/*
 * Copyright (c) 2016 Alexandra Hájková
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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.
 */

#include <string.h>

#include "libavutil/intreadwrite.h"
#include "libavutil/mem_internal.h"

#include "libavcodec/hevcdsp.h"

#include "checkasm.h"

#define randomize_buffers(buf, size)            \
    do {                                        \
        int j;                                  \
        for (j = 0; j < size; j++) {            \
            int16_t r = rnd();                  \
            AV_WN16A(buf + j, r);               \
        }                                       \
    } while (0)

static void check_idct(HEVCDSPContext *h, int bit_depth)
{
    int i;
    LOCAL_ALIGNED(32, int16_t, coeffs0, [32 * 32]);
    LOCAL_ALIGNED(32, int16_t, coeffs1, [32 * 32]);

    for (i = 2; i <= 5; i++) {
        int block_size = 1 << i;
        int size = block_size * block_size;
        int col_limit = block_size;
        declare_func(void, int16_t *coeffs, int col_limit);

        randomize_buffers(coeffs0, size);
        memcpy(coeffs1, coeffs0, sizeof(*coeffs0) * size);
        if (check_func(h->idct[i - 2], "hevc_idct_%dx%d_%d", block_size, block_size, bit_depth)) {
            call_ref(coeffs0, col_limit);
            call_new(coeffs1, col_limit);
            if (memcmp(coeffs0, coeffs1, sizeof(*coeffs0) * size))
                fail();
            bench_new(coeffs1, col_limit);
        }
    }
}

static void check_idct_dc(HEVCDSPContext *h, int bit_depth)
{
    int i;
    LOCAL_ALIGNED(32, int16_t, coeffs0, [32 * 32]);
    LOCAL_ALIGNED(32, int16_t, coeffs1, [32 * 32]);

    for (i = 2; i <= 5; i++) {
        int block_size = 1 << i;
        int size = block_size * block_size;
        declare_func_emms(AV_CPU_FLAG_MMXEXT, void, int16_t *coeffs);

        randomize_buffers(coeffs0, size);
        memcpy(coeffs1, coeffs0, sizeof(*coeffs0) * size);

        if (check_func(h->idct_dc[i - 2], "hevc_idct_%dx%d_dc_%d", block_size, block_size, bit_depth)) {
            call_ref(coeffs0);
            call_new(coeffs1);
            if (memcmp(coeffs0, coeffs1, sizeof(*coeffs0) * size))
                fail();
            bench_new(coeffs1);
        }
    }
}

static void check_transform_luma(HEVCDSPContext *h, int bit_depth)
{
    LOCAL_ALIGNED(32, int16_t, coeffs0, [32 * 32]);
    LOCAL_ALIGNED(32, int16_t, coeffs1, [32 * 32]);

    int block_size = 4;
    int size = block_size * block_size;
    declare_func(void, int16_t *coeffs);

    randomize_buffers(coeffs0, size);
    memcpy(coeffs1, coeffs0, sizeof(*coeffs0) * size);

    if (check_func(h->transform_4x4_luma, "hevc_transform_luma_4x4_%d", bit_depth)) {
        call_ref(coeffs0);
        call_new(coeffs1);
        if (memcmp(coeffs0, coeffs1, sizeof(*coeffs0) * size))
            fail();
        bench_new(coeffs1);
    }
}

void checkasm_check_hevc_idct(void)
{
    int bit_depth;

    for (bit_depth = 8; bit_depth <= 12; bit_depth += 2) {
        HEVCDSPContext h;

        ff_hevc_dsp_init(&h, bit_depth);
        check_idct_dc(&h, bit_depth);
    }
    report("idct_dc");

    for (bit_depth = 8; bit_depth <= 12; bit_depth += 2) {
        HEVCDSPContext h;

        ff_hevc_dsp_init(&h, bit_depth);
        check_idct(&h, bit_depth);
    }
    report("idct");

    for (bit_depth = 8; bit_depth <= 12; bit_depth += 2) {
        HEVCDSPContext h;

        ff_hevc_dsp_init(&h, bit_depth);
        check_transform_luma(&h, bit_depth);
    }
    report("transform_luma");
}
