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.
6 * This file is part of Libav.
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.
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.
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
25 * blur / sharpen filter, ported to Libav from MPlayer
26 * libmpcodecs/unsharp.c.
28 * This code is based on:
30 * An Efficient algorithm for Gaussian blur using finite-state machines
31 * Frederick M. Waltz and John W. V. Miller
33 * SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII
34 * Originally published Boston, Nov 98
36 * http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf
41 #include "libavutil/common.h"
42 #include "libavutil/mem.h"
43 #include "libavutil/pixdesc.h"
48 /* right-shift and round-up */
49 #define SHIFTUP(x,shift) (-((-(x))>>(shift)))
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
63 FilterParam luma; ///< luma parameters (width, height, amount)
64 FilterParam chroma; ///< chroma parameters (width, height, amount)
68 static void apply_unsharp( uint8_t *dst, int dst_stride,
69 const uint8_t *src, int src_stride,
70 int width, int height, FilterParam *fp)
72 uint32_t **sc = fp->sc;
73 uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2;
80 if (dst_stride == src_stride)
81 memcpy(dst, src, src_stride * height);
83 for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
84 memcpy(dst, src, width);
88 for (y = 0; y < 2 * fp->steps_y; y++)
89 memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));
91 for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
95 memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
96 for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
97 tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
98 for (z = 0; z < fp->steps_x * 2; z += 2) {
99 tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
100 tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
102 for (z = 0; z < fp->steps_y * 2; z += 2) {
103 tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
104 tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
106 if (x >= fp->steps_x && y >= fp->steps_y) {
107 const uint8_t *srx = src - fp->steps_y * src_stride + x - fp->steps_x;
108 uint8_t *dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x;
110 res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
111 *dsx = av_clip_uint8(res);
121 static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount)
123 fp->msize_x = msize_x;
124 fp->msize_y = msize_y;
125 fp->amount = amount * 65536.0;
127 fp->steps_x = msize_x / 2;
128 fp->steps_y = msize_y / 2;
129 fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
130 fp->halfscale = 1 << (fp->scalebits - 1);
133 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
135 UnsharpContext *unsharp = ctx->priv;
136 int lmsize_x = 5, cmsize_x = 5;
137 int lmsize_y = 5, cmsize_y = 5;
138 double lamount = 1.0f, camount = 0.0f;
141 sscanf(args, "%d:%d:%lf:%d:%d:%lf", &lmsize_x, &lmsize_y, &lamount,
142 &cmsize_x, &cmsize_y, &camount);
144 if ((lamount && (lmsize_x < 2 || lmsize_y < 2)) ||
145 (camount && (cmsize_x < 2 || cmsize_y < 2))) {
146 av_log(ctx, AV_LOG_ERROR,
147 "Invalid value <2 for lmsize_x:%d or lmsize_y:%d or cmsize_x:%d or cmsize_y:%d\n",
148 lmsize_x, lmsize_y, cmsize_x, cmsize_y);
149 return AVERROR(EINVAL);
152 set_filter_param(&unsharp->luma, lmsize_x, lmsize_y, lamount);
153 set_filter_param(&unsharp->chroma, cmsize_x, cmsize_y, camount);
158 static int query_formats(AVFilterContext *ctx)
160 enum PixelFormat pix_fmts[] = {
161 PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_YUV410P,
162 PIX_FMT_YUV411P, PIX_FMT_YUV440P, PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P,
163 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE
166 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
171 static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
176 effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
178 av_log(ctx, AV_LOG_INFO, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
179 effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
181 for (z = 0; z < 2 * fp->steps_y; z++)
182 fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
185 static int config_props(AVFilterLink *link)
187 UnsharpContext *unsharp = link->dst->priv;
189 unsharp->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
190 unsharp->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
192 init_filter_param(link->dst, &unsharp->luma, "luma", link->w);
193 init_filter_param(link->dst, &unsharp->chroma, "chroma", SHIFTUP(link->w, unsharp->hsub));
198 static void free_filter_param(FilterParam *fp)
202 for (z = 0; z < 2 * fp->steps_y; z++)
206 static av_cold void uninit(AVFilterContext *ctx)
208 UnsharpContext *unsharp = ctx->priv;
210 free_filter_param(&unsharp->luma);
211 free_filter_param(&unsharp->chroma);
214 static void end_frame(AVFilterLink *link)
216 UnsharpContext *unsharp = link->dst->priv;
217 AVFilterBufferRef *in = link->cur_buf;
218 AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
219 int cw = SHIFTUP(link->w, unsharp->hsub);
220 int ch = SHIFTUP(link->h, unsharp->vsub);
222 apply_unsharp(out->data[0], out->linesize[0], in->data[0], in->linesize[0], link->w, link->h, &unsharp->luma);
223 apply_unsharp(out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw, ch, &unsharp->chroma);
224 apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw, ch, &unsharp->chroma);
226 avfilter_unref_buffer(in);
227 avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
228 avfilter_end_frame(link->dst->outputs[0]);
229 avfilter_unref_buffer(out);
232 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
236 AVFilter avfilter_vf_unsharp = {
238 .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
240 .priv_size = sizeof(UnsharpContext),
244 .query_formats = query_formats,
246 .inputs = (AVFilterPad[]) {{ .name = "default",
247 .type = AVMEDIA_TYPE_VIDEO,
248 .draw_slice = draw_slice,
249 .end_frame = end_frame,
250 .config_props = config_props,
251 .min_perms = AV_PERM_READ, },
254 .outputs = (AVFilterPad[]) {{ .name = "default",
255 .type = AVMEDIA_TYPE_VIDEO, },