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vp3dsp_altivec.c
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1 /*
2  * Copyright (C) 2009 David Conrad
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 "libavcodec/vp3dsp.h"
25 
26 #if HAVE_ALTIVEC
27 
30 #include "libavcodec/dsputil.h"
31 #include "dsputil_altivec.h"
32 
33 static const vec_s16 constants =
34  {0, 64277, 60547, 54491, 46341, 36410, 25080, 12785};
35 static const vec_u8 interleave_high =
36  {0, 1, 16, 17, 4, 5, 20, 21, 8, 9, 24, 25, 12, 13, 28, 29};
37 
38 #define IDCT_START \
39  vec_s16 A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;\
40  vec_s16 Ed, Gd, Add, Bdd, Fd, Hd;\
41  vec_s16 eight = vec_splat_s16(8);\
42  vec_u16 four = vec_splat_u16(4);\
43 \
44  vec_s16 C1 = vec_splat(constants, 1);\
45  vec_s16 C2 = vec_splat(constants, 2);\
46  vec_s16 C3 = vec_splat(constants, 3);\
47  vec_s16 C4 = vec_splat(constants, 4);\
48  vec_s16 C5 = vec_splat(constants, 5);\
49  vec_s16 C6 = vec_splat(constants, 6);\
50  vec_s16 C7 = vec_splat(constants, 7);\
51 \
52  vec_s16 b0 = vec_ld(0x00, block);\
53  vec_s16 b1 = vec_ld(0x10, block);\
54  vec_s16 b2 = vec_ld(0x20, block);\
55  vec_s16 b3 = vec_ld(0x30, block);\
56  vec_s16 b4 = vec_ld(0x40, block);\
57  vec_s16 b5 = vec_ld(0x50, block);\
58  vec_s16 b6 = vec_ld(0x60, block);\
59  vec_s16 b7 = vec_ld(0x70, block);
60 
61 // these functions do (a*C)>>16
62 // things are tricky because a is signed, but C unsigned.
63 // M15 is used if C fits in 15 bit unsigned (C6,C7)
64 // M16 is used if C requires 16 bits unsigned
65 static inline vec_s16 M15(vec_s16 a, vec_s16 C)
66 {
67  return (vec_s16)vec_perm(vec_mule(a,C), vec_mulo(a,C), interleave_high);
68 }
69 static inline vec_s16 M16(vec_s16 a, vec_s16 C)
70 {
71  return vec_add(a, M15(a, C));
72 }
73 
74 #define IDCT_1D(ADD, SHIFT)\
75  A = vec_add(M16(b1, C1), M15(b7, C7));\
76  B = vec_sub(M15(b1, C7), M16(b7, C1));\
77  C = vec_add(M16(b3, C3), M16(b5, C5));\
78  D = vec_sub(M16(b5, C3), M16(b3, C5));\
79 \
80  Ad = M16(vec_sub(A, C), C4);\
81  Bd = M16(vec_sub(B, D), C4);\
82 \
83  Cd = vec_add(A, C);\
84  Dd = vec_add(B, D);\
85 \
86  E = ADD(M16(vec_add(b0, b4), C4));\
87  F = ADD(M16(vec_sub(b0, b4), C4));\
88 \
89  G = vec_add(M16(b2, C2), M15(b6, C6));\
90  H = vec_sub(M15(b2, C6), M16(b6, C2));\
91 \
92  Ed = vec_sub(E, G);\
93  Gd = vec_add(E, G);\
94 \
95  Add = vec_add(F, Ad);\
96  Bdd = vec_sub(Bd, H);\
97 \
98  Fd = vec_sub(F, Ad);\
99  Hd = vec_add(Bd, H);\
100 \
101  b0 = SHIFT(vec_add(Gd, Cd));\
102  b7 = SHIFT(vec_sub(Gd, Cd));\
103 \
104  b1 = SHIFT(vec_add(Add, Hd));\
105  b2 = SHIFT(vec_sub(Add, Hd));\
106 \
107  b3 = SHIFT(vec_add(Ed, Dd));\
108  b4 = SHIFT(vec_sub(Ed, Dd));\
109 \
110  b5 = SHIFT(vec_add(Fd, Bdd));\
111  b6 = SHIFT(vec_sub(Fd, Bdd));
112 
113 #define NOP(a) a
114 #define ADD8(a) vec_add(a, eight)
115 #define SHIFT4(a) vec_sra(a, four)
116 
117 static void vp3_idct_put_altivec(uint8_t *dst, int stride, DCTELEM block[64])
118 {
119  vec_u8 t;
120  IDCT_START
121 
122  // pixels are signed; so add 128*16 in addition to the normal 8
123  vec_s16 v2048 = vec_sl(vec_splat_s16(1), vec_splat_u16(11));
124  eight = vec_add(eight, v2048);
125 
126  IDCT_1D(NOP, NOP)
127  TRANSPOSE8(b0, b1, b2, b3, b4, b5, b6, b7);
128  IDCT_1D(ADD8, SHIFT4)
129 
130 #define PUT(a)\
131  t = vec_packsu(a, a);\
132  vec_ste((vec_u32)t, 0, (unsigned int *)dst);\
133  vec_ste((vec_u32)t, 4, (unsigned int *)dst);
134 
135  PUT(b0) dst += stride;
136  PUT(b1) dst += stride;
137  PUT(b2) dst += stride;
138  PUT(b3) dst += stride;
139  PUT(b4) dst += stride;
140  PUT(b5) dst += stride;
141  PUT(b6) dst += stride;
142  PUT(b7)
143 }
144 
145 static void vp3_idct_add_altivec(uint8_t *dst, int stride, DCTELEM block[64])
146 {
147  LOAD_ZERO;
148  vec_u8 t, vdst;
149  vec_s16 vdst_16;
150  vec_u8 vdst_mask = vec_mergeh(vec_splat_u8(-1), vec_lvsl(0, dst));
151 
152  IDCT_START
153 
154  IDCT_1D(NOP, NOP)
155  TRANSPOSE8(b0, b1, b2, b3, b4, b5, b6, b7);
156  IDCT_1D(ADD8, SHIFT4)
157 
158 #define ADD(a)\
159  vdst = vec_ld(0, dst);\
160  vdst_16 = (vec_s16)vec_perm(vdst, zero_u8v, vdst_mask);\
161  vdst_16 = vec_adds(a, vdst_16);\
162  t = vec_packsu(vdst_16, vdst_16);\
163  vec_ste((vec_u32)t, 0, (unsigned int *)dst);\
164  vec_ste((vec_u32)t, 4, (unsigned int *)dst);
165 
166  ADD(b0) dst += stride;
167  ADD(b1) dst += stride;
168  ADD(b2) dst += stride;
169  ADD(b3) dst += stride;
170  ADD(b4) dst += stride;
171  ADD(b5) dst += stride;
172  ADD(b6) dst += stride;
173  ADD(b7)
174 }
175 
176 #endif /* HAVE_ALTIVEC */
177 
179 {
180 #if HAVE_ALTIVEC
182  c->idct_put = vp3_idct_put_altivec;
183  c->idct_add = vp3_idct_add_altivec;
185  }
186 #endif
187 }