67 lines
2 KiB
C
67 lines
2 KiB
C
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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 "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/cpu.h"
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#include "libavutil/mem.h"
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#include "libavutil/ppc/cpu.h"
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#include "libavutil/ppc/util_altivec.h"
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#include "libavcodec/fmtconvert.h"
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#if HAVE_ALTIVEC
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static void int32_to_float_fmul_scalar_altivec(float *dst, const int32_t *src,
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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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#endif /* HAVE_ALTIVEC */
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av_cold void ff_fmt_convert_init_ppc(FmtConvertContext *c,
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AVCodecContext *avctx)
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{
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#if HAVE_ALTIVEC
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if (!PPC_ALTIVEC(av_get_cpu_flags()))
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return;
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c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_altivec;
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#endif /* HAVE_ALTIVEC */
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}
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