */
float scale_y;
/** Coefficients for the polyphase scaler */
AVSCoeffs coeffs[AVS_MAX_PHASES + 1];
};
/** Initializes AVS state with the supplied configuration */
void
avs_init_state(AVSState *avs, const AVSConfig *config);
/** Updates AVS coefficients for the supplied factors and quality level */
bool
avs_update_coefficients(AVSState *avs, float sx, float sy, uint32_t flags);
/** Checks whether AVS is needed, e.g. if high-quality scaling is requested */
static inline bool
avs_is_needed(uint32_t flags)
{
return ((flags & VA_FILTER_SCALING_MASK) >= VA_FILTER_SCALING_HQ);
}
#endif /* I965_VPP_AVS_H */
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