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 50typedef 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 61typedef struct { 62 FilterParam luma; ///< luma parameters (width, height, amount) 63 FilterParam chroma; ///< chroma parameters (width, height, amount) 64} UnsharpContext; 65 66static 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 113static 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 125static 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 142static 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 155static 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 169static 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 179static 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 187static 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 195static 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 211static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir) 212{ 213} 214 215AVFilter 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}; 237