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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 
25 #include "libavutil/attributes.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/ppc/cpu.h"
29 
30 #include "libavcodec/avcodec.h"
31 #include "libavcodec/pixblockdsp.h"
32 
33 #if HAVE_ALTIVEC
34 
35 #if HAVE_VSX
36 static void get_pixels_altivec(int16_t *restrict block, const uint8_t *pixels,
37  ptrdiff_t stride)
38 {
39  int i;
40  vector unsigned char perm =
41  (vector unsigned char) {0x00,0x10, 0x01,0x11,0x02,0x12,0x03,0x13,\
42  0x04,0x14,0x05,0x15,0x06,0x16,0x07,0x17};
43  const vector unsigned char zero =
44  (const vector unsigned char) vec_splat_u8(0);
45 
46  for (i = 0; i < 8; i++) {
47  /* Read potentially unaligned pixels.
48  * We're reading 16 pixels, and actually only want 8,
49  * but we simply ignore the extras. */
50  vector unsigned char bytes = vec_vsx_ld(0, pixels);
51 
52  // Convert the bytes into shorts.
53  //vector signed short shorts = (vector signed short) vec_perm(zero, bytes, perm);
54  vector signed short shorts = (vector signed short) vec_perm(bytes, zero, perm);
55 
56  // Save the data to the block, we assume the block is 16-byte aligned.
57  vec_vsx_st(shorts, i * 16, (vector signed short *) block);
58 
59  pixels += stride;
60  }
61 }
62 #else
63 static void get_pixels_altivec(int16_t *restrict block, const uint8_t *pixels,
64  ptrdiff_t stride)
65 {
66  int i;
67  const vec_u8 zero = (const vec_u8)vec_splat_u8(0);
68 
69  for (i = 0; i < 8; i++) {
70  vec_u8 perm = vec_lvsl(0, pixels);
71  /* Read potentially unaligned pixels.
72  * We're reading 16 pixels, and actually only want 8,
73  * but we simply ignore the extras. */
74  vec_u8 pixl = vec_ld(0, pixels);
75  vec_u8 pixr = vec_ld(7, pixels);
76  vec_u8 bytes = vec_perm(pixl, pixr, perm);
77 
78  // Convert the bytes into shorts.
79  vec_s16 shorts = (vec_s16)vec_mergeh(zero, bytes);
80 
81  // Save the data to the block, we assume the block is 16-byte aligned.
82  vec_st(shorts, i * 16, (vec_s16 *)block);
83 
84  pixels += stride;
85  }
86 }
87 
88 #endif /* HAVE_VSX */
89 
90 #if HAVE_VSX
91 static void diff_pixels_altivec(int16_t *restrict block, const uint8_t *s1,
92  const uint8_t *s2, ptrdiff_t stride)
93 {
94  int i;
95  const vector unsigned char zero =
96  (const vector unsigned char) vec_splat_u8(0);
97  vector signed short shorts1, shorts2;
98 
99  for (i = 0; i < 4; i++) {
100  /* Read potentially unaligned pixels.
101  * We're reading 16 pixels, and actually only want 8,
102  * but we simply ignore the extras. */
103  vector unsigned char bytes = vec_vsx_ld(0, s1);
104 
105  // Convert the bytes into shorts.
106  shorts1 = (vector signed short) vec_mergeh(bytes, zero);
107 
108  // Do the same for the second block of pixels.
109  bytes =vec_vsx_ld(0, s2);
110 
111  // Convert the bytes into shorts.
112  shorts2 = (vector signed short) vec_mergeh(bytes, zero);
113 
114  // Do the subtraction.
115  shorts1 = vec_sub(shorts1, shorts2);
116 
117  // Save the data to the block, we assume the block is 16-byte aligned.
118  vec_vsx_st(shorts1, 0, (vector signed short *) block);
119 
120  s1 += stride;
121  s2 += stride;
122  block += 8;
123 
124  /* The code below is a copy of the code above...
125  * This is a manual unroll. */
126 
127  /* Read potentially unaligned pixels.
128  * We're reading 16 pixels, and actually only want 8,
129  * but we simply ignore the extras. */
130  bytes = vec_vsx_ld(0, s1);
131 
132  // Convert the bytes into shorts.
