1 /*
2 * Copyright (c) 2015 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <assert.h>
12 #include "./vpx_dsp_rtcd.h"
13 #include "vpx_dsp/fwd_txfm.h"
14
vpx_fdct4x4_c(const int16_t * input,tran_low_t * output,int stride)15 void vpx_fdct4x4_c(const int16_t *input, tran_low_t *output, int stride) {
16 // The 2D transform is done with two passes which are actually pretty
17 // similar. In the first one, we transform the columns and transpose
18 // the results. In the second one, we transform the rows. To achieve that,
19 // as the first pass results are transposed, we transpose the columns (that
20 // is the transposed rows) and transpose the results (so that it goes back
21 // in normal/row positions).
22 int pass;
23 // We need an intermediate buffer between passes.
24 tran_low_t intermediate[4 * 4];
25 const tran_low_t *in_low = NULL;
26 tran_low_t *out = intermediate;
27 // Do the two transform/transpose passes
28 for (pass = 0; pass < 2; ++pass) {
29 tran_high_t in_high[4]; // canbe16
30 tran_high_t step[4]; // canbe16
31 tran_high_t temp1, temp2; // needs32
32 int i;
33 for (i = 0; i < 4; ++i) {
34 // Load inputs.
35 if (pass == 0) {
36 in_high[0] = input[0 * stride] * 16;
37 in_high[1] = input[1 * stride] * 16;
38 in_high[2] = input[2 * stride] * 16;
39 in_high[3] = input[3 * stride] * 16;
40 if (i == 0 && in_high[0]) {
41 ++in_high[0];
42 }
43 } else {
44 assert(in_low != NULL);
45 in_high[0] = in_low[0 * 4];
46 in_high[1] = in_low[1 * 4];
47 in_high[2] = in_low[2 * 4];
48 in_high[3] = in_low[3 * 4];
49 ++in_low;
50 }
51 // Transform.
52 step[0] = in_high[0] + in_high[3];
53 step[1] = in_high[1] + in_high[2];
54 step[2] = in_high[1] - in_high[2];
55 step[3] = in_high[0] - in_high[3];
56 temp1 = (step[0] + step[1]) * cospi_16_64;
57 temp2 = (step[0] - step[1]) * cospi_16_64;
58 out[0] = (tran_low_t)fdct_round_shift(temp1);
59 out[2] = (tran_low_t)fdct_round_shift(temp2);
60 temp1 = step[2] * cospi_24_64 + step[3] * cospi_8_64;
61 temp2 = -step[2] * cospi_8_64 + step[3] * cospi_24_64;
62 out[1] = (tran_low_t)fdct_round_shift(temp1);
63 out[3] = (tran_low_t)fdct_round_shift(temp2);
64 // Do next column (which is a transposed row in second/horizontal pass)
65 ++input;
66 out += 4;
67 }
68 // Setup in/out for next pass.
69 in_low = intermediate;
70 out = output;
71 }
72
73 {
74 int i, j;
75 for (i = 0; i < 4; ++i) {
76 for (j = 0; j < 4; ++j) output[j + i * 4] = (output[j + i * 4] + 1) >> 2;
77 }
78 }
79 }
80
vpx_fdct4x4_1_c(const int16_t * input,tran_low_t * output,int stride)81 void vpx_fdct4x4_1_c(const int16_t *input, tran_low_t *output, int stride) {
82 int r, c;
83 tran_low_t sum = 0;
84 for (r = 0; r < 4; ++r)
85 for (c = 0; c < 4; ++c) sum += input[r * stride + c];
86
87 output[0] = sum * 2;
88 }
89
vpx_fdct8x8_c(const int16_t * input,tran_low_t * output,int stride)90 void vpx_fdct8x8_c(const int16_t *input, tran_low_t *output, int stride) {
91 int i, j;
92 tran_low_t intermediate[64];
93 int pass;
94 tran_low_t *out = intermediate;
95 const tran_low_t *in = NULL;
96
97 // Transform columns
98 for (pass = 0; pass < 2; ++pass) {
99 tran_high_t s0, s1, s2, s3, s4, s5, s6, s7; // canbe16
100 tran_high_t t0, t1, t2, t3; // needs32
101 tran_high_t x0, x1, x2, x3; // canbe16
102
103 for (i = 0; i < 8; i++) {
104 // stage 1
105 if (pass == 0) {
106 s0 = (input[0 * stride] + input[7 * stride]) * 4;
107 s1 = (input[1 * stride] + input[6 * stride]) * 4;
108 s2 = (input[2 * stride] + input[5 * stride]) * 4;
109 s3 = (input[3 * stride] + input[4 * stride]) * 4;
110 s4 = (input[3 * stride] - input[4 * stride]) * 4;
111 s5 = (input[2 * stride] - input[5 * stride]) * 4;
112 s6 = (input[1 * stride] - input[6 * stride]) * 4;
113 s7 = (input[0 * stride] - input[7 * stride]) * 4;
114 ++input;
115 } else {
116 s0 = in[0 * 8] + in[7 * 8];
117 s1 = in[1 * 8] + in[6 * 8];
118 s2 = in[2 * 8] + in[5 * 8];
119 s3 = in[3 * 8] + in[4 * 8];
120 s4 = in[3 * 8] - in[4 * 8];
