summaryrefslogtreecommitdiffstats
path: root/libavfilter/vf_lut.c
blob: d005afae874252c5c466ffbd796c95bb30dcd103 (plain)
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
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
/*
 * Copyright (c) 2011 Stefano Sabatini
 *
 * 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
 * Compute a look-up table for binding the input value to the output
 * value, and apply it to input video.
 */

#include "libavutil/attributes.h"
#include "libavutil/bswap.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

static const char *const var_names[] = {
    "w",        ///< width of the input video
    "h",        ///< height of the input video
    "val",      ///< input value for the pixel
    "maxval",   ///< max value for the pixel
    "minval",   ///< min value for the pixel
    "negval",   ///< negated value
    "clipval",
    NULL
};

enum var_name {
    VAR_W,
    VAR_H,
    VAR_VAL,
    VAR_MAXVAL,
    VAR_MINVAL,
    VAR_NEGVAL,
    VAR_CLIPVAL,
    VAR_VARS_NB
};

typedef struct LutContext {
    const AVClass *class;
    uint16_t lut[4][256 * 256];  ///< lookup table for each component
    char   *comp_expr_str[4];
    AVExpr *comp_expr[4];
    int hsub, vsub;
    double var_values[VAR_VARS_NB];
    int is_rgb, is_yuv;
    int is_planar;
    int is_16bit;
    int step;
    int negate_alpha; /* only used by negate */
} LutContext;

#define Y 0
#define U 1
#define V 2
#define R 0
#define G 1
#define B 2
#define A 3

#define OFFSET(x) offsetof(LutContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption options[] = {
    { "c0", "set component #0 expression", OFFSET(comp_expr_str[0]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "c1", "set component #1 expression", OFFSET(comp_expr_str[1]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "c2", "set component #2 expression", OFFSET(comp_expr_str[2]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "c3", "set component #3 expression", OFFSET(comp_expr_str[3]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "y",  "set Y expression",            OFFSET(comp_expr_str[Y]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "u",  "set U expression",            OFFSET(comp_expr_str[U]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "v",  "set V expression",            OFFSET(comp_expr_str[V]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "r",  "set R expression",            OFFSET(comp_expr_str[R]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "g",  "set G expression",            OFFSET(comp_expr_str[G]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "b",  "set B expression",            OFFSET(comp_expr_str[B]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { "a",  "set A expression",            OFFSET(comp_expr_str[A]),  AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
    { NULL }
};

static av_cold void uninit(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;
    int i;

    for (i = 0; i < 4; i++) {
        av_expr_free(s->comp_expr[i]);
        s->comp_expr[i] = NULL;
        av_freep(&s->comp_expr_str[i]);
    }
}

#define YUV_FORMATS                                         \
    AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,    \
    AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUV440P,    \
    AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,   \
    AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,   \
    AV_PIX_FMT_YUVJ440P,                                             \
    AV_PIX_FMT_YUV444P9LE, AV_PIX_FMT_YUV422P9LE, AV_PIX_FMT_YUV420P9LE, \
    AV_PIX_FMT_YUV444P10LE, AV_PIX_FMT_YUV422P10LE, AV_PIX_FMT_YUV420P10LE, AV_PIX_FMT_YUV440P10LE, \
    AV_PIX_FMT_YUV444P12LE, AV_PIX_FMT_YUV422P12LE, AV_PIX_FMT_YUV420P12LE, AV_PIX_FMT_YUV440P12LE, \
    AV_PIX_FMT_YUV444P14LE, AV_PIX_FMT_YUV422P14LE, AV_PIX_FMT_YUV420P14LE, \
    AV_PIX_FMT_YUV444P16LE, AV_PIX_FMT_YUV422P16LE, AV_PIX_FMT_YUV420P16LE, \
    AV_PIX_FMT_YUVA444P16LE, AV_PIX_FMT_YUVA422P16LE, AV_PIX_FMT_YUVA420P16LE