133  shorts1 = (vector signed short) vec_mergeh(bytes, zero);
134 
135  // Do the same for the second block of pixels.
136  bytes = vec_vsx_ld(0, s2);
137 
138  // Convert the bytes into shorts.
139  shorts2 = (vector signed short) vec_mergeh(bytes, zero);
140 
141  // Do the subtraction.
142  shorts1 = vec_sub(shorts1, shorts2);
143 
144  // Save the data to the block, we assume the block is 16-byte aligned.
145  vec_vsx_st(shorts1, 0, (vector signed short *) block);
146 
147  s1 += stride;
148  s2 += stride;
149  block += 8;
150  }
151 }
152 #else
153 static void diff_pixels_altivec(int16_t *restrict block, const uint8_t *s1,
154  const uint8_t *s2, ptrdiff_t stride)
155 {
156  int i;
157  vec_u8 perm;
158  const vec_u8 zero = (const vec_u8)vec_splat_u8(0);
159  vec_s16 shorts1, shorts2;
160 
161  for (i = 0; i < 4; i++) {
162  /* Read potentially unaligned pixels.
163  * We're reading 16 pixels, and actually only want 8,
164  * but we simply ignore the extras. */
165  perm = vec_lvsl(0, s1);
166  vec_u8 pixl = vec_ld(0, s1);
167  vec_u8 pixr = vec_ld(15, s1);
168  vec_u8 bytes = vec_perm(pixl, pixr, perm);
169 
170  // Convert the bytes into shorts.
171  shorts1 = (vec_s16)vec_mergeh(zero, bytes);
172 
173  // Do the same for the second block of pixels.
174  perm = vec_lvsl(0, s2);
175  pixl = vec_ld(0, s2);
176  pixr = vec_ld(15, s2);
177  bytes = vec_perm(pixl, pixr, perm);
178 
179  // Convert the bytes into shorts.
180  shorts2 = (vec_s16)vec_mergeh(zero, bytes);
181 
182  // Do the subtraction.
183  shorts1 = vec_sub(shorts1, shorts2);
184 
185  // Save the data to the block, we assume the block is 16-byte aligned.
186  vec_st(shorts1, 0, (vec_s16 *)block);
187 
188  s1 += stride;
189  s2 += stride;
190  block += 8;
191 
192  /* The code below is a copy of the code above...
193  * This is a manual unroll. */
194 
195  /* Read potentially unaligned pixels.
196  * We're reading 16 pixels, and actually only want 8,
197  * but we simply ignore the extras. */
198  perm = vec_lvsl(0, s1);
199  pixl = vec_ld(0, s1);
200  pixr = vec_ld(15, s1);
201  bytes = vec_perm(pixl, pixr, perm);
202 
203  // Convert the bytes into shorts.
204  shorts1 = (vec_s16)vec_mergeh(zero, bytes);
205 
206  // Do the same for the second block of pixels.
207  perm = vec_lvsl(0, s2);
208  pixl = vec_ld(0, s2);
209  pixr = vec_ld(15, s2);
210  bytes = vec_perm(pixl, pixr, perm);
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 stride)
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 += stride;
242  }
243 }
244 
245 static void diff_pixels_vsx(int16_t *restrict block, const uint8_t *s1,
246  const uint8_t *s2, ptrdiff_t 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.
static int16_t block[64]
Definition: dct.c:115
uint8_t
#define av_cold
Definition: attributes.h:82
void(* diff_pixels)(int16_t *av_restrict block, const uint8_t *s1, const uint8_t *s2, ptrdiff_t stride)
Definition: pixblockdsp.h:32
#define vec_s16
Definition: util_altivec.h:37
#define s2
Definition: regdef.h:39
#define PPC_ALTIVEC(flags)
Definition: cpu.h:26
void(* get_pixels)(int16_t *av_restrict block, const uint8_t *pixels, ptrdiff_t stride)
Definition: pixblockdsp.h:29
#define zero
Definition: regdef.h:64
perm
Definition: f_perms.c:74
#define vec_u8
Definition: util_altivec.h:34
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1488
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:92
Contains misc utility macros and inline functions.
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
static double c[64]
int pixels
Definition: avisynth_c.h:429
#define stride