aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/vp3dsp.c
blob: ec859a679d0beffd9fd3d917140c7c28e97042ff (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
/*
 * Copyright (C) 2004 The FFmpeg project
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Standard C DSP-oriented functions cribbed from the original VP3
 * source code.
 */

#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avassert.h"

#include "avcodec.h"
#include "rnd_avg.h"
#include "vp3dsp.h"

#define IdctAdjustBeforeShift 8
#define xC1S7 64277
#define xC2S6 60547
#define xC3S5 54491
#define xC4S4 46341
#define xC5S3 36410
#define xC6S2 25080
#define xC7S1 12785

#define M(a, b) ((int)((SUINT)(a) * (b)) >> 16)

static av_always_inline void idct(uint8_t *dst, ptrdiff_t stride,
                                  int16_t *input, int type)
{
    int16_t *ip = input;

    int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;
    int Ed, Gd, Add, Bdd, Fd, Hd;

    int i;

    /* Inverse DCT on the rows now */
    for (i = 0; i < 8; i++) {
        /* Check for non-zero values */
        if (ip[0 * 8] | ip[1 * 8] | ip[2 * 8] | ip[3 * 8] |
            ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8]) {
            A = M(xC1S7, ip[1 * 8]) + M(xC7S1, ip[7 * 8]);
            B = M(xC7S1, ip[1 * 8]) - M(xC1S7, ip[7 * 8]);
            C = M(xC3S5, ip[3 * 8]) + M(xC5S3, ip[5 * 8]);
            D = M(xC3S5, ip[5 * 8]) - M(xC5S3, ip[3 * 8]);

            Ad = M(xC4S4, (A - C));
            Bd = M(xC4S4, (B - D));

            Cd = A + C;
            Dd = B + D;

            E = M(xC4S4, (ip[0 * 8] + ip[4 * 8]));
            F = M(xC4S4, (ip[0 * 8] - ip[4 * 8]));

            G = M(xC2S6, ip[2 * 8]) + M(xC6S2, ip[6 * 8]);
            H = M(xC6S2, ip[2 * 8]) - M(xC2S6, ip[6 * 8]);

            Ed = E - G;
            Gd = E + G;

            Add = F + Ad;
            Bdd = Bd - H;

            Fd = F - Ad;
            Hd = Bd + H;

            /*  Final sequence of operations over-write original inputs. */
            ip[0 * 8] = Gd + Cd;
            ip[7 * 8] = Gd - Cd;

            ip[1 * 8] = Add + Hd;
            ip[2 * 8] = Add - Hd;

            ip[3 * 8] = Ed + Dd;
            ip[4 * 8] = Ed - Dd;

            ip[5 * 8] = Fd + Bdd;
            ip[6 * 8] = Fd - Bdd;
        }

        ip += 1;            /* next row */
    }

    ip = input;

    for (i = 0; i < 8; i++) {
        /* Check for non-zero values (bitwise or faster than ||) */
        if (ip[1] | ip[2] | ip[3] |
            ip[4] | ip[5] | ip[6] | ip[7]) {
            A = M(xC1S7, ip[1]) + M(xC7S1, ip[7]);
            B = M(xC7S1, ip[1]) - M(xC1S7, ip[7]);
            C = M(xC3S5, ip[3]) + M(xC5S3, ip[5]);
            D = M(xC3S5, ip[5]) - M(xC5S3, ip[3]);

            Ad = M(xC4S4, (A - C));
            Bd = M(xC4S4, (B - D));

            Cd = A + C;
            Dd = B + D;

            E = M(xC4S4, (ip[0] + ip[4])) + 8;
            F = M(xC4S4, (ip[0] - ip[4])) + 8;

            if (type == 1) { // HACK
                E += 16 * 128;
                F += 16 * 128;
            }

            G = M(xC2S6, ip[2]) + M(xC6S2, ip[6]);
            H = M(xC6S2, ip[2]) - M(xC2S6, ip[6]);

            Ed = E - G;
            Gd = E + G;

            Add = F + Ad;
            Bdd = Bd - H;

            Fd = F - Ad;
            Hd = Bd + H;