121 s5 = in[2 * 8] - in[5 * 8];
122 s6 = in[1 * 8] - in[6 * 8];
123 s7 = in[0 * 8] - in[7 * 8];
124 ++in;
125 }
126
127 // fdct4(step, step);
128 x0 = s0 + s3;
129 x1 = s1 + s2;
130 x2 = s1 - s2;
131 x3 = s0 - s3;
132 t0 = (x0 + x1) * cospi_16_64;
133 t1 = (x0 - x1) * cospi_16_64;
134 t2 = x2 * cospi_24_64 + x3 * cospi_8_64;
135 t3 = -x2 * cospi_8_64 + x3 * cospi_24_64;
136 out[0] = (tran_low_t)fdct_round_shift(t0);
137 out[2] = (tran_low_t)fdct_round_shift(t2);
138 out[4] = (tran_low_t)fdct_round_shift(t1);
139 out[6] = (tran_low_t)fdct_round_shift(t3);
140
141 // Stage 2
142 t0 = (s6 - s5) * cospi_16_64;
143 t1 = (s6 + s5) * cospi_16_64;
144 t2 = fdct_round_shift(t0);
145 t3 = fdct_round_shift(t1);
146
147 // Stage 3
148 x0 = s4 + t2;
149 x1 = s4 - t2;
150 x2 = s7 - t3;
151 x3 = s7 + t3;
152
153 // Stage 4
154 t0 = x0 * cospi_28_64 + x3 * cospi_4_64;
155 t1 = x1 * cospi_12_64 + x2 * cospi_20_64;
156 t2 = x2 * cospi_12_64 + x1 * -cospi_20_64;
157 t3 = x3 * cospi_28_64 + x0 * -cospi_4_64;
158 out[1] = (tran_low_t)fdct_round_shift(t0);
159 out[3] = (tran_low_t)fdct_round_shift(t2);
160 out[5] = (tran_low_t)fdct_round_shift(t1);
161 out[7] = (tran_low_t)fdct_round_shift(t3);
162 out += 8;
163 }
164 in = intermediate;
165 out = output;
166 }
167
168 // Rows
169 for (i = 0; i < 8; ++i) {
170 for (j = 0; j < 8; ++j) output[j + i * 8] /= 2;
171 }
172 }
173
vpx_fdct8x8_1_c(const int16_t * input,tran_low_t * output,int stride)174 void vpx_fdct8x8_1_c(const int16_t *input, tran_low_t *output, int stride) {
175 int r, c;
176 tran_low_t sum = 0;
177 for (r = 0; r < 8; ++r)
178 for (c = 0; c < 8; ++c) sum += input[r * stride + c];
179
180 output[0] = sum;
181 }
182
vpx_fdct16x16_c(const int16_t * input,tran_low_t * output,int stride)183 void vpx_fdct16x16_c(const int16_t *input, tran_low_t *output, int stride) {
184 // The 2D transform is done with two passes which are actually pretty
185 // similar. In the first one, we transform the columns and transpose
186 // the results. In the second one, we transform the rows. To achieve that,
187 // as the first pass results are transposed, we transpose the columns (that
188 // is the transposed rows) and transpose the results (so that it goes back
189 // in normal/row positions).
190 int pass;
191 // We need an intermediate buffer between passes.
192 tran_low_t intermediate[256];
193 const tran_low_t *in_low = NULL;
194 tran_low_t *out = intermediate;
195 // Do the two transform/transpose passes
196 for (pass = 0; pass < 2; ++pass) {
197 tran_high_t step1[8]; // canbe16
198 tran_high_t step2[8]; // canbe16
199 tran_high_t step3[8]; // canbe16
200 tran_high_t in_high[8]; // canbe16
201 tran_high_t temp1, temp2; // needs32
202 int i;
203 for (i = 0; i < 16; i++) {
204 if (0 == pass) {
205 // Calculate input for the first 8 results.
206 in_high[0] = (input[0 * stride] + input[15 * stride]) * 4;
207 in_high[1] = (input[1 * stride] + input[14 * stride]) * 4;
208 in_high[2] = (input[2 * stride] + input[13 * stride]) * 4;
209 in_high[3] = (input[3 * stride] + input[12 * stride]) * 4;
210 in_high[4] = (input[4 * stride] + input[11 * stride]) * 4;
211 in_high[5] = (input[5 * stride] + input[10 * stride]) * 4;
212 in_high[6] = (input[6 * stride] + input[9 * stride]) * 4;
213 in_high[7] = (input[7 * stride] + input[8 * stride]) * 4;
214 // Calculate input for the next 8 results.
215 step1[0] = (input[7 * stride] - input[8 * stride]) * 4;
216 step1[1] = (input[6 * stride] - input[9 * stride]) * 4;
217 step1[2] = (input[5 * stride] - input[10 * stride]) * 4;
218 step1[3] = (input[4 * stride] - input[11 * stride]) * 4;
219 step1[4] = (input[3 * stride] - input[12 * stride]) * 4;
220 step1[5] = (input[2 * stride] - input[13 * stride]) * 4;
221 step1[6] = (input[1 * stride] - input[14 * stride]) * 4;
222 step1[7] = (input[0 * stride] - input[15 * stride]) * 4;
223 } else {
224 // Calculate input for the first 8 results.
