aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/vf_unsharp.c
blob: 9c0809f331c72efa413bb5c84dbb6caedbadaa97 (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
/*
 * Original copyright (c) 2002 Remi Guyomarch <rguyom@pobox.com>
 * Port copyright (c) 2010 Daniel G. Taylor <dan@programmer-art.org>
 * Relicensed to the LGPL with permission from Remi Guyomarch.
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * blur / sharpen filter, ported to Libav from MPlayer
 * libmpcodecs/unsharp.c.
 *
 * This code is based on:
 *
 * An Efficient algorithm for Gaussian blur using finite-state machines
 * Frederick M. Waltz and John W. V. Miller
 *
 * SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII
 * Originally published Boston, Nov 98
 *
 * http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf
 */

#include "avfilter.h"
#include "formats.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"

#define MIN_SIZE 3
#define MAX_SIZE 13

/* right-shift and round-up */
#define SHIFTUP(x,shift) (-((-(x))>>(shift)))

typedef struct FilterParam {
    int msize_x;                             ///< matrix width
    int msize_y;                             ///< matrix height
    int amount;                              ///< effect amount
    int steps_x;                             ///< horizontal step count
    int steps_y;                             ///< vertical step count
    int scalebits;                           ///< bits to shift pixel
    int32_t halfscale;                       ///< amount to add to pixel
    uint32_t *sc[(MAX_SIZE * MAX_SIZE) - 1]; ///< finite state machine storage
} FilterParam;

typedef struct {
    FilterParam luma;   ///< luma parameters (width, height, amount)
    FilterParam chroma; ///< chroma parameters (width, height, amount)
    int hsub, vsub;
} UnsharpContext;

static void apply_unsharp(      uint8_t *dst, int dst_stride,
                          const uint8_t *src, int src_stride,
                          int width, int height, FilterParam *fp)
{
    uint32_t **sc = fp->sc;
    uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2;

    int32_t res;
    int x, y, z;
    const uint8_t *src2;

    if (!fp->amount) {
        if (dst_stride == src_stride)
            memcpy(dst, src, src_stride * height);
        else
            for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
                memcpy(dst, src, width);
        return;
    }

    for (y = 0; y < 2 * fp->steps_y; y++)
        memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));

    for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
        if (y < height)
            src2 = src;

        memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
        for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
            tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
            for (z = 0; z < fp->steps_x * 2; z += 2) {
                tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
                tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
            }
            for (z = 0; z < fp->steps_y * 2; z += 2) {
                tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
                tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
            }
            if (x >= fp->steps_x && y >= fp->steps_y) {
                const uint8_t *srx = src - fp->steps_y * src_stride + x - fp->steps_x;
                uint8_t *dsx       = dst - fp->steps_y * dst_stride + x - fp->steps_x;

                res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
                *dsx = av_clip_uint8(res);
            }
        }
        if (y >= 0) {
            dst += dst_stride;
            src += src_stride;
        }
    }
}

static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount)
{
    fp->msize_x = msize_x;
    fp->msize_y = msize_y;
    fp->amount = amount * 65536.0;

    fp->steps_x = msize_x / 2;
    fp->steps_y = msize_y / 2;
    fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
    fp->halfscale = 1 << (fp->scalebits - 1);
}

static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
    UnsharpContext *unsharp = ctx->priv;
    int lmsize_x = 5, cmsize_x = 5;
    int lmsize_y = 5, cmsize_y = 5;
    double lamount = 1.0f, camount = 0.0f;

    if (args)
        sscanf(args, "%d:%d:%lf:%d:%d:%lf", &lmsize_x, &lmsize_y, &lamount,
                                            &cmsize_x, &cmsize_y, &camount);

    if ((lamount && (lmsize_x < 2 || lmsize_y < 2)) ||
        (camount && (cmsize_x < 2 || cmsize_y < 2))) {
        av_log(ctx, AV_LOG_ERROR,
               "Invalid value <2 for lmsize_x:%d or lmsize_y:%d or cmsize_x:%d or cmsize_y:%d\n",
               lmsize_x, lmsize_y, cmsize_x, cmsize_y);
        return AVERROR(EINVAL);
    }

    set_filter_param(&unsharp->luma,   lmsize_x, lmsize_y, lamount);
    set_filter_param(&unsharp->chroma, cmsize_x, cmsize_y, camount);

    return 0;
}

static int query_formats(AVFilterContext *ctx)
{
    enum PixelFormat pix_fmts[] = {
        PIX_FMT_YUV420P,  PIX_FMT_YUV422P,  PIX_FMT_YUV444P,  PIX_FMT_YUV410P,
        PIX_FMT_YUV411P,  PIX_FMT_YUV440P,  PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P,
        PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE
    };

    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

    return 0;
}

static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
{
    int z;
    const char *effect;

    effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";

    av_log(ctx, AV_LOG_INFO, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
           effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);

    for (z = 0; z < 2 * fp->steps_y; z++)
        fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
}

static int config_props(AVFilterLink *link)
{
    UnsharpContext *unsharp = link->dst->priv;

    unsharp->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
    unsharp->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;

    init_filter_param(link->dst, &unsharp->luma,   "luma",   link->w);
    init_filter_param(link->dst, &unsharp->chroma, "chroma", SHIFTUP(link->w, unsharp->hsub));

    return 0;
}

static void free_filter_param(FilterParam *fp)
{
    int z;

    for (z = 0; z < 2 * fp->steps_y; z++)
        av_free(fp->sc[z]);
}

static av_cold void uninit(AVFilterContext *ctx)
{
    UnsharpContext *unsharp = ctx->priv;

    free_filter_param(&unsharp->luma);
    free_filter_param(&unsharp->chroma);
}

static void end_frame(AVFilterLink *link)
{
    UnsharpContext *unsharp = link->dst->priv;
    AVFilterBufferRef *in  = link->cur_buf;
    AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
    int cw = SHIFTUP(link->w, unsharp->hsub);
    int ch = SHIFTUP(link->h, unsharp->vsub);

    apply_unsharp(out->data[0], out->linesize[0], in->data[0], in->linesize[0], link->w, link->h, &unsharp->luma);
    apply_unsharp(out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw,      ch,      &unsharp->chroma);
    apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw,      ch,      &unsharp->chroma);

    avfilter_unref_buffer(in);
    avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
    avfilter_end_frame(link->dst->outputs[0]);
    avfilter_unref_buffer(out);
}

static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
}

AVFilter avfilter_vf_unsharp = {
    .name      = "unsharp",
    .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),

    .priv_size = sizeof(UnsharpContext),

    .init = init,
    .uninit = uninit,
    .query_formats = query_formats,

    .inputs    = (AVFilterPad[]) {{ .name             = "default",
                                    .type             = AVMEDIA_TYPE_VIDEO,
                                    .draw_slice       = draw_slice,
                                    .end_frame        = end_frame,
                                    .config_props     = config_props,
                                    .min_perms        = AV_PERM_READ, },
                                  { .name = NULL}},

    .outputs   = (AVFilterPad[]) {{ .name             = "default",
                                    .type             = AVMEDIA_TYPE_VIDEO, },
                                  { .name = NULL}},
};