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fmtconvert_altivec.c
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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"
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 
165  AVCodecContext *avctx)
166 {
167 #if HAVE_ALTIVEC
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 }