#define RGB_FORMATS                             \
    AV_PIX_FMT_ARGB,         AV_PIX_FMT_RGBA,         \
    AV_PIX_FMT_ABGR,         AV_PIX_FMT_BGRA,         \
    AV_PIX_FMT_RGB24,        AV_PIX_FMT_BGR24,        \
    AV_PIX_FMT_RGB48LE,      AV_PIX_FMT_RGBA64LE,     \
    AV_PIX_FMT_GBRP,         AV_PIX_FMT_GBRAP,        \
    AV_PIX_FMT_GBRP9LE,      AV_PIX_FMT_GBRP10LE,     \
    AV_PIX_FMT_GBRP12LE,     AV_PIX_FMT_GBRP14LE,     \
    AV_PIX_FMT_GBRP16LE,     AV_PIX_FMT_GBRAP12LE,    \
    AV_PIX_FMT_GBRAP16LE

static const enum AVPixelFormat yuv_pix_fmts[] = { YUV_FORMATS, AV_PIX_FMT_NONE };
static const enum AVPixelFormat rgb_pix_fmts[] = { RGB_FORMATS, AV_PIX_FMT_NONE };
static const enum AVPixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, AV_PIX_FMT_NONE };

static int query_formats(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;

    const enum AVPixelFormat *pix_fmts = s->is_rgb ? rgb_pix_fmts :
                                                     s->is_yuv ? yuv_pix_fmts :
                                                                 all_pix_fmts;
    AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
    if (!fmts_list)
        return AVERROR(ENOMEM);
    return ff_set_common_formats(ctx, fmts_list);
}

/**
 * Clip value val in the minval - maxval range.
 */
static double clip(void *opaque, double val)
{
    LutContext *s = opaque;
    double minval = s->var_values[VAR_MINVAL];
    double maxval = s->var_values[VAR_MAXVAL];

    return av_clip(val, minval, maxval);
}

/**
 * Compute gamma correction for value val, assuming the minval-maxval
 * range, val is clipped to a value contained in the same interval.
 */
static double compute_gammaval(void *opaque, double gamma)
{
    LutContext *s = opaque;
    double val    = s->var_values[VAR_CLIPVAL];
    double minval = s->var_values[VAR_MINVAL];
    double maxval = s->var_values[VAR_MAXVAL];

    return pow((val-minval)/(maxval-minval), gamma) * (maxval-minval)+minval;
}

/**
 * Compute ITU Rec.709 gamma correction of value val.
 */
static double compute_gammaval709(void *opaque, double gamma)
{
    LutContext *s = opaque;
    double val    = s->var_values[VAR_CLIPVAL];
    double minval = s->var_values[VAR_MINVAL];
    double maxval = s->var_values[VAR_MAXVAL];
    double level = (val - minval) / (maxval - minval);
    level = level < 0.018 ? 4.5 * level
                          : 1.099 * pow(level, 1.0 / gamma) - 0.099;
    return level * (maxval - minval) + minval;
}

static double (* const funcs1[])(void *, double) = {
    clip,
    compute_gammaval,
    compute_gammaval709,
    NULL
};

static const char * const funcs1_names[] = {
    "clip",
    "gammaval",
    "gammaval709",
    NULL
};

static int config_props(AVFilterLink *inlink)
{
    AVFilterContext *ctx = inlink->dst;
    LutContext *s = ctx->priv;
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
    uint8_t rgba_map[4]; /* component index -> RGBA color index map */
    int min[4], max[4];
    int val, color, ret;

    s->hsub = desc->log2_chroma_w;
    s->vsub = desc->log2_chroma_h;

    s->var_values[VAR_W] = inlink->w;
    s->var_values[VAR_H] = inlink->h;
    s->is_16bit = desc->comp[0].depth > 8;

