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/*

 * AltiVec-enhanced yuv-to-yuv conversion routines.

 *

 * Copyright (C) 2004 Romain Dolbeau 

 * based on the equivalent C code in swscale.c

 *

 * 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

 */

#include 

#include "config.h"

#include "libavutil/attributes.h"

#include "libavutil/cpu.h"

#include "libswscale/swscale.h"

#include "libswscale/swscale_internal.h"

#if HAVE_ALTIVEC

static int yv12toyuy2_unscaled_altivec(SwsContext *c, const uint8_t *src[],

                                       int srcStride[], int srcSliceY,

                                       int srcSliceH, uint8_t *dstParam[],

                                       int dstStride_a[])

{

    uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;

    // yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,

    //            srcStride[0], srcStride[1], dstStride[0]);

    const uint8_t *ysrc   = src[0];

    const uint8_t *usrc   = src[1];

    const uint8_t *vsrc   = src[2];

    const int width       = c->srcW;

    const int height      = srcSliceH;

    const int lumStride   = srcStride[0];

    const int chromStride = srcStride[1];

    const int dstStride   = dstStride_a[0];

    const vector unsigned char yperm = vec_lvsl(0, ysrc);

    const int vertLumPerChroma       = 2;

    register unsigned int y;

    /* This code assumes:

     *

     * 1) dst is 16 bytes-aligned

     * 2) dstStride is a multiple of 16

     * 3) width is a multiple of 16

     * 4) lum & chrom stride are multiples of 8

     */

    for (y = 0; y < height; y++) {

        int i;

        for (i = 0; i < width - 31; i += 32) {

            const unsigned int j          = i >> 1;

            vector unsigned char v_yA     = vec_ld(i, ysrc);

            vector unsigned char v_yB     = vec_ld(i + 16, ysrc);

            vector unsigned char v_yC     = vec_ld(i + 32, ysrc);

            vector unsigned char v_y1     = vec_perm(v_yA, v_yB, yperm);

            vector unsigned char v_y2     = vec_perm(v_yB, v_yC, yperm);

            vector unsigned char v_uA     = vec_ld(j, usrc);

            vector unsigned char v_uB     = vec_ld(j + 16, usrc);

            vector unsigned char v_u      = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));

            vector unsigned char v_vA     = vec_ld(j, vsrc);

            vector unsigned char v_vB     = vec_ld(j + 16, vsrc);

            vector unsigned char v_v      = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));

            vector unsigned char v_uv_a   = vec_mergeh(v_u, v_v);

            vector unsigned char v_uv_b   = vec_mergel(v_u, v_v);

            vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);

            vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);

            vector unsigned char v_yuy2_2 = vec_mergeh(v_y2, v_uv_b);

            vector unsigned char v_yuy2_3 = vec_mergel(v_y2, v_uv_b);

            vec_st(v_yuy2_0, (i << 1), dst);

            vec_st(v_yuy2_1, (i << 1) + 16, dst);

            vec_st(v_yuy2_2, (i << 1) + 32, dst);

            vec_st(v_yuy2_3, (i << 1) + 48, dst);

        }

        if (i < width) {

            const unsigned int j          = i >> 1;

            vector unsigned char v_y1     = vec_ld(i, ysrc);

            vector unsigned char v_u      = vec_ld(j, usrc);

            vector unsigned char v_v      = vec_ld(j, vsrc);

            vector unsigned char v_uv_a   = vec_mergeh(v_u, v_v);

            vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);

            vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);

            vec_st(v_yuy2_0, (i << 1), dst);

            vec_st(v_yuy2_1, (i << 1) + 16, dst);

        }

        if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {

            usrc += chromStride;

            vsrc += chromStride;

        }

        ysrc += lumStride;

        dst  += dstStride;

    }

    return srcSliceH;

}

static int yv12touyvy_unscaled_altivec(SwsContext *c, const uint8_t *src[],

                                       int srcStride[], int srcSliceY,

                                       int srcSliceH, uint8_t *dstParam[],

                                       int dstStride_a[])

