| /* |
| * Ported to FFmpeg from MPlayer libmpcodecs/unsharp.c |
| * Original copyright (C) 2002 Remi Guyomarch <rguyom@pobox.com> |
| * Port copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org> |
| * Relicensed to the LGPL with permission from Remi Guyomarch. |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * blur / sharpen filter |
| * |
| * This code is based on: |
| * |
| * An Efficient algorithm for Gaussian blur using finite-state machines |
| * Frederick M. Waltz and John W. V. Miller |
| * |
| * SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII |
| * Originally published Boston, Nov 98 |
| * |
| * http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf |
| */ |
| |
| #include "avfilter.h" |
| #include "libavutil/common.h" |
| #include "libavutil/mem.h" |
| #include "libavutil/pixdesc.h" |
| |
| #define MIN_SIZE 3 |
| #define MAX_SIZE 13 |
| |
| #define CHROMA_WIDTH(link) -((-link->w) >> av_pix_fmt_descriptors[link->format].log2_chroma_w) |
| #define CHROMA_HEIGHT(link) -((-link->h) >> av_pix_fmt_descriptors[link->format].log2_chroma_h) |
| |
| typedef struct FilterParam { |
| int msize_x; ///< matrix width |
| int msize_y; ///< matrix height |
| int amount; ///< effect amount |
| int steps_x; ///< horizontal step count |
| int steps_y; ///< vertical step count |
| int scalebits; ///< bits to shift pixel |
| int32_t halfscale; ///< amount to add to pixel |
| uint32_t *sc[(MAX_SIZE * MAX_SIZE) - 1]; ///< finite state machine storage |
| } FilterParam; |
| |
| typedef struct { |
| FilterParam luma; ///< luma parameters (width, height, amount) |
| FilterParam chroma; ///< chroma parameters (width, height, amount) |
| } UnsharpContext; |
| |
| static void unsharpen(uint8_t *dst, uint8_t *src, int dst_stride, int src_stride, int width, int height, FilterParam *fp) |
| { |
| uint32_t **sc = fp->sc; |
| uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2; |
| |
| int32_t res; |
| int x, y, z; |
| |
| if (!fp->amount) { |
| if (dst_stride == src_stride) |
| memcpy(dst, src, src_stride * height); |
| else |
| for (y = 0; y < height; y++, dst += dst_stride, src += src_stride) |
| memcpy(dst, src, width); |
| return; |
| } |
| |
| for (y = 0; y < 2 * fp->steps_y; y++) |
| memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x)); |
| |
| for (y =- fp->steps_y; y < height + fp->steps_y; y++) { |
| memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1)); |
| for (x =- fp->steps_x; x < width + fp->steps_x; x++) { |
| tmp1 = x <= 0 ? src[0] : x >= width ? src[width-1] : src[x]; |
| for (z = 0; z < fp->steps_x * 2; z += 2) { |
| tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1; |
| tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2; |
| } |
| for (z = 0; z < fp->steps_y * 2; z += 2) { |
| tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1; |
| tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2; |
| } |
| if (x >= fp->steps_x && y >= fp->steps_y) { |
| uint8_t* srx = src - fp->steps_y * src_stride + x - fp->steps_x; |
| uint8_t* dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x; |
| |
| res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16); |
| *dsx = av_clip_uint8(res); |
| } |
| } |
| if (y >= 0) { |
| dst += dst_stride; |
| src += src_stride; |
| } |
| } |
| } |
| |
| static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount) |
| { |
| fp->msize_x = msize_x; |
| fp->msize_y = msize_y; |
| fp->amount = amount * 65536.0; |
| |
| fp->steps_x = msize_x / 2; |
| fp->steps_y = msize_y / 2; |
| fp->scalebits = (fp->steps_x + fp->steps_y) * 2; |
| fp->halfscale = 1 << (fp->scalebits - 1); |
| } |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
| { |
| UnsharpContext *unsharp = ctx->priv; |
| int lmsize_x = 5, cmsize_x = 0; |
| int lmsize_y = 5, cmsize_y = 0; |
| double lamount = 1.0f, camount = 0.0f; |
| |
| if (args) |
| sscanf(args, "%d:%d:%lf:%d:%d:%lf", &lmsize_x, &lmsize_y, &lamount, |
| &cmsize_x, &cmsize_y, &camount); |
| |
| set_filter_param(&unsharp->luma, lmsize_x, lmsize_y, lamount); |
| set_filter_param(&unsharp->chroma, cmsize_x, cmsize_y, camount); |
| |
| return 0; |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| enum PixelFormat pix_fmts[] = { |
| PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_YUV410P, |
| PIX_FMT_YUV411P, PIX_FMT_YUV440P, PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, |
| PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE |
| }; |
| |
| avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); |
| |
| return 0; |
| } |
| |
| static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width) |
| { |
| int z; |
| const char *effect; |
| |
| effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen"; |
| |
| av_log(ctx, AV_LOG_INFO, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n", |
| effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0); |
| |
| for (z = 0; z < 2 * fp->steps_y; z++) |
| fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x)); |
| } |
| |
| static int config_props(AVFilterLink *link) |
| { |
| UnsharpContext *unsharp = link->dst->priv; |
| |
| init_filter_param(link->dst, &unsharp->luma, "luma", link->w); |
| init_filter_param(link->dst, &unsharp->chroma, "chroma", CHROMA_WIDTH(link)); |
| |
| return 0; |
| } |
| |
| static void free_filter_param(FilterParam *fp) |
| { |
| int z; |
| |
| for (z = 0; z < 2 * fp->steps_y; z++) |
| av_free(fp->sc[z]); |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| UnsharpContext *unsharp = ctx->priv; |
| |
| free_filter_param(&unsharp->luma); |
| free_filter_param(&unsharp->chroma); |
| } |
| |
| static void end_frame(AVFilterLink *link) |
| { |
| UnsharpContext *unsharp = link->dst->priv; |
| AVFilterPicRef *in = link->cur_pic; |
| AVFilterPicRef *out = link->dst->outputs[0]->outpic; |
| |
| unsharpen(out->data[0], in->data[0], out->linesize[0], in->linesize[0], link->w, link->h, &unsharp->luma); |
| unsharpen(out->data[1], in->data[1], out->linesize[1], in->linesize[1], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma); |
| unsharpen(out->data[2], in->data[2], out->linesize[2], in->linesize[2], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma); |
| |
| avfilter_unref_pic(in); |
| avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1); |
| avfilter_end_frame(link->dst->outputs[0]); |
| avfilter_unref_pic(out); |
| } |
| |
| static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir) |
| { |
| } |
| |
| AVFilter avfilter_vf_unsharp = { |
| .name = "unsharp", |
| .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."), |
| |
| .priv_size = sizeof(UnsharpContext), |
| |
| .init = init, |
| .uninit = uninit, |
| .query_formats = query_formats, |
| |
| .inputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .draw_slice = draw_slice, |
| .end_frame = end_frame, |
| .config_props = config_props, |
| .min_perms = AV_PERM_READ, }, |
| { .name = NULL}}, |
| |
| .outputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, }, |
| { .name = NULL}}, |
| }; |