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pixblockdsp.c
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1 /*
2  * Copyright (c) 2002 Brian Foley
3  * Copyright (c) 2002 Dieter Shirley
4  * Copyright (c) 2003-2004 Romain Dolbeau <romain@dolbeau.org>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "config.h"
24 #if HAVE_ALTIVEC_H
25 #include <altivec.h>
26 #endif
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/cpu.h"
30 #include "libavutil/ppc/cpu.h"
33 #include "libavcodec/avcodec.h"
34 #include "libavcodec/pixblockdsp.h"
35 
36 #if HAVE_ALTIVEC
37 
38 #if HAVE_VSX
39 static void get_pixels_altivec(int16_t *restrict block, const uint8_t *pixels,
40  ptrdiff_t line_size)
41 {
42  int i;
43  vector unsigned char perm =
44  (vector unsigned char) {0x00,0x10, 0x01,0x11,0x02,0x12,0x03,0x13,\
45  0x04,0x14,0x05,0x15,0x06,0x16,0x07,0x17};
46  const vector unsigned char zero =
47  (const vector unsigned char) vec_splat_u8(0);
48 
49  for (i = 0; i < 8; i++) {
50  /* Read potentially unaligned pixels.
51  * We're reading 16 pixels, and actually only want 8,
52  * but we simply ignore the extras. */
53  vector unsigned char bytes = vec_vsx_ld(0, pixels);
54 
55  // Convert the bytes into shorts.
56  //vector signed short shorts = (vector signed short) vec_perm(zero, bytes, perm);
57  vector signed short shorts = (vector signed short) vec_perm(bytes, zero, perm);
58 
59  // Save the data to the block, we assume the block is 16-byte aligned.
60  vec_vsx_st(shorts, i * 16, (vector signed short *) block);
61 
62  pixels += line_size;
63  }
64 }
65 #else
66 static void get_pixels_altivec(int16_t *restrict block, const uint8_t *pixels,
67  ptrdiff_t line_size)
68 {
69  int i;
70  vec_u8 perm = vec_lvsl(0, pixels);
71  const vec_u8 zero = (const vec_u8)vec_splat_u8(0);
72 
73  for (i = 0; i < 8; i++) {
74  /* Read potentially unaligned pixels.
75  * We're reading 16 pixels, and actually only want 8,
76  * but we simply ignore the extras. */
77  vec_u8 pixl = vec_ld(0, pixels);
78  vec_u8 pixr = vec_ld(7, pixels);
79  vec_u8 bytes = vec_perm(pixl, pixr, perm);
80 
81  // Convert the bytes into shorts.
82  vec_s16 shorts = (vec_s16)vec_mergeh(zero, bytes);
83 
84  // Save the data to the block, we assume the block is 16-byte aligned.
85  vec_st(shorts, i * 16, (vec_s16 *)block);
86 
87  pixels += line_size;
88  }
89 }
90 
91 #endif /* HAVE_VSX */
92 
93 #if HAVE_VSX
94 static void diff_pixels_altivec(int16_t *restrict block, const uint8_t *s1,
95  const uint8_t *s2, int stride)
96 {
97  int i;
98  const vector unsigned char zero =
99  (const vector unsigned char) vec_splat_u8(0);
100  vector signed short shorts1, shorts2;
101 
102  for (i = 0; i < 4; i++) {
103  /* Read potentially unaligned pixels.
104  * We're reading 16 pixels, and actually only want 8,
105  * but we simply ignore the extras. */
106  vector unsigned char bytes = vec_vsx_ld(0, s1);
107 
108  // Convert the bytes into shorts.
109  shorts1 = (vector signed short) vec_mergeh(bytes, zero);
110 
111  // Do the same for the second block of pixels.
112  bytes =vec_vsx_ld(0, s2);
113 
114  // Convert the bytes into shorts.
115  shorts2 = (vector signed short) vec_mergeh(bytes, zero);
116 
117  // Do the subtraction.
118  shorts1 = vec_sub(shorts1, shorts2);
119 
120  // Save the data to the block, we assume the block is 16-byte aligned.
121  vec_vsx_st(shorts1, 0, (vector signed short *) block);
122 
123  s1 += stride;
124  s2 += stride;
125  block += 8;
126 
127  /* The code below is a copy of the code above...
128  * This is a manual unroll. */
129 
130  /* Read potentially unaligned pixels.
131  * We're reading 16 pixels, and actually only want 8,
132  * but we simply ignore the extras. */
133  bytes = vec_vsx_ld(0, s1);
134 
135  // Convert the bytes into shorts.
136  shorts1 = (vector signed short) vec_mergeh(bytes, zero);
137 
138  // Do the same for the second block of pixels.
139  bytes = vec_vsx_ld(0, s2);
140 
141  // Convert the bytes into shorts.
142  shorts2 = (vector signed short) vec_mergeh(bytes, zero);
143 
144  // Do the subtraction.
145  shorts1 = vec_sub(shorts1, shorts2);
146 
147  // Save the data to the block, we assume the block is 16-byte aligned.
148  vec_vsx_st(shorts1, 0, (vector signed short *) block);
149 
150  s1 += stride;
151  s2 += stride;
152  block += 8;
153  }
154 }
155 #else
156 static void diff_pixels_altivec(int16_t *restrict block, const uint8_t *s1,
157  const uint8_t *s2, int stride)
158 {
159  int i;
160  vec_u8 perm1 = vec_lvsl(0, s1);
161  vec_u8 perm2 = vec_lvsl(0, s2);
162  const vec_u8 zero = (const vec_u8)vec_splat_u8(0);
163  vec_s16 shorts1, shorts2;
164 
165  for (i = 0; i < 4; i++) {
166  /* Read potentially unaligned pixels.
