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wmv2dsp.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/attributes.h"
20 #include "libavutil/common.h"
21 #include "avcodec.h"
22 #include "idctdsp.h"
23 #include "mathops.h"
24 #include "wmv2dsp.h"
25 
26 #define W0 2048
27 #define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */
28 #define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */
29 #define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */
30 #define W4 2048 /* 2048*sqrt (2)*cos (4*pi/16) */
31 #define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */
32 #define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */
33 #define W7 565 /* 2048*sqrt (2)*cos (7*pi/16) */
34 
35 static void wmv2_idct_row(short * b)
36 {
37  int s1, s2;
38  int a0, a1, a2, a3, a4, a5, a6, a7;
39 
40  /* step 1 */
41  a1 = W1 * b[1] + W7 * b[7];
42  a7 = W7 * b[1] - W1 * b[7];
43  a5 = W5 * b[5] + W3 * b[3];
44  a3 = W3 * b[5] - W5 * b[3];
45  a2 = W2 * b[2] + W6 * b[6];
46  a6 = W6 * b[2] - W2 * b[6];
47  a0 = W0 * b[0] + W0 * b[4];
48  a4 = W0 * b[0] - W0 * b[4];
49 
50  /* step 2 */
51  s1 = (181 * (a1 - a5 + a7 - a3) + 128) >> 8; // 1, 3, 5, 7
52  s2 = (181 * (a1 - a5 - a7 + a3) + 128) >> 8;
53 
54  /* step 3 */
55  b[0] = (a0 + a2 + a1 + a5 + (1 << 7)) >> 8;
56  b[1] = (a4 + a6 + s1 + (1 << 7)) >> 8;
57  b[2] = (a4 - a6 + s2 + (1 << 7)) >> 8;
58  b[3] = (a0 - a2 + a7 + a3 + (1 << 7)) >> 8;
59  b[4] = (a0 - a2 - a7 - a3 + (1 << 7)) >> 8;
60  b[5] = (a4 - a6 - s2 + (1 << 7)) >> 8;
61  b[6] = (a4 + a6 - s1 + (1 << 7)) >> 8;
62  b[7] = (a0 + a2 - a1 - a5 + (1 << 7)) >> 8;
63 }
64 
65 static void wmv2_idct_col(short * b)
66 {
67  int s1, s2;
68  int a0, a1, a2, a3, a4, a5, a6, a7;
69 
70  /* step 1, with extended precision */
71  a1 = (W1 * b[8 * 1] + W7 * b[8 * 7] + 4) >> 3;
72  a7 = (W7 * b[8 * 1] - W1 * b[8 * 7] + 4) >> 3;
73  a5 = (W5 * b[8 * 5] + W3 * b[8 * 3] + 4) >> 3;
74  a3 = (W3 * b[8 * 5] - W5 * b[8 * 3] + 4) >> 3;
75  a2 = (W2 * b[8 * 2] + W6 * b[8 * 6] + 4) >> 3;
76  a6 = (W6 * b[8 * 2] - W2 * b[8 * 6] + 4) >> 3;
77  a0 = (W0 * b[8 * 0] + W0 * b[8 * 4] ) >> 3;
78  a4 = (W0 * b[8 * 0] - W0 * b[8 * 4] ) >> 3;
79 
80  /* step 2 */
81  s1 = (181 * (a1 - a5 + a7 - a3) + 128) >> 8;
82  s2 = (181 * (a1 - a5 - a7 + a3) + 128) >> 8;
83 
84  /* step 3 */
85  b[8 * 0] = (a0 + a2 + a1 + a5 + (1 << 13)) >> 14;
86  b[8 * 1] = (a4 + a6 + s1 + (1 << 13)) >> 14;
87  b[8 * 2] = (a4 - a6 + s2 + (1 << 13)) >> 14;
88  b[8 * 3] = (a0 - a2 + a7 + a3 + (1 << 13)) >> 14;
89 
90  b[8 * 4] = (a0 - a2 - a7 - a3 + (1 << 13)) >> 14;
91  b[8 * 5] = (a4 - a6 - s2 + (1 << 13)) >> 14;
92  b[8 * 6] = (a4 + a6 - s1 + (1 << 13)) >> 14;
93  b[8 * 7] = (a0 + a2 - a1 - a5 + (1 << 13)) >> 14;
94 }
95 
96 static void wmv2_idct_add_c(uint8_t *dest, int line_size, int16_t *block)
97 {
98  int i;
99 
100  for (i = 0; i < 64; i += 8)
101  wmv2_idct_row(block + i);
102  for (i = 0; i < 8; i++)
103  wmv2_idct_col(block + i);
