2
* Copyright (c) 2001 Michel Lespinasse
4
* This file is part of Libav.
6
* Libav 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.
11
* Libav 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.
16
* You should have received a copy of the GNU Lesser General Public
17
* License along with Libav; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
/* NOTE: This code is based on GPL code from the libmpeg2 project. The
22
* author, Michel Lespinasses, has given explicit permission to release
23
* under LGPL as part of Libav.
25
* Libav integration by Dieter Shirley
27
* This file is a direct copy of the AltiVec IDCT module from the libmpeg2
28
* project. I've deleted all of the libmpeg2-specific code, renamed the
29
* functions and reordered the function parameters. The only change to the
30
* IDCT function itself was to factor out the partial transposition, and to
31
* perform a full transpose at the end of the function. */
40
#include "libavutil/attributes.h"
41
#include "libavutil/cpu.h"
42
#include "libavutil/ppc/cpu.h"
43
#include "libavutil/ppc/types_altivec.h"
44
#include "libavcodec/idctdsp.h"
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); \
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); \
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); \
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)
84
vec_s16 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \
85
vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8; \
87
vec_s16 c4 = vec_splat(constants[0], 0); \
88
vec_s16 a0 = vec_splat(constants[0], 1); \
89
vec_s16 a1 = vec_splat(constants[0], 2); \
90
vec_s16 a2 = vec_splat(constants[0], 3); \
91
vec_s16 mc4 = vec_splat(constants[0], 4); \
92
vec_s16 ma2 = vec_splat(constants[0], 5); \
93
vec_s16 bias = (vec_s16) vec_splat((vec_s32) constants[0], 3); \
95
vec_s16 zero = vec_splat_s16(0); \
96
vec_u16 shift = vec_splat_u16(4); \
98
vec_s16 vx0 = vec_mradds(vec_sl(block[0], shift), constants[1], zero); \
99
vec_s16 vx1 = vec_mradds(vec_sl(block[1], shift), constants[2], zero); \
100
vec_s16 vx2 = vec_mradds(vec_sl(block[2], shift), constants[3], zero); \
101
vec_s16 vx3 = vec_mradds(vec_sl(block[3], shift), constants[4], zero); \
102
vec_s16 vx4 = vec_mradds(vec_sl(block[4], shift), constants[1], zero); \
103
vec_s16 vx5 = vec_mradds(vec_sl(block[5], shift), constants[4], zero); \
104
vec_s16 vx6 = vec_mradds(vec_sl(block[6], shift), constants[3], zero); \
105
vec_s16 vx7 = vec_mradds(vec_sl(block[7], shift), constants[2], zero); \
109
vx0 = vec_mergeh(vy0, vy4); \
110
vx1 = vec_mergel(vy0, vy4); \
111
vx2 = vec_mergeh(vy1, vy5); \
112
vx3 = vec_mergel(vy1, vy5); \
113
vx4 = vec_mergeh(vy2, vy6); \
114
vx5 = vec_mergel(vy2, vy6); \
115
vx6 = vec_mergeh(vy3, vy7); \
116
vx7 = vec_mergel(vy3, vy7); \
118
vy0 = vec_mergeh(vx0, vx4); \
119
vy1 = vec_mergel(vx0, vx4); \
120
vy2 = vec_mergeh(vx1, vx5); \
121
vy3 = vec_mergel(vx1, vx5); \
122
vy4 = vec_mergeh(vx2, vx6); \
123
vy5 = vec_mergel(vx2, vx6); \
124
vy6 = vec_mergeh(vx3, vx7); \
125
vy7 = vec_mergel(vx3, vx7); \
127
vx0 = vec_adds(vec_mergeh(vy0, vy4), bias); \
128
vx1 = vec_mergel(vy0, vy4); \
129
vx2 = vec_mergeh(vy1, vy5); \
130
vx3 = vec_mergel(vy1, vy5); \
131
vx4 = vec_mergeh(vy2, vy6); \
132
vx5 = vec_mergel(vy2, vy6); \
133
vx6 = vec_mergeh(vy3, vy7); \
134
vx7 = vec_mergel(vy3, vy7); \
138
shift = vec_splat_u16(6); \
139
vx0 = vec_sra(vy0, shift); \
140
vx1 = vec_sra(vy1, shift); \
141
vx2 = vec_sra(vy2, shift); \
142
vx3 = vec_sra(vy3, shift); \
143
vx4 = vec_sra(vy4, shift); \
144
vx5 = vec_sra(vy5, shift); \
145
vx6 = vec_sra(vy6, shift); \
146
vx7 = vec_sra(vy7, shift)
148
static const vec_s16 constants[5] = {
149
{ 23170, 13573, 6518, 21895, -23170, -21895, 32, 31 },
150
{ 16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725 },
151
{ 22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521 },
152
{ 21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692 },
153
{ 19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722 }
156
static void idct_put_altivec(uint8_t *dest, int stride, int16_t *blk)
158
vec_s16 *block = (vec_s16 *) blk;
163
#define COPY(dest, src) \
164
tmp = vec_packsu(src, src); \
165
vec_ste((vec_u32) tmp, 0, (unsigned int *) dest); \
166
vec_ste((vec_u32) tmp, 4, (unsigned int *) dest)
185
static void idct_add_altivec(uint8_t *dest, int stride, int16_t *blk)
187
vec_s16 *block = (vec_s16 *) blk;
196
p0 = vec_lvsl(0, dest);
197
p1 = vec_lvsl(stride, dest);
198
p = vec_splat_u8(-1);
199
perm0 = vec_mergeh(p, p0);
200
perm1 = vec_mergeh(p, p1);
202
#define ADD(dest, src, perm) \
203
/* *(uint64_t *) &tmp = *(uint64_t *) dest; */ \
204
tmp = vec_ld(0, dest); \
205
tmp2 = (vec_s16) vec_perm(tmp, (vec_u8) zero, perm); \
206
tmp3 = vec_adds(tmp2, src); \
207
tmp = vec_packsu(tmp3, tmp3); \
208
vec_ste((vec_u32) tmp, 0, (unsigned int *) dest); \
209
vec_ste((vec_u32) tmp, 4, (unsigned int *) dest)
211
ADD(dest, vx0, perm0);
213
ADD(dest, vx1, perm1);
215
ADD(dest, vx2, perm0);
217
ADD(dest, vx3, perm1);
219
ADD(dest, vx4, perm0);
221
ADD(dest, vx5, perm1);
223
ADD(dest, vx6, perm0);
225
ADD(dest, vx7, perm1);
228
#endif /* HAVE_ALTIVEC */
230
av_cold void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx,
231
unsigned high_bit_depth)
234
if (!PPC_ALTIVEC(av_get_cpu_flags()))
237
if (!high_bit_depth) {
238
if ((avctx->idct_algo == FF_IDCT_AUTO) ||
239
(avctx->idct_algo == FF_IDCT_ALTIVEC)) {
240
c->idct_add = idct_add_altivec;
241
c->idct_put = idct_put_altivec;
242
c->perm_type = FF_IDCT_PERM_TRANSPOSE;
245
#endif /* HAVE_ALTIVEC */