    switch (inlink->format) {
    case AV_PIX_FMT_YUV410P:
    case AV_PIX_FMT_YUV411P:
    case AV_PIX_FMT_YUV420P:
    case AV_PIX_FMT_YUV422P:
    case AV_PIX_FMT_YUV440P:
    case AV_PIX_FMT_YUV444P:
    case AV_PIX_FMT_YUVA420P:
    case AV_PIX_FMT_YUVA422P:
    case AV_PIX_FMT_YUVA444P:
    case AV_PIX_FMT_YUV420P9LE:
    case AV_PIX_FMT_YUV422P9LE:
    case AV_PIX_FMT_YUV444P9LE:
    case AV_PIX_FMT_YUVA420P9LE:
    case AV_PIX_FMT_YUVA422P9LE:
    case AV_PIX_FMT_YUVA444P9LE:
    case AV_PIX_FMT_YUV420P10LE:
    case AV_PIX_FMT_YUV422P10LE:
    case AV_PIX_FMT_YUV440P10LE:
    case AV_PIX_FMT_YUV444P10LE:
    case AV_PIX_FMT_YUVA420P10LE:
    case AV_PIX_FMT_YUVA422P10LE:
    case AV_PIX_FMT_YUVA444P10LE:
    case AV_PIX_FMT_YUV420P12LE:
    case AV_PIX_FMT_YUV422P12LE:
    case AV_PIX_FMT_YUV440P12LE:
    case AV_PIX_FMT_YUV444P12LE:
    case AV_PIX_FMT_YUV420P14LE:
    case AV_PIX_FMT_YUV422P14LE:
    case AV_PIX_FMT_YUV444P14LE:
    case AV_PIX_FMT_YUV420P16LE:
    case AV_PIX_FMT_YUV422P16LE:
    case AV_PIX_FMT_YUV444P16LE:
    case AV_PIX_FMT_YUVA420P16LE:
    case AV_PIX_FMT_YUVA422P16LE:
    case AV_PIX_FMT_YUVA444P16LE:
        min[Y] = 16 * (1 << (desc->comp[0].depth - 8));
        min[U] = 16 * (1 << (desc->comp[1].depth - 8));
        min[V] = 16 * (1 << (desc->comp[2].depth - 8));
        min[A] = 0;
        max[Y] = 235 * (1 << (desc->comp[0].depth - 8));
        max[U] = 240 * (1 << (desc->comp[1].depth - 8));
        max[V] = 240 * (1 << (desc->comp[2].depth - 8));
        max[A] = (1 << desc->comp[0].depth) - 1;
        break;
    case AV_PIX_FMT_RGB48LE:
    case AV_PIX_FMT_RGBA64LE:
        min[0] = min[1] = min[2] = min[3] = 0;
        max[0] = max[1] = max[2] = max[3] = 65535;
        break;
    default:
        min[0] = min[1] = min[2] = min[3] = 0;
        max[0] = max[1] = max[2] = max[3] = 255 * (1 << (desc->comp[0].depth - 8));
    }

    s->is_yuv = s->is_rgb = 0;
    s->is_planar = desc->flags & AV_PIX_FMT_FLAG_PLANAR;
    if      (ff_fmt_is_in(inlink->format, yuv_pix_fmts)) s->is_yuv = 1;
    else if (ff_fmt_is_in(inlink->format, rgb_pix_fmts)) s->is_rgb = 1;

    if (s->is_rgb) {
        ff_fill_rgba_map(rgba_map, inlink->format);
        s->step = av_get_bits_per_pixel(desc) >> 3;
        if (s->is_16bit) {
            s->step = s->step >> 1;
        }
    }

    for (color = 0; color < desc->nb_components; color++) {
        double res;
        int comp = s->is_rgb ? rgba_map[color] : color;

        /* create the parsed expression */
        av_expr_free(s->comp_expr[color]);
        s->comp_expr[color] = NULL;
        ret = av_expr_parse(&s->comp_expr[color], s->comp_expr_str[color],
                            var_names, funcs1_names, funcs1, NULL, NULL, 0, ctx);
        if (ret < 0) {
            av_log(ctx, AV_LOG_ERROR,
                   "Error when parsing the expression '%s' for the component %d and color %d.\n",
                   s->comp_expr_str[comp], comp, color);
            return AVERROR(EINVAL);
        }