167  * We're reading 16 pixels, and actually only want 8,
168  * but we simply ignore the extras. */
169  vec_u8 pixl = vec_ld(0, s1);
170  vec_u8 pixr = vec_ld(15, s1);
171  vec_u8 bytes = vec_perm(pixl, pixr, perm1);
172 
173  // Convert the bytes into shorts.
174  shorts1 = (vec_s16)vec_mergeh(zero, bytes);
175 
176  // Do the same for the second block of pixels.
177  pixl = vec_ld(0, s2);
178  pixr = vec_ld(15, s2);
179  bytes = vec_perm(pixl, pixr, perm2);
180 
181  // Convert the bytes into shorts.
182  shorts2 = (vec_s16)vec_mergeh(zero, bytes);
183 
184  // Do the subtraction.
185  shorts1 = vec_sub(shorts1, shorts2);
186 
187  // Save the data to the block, we assume the block is 16-byte aligned.
188  vec_st(shorts1, 0, (vec_s16 *)block);
189 
190  s1 += stride;
191  s2 += stride;
192  block += 8;
193 
194  /* The code below is a copy of the code above...
195  * This is a manual unroll. */
196 
197  /* Read potentially unaligned pixels.
198  * We're reading 16 pixels, and actually only want 8,
199  * but we simply ignore the extras. */
200  pixl = vec_ld(0, s1);
201  pixr = vec_ld(15, s1);
202  bytes = vec_perm(pixl, pixr, perm1);
203 
204  // Convert the bytes into shorts.
205  shorts1 = (vec_s16)vec_mergeh(zero, bytes);
206 
207  // Do the same for the second block of pixels.
208  pixl = vec_ld(0, s2);
209  pixr = vec_ld(15, s2);
210  bytes = vec_perm(pixl, pixr, perm2);
211 
212  // Convert the bytes into shorts.
213  shorts2 = (vec_s16)vec_mergeh(zero, bytes);
214 
215  // Do the subtraction.
216  shorts1 = vec_sub(shorts1, shorts2);
217 
218  // Save the data to the block, we assume the block is 16-byte aligned.
219  vec_st(shorts1, 0, (vec_s16 *)block);
220 
221  s1 += stride;
222  s2 += stride;
223  block += 8;
224  }
225 }
226 
227 #endif /* HAVE_VSX */
228 
229 #endif /* HAVE_ALTIVEC */
230 
231 #if HAVE_VSX
232 static void get_pixels_vsx(int16_t *restrict block, const uint8_t *pixels,
233  ptrdiff_t line_size)
234 {
235  int i;
236  for (i = 0; i < 8; i++) {
237  vec_s16 shorts = vsx_ld_u8_s16(0, pixels);
238 
239  vec_vsx_st(shorts, i * 16, block);
240 
241  pixels += line_size;
242  }
243 }
244 
245 static void diff_pixels_vsx(int16_t *restrict block, const uint8_t *s1,
246  const uint8_t *s2, int stride)
247 {
248  int i;
249  vec_s16 shorts1, shorts2;
250  for (i = 0; i < 8; i++) {
251  shorts1 = vsx_ld_u8_s16(0, s1);
252  shorts2 = vsx_ld_u8_s16(0, s2);
253 
254  shorts1 = vec_sub(shorts1, shorts2);
255 
256  vec_vsx_st(shorts1, 0, block);
257 
258  s1 += stride;
259  s2 += stride;
260  block += 8;
261  }
262 }
263 #endif /* HAVE_VSX */
264 
266  AVCodecContext *avctx,
267  unsigned high_bit_depth)
268 {
269 #if HAVE_ALTIVEC
271  return;
272 
273  c->diff_pixels = diff_pixels_altivec;
274 
275  if (!high_bit_depth) {
276  c->get_pixels = get_pixels_altivec;
277  }
278 #endif /* HAVE_ALTIVEC */
279 
280 #if HAVE_VSX
281  if (!PPC_VSX(av_get_cpu_flags()))
282  return;
283 
284  c->diff_pixels = diff_pixels_vsx;
285 
286  if (!high_bit_depth)
287  c->get_pixels = get_pixels_vsx;
288 #endif /* HAVE_VSX */
289 }
#define PPC_VSX(flags)
Definition: cpu.h:27
Macro definitions for various function/variable attributes.
uint8_t
#define av_cold
Definition: attributes.h:82
void(* get_pixels)(int16_t *block, const uint8_t *pixels, ptrdiff_t line_size)
Definition: pixblockdsp.h:27
#define vec_s16
Definition: types_altivec.h:30
#define s2
Definition: regdef.h:39
#define PPC_ALTIVEC(flags)
Definition: cpu.h:26
#define zero
Definition: regdef.h:64
perm
Definition: f_perms.c:74
#define vec_u8
Definition: types_altivec.h:27
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1532
av_cold void ff_pixblockdsp_init_ppc(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: pixblockdsp.c:265
#define s1
Definition: regdef.h:38
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:76
Contains misc utility macros and inline functions.
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
static double c[64]
void(* diff_pixels)(int16_t *block, const uint8_t *s1, const uint8_t *s2, int stride)
Definition: pixblockdsp.h:30
int pixels
Definition: avisynth_c.h:298
#define stride
static int16_t block[64]
Definition: dct-test.c:112