Statistics
| Branch: | Revision:

ffmpeg / libavfilter / vf_unsharp.c @ e6e7ba0c

History | View | Annotate | Download (8.69 KB)

1
/*
2
 * Original copyright (c) 2002 Remi Guyomarch <rguyom@pobox.com>
3
 * Port copyright (c) 2010 Daniel G. Taylor <dan@programmer-art.org>
4
 * Relicensed to the LGPL with permission from Remi Guyomarch.
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
/**
24
 * @file
25
 * blur / sharpen filter, ported to FFmpeg from MPlayer
26
 * libmpcodecs/unsharp.c.
27
 *
28
 * This code is based on:
29
 *
30
 * An Efficient algorithm for Gaussian blur using finite-state machines
31
 * Frederick M. Waltz and John W. V. Miller
32
 *
33
 * SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII
34
 * Originally published Boston, Nov 98
35
 *
36
 * http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf
37
 */
38

    
39
#include "avfilter.h"
40
#include "libavutil/common.h"
41
#include "libavutil/mem.h"
42
#include "libavutil/pixdesc.h"
43

    
44
#define MIN_SIZE 3
45
#define MAX_SIZE 13
46

    
47
#define CHROMA_WIDTH(link)  -((-link->w) >> av_pix_fmt_descriptors[link->format].log2_chroma_w)
48
#define CHROMA_HEIGHT(link) -((-link->h) >> av_pix_fmt_descriptors[link->format].log2_chroma_h)
49

    
50
typedef struct FilterParam {
51
    int msize_x;                             ///< matrix width
52
    int msize_y;                             ///< matrix height
53
    int amount;                              ///< effect amount
54
    int steps_x;                             ///< horizontal step count
55
    int steps_y;                             ///< vertical step count
56
    int scalebits;                           ///< bits to shift pixel
57
    int32_t halfscale;                       ///< amount to add to pixel
58
    uint32_t *sc[(MAX_SIZE * MAX_SIZE) - 1]; ///< finite state machine storage
59
} FilterParam;
60

    
61
typedef struct {
62
    FilterParam luma;   ///< luma parameters (width, height, amount)
63
    FilterParam chroma; ///< chroma parameters (width, height, amount)
64
} UnsharpContext;
65

    
66
static void unsharpen(uint8_t *dst, const uint8_t *src, int dst_stride, int src_stride, int width, int height, FilterParam *fp)
67
{
68
    uint32_t **sc = fp->sc;
69
    uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2;
70

    
71
    int32_t res;
72
    int x, y, z;
73

    
74
    if (!fp->amount) {
75
        if (dst_stride == src_stride)
76
            memcpy(dst, src, src_stride * height);
77
        else
78
            for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
79
                memcpy(dst, src, width);
80
        return;
81
    }
82

    
83
    for (y = 0; y < 2 * fp->steps_y; y++)
84
        memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));
85

    
86
    for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
87
        memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
88
        for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
89
            tmp1 = x <= 0 ? src[0] : x >= width ? src[width-1] : src[x];
90
            for (z = 0; z < fp->steps_x * 2; z += 2) {
91
                tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
92
                tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
93
            }
94
            for (z = 0; z < fp->steps_y * 2; z += 2) {
95
                tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
96
                tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
97
            }
98
            if (x >= fp->steps_x && y >= fp->steps_y) {
99
                const uint8_t* srx = src - fp->steps_y * src_stride + x - fp->steps_x;
100
                uint8_t* dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x;
101

    
102
                res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
103
                *dsx = av_clip_uint8(res);
104
            }
105
        }
106
        if (y >= 0) {
107
            dst += dst_stride;
108
            src += src_stride;
109
        }
110
    }
111
}
112

    
113
static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount)
114
{
115
    fp->msize_x = msize_x;
116
    fp->msize_y = msize_y;
117
    fp->amount = amount * 65536.0;
118

    
119
    fp->steps_x = msize_x / 2;
120
    fp->steps_y = msize_y / 2;
121
    fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
122
    fp->halfscale = 1 << (fp->scalebits - 1);
123
}
124

    
125
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
126
{
127
    UnsharpContext *unsharp = ctx->priv;
128
    int lmsize_x = 5, cmsize_x = 0;
129
    int lmsize_y = 5, cmsize_y = 0;
130
    double lamount = 1.0f, camount = 0.0f;
131