225 assert(in_low != NULL);
226 in_high[0] = ((in_low[0 * 16] + 1) >> 2) + ((in_low[15 * 16] + 1) >> 2);
227 in_high[1] = ((in_low[1 * 16] + 1) >> 2) + ((in_low[14 * 16] + 1) >> 2);
228 in_high[2] = ((in_low[2 * 16] + 1) >> 2) + ((in_low[13 * 16] + 1) >> 2);
229 in_high[3] = ((in_low[3 * 16] + 1) >> 2) + ((in_low[12 * 16] + 1) >> 2);
230 in_high[4] = ((in_low[4 * 16] + 1) >> 2) + ((in_low[11 * 16] + 1) >> 2);
231 in_high[5] = ((in_low[5 * 16] + 1) >> 2) + ((in_low[10 * 16] + 1) >> 2);
232 in_high[6] = ((in_low[6 * 16] + 1) >> 2) + ((in_low[9 * 16] + 1) >> 2);
233 in_high[7] = ((in_low[7 * 16] + 1) >> 2) + ((in_low[8 * 16] + 1) >> 2);
234 // Calculate input for the next 8 results.
235 step1[0] = ((in_low[7 * 16] + 1) >> 2) - ((in_low[8 * 16] + 1) >> 2);
236 step1[1] = ((in_low[6 * 16] + 1) >> 2) - ((in_low[9 * 16] + 1) >> 2);
237 step1[2] = ((in_low[5 * 16] + 1) >> 2) - ((in_low[10 * 16] + 1) >> 2);
238 step1[3] = ((in_low[4 * 16] + 1) >> 2) - ((in_low[11 * 16] + 1) >> 2);
239 step1[4] = ((in_low[3 * 16] + 1) >> 2) - ((in_low[12 * 16] + 1) >> 2);
240 step1[5] = ((in_low[2 * 16] + 1) >> 2) - ((in_low[13 * 16] + 1) >> 2);
241 step1[6] = ((in_low[1 * 16] + 1) >> 2) - ((in_low[14 * 16] + 1) >> 2);
242 step1[7] = ((in_low[0 * 16] + 1) >> 2) - ((in_low[15 * 16] + 1) >> 2);
243 in_low++;
244 }
245 // Work on the first eight values; fdct8(input, even_results);
246 {
247 tran_high_t s0, s1, s2, s3, s4, s5, s6, s7; // canbe16
248 tran_high_t t0, t1, t2, t3; // needs32
249 tran_high_t x0, x1, x2, x3; // canbe16
250
251 // stage 1
252 s0 = in_high[0] + in_high[7];
253 s1 = in_high[1] + in_high[6];
254 s2 = in_high[2] + in_high[5];
255 s3 = in_high[3] + in_high[4];
256 s4 = in_high[3] - in_high[4];
257 s5 = in_high[2] - in_high[5];
258 s6 = in_high[1] - in_high[6];
259 s7 = in_high[0] - in_high[7];
260
261 // fdct4(step, step);
262 x0 = s0 + s3;
263 x1 = s1 + s2;
264 x2 = s1 - s2;
265 x3 = s0 - s3;
266 t0 = (x0 + x1) * cospi_16_64;
267 t1 = (x0 - x1) * cospi_16_64;
268 t2 = x3 * cospi_8_64 + x2 * cospi_24_64;
269 t3 = x3 * cospi_24_64 - x2 * cospi_8_64;
270 out[0] = (tran_low_t)fdct_round_shift(t0);
271 out[4] = (tran_low_t)fdct_round_shift(t2);
272 out[8] = (tran_low_t)fdct_round_shift(t1);
273 out[12] = (tran_low_t)fdct_round_shift(t3);
274
275 // Stage 2
276 t0 = (s6 - s5) * cospi_16_64;
277 t1 = (s6 + s5) * cospi_16_64;
278 t2 = fdct_round_shift(t0);
279 t3 = fdct_round_shift(t1);
280
281 // Stage 3
282 x0 = s4 + t2;
283 x1 = s4 - t2;
284 x2 = s7 - t3;
285 x3 = s7 + t3;
286
287 // Stage 4
288 t0 = x0 * cospi_28_64 + x3 * cospi_4_64;
289 t1 = x1 * cospi_12_64 + x2 * cospi_20_64;
290 t2 = x2 * cospi_12_64 + x1 * -cospi_20_64;
291 t3 = x3 * cospi_28_64 + x0 * -cospi_4_64;
292 out[2] = (tran_low_t)fdct_round_shift(t0);
293 out[6] = (tran_low_t)fdct_round_shift(t2);
294 out[10] = (tran_low_t)fdct_round_shift(t1);
295 out[14] = (tran_low_t)fdct_round_shift(t3);
296 }
297 // Work on the next eight values; step1 -> odd_results
298 {
299 // step 2
300 temp1 = (step1[5] - step1[2]) * cospi_16_64;
301 temp2 = (step1[4] - step1[3]) * cospi_16_64;
302 step2[2] = fdct_round_shift(temp1);
303 step2[3] = fdct_round_shift(temp2);
304 temp1 = (step1[4] + step1[3]) * cospi_16_64;
305 temp2 = (step1[5] + step1[2]) * cospi_16_64;
306 step2[4] = fdct_round_shift(temp1);
307 step2[5] = fdct_round_shift(temp2);
308 // step 3
309 step3[0] = step1[0] + step2[3];
310 step3[1] = step1[1] + step2[2];
311 step3[2] = step1[1] - step2[2];
312 step3[3] = step1[0] - step2[3];
313 step3[4] = step1[7] - step2[4];
314 step3[5] = step1[6] - step2[5];
315 step3[6] = step1[6] + step2[5];
316 step3[7] = step1[7] + step2[4];
317 // step 4
318 temp1 = step3[1] * -cospi_8_64 + step3[6] * cospi_24_64;
319 temp2 = step3[2] * cospi_24_64 + step3[5] * cospi_8_64;
320 step2[1] = fdct_round_shift(temp1);
321 step2[2] = fdct_round_shift(temp2);
322 temp1 = step3[2] * cospi_8_64 - step3[5] * cospi_24_64;
323 temp2 = step3[1] * cospi_24_64 + step3[6] * cospi_8_64;
324 step2[5] = fdct_round_shift(temp1);
325 step2[6] = fdct_round_shift(temp2);
326 // step 5
327 step1[0] = step3[0] + step2[1];
328 step1[1] = step3[0] - step2[1];
329 step1[2] = step3[3] + step2[2];
330 step1[3] = step3[3] - step2[2];
331 step1[4] = step3[4] - step2[5];
332 step1[5] = step3[4] + step2[5];