            /* Final sequence of operations over-write original inputs. */
            if (type == 1) {
                dst[0 * stride] = av_clip_uint8((Gd + Cd) >> 4);
                dst[7 * stride] = av_clip_uint8((Gd - Cd) >> 4);

                dst[1 * stride] = av_clip_uint8((Add + Hd) >> 4);
                dst[2 * stride] = av_clip_uint8((Add - Hd) >> 4);

                dst[3 * stride] = av_clip_uint8((Ed + Dd) >> 4);
                dst[4 * stride] = av_clip_uint8((Ed - Dd) >> 4);

                dst[5 * stride] = av_clip_uint8((Fd + Bdd) >> 4);
                dst[6 * stride] = av_clip_uint8((Fd - Bdd) >> 4);
            } else {
                dst[0 * stride] = av_clip_uint8(dst[0 * stride] + ((Gd + Cd) >> 4));
                dst[7 * stride] = av_clip_uint8(dst[7 * stride] + ((Gd - Cd) >> 4));

                dst[1 * stride] = av_clip_uint8(dst[1 * stride] + ((Add + Hd) >> 4));
                dst[2 * stride] = av_clip_uint8(dst[2 * stride] + ((Add - Hd) >> 4));

                dst[3 * stride] = av_clip_uint8(dst[3 * stride] + ((Ed + Dd) >> 4));
                dst[4 * stride] = av_clip_uint8(dst[4 * stride] + ((Ed - Dd) >> 4));

                dst[5 * stride] = av_clip_uint8(dst[5 * stride] + ((Fd + Bdd) >> 4));
                dst[6 * stride] = av_clip_uint8(dst[6 * stride] + ((Fd - Bdd) >> 4));
            }
        } else {
            if (type == 1) {
                dst[0*stride] =
                dst[1*stride] =
                dst[2*stride] =
                dst[3*stride] =
                dst[4*stride] =
                dst[5*stride] =
                dst[6*stride] =
                dst[7*stride] = av_clip_uint8(128 + ((xC4S4 * ip[0] + (IdctAdjustBeforeShift << 16)) >> 20));
            } else {
                if (ip[0]) {
                    int v = (xC4S4 * ip[0] + (IdctAdjustBeforeShift << 16)) >> 20;
                    dst[0 * stride] = av_clip_uint8(dst[0 * stride] + v);
                    dst[1 * stride] = av_clip_uint8(dst[1 * stride] + v);
                    dst[2 * stride] = av_clip_uint8(dst[2 * stride] + v);
                    dst[3 * stride] = av_clip_uint8(dst[3 * stride] + v);
                    dst[4 * stride] = av_clip_uint8(dst[4 * stride] + v);
                    dst[5 * stride] = av_clip_uint8(dst[5 * stride] + v);
                    dst[6 * stride] = av_clip_uint8(dst[6 * stride] + v);
                    dst[7 * stride] = av_clip_uint8(dst[7 * stride] + v);
                }
            }
        }

        ip += 8;            /* next column */
        dst++;
    }
}

static av_always_inline void idct10(uint8_t *dst, ptrdiff_t stride,
                                    int16_t *input, int type)
{
    int16_t *ip = input;

    int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;
    int Ed, Gd, Add, Bdd, Fd, Hd;

    int i;

    /* Inverse DCT on the rows now */
    for (i = 0; i < 4; i++) {
        /* Check for non-zero values */
        if (ip[0 * 8] | ip[1 * 8] | ip[2 * 8] | ip[3 * 8]) {
            A =  M(xC1S7, ip[1 * 8]);
            B =  M(xC7S1, ip[1 * 8]);
            C =  M(xC3S5, ip[3 * 8]);
            D = -M(xC5S3, ip[3 * 8]);

            Ad = M(xC4S4, (A - C));
            Bd = M(xC4S4, (B - D));

            Cd = A + C;
            Dd = B + D;

            E = M(xC4S4, ip[0 * 8]);
            F = E;

            G = M(xC2S6, ip[2 * 8]);
            H = M(xC6S2, ip[2 * 8]);

            Ed = E - G;
            Gd = E + G;

            Add = F + Ad;
            Bdd = Bd - H;

            Fd = F - Ad;
            Hd = Bd + H;

            /* Final sequence of operations over-write original inputs */
            ip[0 * 8] = Gd + Cd;
            ip[7 * 8] = Gd - Cd;

            ip[1 * 8] = Add + Hd;
            ip[2 * 8] = Add - Hd;

            ip[3 * 8] = Ed + Dd;
            ip[4 * 8] = Ed - Dd;

            ip[5 * 8] = Fd + Bdd;
            ip[6 * 8] = Fd - Bdd;

        }

        ip += 1;
    }

    ip = input;

    for (i = 0; i < 8; i++) {
        /* Check for non-zero values (bitwise or faster than ||) */
        if (ip[0] | ip[1] | ip[2] | ip[3]) {
            A =  M(xC1S7, ip[1]);
            B =  M(xC7S1, ip[1]);
            C =  M(xC3S5, ip[3]);
            D = -M(xC5S3, ip[3]);