    
132
    if (args)
133
        sscanf(args, "%d:%d:%lf:%d:%d:%lf", &lmsize_x, &lmsize_y, &lamount,
134
                                            &cmsize_x, &cmsize_y, &camount);
135

    
136
    if ((lamount && (lmsize_x < 2 || lmsize_y < 2)) ||
137
        (camount && (cmsize_x < 2 || cmsize_y < 2))) {
138
        av_log(ctx, AV_LOG_ERROR,
139
               "Invalid value <2 for lmsize_x:%d or lmsize_y:%d or cmsize_x:%d or cmsize_y:%d\n",
140
               lmsize_x, lmsize_y, cmsize_x, cmsize_y);
141
        return AVERROR(EINVAL);
142
    }
143

    
144
    set_filter_param(&unsharp->luma,   lmsize_x, lmsize_y, lamount);
145
    set_filter_param(&unsharp->chroma, cmsize_x, cmsize_y, camount);
146

    
147
    return 0;
148
}
149

    
150
static int query_formats(AVFilterContext *ctx)
151
{
152
    enum PixelFormat pix_fmts[] = {
153
        PIX_FMT_YUV420P,  PIX_FMT_YUV422P,  PIX_FMT_YUV444P,  PIX_FMT_YUV410P,
154
        PIX_FMT_YUV411P,  PIX_FMT_YUV440P,  PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P,
155
        PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE
156
    };
157

    
158
    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
159

    
160
    return 0;
161
}
162

    
163
static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
164
{
165
    int z;
166
    const char *effect;
167

    
168
    effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
169

    
170
    av_log(ctx, AV_LOG_INFO, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
171
           effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
172

    
173
    for (z = 0; z < 2 * fp->steps_y; z++)
174
        fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
175
}
176

    
177
static int config_props(AVFilterLink *link)
178
{
179
    UnsharpContext *unsharp = link->dst->priv;
180

    
181
    init_filter_param(link->dst, &unsharp->luma,   "luma",   link->w);
182
    init_filter_param(link->dst, &unsharp->chroma, "chroma", CHROMA_WIDTH(link));
183

    
184
    return 0;
185
}
186

    
187
static void free_filter_param(FilterParam *fp)
188
{
189
    int z;
190

    
191
    for (z = 0; z < 2 * fp->steps_y; z++)
192
        av_free(fp->sc[z]);
193
}
194

    
195
static av_cold void uninit(AVFilterContext *ctx)
196
{
197
    UnsharpContext *unsharp = ctx->priv;
198

    
199
    free_filter_param(&unsharp->luma);
200
    free_filter_param(&unsharp->chroma);
201
}
202

    
203
static void end_frame(AVFilterLink *link)
204
{
205
    UnsharpContext *unsharp = link->dst->priv;
206
    AVFilterBufferRef *in  = link->cur_buf;
207
    AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
208

    
209
    unsharpen(out->data[0], in->data[0], out->linesize[0], in->linesize[0], link->w,            link->h,             &unsharp->luma);
210
    unsharpen(out->data[1], in->data[1], out->linesize[1], in->linesize[1], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma);
211
    unsharpen(out->data[2], in->data[2], out->linesize[2], in->linesize[2], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma);
212

    
213
    avfilter_unref_buffer(in);
214
    avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
215
    avfilter_end_frame(link->dst->outputs[0]);
216
    avfilter_unref_buffer(out);
217
}
218

    
219
static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
220
{
221
}
222

    
223
AVFilter avfilter_vf_unsharp = {
224
    .name      = "unsharp",
225
    .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
226

    
227
    .priv_size = sizeof(UnsharpContext),
228

    
229
    .init = init,
230
    .uninit = uninit,
231
    .query_formats = query_formats,
232

    
233
    .inputs    = (AVFilterPad[]) {{ .name             = "default",
234
                                    .type             = AVMEDIA_TYPE_VIDEO,
235
                                    .draw_slice       = draw_slice,
236
                                    .end_frame        = end_frame,
237
                                    .config_props     = config_props,
238
                                    .min_perms        = AV_PERM_READ, },
239
                                  { .name = NULL}},
240

    
241
    .outputs   = (AVFilterPad[]) {{ .name             = "default",
242
                                    .type             = AVMEDIA_TYPE_VIDEO, },
243
                                  { .name = NULL}},
244
};