104 
105  for (i = 0; i < 8; i++) {
106  dest[0] = av_clip_uint8(dest[0] + block[0]);
107  dest[1] = av_clip_uint8(dest[1] + block[1]);
108  dest[2] = av_clip_uint8(dest[2] + block[2]);
109  dest[3] = av_clip_uint8(dest[3] + block[3]);
110  dest[4] = av_clip_uint8(dest[4] + block[4]);
111  dest[5] = av_clip_uint8(dest[5] + block[5]);
112  dest[6] = av_clip_uint8(dest[6] + block[6]);
113  dest[7] = av_clip_uint8(dest[7] + block[7]);
114  dest += line_size;
115  block += 8;
116  }
117 }
118 
119 static void wmv2_idct_put_c(uint8_t *dest, int line_size, int16_t *block)
120 {
121  int i;
122 
123  for (i = 0; i < 64; i += 8)
124  wmv2_idct_row(block + i);
125  for (i = 0; i < 8; i++)
126  wmv2_idct_col(block + i);
127 
128  for (i = 0; i < 8; i++) {
129  dest[0] = av_clip_uint8(block[0]);
130  dest[1] = av_clip_uint8(block[1]);
131  dest[2] = av_clip_uint8(block[2]);
132  dest[3] = av_clip_uint8(block[3]);
133  dest[4] = av_clip_uint8(block[4]);
134  dest[5] = av_clip_uint8(block[5]);
135  dest[6] = av_clip_uint8(block[6]);
136  dest[7] = av_clip_uint8(block[7]);
137  dest += line_size;
138  block += 8;
139  }
140 }
141 
142 static void wmv2_mspel8_h_lowpass(uint8_t *dst, const uint8_t *src,
143  int dstStride, int srcStride, int h)
144 {
145  const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
146  int i;
147 
148  for (i = 0; i < h; i++) {
149  dst[0] = cm[(9 * (src[0] + src[1]) - (src[-1] + src[2]) + 8) >> 4];
150  dst[1] = cm[(9 * (src[1] + src[2]) - (src[0] + src[3]) + 8) >> 4];
151  dst[2] = cm[(9 * (src[2] + src[3]) - (src[1] + src[4]) + 8) >> 4];
152  dst[3] = cm[(9 * (src[3] + src[4]) - (src[2] + src[5]) + 8) >> 4];
153  dst[4] = cm[(9 * (src[4] + src[5]) - (src[3] + src[6]) + 8) >> 4];
154  dst[5] = cm[(9 * (src[5] + src[6]) - (src[4] + src[7]) + 8) >> 4];
155  dst[6] = cm[(9 * (src[6] + src[7]) - (src[5] + src[8]) + 8) >> 4];
156  dst[7] = cm[(9 * (src[7] + src[8]) - (src[6] + src[9]) + 8) >> 4];
157  dst += dstStride;
158  src += srcStride;
159  }
160 }
161 
162 static void wmv2_mspel8_v_lowpass(uint8_t *dst, const uint8_t *src,
163  int dstStride, int srcStride, int w)
164 {
165  const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
166  int i;
167 
168  for (i = 0; i < w; i++) {
169  const int src_1 = src[-srcStride];
170  const int src0 = src[0];
171  const int src1 = src[srcStride];
172  const int src2 = src[2 * srcStride];
173  const int src3 = src[3 * srcStride];
174  const int src4 = src[4 * srcStride];
175  const int src5 = src[5 * srcStride];
176  const int src6 = src[6 * srcStride];
177  const int src7 = src[7 * srcStride];
178  const int src8 = src[8 * srcStride];
179  const int src9 = src[9 * srcStride];
180  dst[0 * dstStride] = cm[(9 * (src0 + src1) - (src_1 + src2) + 8) >> 4];
181  dst[1 * dstStride] = cm[(9 * (src1 + src2) - (src0 + src3) + 8) >> 4];
182  dst[2 * dstStride] = cm[(9 * (src2 + src3) - (src1 + src4) + 8) >> 4];
183  dst[3 * dstStride] = cm[(9 * (src3 + src4) - (src2 + src5) + 8) >> 4];
