summaryrefslogtreecommitdiffstats
path: root/libavfilter/vf_gblur.c
blob: e71b33da800930434a3a6a9d34a41089f5c9414e (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
/*
 * Copyright (c) 2011 Pascal Getreuer
 * Copyright (c) 2016 Paul B Mahol
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "gblur.h"
#include "internal.h"
#include "video.h"

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

static const AVOption gblur_options[] = {
    { "sigma",  "set sigma",            OFFSET(sigma),  AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0.0, 1024, FLAGS },
    { "steps",  "set number of steps",  OFFSET(steps),  AV_OPT_TYPE_INT,   {.i64=1},     1,    6, FLAGS },
    { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT,   {.i64=0xF},   0,  0xF, FLAGS },
    { "sigmaV", "set vertical sigma",   OFFSET(sigmaV), AV_OPT_TYPE_FLOAT, {.dbl=-1},   -1, 1024, FLAGS },
    { NULL }
};

AVFILTER_DEFINE_CLASS(gblur);

typedef struct ThreadData {
    int height;
    int width;
} ThreadData;

static void horiz_slice_c(float *buffer, int width, int height, int steps,
                          float nu, float bscale)
{
    int step, x, y;
    float *ptr;
    for (y = 0; y < height; y++) {
        for (step = 0; step < steps; step++) {
            ptr = buffer + width * y;
            ptr[0] *= bscale;

            /* Filter rightwards */
            for (x = 1; x < width; x++)
                ptr[x] += nu * ptr[x - 1];
            ptr[x = width - 1] *= bscale;

            /* Filter leftwards */
            for (; x > 0; x--)
                ptr[x - 1] += nu * ptr[x];
        }
    }
}

static int filter_horizontally(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
    GBlurContext *s = ctx->priv;
    ThreadData *td = arg;
    const int height = td->height;
    const int width = td->width;
    const int slice_start = (height *  jobnr   ) / nb_jobs;
    const int slice_end   = (height * (jobnr+1)) / nb_jobs;
    const float boundaryscale = s->boundaryscale;
    const int steps = s->steps;
    const float nu = s->nu;
    float *buffer = s->buffer;

    s->horiz_slice(buffer + width * slice_start, width, slice_end - slice_start,
                   steps, nu, boundaryscale);
    emms_c();
    return 0;
}

static void do_vertical_columns(float *buffer, int width, int height,
                                int column_begin, int column_end, int steps,
                                float nu, float boundaryscale, int column_step)
{
    const int numpixels = width * height;
    int i, x, k, step;
    float *ptr;
    for (x = column_begin; x < column_end;) {
        for (step = 0; step < steps; step++) {
            ptr = buffer + x;
            for (k = 0; k < column_step; k++) {
                ptr[k] *= boundaryscale;
            }
            /* Filter downwards */
            for (i = width; i < numpixels; i += width) {
                for (k = 0; k < column_step; k++) {
                    ptr[i + k] += nu * ptr[i - width + k];
                }
            }
            i = numpixels - width;

            for (k = 0; k < column_step; k++)
                ptr[i + k] *= boundaryscale;

            /* Filter upwards */
            for (; i > 0; i -= width) {
                for (k = 0; k < column_step; k++)
                    ptr[i - width + k] += nu * ptr[i + k];
            }
        }
        x += column_step;
    }
}

static int filter_vertically(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
    GBlurContext *s = ctx->priv;
    ThreadData *td = arg;
    const int height = td->height;
    const int width = td->width;
    const int slice_start = (width *  jobnr   ) / nb_jobs;
    const int slice_end   = (width * (jobnr+1)) / nb_jobs;
    const float boundaryscale = s->boundaryscaleV;
    const int steps = s->steps;
    const float nu = s->nuV;
    float *buffer = s->buffer;
    int aligned_end;

    aligned_end = slice_start + (((slice_end - slice_start) >> 3) << 3);
    /* Filter vertically along columns (process 8 columns in each step) */
    do_vertical_columns(buffer, width, height, slice_start, aligned_end,
                        steps, nu, boundaryscale, 8);

    /* Filter un-aligned columns one by one */
    do_vertical_columns(buffer, width, height, aligned_end, slice_end,
                        steps, nu, boundaryscale, 1);
    return 0;
}


static int filter_postscale(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
    GBlurContext *s = ctx->priv;
    ThreadData *td = arg;
    const int height = td->height;
    const int width = td->width;
    const int64_t numpixels = width * (int64_t)height;
    const unsigned slice_start = (numpixels *  jobnr   ) / nb_jobs;
    const unsigned slice_end   = (numpixels * (jobnr+1)) / nb_jobs;
    const float postscale = s->postscale * s->postscaleV;
    float *buffer = s->buffer;
    unsigned i;

    for (i = slice_start; i < slice_end; i++)
        buffer[i] *= postscale;