333 step1[6] = step3[7] - step2[6];
334 step1[7] = step3[7] + step2[6];
335 // step 6
336 temp1 = step1[0] * cospi_30_64 + step1[7] * cospi_2_64;
337 temp2 = step1[1] * cospi_14_64 + step1[6] * cospi_18_64;
338 out[1] = (tran_low_t)fdct_round_shift(temp1);
339 out[9] = (tran_low_t)fdct_round_shift(temp2);
340 temp1 = step1[2] * cospi_22_64 + step1[5] * cospi_10_64;
341 temp2 = step1[3] * cospi_6_64 + step1[4] * cospi_26_64;
342 out[5] = (tran_low_t)fdct_round_shift(temp1);
343 out[13] = (tran_low_t)fdct_round_shift(temp2);
344 temp1 = step1[3] * -cospi_26_64 + step1[4] * cospi_6_64;
345 temp2 = step1[2] * -cospi_10_64 + step1[5] * cospi_22_64;
346 out[3] = (tran_low_t)fdct_round_shift(temp1);
347 out[11] = (tran_low_t)fdct_round_shift(temp2);
348 temp1 = step1[1] * -cospi_18_64 + step1[6] * cospi_14_64;
349 temp2 = step1[0] * -cospi_2_64 + step1[7] * cospi_30_64;
350 out[7] = (tran_low_t)fdct_round_shift(temp1);
351 out[15] = (tran_low_t)fdct_round_shift(temp2);
352 }
353 // Do next column (which is a transposed row in second/horizontal pass)
354 input++;
355 out += 16;
356 }
357 // Setup in/out for next pass.
358 in_low = intermediate;
359 out = output;
360 }
361 }
362
vpx_fdct16x16_1_c(const int16_t * input,tran_low_t * output,int stride)363 void vpx_fdct16x16_1_c(const int16_t *input, tran_low_t *output, int stride) {
364 int r, c;
365 int sum = 0;
366 for (r = 0; r < 16; ++r)
367 for (c = 0; c < 16; ++c) sum += input[r * stride + c];
368
369 output[0] = (tran_low_t)(sum >> 1);
370 }
371
dct_32_round(tran_high_t input)372 static INLINE tran_high_t dct_32_round(tran_high_t input) {
373 tran_high_t rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
374 // TODO(debargha, peter.derivaz): Find new bounds for this assert,
375 // and make the bounds consts.
376 // assert(-131072 <= rv && rv <= 131071);
377 return rv;
378 }
379
half_round_shift(tran_high_t input)380 static INLINE tran_high_t half_round_shift(tran_high_t input) {
381 tran_high_t rv = (input + 1 + (input < 0)) >> 2;
382 return rv;
383 }
384
vpx_fdct32(const tran_high_t * input,tran_high_t * output,int round)385 void vpx_fdct32(const tran_high_t *input, tran_high_t *output, int round) {
386 tran_high_t step[32];
387 // Stage 1
388 step[0] = input[0] + input[(32 - 1)];
389 step[1] = input[1] + input[(32 - 2)];
390 step[2] = input[2] + input[(32 - 3)];
391 step[3] = input[3] + input[(32 - 4)];
392 step[4] = input[4] + input[(32 - 5)];
393 step[5] = input[5] + input[(32 - 6)];
394 step[6] = input[6] + input[(32 - 7)];
395 step[7] = input[7] + input[(32 - 8)];
396 step[8] = input[8] + input[(32 - 9)];
397 step[9] = input[9] + input[(32 - 10)];
398 step[10] = input[10] + input[(32 - 11)];
399 step[11] = input[11] + input[(32 - 12)];
400 step[12] = input[12] + input[(32 - 13)];
401 step[13] = input[13] + input[(32 - 14)];
402 step[14] = input[14] + input[(32 - 15)];
403 step[15] = input[15] + input[(32 - 16)];
404 step[16] = -input[16] + input[(32 - 17)];
405 step[17] = -input[17] + input[(32 - 18)];
406 step[18] = -input[18] + input[(32 - 19)];
407 step[19] = -input[19] + input[(32 - 20)];
408 step[20] = -input[20] + input[(32 - 21)];
409 step[21] = -input[21] + input[(32 - 22)];
410 step[22] = -input[22] + input[(32 - 23)];
411 step[23] = -input[23] + input[(32 - 24)];
412 step[24] = -input[24] + input[(32 - 25)];
413 step[25] = -input[25] + input[(32 - 26)];
414 step[26] = -input[26] + input[(32 - 27)];
415 step[27] = -input[27] + input[(32 - 28)];
416 step[28] = -input[28] + input[(32 - 29)];
417 step[29] = -input[29] + input[(32 - 30)];
418 step[30] = -input[30] + input[(32 - 31)];
419 step[31] = -input[31] + input[(32 - 32)];
420
421 // Stage 2
422 output[0] = step[0] + step[16 - 1];
423 output[1] = step[1] + step[16 - 2];
424 output[2] = step[2] + step[16 - 3];
425 output[3] = step[3] + step[16 - 4];
426 output[4] = step[4] + step[16 - 5];
427 output[5] = step[5] + step[16 - 6];
428 output[6] = step[6] + step[16 - 7];
429 output[7] = step[7] + step[16 - 8];
430 output[8] = -step[8] + step[16 - 9];
431 output[9] = -step[9] + step[16 - 10];
432 output[10] = -step[10] + step[16 - 11];
433 output[11] = -step[11] + step[16 - 12];
434 output[12] = -step[12] + step[16 - 13];
435 output[13] = -step[13] + step[16 - 14];
