PeerStreamer

/*

 * Copyright (c) 2006 Luca Barbato <lu_zero@gentoo.org>

 *

 * 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 "libavcodec/dsputil.h"

#include "dsputil_altivec.h"

#include "util_altivec.h"

static void vector_fmul_altivec(float *dst, const float *src0, const float *src1, int len)

{

    int i;

    vector float d0, d1, s, zero = (vector float)vec_splat_u32(0);

    for(i=0; i<len-7; i+=8) {

        d0 = vec_ld(0, src0+i);

        s = vec_ld(0, src1+i);

        d1 = vec_ld(16, src0+i);

        d0 = vec_madd(d0, s, zero);

        d1 = vec_madd(d1, vec_ld(16,src1+i), zero);

        vec_st(d0, 0, dst+i);

        vec_st(d1, 16, dst+i);

    }

}

static void vector_fmul_reverse_altivec(float *dst, const float *src0,

                                        const float *src1, int len)

{

    int i;

    vector float d, s0, s1, h0, l0,

                 s2, s3, zero = (vector float)vec_splat_u32(0);

    src1 += len-4;

    for(i=0; i<len-7; i+=8) {

        s1 = vec_ld(0, src1-i);              // [a,b,c,d]

        s0 = vec_ld(0, src0+i);

        l0 = vec_mergel(s1, s1);             // [c,c,d,d]

        s3 = vec_ld(-16, src1-i);

        h0 = vec_mergeh(s1, s1);             // [a,a,b,b]

        s2 = vec_ld(16, src0+i);

        s1 = vec_mergeh(vec_mergel(l0,h0),   // [d,b,d,b]

                        vec_mergeh(l0,h0));  // [c,a,c,a]

                                             // [d,c,b,a]

        l0 = vec_mergel(s3, s3);

        d = vec_madd(s0, s1, zero);

        h0 = vec_mergeh(s3, s3);

        vec_st(d, 0, dst+i);

        s3 = vec_mergeh(vec_mergel(l0,h0),

                        vec_mergeh(l0,h0));

        d = vec_madd(s2, s3, zero);

        vec_st(d, 16, dst+i);

    }

}

static void vector_fmul_add_altivec(float *dst, const float *src0,

                                    const float *src1, const float *src2,

                                    int len)

{

    int i;

    vector float d, s0, s1, s2, t0, t1, edges;

    vector unsigned char align = vec_lvsr(0,dst),

                         mask = vec_lvsl(0, dst);

    for (i=0; i<len-3; i+=4) {

        t0 = vec_ld(0, dst+i);

        t1 = vec_ld(15, dst+i);

        s0 = vec_ld(0, src0+i);

        s1 = vec_ld(0, src1+i);

        s2 = vec_ld(0, src2+i);

        edges = vec_perm(t1 ,t0, mask);

        d = vec_madd(s0,s1,s2);

        t1 = vec_perm(d, edges, align);

        t0 = vec_perm(edges, d, align);

        vec_st(t1, 15, dst+i);

        vec_st(t0, 0, dst+i);

    }

}

static void vector_fmul_window_altivec(float *dst, const float *src0, const float *src1, const float *win, float add_bias, int len)

{

    union {

        vector float v;

        float s[4];

    } vadd;

    vector float vadd_bias, zero, t0, t1, s0, s1, wi, wj;

    const vector unsigned char reverse = vcprm(3,2,1,0);

    int i,j;

    dst += len;

    win += len;

    src0+= len;

    vadd.s[0] = add_bias;

    vadd_bias = vec_splat(vadd.v, 0);

    zero = (vector float)vec_splat_u32(0);

    for(i=-len*4, j=len*4-16; i<0; i+=16, j-=16) {

        s0 = vec_ld(i, src0);

        s1 = vec_ld(j, src1);

        wi = vec_ld(i, win);

        wj = vec_ld(j, win);

        s1 = vec_perm(s1, s1, reverse);

        wj = vec_perm(wj, wj, reverse);

        t0 = vec_madd(s0, wj, vadd_bias);

        t0 = vec_nmsub(s1, wi, t0);

        t1 = vec_madd(s0, wi, vadd_bias);

        t1 = vec_madd(s1, wj, t1);

        t1 = vec_perm(t1, t1, reverse);

        vec_st(t0, i, dst);

        vec_st(t1, j, dst);

    }

}

static void int32_to_float_fmul_scalar_altivec(float *dst, const int *src, float mul, int len)

