h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / vf_unsharp.c
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 Libav.
7 *
8 * Libav 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 * Libav 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 Libav; 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 Libav 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 "formats.h"
41 #include "internal.h"
42 #include "video.h"
43 #include "libavutil/common.h"
44 #include "libavutil/mem.h"
45 #include "libavutil/opt.h"
46 #include "libavutil/pixdesc.h"
47
48 #define MIN_SIZE 3
49 #define MAX_SIZE 13
50
51 typedef struct FilterParam {
52 int msize_x; ///< matrix width
53 int msize_y; ///< matrix height
54 int amount; ///< effect amount
55 int steps_x; ///< horizontal step count
56 int steps_y; ///< vertical step count
57 int scalebits; ///< bits to shift pixel
58 int32_t halfscale; ///< amount to add to pixel
59 uint32_t *sc[(MAX_SIZE * MAX_SIZE) - 1]; ///< finite state machine storage
60 } FilterParam;
61
62 typedef struct UnsharpContext {
63 const AVClass *class;
64 int lmsize_x, lmsize_y, cmsize_x, cmsize_y;
65 float lamount, camount;
66 FilterParam luma; ///< luma parameters (width, height, amount)
67 FilterParam chroma; ///< chroma parameters (width, height, amount)
68 int hsub, vsub;
69 } UnsharpContext;
70
71 static void apply_unsharp( uint8_t *dst, int dst_stride,
72 const uint8_t *src, int src_stride,
73 int width, int height, FilterParam *fp)
74 {
75 uint32_t **sc = fp->sc;
76 uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2;
77
78 int32_t res;
79 int x, y, z;
80 const uint8_t *src2;
81
82 if (!fp->amount) {
83 if (dst_stride == src_stride)
84 memcpy(dst, src, src_stride * height);
85 else
86 for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
87 memcpy(dst, src, width);
88 return;
89 }
90
91 for (y = 0; y < 2 * fp->steps_y; y++)
92 memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));
93
94 for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
95 if (y < height)
96 src2 = src;
97
98 memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
99 for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
100 tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
101 for (z = 0; z < fp->steps_x * 2; z += 2) {
102 tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
103 tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
104 }
105 for (z = 0; z < fp->steps_y * 2; z += 2) {
106 tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
107 tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
108 }
109 if (x >= fp->steps_x && y >= fp->steps_y) {
110 const uint8_t *srx = src - fp->steps_y * src_stride + x - fp->steps_x;
111 uint8_t *dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x;
112
113 res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
114 *dsx = av_clip_uint8(res);
115 }
116 }
117 if (y >= 0) {
118 dst += dst_stride;
119 src += src_stride;
120 }
121 }
122 }
123
124 static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, float amount)
125 {
126 fp->msize_x = msize_x;
127 fp->msize_y = msize_y;
128 fp->amount = amount * 65536.0;
129
130 fp->steps_x = msize_x / 2;
131 fp->steps_y = msize_y / 2;
132 fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
133 fp->halfscale = 1 << (fp->scalebits - 1);
134 }
135
136 static av_cold int init(AVFilterContext *ctx)
137 {
138 UnsharpContext *unsharp = ctx->priv;
139
140 set_filter_param(&unsharp->luma, unsharp->lmsize_x, unsharp->lmsize_y, unsharp->lamount);
141 set_filter_param(&unsharp->chroma, unsharp->cmsize_x, unsharp->cmsize_y, unsharp->camount);
142
143 return 0;
144 }
145
146 static int query_formats(AVFilterContext *ctx)
147 {
148 enum AVPixelFormat pix_fmts[] = {
149 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P,
150 AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
151 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
152 };
153
154 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
155
156 return 0;
157 }
158
159 static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
160 {
161 int z;
162 const char *effect;
163
164 effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
165
166 av_log(ctx, AV_LOG_VERBOSE, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
167 effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
168
169 for (z = 0; z < 2 * fp->steps_y; z++)
170 fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
171 }
172
173 static int config_props(AVFilterLink *link)
174 {
175 UnsharpContext *unsharp = link->dst->priv;
176 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
177
178 unsharp->hsub = desc->log2_chroma_w;
179 unsharp->vsub = desc->log2_chroma_h;
180
181 init_filter_param(link->dst, &unsharp->luma, "luma", link->w);
182 init_filter_param(link->dst, &unsharp->chroma, "chroma", AV_CEIL_RSHIFT(link->w, unsharp->hsub));
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 int filter_frame(AVFilterLink *link, AVFrame *in)
204 {
205 UnsharpContext *unsharp = link->dst->priv;
206 AVFilterLink *outlink = link->dst->outputs[0];
207 AVFrame *out;
208 int cw = AV_CEIL_RSHIFT(link->w, unsharp->hsub);
209 int ch = AV_CEIL_RSHIFT(link->h, unsharp->vsub);
210
211 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
212 if (!out) {
213 av_frame_free(&in);
214 return AVERROR(ENOMEM);
215 }
216 av_frame_copy_props(out, in);
217
218 apply_unsharp(out->data[0], out->linesize[0], in->data[0], in->linesize[0], link->w, link->h, &unsharp->luma);
219 apply_unsharp(out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw, ch, &unsharp->chroma);
220 apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw, ch, &unsharp->chroma);
221
222 av_frame_free(&in);
223 return ff_filter_frame(outlink, out);
224 }
225
226 #define OFFSET(x) offsetof(UnsharpContext, x)
227 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
228 static const AVOption options[] = {
229 { "luma_msize_x", "luma matrix horizontal size", OFFSET(lmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
230 { "luma_msize_y", "luma matrix vertical size", OFFSET(lmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
231 { "luma_amount", "luma effect strength", OFFSET(lamount), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, -2, 5, FLAGS },
232 { "chroma_msize_x", "chroma matrix horizontal size", OFFSET(cmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
233 { "chroma_msize_y", "chroma matrix vertical size", OFFSET(cmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
234 { "chroma_amount", "chroma effect strength", OFFSET(camount), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -2, 5, FLAGS },
235 { NULL },
236 };
237
238 static const AVClass unsharp_class = {
239 .class_name = "unsharp",
240 .item_name = av_default_item_name,
241 .option = options,
242 .version = LIBAVUTIL_VERSION_INT,
243 };
244
245 static const AVFilterPad avfilter_vf_unsharp_inputs[] = {
246 {
247 .name = "default",
248 .type = AVMEDIA_TYPE_VIDEO,
249 .filter_frame = filter_frame,
250 .config_props = config_props,
251 },
252 { NULL }
253 };
254
255 static const AVFilterPad avfilter_vf_unsharp_outputs[] = {
256 {
257 .name = "default",
258 .type = AVMEDIA_TYPE_VIDEO,
259 },
260 { NULL }
261 };
262
263 AVFilter ff_vf_unsharp = {
264 .name = "unsharp",
265 .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
266
267 .priv_size = sizeof(UnsharpContext),
268 .priv_class = &unsharp_class,
269
270 .init = init,
271 .uninit = uninit,
272 .query_formats = query_formats,
273
274 .inputs = avfilter_vf_unsharp_inputs,
275
276 .outputs = avfilter_vf_unsharp_outputs,
277 };