436 output[14] = -step[14] + step[16 - 15];
437 output[15] = -step[15] + step[16 - 16];
438
439 output[16] = step[16];
440 output[17] = step[17];
441 output[18] = step[18];
442 output[19] = step[19];
443
444 output[20] = dct_32_round((-step[20] + step[27]) * cospi_16_64);
445 output[21] = dct_32_round((-step[21] + step[26]) * cospi_16_64);
446 output[22] = dct_32_round((-step[22] + step[25]) * cospi_16_64);
447 output[23] = dct_32_round((-step[23] + step[24]) * cospi_16_64);
448
449 output[24] = dct_32_round((step[24] + step[23]) * cospi_16_64);
450 output[25] = dct_32_round((step[25] + step[22]) * cospi_16_64);
451 output[26] = dct_32_round((step[26] + step[21]) * cospi_16_64);
452 output[27] = dct_32_round((step[27] + step[20]) * cospi_16_64);
453
454 output[28] = step[28];
455 output[29] = step[29];
456 output[30] = step[30];
457 output[31] = step[31];
458
459 // dump the magnitude by 4, hence the intermediate values are within
460 // the range of 16 bits.
461 if (round) {
462 output[0] = half_round_shift(output[0]);
463 output[1] = half_round_shift(output[1]);
464 output[2] = half_round_shift(output[2]);
465 output[3] = half_round_shift(output[3]);
466 output[4] = half_round_shift(output[4]);
467 output[5] = half_round_shift(output[5]);
468 output[6] = half_round_shift(output[6]);
469 output[7] = half_round_shift(output[7]);
470 output[8] = half_round_shift(output[8]);
471 output[9] = half_round_shift(output[9]);
472 output[10] = half_round_shift(output[10]);
473 output[11] = half_round_shift(output[11]);
474 output[12] = half_round_shift(output[12]);
475 output[13] = half_round_shift(output[13]);
476 output[14] = half_round_shift(output[14]);
477 output[15] = half_round_shift(output[15]);
478
479 output[16] = half_round_shift(output[16]);
480 output[17] = half_round_shift(output[17]);
481 output[18] = half_round_shift(output[18]);
482 output[19] = half_round_shift(output[19]);
483 output[20] = half_round_shift(output[20]);
484 output[21] = half_round_shift(output[21]);
485 output[22] = half_round_shift(output[22]);
486 output[23] = half_round_shift(output[23]);
487 output[24] = half_round_shift(output[24]);
488 output[25] = half_round_shift(output[25]);
489 output[26] = half_round_shift(output[26]);
490 output[27] = half_round_shift(output[27]);
491 output[28] = half_round_shift(output[28]);
492 output[29] = half_round_shift(output[29]);
493 output[30] = half_round_shift(output[30]);
494 output[31] = half_round_shift(output[31]);
495 }
496
497 // Stage 3
498 step[0] = output[0] + output[(8 - 1)];
499 step[1] = output[1] + output[(8 - 2)];
500 step[2] = output[2] + output[(8 - 3)];
501 step[3] = output[3] + output[(8 - 4)];
502 step[4] = -output[4] + output[(8 - 5)];
503 step[5] = -output[5] + output[(8 - 6)];
504 step[6] = -output[6] + output[(8 - 7)];
505 step[7] = -output[7] + output[(8 - 8)];
506 step[8] = output[8];
507 step[9] = output[9];
508 step[10] = dct_32_round((-output[10] + output[13]) * cospi_16_64);
509 step[11] = dct_32_round((-output[11] + output[12]) * cospi_16_64);
510 step[12] = dct_32_round((output[12] + output[11]) * cospi_16_64);
511 step[13] = dct_32_round((output[13] + output[10]) * cospi_16_64);
512 step[14] = output[14];
513 step[15] = output[15];
514
515 step[16] = output[16] + output[23];
516 step[17] = output[17] + output[22];
517 step[18] = output[18] + output[21];
518 step[19] = output[19] + output[20];
519 step[20] = -output[20] + output[19];
520 step[21] = -output[21] + output[18];
521 step[22] = -output[22] + output[17];
522 step[23] = -output[23] + output[16];
523 step[24] = -output[24] + output[31];
524 step[25] = -output[25] + output[30];
525 step[26] = -output[26] + output[29];
526 step[27] = -output[27] + output[28];
527 step[28] = output[28] + output[27];
528 step[29] = output[29] + output[26];
529 step[30] = output[30] + output[25];
530 step[31] = output[31] + output[24];
531
532 // Stage 4
533 output[0] = step[0] + step[3];
534 output[1] = step[1] + step[2];
535 output[2] = -step[2] + step[1];
536 output[3] = -step[3] + step[0];
537 output[4] = step[4];
538 output[5] = dct_32_round((-step[5] + step[6]) * cospi_16_64);
539 output[6] = dct_32_round((step[6] + step[5]) * cospi_16_64);
540 output[7] = step[7];
541 output[8] = step[8] + step[11];
