FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vp3dsp_altivec.c
Go to the documentation of this file.
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 <string.h>
22 
23 #include "config.h"
24 
25 #include "libavutil/attributes.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/ppc/cpu.h"
29 
30 #include "libavcodec/vp3dsp.h"
31 
32 #if HAVE_ALTIVEC
33 
34 static const vec_s16 constants =
35  {0, 64277, 60547, 54491, 46341, 36410, 25080, 12785};
36 #if HAVE_BIGENDIAN
37 static const vec_u8 interleave_high =
38  {0, 1, 16, 17, 4, 5, 20, 21, 8, 9, 24, 25, 12, 13, 28, 29};
39 #else
40 static const vec_u8 interleave_high =
41  {2, 3, 18, 19, 6, 7, 22, 23, 10, 11, 26, 27, 14, 15, 30, 31};
42 #endif
43 
44 #define IDCT_START \
45  vec_s16 A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;\
46  vec_s16 Ed, Gd, Add, Bdd, Fd, Hd;\
47  vec_s16 eight = vec_splat_s16(8);\
48  vec_u16 four = vec_splat_u16(4);\
49 \
50  vec_s16 C1 = vec_splat(constants, 1);\
51  vec_s16 C2 = vec_splat(constants, 2);\
52  vec_s16 C3 = vec_splat(constants, 3);\
53  vec_s16 C4 = vec_splat(constants, 4);\
54  vec_s16 C5 = vec_splat(constants, 5);\
55  vec_s16 C6 = vec_splat(constants, 6);\
56  vec_s16 C7 = vec_splat(constants, 7);\
57 \
58  vec_s16 b0 = vec_ld(0x00, block);\
59  vec_s16 b1 = vec_ld(0x10, block);\
60  vec_s16 b2 = vec_ld(0x20, block);\
61  vec_s16 b3 = vec_ld(0x30, block);\
62  vec_s16 b4 = vec_ld(0x40, block);\
63  vec_s16 b5 = vec_ld(0x50, block);\
64  vec_s16 b6 = vec_ld(0x60, block);\
65  vec_s16 b7 = vec_ld(0x70, block);
66 
67 // these functions do (a*C)>>16
68 // things are tricky because a is signed, but C unsigned.
69 // M15 is used if C fits in 15 bit unsigned (C6,C7)
70 // M16 is used if C requires 16 bits unsigned
71 static inline vec_s16 M15(vec_s16 a, vec_s16 C)
72 {
73  return (vec_s16)vec_perm(vec_mule(a,C), vec_mulo(a,C), interleave_high);
74 }
75 static inline vec_s16 M16(vec_s16 a, vec_s16 C)
76 {
77  return vec_add(a, M15(a, C));
78 }
79 
80 #define IDCT_1D(ADD, SHIFT)\
81  A = vec_add(M16(b1, C1), M15(b7, C7));\
82  B = vec_sub(M15(b1, C7), M16(b7, C1));\
83  C = vec_add(M16(b3, C3), M16(b5, C5));\
84  D = vec_sub(M16(b5, C3), M16(b3, C5));\
85 \
86  Ad = M16(vec_sub(A, C), C4);\
87  Bd = M16(vec_sub(B, D), C4);\
88 \
89  Cd = vec_add(A, C);\
90  Dd = vec_add(B, D);\
91 \
92  E = ADD(M16(vec_add(b0, b4), C4));\
93  F = ADD(M16(vec_sub(b0, b4), C4));\
94 \
95  G = vec_add(M16(b2, C2), M15(b6, C6));\
96  H = vec_sub(M15(b2, C6), M16(b6, C2));\
97 \
98  Ed = vec_sub(E, G);\
99  Gd = vec_add(E, G);\
100 \
101  Add = vec_add(F, Ad);\
102  Bdd = vec_sub(Bd, H);\
103 \
104  Fd = vec_sub(F, Ad);\
105  Hd = vec_add(Bd, H);\
106 \
107  b0 = SHIFT(vec_add(Gd, Cd));\
108  b7 = SHIFT(vec_sub(Gd, Cd));\
109 \
110  b1 = SHIFT(vec_add(Add, Hd));\
111  b2 = SHIFT(vec_sub(Add, Hd));\
112 \
113  b3 = SHIFT(vec_add(Ed, Dd));\
114  b4 = SHIFT(vec_sub(Ed, Dd));\
115 \
116  b5 = SHIFT(vec_add(Fd, Bdd));\
117  b6 = SHIFT(vec_sub(Fd, Bdd));
118 
119 #define NOP(a) a
120 #define ADD8(a) vec_add(a, eight)
