ffmpeg / libavcodec / ppc / idct_altivec.c @ 1ee076b1
History  View  Annotate  Download (10.6 KB)
1 
/*


2 
* Copyright (c) 2001 Michel Lespinasse

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 021101301 USA

19 
*/

20  
21 
/*

22 
* NOTE: This code is based on GPL code from the libmpeg2 project. The

23 
* author, Michel Lespinasses, has given explicit permission to release

24 
* under LGPL as part of FFmpeg.

25 
*/

26  
27 
/*

28 
* FFmpeg integration by Dieter Shirley

29 
*

30 
* This file is a direct copy of the AltiVec IDCT module from the libmpeg2

31 
* project. I've deleted all of the libmpeg2specific code, renamed the

32 
* functions and reordered the function parameters. The only change to the

33 
* IDCT function itself was to factor out the partial transposition, and to

34 
* perform a full transpose at the end of the function.

35 
*/

36  
37  
38 
#include <stdlib.h> /* malloc(), free() */ 
39 
#include <string.h> 
40 
#include "config.h" 
41 
#if HAVE_ALTIVEC_H

42 
#include <altivec.h> 
43 
#endif

44 
#include "libavcodec/dsputil.h" 
45 
#include "types_altivec.h" 
46 
#include "dsputil_altivec.h" 
47  
48 
#define IDCT_HALF \

49 
/* 1st stage */ \

50 
t1 = vec_mradds (a1, vx7, vx1 ); \ 
51 
t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7)); \ 
52 
t7 = vec_mradds (a2, vx5, vx3); \ 
53 
t3 = vec_mradds (ma2, vx3, vx5); \ 
54 
\ 
55 
/* 2nd stage */ \

56 
t5 = vec_adds (vx0, vx4); \ 
57 
t0 = vec_subs (vx0, vx4); \ 
58 
t2 = vec_mradds (a0, vx6, vx2); \ 
59 
t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6)); \ 
60 
t6 = vec_adds (t8, t3); \ 
61 
t3 = vec_subs (t8, t3); \ 
62 
t8 = vec_subs (t1, t7); \ 
63 
t1 = vec_adds (t1, t7); \ 
64 
\ 
65 
/* 3rd stage */ \

66 
t7 = vec_adds (t5, t2); \ 
67 
t2 = vec_subs (t5, t2); \ 
68 
t5 = vec_adds (t0, t4); \ 
69 
t0 = vec_subs (t0, t4); \ 
70 
t4 = vec_subs (t8, t3); \ 
71 
t3 = vec_adds (t8, t3); \ 
72 
\ 
73 
/* 4th stage */ \

74 
vy0 = vec_adds (t7, t1); \ 
75 
vy7 = vec_subs (t7, t1); \ 
76 
vy1 = vec_mradds (c4, t3, t5); \ 
77 
vy6 = vec_mradds (mc4, t3, t5); \ 
78 
vy2 = vec_mradds (c4, t4, t0); \ 
79 
vy5 = vec_mradds (mc4, t4, t0); \ 
80 
vy3 = vec_adds (t2, t6); \ 
81 
vy4 = vec_subs (t2, t6); 
82  
83  
84 
#define IDCT \

85 
vec_s16 vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7; \ 
86 
vec_s16 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \ 
87 
vec_s16 a0, a1, a2, ma2, c4, mc4, zero, bias; \ 
88 
vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8; \ 
89 
vec_u16 shift; \ 
90 
\ 
91 
c4 = vec_splat (constants[0], 0); \ 
92 
a0 = vec_splat (constants[0], 1); \ 
93 
a1 = vec_splat (constants[0], 2); \ 
94 
a2 = vec_splat (constants[0], 3); \ 
95 
mc4 = vec_splat (constants[0], 4); \ 
96 
ma2 = vec_splat (constants[0], 5); \ 
97 
bias = (vec_s16)vec_splat ((vec_s32)constants[0], 3); \ 
98 
\ 
99 
zero = vec_splat_s16 (0); \

