2 * Copyright (C) 2009 David Conrad
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavcodec/dsputil.h"
22 #include "util_altivec.h"
23 #include "types_altivec.h"
24 #include "dsputil_altivec.h"
26 static const vec_s16 constants =
27 {0, 64277, 60547, 54491, 46341, 36410, 25080, 12785};
28 static const vec_u8 interleave_high =
29 {0, 1, 16, 17, 4, 5, 20, 21, 8, 9, 24, 25, 12, 13, 28, 29};
32 vec_s16 A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;\
33 vec_s16 Ed, Gd, Add, Bdd, Fd, Hd;\
34 vec_s16 eight = vec_splat_s16(8);\
35 vec_u16 four = vec_splat_u16(4);\
37 vec_s16 C1 = vec_splat(constants, 1);\
38 vec_s16 C2 = vec_splat(constants, 2);\
39 vec_s16 C3 = vec_splat(constants, 3);\
40 vec_s16 C4 = vec_splat(constants, 4);\
41 vec_s16 C5 = vec_splat(constants, 5);\
42 vec_s16 C6 = vec_splat(constants, 6);\
43 vec_s16 C7 = vec_splat(constants, 7);\
45 vec_s16 b0 = vec_ld(0x00, block);\
46 vec_s16 b1 = vec_ld(0x10, block);\
47 vec_s16 b2 = vec_ld(0x20, block);\
48 vec_s16 b3 = vec_ld(0x30, block);\
49 vec_s16 b4 = vec_ld(0x40, block);\
50 vec_s16 b5 = vec_ld(0x50, block);\
51 vec_s16 b6 = vec_ld(0x60, block);\
52 vec_s16 b7 = vec_ld(0x70, block);
54 // these functions do (a*C)>>16
55 // things are tricky because a is signed, but C unsigned.
56 // M15 is used if C fits in 15 bit unsigned (C6,C7)
57 // M16 is used if C requires 16 bits unsigned
58 static inline vec_s16 M15(vec_s16 a, vec_s16 C)
60 return (vec_s16)vec_perm(vec_mule(a,C), vec_mulo(a,C), interleave_high);
62 static inline vec_s16 M16(vec_s16 a, vec_s16 C)
64 return vec_add(a, M15(a, C));
67 #define IDCT_1D(ADD, SHIFT)\
68 A = vec_add(M16(b1, C1), M15(b7, C7));\
69 B = vec_sub(M15(b1, C7), M16(b7, C1));\
70 C = vec_add(M16(b3, C3), M16(b5, C5));\
71 D = vec_sub(M16(b5, C3), M16(b3, C5));\
73 Ad = M16(vec_sub(A, C), C4);\
74 Bd = M16(vec_sub(B, D), C4);\
79 E = ADD(M16(vec_add(b0, b4), C4));\
80 F = ADD(M16(vec_sub(b0, b4), C4));\
82 G = vec_add(M16(b2, C2), M15(b6, C6));\
83 H = vec_sub(M15(b2, C6), M16(b6, C2));\
88 Add = vec_add(F, Ad);\
89 Bdd = vec_sub(Bd, H);\
94 b0 = SHIFT(vec_add(Gd, Cd));\
95 b7 = SHIFT(vec_sub(Gd, Cd));\
97 b1 = SHIFT(vec_add(Add, Hd));\
98 b2 = SHIFT(vec_sub(Add, Hd));\
100 b3 = SHIFT(vec_add(Ed, Dd));\
101 b4 = SHIFT(vec_sub(Ed, Dd));\
103 b5 = SHIFT(vec_add(Fd, Bdd));\
104 b6 = SHIFT(vec_sub(Fd, Bdd));
107 #define ADD8(a) vec_add(a, eight)
108 #define SHIFT4(a) vec_sra(a, four)
110 void ff_vp3_idct_altivec(DCTELEM block[64])
115 TRANSPOSE8(b0, b1, b2, b3, b4, b5, b6, b7);
116 IDCT_1D(ADD8, SHIFT4)
118 vec_st(b0, 0x00, block);
119 vec_st(b1, 0x10, block);
120 vec_st(b2, 0x20, block);
121 vec_st(b3, 0x30, block);
122 vec_st(b4, 0x40, block);
123 vec_st(b5, 0x50, block);
124 vec_st(b6, 0x60, block);
125 vec_st(b7, 0x70, block);
128 void ff_vp3_idct_put_altivec(uint8_t *dst, int stride, DCTELEM block[64])
133 // pixels are signed; so add 128*16 in addition to the normal 8
134 vec_s16 v2048 = vec_sl(vec_splat_s16(1), vec_splat_u16(11));
135 eight = vec_add(eight, v2048);
138 TRANSPOSE8(b0, b1, b2, b3, b4, b5, b6, b7);
139 IDCT_1D(ADD8, SHIFT4)
142 t = vec_packsu(a, a);\
143 vec_ste((vec_u32)t, 0, (unsigned int *)dst);\
144 vec_ste((vec_u32)t, 4, (unsigned int *)dst);
146 PUT(b0) dst += stride;
147 PUT(b1) dst += stride;
148 PUT(b2) dst += stride;
149 PUT(b3) dst += stride;
150 PUT(b4) dst += stride;
151 PUT(b5) dst += stride;
152 PUT(b6) dst += stride;
156 void ff_vp3_idct_add_altivec(uint8_t *dst, int stride, DCTELEM block[64])
161 vec_u8 vdst_mask = vec_mergeh(vec_splat_u8(-1), vec_lvsl(0, dst));
166 TRANSPOSE8(b0, b1, b2, b3, b4, b5, b6, b7);
167 IDCT_1D(ADD8, SHIFT4)
170 vdst = vec_ld(0, dst);\
171 vdst_16 = (vec_s16)vec_perm(vdst, zero_u8v, vdst_mask);\
172 vdst_16 = vec_adds(a, vdst_16);\
173 t = vec_packsu(vdst_16, vdst_16);\
174 vec_ste((vec_u32)t, 0, (unsigned int *)dst);\
175 vec_ste((vec_u32)t, 4, (unsigned int *)dst);
177 ADD(b0) dst += stride;
178 ADD(b1) dst += stride;
179 ADD(b2) dst += stride;
180 ADD(b3) dst += stride;
181 ADD(b4) dst += stride;
182 ADD(b5) dst += stride;
183 ADD(b6) dst += stride;