542 output[9] = step[9] + step[10];
543 output[10] = -step[10] + step[9];
544 output[11] = -step[11] + step[8];
545 output[12] = -step[12] + step[15];
546 output[13] = -step[13] + step[14];
547 output[14] = step[14] + step[13];
548 output[15] = step[15] + step[12];
549
550 output[16] = step[16];
551 output[17] = step[17];
552 output[18] = dct_32_round(step[18] * -cospi_8_64 + step[29] * cospi_24_64);
553 output[19] = dct_32_round(step[19] * -cospi_8_64 + step[28] * cospi_24_64);
554 output[20] = dct_32_round(step[20] * -cospi_24_64 + step[27] * -cospi_8_64);
555 output[21] = dct_32_round(step[21] * -cospi_24_64 + step[26] * -cospi_8_64);
556 output[22] = step[22];
557 output[23] = step[23];
558 output[24] = step[24];
559 output[25] = step[25];
560 output[26] = dct_32_round(step[26] * cospi_24_64 + step[21] * -cospi_8_64);
561 output[27] = dct_32_round(step[27] * cospi_24_64 + step[20] * -cospi_8_64);
562 output[28] = dct_32_round(step[28] * cospi_8_64 + step[19] * cospi_24_64);
563 output[29] = dct_32_round(step[29] * cospi_8_64 + step[18] * cospi_24_64);
564 output[30] = step[30];
565 output[31] = step[31];
566
567 // Stage 5
568 step[0] = dct_32_round((output[0] + output[1]) * cospi_16_64);
569 step[1] = dct_32_round((-output[1] + output[0]) * cospi_16_64);
570 step[2] = dct_32_round(output[2] * cospi_24_64 + output[3] * cospi_8_64);
571 step[3] = dct_32_round(output[3] * cospi_24_64 - output[2] * cospi_8_64);
572 step[4] = output[4] + output[5];
573 step[5] = -output[5] + output[4];
574 step[6] = -output[6] + output[7];
575 step[7] = output[7] + output[6];
576 step[8] = output[8];
577 step[9] = dct_32_round(output[9] * -cospi_8_64 + output[14] * cospi_24_64);
578 step[10] = dct_32_round(output[10] * -cospi_24_64 + output[13] * -cospi_8_64);
579 step[11] = output[11];
580 step[12] = output[12];
581 step[13] = dct_32_round(output[13] * cospi_24_64 + output[10] * -cospi_8_64);
582 step[14] = dct_32_round(output[14] * cospi_8_64 + output[9] * cospi_24_64);
583 step[15] = output[15];
584
585 step[16] = output[16] + output[19];
586 step[17] = output[17] + output[18];
587 step[18] = -output[18] + output[17];
588 step[19] = -output[19] + output[16];
589 step[20] = -output[20] + output[23];
590 step[21] = -output[21] + output[22];
591 step[22] = output[22] + output[21];
592 step[23] = output[23] + output[20];
593 step[24] = output[24] + output[27];
594 step[25] = output[25] + output[26];
595 step[26] = -output[26] + output[25];
596 step[27] = -output[27] + output[24];
597 step[28] = -output[28] + output[31];
598 step[29] = -output[29] + output[30];
599 step[30] = output[30] + output[29];
600 step[31] = output[31] + output[28];
601
602 // Stage 6
603 output[0] = step[0];
604 output[1] = step[1];
605 output[2] = step[2];
606 output[3] = step[3];
607 output[4] = dct_32_round(step[4] * cospi_28_64 + step[7] * cospi_4_64);
608 output[5] = dct_32_round(step[5] * cospi_12_64 + step[6] * cospi_20_64);
609 output[6] = dct_32_round(step[6] * cospi_12_64 + step[5] * -cospi_20_64);
610 output[7] = dct_32_round(step[7] * cospi_28_64 + step[4] * -cospi_4_64);
611 output[8] = step[8] + step[9];
612 output[9] = -step[9] + step[8];
613 output[10] = -step[10] + step[11];
614 output[11] = step[11] + step[10];
615 output[12] = step[12] + step[13];
616 output[13] = -step[13] + step[12];
617 output[14] = -step[14] + step[15];
618 output[15] = step[15] + step[14];
619
620 output[16] = step[16];
621 output[17] = dct_32_round(step[17] * -cospi_4_64 + step[30] * cospi_28_64);
622 output[18] = dct_32_round(step[18] * -cospi_28_64 + step[29] * -cospi_4_64);
623 output[19] = step[19];
624 output[20] = step[20];
625 output[21] = dct_32_round(step[21] * -cospi_20_64 + step[26] * cospi_12_64);
626 output[22] = dct_32_round(step[22] * -cospi_12_64 + step[25] * -cospi_20_64);
627 output[23] = step[23];
628 output[24] = step[24];
629 output[25] = dct_32_round(step[25] * cospi_12_64 + step[22] * -cospi_20_64);
630 output[26] = dct_32_round(step[26] * cospi_20_64 + step[21] * cospi_12_64);
631 output[27] = step[27];
632 output[28] = step[28];
633 output[29] = dct_32_round(step[29] * cospi_28_64 + step[18] * -cospi_4_64);
634 output[30] = dct_32_round(step[30] * cospi_4_64 + step[17] * cospi_28_64);
635 output[31] = step[31];
636
637 // Stage 7