            Ad = M(xC4S4, (A - C));
            Bd = M(xC4S4, (B - D));

            Cd = A + C;
            Dd = B + D;

            E = M(xC4S4, ip[0]);
            if (type == 1)
                E += 16 * 128;
            F = E;

            G = M(xC2S6, ip[2]);
            H = M(xC6S2, ip[2]);

            Ed = E - G;
            Gd = E + G;

            Add = F + Ad;
            Bdd = Bd - H;

            Fd = F - Ad;
            Hd = Bd + H;

            Gd += 8;
            Add += 8;
            Ed += 8;
            Fd += 8;

            /* Final sequence of operations over-write original inputs. */
            if (type == 1) {
                dst[0 * stride] = av_clip_uint8((Gd + Cd) >> 4);
                dst[7 * stride] = av_clip_uint8((Gd - Cd) >> 4);

                dst[1 * stride] = av_clip_uint8((Add + Hd) >> 4);
                dst[2 * stride] = av_clip_uint8((Add - Hd) >> 4);

                dst[3 * stride] = av_clip_uint8((Ed + Dd) >> 4);
                dst[4 * stride] = av_clip_uint8((Ed - Dd) >> 4);

                dst[5 * stride] = av_clip_uint8((Fd + Bdd) >> 4);
                dst[6 * stride] = av_clip_uint8((Fd - Bdd) >> 4);
            } else {
                dst[0 * stride] = av_clip_uint8(dst[0 * stride] + ((Gd + Cd) >> 4));
                dst[7 * stride] = av_clip_uint8(dst[7 * stride] + ((Gd - Cd) >> 4));

                dst[1 * stride] = av_clip_uint8(dst[1 * stride] + ((Add + Hd) >> 4));
                dst[2 * stride] = av_clip_uint8(dst[2 * stride] + ((Add - Hd) >> 4));

                dst[3 * stride] = av_clip_uint8(dst[3 * stride] + ((Ed + Dd) >> 4));
                dst[4 * stride] = av_clip_uint8(dst[4 * stride] + ((Ed - Dd) >> 4));

                dst[5 * stride] = av_clip_uint8(dst[5 * stride] + ((Fd + Bdd) >> 4));
                dst[6 * stride] = av_clip_uint8(dst[6 * stride] + ((Fd - Bdd) >> 4));
            }
        } else {
            if (type == 1) {
                dst[0*stride] =
                dst[1*stride] =
                dst[2*stride] =
                dst[3*stride] =
                dst[4*stride] =
                dst[5*stride] =
                dst[6*stride] =
                dst[7*stride] = 128;
            }
        }

        ip += 8;
        dst++;
    }
}

void ff_vp3dsp_idct10_put(uint8_t *dest, ptrdiff_t stride, int16_t *block)
{
    idct10(dest, stride, block, 1);
    memset(block, 0, sizeof(*block) * 64);
}

void ff_vp3dsp_idct10_add(uint8_t *dest, ptrdiff_t stride, int16_t *block)
{
    idct10(dest, stride, block, 2);
    memset(block, 0, sizeof(*block) * 64);
}

static void vp3_idct_put_c(uint8_t *dest /* align 8 */, ptrdiff_t stride,
                           int16_t *block /* align 16 */)
{
    idct(dest, stride, block, 1);
    memset(block, 0, sizeof(*block) * 64);
}

static void vp3_idct_add_c(uint8_t *dest /* align 8 */, ptrdiff_t stride,
                           int16_t *block /* align 16 */)
{
    idct(dest, stride, block, 2);
    memset(block, 0, sizeof(*block) * 64);
}

static void vp3_idct_dc_add_c(uint8_t *dest /* align 8 */, ptrdiff_t stride,
                              int16_t *block /* align 16 */)
{
    int i, dc = (block[0] + 15) >> 5;

    for (i = 0; i < 8; i++) {
        dest[0] = av_clip_uint8(dest[0] + dc);
        dest[1] = av_clip_uint8(dest[1] + dc);
        dest[2] = av_clip_uint8(dest[2] + dc);
        dest[3] = av_clip_uint8(dest[3] + dc);
        dest[4] = av_clip_uint8(dest[4] + dc);
        dest[5] = av_clip_uint8(dest[5] + dc);
        dest[6] = av_clip_uint8(dest[6] + dc);
        dest[7] = av_clip_uint8(dest[7] + dc);
        dest   += stride;
    }
    block[0] = 0;
}

