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idctdsp.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 "config.h"
20 #include "libavutil/attributes.h"
21 #include "libavutil/common.h"
22 #include "avcodec.h"
23 #include "dct.h"
24 #include "faanidct.h"
25 #include "idctdsp.h"
26 #include "simple_idct.h"
27 
28 av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st,
29  const uint8_t *src_scantable)
30 {
31  int i, end;
32 
33  st->scantable = src_scantable;
34 
35  for (i = 0; i < 64; i++) {
36  int j = src_scantable[i];
37  st->permutated[i] = permutation[j];
38  }
39 
40  end = -1;
41  for (i = 0; i < 64; i++) {
42  int j = st->permutated[i];
43  if (j > end)
44  end = j;
45  st->raster_end[i] = end;
46  }
47 }
48 
49 av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation,
50  int idct_permutation_type)
51 {
52  int i;
53 
54  if (ARCH_X86)
55  if (ff_init_scantable_permutation_x86(idct_permutation,
56  idct_permutation_type))
57  return;
58 
59  switch (idct_permutation_type) {
60  case FF_NO_IDCT_PERM:
61  for (i = 0; i < 64; i++)
62  idct_permutation[i] = i;
63  break;
64  case FF_LIBMPEG2_IDCT_PERM:
65  for (i = 0; i < 64; i++)
66  idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
67  break;
68  case FF_TRANSPOSE_IDCT_PERM:
69  for (i = 0; i < 64; i++)
70  idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
71  break;
72  case FF_PARTTRANS_IDCT_PERM:
73  for (i = 0; i < 64; i++)
74  idct_permutation[i] = (i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3);
75  break;
76  default:
77  av_log(NULL, AV_LOG_ERROR,
78  "Internal error, IDCT permutation not set\n");
79  }
80 }
81 
82 static void put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
83  int line_size)
84 {
85  int i;
86 
87  /* read the pixels */
88  for (i = 0; i < 8; i++) {
89  pixels[0] = av_clip_uint8(block[0]);
90  pixels[1] = av_clip_uint8(block[1]);
91  pixels[2] = av_clip_uint8(block[2]);
92  pixels[3] = av_clip_uint8(block[3]);
93  pixels[4] = av_clip_uint8(block[4]);
94  pixels[5] = av_clip_uint8(block[5]);
95  pixels[6] = av_clip_uint8(block[6]);
96  pixels[7] = av_clip_uint8(block[7]);
97 
98  pixels += line_size;
99  block += 8;
100  }
101 }
102 
103 static void put_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
104  int line_size)
105 {
106  int i;
107 
108  /* read the pixels */
109  for(i=0;i<4;i++) {
110  pixels[0] = av_clip_uint8(block[0]);
111  pixels[1] = av_clip_uint8(block[1]);
112  pixels[2] = av_clip_uint8(block[2]);
113  pixels[3] = av_clip_uint8(block[3]);
114 
115  pixels += line_size;
116  block += 8;
117  }
118 }
119 
120 static void put_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
121  int line_size)
122 {
123  int i;
124 
125  /* read the pixels */
126  for(i=0;i<2;i++) {
127  pixels[0] = av_clip_uint8(block[0]);
128  pixels[1] = av_clip_uint8(block[1]);
129 
130  pixels += line_size;
131  block += 8;
132  }
133 }
134 
135 static void put_signed_pixels_clamped_c(const int16_t *block,
136  uint8_t *av_restrict pixels,
137  int line_size)
138 {
139  int i, j;
140 
141  for (i = 0; i < 8; i++) {
142  for (j = 0; j < 8; j++) {
143  if (*block < -128)
144  *pixels = 0;
145  else if (*block > 127)
146  *pixels = 255;
147  else
148  *pixels = (uint8_t) (*block + 128);
149  block++;
150  pixels++;
151  }
152  pixels += (line_size - 8);
153  }
154 }
155 
156 static void add_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
157  int line_size)
158 {
159  int i;
160 
161  /* read the pixels */
162  for (i = 0; i < 8; i++) {
163  pixels[0] = av_clip_uint8(pixels[0] + block[0]);
164  pixels[1] = av_clip_uint8(pixels[1] + block[1]);
165  pixels[2] = av_clip_uint8(pixels[2] + block[2]);
166  pixels[3] = av_clip_uint8(pixels[3] + block[3]);
167  pixels[4] = av_clip_uint8(pixels[4] + block[4]);
168  pixels[5] = av_clip_uint8(pixels[5] + block[5]);
169  pixels[6] = av_clip_uint8(pixels[6] + block[6]);
170  pixels[7] = av_clip_uint8(pixels[7] + block[7]);
171  pixels += line_size;
172  block += 8;
173  }
174 }
175 
176 static void add_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
177  int line_size)
178 {
179  int i;
180 
181  /* read the pixels */
182  for(i=0;i<4;i++) {
183  pixels[0] = av_clip_uint8(pixels[0] + block[0]);