{

    union {

        vector float v;

        float s[4];

    } mul_u;

    int i;

    vector float src1, src2, dst1, dst2, mul_v, zero;

    zero = (vector float)vec_splat_u32(0);

    mul_u.s[0] = mul;

    mul_v = vec_splat(mul_u.v, 0);

    for(i=0; i<len; i+=8) {

        src1 = vec_ctf(vec_ld(0,  src+i), 0);

        src2 = vec_ctf(vec_ld(16, src+i), 0);

        dst1 = vec_madd(src1, mul_v, zero);

        dst2 = vec_madd(src2, mul_v, zero);

        vec_st(dst1,  0, dst+i);

        vec_st(dst2, 16, dst+i);

    }

}

static vector signed short

float_to_int16_one_altivec(const float *src)

{

    vector float s0 = vec_ld(0, src);

    vector float s1 = vec_ld(16, src);

    vector signed int t0 = vec_cts(s0, 0);

    vector signed int t1 = vec_cts(s1, 0);

    return vec_packs(t0,t1);

}

static void float_to_int16_altivec(int16_t *dst, const float *src, long len)

{

    int i;

    vector signed short d0, d1, d;

    vector unsigned char align;

    if(((long)dst)&15) //FIXME

    for(i=0; i<len-7; i+=8) {

        d0 = vec_ld(0, dst+i);

        d = float_to_int16_one_altivec(src+i);

        d1 = vec_ld(15, dst+i);

        d1 = vec_perm(d1, d0, vec_lvsl(0,dst+i));

        align = vec_lvsr(0, dst+i);

        d0 = vec_perm(d1, d, align);

        d1 = vec_perm(d, d1, align);

        vec_st(d0, 0, dst+i);

        vec_st(d1,15, dst+i);

    }

    else

    for(i=0; i<len-7; i+=8) {

        d = float_to_int16_one_altivec(src+i);

        vec_st(d, 0, dst+i);

    }

}

static void

float_to_int16_interleave_altivec(int16_t *dst, const float **src,

                                  long len, int channels)

{

    int i;

    vector signed short d0, d1, d2, c0, c1, t0, t1;

    vector unsigned char align;

    if(channels == 1)

        float_to_int16_altivec(dst, src[0], len);

    else

        if (channels == 2) {

        if(((long)dst)&15)

        for(i=0; i<len-7; i+=8) {

            d0 = vec_ld(0, dst + i);

            t0 = float_to_int16_one_altivec(src[0] + i);

            d1 = vec_ld(31, dst + i);

            t1 = float_to_int16_one_altivec(src[1] + i);

            c0 = vec_mergeh(t0, t1);

            c1 = vec_mergel(t0, t1);

            d2 = vec_perm(d1, d0, vec_lvsl(0, dst + i));

            align = vec_lvsr(0, dst + i);

            d0 = vec_perm(d2, c0, align);

            d1 = vec_perm(c0, c1, align);

            vec_st(d0,  0, dst + i);

            d0 = vec_perm(c1, d2, align);

            vec_st(d1, 15, dst + i);

            vec_st(d0, 31, dst + i);

            dst+=8;

        }

        else

        for(i=0; i<len-7; i+=8) {

            t0 = float_to_int16_one_altivec(src[0] + i);

            t1 = float_to_int16_one_altivec(src[1] + i);

            d0 = vec_mergeh(t0, t1);

            d1 = vec_mergel(t0, t1);

            vec_st(d0,  0, dst + i);

            vec_st(d1, 16, dst + i);

            dst+=8;

        }

    } else {

        DECLARE_ALIGNED(16, int16_t, tmp)[len];

        int c, j;

        for (c = 0; c < channels; c++) {

            float_to_int16_altivec(tmp, src[c], len);

            for (i = 0, j = c; i < len; i++, j+=channels) {

                dst[j] = tmp[i];

            }

        }

   }

}

void float_init_altivec(DSPContext* c, AVCodecContext *avctx)

{

    c->vector_fmul = vector_fmul_altivec;

    c->vector_fmul_reverse = vector_fmul_reverse_altivec;

    c->vector_fmul_add = vector_fmul_add_altivec;

    c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_altivec;

    if(!(avctx->flags & CODEC_FLAG_BITEXACT)) {

        c->vector_fmul_window = vector_fmul_window_altivec;

        c->float_to_int16 = float_to_int16_altivec;

        c->float_to_int16_interleave = float_to_int16_interleave_altivec;

    }

}