121 #define SHIFT4(a) vec_sra(a, four)
122 
123 static void vp3_idct_put_altivec(uint8_t *dst, ptrdiff_t stride, int16_t block[64])
124 {
125  vec_u8 t;
126  IDCT_START
127 
128  // pixels are signed; so add 128*16 in addition to the normal 8
129  vec_s16 v2048 = vec_sl(vec_splat_s16(1), vec_splat_u16(11));
130  eight = vec_add(eight, v2048);
131 
132  IDCT_1D(NOP, NOP)
133  TRANSPOSE8(b0, b1, b2, b3, b4, b5, b6, b7);
134  IDCT_1D(ADD8, SHIFT4)
135 
136 #define PUT(a)\
137  t = vec_packsu(a, a);\
138  vec_ste((vec_u32)t, 0, (unsigned int *)dst);\
139  vec_ste((vec_u32)t, 4, (unsigned int *)dst);
140 
141  PUT(b0) dst += stride;
142  PUT(b1) dst += stride;
143  PUT(b2) dst += stride;
144  PUT(b3) dst += stride;
145  PUT(b4) dst += stride;
146  PUT(b5) dst += stride;
147  PUT(b6) dst += stride;
148  PUT(b7)
149  memset(block, 0, sizeof(*block) * 64);
150 }
151 
152 static void vp3_idct_add_altivec(uint8_t *dst, ptrdiff_t stride, int16_t block[64])
153 {
154  LOAD_ZERO;
155  vec_u8 t, vdst;
156  vec_s16 vdst_16;
157  vec_u8 vdst_mask = vec_mergeh(vec_splat_u8(-1), vec_lvsl(0, dst));
158 
159  IDCT_START
160 
161  IDCT_1D(NOP, NOP)
162  TRANSPOSE8(b0, b1, b2, b3, b4, b5, b6, b7);
163  IDCT_1D(ADD8, SHIFT4)
164 
165 #if HAVE_BIGENDIAN
166 #define GET_VDST16\
167  vdst = vec_ld(0, dst);\
168  vdst_16 = (vec_s16)vec_perm(vdst, zero_u8v, vdst_mask);
169 #else
170 #define GET_VDST16\
171  vdst = vec_vsx_ld(0,dst);\
172  vdst_16 = (vec_s16)vec_mergeh(vdst, zero_u8v);
173 #endif
174 
175 #define ADD(a)\
176  GET_VDST16;\
177  vdst_16 = vec_adds(a, vdst_16);\
178  t = vec_packsu(vdst_16, vdst_16);\
179  vec_ste((vec_u32)t, 0, (unsigned int *)dst);\
180  vec_ste((vec_u32)t, 4, (unsigned int *)dst);
181 
182  ADD(b0) dst += stride;
183  ADD(b1) dst += stride;
184  ADD(b2) dst += stride;
185  ADD(b3) dst += stride;
186  ADD(b4) dst += stride;
187  ADD(b5) dst += stride;
188  ADD(b6) dst += stride;
189  ADD(b7)
190  memset(block, 0, sizeof(*block) * 64);
191 }
192 
193 #endif /* HAVE_ALTIVEC */
194 
196 {
197 #if HAVE_ALTIVEC
199  return;
200 
201  c->idct_put = vp3_idct_put_altivec;
202  c->idct_add = vp3_idct_add_altivec;
203 #endif
204 }
#define C
static const struct @236 constants[]
#define LOAD_ZERO
Definition: util_altivec.h:49
Macro definitions for various function/variable attributes.
static int16_t block[64]
Definition: dct.c:115
uint8_t
#define av_cold
Definition: attributes.h:82
static int flags
Definition: log.c:57
#define vec_s16
Definition: util_altivec.h:41
#define ADD(a, b)
#define PPC_ALTIVEC(flags)
Definition: cpu.h:26
#define vec_u8
Definition: util_altivec.h:38
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:90
Contains misc utility macros and inline functions.
void(* idct_put)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: vp3dsp.h:41
void(* idct_add)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: vp3dsp.h:42
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
static double c[64]
av_cold void ff_vp3dsp_init_ppc(VP3DSPContext *c, int flags)