184  pixels[1] = av_clip_uint8(pixels[1] + block[1]);
185  pixels[2] = av_clip_uint8(pixels[2] + block[2]);
186  pixels[3] = av_clip_uint8(pixels[3] + block[3]);
187  pixels += line_size;
188  block += 8;
189  }
190 }
191 
192 static void add_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
193  int line_size)
194 {
195  int i;
196 
197  /* read the pixels */
198  for(i=0;i<2;i++) {
199  pixels[0] = av_clip_uint8(pixels[0] + block[0]);
200  pixels[1] = av_clip_uint8(pixels[1] + block[1]);
201  pixels += line_size;
202  block += 8;
203  }
204 }
205 
206 static void jref_idct_put(uint8_t *dest, int line_size, int16_t *block)
207 {
208  ff_j_rev_dct(block);
209  put_pixels_clamped_c(block, dest, line_size);
210 }
211 
212 static void jref_idct_add(uint8_t *dest, int line_size, int16_t *block)
213 {
214  ff_j_rev_dct(block);
215  add_pixels_clamped_c(block, dest, line_size);
216 }
217 static void ff_jref_idct4_put(uint8_t *dest, int line_size, int16_t *block)
218 {
219  ff_j_rev_dct4 (block);
220  put_pixels_clamped4_c(block, dest, line_size);
221 }
222 static void ff_jref_idct4_add(uint8_t *dest, int line_size, int16_t *block)
223 {
224  ff_j_rev_dct4 (block);
225  add_pixels_clamped4_c(block, dest, line_size);
226 }
227 
228 static void ff_jref_idct2_put(uint8_t *dest, int line_size, int16_t *block)
229 {
230  ff_j_rev_dct2 (block);
231  put_pixels_clamped2_c(block, dest, line_size);
232 }
233 static void ff_jref_idct2_add(uint8_t *dest, int line_size, int16_t *block)
234 {
235  ff_j_rev_dct2 (block);
236  add_pixels_clamped2_c(block, dest, line_size);
237 }
238 
239 static void ff_jref_idct1_put(uint8_t *dest, int line_size, int16_t *block)
240 {
241  dest[0] = av_clip_uint8((block[0] + 4)>>3);
242 }
243 static void ff_jref_idct1_add(uint8_t *dest, int line_size, int16_t *block)
244 {
245  dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
246 }
247 
248 av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
249 {
250  const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
251 
252  if (avctx->lowres==1) {
253  c->idct_put = ff_jref_idct4_put;
254  c->idct_add = ff_jref_idct4_add;
255  c->idct = ff_j_rev_dct4;
256  c->idct_permutation_type = FF_NO_IDCT_PERM;
257  } else if (avctx->lowres==2) {
258  c->idct_put = ff_jref_idct2_put;
259  c->idct_add = ff_jref_idct2_add;
260  c->idct = ff_j_rev_dct2;
261  c->idct_permutation_type = FF_NO_IDCT_PERM;
262  } else if (avctx->lowres==3) {
263  c->idct_put = ff_jref_idct1_put;
264  c->idct_add = ff_jref_idct1_add;
265  c->idct = ff_j_rev_dct1;
266  c->idct_permutation_type = FF_NO_IDCT_PERM;
267  } else {
268  if (avctx->bits_per_raw_sample == 10) {
269  c->idct_put = ff_simple_idct_put_10;
270  c->idct_add = ff_simple_idct_add_10;
271  c->idct = ff_simple_idct_10;
272  c->idct_permutation_type = FF_NO_IDCT_PERM;
273  } else if (avctx->bits_per_raw_sample == 12) {
274  c->idct_put = ff_simple_idct_put_12;
275  c->idct_add = ff_simple_idct_add_12;
276  c->idct = ff_simple_idct_12;
277  c->idct_permutation_type = FF_NO_IDCT_PERM;
278  } else {
279  if (avctx->idct_algo == FF_IDCT_INT) {
280  c->idct_put = jref_idct_put;
281  c->idct_add = jref_idct_add;
282  c->idct = ff_j_rev_dct;
283  c->idct_permutation_type = FF_LIBMPEG2_IDCT_PERM;
284  } else if (avctx->idct_algo == FF_IDCT_FAAN) {
285  c->idct_put = ff_faanidct_put;
286  c->idct_add = ff_faanidct_add;
287  c->idct = ff_faanidct;
288  c->idct_permutation_type = FF_NO_IDCT_PERM;
289  } else { // accurate/default
290  c->idct_put = ff_simple_idct_put_8;
291  c->idct_add = ff_simple_idct_add_8;
292  c->idct = ff_simple_idct_8;
293  c->idct_permutation_type = FF_NO_IDCT_PERM;
294  }
295  }
296  }
297 
298  c->put_pixels_clamped = put_pixels_clamped_c;
299  c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
300  c->add_pixels_clamped = add_pixels_clamped_c;
301 
302  if (ARCH_ALPHA)
303  ff_idctdsp_init_alpha(c, avctx, high_bit_depth);
304  if (ARCH_ARM)
305  ff_idctdsp_init_arm(c, avctx, high_bit_depth);
306  if (ARCH_PPC)
307  ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
308  if (ARCH_X86)
309  ff_idctdsp_init_x86(c, avctx, high_bit_depth);
310 
311  ff_init_scantable_permutation(c->idct_permutation,
312  c->idct_permutation_type);
313 }
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