fmtconvert_altivec.c

   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
  31 static 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
  56 static vector signed short float_to_int16_one_altivec(const float *src)
  57 {
  58     vector float s0 = vec_ld(0, src);
  59     vector float s1 = vec_ld(16, src);
  60     vector signed int t0 = vec_cts(s0, 0);
  61     vector signed int t1 = vec_cts(s1, 0);
  62     return vec_packs(t0,t1);
  63 }
  64
  65 static void float_to_int16_altivec(int16_t *dst, const float *src, long len)
  66 {
  67     int i;
  68     vector signed short d0, d1, d;
  69     vector unsigned char align;
  70     if (((long)dst) & 15) { //FIXME
  71         for (i = 0; i < len - 7; i += 8) {
  72             d0 = vec_ld(0, dst+i);
  73             d  = float_to_int16_one_altivec(src + i);
  74             d1 = vec_ld(15, dst+i);
  75             d1 = vec_perm(d1, d0, vec_lvsl(0, dst + i));
  76             align = vec_lvsr(0, dst + i);
  77             d0 = vec_perm(d1, d, align);
  78             d1 = vec_perm(d, d1, align);
  79             vec_st(d0,  0, dst + i);
  80             vec_st(d1, 15, dst + i);
  81         }
  82     } else {
  83         for (i = 0; i < len - 7; i += 8) {
  84             d = float_to_int16_one_altivec(src + i);
  85             vec_st(d, 0, dst + i);
  86         }
  87     }
  88 }
  89
  90 #define VSTE_INC(dst, v, elem, inc) do {                \
  91         vector signed short s = vec_splat(v, elem);     \
  92         vec_ste(s, 0, dst);                             \
  93         dst += inc;                                     \
  94     } while (0)
  95
  96 static void float_to_int16_stride_altivec(int16_t *dst, const float *src,
  97                                           long len, int stride)
  98 {
  99     int i;
 100     vector signed short d;
 101
 102     for (i = 0; i < len - 7; i += 8) {
 103         d = float_to_int16_one_altivec(src + i);
 104         VSTE_INC(dst, d, 0, stride);
 105         VSTE_INC(dst, d, 1, stride);
 106         VSTE_INC(dst, d, 2, stride);
 107         VSTE_INC(dst, d, 3, stride);
 108         VSTE_INC(dst, d, 4, stride);
 109         VSTE_INC(dst, d, 5, stride);
 110         VSTE_INC(dst, d, 6, stride);
 111         VSTE_INC(dst, d, 7, stride);
 112     }
 113 }
 114
 115 static void float_to_int16_interleave_altivec(int16_t *dst, const float **src,
 116                                               long len, int channels)
 117 {
 118     int i;
 119     vector signed short d0, d1, d2, c0, c1, t0, t1;
 120     vector unsigned char align;
 121
 122     if (channels == 1)
 123         float_to_int16_altivec(dst, src[0], len);
 124     else {
 125         if (channels == 2) {
 126             if (((long)dst) & 15) {
 127                 for (i = 0; i < len - 7; i += 8) {
 128                     d0 = vec_ld(0,  dst + i);
 129                     t0 = float_to_int16_one_altivec(src[0] + i);
 130                     d1 = vec_ld(31, dst + i);
 131                     t1 = float_to_int16_one_altivec(src[1] + i);
 132                     c0 = vec_mergeh(t0, t1);
 133                     c1 = vec_mergel(t0, t1);
 134                     d2 = vec_perm(d1, d0, vec_lvsl(0, dst + i));
 135                     align = vec_lvsr(0, dst + i);
 136                     d0 = vec_perm(d2, c0, align);
 137                     d1 = vec_perm(c0, c1, align);
 138                     vec_st(d0,  0, dst + i);
 139                     d0 = vec_perm(c1, d2, align);
 140                     vec_st(d1, 15, dst + i);
 141                     vec_st(d0, 31, dst + i);
 142                     dst += 8;
 143                 }
 144             } else {
 145                 for (i = 0; i < len - 7; i += 8) {
 146                     t0 = float_to_int16_one_altivec(src[0] + i);
 147                     t1 = float_to_int16_one_altivec(src[1] + i);
 148                     d0 = vec_mergeh(t0, t1);
 149                     d1 = vec_mergel(t0, t1);
 150                     vec_st(d0,  0, dst + i);
 151                     vec_st(d1, 16, dst + i);
 152                     dst += 8;
 153                 }
 154             }
 155         } else {
 156             for (i = 0; i < channels; i++)
 157                 float_to_int16_stride_altivec(dst + i, src[i], len, channels);
 158         }
 159     }
 160 }
 161
 162 #endif /* HAVE_ALTIVEC */
 163
 164 av_cold void ff_fmt_convert_init_ppc(FmtConvertContext *c,
 165                                      AVCodecContext *avctx)
 166 {
 167 #if HAVE_ALTIVEC
 168     if (!PPC_ALTIVEC(av_get_cpu_flags()))
 169         return;
 170
 171     c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_altivec;
 172     if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
 173         c->float_to_int16 = float_to_int16_altivec;
 174         c->float_to_int16_interleave = float_to_int16_interleave_altivec;
 175     }
 176 #endif /* HAVE_ALTIVEC */
 177 }