Add pad filter.
[libav.git] / libavfilter / vf_unsharp.c
1 /*
2 * Ported to FFmpeg from MPlayer libmpcodecs/unsharp.c
3 * Original copyright (C) 2002 Remi Guyomarch <rguyom@pobox.com>
4 * Port copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org>
5 * Relicensed to the LGPL with permission from Remi Guyomarch.
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /**
25 * @file
26 * blur / sharpen filter
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, 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 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 set_filter_param(&unsharp->luma, lmsize_x, lmsize_y, lamount);
137 set_filter_param(&unsharp->chroma, cmsize_x, cmsize_y, camount);
138
139 return 0;
140 }
141
142 static int query_formats(AVFilterContext *ctx)
143 {
144 enum PixelFormat pix_fmts[] = {
145 PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_YUV410P,
146 PIX_FMT_YUV411P, PIX_FMT_YUV440P, PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P,
147 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE
148 };
149
150 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
151
152 return 0;
153 }
154
155 static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
156 {
157 int z;
158 const char *effect;
159
160 effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
161
162 av_log(ctx, AV_LOG_INFO, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
163 effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
164
165 for (z = 0; z < 2 * fp->steps_y; z++)
166 fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
167 }
168
169 static int config_props(AVFilterLink *link)
170 {
171 UnsharpContext *unsharp = link->dst->priv;
172
173 init_filter_param(link->dst, &unsharp->luma, "luma", link->w);
174 init_filter_param(link->dst, &unsharp->chroma, "chroma", CHROMA_WIDTH(link));
175
176 return 0;
177 }
178
179 static void free_filter_param(FilterParam *fp)
180 {
181 int z;
182
183 for (z = 0; z < 2 * fp->steps_y; z++)
184 av_free(fp->sc[z]);
185 }
186
187 static av_cold void uninit(AVFilterContext *ctx)
188 {
189 UnsharpContext *unsharp = ctx->priv;
190
191 free_filter_param(&unsharp->luma);
192 free_filter_param(&unsharp->chroma);
193 }
194
195 static void end_frame(AVFilterLink *link)
196 {
197 UnsharpContext *unsharp = link->dst->priv;
198 AVFilterPicRef *in = link->cur_pic;
199 AVFilterPicRef *out = link->dst->outputs[0]->outpic;
200
201 unsharpen(out->data[0], in->data[0], out->linesize[0], in->linesize[0], link->w, link->h, &unsharp->luma);
202 unsharpen(out->data[1], in->data[1], out->linesize[1], in->linesize[1], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma);
203 unsharpen(out->data[2], in->data[2], out->linesize[2], in->linesize[2], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma);
204
205 avfilter_unref_pic(in);
206 avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
207 avfilter_end_frame(link->dst->outputs[0]);
208 avfilter_unref_pic(out);
209 }
210
211 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
212 {
213 }
214
215 AVFilter avfilter_vf_unsharp = {
216 .name = "unsharp",
217 .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
218
219 .priv_size = sizeof(UnsharpContext),
220
221 .init = init,
222 .uninit = uninit,
223 .query_formats = query_formats,
224
225 .inputs = (AVFilterPad[]) {{ .name = "default",
226 .type = AVMEDIA_TYPE_VIDEO,
227 .draw_slice = draw_slice,
228 .end_frame = end_frame,
229 .config_props = config_props,
230 .min_perms = AV_PERM_READ, },
231 { .name = NULL}},
232
233 .outputs = (AVFilterPad[]) {{ .name = "default",
234 .type = AVMEDIA_TYPE_VIDEO, },
235 { .name = NULL}},
236 };