2 * Copyright (c) 2004 The FFmpeg Project
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
23 * Standard C DSP-oriented functions cribbed from the original VP3
27 #include "libavutil/attributes.h"
28 #include "libavutil/common.h"
29 #include "libavutil/intreadwrite.h"
35 #define IdctAdjustBeforeShift 8
44 #define M(a, b) (((a) * (b)) >> 16)
46 static av_always_inline
void idct(uint8_t *dst
, int stride
,
47 int16_t *input
, int type
)
51 int A
, B
, C
, D
, Ad
, Bd
, Cd
, Dd
, E
, F
, G
, H
;
52 int Ed
, Gd
, Add
, Bdd
, Fd
, Hd
;
56 /* Inverse DCT on the rows now */
57 for (i
= 0; i
< 8; i
++) {
58 /* Check for non-zero values */
59 if (ip
[0 * 8] | ip
[1 * 8] | ip
[2 * 8] | ip
[3 * 8] |
60 ip
[4 * 8] | ip
[5 * 8] | ip
[6 * 8] | ip
[7 * 8]) {
61 A
= M(xC1S7
, ip
[1 * 8]) + M(xC7S1
, ip
[7 * 8]);
62 B
= M(xC7S1
, ip
[1 * 8]) - M(xC1S7
, ip
[7 * 8]);
63 C
= M(xC3S5
, ip
[3 * 8]) + M(xC5S3
, ip
[5 * 8]);
64 D
= M(xC3S5
, ip
[5 * 8]) - M(xC5S3
, ip
[3 * 8]);
66 Ad
= M(xC4S4
, (A
- C
));
67 Bd
= M(xC4S4
, (B
- D
));
72 E
= M(xC4S4
, (ip
[0 * 8] + ip
[4 * 8]));
73 F
= M(xC4S4
, (ip
[0 * 8] - ip
[4 * 8]));
75 G
= M(xC2S6
, ip
[2 * 8]) + M(xC6S2
, ip
[6 * 8]);
76 H
= M(xC6S2
, ip
[2 * 8]) - M(xC2S6
, ip
[6 * 8]);
87 /* Final sequence of operations over-write original inputs. */
101 ip
+= 1; /* next row */
106 for (i
= 0; i
< 8; i
++) {
107 /* Check for non-zero values (bitwise or faster than ||) */
108 if (ip
[1] | ip
[2] | ip
[3] |
109 ip
[4] | ip
[5] | ip
[6] | ip
[7]) {
110 A
= M(xC1S7
, ip
[1]) + M(xC7S1
, ip
[7]);
111 B
= M(xC7S1
, ip
[1]) - M(xC1S7
, ip
[7]);
112 C
= M(xC3S5
, ip
[3]) + M(xC5S3
, ip
[5]);
113 D
= M(xC3S5
, ip
[5]) - M(xC5S3
, ip
[3]);
115 Ad
= M(xC4S4
, (A
- C
));
116 Bd
= M(xC4S4
, (B
- D
));
121 E
= M(xC4S4
, (ip
[0] + ip
[4])) + 8;
122 F
= M(xC4S4
, (ip
[0] - ip
[4])) + 8;
124 if (type
== 1) { // HACK
129 G
= M(xC2S6
, ip
[2]) + M(xC6S2
, ip
[6]);
130 H
= M(xC6S2
, ip
[2]) - M(xC2S6
, ip
[6]);
141 /* Final sequence of operations over-write original inputs. */
143 dst
[0 * stride
] = av_clip_uint8((Gd
+ Cd
) >> 4);
144 dst
[7 * stride
] = av_clip_uint8((Gd
- Cd
) >> 4);
146 dst
[1 * stride
] = av_clip_uint8((Add
+ Hd
) >> 4);
147 dst
[2 * stride
] = av_clip_uint8((Add
- Hd
) >> 4);
149 dst
[3 * stride
] = av_clip_uint8((Ed
+ Dd
) >> 4);
150 dst
[4 * stride
] = av_clip_uint8((Ed
- Dd
) >> 4);
152 dst
[5 * stride
] = av_clip_uint8((Fd
+ Bdd
) >> 4);
153 dst
[6 * stride
] = av_clip_uint8((Fd
- Bdd
) >> 4);
155 dst
[0 * stride
] = av_clip_uint8(dst
[0 * stride
] + ((Gd
+ Cd
) >> 4));
156 dst
[7 * stride
] = av_clip_uint8(dst
[7 * stride
] + ((Gd
- Cd
) >> 4));
158 dst
[1 * stride
] = av_clip_uint8(dst
[1 * stride
] + ((Add
+ Hd
) >> 4));
159 dst
[2 * stride
] = av_clip_uint8(dst
[2 * stride
] + ((Add
- Hd
) >> 4));
161 dst
[3 * stride
] = av_clip_uint8(dst
[3 * stride
] + ((Ed
+ Dd
) >> 4));
162 dst
[4 * stride
] = av_clip_uint8(dst
[4 * stride
] + ((Ed
- Dd
) >> 4));
164 dst
[5 * stride
] = av_clip_uint8(dst
[5 * stride
] + ((Fd
+ Bdd
) >> 4));
165 dst
[6 * stride
] = av_clip_uint8(dst
[6 * stride
] + ((Fd
- Bdd
) >> 4));
176 dst
[7*stride
] = av_clip_uint8(128 + ((xC4S4
* ip
[0] + (IdctAdjustBeforeShift
<< 16)) >> 20));
179 int v
= (xC4S4
* ip
[0] + (IdctAdjustBeforeShift
<< 16)) >> 20;
180 dst
[0 * stride
] = av_clip_uint8(dst
[0 * stride
] + v
