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"
34 #define IdctAdjustBeforeShift 8
43 #define M(a,b) (((a) * (b))>>16)
45 static av_always_inline void idct(uint8_t *dst, int stride, int16_t *input, int type)
49 int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;
50 int Ed, Gd, Add, Bdd, Fd, Hd;
54 /* Inverse DCT on the rows now */
55 for (i = 0; i < 8; i++) {
56 /* Check for non-zero values */
57 if ( ip[0 * 8] | ip[1 * 8] | ip[2 * 8] | ip[3 * 8] |
58 ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8] ) {
59 A = M(xC1S7, ip[1 * 8]) + M(xC7S1, ip[7 * 8]);
60 B = M(xC7S1, ip[1 * 8]) - M(xC1S7, ip[7 * 8]);
61 C = M(xC3S5, ip[3 * 8]) + M(xC5S3, ip[5 * 8]);
62 D = M(xC3S5, ip[5 * 8]) - M(xC5S3, ip[3 * 8]);
64 Ad = M(xC4S4, (A - C));
65 Bd = M(xC4S4, (B - D));
70 E = M(xC4S4, (ip[0 * 8] + ip[4 * 8]));
71 F = M(xC4S4, (ip[0 * 8] - ip[4 * 8]));
73 G = M(xC2S6, ip[2 * 8]) + M(xC6S2, ip[6 * 8]);
74 H = M(xC6S2, ip[2 * 8]) - M(xC2S6, ip[6 * 8]);
85 /* Final sequence of operations over-write original inputs. */
99 ip += 1; /* next row */
104 for ( i = 0; i < 8; i++) {
105 /* Check for non-zero values (bitwise or faster than ||) */
106 if ( ip[1] | ip[2] | ip[3] |
107 ip[4] | ip[5] | ip[6] | ip[7] ) {
109 A = M(xC1S7, ip[1]) + M(xC7S1, ip[7]);
110 B = M(xC7S1, ip[1]) - M(xC1S7, ip[7]);
111 C = M(xC3S5, ip[3]) + M(xC5S3, ip[5]);
112 D = M(xC3S5, ip[5]) - M(xC5S3, ip[3]);
114 Ad = M(xC4S4, (A - C));
115 Bd = M(xC4S4, (B - D));
120 E = M(xC4S4, (ip[0] + ip[4])) + 8;
121 F = M(xC4S4, (ip[0] - ip[4])) + 8;
128 G = M(xC2S6, ip[2]) + M(xC6S2, ip[6]);
129 H = M(xC6S2, ip[2]) - M(xC2S6, ip[6]);
140 /* Final sequence of operations over-write original inputs. */
142 dst[0*stride] = av_clip_uint8((Gd + Cd ) >> 4);
143 dst[7*stride] = av_clip_uint8((Gd - Cd ) >> 4);
145 dst[1*stride] = av_clip_uint8((Add + Hd ) >> 4);
146 dst[2*stride] = av_clip_uint8((Add - Hd ) >> 4);
148 dst[3*stride] = av_clip_uint8((Ed + Dd ) >> 4);
149 dst[4*stride] = av_clip_uint8((Ed - Dd ) >> 4);
151 dst[5*stride] = av_clip_uint8((Fd + Bdd ) >> 4);
152 dst[6*stride] = av_clip_uint8((Fd - Bdd ) >> 4);
154 dst[0*stride] = av_clip_uint8(dst[0*stride] + ((Gd + Cd ) >> 4));
155 dst[7*stride] = av_clip_uint8(dst[7*stride] + ((Gd - Cd ) >> 4));
157 dst[1*stride] = av_clip_uint8(dst[1*stride] + ((Add + Hd ) >> 4));
158 dst[2*stride] = av_clip_uint8(dst[2*stride] + ((Add - Hd ) >> 4));
160 dst[3*stride] = av_clip_uint8(dst[3*stride] + ((Ed + Dd ) >> 4));
161 dst[4*stride] = av_clip_uint8(dst[4*stride] + ((Ed - Dd ) >> 4));
163 dst[5*stride] = av_clip_uint8(dst[5*stride] + ((Fd + Bdd ) >> 4));
164 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++) {
239 (first_pixel[2 * nstride] - first_pixel[ stride])
240 +3*(first_pixel[0 ] - first_pixel[nstride]);
241 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) {
255 (first_pixel[-2] - first_pixel[ 1])
256 +3*(first_pixel[ 0] - first_pixel[-1]);
257 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_bfin(c, flags);
295 ff_vp3dsp_init_ppc(c, flags);
297 ff_vp3dsp_init_x86(c, flags);