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/*
* 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;
AVFilterBufferRef *in = link->cur_buf;
AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
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_buffer(in);
avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
avfilter_end_frame(link->dst->outputs[0]);
avfilter_unref_buffer(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}},
};
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