638 step[0] = output[0];
639 step[1] = output[1];
640 step[2] = output[2];
641 step[3] = output[3];
642 step[4] = output[4];
643 step[5] = output[5];
644 step[6] = output[6];
645 step[7] = output[7];
646 step[8] = dct_32_round(output[8] * cospi_30_64 + output[15] * cospi_2_64);
647 step[9] = dct_32_round(output[9] * cospi_14_64 + output[14] * cospi_18_64);
648 step[10] = dct_32_round(output[10] * cospi_22_64 + output[13] * cospi_10_64);
649 step[11] = dct_32_round(output[11] * cospi_6_64 + output[12] * cospi_26_64);
650 step[12] = dct_32_round(output[12] * cospi_6_64 + output[11] * -cospi_26_64);
651 step[13] = dct_32_round(output[13] * cospi_22_64 + output[10] * -cospi_10_64);
652 step[14] = dct_32_round(output[14] * cospi_14_64 + output[9] * -cospi_18_64);
653 step[15] = dct_32_round(output[15] * cospi_30_64 + output[8] * -cospi_2_64);
654
655 step[16] = output[16] + output[17];
656 step[17] = -output[17] + output[16];
657 step[18] = -output[18] + output[19];
658 step[19] = output[19] + output[18];
659 step[20] = output[20] + output[21];
660 step[21] = -output[21] + output[20];
661 step[22] = -output[22] + output[23];
662 step[23] = output[23] + output[22];
663 step[24] = output[24] + output[25];
664 step[25] = -output[25] + output[24];
665 step[26] = -output[26] + output[27];
666 step[27] = output[27] + output[26];
667 step[28] = output[28] + output[29];
668 step[29] = -output[29] + output[28];
669 step[30] = -output[30] + output[31];
670 step[31] = output[31] + output[30];
671
672 // Final stage --- outputs indices are bit-reversed.
673 output[0] = step[0];
674 output[16] = step[1];
675 output[8] = step[2];
676 output[24] = step[3];
677 output[4] = step[4];
678 output[20] = step[5];
679 output[12] = step[6];
680 output[28] = step[7];
681 output[2] = step[8];
682 output[18] = step[9];
683 output[10] = step[10];
684 output[26] = step[11];
685 output[6] = step[12];
686 output[22] = step[13];
687 output[14] = step[14];
688 output[30] = step[15];
689
690 output[1] = dct_32_round(step[16] * cospi_31_64 + step[31] * cospi_1_64);
691 output[17] = dct_32_round(step[17] * cospi_15_64 + step[30] * cospi_17_64);
692 output[9] = dct_32_round(step[18] * cospi_23_64 + step[29] * cospi_9_64);
693 output[25] = dct_32_round(step[19] * cospi_7_64 + step[28] * cospi_25_64);
694 output[5] = dct_32_round(step[20] * cospi_27_64 + step[27] * cospi_5_64);
695 output[21] = dct_32_round(step[21] * cospi_11_64 + step[26] * cospi_21_64);
696 output[13] = dct_32_round(step[22] * cospi_19_64 + step[25] * cospi_13_64);
697 output[29] = dct_32_round(step[23] * cospi_3_64 + step[24] * cospi_29_64);
698 output[3] = dct_32_round(step[24] * cospi_3_64 + step[23] * -cospi_29_64);
699 output[19] = dct_32_round(step[25] * cospi_19_64 + step[22] * -cospi_13_64);
700 output[11] = dct_32_round(step[26] * cospi_11_64 + step[21] * -cospi_21_64);
701 output[27] = dct_32_round(step[27] * cospi_27_64 + step[20] * -cospi_5_64);
702 output[7] = dct_32_round(step[28] * cospi_7_64 + step[19] * -cospi_25_64);
703 output[23] = dct_32_round(step[29] * cospi_23_64 + step[18] * -cospi_9_64);
704 output[15] = dct_32_round(step[30] * cospi_15_64 + step[17] * -cospi_17_64);
705 output[31] = dct_32_round(step[31] * cospi_31_64 + step[16] * -cospi_1_64);
706 }
707
vpx_fdct32x32_c(const int16_t * input,tran_low_t * output,int stride)708 void vpx_fdct32x32_c(const int16_t *input, tran_low_t *output, int stride) {
709 int i, j;
710 tran_high_t out[32 * 32];
711
712 // Columns
713 for (i = 0; i < 32; ++i) {
714 tran_high_t temp_in[32], temp_out[32];
715 for (j = 0; j < 32; ++j) temp_in[j] = input[j * stride + i] * 4;
716 vpx_fdct32(temp_in, temp_out, 0);
717 for (j = 0; j < 32; ++j)
718 out[j * 32 + i] = (temp_out[j] + 1 + (temp_out[j] > 0)) >> 2;
719 }
720
721 // Rows
722 for (i = 0; i < 32; ++i) {
723 tran_high_t temp_in[32], temp_out[32];
724 for (j = 0; j < 32; ++j) temp_in[j] = out[j + i * 32];
725 vpx_fdct32(temp_in, temp_out, 0);
726 for (j = 0; j < 32; ++j)
727 output[j + i * 32] =
728 (tran_low_t)((temp_out[j] + 1 + (temp_out[j] < 0)) >> 2);
729 }
730 }
731
732 // Note that although we use dct_32_round in dct32 computation flow,
733 // this 2d fdct32x32 for rate-distortion optimization loop is operating
734 // within 16 bits precision.
