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ffmpeg / libavcodec / ppc / fmtconvert_altivec.c @ fe2ff6d2

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/*
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 * Copyright (c) 2006 Luca Barbato <lu_zero@gentoo.org>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavcodec/fmtconvert.h"
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#include "dsputil_altivec.h"
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#include "util_altivec.h"
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static void int32_to_float_fmul_scalar_altivec(float *dst, const int *src, float mul, int len)
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{
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    union {
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        vector float v;
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        float s[4];
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    } mul_u;
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    int i;
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    vector float src1, src2, dst1, dst2, mul_v, zero;
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    zero = (vector float)vec_splat_u32(0);
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    mul_u.s[0] = mul;
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    mul_v = vec_splat(mul_u.v, 0);
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    for(i=0; i<len; i+=8) {
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        src1 = vec_ctf(vec_ld(0,  src+i), 0);
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        src2 = vec_ctf(vec_ld(16, src+i), 0);
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        dst1 = vec_madd(src1, mul_v, zero);
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        dst2 = vec_madd(src2, mul_v, zero);
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        vec_st(dst1,  0, dst+i);
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        vec_st(dst2, 16, dst+i);
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    }
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}
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static vector signed short
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float_to_int16_one_altivec(const float *src)
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{
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    vector float s0 = vec_ld(0, src);
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    vector float s1 = vec_ld(16, src);
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    vector signed int t0 = vec_cts(s0, 0);
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    vector signed int t1 = vec_cts(s1, 0);
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    return vec_packs(t0,t1);
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}
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static void float_to_int16_altivec(int16_t *dst, const float *src, long len)
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{
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    int i;
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    vector signed short d0, d1, d;
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    vector unsigned char align;
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    if(((long)dst)&15) //FIXME
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    for(i=0; i<len-7; i+=8) {
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        d0 = vec_ld(0, dst+i);
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        d = float_to_int16_one_altivec(src+i);
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        d1 = vec_ld(15, dst+i);
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        d1 = vec_perm(d1, d0, vec_lvsl(0,dst+i));
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        align = vec_lvsr(0, dst+i);
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        d0 = vec_perm(d1, d, align);
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        d1 = vec_perm(d, d1, align);
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        vec_st(d0, 0, dst+i);
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        vec_st(d1,15, dst+i);
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    }
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    else
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    for(i=0; i<len-7; i+=8) {
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        d = float_to_int16_one_altivec(src+i);
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        vec_st(d, 0, dst+i);
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    }
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}
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static void
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float_to_int16_interleave_altivec(int16_t *dst, const float **src,
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                                  long len, int channels)
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{
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    int i;
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    vector signed short d0, d1, d2, c0, c1, t0, t1;
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    vector unsigned char align;
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    if(channels == 1)
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        float_to_int16_altivec(dst, src[0], len);
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    else
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        if (channels == 2) {
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        if(((long)dst)&15)
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        for(i=0; i<len-7; i+=8) {
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            d0 = vec_ld(0, dst + i);
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            t0 = float_to_int16_one_altivec(src[0] + i);
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            d1 = vec_ld(31, dst + i);
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            t1 = float_to_int16_one_altivec(src[1] + i);
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            c0 = vec_mergeh(t0, t1);
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            c1 = vec_mergel(t0, t1);
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            d2 = vec_perm(d1, d0, vec_lvsl(0, dst + i));
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            align = vec_lvsr(0, dst + i);
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            d0 = vec_perm(d2, c0, align);
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            d1 = vec_perm(c0, c1, align);
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            vec_st(d0,  0, dst + i);
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            d0 = vec_perm(c1, d2, align);
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            vec_st(d1, 15, dst + i);
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            vec_st(d0, 31, dst + i);
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            dst+=8;
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        }
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        else
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        for(i=0; i<len-7; i+=8) {
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            t0 = float_to_int16_one_altivec(src[0] + i);
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            t1 = float_to_int16_one_altivec(src[1] + i);
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            d0 = vec_mergeh(t0, t1);
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            d1 = vec_mergel(t0, t1);
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            vec_st(d0,  0, dst + i);
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            vec_st(d1, 16, dst + i);
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            dst+=8;
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        }
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    } else {
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        DECLARE_ALIGNED(16, int16_t, tmp)[len];
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        int c, j;
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        for (c = 0; c < channels; c++) {
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            float_to_int16_altivec(tmp, src[c], len);
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            for (i = 0, j = c; i < len; i++, j+=channels) {
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                dst[j] = tmp[i];
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            }
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        }
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   }
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}
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void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx)
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{
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    c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_altivec;
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    if(!(avctx->flags & CODEC_FLAG_BITEXACT)) {
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        c->float_to_int16 = float_to_int16_altivec;
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        c->float_to_int16_interleave = float_to_int16_interleave_altivec;
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    }
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}