static av_always_inline void vp3_v_loop_filter_c(uint8_t *first_pixel, ptrdiff_t stride,
                                                 int *bounding_values, int count)
{
    unsigned char *end;
    int filter_value;
    const ptrdiff_t nstride = -stride;

    for (end = first_pixel + count; first_pixel < end; first_pixel++) {
        filter_value = (first_pixel[2 * nstride] - first_pixel[stride]) +
                       (first_pixel[0] - first_pixel[nstride]) * 3;
        filter_value = bounding_values[(filter_value + 4) >> 3];

        first_pixel[nstride] = av_clip_uint8(first_pixel[nstride] + filter_value);
        first_pixel[0]       = av_clip_uint8(first_pixel[0] - filter_value);
    }
}

static av_always_inline void vp3_h_loop_filter_c(uint8_t *first_pixel, ptrdiff_t stride,
                                                 int *bounding_values, int count)
{
    unsigned char *end;
    int filter_value;

    for (end = first_pixel + count * stride; first_pixel != end; first_pixel += stride) {
        filter_value = (first_pixel[-2] - first_pixel[1]) +
                       (first_pixel[ 0] - first_pixel[-1]) * 3;
        filter_value = bounding_values[(filter_value + 4) >> 3];

        first_pixel[-1] = av_clip_uint8(first_pixel[-1] + filter_value);
        first_pixel[ 0] = av_clip_uint8(first_pixel[ 0] - filter_value);
    }
}

#define LOOP_FILTER(prefix, suffix, dim, count) \
void prefix##_##dim##_loop_filter_##count##suffix(uint8_t *first_pixel, ptrdiff_t stride, \
                                int *bounding_values) \
{ \
    vp3_##dim##_loop_filter_c(first_pixel, stride, bounding_values, count); \
}

static LOOP_FILTER(vp3,_c, v, 8)
static LOOP_FILTER(vp3,_c, h, 8)
LOOP_FILTER(ff_vp3dsp, , v, 12)
LOOP_FILTER(ff_vp3dsp, , h, 12)

static void put_no_rnd_pixels_l2(uint8_t *dst, const uint8_t *src1,
                                 const uint8_t *src2, ptrdiff_t stride, int h)
{
    int i;

    for (i = 0; i < h; i++) {
        uint32_t a, b;

        a = AV_RN32(&src1[i * stride]);
        b = AV_RN32(&src2[i * stride]);
        AV_WN32A(&dst[i * stride], no_rnd_avg32(a, b));
        a = AV_RN32(&src1[i * stride + 4]);
        b = AV_RN32(&src2[i * stride + 4]);
        AV_WN32A(&dst[i * stride + 4], no_rnd_avg32(a, b));
    }
}

av_cold void ff_vp3dsp_init(VP3DSPContext *c, int flags)
{
    c->put_no_rnd_pixels_l2 = put_no_rnd_pixels_l2;

    c->idct_put      = vp3_idct_put_c;
    c->idct_add      = vp3_idct_add_c;
    c->idct_dc_add   = vp3_idct_dc_add_c;
    c->v_loop_filter = c->v_loop_filter_unaligned = vp3_v_loop_filter_8_c;
    c->h_loop_filter = c->h_loop_filter_unaligned = vp3_h_loop_filter_8_c;

    if (ARCH_ARM)
        ff_vp3dsp_init_arm(c, flags);
    if (ARCH_PPC)
        ff_vp3dsp_init_ppc(c, flags);
    if (ARCH_X86)
        ff_vp3dsp_init_x86(c, flags);
    if (ARCH_MIPS)
        ff_vp3dsp_init_mips(c, flags);
}

/*
 * This function initializes the loop filter boundary limits if the frame's
 * quality index is different from the previous frame's.
 *
 * where sizeof(bounding_values_array) is 256 * sizeof(int)
 *
 * The filter_limit_values may not be larger than 127.
 */
void ff_vp3dsp_set_bounding_values(int * bounding_values_array, int filter_limit)
{
    int *bounding_values = bounding_values_array + 127;
    int x;
    int value;

    av_assert0(filter_limit < 128U);

    /* set up the bounding values */
    memset(bounding_values_array, 0, 256 * sizeof(int));
    for (x = 0; x < filter_limit; x++) {
        bounding_values[-x] = -x;
        bounding_values[x] = x;
    }
    for (x = value = filter_limit; x < 128 && value; x++, value--) {
        bounding_values[ x] =  value;
        bounding_values[-x] = -value;
    }
    if (value)
        bounding_values[128] = value;
    bounding_values[129] = bounding_values[130] = filter_limit * 0x02020202U;
}