{

    uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;

    // yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,

    //            srcStride[0], srcStride[1], dstStride[0]);

    const uint8_t *ysrc              = src[0];

    const uint8_t *usrc              = src[1];

    const uint8_t *vsrc              = src[2];

    const int width                  = c->srcW;

    const int height                 = srcSliceH;

    const int lumStride              = srcStride[0];

    const int chromStride            = srcStride[1];

    const int dstStride              = dstStride_a[0];

    const int vertLumPerChroma       = 2;

    const vector unsigned char yperm = vec_lvsl(0, ysrc);

    register unsigned int y;

    /* This code assumes:

     *

     * 1) dst is 16 bytes-aligned

     * 2) dstStride is a multiple of 16

     * 3) width is a multiple of 16

     * 4) lum & chrom stride are multiples of 8

     */

    for (y = 0; y < height; y++) {

        int i;

        for (i = 0; i < width - 31; i += 32) {

            const unsigned int j          = i >> 1;

            vector unsigned char v_yA     = vec_ld(i, ysrc);

            vector unsigned char v_yB     = vec_ld(i + 16, ysrc);

            vector unsigned char v_yC     = vec_ld(i + 32, ysrc);

            vector unsigned char v_y1     = vec_perm(v_yA, v_yB, yperm);

            vector unsigned char v_y2     = vec_perm(v_yB, v_yC, yperm);

            vector unsigned char v_uA     = vec_ld(j, usrc);

            vector unsigned char v_uB     = vec_ld(j + 16, usrc);

            vector unsigned char v_u      = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));

            vector unsigned char v_vA     = vec_ld(j, vsrc);

            vector unsigned char v_vB     = vec_ld(j + 16, vsrc);

            vector unsigned char v_v      = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));

            vector unsigned char v_uv_a   = vec_mergeh(v_u, v_v);

            vector unsigned char v_uv_b   = vec_mergel(v_u, v_v);

            vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);

            vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);

            vector unsigned char v_uyvy_2 = vec_mergeh(v_uv_b, v_y2);

            vector unsigned char v_uyvy_3 = vec_mergel(v_uv_b, v_y2);

            vec_st(v_uyvy_0, (i << 1), dst);

            vec_st(v_uyvy_1, (i << 1) + 16, dst);

            vec_st(v_uyvy_2, (i << 1) + 32, dst);

            vec_st(v_uyvy_3, (i << 1) + 48, dst);

        }

        if (i < width) {

            const unsigned int j          = i >> 1;

            vector unsigned char v_y1     = vec_ld(i, ysrc);

            vector unsigned char v_u      = vec_ld(j, usrc);

            vector unsigned char v_v      = vec_ld(j, vsrc);

            vector unsigned char v_uv_a   = vec_mergeh(v_u, v_v);

            vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);

            vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);

            vec_st(v_uyvy_0, (i << 1), dst);

            vec_st(v_uyvy_1, (i << 1) + 16, dst);

        }

        if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {

            usrc += chromStride;

            vsrc += chromStride;

        }

        ysrc += lumStride;

        dst  += dstStride;

    }

    return srcSliceH;

}

#endif /* HAVE_ALTIVEC */

av_cold void ff_get_unscaled_swscale_ppc(SwsContext *c)

{

#if HAVE_ALTIVEC

    if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))

        return;

    if (!(c->srcW & 15) && !(c->flags & SWS_BITEXACT) &&

        c->srcFormat == AV_PIX_FMT_YUV420P) {

        enum AVPixelFormat dstFormat = c->dstFormat;

        // unscaled YV12 -> packed YUV, we want speed

        if (dstFormat == AV_PIX_FMT_YUYV422)

            c->swscale = yv12toyuy2_unscaled_altivec;

        else if (dstFormat == AV_PIX_FMT_UYVY422)

            c->swscale = yv12touyvy_unscaled_altivec;

    }

#endif /* HAVE_ALTIVEC */

}