278 lines
9.5 KiB
C
278 lines
9.5 KiB
C
/*
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* Original copyright (c) 2002 Remi Guyomarch <rguyom@pobox.com>
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* Port copyright (c) 2010 Daniel G. Taylor <dan@programmer-art.org>
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* Relicensed to the LGPL with permission from Remi Guyomarch.
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* blur / sharpen filter, ported to Libav from MPlayer
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* libmpcodecs/unsharp.c.
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*
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* This code is based on:
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*
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* An Efficient algorithm for Gaussian blur using finite-state machines
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* Frederick M. Waltz and John W. V. Miller
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*
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* SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII
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* Originally published Boston, Nov 98
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*
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* http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf
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*/
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#include "libavutil/common.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#define MIN_SIZE 3
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#define MAX_SIZE 13
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typedef struct FilterParam {
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int msize_x; ///< matrix width
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int msize_y; ///< matrix height
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int amount; ///< effect amount
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int steps_x; ///< horizontal step count
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int steps_y; ///< vertical step count
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int scalebits; ///< bits to shift pixel
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int32_t halfscale; ///< amount to add to pixel
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uint32_t *sc[(MAX_SIZE * MAX_SIZE) - 1]; ///< finite state machine storage
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} FilterParam;
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typedef struct UnsharpContext {
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const AVClass *class;
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int lmsize_x, lmsize_y, cmsize_x, cmsize_y;
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float lamount, camount;
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FilterParam luma; ///< luma parameters (width, height, amount)
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FilterParam chroma; ///< chroma parameters (width, height, amount)
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int hsub, vsub;
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} UnsharpContext;
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static void apply_unsharp( uint8_t *dst, int dst_stride,
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const uint8_t *src, int src_stride,
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int width, int height, FilterParam *fp)
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{
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uint32_t **sc = fp->sc;
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uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2;
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int32_t res;
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int x, y, z;
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const uint8_t *src2;
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if (!fp->amount) {
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if (dst_stride == src_stride)
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memcpy(dst, src, src_stride * height);
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else
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for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
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memcpy(dst, src, width);
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return;
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}
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for (y = 0; y < 2 * fp->steps_y; y++)
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memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));
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for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
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if (y < height)
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src2 = src;
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memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
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for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
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tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
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for (z = 0; z < fp->steps_x * 2; z += 2) {
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tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
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tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
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}
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for (z = 0; z < fp->steps_y * 2; z += 2) {
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tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
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tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
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}
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if (x >= fp->steps_x && y >= fp->steps_y) {
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const uint8_t *srx = src - fp->steps_y * src_stride + x - fp->steps_x;
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uint8_t *dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x;
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res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
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*dsx = av_clip_uint8(res);
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}
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}
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if (y >= 0) {
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dst += dst_stride;
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src += src_stride;
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}
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}
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}
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static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, float amount)
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{
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fp->msize_x = msize_x;
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fp->msize_y = msize_y;
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fp->amount = amount * 65536.0;
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fp->steps_x = msize_x / 2;
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fp->steps_y = msize_y / 2;
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fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
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fp->halfscale = 1 << (fp->scalebits - 1);
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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UnsharpContext *unsharp = ctx->priv;
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set_filter_param(&unsharp->luma, unsharp->lmsize_x, unsharp->lmsize_y, unsharp->lamount);
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set_filter_param(&unsharp->chroma, unsharp->cmsize_x, unsharp->cmsize_y, unsharp->camount);
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
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{
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int z;
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const char *effect;
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effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
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av_log(ctx, AV_LOG_VERBOSE, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
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effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
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for (z = 0; z < 2 * fp->steps_y; z++)
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fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
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}
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static int config_props(AVFilterLink *link)
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{
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UnsharpContext *unsharp = link->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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unsharp->hsub = desc->log2_chroma_w;
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unsharp->vsub = desc->log2_chroma_h;
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init_filter_param(link->dst, &unsharp->luma, "luma", link->w);
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init_filter_param(link->dst, &unsharp->chroma, "chroma", AV_CEIL_RSHIFT(link->w, unsharp->hsub));
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return 0;
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}
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static void free_filter_param(FilterParam *fp)
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{
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int z;
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for (z = 0; z < 2 * fp->steps_y; z++)
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av_free(fp->sc[z]);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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UnsharpContext *unsharp = ctx->priv;
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free_filter_param(&unsharp->luma);
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free_filter_param(&unsharp->chroma);
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}
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static int filter_frame(AVFilterLink *link, AVFrame *in)
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{
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UnsharpContext *unsharp = link->dst->priv;
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AVFilterLink *outlink = link->dst->outputs[0];
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AVFrame *out;
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int cw = AV_CEIL_RSHIFT(link->w, unsharp->hsub);
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int ch = AV_CEIL_RSHIFT(link->h, unsharp->vsub);
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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apply_unsharp(out->data[0], out->linesize[0], in->data[0], in->linesize[0], link->w, link->h, &unsharp->luma);
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apply_unsharp(out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw, ch, &unsharp->chroma);
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apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw, ch, &unsharp->chroma);
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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#define OFFSET(x) offsetof(UnsharpContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption options[] = {
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{ "luma_msize_x", "luma matrix horizontal size", OFFSET(lmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
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{ "luma_msize_y", "luma matrix vertical size", OFFSET(lmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
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{ "luma_amount", "luma effect strength", OFFSET(lamount), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, -2, 5, FLAGS },
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{ "chroma_msize_x", "chroma matrix horizontal size", OFFSET(cmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
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{ "chroma_msize_y", "chroma matrix vertical size", OFFSET(cmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
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{ "chroma_amount", "chroma effect strength", OFFSET(camount), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -2, 5, FLAGS },
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{ NULL },
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};
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static const AVClass unsharp_class = {
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.class_name = "unsharp",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVFilterPad avfilter_vf_unsharp_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_props,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_unsharp_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_unsharp = {
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.name = "unsharp",
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.description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
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.priv_size = sizeof(UnsharpContext),
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.priv_class = &unsharp_class,
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = avfilter_vf_unsharp_inputs,
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.outputs = avfilter_vf_unsharp_outputs,
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};
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