);
181 dst
[1 * stride
] = av_clip_uint8(dst
[1 * stride
] + v
);
182 dst
[2 * stride
] = av_clip_uint8(dst
[2 * stride
] + v
);
183 dst
[3 * stride
] = av_clip_uint8(dst
[3 * stride
] + v
);
184 dst
[4 * stride
] = av_clip_uint8(dst
[4 * stride
] + v
);
185 dst
[5 * stride
] = av_clip_uint8(dst
[5 * stride
] + v
);
186 dst
[6 * stride
] = av_clip_uint8(dst
[6 * stride
] + v
);
187 dst
[7 * stride
] = av_clip_uint8(dst
[7 * stride
] + v
);
192 ip
+= 8; /* next column */
197 static void vp3_idct_put_c(uint8_t *dest
/* align 8 */, int line_size
,
198 int16_t *block
/* align 16 */)
200 idct(dest
, line_size
, block
, 1);
201 memset(block
, 0, sizeof(*block
) * 64);
204 static void vp3_idct_add_c(uint8_t *dest
/* align 8 */, int line_size
,
205 int16_t *block
/* align 16 */)
207 idct(dest
, line_size
, block
, 2);
208 memset(block
, 0, sizeof(*block
) * 64);
211 static void vp3_idct_dc_add_c(uint8_t *dest
/* align 8 */, int line_size
,
212 int16_t *block
/* align 16 */)
214 int i
, dc
= (block
[0] + 15) >> 5;
216 for (i
= 0; i
< 8; i
++) {
217 dest
[0] = av_clip_uint8(dest
[0] + dc
);
218 dest
[1] = av_clip_uint8(dest
[1] + dc
);
219 dest
[2] = av_clip_uint8(dest
[2] + dc
);
220 dest
[3] = av_clip_uint8(dest
[3] + dc
);
221 dest
[4] = av_clip_uint8(dest
[4] + dc
);
222 dest
[5] = av_clip_uint8(dest
[5] + dc
);
223 dest
[6] = av_clip_uint8(dest
[6] + dc
);
224 dest
[7] = av_clip_uint8(dest
[7] + dc
);
230 static void vp3_v_loop_filter_c(uint8_t *first_pixel
, int stride
,
231 int *bounding_values
)
235 const int nstride
= -stride
;
237 for (end
= first_pixel
+ 8; first_pixel
< end
; first_pixel
++) {
238 filter_value
= (first_pixel
[2 * nstride
] - first_pixel
[stride
]) +
239 (first_pixel
[0] - first_pixel
[nstride
]) * 3;
240 filter_value
= bounding_values
[(filter_value
+ 4) >> 3];
242 first_pixel
[nstride
] = av_clip_uint8(first_pixel
[nstride
] + filter_value
);
243 first_pixel
[0] = av_clip_uint8(first_pixel
[0] - filter_value
);
247 static void vp3_h_loop_filter_c(uint8_t *first_pixel
, int stride
,
248 int *bounding_values
)
253 for (end
= first_pixel
+ 8 * stride
; first_pixel
!= end
; first_pixel
+= stride
) {
254 filter_value
= (first_pixel
[-2] - first_pixel
[1]) +
255 (first_pixel
[ 0] - first_pixel
[-1]) * 3;
256 filter_value
= bounding_values
[(filter_value
+ 4) >> 3];
258 first_pixel
[-1] = av_clip_uint8(first_pixel
[-1] + filter_value
);
259 first_pixel
[ 0] = av_clip_uint8(first_pixel
[ 0] - filter_value
);
263 static void put_no_rnd_pixels_l2(uint8_t *dst
, const uint8_t *src1
,
264 const uint8_t *src2
, ptrdiff_t stride
, int h
)
268 for (i
= 0; i
< h
; i
++) {
271 a
= AV_RN32(&src1
[i
* stride
]);
272 b
= AV_RN32(&src2
[i
* stride
]);
273 AV_WN32A(&dst
[i
* stride
], no_rnd_avg32(a
, b
));
274 a
= AV_RN32(&src1
[i
* stride
+ 4]);
275 b
= AV_RN32(&src2
[i
* stride
+ 4]);
276 AV_WN32A(&dst
[i
* stride
+ 4], no_rnd_avg32(a
, b
));
280 av_cold
void ff_vp3dsp_init(VP3DSPContext
*c
, int flags
)
282 c
->put_no_rnd_pixels_l2
= put_no_rnd_pixels_l2
;
284 c
->idct_put
= vp3_idct_put_c
;
285 c
->idct_add
= vp3_idct_add_c
;
286 c
->idct_dc_add
= vp3_idct_dc_add_c
;
287 c
->v_loop_filter
= vp3_v_loop_filter_c
;
288 c
->h_loop_filter
= vp3_h_loop_filter_c
;
291 ff_vp3dsp_init_arm(c
, flags
);
293 ff_vp3dsp_init_ppc(c
, flags
);
295 ff_vp3dsp_init_x86(c
, flags
);