        /* compute the lut */
        s->var_values[VAR_MAXVAL] = max[color];
        s->var_values[VAR_MINVAL] = min[color];

        for (val = 0; val < FF_ARRAY_ELEMS(s->lut[comp]); val++) {
            s->var_values[VAR_VAL] = val;
            s->var_values[VAR_CLIPVAL] = av_clip(val, min[color], max[color]);
            s->var_values[VAR_NEGVAL] =
                av_clip(min[color] + max[color] - s->var_values[VAR_VAL],
                        min[color], max[color]);

            res = av_expr_eval(s->comp_expr[color], s->var_values, s);
            if (isnan(res)) {
                av_log(ctx, AV_LOG_ERROR,
                       "Error when evaluating the expression '%s' for the value %d for the component %d.\n",
                       s->comp_expr_str[color], val, comp);
                return AVERROR(EINVAL);
            }
            s->lut[comp][val] = av_clip((int)res, 0, max[A]);
            av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, s->lut[comp][val]);
        }
    }

    return 0;
}

static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
    AVFilterContext *ctx = inlink->dst;
    LutContext *s = ctx->priv;
    AVFilterLink *outlink = ctx->outputs[0];
    AVFrame *out;
    int i, j, plane, direct = 0;

    if (av_frame_is_writable(in)) {
        direct = 1;
        out = in;
    } else {
        out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
        if (!out) {
            av_frame_free(&in);
            return AVERROR(ENOMEM);
        }
        av_frame_copy_props(out, in);
    }

    if (s->is_rgb && s->is_16bit && !s->is_planar) {
        /* packed, 16-bit */
        uint16_t *inrow, *outrow, *inrow0, *outrow0;
        const int w = inlink->w;
        const int h = in->height;
        const uint16_t (*tab)[256*256] = (const uint16_t (*)[256*256])s->lut;
        const int in_linesize  =  in->linesize[0] / 2;
        const int out_linesize = out->linesize[0] / 2;
        const int step = s->step;

        inrow0  = (uint16_t*) in ->data[0];
        outrow0 = (uint16_t*) out->data[0];

        for (i = 0; i < h; i ++) {
            inrow  = inrow0;
            outrow = outrow0;
            for (j = 0; j < w; j++) {

                switch (step) {
#if HAVE_BIGENDIAN
                case 4:  outrow[3] = av_bswap16(tab[3][av_bswap16(inrow[3])]); // Fall-through
                case 3:  outrow[2] = av_bswap16(tab[2][av_bswap16(inrow[2])]); // Fall-through
                case 2:  outrow[1] = av_bswap16(tab[1][av_bswap16(inrow[1])]); // Fall-through
                default: outrow[0] = av_bswap16(tab[0][av_bswap16(inrow[0])]);
#else
                case 4:  outrow[3] = tab[3][inrow[3]]; // Fall-through
                case 3:  outrow[2] = tab[2][inrow[2]]; // Fall-through
                case 2:  outrow[1] = tab[1][inrow[1]]; // Fall-through
                default: outrow[0] = tab[0][inrow[0]];
#endif
                }
                outrow += step;
                inrow  += step;
            }
            inrow0  += in_linesize;
            outrow0 += out_linesize;
        }
    } else if (s->is_rgb && !s->is_planar) {
        /* packed */
        uint8_t *inrow, *outrow, *inrow0, *outrow0;
        const int w = inlink->w;
        const int h = in->height;
        const uint16_t (*tab)[256*256] = (const uint16_t (*)[256*256])s->lut;
        const int in_linesize  =  in->linesize[0];
        const int out_linesize = out->linesize[0];
        const int step = s->step;

        inrow0  = in ->data[0];
        outrow0 = out->data[0];

        for (i = 0; i < h; i ++) {
            inrow  = inrow0;
            outrow = outrow0;
            for (j = 0; j < w; j++) {
                switch (step) {
                case 4:  outrow[3] = tab[3][inrow[3]]; // Fall-through
                case 3:  outrow[2] = tab[2][inrow[2]]; // Fall-through
                case 2:  outrow[1] = tab[1][inrow[1]]; // Fall-through
                default: outrow[0] = tab[0][inrow[0]];
                }
                outrow += step;
                inrow  += step;
            }
            inrow0  += in_linesize;
            outrow0 += out_linesize;
        }
    } else if (s->is_16bit) {
        // planar >8 bit depth
        uint16_t *inrow, *outrow;