184  dst[4 * dstStride] = cm[(9 * (src4 + src5) - (src3 + src6) + 8) >> 4];
185  dst[5 * dstStride] = cm[(9 * (src5 + src6) - (src4 + src7) + 8) >> 4];
186  dst[6 * dstStride] = cm[(9 * (src6 + src7) - (src5 + src8) + 8) >> 4];
187  dst[7 * dstStride] = cm[(9 * (src7 + src8) - (src6 + src9) + 8) >> 4];
188  src++;
189  dst++;
190  }
191 }
192 
193 static void put_mspel8_mc10_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
194 {
195  uint8_t half[64];
196 
197  wmv2_mspel8_h_lowpass(half, src, 8, stride, 8);
198  ff_put_pixels8_l2_8(dst, src, half, stride, stride, 8, 8);
199 }
200 
201 static void put_mspel8_mc20_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
202 {
203  wmv2_mspel8_h_lowpass(dst, src, stride, stride, 8);
204 }
205 
206 static void put_mspel8_mc30_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
207 {
208  uint8_t half[64];
209 
210  wmv2_mspel8_h_lowpass(half, src, 8, stride, 8);
211  ff_put_pixels8_l2_8(dst, src + 1, half, stride, stride, 8, 8);
212 }
213 
214 static void put_mspel8_mc02_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
215 {
216  wmv2_mspel8_v_lowpass(dst, src, stride, stride, 8);
217 }
218 
219 static void put_mspel8_mc12_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
220 {
221  uint8_t halfH[88];
222  uint8_t halfV[64];
223  uint8_t halfHV[64];
224 
225  wmv2_mspel8_h_lowpass(halfH, src - stride, 8, stride, 11);
226  wmv2_mspel8_v_lowpass(halfV, src, 8, stride, 8);
227  wmv2_mspel8_v_lowpass(halfHV, halfH + 8, 8, 8, 8);
228  ff_put_pixels8_l2_8(dst, halfV, halfHV, stride, 8, 8, 8);
229 }
230 
231 static void put_mspel8_mc32_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
232 {
233  uint8_t halfH[88];
234  uint8_t halfV[64];
235  uint8_t halfHV[64];
236 
237  wmv2_mspel8_h_lowpass(halfH, src - stride, 8, stride, 11);
238  wmv2_mspel8_v_lowpass(halfV, src + 1, 8, stride, 8);
239  wmv2_mspel8_v_lowpass(halfHV, halfH + 8, 8, 8, 8);
240  ff_put_pixels8_l2_8(dst, halfV, halfHV, stride, 8, 8, 8);
241 }
242 
243 static void put_mspel8_mc22_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
244 {
245  uint8_t halfH[88];
246 
247  wmv2_mspel8_h_lowpass(halfH, src - stride, 8, stride, 11);
248  wmv2_mspel8_v_lowpass(dst, halfH + 8, stride, 8, 8);
249 }
250 
251 av_cold void ff_wmv2dsp_init(WMV2DSPContext *c)
252 {
253  c->idct_add = wmv2_idct_add_c;
254  c->idct_put = wmv2_idct_put_c;
255  c->idct_perm = FF_IDCT_PERM_NONE;
256 
257  c->put_mspel_pixels_tab[0] = ff_put_pixels8x8_c;
258  c->put_mspel_pixels_tab[1] = put_mspel8_mc10_c;
259  c->put_mspel_pixels_tab[2] = put_mspel8_mc20_c;
260  c->put_mspel_pixels_tab[3] = put_mspel8_mc30_c;
261  c->put_mspel_pixels_tab[4] = put_mspel8_mc02_c;
262  c->put_mspel_pixels_tab[5] = put_mspel8_mc12_c;
263  c->put_mspel_pixels_tab[6] = put_mspel8_mc22_c;
264  c->put_mspel_pixels_tab[7] = put_mspel8_mc32_c;
265 }
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