100 
shift = vec_splat_u16 (4); \

101 
\ 
102 
vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero); \ 
103 
vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero); \ 
104 
vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero); \ 
105 
vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero); \ 
106 
vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero); \ 
107 
vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero); \ 
108 
vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero); \ 
109 
vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero); \ 
110 
\ 
111 
IDCT_HALF \ 
112 
\ 
113 
vx0 = vec_mergeh (vy0, vy4); \ 
114 
vx1 = vec_mergel (vy0, vy4); \ 
115 
vx2 = vec_mergeh (vy1, vy5); \ 
116 
vx3 = vec_mergel (vy1, vy5); \ 
117 
vx4 = vec_mergeh (vy2, vy6); \ 
118 
vx5 = vec_mergel (vy2, vy6); \ 
119 
vx6 = vec_mergeh (vy3, vy7); \ 
120 
vx7 = vec_mergel (vy3, vy7); \ 
121 
\ 
122 
vy0 = vec_mergeh (vx0, vx4); \ 
123 
vy1 = vec_mergel (vx0, vx4); \ 
124 
vy2 = vec_mergeh (vx1, vx5); \ 
125 
vy3 = vec_mergel (vx1, vx5); \ 
126 
vy4 = vec_mergeh (vx2, vx6); \ 
127 
vy5 = vec_mergel (vx2, vx6); \ 
128 
vy6 = vec_mergeh (vx3, vx7); \ 
129 
vy7 = vec_mergel (vx3, vx7); \ 
130 
\ 
131 
vx0 = vec_adds (vec_mergeh (vy0, vy4), bias); \ 
132 
vx1 = vec_mergel (vy0, vy4); \ 
133 
vx2 = vec_mergeh (vy1, vy5); \ 
134 
vx3 = vec_mergel (vy1, vy5); \ 
135 
vx4 = vec_mergeh (vy2, vy6); \ 
136 
vx5 = vec_mergel (vy2, vy6); \ 
137 
vx6 = vec_mergeh (vy3, vy7); \ 
138 
vx7 = vec_mergel (vy3, vy7); \ 
139 
\ 
140 
IDCT_HALF \ 
141 
\ 
142 
shift = vec_splat_u16 (6); \

143 
vx0 = vec_sra (vy0, shift); \ 
144 
vx1 = vec_sra (vy1, shift); \ 
145 
vx2 = vec_sra (vy2, shift); \ 
146 
vx3 = vec_sra (vy3, shift); \ 
147 
vx4 = vec_sra (vy4, shift); \ 
148 
vx5 = vec_sra (vy5, shift); \ 
149 
vx6 = vec_sra (vy6, shift); \ 
150 
vx7 = vec_sra (vy7, shift); 
151  
152  
153 
static const vec_s16 constants[5] = { 
154 
{23170, 13573, 6518, 21895, 23170, 21895, 32, 31}, 
155 
{16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725}, 
156 
{22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521}, 
157 
{21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692}, 
158 
{19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722} 
159 
}; 
160  
161 
void idct_put_altivec(uint8_t* dest, int stride, int16_t *blk) 
162 
{ 
163 
vec_s16 *block = (vec_s16*)blk; 
164 
vec_u8 tmp; 
165  
166 
IDCT 
167  
168 
#define COPY(dest,src) \

169 
tmp = vec_packsu (src, src); \ 
170 
vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ 
171 
vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); 
172  
173 
COPY (dest, vx0) dest += stride; 
174 
COPY (dest, vx1) dest += stride; 
175 
COPY (dest, vx2) dest += stride; 
176 
COPY (dest, vx3) dest += stride; 
177 
COPY (dest, vx4) dest += stride; 
178 
COPY (dest, vx5) dest += stride; 
179 
COPY (dest, vx6) dest += stride; 
180 
COPY (dest, vx7) 
181 
} 
182  
183 
void idct_add_altivec(uint8_t* dest, int stride, int16_t *blk) 
184 
{ 
185 
vec_s16 *block = (vec_s16*)blk; 
186 
vec_u8 tmp; 
187 
vec_s16 tmp2, tmp3; 
188 
vec_u8 perm0; 
189 
vec_u8 perm1; 
190 
vec_u8 p0, p1, p; 
191  
192 
IDCT 
193  
194 
p0 = vec_lvsl (0, dest);

195 
p1 = vec_lvsl (stride, dest); 
196 
p = vec_splat_u8 (1);

197 
perm0 = vec_mergeh (p, p0); 
198 
perm1 = vec_mergeh (p, p1); 
199  
200 
#define ADD(dest,src,perm) \

201 
/* *(uint64_t *)&tmp = *(uint64_t *)dest; */ \

202 
tmp = vec_ld (0, dest); \

203 
tmp2 = (vec_s16)vec_perm (tmp, (vec_u8)zero, perm); \ 
204 
tmp3 = vec_adds (tmp2, src); \ 
205 
tmp = vec_packsu (tmp3, tmp3); \ 
206 
vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ 
207 
vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); 
208  
209 
ADD (dest, vx0, perm0) dest += stride; 
210 
ADD (dest, vx1, perm1) dest += stride; 
211 
ADD (dest, vx2, perm0) dest += stride; 
212 
ADD (dest, vx3, perm1) dest += stride; 
213 
ADD (dest, vx4, perm0) dest += stride; 
214 
ADD (dest, vx5, perm1) dest += stride; 
215 
ADD (dest, vx6, perm0) dest += stride; 
216 
ADD (dest, vx7, perm1) 
217 
} 
218 