        for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
            int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
            int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
            int h = AV_CEIL_RSHIFT(inlink->h, vsub);
            int w = AV_CEIL_RSHIFT(inlink->w, hsub);
            const uint16_t *tab = s->lut[plane];
            const int in_linesize  =  in->linesize[plane] / 2;
            const int out_linesize = out->linesize[plane] / 2;

            inrow  = (uint16_t *)in ->data[plane];
            outrow = (uint16_t *)out->data[plane];

            for (i = 0; i < h; i++) {
                for (j = 0; j < w; j++) {
#if HAVE_BIGENDIAN
                    outrow[j] = av_bswap16(tab[av_bswap16(inrow[j])]);
#else
                    outrow[j] = tab[inrow[j]];
#endif
                }
                inrow  += in_linesize;
                outrow += out_linesize;
            }
        }
    } else {
        /* planar 8bit depth */
        uint8_t *inrow, *outrow;

        for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
            int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
            int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
            int h = AV_CEIL_RSHIFT(inlink->h, vsub);
            int w = AV_CEIL_RSHIFT(inlink->w, hsub);
            const uint16_t *tab = s->lut[plane];
            const int in_linesize  =  in->linesize[plane];
            const int out_linesize = out->linesize[plane];

            inrow  = in ->data[plane];
            outrow = out->data[plane];

            for (i = 0; i < h; i++) {
                for (j = 0; j < w; j++)
                    outrow[j] = tab[inrow[j]];
                inrow  += in_linesize;
                outrow += out_linesize;
            }
        }
    }

    if (!direct)
        av_frame_free(&in);

    return ff_filter_frame(outlink, out);
}

static const AVFilterPad inputs[] = {
    { .name         = "default",
      .type         = AVMEDIA_TYPE_VIDEO,
      .filter_frame = filter_frame,
      .config_props = config_props,
    },
    { NULL }
};
static const AVFilterPad outputs[] = {
    { .name = "default",
      .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

#define DEFINE_LUT_FILTER(name_, description_)                          \
    AVFilter ff_vf_##name_ = {                                          \
        .name          = #name_,                                        \
        .description   = NULL_IF_CONFIG_SMALL(description_),            \
        .priv_size     = sizeof(LutContext),                            \
        .priv_class    = &name_ ## _class,                              \
        .init          = name_##_init,                                  \
        .uninit        = uninit,                                        \
        .query_formats = query_formats,                                 \
        .inputs        = inputs,                                        \
        .outputs       = outputs,                                       \
        .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,        \
    }

#if CONFIG_LUT_FILTER

#define lut_options options
AVFILTER_DEFINE_CLASS(lut);

static int lut_init(AVFilterContext *ctx)
{
    return 0;
}

DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.");
#endif

#if CONFIG_LUTYUV_FILTER

#define lutyuv_options options
AVFILTER_DEFINE_CLASS(lutyuv);

static av_cold int lutyuv_init(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;

    s->is_yuv = 1;

    return 0;
}

DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.");
#endif

#if CONFIG_LUTRGB_FILTER

#define lutrgb_options options
AVFILTER_DEFINE_CLASS(lutrgb);

static av_cold int lutrgb_init(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;

    s->is_rgb = 1;

    return 0;
}

DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.");
#endif

#if CONFIG_NEGATE_FILTER

static const AVOption negate_options[] = {
    { "negate_alpha", NULL, OFFSET(negate_alpha), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
    { NULL }
};

AVFILTER_DEFINE_CLASS(negate);

static av_cold int negate_init(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;
    int i;

    av_log(ctx, AV_LOG_DEBUG, "negate_alpha:%d\n", s->negate_alpha);

    for (i = 0; i < 4; i++) {
        s->comp_expr_str[i] = av_strdup((i == 3 && !s->negate_alpha) ?
                                          "val" : "negval");
        if (!s->comp_expr_str[i]) {
            uninit(ctx);
            return AVERROR(ENOMEM);
        }
    }

    return 0;
}

DEFINE_LUT_FILTER(negate, "Negate input video.");

#endif
OpenPOWER on IntegriCloud