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/libavcodec/ppc/fmtconvert_altivec.c

http://github.com/FFmpeg/FFmpeg
C | 66 lines | 39 code | 8 blank | 19 comment | 2 complexity | 9e26ee15a543852cf6ef80ea6709f4de MD5 | raw file
 1/*
 2 * Copyright (c) 2006 Luca Barbato <lu_zero@gentoo.org>
 3 *
 4 * This file is part of FFmpeg.
 5 *
 6 * FFmpeg is free software; you can redistribute it and/or
 7 * modify it under the terms of the GNU Lesser General Public
 8 * License as published by the Free Software Foundation; either
 9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "config.h"
22#include "libavutil/attributes.h"
23#include "libavutil/cpu.h"
24#include "libavutil/mem.h"
25#include "libavutil/ppc/cpu.h"
26#include "libavutil/ppc/util_altivec.h"
27#include "libavcodec/fmtconvert.h"
28
29#if HAVE_ALTIVEC
30
31static void int32_to_float_fmul_scalar_altivec(float *dst, const int32_t *src,
32                                               float mul, int len)
33{
34    union {
35        vector float v;
36        float s[4];
37    } mul_u;
38    int i;
39    vector float src1, src2, dst1, dst2, mul_v, zero;
40
41    zero = (vector float)vec_splat_u32(0);
42    mul_u.s[0] = mul;
43    mul_v = vec_splat(mul_u.v, 0);
44
45    for (i = 0; i < len; i += 8) {
46        src1 = vec_ctf(vec_ld(0,  src+i), 0);
47        src2 = vec_ctf(vec_ld(16, src+i), 0);
48        dst1 = vec_madd(src1, mul_v, zero);
49        dst2 = vec_madd(src2, mul_v, zero);
50        vec_st(dst1,  0, dst+i);
51        vec_st(dst2, 16, dst+i);
52    }
53}
54
55#endif /* HAVE_ALTIVEC */
56
57av_cold void ff_fmt_convert_init_ppc(FmtConvertContext *c,
58                                     AVCodecContext *avctx)
59{
60#if HAVE_ALTIVEC
61    if (!PPC_ALTIVEC(av_get_cpu_flags()))
62        return;
63
64    c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_altivec;
65#endif /* HAVE_ALTIVEC */
66}