    return 0;
}

static void gaussianiir2d(AVFilterContext *ctx, int plane)
{
    GBlurContext *s = ctx->priv;
    const int width = s->planewidth[plane];
    const int height = s->planeheight[plane];
    const int nb_threads = ff_filter_get_nb_threads(ctx);
    ThreadData td;

    if (s->sigma <= 0 || s->steps < 0)
        return;

    td.width = width;
    td.height = height;
    ctx->internal->execute(ctx, filter_horizontally, &td, NULL, FFMIN(height, nb_threads));
    ctx->internal->execute(ctx, filter_vertically, &td, NULL, FFMIN(width, nb_threads));
    ctx->internal->execute(ctx, filter_postscale, &td, NULL, FFMIN(width * height, nb_threads));
}

static int query_formats(AVFilterContext *ctx)
{
    static const enum AVPixelFormat pix_fmts[] = {
        AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
        AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
        AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
        AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
        AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
        AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
        AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
        AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
        AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
        AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
        AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
        AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
        AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
        AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
        AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
        AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
        AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
        AV_PIX_FMT_NONE
    };

    return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
}

void ff_gblur_init(GBlurContext *s)
{
    s->horiz_slice = horiz_slice_c;
    if (ARCH_X86_64)
        ff_gblur_init_x86(s);
}

static int config_input(AVFilterLink *inlink)
{
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
    GBlurContext *s = inlink->dst->priv;

    s->depth = desc->comp[0].depth;
    s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
    s->planewidth[0] = s->planewidth[3] = inlink->w;
    s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
    s->planeheight[0] = s->planeheight[3] = inlink->h;

    s->nb_planes = av_pix_fmt_count_planes(inlink->format);

    s->buffer = av_malloc_array(inlink->w, inlink->h * sizeof(*s->buffer));
    if (!s->buffer)
        return AVERROR(ENOMEM);

    if (s->sigmaV < 0) {
        s->sigmaV = s->sigma;
    }
    ff_gblur_init(s);

    return 0;
}

static void set_params(float sigma, int steps, float *postscale, float *boundaryscale, float *nu)
{
    double dnu, lambda;

    lambda = (sigma * sigma) / (2.0 * steps);
    dnu = (1.0 + 2.0 * lambda - sqrt(1.0 + 4.0 * lambda)) / (2.0 * lambda);
    *postscale = pow(dnu / lambda, steps);
    *boundaryscale = 1.0 / (1.0 - dnu);
    *nu = (float)dnu;
}

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

    set_params(s->sigma,  s->steps, &s->postscale,  &s->boundaryscale,  &s->nu);
    set_params(s->sigmaV, s->steps, &s->postscaleV, &s->boundaryscaleV, &s->nuV);

    if (av_frame_is_writable(in)) {
        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);
    }

    for (plane = 0; plane < s->nb_planes; plane++) {
        const int height = s->planeheight[plane];
        const int width = s->planewidth[plane];
        float *bptr = s->buffer;
        const uint8_t *src = in->data[plane];
        const uint16_t *src16 = (const uint16_t *)in->data[plane];
        uint8_t *dst = out->data[plane];
        uint16_t *dst16 = (uint16_t *)out->data[plane];
        int y, x;

        if (!s->sigma || !(s->planes & (1 << plane))) {
            if (out != in)
                av_image_copy_plane(out->data[plane], out->linesize[plane],
                                    in->data[plane], in->linesize[plane],
                                    width * ((s->depth + 7) / 8), height);
            continue;
        }

        if (s->depth == 8) {
            for (y = 0; y < height; y++) {
                for (x = 0; x < width; x++) {
                    bptr[x] = src[x];
                }
                bptr += width;
                src += in->linesize[plane];
            }
        } else {
            for (y = 0; y < height; y++) {
                for (x = 0; x < width; x++) {
                    bptr[x] = src16[x];
                }
                bptr += width;
                src16 += in->linesize[plane] / 2;
            }
        }

        gaussianiir2d(ctx, plane);

        bptr = s->buffer;
        if (s->depth == 8) {
            for (y = 0; y < height; y++) {
                for (x = 0; x < width; x++) {
                    dst[x] = bptr[x];
                }
                bptr += width;
                dst += out->linesize[plane];
            }
        } else {
            for (y = 0; y < height; y++) {
                for (x = 0; x < width; x++) {
                    dst16[x] = bptr[x];
                }
                bptr += width;
                dst16 += out->linesize[plane] / 2;
            }
        }
    }

    if (out != in)
        av_frame_free(&in);
    return ff_filter_frame(outlink, out);
}

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

    av_freep(&s->buffer);
}

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

static const AVFilterPad gblur_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

AVFilter ff_vf_gblur = {
    .name          = "gblur",
    .description   = NULL_IF_CONFIG_SMALL("Apply Gaussian Blur filter."),
    .priv_size     = sizeof(GBlurContext),
    .priv_class    = &gblur_class,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = gblur_inputs,
    .outputs       = gblur_outputs,
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};
OpenPOWER on IntegriCloud