vpx_fdct32x32_rd_c(const int16_t * input,tran_low_t * output,int stride)735 void vpx_fdct32x32_rd_c(const int16_t *input, tran_low_t *output, int stride) {
736 int i, j;
737 tran_high_t out[32 * 32];
738
739 // Columns
740 for (i = 0; i < 32; ++i) {
741 tran_high_t temp_in[32], temp_out[32];
742 for (j = 0; j < 32; ++j) temp_in[j] = input[j * stride + i] * 4;
743 vpx_fdct32(temp_in, temp_out, 0);
744 for (j = 0; j < 32; ++j)
745 // TODO(cd): see quality impact of only doing
746 // output[j * 32 + i] = (temp_out[j] + 1) >> 2;
747 // PS: also change code in vpx_dsp/x86/vpx_dct_sse2.c
748 out[j * 32 + i] = (temp_out[j] + 1 + (temp_out[j] > 0)) >> 2;
749 }
750
751 // Rows
752 for (i = 0; i < 32; ++i) {
753 tran_high_t temp_in[32], temp_out[32];
754 for (j = 0; j < 32; ++j) temp_in[j] = out[j + i * 32];
755 vpx_fdct32(temp_in, temp_out, 1);
756 for (j = 0; j < 32; ++j) output[j + i * 32] = (tran_low_t)temp_out[j];
757 }
758 }
759
vpx_fdct32x32_1_c(const int16_t * input,tran_low_t * output,int stride)760 void vpx_fdct32x32_1_c(const int16_t *input, tran_low_t *output, int stride) {
761 int r, c;
762 int sum = 0;
763 for (r = 0; r < 32; ++r)
764 for (c = 0; c < 32; ++c) sum += input[r * stride + c];
765
766 output[0] = (tran_low_t)(sum >> 3);
767 }
768
769 #if CONFIG_VP9_HIGHBITDEPTH
vpx_highbd_fdct4x4_c(const int16_t * input,tran_low_t * output,int stride)770 void vpx_highbd_fdct4x4_c(const int16_t *input, tran_low_t *output,
771 int stride) {
772 vpx_fdct4x4_c(input, output, stride);
773 }
774
vpx_highbd_fdct8x8_c(const int16_t * input,tran_low_t * output,int stride)775 void vpx_highbd_fdct8x8_c(const int16_t *input, tran_low_t *output,
776 int stride) {
777 vpx_fdct8x8_c(input, output, stride);
778 }
779
vpx_highbd_fdct8x8_1_c(const int16_t * input,tran_low_t * output,int stride)780 void vpx_highbd_fdct8x8_1_c(const int16_t *input, tran_low_t *output,
781 int stride) {
782 vpx_fdct8x8_1_c(input, output, stride);
783 }
784
vpx_highbd_fdct16x16_c(const int16_t * input,tran_low_t * output,int stride)785 void vpx_highbd_fdct16x16_c(const int16_t *input, tran_low_t *output,
786 int stride) {
787 vpx_fdct16x16_c(input, output, stride);
788 }
789
vpx_highbd_fdct16x16_1_c(const int16_t * input,tran_low_t * output,int stride)790 void vpx_highbd_fdct16x16_1_c(const int16_t *input, tran_low_t *output,
791 int stride) {
792 vpx_fdct16x16_1_c(input, output, stride);
793 }
794
vpx_highbd_fdct32x32_c(const int16_t * input,tran_low_t * output,int stride)795 void vpx_highbd_fdct32x32_c(const int16_t *input, tran_low_t *output,
796 int stride) {
797 vpx_fdct32x32_c(input, output, stride);
798 }
799
vpx_highbd_fdct32x32_rd_c(const int16_t * input,tran_low_t * output,int stride)800 void vpx_highbd_fdct32x32_rd_c(const int16_t *input, tran_low_t *output,
801 int stride) {
802 vpx_fdct32x32_rd_c(input, output, stride);
803 }
804
vpx_highbd_fdct32x32_1_c(const int16_t * input,tran_low_t * output,int stride)805 void vpx_highbd_fdct32x32_1_c(const int16_t *input, tran_low_t *output,
806 int stride) {
807 vpx_fdct32x32_1_c(input, output, stride);
808 }
809 #endif // CONFIG_VP9_HIGHBITDEPTH
810