/*
 * Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * H.264 DSP functions.
 * @author Michael Niedermayer <michaelni@gmx.at>
 */

#ifndef AVCODEC_H264DSP_H
#define AVCODEC_H264DSP_H

#include <stdint.h>
#include <stddef.h>

typedef void (*h264_weight_func)(uint8_t *block, ptrdiff_t stride, int height,
                                 int log2_denom, int weight, int offset);
typedef void (*h264_biweight_func)(uint8_t *dst, uint8_t *src,
                                   ptrdiff_t stride, int height, int log2_denom,
                                   int weightd, int weights, int offset);

/**
 * Context for storing H.264 DSP functions
 */
typedef struct H264DSPContext {
    /* weighted MC */
    h264_weight_func     weight_pixels_tab[4];
    h264_biweight_func biweight_pixels_tab[4];

    /* loop filter */
    void (*v_loop_filter_luma)(uint8_t *pix /*align 16*/, ptrdiff_t stride,
                               int alpha, int beta, int8_t *tc0);
    void (*h_loop_filter_luma)(uint8_t *pix /*align 4 */, ptrdiff_t stride,
                               int alpha, int beta, int8_t *tc0);
    void (*h_loop_filter_luma_mbaff)(uint8_t *pix /*align 16*/, ptrdiff_t stride,
                                     int alpha, int beta, int8_t *tc0);
    /* v/h_loop_filter_luma_intra: align 16 */
    void (*v_loop_filter_luma_intra)(uint8_t *pix, ptrdiff_t stride,
                                     int alpha, int beta);
    void (*h_loop_filter_luma_intra)(uint8_t *pix, ptrdiff_t stride,
                                     int alpha, int beta);
    void (*h_loop_filter_luma_mbaff_intra)(uint8_t *pix /*align 16*/,
                                           ptrdiff_t stride, int alpha, int beta);
    void (*v_loop_filter_chroma)(uint8_t *pix /*align 8*/, ptrdiff_t stride,
                                 int alpha, int beta, int8_t *tc0);
    void (*h_loop_filter_chroma)(uint8_t *pix /*align 4*/, ptrdiff_t stride,
                                 int alpha, int beta, int8_t *tc0);
    void (*h_loop_filter_chroma_mbaff)(uint8_t *pix /*align 8*/,
                                       ptrdiff_t stride, int alpha, int beta,
                                       int8_t *tc0);
    void (*v_loop_filter_chroma_intra)(uint8_t *pix /*align 8*/,
                                       ptrdiff_t stride, int alpha, int beta);
    void (*h_loop_filter_chroma_intra)(uint8_t *pix /*align 8*/,
                                       ptrdiff_t stride, int alpha, int beta);
    void (*h_loop_filter_chroma_mbaff_intra)(uint8_t *pix /*align 8*/,
                                             ptrdiff_t stride, int alpha, int beta);
    // loop_filter_strength: simd only. the C version is inlined in h264_loopfilter.c
    void (*loop_filter_strength)(int16_t bS[2][4][4], uint8_t nnz[40],
                                 int8_t ref[2][40], int16_t mv[2][40][2],
                                 int bidir, int edges, int step,
                                 int mask_mv0, int mask_mv1, int field);

    /* IDCT */
    void (*idct_add)(uint8_t *dst /*align 4*/,
                     int16_t *block /*align 16*/, int stride);
    void (*idct8_add)(uint8_t *dst /*align 8*/,
                      int16_t *block /*align 16*/, int stride);
    void (*idct_dc_add)(uint8_t *dst /*align 4*/,
                        int16_t *block /*align 16*/, int stride);
    void (*idct8_dc_add)(uint8_t *dst /*align 8*/,
                         int16_t *block /*align 16*/, int stride);

    void (*idct_add16)(uint8_t *dst /*align 16*/, const int *blockoffset,
                       int16_t *block /*align 16*/, int stride,
                       const uint8_t nnzc[5 * 8]);
    void (*idct8_add4)(uint8_t *dst /*align 16*/, const int *blockoffset,
                       int16_t *block /*align 16*/, int stride,
                       const uint8_t nnzc[5 * 8]);
    void (*idct_add8)(uint8_t **dst /*align 16*/, const int *blockoffset,
                      int16_t *block /*align 16*/, int stride,
                      const uint8_t nnzc[15 * 8]);
    void (*idct_add16intra)(uint8_t *dst /*align 16*/, const int *blockoffset,
                            int16_t *block /*align 16*/,
                            int stride, const uint8_t nnzc[5 * 8]);
    void (*luma_dc_dequant_idct)(int16_t *output,
                                 int16_t *input /*align 16*/, int qmul);
    void (*chroma_dc_dequant_idct)(int16_t *block, int qmul);

    /* bypass-transform */
    void (*add_pixels8_clear)(uint8_t *dst, int16_t *block, int stride);
    void (*add_pixels4_clear)(uint8_t *dst, int16_t *block, int stride);

    /**
     * Search buf from the start for up to size bytes. Return the index
     * of a zero byte, or >= size if not found. Ideally, use lookahead
     * to filter out any zero bytes that are known to not be followed by
     * one or more further zero bytes and a one byte. Better still, filter
     * out any bytes that form the trailing_zero_8bits syntax element too.
     */
    int (*startcode_find_candidate)(const uint8_t *buf, int size);
} H264DSPContext;

void ff_h264dsp_init(H264DSPContext *c, const int bit_depth,
                     const int chroma_format_idc);
void ff_h264dsp_init_aarch64(H264DSPContext *c, const int bit_depth,
                             const int chroma_format_idc);
void ff_h264dsp_init_arm(H264DSPContext *c, const int bit_depth,
                         const int chroma_format_idc);
void ff_h264dsp_init_ppc(H264DSPContext *c, const int bit_depth,
                         const int chroma_format_idc);
void ff_h264dsp_init_riscv(H264DSPContext *c, const int bit_depth,
                           const int chroma_format_idc);
void ff_h264dsp_init_x86(H264DSPContext *c, const int bit_depth,
                         const int chroma_format_idc);
void ff_h264dsp_init_mips(H264DSPContext *c, const int bit_depth,
                          const int chroma_format_idc);
void ff_h264dsp_init_loongarch(H264DSPContext *c, const int bit_depth,
                               const int chroma_format_idc);

#endif /* AVCODEC_H264DSP_H */
